Merge branch 'migrate_lmdb' into update_lmdb

Cargo.toml

@@ -41,10 +41,10 @@ grin_wallet_util = { path = "./util", version = "5.4.0-alpha.1" }
 ##### Grin Imports
 
 # For Release
-grin_core = "5.4.0"
-grin_keychain = "5.4.0"
-grin_util = "5.4.0"
-grin_api = "5.4.0"
+#grin_core = "5.4.0"
+#grin_keychain = "5.4.0"
+#grin_util = "5.4.0"
+#grin_api = "5.4.0"
 
 # For beta release
 
@@ -54,10 +54,10 @@ grin_api = "5.4.0"
 # grin_api = { git = "https://github.com/mimblewimble/grin", tag = "v5.2.0-beta.3" }
 
 # For bleeding edge
-# grin_core = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_keychain = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_util = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_api = { git = "https://github.com/mimblewimble/grin", branch = "master" }
+grin_core = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_keychain = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_util = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_api = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
 
 # For local testing
 # grin_core = { path = "../grin/core"}

api/Cargo.toml

@@ -30,9 +30,9 @@ grin_wallet_util = { path = "../util", version = "5.4.0-alpha.1" }
 ##### Grin Imports
 
 # For Release
-grin_core = "5.4.0"
-grin_keychain = "5.4.0"
-grin_util = "5.4.0"
+#grin_core = "5.4.0"
+#grin_keychain = "5.4.0"
+#grin_util = "5.4.0"
 
 # For beta release
 
@@ -41,9 +41,9 @@ grin_util = "5.4.0"
 # grin_util = { git = "https://github.com/mimblewimble/grin", tag = "v5.2.0-beta.3" }
 
 # For bleeding edge
-# grin_core = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_keychain = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_util = { git = "https://github.com/mimblewimble/grin", branch = "master" }
+grin_core = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_keychain = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_util = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
 
 # For local testing
 # grin_core = { path = "../../grin/core"}

api/src/foreign.rs

@@ -146,7 +146,7 @@ where
 	/// // by the reference wallet implementation.
 	/// // These traits can be replaced with alternative implementations if desired
 	///
-	/// let mut wallet = Box::new(DefaultWalletImpl::<'static, HTTPNodeClient>::new(node_client.clone()).unwrap())
+	/// let mut wallet = Box::new(DefaultWalletImpl::<HTTPNodeClient>::new(node_client.clone()).unwrap())
 	///     as Box<dyn WalletInst<'static, DefaultLCProvider<HTTPNodeClient, ExtKeychain>, HTTPNodeClient, ExtKeychain>>;
 	///
 	/// // Wallet LifeCycle Provider provides all functions init wallet and work with seeds, etc...
@@ -286,7 +286,7 @@ where
 			)?;
 		}
 		foreign::build_coinbase(
-			&mut **w,
+			w,
 			(&self.keychain_mask).as_ref(),
 			block_fees,
 			self.doctest_mode,
@@ -362,7 +362,7 @@ where
 			)?;
 		}
 		let ret_slate = foreign::receive_tx(
-			&mut **w,
+			w,
 			(&self.keychain_mask).as_ref(),
 			slate,
 			dest_acct_name,
@@ -380,8 +380,8 @@ where
 					self.doctest_mode,
 				);
 				match res {
-					Ok(s) => return Ok(s.unwrap()),
-					Err(_) => return Ok(ret_slate),
+					Ok(s) => Ok(s.unwrap()),
+					Err(_) => Ok(ret_slate),
 				}
 			}
 			None => Ok(ret_slate),
@@ -443,12 +443,7 @@ where
 			true => false,
 			false => post_automatically,
 		};
-		foreign::finalize_tx(
-			&mut **w,
-			(&self.keychain_mask).as_ref(),
-			slate,
-			post_automatically,
-		)
+		foreign::finalize_tx(w, (&self.keychain_mask).as_ref(), slate, post_automatically)
 	}
 }
 
@@ -496,17 +491,16 @@ macro_rules! doctest_helper_setup_doc_env_foreign {
 
 		let node_client =
 			HTTPNodeClient::new(&wallet_config.check_node_api_http_addr, None).unwrap();
-		let mut wallet = Box::new(
-			DefaultWalletImpl::<'static, HTTPNodeClient>::new(node_client.clone()).unwrap(),
-		)
-			as Box<
-				dyn WalletInst<
-					'static,
-					DefaultLCProvider<HTTPNodeClient, ExtKeychain>,
-					HTTPNodeClient,
-					ExtKeychain,
-				>,
-			>;
+		let mut wallet =
+			Box::new(DefaultWalletImpl::<HTTPNodeClient>::new(node_client.clone()).unwrap())
+				as Box<
+					dyn WalletInst<
+						'static,
+						DefaultLCProvider<HTTPNodeClient, ExtKeychain>,
+						HTTPNodeClient,
+						ExtKeychain,
+					>,
+				>;
 		let lc = wallet.lc_provider().unwrap();
 		let _ = lc.set_top_level_directory(&wallet_config.data_file_dir);
 		lc.open_wallet(None, pw, false, false);

api/src/foreign_rpc.rs

@@ -381,7 +381,6 @@ pub fn run_doctest_foreign(
 		Box::new(DefaultWalletImpl::<LocalWalletClient>::new(client1.clone()).unwrap())
 			as Box<
 				dyn WalletInst<
-					'static,
 					DefaultLCProvider<LocalWalletClient, ExtKeychain>,
 					LocalWalletClient,
 					ExtKeychain,
@@ -416,7 +415,6 @@ pub fn run_doctest_foreign(
 		Box::new(DefaultWalletImpl::<LocalWalletClient>::new(client2.clone()).unwrap())
 			as Box<
 				dyn WalletInst<
-					'static,
 					DefaultLCProvider<LocalWalletClient, ExtKeychain>,
 					LocalWalletClient,
 					ExtKeychain,
@@ -473,7 +471,7 @@ pub fn run_doctest_foreign(
 				amount,
 				..Default::default()
 			};
-			api_impl::owner::issue_invoice_tx(&mut **w, (&mask2).as_ref(), args, true).unwrap()
+			api_impl::owner::issue_invoice_tx(w, (&mask2).as_ref(), args, true).unwrap()
 		};
 		slate = {
 			let mut w_lock = wallet1.lock();
@@ -487,8 +485,7 @@ pub fn run_doctest_foreign(
 				selection_strategy_is_use_all: true,
 				..Default::default()
 			};
-			api_impl::owner::process_invoice_tx(&mut **w, (&mask1).as_ref(), &slate, args, true)
-				.unwrap()
+			api_impl::owner::process_invoice_tx(w, (&mask1).as_ref(), &slate, args, true).unwrap()
 		};
 		println!("INIT INVOICE SLATE");
 		// Spit out slate for input to finalize_tx
@@ -508,7 +505,7 @@ pub fn run_doctest_foreign(
 			selection_strategy_is_use_all: true,
 			..Default::default()
 		};
-		let slate = api_impl::owner::init_send_tx(&mut **w, (&mask1).as_ref(), args, true).unwrap();
+		let slate = api_impl::owner::init_send_tx(w, (&mask1).as_ref(), args, true).unwrap();
 		println!("INIT SLATE");
 		// Spit out slate for input to finalize_tx
 		println!("{}", serde_json::to_string_pretty(&slate).unwrap());

api/src/owner.rs

@@ -97,7 +97,7 @@ where
 	///
 	/// Each method will call the [`WalletBackend`](../grin_wallet_libwallet/types/trait.WalletBackend.html)'s
 	/// [`open_with_credentials`](../grin_wallet_libwallet/types/trait.WalletBackend.html#tymethod.open_with_credentials)
-	/// (initialising a keychain with the master seed,) perform its operation, then close the keychain
+	/// initializing a keychain with the master seed, perform its operation, then close the keychain
 	/// with a call to [`close`](../grin_wallet_libwallet/types/trait.WalletBackend.html#tymethod.close)
 	///
 	/// # Arguments
@@ -147,11 +147,11 @@ where
 	/// let node_client = HTTPNodeClient::new(&wallet_config.check_node_api_http_addr, None).unwrap();
 	///
 	/// // impls::DefaultWalletImpl is provided for convenience in instantiating the wallet
-	/// // It contains the LMDBBackend, DefaultLCProvider (lifecycle) and ExtKeychain used
+	/// // It contains the WalletBackend, DefaultLCProvider (lifecycle) and ExtKeychain used
 	/// // by the reference wallet implementation.
 	/// // These traits can be replaced with alternative implementations if desired
 	///
-	/// let mut wallet = Box::new(DefaultWalletImpl::<'static, HTTPNodeClient>::new(node_client.clone()).unwrap())
+	/// let mut wallet = Box::new(DefaultWalletImpl::<HTTPNodeClient>::new(node_client.clone()).unwrap())
 	///     as Box<dyn WalletInst<'static, DefaultLCProvider<HTTPNodeClient, ExtKeychain>, HTTPNodeClient, ExtKeychain>>;
 	///
 	/// // Wallet LifeCycle Provider provides all functions init wallet and work with seeds, etc...
@@ -258,7 +258,7 @@ where
 		let w = w_lock.lc_provider()?.wallet_inst()?;
 		// Test keychain mask, to keep API consistent
 		let _ = w.keychain(keychain_mask)?;
-		owner::accounts(&mut **w)
+		owner::accounts(w)
 	}
 
 	/// Creates a new 'account', which is a mapping of a user-specified
@@ -308,7 +308,7 @@ where
 	) -> Result<Identifier, Error> {
 		let mut w_lock = self.wallet_inst.lock();
 		let w = w_lock.lc_provider()?.wallet_inst()?;
-		owner::create_account_path(&mut **w, keychain_mask, label)
+		owner::create_account_path(w, keychain_mask, label)
 	}
 
 	/// Sets the wallet's currently active account. This sets the
@@ -358,7 +358,7 @@ where
 		let w = w_lock.lc_provider()?.wallet_inst()?;
 		// Test keychain mask, to keep API consistent
 		let _ = w.keychain(keychain_mask)?;
-		owner::set_active_account(&mut **w, label)
+		owner::set_active_account(w, label)
 	}
 
 	/// Returns a list of outputs from the active account in the wallet.
@@ -665,7 +665,7 @@ where
 		let slate = {
 			let mut w_lock = self.wallet_inst.lock();
 			let w = w_lock.lc_provider()?.wallet_inst()?;
-			owner::init_send_tx(&mut **w, keychain_mask, args, self.doctest_mode)?
+			owner::init_send_tx(w, keychain_mask, args, self.doctest_mode)?
 		};
 		// Helper functionality. If send arguments exist, attempt to send sync and
 		// finalize
@@ -701,17 +701,17 @@ where
 							match result {
 								Ok(_) => {
 									info!("Tx sent ok",);
-									return Ok(ret_slate);
+									Ok(ret_slate)
 								}
 								Err(e) => {
 									error!("Tx sent fail: {}", e);
-									return Err(e);
+									Err(e)
 								}
 							}
 						} else {
 							self.tx_lock_outputs(keychain_mask, &s)?;
 							let ret_slate = self.finalize_tx(keychain_mask, &s)?;
-							return Ok(ret_slate);
+							Ok(ret_slate)
 						}
 					}
 					Ok(None) => Ok(slate),
@@ -724,7 +724,7 @@ where
 
 	/// Issues a new invoice transaction slate, essentially a `request for payment`.
 	/// The slate created by this function will contain the amount, an output for the amount,
-	/// as well as round 1 of singature creation complete. The slate should then be send
+	/// as well as round 1 of signature creation complete. The slate should then be sent
 	/// to the payer, who should add their inputs and signature data and return the slate
 	/// via the [Foreign API's `finalize_tx`](struct.Foreign.html#method.finalize_tx) method.
 	///
@@ -764,14 +764,14 @@ where
 	) -> Result<Slate, Error> {
 		let mut w_lock = self.wallet_inst.lock();
 		let w = w_lock.lc_provider()?.wallet_inst()?;
-		owner::issue_invoice_tx(&mut **w, keychain_mask, args, self.doctest_mode)
+		owner::issue_invoice_tx(w, keychain_mask, args, self.doctest_mode)
 	}
 
-	/// Processes an invoice tranaction created by another party, essentially
+	/// Processes an invoice transaction created by another party, essentially
 	/// a `request for payment`. The incoming slate should contain a requested
-	/// amount, an output created by the invoicer convering the amount, and
+	/// amount, an output created by the invoicer converting the amount, and
 	/// part 1 of signature creation completed. This function will add inputs
-	/// equalling the amount + fees, as well as perform round 1 and 2 of signature
+	/// equaling the amount + fees, as well as perform round 1 and 2 of signature
 	/// creation.
 	///
 	/// Callers should note that no prompting of the user will be done by this function
@@ -837,8 +837,7 @@ where
 		let mut w_lock = self.wallet_inst.lock();
 		let w = w_lock.lc_provider()?.wallet_inst()?;
 		let send_args = args.send_args.clone();
-		let slate =
-			owner::process_invoice_tx(&mut **w, keychain_mask, slate, args, self.doctest_mode)?;
+		let slate = owner::process_invoice_tx(w, keychain_mask, slate, args, self.doctest_mode)?;
 		// Helper functionality. If send arguments exist, attempt to send
 		match send_args {
 			Some(sa) => {
@@ -871,7 +870,7 @@ where
 	/// Locks the outputs associated with the inputs to the transaction in the given
 	/// [`Slate`](../grin_wallet_libwallet/slate/struct.Slate.html),
 	/// making them unavailable for use in further transactions. This function is called
-	/// by the sender, (or more generally, all parties who have put inputs into the transaction,)
+	/// by the sender, (or more generally, all parties who have put inputs into the transaction)
 	/// and must be called before the corresponding call to [`finalize_tx`](struct.Owner.html#method.finalize_tx)
 	/// that completes the transaction.
 	///
@@ -929,7 +928,7 @@ where
 	) -> Result<(), Error> {
 		let mut w_lock = self.wallet_inst.lock();
 		let w = w_lock.lc_provider()?.wallet_inst()?;
-		owner::tx_lock_outputs(&mut **w, keychain_mask, slate)
+		owner::tx_lock_outputs(w, keychain_mask, slate)
 	}
 
 	/// Finalizes a transaction, after all parties
@@ -995,7 +994,7 @@ where
 	) -> Result<Slate, Error> {
 		let mut w_lock = self.wallet_inst.lock();
 		let w = w_lock.lc_provider()?.wallet_inst()?;
-		owner::finalize_tx(&mut **w, keychain_mask, slate)
+		owner::finalize_tx(w, keychain_mask, slate)
 	}
 
 	/// Posts a completed transaction to the listening node for validation and inclusion in a block
@@ -1186,7 +1185,7 @@ where
 		let w = w_lock.lc_provider()?.wallet_inst()?;
 		// Test keychain mask, to keep API consistent
 		let _ = w.keychain(keychain_mask)?;
-		owner::get_stored_tx(&**w, tx_id, slate_id)
+		owner::get_stored_tx(w, tx_id, slate_id)
 	}
 
 	/// Return the rewind hash of the wallet.
@@ -2422,7 +2421,7 @@ where
 	) -> Result<BuiltOutput, Error> {
 		let mut w_lock = self.wallet_inst.lock();
 		let w = w_lock.lc_provider()?.wallet_inst()?;
-		owner::build_output(&mut **w, keychain_mask, features, amount)
+		owner::build_output(w, keychain_mask, features, amount)
 	}
 
 	// MWIXNET
@@ -2481,7 +2480,7 @@ where
 		let mut w_lock = self.wallet_inst.lock();
 		let w = w_lock.lc_provider()?.wallet_inst()?;
 		owner::create_mwixnet_req(
-			&mut **w,
+			w,
 			keychain_mask,
 			params,
 			commitment,
@@ -2499,7 +2498,7 @@ pub fn try_slatepack_sync_workflow(
 	tor_sender: Option<HttpSlateSender>,
 	send_to_finalize: bool,
 	test_mode: bool,
-) -> Result<Option<Slate>, libwallet::Error> {
+) -> Result<Option<Slate>, Error> {
 	if let Some(tc) = &tor_config {
 		if tc.skip_send_attempt == Some(true) {
 			return Ok(None);
@@ -2604,7 +2603,7 @@ macro_rules! doctest_helper_setup_doc_env {
 
 		use uuid::Uuid;
 
-		// don't run on windows CI, which gives very inconsistent results
+		// don't run on Windows CI, which gives very inconsistent results
 		if cfg!(windows) {
 			return;
 		}
@@ -2624,17 +2623,16 @@ macro_rules! doctest_helper_setup_doc_env {
 
 		let node_client =
 			HTTPNodeClient::new(&wallet_config.check_node_api_http_addr, None).unwrap();
-		let mut wallet = Box::new(
-			DefaultWalletImpl::<'static, HTTPNodeClient>::new(node_client.clone()).unwrap(),
-		)
-			as Box<
-				dyn WalletInst<
-					'static,
-					DefaultLCProvider<HTTPNodeClient, ExtKeychain>,
-					HTTPNodeClient,
-					ExtKeychain,
-				>,
-			>;
+		let mut wallet =
+			Box::new(DefaultWalletImpl::<HTTPNodeClient>::new(node_client.clone()).unwrap())
+				as Box<
+					dyn WalletInst<
+						'static,
+						DefaultLCProvider<HTTPNodeClient, ExtKeychain>,
+						HTTPNodeClient,
+						ExtKeychain,
+					>,
+				>;
 		let lc = wallet.lc_provider().unwrap();
 		let _ = lc.set_top_level_directory(&wallet_config.data_file_dir);
 		lc.open_wallet(None, pw, false, false);

api/src/owner_rpc.rs

@@ -2137,6 +2137,14 @@ where
 		VersionedSlate::into_version(out_slate, version)
 	}
 
+	fn tx_lock_outputs(&self, token: Token, in_slate: VersionedSlate) -> Result<(), Error> {
+		Owner::tx_lock_outputs(
+			self,
+			(&token.keychain_mask).as_ref(),
+			&Slate::from(in_slate),
+		)
+	}
+
 	fn finalize_tx(&self, token: Token, in_slate: VersionedSlate) -> Result<VersionedSlate, Error> {
 		let out_slate = Owner::finalize_tx(
 			self,
@@ -2147,11 +2155,12 @@ where
 		VersionedSlate::into_version(out_slate, version)
 	}
 
-	fn tx_lock_outputs(&self, token: Token, in_slate: VersionedSlate) -> Result<(), Error> {
-		Owner::tx_lock_outputs(
+	fn post_tx(&self, token: Token, slate: VersionedSlate, fluff: bool) -> Result<(), Error> {
+		Owner::post_tx(
 			self,
 			(&token.keychain_mask).as_ref(),
-			&Slate::from(in_slate),
+			&Slate::from(slate),
+			fluff,
 		)
 	}
 
@@ -2185,15 +2194,6 @@ where
 		}
 	}
 
-	fn post_tx(&self, token: Token, slate: VersionedSlate, fluff: bool) -> Result<(), Error> {
-		Owner::post_tx(
-			self,
-			(&token.keychain_mask).as_ref(),
-			&Slate::from(slate),
-			fluff,
-		)
-	}
-
 	fn get_rewind_hash(&self, token: Token) -> Result<String, Error> {
 		Owner::get_rewind_hash(self, (&token.keychain_mask).as_ref())
 	}
@@ -2625,26 +2625,25 @@ pub fn run_doctest_owner(
 			payment_proof_recipient_address: proof_address,
 			..Default::default()
 		};
-		let mut slate =
-			api_impl::owner::init_send_tx(&mut **w, (&mask1).as_ref(), args, true).unwrap();
+		let mut slate = api_impl::owner::init_send_tx(w, (&mask1).as_ref(), args, true).unwrap();
 		println!("INITIAL SLATE");
 		println!("{}", serde_json::to_string_pretty(&slate).unwrap());
 		{
 			let mut w_lock = wallet2.lock();
 			let w2 = w_lock.lc_provider().unwrap().wallet_inst().unwrap();
-			slate = api_impl::foreign::receive_tx(&mut **w2, (&mask2).as_ref(), &slate, None, true)
-				.unwrap();
+			slate =
+				api_impl::foreign::receive_tx(w2, (&mask2).as_ref(), &slate, None, true).unwrap();
 			w2.close().unwrap();
 		}
 		// Spit out slate for input to finalize_tx
 		if lock_tx {
 			println!("LOCKING TX");
-			api_impl::owner::tx_lock_outputs(&mut **w, (&mask1).as_ref(), &slate).unwrap();
+			api_impl::owner::tx_lock_outputs(w, (&mask1).as_ref(), &slate).unwrap();
 		}
 		println!("RECEIPIENT SLATE");
 		println!("{}", serde_json::to_string_pretty(&slate).unwrap());
 		if finalize_tx {
-			slate = api_impl::owner::finalize_tx(&mut **w, (&mask1).as_ref(), &slate).unwrap();
+			slate = api_impl::owner::finalize_tx(w, (&mask1).as_ref(), &slate).unwrap();
 			error!("FINALIZED TX SLATE");
 			println!("{}", serde_json::to_string_pretty(&slate).unwrap());
 		}

config/Cargo.toml

@@ -21,8 +21,8 @@ grin_wallet_util = { path = "../util", version = "5.4.0-alpha.1" }
 ##### Grin Imports
 
 # For Release
-grin_core = "5.4.0"
-grin_util = "5.4.0"
+#grin_core = "5.4.0"
+#grin_util = "5.4.0"
 
 # For beta release
 
@@ -30,8 +30,8 @@ grin_util = "5.4.0"
 #grin_util = { git = "https://github.com/mimblewimble/grin", tag = "v5.2.0-beta.3" }
 
 # For bleeding edge
-# grin_core = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_util = { git = "https://github.com/mimblewimble/grin", branch = "master" }
+grin_core = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_util = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
 
 # For local testing
 # grin_core = { path = "../../grin/core"}

controller/Cargo.toml

@@ -39,10 +39,11 @@ grin_wallet_config = { path = "../config", version = "5.4.0-alpha.1" }
 ##### Grin Imports
 
 # For Release
-grin_core = "5.4.0"
-grin_keychain = "5.4.0"
-grin_util = "5.4.0"
-grin_api = "5.4.0"
+#grin_core = "5.4.0"
+#grin_keychain = "5.4.0"
+#grin_util = "5.4.0"
+#grin_api = "5.4.0"
+#grin_chain = "5.4.0"
 
 # For beta release
 
@@ -50,39 +51,24 @@ grin_api = "5.4.0"
 # grin_keychain = { git = "https://github.com/mimblewimble/grin", tag = "v5.2.0-beta.3" }
 # grin_util = { git = "https://github.com/mimblewimble/grin", tag = "v5.2.0-beta.3" }
 # grin_api = { git = "https://github.com/mimblewimble/grin", tag = "v5.2.0-beta.3" }
+# grin_chain = { git = "https://github.com/mimblewimble/grin", tag = "v5.2.0-beta.3" }
 
 # For bleeding edge
-# grin_core = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_keychain = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_util = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_api = { git = "https://github.com/mimblewimble/grin", branch = "master" }
+grin_core = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_keychain = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_util = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_api = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_chain = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
 
 # For local testing
 # grin_core = { path = "../../grin/core"}
 # grin_keychain = { path = "../../grin/keychain"}
 # grin_util = { path = "../../grin/util"}
 # grin_api = { path = "../../grin/api"}
+# grin_chain = { path = "../../grin/chain"}
 
 #####
 
 [dev-dependencies]
 ed25519-dalek = "1.0.0-pre.4"
 remove_dir_all = "0.7"
-
-##### Grin Imports
-
-# For Release
-grin_chain = "5.4.0"
-
-# For beta release
-
-# grin_chain = { git = "https://github.com/mimblewimble/grin", tag = "v5.2.0-beta.3" }
-
-# For bleeding edge
-# grin_chain = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-
-# For local testing
-# grin_chain = { path = "../../grin/chain"}
-
-##### 
-

controller/tests/common/mod.rs

@@ -98,7 +98,7 @@ pub fn create_wallet_proxy(
 	test_dir: &str,
 ) -> WalletProxy<
 	'_,
-	DefaultLCProvider<'_, LocalWalletClient, ExtKeychain>,
+	DefaultLCProvider<LocalWalletClient, ExtKeychain>,
 	LocalWalletClient,
 	ExtKeychain,
 > {
@@ -117,7 +117,7 @@ pub fn create_local_wallet(
 			Box<
 				dyn WalletInst<
 					'static,
-					DefaultLCProvider<'static, LocalWalletClient, ExtKeychain>,
+					DefaultLCProvider<LocalWalletClient, ExtKeychain>,
 					LocalWalletClient,
 					ExtKeychain,
 				>,
@@ -129,7 +129,7 @@ pub fn create_local_wallet(
 	let mut wallet = Box::new(DefaultWalletImpl::<LocalWalletClient>::new(client).unwrap())
 		as Box<
 			dyn WalletInst<
-				DefaultLCProvider<'static, LocalWalletClient, ExtKeychain>,
+				DefaultLCProvider<LocalWalletClient, ExtKeychain>,
 				LocalWalletClient,
 				ExtKeychain,
 			>,
@@ -156,7 +156,7 @@ pub fn open_local_wallet(
 			Box<
 				dyn WalletInst<
 					'static,
-					DefaultLCProvider<'static, LocalWalletClient, ExtKeychain>,
+					DefaultLCProvider<LocalWalletClient, ExtKeychain>,
 					LocalWalletClient,
 					ExtKeychain,
 				>,
@@ -168,7 +168,7 @@ pub fn open_local_wallet(
 	let mut wallet = Box::new(DefaultWalletImpl::<LocalWalletClient>::new(client).unwrap())
 		as Box<
 			dyn WalletInst<
-				DefaultLCProvider<'static, LocalWalletClient, ExtKeychain>,
+				DefaultLCProvider<LocalWalletClient, ExtKeychain>,
 				LocalWalletClient,
 				ExtKeychain,
 			>,

controller/tests/revert.rs

@@ -41,7 +41,7 @@ type Wallet = Arc<
 		Box<
 			dyn WalletInst<
 				'static,
-				DefaultLCProvider<'static, LocalWalletClient, ExtKeychain>,
+				DefaultLCProvider<LocalWalletClient, ExtKeychain>,
 				LocalWalletClient,
 				ExtKeychain,
 			>,

controller/tests/tx_list_filter.rs

@@ -45,7 +45,7 @@ fn test_wallet_tx_filtering(
 			Box<
 				dyn WalletInst<
 					'static,
-					DefaultLCProvider<'static, LocalWalletClient, ExtKeychain>,
+					DefaultLCProvider<LocalWalletClient, ExtKeychain>,
 					LocalWalletClient,
 					ExtKeychain,
 				>,

doc/design/design.md

@@ -55,24 +55,22 @@ the default client only supports single-user - single recipient, an arbitrary nu
 
 ### Wallet Traits
 
-In the current code, a Wallet implementation is just a combination of these three traits. The vast majority of functions within libwallet
+In the current code, a Wallet implementation is just a combination of these two traits. The vast majority of functions within libwallet
 and libTX have a signature similar to the following:
 
 ```rust
 pub fn retrieve_outputs<T: ?Sized, C, K>(
-!·wallet: &mut T,
+!·wallet: &mut WalletBackend<C, K>,
 !·show_spent: bool,
 !·tx_id: Option<u32>,
 ) -> Result<Vec<OutputData>, Error>
 where
-!·T: WalletBackend<C, K>,
 !·C: NodeClient,
 !·K: Keychain,
 {  
 ```
 
-With `T` in this instance being a class that implements  the `WalletBackend` trait, which is further parameterized with implementations of
-`NodeClient` and `Keychain`.
+Provided `WalletBackend` parameterized with implementations of `NodeClient` and `Keychain`.
 
 There is currently only a single implementation of the Keychain trait within the Grin code, in the `keychain` crate exported as `ExtKeyChain`.
 The `Keychain` trait makes several assumptions about the underlying implementation, particularly that it will adhere to a
@@ -81,9 +79,4 @@ The `Keychain` trait makes several assumptions about the underlying implementati
 There are two implementations of `NodeClient` within the code, the main version being the `HTTPNodeClient` found within `wallet/src/client.rs` and
 the seconds a test client that communicates with an in-process instance of a chain. The NodeClient isolates all network calls, so upgrading wallet
 communication from the current simple http interaction to a more secure protocol (or allowing for many options) should be a simple
-matter of dropping in different `NodeClient` implementations.
-
-There are also two implementations of `WalletBackend` within the code at the base of the `wallet` crate. `LMDBBackend` found within
-`wallet/src/lmdb_wallet.rs` is the main implementation, and is now used by all grin wallet commands. The earlier `FileWallet` still exists
-within the code, however it is not invoked, and given there are no real advantages to running it over a DB implementation, development on it
-has been dropped in favour of the LMDB implementation.
+matter of dropping in different `NodeClient` implementations.

impls/Cargo.toml

@@ -43,12 +43,12 @@ grin_wallet_libwallet = { path = "../libwallet", version = "5.4.0-alpha.1" }
 ##### Grin Imports
 
 # For Release
-grin_core = "5.4.0"
-grin_keychain = "5.4.0"
-grin_chain = "5.4.0"
-grin_util = "5.4.0"
-grin_api = "5.4.0"
-grin_store = "5.4.0"
+#grin_core = "5.4.0"
+#grin_keychain = "5.4.0"
+#grin_chain = "5.4.0"
+#grin_util = "5.4.0"
+#grin_api = "5.4.0"
+#grin_store = "5.4.0"
 
 # For beta release
 
@@ -60,12 +60,12 @@ grin_store = "5.4.0"
 # grin_store = { git = "https://github.com/mimblewimble/grin", tag = "v5.2.0-beta.3" }
 
 # For bleeding edge
-# grin_core = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_keychain = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_chain = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_util = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_api = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_store = { git = "https://github.com/mimblewimble/grin", branch = "master" }
+grin_core = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_keychain = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_chain = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_util = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_api = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_store = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
 
 # For local testing
 # grin_core = { path = "../../grin/core"}

impls/src/backends/lmdb.rs

@@ -1,777 +0,0 @@
-// Copyright 2021 The Grin Developers
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-use std::cell::RefCell;
-use std::{fs, path};
-
-// for writing stored transaction files
-use std::fs::File;
-use std::io::{Read, Write};
-use std::marker::PhantomData;
-use std::path::Path;
-
-use uuid::Uuid;
-
-use crate::blake2::blake2b::{Blake2b, Blake2bResult};
-
-use crate::keychain::{ChildNumber, ExtKeychain, Identifier, Keychain, SwitchCommitmentType};
-use crate::store::{self, option_to_not_found, to_key, to_key_u64};
-
-use crate::core::core::Transaction;
-use crate::core::ser;
-use crate::libwallet::{
-	AcctPathMapping, Context, Error, NodeClient, OutputData, ScannedBlockInfo, TxLogEntry,
-	WalletBackend, WalletInitStatus, WalletOutputBatch,
-};
-use crate::util::secp::constants::SECRET_KEY_SIZE;
-use crate::util::secp::key::SecretKey;
-use crate::util::{self, secp, ToHex};
-
-use rand::rngs::mock::StepRng;
-use rand::thread_rng;
-
-pub const DB_DIR: &str = "db";
-pub const TX_SAVE_DIR: &str = "saved_txs";
-
-const OUTPUT_PREFIX: u8 = b'o';
-const DERIV_PREFIX: u8 = b'd';
-const CONFIRMED_HEIGHT_PREFIX: u8 = b'c';
-const PRIVATE_TX_CONTEXT_PREFIX: u8 = b'p';
-const TX_LOG_ENTRY_PREFIX: u8 = b't';
-const TX_LOG_ID_PREFIX: u8 = b'i';
-const ACCOUNT_PATH_MAPPING_PREFIX: u8 = b'a';
-const LAST_SCANNED_BLOCK: u8 = b'l';
-const LAST_SCANNED_KEY: &str = "LAST_SCANNED_KEY";
-const WALLET_INIT_STATUS: u8 = b'w';
-const WALLET_INIT_STATUS_KEY: &str = "WALLET_INIT_STATUS";
-
-/// test to see if database files exist in the current directory. If so,
-/// use a DB backend for all operations
-pub fn wallet_db_exists(data_file_dir: &str) -> bool {
-	let db_path = path::Path::new(data_file_dir).join(DB_DIR);
-	db_path.exists()
-}
-
-/// Helper to derive XOR keys for storing private transaction keys in the DB
-/// (blind_xor_key, nonce_xor_key)
-fn private_ctx_xor_keys<K>(
-	keychain: &K,
-	slate_id: &[u8],
-) -> Result<([u8; SECRET_KEY_SIZE], [u8; SECRET_KEY_SIZE]), Error>
-where
-	K: Keychain,
-{
-	let root_key = keychain.derive_key(0, &K::root_key_id(), SwitchCommitmentType::Regular)?;
-
-	// derive XOR values for storing secret values in DB
-	// h(root_key|slate_id|"blind")
-	let mut hasher = Blake2b::new(SECRET_KEY_SIZE);
-	hasher.update(&root_key.0[..]);
-	hasher.update(&slate_id[..]);
-	hasher.update(&b"blind"[..]);
-	let blind_xor_key = hasher.finalize();
-	let mut ret_blind = [0; SECRET_KEY_SIZE];
-	ret_blind.copy_from_slice(&blind_xor_key.as_bytes()[0..SECRET_KEY_SIZE]);
-
-	// h(root_key|slate_id|"nonce")
-	let mut hasher = Blake2b::new(SECRET_KEY_SIZE);
-	hasher.update(&root_key.0[..]);
-	hasher.update(&slate_id[..]);
-	hasher.update(&b"nonce"[..]);
-	let nonce_xor_key = hasher.finalize();
-	let mut ret_nonce = [0; SECRET_KEY_SIZE];
-	ret_nonce.copy_from_slice(&nonce_xor_key.as_bytes()[0..SECRET_KEY_SIZE]);
-
-	Ok((ret_blind, ret_nonce))
-}
-
-pub struct LMDBBackend<'ck, C, K>
-where
-	C: NodeClient + 'ck,
-	K: Keychain + 'ck,
-{
-	db: store::Store,
-	data_file_dir: String,
-	/// Keychain
-	pub keychain: Option<K>,
-	/// Check value for XORed keychain seed
-	pub master_checksum: Box<Option<Blake2bResult>>,
-	/// Parent path to use by default for output operations
-	parent_key_id: Identifier,
-	/// wallet to node client
-	w2n_client: C,
-	///phantom
-	_phantom: &'ck PhantomData<C>,
-}
-
-impl<'ck, C, K> LMDBBackend<'ck, C, K>
-where
-	C: NodeClient + 'ck,
-	K: Keychain + 'ck,
-{
-	pub fn new(data_file_dir: &str, n_client: C) -> Result<Self, Error> {
-		let db_path = path::Path::new(data_file_dir).join(DB_DIR);
-		fs::create_dir_all(&db_path).expect("Couldn't create wallet backend directory!");
-
-		let stored_tx_path = path::Path::new(data_file_dir).join(TX_SAVE_DIR);
-		fs::create_dir_all(&stored_tx_path)
-			.expect("Couldn't create wallet backend tx storage directory!");
-
-		let store = store::Store::new(db_path.to_str().unwrap(), None, Some(DB_DIR), None)?;
-
-		// Make sure default wallet derivation path always exists
-		// as well as path (so it can be retrieved by batches to know where to store
-		// completed transactions, for reference
-		let default_account = AcctPathMapping {
-			label: "default".to_owned(),
-			path: LMDBBackend::<C, K>::default_path(),
-		};
-		let acct_key = to_key(
-			ACCOUNT_PATH_MAPPING_PREFIX,
-			&mut default_account.label.as_bytes().to_vec(),
-		);
-
-		{
-			let batch = store.batch()?;
-			batch.put_ser(&acct_key, &default_account)?;
-			batch.commit()?;
-		}
-
-		let res = LMDBBackend {
-			db: store,
-			data_file_dir: data_file_dir.to_owned(),
-			keychain: None,
-			master_checksum: Box::new(None),
-			parent_key_id: LMDBBackend::<C, K>::default_path(),
-			w2n_client: n_client,
-			_phantom: &PhantomData,
-		};
-		Ok(res)
-	}
-
-	fn default_path() -> Identifier {
-		// return the default parent wallet path, corresponding to the default account
-		// in the BIP32 spec. Parent is account 0 at level 2, child output identifiers
-		// are all at level 3
-		ExtKeychain::derive_key_id(2, 0, 0, 0, 0)
-	}
-
-	/// Just test to see if database files exist in the current directory. If
-	/// so, use a DB backend for all operations
-	pub fn exists(data_file_dir: &str) -> bool {
-		let db_path = path::Path::new(data_file_dir).join(DB_DIR);
-		db_path.exists()
-	}
-}
-
-impl<'ck, C, K> WalletBackend<'ck, C, K> for LMDBBackend<'ck, C, K>
-where
-	C: NodeClient + 'ck,
-	K: Keychain + 'ck,
-{
-	/// Set the keychain, which should already have been opened
-	fn set_keychain(
-		&mut self,
-		mut k: Box<K>,
-		mask: bool,
-		use_test_rng: bool,
-	) -> Result<Option<SecretKey>, Error> {
-		// store hash of master key, so it can be verified later after unmasking
-		let root_key = k.derive_key(0, &K::root_key_id(), SwitchCommitmentType::Regular)?;
-		let mut hasher = Blake2b::new(SECRET_KEY_SIZE);
-		hasher.update(&root_key.0[..]);
-		self.master_checksum = Box::new(Some(hasher.finalize()));
-
-		let mask_value = {
-			match mask {
-				true => {
-					// Random value that must be XORed against the stored wallet seed
-					// before it is used
-					let mask_value = match use_test_rng {
-						true => {
-							let mut test_rng = StepRng::new(1_234_567_890_u64, 1);
-							secp::key::SecretKey::new(&k.secp(), &mut test_rng)
-						}
-						false => secp::key::SecretKey::new(&k.secp(), &mut thread_rng()),
-					};
-					k.mask_master_key(&mask_value)?;
-					Some(mask_value)
-				}
-				false => None,
-			}
-		};
-
-		self.keychain = Some(*k);
-		Ok(mask_value)
-	}
-
-	/// Close wallet
-	fn close(&mut self) -> Result<(), Error> {
-		self.keychain = None;
-		Ok(())
-	}
-
-	/// Return the keychain being used, cloned with XORed token value
-	/// for temporary use
-	fn keychain(&self, mask: Option<&SecretKey>) -> Result<K, Error> {
-		match self.keychain.as_ref() {
-			Some(k) => {
-				let mut k_masked = k.clone();
-				if let Some(m) = mask {
-					k_masked.mask_master_key(m)?;
-				}
-				// Check if master seed is what is expected (especially if it's been xored)
-				let root_key =
-					k_masked.derive_key(0, &K::root_key_id(), SwitchCommitmentType::Regular)?;
-				let mut hasher = Blake2b::new(SECRET_KEY_SIZE);
-				hasher.update(&root_key.0[..]);
-				if *self.master_checksum != Some(hasher.finalize()) {
-					error!("Supplied keychain mask is invalid");
-					return Err(Error::InvalidKeychainMask);
-				}
-				Ok(k_masked)
-			}
-			None => Err(Error::KeychainDoesntExist),
-		}
-	}
-
-	/// Return the node client being used
-	fn w2n_client(&mut self) -> &mut C {
-		&mut self.w2n_client
-	}
-
-	/// return the version of the commit for caching
-	fn calc_commit_for_cache(
-		&mut self,
-		keychain_mask: Option<&SecretKey>,
-		amount: u64,
-		id: &Identifier,
-	) -> Result<Option<String>, Error> {
-		//TODO: Check if this is really necessary, it's the only thing
-		//preventing removing the need for config in the wallet backend
-		/*if self.config.no_commit_cache == Some(true) {
-			Ok(None)
-		} else {*/
-		Ok(Some(
-			self.keychain(keychain_mask)?
-				.commit(amount, &id, SwitchCommitmentType::Regular)?
-				.0
-				.to_vec()
-				.to_hex(), // TODO: proper support for different switch commitment schemes
-		))
-		/*}*/
-	}
-
-	/// Set parent path by account name
-	fn set_parent_key_id_by_name(&mut self, label: &str) -> Result<(), Error> {
-		let label = label.to_owned();
-		let res = self.acct_path_iter().find(|l| l.label == label);
-		if let Some(a) = res {
-			self.set_parent_key_id(a.path);
-			Ok(())
-		} else {
-			Err(Error::UnknownAccountLabel(label))
-		}
-	}
-
-	/// set parent path
-	fn set_parent_key_id(&mut self, id: Identifier) {
-		self.parent_key_id = id;
-	}
-
-	fn parent_key_id(&mut self) -> Identifier {
-		self.parent_key_id.clone()
-	}
-
-	fn get(&self, id: &Identifier, mmr_index: &Option<u64>) -> Result<OutputData, Error> {
-		let key = match mmr_index {
-			Some(i) => to_key_u64(OUTPUT_PREFIX, &mut id.to_bytes().to_vec(), *i),
-			None => to_key(OUTPUT_PREFIX, &mut id.to_bytes().to_vec()),
-		};
-		option_to_not_found(self.db.get_ser(&key, None), || format!("Key Id: {}", id))
-			.map_err(|e| e.into())
-	}
-
-	// TODO - fix this awkward conversion between PrefixIterator and our Box<dyn Iterator>
-	fn iter<'a>(&'a self) -> Box<dyn Iterator<Item = OutputData> + 'a> {
-		let protocol_version = self.db.protocol_version();
-		let prefix_iter = self.db.iter(&[OUTPUT_PREFIX], move |_, mut v| {
-			ser::deserialize(
-				&mut v,
-				protocol_version,
-				ser::DeserializationMode::default(),
-			)
-			.map_err(From::from)
-		});
-		let iter = prefix_iter.expect("deserialize").into_iter();
-		Box::new(iter)
-	}
-
-	fn get_tx_log_entry(&self, u: &Uuid) -> Result<Option<TxLogEntry>, Error> {
-		let key = to_key(TX_LOG_ENTRY_PREFIX, &mut u.as_bytes().to_vec());
-		self.db.get_ser(&key, None).map_err(|e| e.into())
-	}
-
-	// TODO - fix this awkward conversion between PrefixIterator and our Box<dyn Iterator>
-	fn tx_log_iter<'a>(&'a self) -> Box<dyn Iterator<Item = TxLogEntry> + 'a> {
-		let protocol_version = self.db.protocol_version();
-		let prefix_iter = self.db.iter(&[TX_LOG_ENTRY_PREFIX], move |_, mut v| {
-			ser::deserialize(
-				&mut v,
-				protocol_version,
-				ser::DeserializationMode::default(),
-			)
-			.map_err(From::from)
-		});
-		let iter = prefix_iter.expect("deserialize").into_iter();
-		Box::new(iter)
-	}
-
-	fn get_private_context(
-		&mut self,
-		keychain_mask: Option<&SecretKey>,
-		slate_id: &[u8],
-	) -> Result<Context, Error> {
-		let ctx_key = to_key_u64(PRIVATE_TX_CONTEXT_PREFIX, &mut slate_id.to_vec(), 0);
-		let (blind_xor_key, nonce_xor_key) =
-			private_ctx_xor_keys(&self.keychain(keychain_mask)?, slate_id)?;
-
-		let mut ctx: Context = option_to_not_found(self.db.get_ser(&ctx_key, None), || {
-			format!("Slate id: {:x?}", slate_id.to_vec())
-		})?;
-
-		for i in 0..SECRET_KEY_SIZE {
-			ctx.sec_key.0[i] ^= blind_xor_key[i];
-			ctx.sec_nonce.0[i] ^= nonce_xor_key[i];
-		}
-
-		Ok(ctx)
-	}
-
-	// TODO - fix this awkward conversion between PrefixIterator and our Box<dyn Iterator>
-	fn acct_path_iter<'a>(&'a self) -> Box<dyn Iterator<Item = AcctPathMapping> + 'a> {
-		let protocol_version = self.db.protocol_version();
-		let prefix_iter = self
-			.db
-			.iter(&[ACCOUNT_PATH_MAPPING_PREFIX], move |_, mut v| {
-				ser::deserialize(
-					&mut v,
-					protocol_version,
-					ser::DeserializationMode::default(),
-				)
-				.map_err(From::from)
-			});
-		let iter = prefix_iter.expect("deserialize").into_iter();
-		Box::new(iter)
-	}
-
-	fn get_acct_path(&self, label: String) -> Result<Option<AcctPathMapping>, Error> {
-		let acct_key = to_key(ACCOUNT_PATH_MAPPING_PREFIX, &mut label.as_bytes().to_vec());
-		self.db.get_ser(&acct_key, None).map_err(|e| e.into())
-	}
-
-	fn store_tx(&self, uuid: &str, tx: &Transaction) -> Result<(), Error> {
-		let filename = format!("{}.grintx", uuid);
-		let path = path::Path::new(&self.data_file_dir)
-			.join(TX_SAVE_DIR)
-			.join(filename);
-		let path_buf = Path::new(&path).to_path_buf();
-		let mut stored_tx = File::create(path_buf)?;
-		let tx_hex = ser::ser_vec(tx, ser::ProtocolVersion(1)).unwrap().to_hex();
-		stored_tx.write_all(&tx_hex.as_bytes())?;
-		stored_tx.sync_all()?;
-		Ok(())
-	}
-
-	fn get_stored_tx(&self, uuid: &str) -> Result<Option<Transaction>, Error> {
-		let filename = format!("{}.grintx", uuid);
-		let path = path::Path::new(&self.data_file_dir)
-			.join(TX_SAVE_DIR)
-			.join(filename);
-		let tx_file = Path::new(&path).to_path_buf();
-		let mut tx_f = File::open(tx_file)?;
-		let mut content = String::new();
-		tx_f.read_to_string(&mut content)?;
-		let tx_bin = util::from_hex(&content).unwrap();
-		Ok(Some(
-			ser::deserialize(
-				&mut &tx_bin[..],
-				ser::ProtocolVersion(1),
-				ser::DeserializationMode::default(),
-			)
-			.unwrap(),
-		))
-	}
-
-	fn batch<'a>(
-		&'a mut self,
-		keychain_mask: Option<&SecretKey>,
-	) -> Result<Box<dyn WalletOutputBatch<K> + 'a>, Error> {
-		Ok(Box::new(Batch {
-			_store: self,
-			db: RefCell::new(Some(self.db.batch()?)),
-			keychain: Some(self.keychain(keychain_mask)?),
-		}))
-	}
-
-	fn batch_no_mask<'a>(&'a mut self) -> Result<Box<dyn WalletOutputBatch<K> + 'a>, Error> {
-		Ok(Box::new(Batch {
-			_store: self,
-			db: RefCell::new(Some(self.db.batch()?)),
-			keychain: None,
-		}))
-	}
-
-	fn current_child_index<'a>(&mut self, parent_key_id: &Identifier) -> Result<u32, Error> {
-		let index = {
-			let batch = self.db.batch()?;
-			let deriv_key = to_key(DERIV_PREFIX, &mut parent_key_id.to_bytes().to_vec());
-			match batch.get_ser(&deriv_key, None)? {
-				Some(idx) => idx,
-				None => 0,
-			}
-		};
-		Ok(index)
-	}
-
-	fn next_child<'a>(&mut self, keychain_mask: Option<&SecretKey>) -> Result<Identifier, Error> {
-		let parent_key_id = self.parent_key_id.clone();
-		let mut deriv_idx = {
-			let batch = self.db.batch()?;
-			let deriv_key = to_key(DERIV_PREFIX, &mut self.parent_key_id.to_bytes().to_vec());
-			match batch.get_ser(&deriv_key, None)? {
-				Some(idx) => idx,
-				None => 0,
-			}
-		};
-		let mut return_path = self.parent_key_id.to_path();
-		return_path.depth += 1;
-		return_path.path[return_path.depth as usize - 1] = ChildNumber::from(deriv_idx);
-		deriv_idx += 1;
-		let mut batch = self.batch(keychain_mask)?;
-		batch.save_child_index(&parent_key_id, deriv_idx)?;
-		batch.commit()?;
-		Ok(Identifier::from_path(&return_path))
-	}
-
-	fn last_confirmed_height<'a>(&mut self) -> Result<u64, Error> {
-		let batch = self.db.batch()?;
-		let height_key = to_key(
-			CONFIRMED_HEIGHT_PREFIX,
-			&mut self.parent_key_id.to_bytes().to_vec(),
-		);
-		let last_confirmed_height = match batch.get_ser(&height_key, None)? {
-			Some(h) => h,
-			None => 0,
-		};
-		Ok(last_confirmed_height)
-	}
-
-	fn last_scanned_block<'a>(&mut self) -> Result<ScannedBlockInfo, Error> {
-		let batch = self.db.batch()?;
-		let scanned_block_key = to_key(
-			LAST_SCANNED_BLOCK,
-			&mut LAST_SCANNED_KEY.as_bytes().to_vec(),
-		);
-		let last_scanned_block = match batch.get_ser(&scanned_block_key, None)? {
-			Some(b) => b,
-			None => ScannedBlockInfo {
-				height: 0,
-				hash: "".to_owned(),
-				start_pmmr_index: 0,
-				last_pmmr_index: 0,
-			},
-		};
-		Ok(last_scanned_block)
-	}
-
-	fn init_status<'a>(&mut self) -> Result<WalletInitStatus, Error> {
-		let batch = self.db.batch()?;
-		let init_status_key = to_key(
-			WALLET_INIT_STATUS,
-			&mut WALLET_INIT_STATUS_KEY.as_bytes().to_vec(),
-		);
-		let status = match batch.get_ser(&init_status_key, None)? {
-			Some(s) => s,
-			None => WalletInitStatus::InitComplete,
-		};
-		Ok(status)
-	}
-}
-
-/// An atomic batch in which all changes can be committed all at once or
-/// discarded on error.
-pub struct Batch<'a, C, K>
-where
-	C: NodeClient,
-	K: Keychain,
-{
-	_store: &'a LMDBBackend<'a, C, K>,
-	db: RefCell<Option<store::Batch<'a>>>,
-	/// Keychain
-	keychain: Option<K>,
-}
-
-#[allow(missing_docs)]
-impl<'a, C, K> WalletOutputBatch<K> for Batch<'a, C, K>
-where
-	C: NodeClient,
-	K: Keychain,
-{
-	fn keychain(&mut self) -> &mut K {
-		self.keychain.as_mut().unwrap()
-	}
-
-	fn save(&mut self, out: OutputData) -> Result<(), Error> {
-		// Save the output data to the db.
-		{
-			let key = match out.mmr_index {
-				Some(i) => to_key_u64(OUTPUT_PREFIX, &mut out.key_id.to_bytes().to_vec(), i),
-				None => to_key(OUTPUT_PREFIX, &mut out.key_id.to_bytes().to_vec()),
-			};
-			self.db.borrow().as_ref().unwrap().put_ser(&key, &out)?;
-		}
-
-		Ok(())
-	}
-
-	fn get(&self, id: &Identifier, mmr_index: &Option<u64>) -> Result<OutputData, Error> {
-		let key = match mmr_index {
-			Some(i) => to_key_u64(OUTPUT_PREFIX, &mut id.to_bytes().to_vec(), *i),
-			None => to_key(OUTPUT_PREFIX, &mut id.to_bytes().to_vec()),
-		};
-		option_to_not_found(
-			self.db.borrow().as_ref().unwrap().get_ser(&key, None),
-			|| format!("Key ID: {}", id),
-		)
-		.map_err(|e| e.into())
-	}
-
-	// TODO - fix this awkward conversion between PrefixIterator and our Box<dyn Iterator>
-	fn iter(&self) -> Box<dyn Iterator<Item = OutputData>> {
-		let db = self.db.borrow();
-		let db = db.as_ref().unwrap();
-		let protocol_version = db.protocol_version();
-		let prefix_iter = db.iter(&[OUTPUT_PREFIX], move |_, mut v| {
-			ser::deserialize(
-				&mut v,
-				protocol_version,
-				ser::DeserializationMode::default(),
-			)
-			.map_err(From::from)
-		});
-		let iter = prefix_iter.expect("deserialize").into_iter();
-		Box::new(iter)
-	}
-
-	fn delete(&mut self, id: &Identifier, mmr_index: &Option<u64>) -> Result<(), Error> {
-		// Delete the output data.
-		{
-			let key = match mmr_index {
-				Some(i) => to_key_u64(OUTPUT_PREFIX, &mut id.to_bytes().to_vec(), *i),
-				None => to_key(OUTPUT_PREFIX, &mut id.to_bytes().to_vec()),
-			};
-			let _ = self.db.borrow().as_ref().unwrap().delete(&key);
-		}
-
-		Ok(())
-	}
-
-	fn next_tx_log_id(&mut self, parent_key_id: &Identifier) -> Result<u32, Error> {
-		let tx_id_key = to_key(TX_LOG_ID_PREFIX, &mut parent_key_id.to_bytes().to_vec());
-		let last_tx_log_id = match self
-			.db
-			.borrow()
-			.as_ref()
-			.unwrap()
-			.get_ser(&tx_id_key, None)?
-		{
-			Some(t) => t,
-			None => 0,
-		};
-		self.db
-			.borrow()
-			.as_ref()
-			.unwrap()
-			.put_ser(&tx_id_key, &(last_tx_log_id + 1))?;
-		Ok(last_tx_log_id)
-	}
-
-	// TODO - fix this awkward conversion between PrefixIterator and our Box<dyn Iterator>
-	fn tx_log_iter(&self) -> Box<dyn Iterator<Item = TxLogEntry>> {
-		let db = self.db.borrow();
-		let db = db.as_ref().unwrap();
-		let protocol_version = db.protocol_version();
-		let prefix_iter = db.iter(&[TX_LOG_ENTRY_PREFIX], move |_, mut v| {
-			ser::deserialize(
-				&mut v,
-				protocol_version,
-				ser::DeserializationMode::default(),
-			)
-			.map_err(From::from)
-		});
-		let iter = prefix_iter.expect("deserialize").into_iter();
-		Box::new(iter)
-	}
-
-	fn save_last_confirmed_height(
-		&mut self,
-		parent_key_id: &Identifier,
-		height: u64,
-	) -> Result<(), Error> {
-		let height_key = to_key(
-			CONFIRMED_HEIGHT_PREFIX,
-			&mut parent_key_id.to_bytes().to_vec(),
-		);
-		self.db
-			.borrow()
-			.as_ref()
-			.unwrap()
-			.put_ser(&height_key, &height)?;
-		Ok(())
-	}
-
-	fn save_last_scanned_block(&mut self, block_info: ScannedBlockInfo) -> Result<(), Error> {
-		let pmmr_index_key = to_key(
-			LAST_SCANNED_BLOCK,
-			&mut LAST_SCANNED_KEY.as_bytes().to_vec(),
-		);
-		self.db
-			.borrow()
-			.as_ref()
-			.unwrap()
-			.put_ser(&pmmr_index_key, &block_info)?;
-		Ok(())
-	}
-
-	fn save_init_status(&mut self, value: WalletInitStatus) -> Result<(), Error> {
-		let init_status_key = to_key(
-			WALLET_INIT_STATUS,
-			&mut WALLET_INIT_STATUS_KEY.as_bytes().to_vec(),
-		);
-		self.db
-			.borrow()
-			.as_ref()
-			.unwrap()
-			.put_ser(&init_status_key, &value)?;
-		Ok(())
-	}
-
-	fn save_child_index(&mut self, parent_id: &Identifier, child_n: u32) -> Result<(), Error> {
-		let deriv_key = to_key(DERIV_PREFIX, &mut parent_id.to_bytes().to_vec());
-		self.db
-			.borrow()
-			.as_ref()
-			.unwrap()
-			.put_ser(&deriv_key, &child_n)?;
-		Ok(())
-	}
-
-	fn save_tx_log_entry(
-		&mut self,
-		tx_in: TxLogEntry,
-		parent_id: &Identifier,
-	) -> Result<(), Error> {
-		let tx_log_key = to_key_u64(
-			TX_LOG_ENTRY_PREFIX,
-			&mut parent_id.to_bytes().to_vec(),
-			tx_in.id as u64,
-		);
-		self.db
-			.borrow()
-			.as_ref()
-			.unwrap()
-			.put_ser(&tx_log_key, &tx_in)?;
-		Ok(())
-	}
-
-	fn delete_tx_log_entry(&mut self, tx_id: u32, parent_id: &Identifier) -> Result<(), Error> {
-		let tx_log_key = to_key_u64(
-			TX_LOG_ENTRY_PREFIX,
-			&mut parent_id.to_bytes().to_vec(),
-			tx_id as u64,
-		);
-		self.db.borrow().as_ref().unwrap().delete(&tx_log_key)?;
-		Ok(())
-	}
-
-	fn save_acct_path(&mut self, mapping: AcctPathMapping) -> Result<(), Error> {
-		let acct_key = to_key(
-			ACCOUNT_PATH_MAPPING_PREFIX,
-			&mut mapping.label.as_bytes().to_vec(),
-		);
-		self.db
-			.borrow()
-			.as_ref()
-			.unwrap()
-			.put_ser(&acct_key, &mapping)?;
-		Ok(())
-	}
-
-	// TODO - fix this awkward conversion between PrefixIterator and our Box<dyn Iterator>
-	fn acct_path_iter(&self) -> Box<dyn Iterator<Item = AcctPathMapping>> {
-		let db = self.db.borrow();
-		let db = db.as_ref().unwrap();
-		let protocol_version = db.protocol_version();
-		let prefix_iter = db.iter(&[ACCOUNT_PATH_MAPPING_PREFIX], move |_, mut v| {
-			ser::deserialize(
-				&mut v,
-				protocol_version,
-				ser::DeserializationMode::default(),
-			)
-			.map_err(From::from)
-		});
-		let iter = prefix_iter.expect("deserialize").into_iter();
-		Box::new(iter)
-	}
-
-	fn lock_output(&mut self, out: &mut OutputData) -> Result<(), Error> {
-		out.lock();
-		self.save(out.clone())
-	}
-
-	fn save_private_context(&mut self, slate_id: &[u8], ctx: &Context) -> Result<(), Error> {
-		let ctx_key = to_key_u64(PRIVATE_TX_CONTEXT_PREFIX, &mut slate_id.to_vec(), 0);
-		let (blind_xor_key, nonce_xor_key) = private_ctx_xor_keys(self.keychain(), slate_id)?;
-
-		let mut s_ctx = ctx.clone();
-		for i in 0..SECRET_KEY_SIZE {
-			s_ctx.sec_key.0[i] ^= blind_xor_key[i];
-			s_ctx.sec_nonce.0[i] ^= nonce_xor_key[i];
-		}
-
-		self.db
-			.borrow()
-			.as_ref()
-			.unwrap()
-			.put_ser(&ctx_key, &s_ctx)?;
-		Ok(())
-	}
-
-	fn delete_private_context(&mut self, slate_id: &[u8]) -> Result<(), Error> {
-		let ctx_key = to_key_u64(PRIVATE_TX_CONTEXT_PREFIX, &mut slate_id.to_vec(), 0);
-		self.db
-			.borrow()
-			.as_ref()
-			.unwrap()
-			.delete(&ctx_key)
-			.map_err(|e| e.into())
-	}
-
-	fn commit(&self) -> Result<(), Error> {
-		let db = self.db.replace(None);
-		db.unwrap().commit()?;
-		Ok(())
-	}
-}

impls/src/backends/mod.rs

@@ -1,17 +0,0 @@
-// Copyright 2021 The Grin Developers
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-mod lmdb;
-
-pub use self::lmdb::{wallet_db_exists, LMDBBackend};

impls/src/lib.rs

@@ -28,14 +28,12 @@ use grin_api as api;
 use grin_chain as chain;
 use grin_core as core;
 use grin_keychain as keychain;
-use grin_store as store;
 use grin_util as util;
 use grin_wallet_libwallet as libwallet;
 
 use grin_wallet_config as config;
 
 mod adapters;
-mod backends;
 mod client_utils;
 mod error;
 mod lifecycle;
@@ -47,7 +45,6 @@ pub use crate::adapters::{
 	HttpSlateSender, PathToSlate, PathToSlatepack, SlateGetter, SlatePutter, SlateReceiver,
 	SlateSender,
 };
-pub use crate::backends::{wallet_db_exists, LMDBBackend};
 pub use crate::error::Error;
 pub use crate::lifecycle::DefaultLCProvider;
 pub use crate::node_clients::HTTPNodeClient;
@@ -57,35 +54,31 @@ use crate::keychain::{ExtKeychain, Keychain};
 use libwallet::{NodeClient, WalletInst, WalletLCProvider};
 
 /// Main wallet instance
-pub struct DefaultWalletImpl<'a, C>
+pub struct DefaultWalletImpl<C>
 where
-	C: NodeClient + 'a,
+	C: NodeClient,
 {
-	lc_provider: DefaultLCProvider<'a, C, ExtKeychain>,
+	lc_provider: DefaultLCProvider<C, ExtKeychain>,
 }
 
-impl<'a, C> DefaultWalletImpl<'a, C>
+impl<C> DefaultWalletImpl<C>
 where
-	C: NodeClient + 'a,
+	C: NodeClient,
 {
 	pub fn new(node_client: C) -> Result<Self, Error> {
 		let lc_provider = DefaultLCProvider::new(node_client);
-		Ok(DefaultWalletImpl {
-			lc_provider: lc_provider,
-		})
+		Ok(DefaultWalletImpl { lc_provider })
 	}
 }
 
-impl<'a, L, C, K> WalletInst<'a, L, C, K> for DefaultWalletImpl<'a, C>
+impl<'a, L, C, K> WalletInst<'a, L, C, K> for DefaultWalletImpl<C>
 where
-	DefaultLCProvider<'a, C, ExtKeychain>: WalletLCProvider<'a, C, K>,
+	DefaultLCProvider<C, ExtKeychain>: WalletLCProvider<'a, C, K>,
 	L: WalletLCProvider<'a, C, K>,
 	C: NodeClient + 'a,
 	K: Keychain + 'a,
 {
-	fn lc_provider(
-		&mut self,
-	) -> Result<&mut (dyn WalletLCProvider<'a, C, K> + 'a), libwallet::Error> {
+	fn lc_provider(&mut self) -> Result<&mut dyn WalletLCProvider<'a, C, K>, libwallet::Error> {
 		Ok(&mut self.lc_provider)
 	}
 }

impls/src/lifecycle/default.rs

@@ -23,13 +23,12 @@ use crate::libwallet::{Error, NodeClient, WalletBackend, WalletInitStatus, Walle
 use crate::lifecycle::seed::WalletSeed;
 use crate::util::secp::key::SecretKey;
 use crate::util::ZeroingString;
-use crate::LMDBBackend;
 use grin_util::logger::LoggingConfig;
 use std::fs;
 use std::path::PathBuf;
 use std::path::MAIN_SEPARATOR;
 
-// Helper fuction to format paths according to OS, avoids bugs on Linux
+/// Helper function to format paths according to OS, avoids bugs on Linux
 pub fn fmt_path(path: String) -> String {
 	let sep = &MAIN_SEPARATOR.to_string();
 	let path = path.replace("/", &sep);
@@ -37,20 +36,20 @@ pub fn fmt_path(path: String) -> String {
 	path
 }
 
-pub struct DefaultLCProvider<'a, C, K>
+pub struct DefaultLCProvider<C, K>
 where
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	data_dir: String,
 	node_client: C,
-	backend: Option<Box<dyn WalletBackend<'a, C, K> + 'a>>,
+	backend: Option<WalletBackend<C, K>>,
 }
 
-impl<'a, C, K> DefaultLCProvider<'a, C, K>
+impl<C, K> DefaultLCProvider<C, K>
 where
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	/// Create new provider
 	pub fn new(node_client: C) -> Self {
@@ -62,7 +61,7 @@ where
 	}
 }
 
-impl<'a, C, K> WalletLCProvider<'a, C, K> for DefaultLCProvider<'a, C, K>
+impl<'a, C, K> WalletLCProvider<'a, C, K> for DefaultLCProvider<C, K>
 where
 	C: NodeClient + 'a,
 	K: Keychain + 'a,
@@ -217,8 +216,8 @@ where
 			Error::Lifecycle("Error creating wallet seed (is mnemonic valid?)".to_owned())
 		})?;
 		info!("Wallet seed file created");
-		let mut wallet: LMDBBackend<'a, C, K> =
-			match LMDBBackend::new(&data_dir_name, self.node_client.clone()) {
+		let mut wallet: WalletBackend<C, K> =
+			match WalletBackend::new(&data_dir_name, self.node_client.clone()) {
 				Err(e) => {
 					let msg = format!("Error creating wallet: {}, Data Dir: {}", e, &data_dir_name);
 					error!("{}", msg);
@@ -247,8 +246,8 @@ where
 		let mut data_dir_name = PathBuf::from(self.data_dir.clone());
 		data_dir_name.push(GRIN_WALLET_DIR);
 		let data_dir_name = fmt_path(data_dir_name.to_str().unwrap().to_string());
-		let mut wallet: LMDBBackend<'a, C, K> =
-			match LMDBBackend::new(&data_dir_name, self.node_client.clone()) {
+		let mut wallet: WalletBackend<C, K> =
+			match WalletBackend::new(&data_dir_name, self.node_client.clone()) {
 				Err(e) => {
 					let msg = format!("Error opening wallet: {}, Data Dir: {}", e, &data_dir_name);
 					return Err(Error::Lifecycle(msg));
@@ -262,8 +261,8 @@ where
 			.derive_keychain(global::is_testnet())
 			.map_err(|_| Error::Lifecycle("Error deriving keychain".to_owned()))?;
 
-		let mask = wallet.set_keychain(Box::new(keychain), create_mask, use_test_rng)?;
-		self.backend = Some(Box::new(wallet));
+		let mask = wallet.set_keychain(keychain, create_mask, use_test_rng)?;
+		self.backend = Some(wallet);
 		Ok(mask)
 	}
 
@@ -329,8 +328,7 @@ where
 		let mut data_dir_name = PathBuf::from(self.data_dir.clone());
 		data_dir_name.push(GRIN_WALLET_DIR);
 		let data_dir_name = data_dir_name.to_str().unwrap();
-		// get seed for later check
-
+		// Get seed for later check
 		let orig_wallet_seed = WalletSeed::from_file(&data_dir_name, old)
 			.map_err(|_| Error::Lifecycle("Error opening wallet seed file".into()))?;
 		let orig_mnemonic = orig_wallet_seed
@@ -366,7 +364,7 @@ where
 					.to_string();
 			return Err(Error::Lifecycle(msg));
 		}
-		// Removin
+		// Removing old file
 		info!("Password change confirmed, removing old seed file.");
 		fs::remove_file(backup_name).map_err(|e| Error::IO(e.to_string()))?;
 
@@ -383,13 +381,13 @@ where
 		Ok(())
 	}
 
-	fn wallet_inst(&mut self) -> Result<&mut Box<dyn WalletBackend<'a, C, K> + 'a>, Error> {
+	fn wallet_inst(&mut self) -> Result<&mut WalletBackend<C, K>, Error> {
 		match self.backend.as_mut() {
 			None => {
 				let msg = "Wallet has not been opened".into();
 				Err(Error::Lifecycle(msg))
 			}
-			Some(_) => Ok(&mut *self.backend.as_mut().unwrap()),
+			Some(b) => Ok(b),
 		}
 	}
 }

impls/src/lifecycle/seed.rs

@@ -25,6 +25,7 @@ use ring::aead;
 use ring::pbkdf2;
 
 use crate::keychain::{mnemonic, Keychain};
+use crate::lifecycle::default::fmt_path;
 use crate::util::{self, ToHex};
 use crate::Error;
 
@@ -56,13 +57,6 @@ impl WalletSeed {
 		self.0.to_vec().to_hex()
 	}
 
-	// Helper fuction to format paths according to OS, avoids bugs on Linux
-	pub fn fmt_path(path: String) -> String {
-		let sep = &MAIN_SEPARATOR.to_string();
-		let path = path.replace("/", &sep);
-		let path = path.replace("\\", &sep);
-		path
-	}
 	pub fn to_mnemonic(&self) -> Result<String, Error> {
 		let result = mnemonic::from_entropy(&self.0);
 		match result {
@@ -105,7 +99,7 @@ impl WalletSeed {
 	pub fn seed_file_exists(data_file_dir: &str) -> Result<bool, Error> {
 		let seed_file_path = &format!(
 			"{}{}{}",
-			Self::fmt_path(data_file_dir.to_string()),
+			fmt_path(data_file_dir.to_string()),
 			MAIN_SEPARATOR,
 			SEED_FILE,
 		);
@@ -145,7 +139,7 @@ impl WalletSeed {
 	) -> Result<(), Error> {
 		let seed_file_path = &format!(
 			"{}{}{}",
-			Self::fmt_path(data_file_dir.to_string()),
+			fmt_path(data_file_dir.to_string()),
 			MAIN_SEPARATOR,
 			SEED_FILE,
 		);
@@ -184,11 +178,11 @@ impl WalletSeed {
 
 		let seed_file_path = &format!(
 			"{}{}{}",
-			Self::fmt_path(data_file_dir.to_string()),
+			fmt_path(data_file_dir.to_string()),
 			MAIN_SEPARATOR,
 			SEED_FILE,
 		);
-		let data_file_dir = Self::fmt_path(data_file_dir.to_string());
+		let data_file_dir = fmt_path(data_file_dir.to_string());
 		warn!("Generating wallet seed file at: {}", seed_file_path);
 		let exists = WalletSeed::seed_file_exists(&data_file_dir)?;
 		if exists && !test_mode {
@@ -219,7 +213,7 @@ impl WalletSeed {
 
 		let seed_file_path = &format!(
 			"{}{}{}",
-			Self::fmt_path(data_file_dir.to_string()),
+			fmt_path(data_file_dir.to_string()),
 			MAIN_SEPARATOR,
 			SEED_FILE,
 		);
@@ -247,7 +241,7 @@ impl WalletSeed {
 	pub fn delete_seed_file(data_file_dir: &str) -> Result<(), Error> {
 		let seed_file_path = &format!(
 			"{}{}{}",
-			Self::fmt_path(data_file_dir.to_string()),
+			fmt_path(data_file_dir.to_string()),
 			MAIN_SEPARATOR,
 			SEED_FILE,
 		);

impls/src/test_framework/mod.rs

@@ -18,7 +18,6 @@ use crate::chain::Chain;
 use crate::core;
 use crate::core::core::{Output, Transaction, TxKernel};
 use crate::core::{consensus, global, pow};
-use crate::keychain;
 use crate::libwallet;
 use crate::libwallet::api_impl::{foreign, owner};
 use crate::libwallet::{
@@ -28,6 +27,7 @@ use crate::util::secp::key::SecretKey;
 use crate::util::secp::pedersen;
 use crate::util::Mutex;
 use chrono::Duration;
+use grin_keychain::Keychain;
 use std::sync::Arc;
 use std::thread;
 
@@ -36,7 +36,7 @@ mod testclient;
 pub use self::{testclient::LocalWalletClient, testclient::WalletProxy};
 
 /// Get an output from the chain locally and present it back as an API output
-fn get_output_local(chain: &chain::Chain, commit: pedersen::Commitment) -> Option<api::Output> {
+fn get_output_local(chain: &Chain, commit: pedersen::Commitment) -> Option<api::Output> {
 	if chain.get_unspent(commit).unwrap().is_some() {
 		let block_height = chain.get_header_for_output(commit).unwrap().height;
 		let output_pos = chain.get_output_pos(&commit).unwrap_or(0);
@@ -48,7 +48,7 @@ fn get_output_local(chain: &chain::Chain, commit: pedersen::Commitment) -> Optio
 
 /// Get a kernel from the chain locally
 fn get_kernel_local(
-	chain: Arc<chain::Chain>,
+	chain: Arc<Chain>,
 	excess: &pedersen::Commitment,
 	min_height: Option<u64>,
 	max_height: Option<u64>,
@@ -65,7 +65,7 @@ fn get_kernel_local(
 
 /// get output listing traversing pmmr from local
 fn get_outputs_by_pmmr_index_local(
-	chain: Arc<chain::Chain>,
+	chain: Arc<Chain>,
 	start_index: u64,
 	end_index: Option<u64>,
 	max: u64,
@@ -86,7 +86,7 @@ fn get_outputs_by_pmmr_index_local(
 
 /// get output listing in a given block range
 fn height_range_to_pmmr_indices_local(
-	chain: Arc<chain::Chain>,
+	chain: Arc<Chain>,
 	start_index: u64,
 	end_index: Option<u64>,
 ) -> api::OutputListing {
@@ -147,13 +147,13 @@ pub fn create_block_for_wallet<'a, L, C, K>(
 	chain: &Chain,
 	prev: core::core::BlockHeader,
 	txs: &[Transaction],
-	wallet: Arc<Mutex<Box<dyn WalletInst<'a, L, C, K> + 'a>>>,
+	wallet: Arc<Mutex<Box<dyn WalletInst<'a, L, C, K>>>>,
 	keychain_mask: Option<&SecretKey>,
 ) -> Result<core::core::Block, libwallet::Error>
 where
 	L: WalletLCProvider<'a, C, K>,
 	C: NodeClient + 'a,
-	K: keychain::Keychain + 'a,
+	K: Keychain + 'a,
 {
 	// build block fees
 	let fee_amt = txs.iter().map(|tx| tx.fee()).sum();
@@ -166,7 +166,7 @@ where
 	let coinbase_tx = {
 		let mut w_lock = wallet.lock();
 		let w = w_lock.lc_provider()?.wallet_inst()?;
-		foreign::build_coinbase(&mut **w, keychain_mask, &block_fees, false)?
+		foreign::build_coinbase(w, keychain_mask, &block_fees, false)?
 	};
 	let block = create_block_with_reward(chain, prev, txs, coinbase_tx.output, coinbase_tx.kernel);
 	Ok(block)
@@ -178,13 +178,13 @@ where
 pub fn award_block_to_wallet<'a, L, C, K>(
 	chain: &Chain,
 	txs: &[Transaction],
-	wallet: Arc<Mutex<Box<dyn WalletInst<'a, L, C, K> + 'a>>>,
+	wallet: Arc<Mutex<Box<dyn WalletInst<'a, L, C, K>>>>,
 	keychain_mask: Option<&SecretKey>,
 ) -> Result<(), libwallet::Error>
 where
 	L: WalletLCProvider<'a, C, K>,
 	C: NodeClient + 'a,
-	K: keychain::Keychain + 'a,
+	K: Keychain + 'a,
 {
 	let prev = chain.head_header().unwrap();
 	let block = create_block_for_wallet(chain, prev, txs, wallet, keychain_mask)?;
@@ -200,7 +200,7 @@ pub fn process_block(chain: &Chain, block: core::core::Block) {
 /// Award a blocks to a wallet directly
 pub fn award_blocks_to_wallet<'a, L, C, K>(
 	chain: &Chain,
-	wallet: Arc<Mutex<Box<dyn WalletInst<'a, L, C, K> + 'a>>>,
+	wallet: Arc<Mutex<Box<dyn WalletInst<'a, L, C, K>>>>,
 	keychain_mask: Option<&SecretKey>,
 	number: usize,
 	pause_between: bool,
@@ -208,7 +208,7 @@ pub fn award_blocks_to_wallet<'a, L, C, K>(
 where
 	L: WalletLCProvider<'a, C, K>,
 	C: NodeClient + 'a,
-	K: keychain::Keychain + 'a,
+	K: Keychain + 'a,
 {
 	for _ in 0..number {
 		award_block_to_wallet(chain, &[], wallet.clone(), keychain_mask)?;
@@ -231,7 +231,7 @@ pub fn send_to_dest<'a, L, C, K>(
 where
 	L: WalletLCProvider<'a, C, K>,
 	C: NodeClient + 'a,
-	K: keychain::Keychain + 'a,
+	K: Keychain + 'a,
 {
 	let slate = {
 		let mut w_lock = wallet.lock();
@@ -245,10 +245,10 @@ where
 			selection_strategy_is_use_all: true,
 			..Default::default()
 		};
-		let slate_i = owner::init_send_tx(&mut **w, keychain_mask, args, test_mode)?;
+		let slate_i = owner::init_send_tx(w, keychain_mask, args, test_mode)?;
 		let slate = client.send_tx_slate_direct(dest, &slate_i)?;
-		owner::tx_lock_outputs(&mut **w, keychain_mask, &slate)?;
-		owner::finalize_tx(&mut **w, keychain_mask, &slate)?
+		owner::tx_lock_outputs(w, keychain_mask, &slate)?;
+		owner::finalize_tx(w, keychain_mask, &slate)?
 	};
 	let client = {
 		let mut w_lock = wallet.lock();
@@ -267,7 +267,7 @@ pub fn wallet_info<'a, L, C, K>(
 where
 	L: WalletLCProvider<'a, C, K>,
 	C: NodeClient + 'a,
-	K: keychain::Keychain + 'a,
+	K: Keychain + 'a,
 {
 	let (wallet_refreshed, wallet_info) =
 		owner::retrieve_summary_info(wallet, keychain_mask, &None, true, 1)?;

impls/src/test_framework/testclient.rs

@@ -70,7 +70,7 @@ where
 		String,
 		(
 			Sender<WalletProxyMessage>,
-			Arc<Mutex<Box<dyn WalletInst<'a, L, C, K> + 'a>>>,
+			Arc<Mutex<Box<dyn WalletInst<'a, L, C, K>>>>,
 			Option<SecretKey>,
 		),
 	>,
@@ -100,14 +100,15 @@ where
 			genesis_block,
 			pow::verify_size,
 			false,
+			None,
 		)
 		.unwrap();
 		let (tx, rx) = channel();
 		WalletProxy {
 			chain_dir: chain_dir.to_owned(),
 			chain: Arc::new(c),
-			tx: tx,
-			rx: rx,
+			tx,
+			rx,
 			wallets: HashMap::new(),
 			running: Arc::new(AtomicBool::new(false)),
 		}
@@ -118,7 +119,7 @@ where
 		&mut self,
 		addr: &str,
 		tx: Sender<WalletProxyMessage>,
-		wallet: Arc<Mutex<Box<dyn WalletInst<'a, L, C, K> + 'a>>>,
+		wallet: Arc<Mutex<Box<dyn WalletInst<'a, L, C, K>>>>,
 		keychain_mask: Option<SecretKey>,
 	) {
 		self.wallets
@@ -218,8 +219,7 @@ where
 			let w = w_lock.lc_provider()?.wallet_inst()?;
 			let mask = wallet.2.clone();
 			// receive tx
-			match foreign::receive_tx(&mut **w, (&mask).as_ref(), &Slate::from(slate), None, false)
-			{
+			match foreign::receive_tx(w, (&mask).as_ref(), &Slate::from(slate), None, false) {
 				Err(e) => {
 					return Ok(WalletProxyMessage {
 						sender_id: m.dest,

libwallet/Cargo.toml

@@ -46,10 +46,10 @@ grin_wallet_config = { path = "../config", version = "5.4.0-alpha.1" }
 ##### Grin Imports
 
 # For Release
-grin_core = "5.4.0"
-grin_keychain = "5.4.0"
-grin_util = "5.4.0"
-grin_store = "5.4.0"
+#grin_core = "5.4.0"
+#grin_keychain = "5.4.0"
+#grin_util = "5.4.0"
+#grin_store = "5.4.0"
 
 # For beta release
 
@@ -59,10 +59,10 @@ grin_store = "5.4.0"
 # grin_store = { git = "https://github.com/mimblewimble/grin", tag = "v5.2.0-beta.3" }
 
 # For bleeding edge
-# grin_core = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_keychain = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_util = { git = "https://github.com/mimblewimble/grin", branch = "master" }
-# grin_store = { git = "https://github.com/mimblewimble/grin", branch = "master" }
+grin_core = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_keychain = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_util = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
+grin_store = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
 
 # For local testing
 # grin_core = { path = "../../grin/core"}
@@ -70,4 +70,4 @@ grin_store = "5.4.0"
 # grin_util = { path = "../../grin/util"}
 # grin_store = { path = "../../grin/store"}
 
-##### 
+#####

libwallet/src/api_impl/foreign.rs

@@ -15,7 +15,9 @@
 //! Generic implementation of owner API functions
 use strum::IntoEnumIterator;
 
+use super::owner::tx_lock_outputs;
 use crate::api_impl::owner::{check_ttl, post_tx};
+use crate::backend::WalletBackend;
 use crate::grin_core::core::FeeFields;
 use crate::grin_keychain::Keychain;
 use crate::grin_util::secp::key::SecretKey;
@@ -23,11 +25,8 @@ use crate::internal::{selection, tx, updater};
 use crate::slate_versions::SlateVersion;
 use crate::{
 	address, BlockFees, CbData, Error, NodeClient, Slate, SlateState, TxLogEntryType, VersionInfo,
-	WalletBackend,
 };
 
-use super::owner::tx_lock_outputs;
-
 const FOREIGN_API_VERSION: u16 = 2;
 
 /// Return the version info
@@ -39,32 +38,30 @@ pub fn check_version() -> VersionInfo {
 }
 
 /// Build a coinbase transaction
-pub fn build_coinbase<'a, T: ?Sized, C, K>(
-	w: &mut T,
+pub fn build_coinbase<C, K>(
+	w: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	block_fees: &BlockFees,
 	test_mode: bool,
 ) -> Result<CbData, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	updater::build_coinbase(&mut *w, keychain_mask, block_fees, test_mode)
 }
 
 /// Receive a tx as recipient
-pub fn receive_tx<'a, T: ?Sized, C, K>(
-	w: &mut T,
+pub fn receive_tx<C, K>(
+	w: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	slate: &Slate,
 	dest_acct_name: Option<&str>,
 	use_test_rng: bool,
 ) -> Result<Slate, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let mut ret_slate = slate.clone();
 	check_ttl(w, &ret_slate)?;
@@ -133,16 +130,15 @@ where
 }
 
 /// Receive a tx that this wallet has issued
-pub fn finalize_tx<'a, T: ?Sized, C, K>(
-	w: &mut T,
+pub fn finalize_tx<C, K>(
+	w: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	slate: &Slate,
 	post_automatically: bool,
 ) -> Result<Slate, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let mut sl = slate.clone();
 	let mut context = w.get_private_context(keychain_mask, sl.id.as_bytes())?;

libwallet/src/api_impl/owner.rs

@@ -31,15 +31,14 @@ use crate::api_impl::owner_updater::StatusMessage;
 use crate::grin_keychain::{BlindingFactor, Identifier, Keychain, SwitchCommitmentType};
 use crate::internal::{keys, scan, selection, tx, updater};
 use crate::slate::{PaymentInfo, Slate, SlateState};
-use crate::types::{AcctPathMapping, NodeClient, TxLogEntry, WalletBackend, WalletInfo};
-use crate::Error;
+use crate::types::{AcctPathMapping, NodeClient, TxLogEntry, WalletInfo};
 use crate::{
 	address,
 	mwixnet::{create_onion, ComSignature, Hop, MixnetReqCreationParams, SwapReq},
-	wallet_lock, BuiltOutput, InitTxArgs, IssueInvoiceTxArgs, NodeHeightResult,
+	wallet_lock, BuiltOutput, Error, InitTxArgs, IssueInvoiceTxArgs, NodeHeightResult,
 	OutputCommitMapping, PaymentProof, RetrieveTxQueryArgs, ScannedBlockInfo, Slatepack,
-	SlatepackAddress, Slatepacker, SlatepackerArgs, TxLogEntryType, ViewWallet, WalletInitStatus,
-	WalletInst, WalletLCProvider,
+	SlatepackAddress, Slatepacker, SlatepackerArgs, TxLogEntryType, ViewWallet, WalletBackend,
+	WalletInitStatus, WalletInst, WalletLCProvider,
 };
 
 use ed25519_dalek::PublicKey as DalekPublicKey;
@@ -52,35 +51,32 @@ use std::sync::mpsc::Sender;
 use std::sync::Arc;
 
 /// List of accounts
-pub fn accounts<'a, T: ?Sized, C, K>(w: &mut T) -> Result<Vec<AcctPathMapping>, Error>
+pub fn accounts<C, K>(w: &mut WalletBackend<C, K>) -> Result<Vec<AcctPathMapping>, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	keys::accounts(&mut *w)
 }
 
 /// new account path
-pub fn create_account_path<'a, T: ?Sized, C, K>(
-	w: &mut T,
+pub fn create_account_path<C, K>(
+	w: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	label: &str,
 ) -> Result<Identifier, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	keys::new_acct_path(&mut *w, keychain_mask, label)
 }
 
 /// set active account
-pub fn set_active_account<'a, T: ?Sized, C, K>(w: &mut T, label: &str) -> Result<(), Error>
+pub fn set_active_account<C, K>(w: &mut WalletBackend<C, K>, label: &str) -> Result<(), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	w.set_parent_key_id_by_name(label)
 }
@@ -196,7 +192,7 @@ where
 			dec_key: None,
 		});
 		let slatepack = packer.deser_slatepack(slatepack.as_bytes(), true)?;
-		return packer.get_slate(&slatepack);
+		packer.get_slate(&slatepack)
 	} else {
 		for index in secret_indices {
 			let dec_key = Some(get_slatepack_secret_key(
@@ -218,11 +214,11 @@ where
 			};
 			return packer.get_slate(&slatepack);
 		}
-		return Err(Error::SlatepackDecryption(
+		Err(Error::SlatepackDecryption(
 			"Could not decrypt slatepack with any provided index on the address derivation path"
 				.to_owned(),
 		)
-		.into());
+		.into())
 	}
 }
 
@@ -302,13 +298,7 @@ where
 
 	Ok((
 		validated,
-		updater::retrieve_outputs(
-			&mut **w,
-			keychain_mask,
-			include_spent,
-			tx_id,
-			Some(&parent_key_id),
-		)?,
+		updater::retrieve_outputs(w, keychain_mask, include_spent, tx_id, Some(&parent_key_id))?,
 	))
 }
 
@@ -341,7 +331,7 @@ where
 	wallet_lock!(wallet_inst, w);
 	let parent_key_id = w.parent_key_id();
 	let txs = updater::retrieve_txs(
-		&mut **w,
+		w,
 		tx_id,
 		tx_slate_id,
 		query_args,
@@ -378,7 +368,7 @@ where
 
 	wallet_lock!(wallet_inst, w);
 	let parent_key_id = w.parent_key_id();
-	let wallet_info = updater::retrieve_info(&mut **w, &parent_key_id, minimum_confirmations)?;
+	let wallet_info = updater::retrieve_info(w, &parent_key_id, minimum_confirmations)?;
 	Ok((validated, wallet_info))
 }
 
@@ -469,8 +459,8 @@ where
 		}
 	};
 	Ok(PaymentProof {
-		amount: amount,
-		excess: excess,
+		amount,
+		excess,
 		recipient_address: SlatepackAddress::new(&proof.receiver_address),
 		recipient_sig: r_sig,
 		sender_address: SlatepackAddress::new(&proof.sender_address),
@@ -479,16 +469,15 @@ where
 }
 
 /// Initiate tx as sender
-pub fn init_send_tx<'a, T: ?Sized, C, K>(
-	w: &mut T,
+pub fn init_send_tx<C, K>(
+	w: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	args: InitTxArgs,
 	use_test_rng: bool,
 ) -> Result<Slate, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let parent_key_id = match &args.src_acct_name {
 		Some(d) => {
@@ -595,16 +584,15 @@ where
 }
 
 /// Initiate a transaction as the recipient (invoicing)
-pub fn issue_invoice_tx<'a, T: ?Sized, C, K>(
-	w: &mut T,
+pub fn issue_invoice_tx<C, K>(
+	w: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	args: IssueInvoiceTxArgs,
 	use_test_rng: bool,
 ) -> Result<Slate, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let parent_key_id = match args.dest_acct_name {
 		Some(d) => {
@@ -648,17 +636,16 @@ where
 
 /// Receive an invoice tx, essentially adding inputs to whatever
 /// output was specified
-pub fn process_invoice_tx<'a, T: ?Sized, C, K>(
-	w: &mut T,
+pub fn process_invoice_tx<C, K>(
+	w: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	slate: &Slate,
 	args: InitTxArgs,
 	use_test_rng: bool,
 ) -> Result<Slate, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let mut ret_slate = slate.clone();
 	check_ttl(w, &ret_slate)?;
@@ -769,15 +756,14 @@ where
 }
 
 /// Lock sender outputs
-pub fn tx_lock_outputs<'a, T: ?Sized, C, K>(
-	w: &mut T,
+pub fn tx_lock_outputs<C, K>(
+	w: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	slate: &Slate,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let context = w.get_private_context(keychain_mask, slate.id.as_bytes())?;
 	let mut excess_override = None;
@@ -806,15 +792,14 @@ where
 }
 
 /// Finalize slate
-pub fn finalize_tx<'a, T: ?Sized, C, K>(
-	w: &mut T,
+pub fn finalize_tx<C, K>(
+	w: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	slate: &Slate,
 ) -> Result<Slate, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	foreign_finalize(w, keychain_mask, slate, false)
 }
@@ -844,20 +829,19 @@ where
 	}
 	wallet_lock!(wallet_inst, w);
 	let parent_key_id = w.parent_key_id();
-	tx::cancel_tx(&mut **w, keychain_mask, &parent_key_id, tx_id, tx_slate_id)
+	tx::cancel_tx(w, keychain_mask, &parent_key_id, tx_id, tx_slate_id)
 }
 
 /// get stored tx
 /// crashes if stored tx has total fees exceeding 2^40 nanogrin
-pub fn get_stored_tx<'a, T: ?Sized, C, K>(
-	w: &T,
+pub fn get_stored_tx<C, K>(
+	w: &WalletBackend<C, K>,
 	tx_id: Option<u32>,
 	slate_id: Option<&Uuid>,
 ) -> Result<Option<Slate>, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let mut uuid = None;
 	if let Some(i) = tx_id {
@@ -896,9 +880,9 @@ where
 
 /// Posts a transaction to the chain
 /// take a client impl instead of wallet so as not to have to lock the wallet
-pub fn post_tx<'a, C>(client: &C, tx: &Transaction, fluff: bool) -> Result<(), Error>
+pub fn post_tx<C>(client: &C, tx: &Transaction, fluff: bool) -> Result<(), Error>
 where
-	C: NodeClient + 'a,
+	C: NodeClient,
 {
 	let res = client.post_tx(tx, fluff);
 	if let Err(e) = res {
@@ -930,8 +914,7 @@ where
 	let is_hex = rewind_hash.chars().all(|c| c.is_ascii_hexdigit());
 	let rewind_hash = rewind_hash.to_lowercase();
 	if !(is_hex && rewind_hash.len() == 64) {
-		let msg = format!("Invalid Rewind Hash");
-		return Err(Error::RewindHash(msg));
+		return Err(Error::RewindHash("Invalid Rewind Hash".to_string()));
 	}
 
 	let tip = {
@@ -939,10 +922,7 @@ where
 		w.w2n_client().get_chain_tip()?
 	};
 
-	let start_height = match start_height {
-		Some(h) => h,
-		None => 1,
-	};
+	let start_height = start_height.unwrap_or_else(|| 1);
 
 	let info = scan::scan_rewind_hash(
 		wallet_inst,
@@ -1030,10 +1010,7 @@ where
 		}),
 		Err(_) => {
 			let outputs = retrieve_outputs(wallet_inst, keychain_mask, &None, true, false, None)?;
-			let height = match outputs.1.iter().map(|m| m.output.height).max() {
-				Some(height) => height,
-				None => 0,
-			};
+			let height = outputs.1.iter().map(|m| m.output.height).max().unwrap_or_else(|| 0);
 			Ok(NodeHeightResult {
 				height,
 				header_hash: "".to_owned(),
@@ -1093,7 +1070,7 @@ where
 	// Step 2: Update outstanding transactions with no change outputs by kernel
 	let mut txs = {
 		wallet_lock!(wallet_inst, w);
-		updater::retrieve_txs(&mut **w, None, None, None, Some(&parent_key_id), true)?
+		updater::retrieve_txs(w, None, None, None, Some(&parent_key_id), true)?
 	};
 	result = update_txs_via_kernel(wallet_inst.clone(), keychain_mask, &mut txs)?;
 	if !result {
@@ -1186,7 +1163,7 @@ where
 			if tip.0 >= e {
 				wallet_lock!(wallet_inst, w);
 				let parent_key_id = w.parent_key_id();
-				tx::cancel_tx(&mut **w, keychain_mask, &parent_key_id, Some(tx.id), None)?;
+				tx::cancel_tx(w, keychain_mask, &parent_key_id, Some(tx.id), None)?;
 			}
 		}
 	}
@@ -1195,11 +1172,10 @@ where
 }
 
 /// Check TTL
-pub fn check_ttl<'a, T: ?Sized, C, K>(w: &mut T, slate: &Slate) -> Result<(), Error>
+pub fn check_ttl<C, K>(w: &mut WalletBackend<C, K>, slate: &Slate) -> Result<(), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	// Refuse if TTL is expired
 	let last_confirmed_height = w.last_confirmed_height()?;
@@ -1265,7 +1241,7 @@ where
 		return Err(Error::PaymentProof("Invalid sender signature".to_owned()));
 	};
 
-	// for now, simple test as to whether one of the addresses belongs to this wallet
+	// for now, simple test whether one of the addresses belongs to this wallet
 	let sec_key = address::address_from_derivation_path(&keychain, &parent_key_id, 0)?;
 	let d_skey = match DalekSecretKey::from_bytes(&sec_key.0) {
 		Ok(k) => k,
@@ -1294,7 +1270,7 @@ where
 {
 	wallet_lock!(wallet_inst, w);
 	let parent_key_id = w.parent_key_id();
-	match updater::refresh_outputs(&mut **w, keychain_mask, &parent_key_id, update_all) {
+	match updater::refresh_outputs(w, keychain_mask, &parent_key_id, update_all) {
 		Ok(_) => Ok(true),
 		Err(e) => {
 			if let Error::InvalidKeychainMask = e {
@@ -1361,16 +1337,15 @@ where
 }
 
 /// Builds an output for the wallet's next available key
-pub fn build_output<'a, T: ?Sized, C, K>(
-	w: &mut T,
+pub fn build_output<C, K>(
+	w: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	features: OutputFeatures,
 	amount: u64,
 ) -> Result<BuiltOutput, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let k = w.keychain(keychain_mask)?;
 
@@ -1394,14 +1369,14 @@ where
 
 	Ok(BuiltOutput {
 		blind: BlindingFactor::from_secret_key(blind),
-		key_id: key_id,
-		output: output,
+		key_id,
+		output,
 	})
 }
 
 /// Create MXMixnet request
-pub fn create_mwixnet_req<'a, T: ?Sized, C, K>(
-	w: &mut T,
+pub fn create_mwixnet_req<C, K>(
+	w: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	params: &MixnetReqCreationParams,
 	commitment: &Commitment,
@@ -1409,9 +1384,8 @@ pub fn create_mwixnet_req<'a, T: ?Sized, C, K>(
 	use_test_rng: bool,
 ) -> Result<SwapReq, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let parent_key_id = w.parent_key_id();
 	let keychain = w.keychain(keychain_mask)?;

libwallet/src/backend.rs

@@ -0,0 +1,779 @@
+// Copyright 2021 The Grin Developers
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use byteorder::{BigEndian, WriteBytesExt};
+use std::fs;
+use std::fs::File;
+use std::io::{Read, Write};
+use std::path::Path;
+use uuid::Uuid;
+
+use crate::blake2::blake2b::{Blake2b, Blake2bResult};
+
+use crate::{
+	AcctPathMapping, Context, Error, NodeClient, OutputData, ScannedBlockInfo, TxLogEntry,
+	WalletInitStatus,
+};
+use grin_core::core::Transaction;
+use grin_core::ser;
+use grin_keychain::{ChildNumber, ExtKeychain, Identifier, Keychain, SwitchCommitmentType};
+use grin_store::{option_to_not_found, Store};
+use grin_util::secp::constants::SECRET_KEY_SIZE;
+use grin_util::secp::SecretKey;
+use grin_util::ToHex;
+use rand::rngs::mock::StepRng;
+use rand::thread_rng;
+
+pub const DB_DIR: &str = "db";
+pub const TX_SAVE_DIR: &str = "saved_txs";
+
+const OUTPUT_PREFIX: u8 = b'o';
+const DERIV_PREFIX: u8 = b'd';
+const CONFIRMED_HEIGHT_PREFIX: u8 = b'c';
+const PRIVATE_TX_CONTEXT_PREFIX: u8 = b'p';
+const TX_LOG_ENTRY_PREFIX: u8 = b't';
+const TX_LOG_ID_PREFIX: u8 = b'i';
+const ACCOUNT_PATH_MAPPING_PREFIX: u8 = b'a';
+const LAST_SCANNED_BLOCK: u8 = b'l';
+const LAST_SCANNED_KEY: &str = "LAST_SCANNED_KEY";
+const WALLET_INIT_STATUS: u8 = b'w';
+const WALLET_INIT_STATUS_KEY: &str = "WALLET_INIT_STATUS";
+
+const DB_PREFIXES: [u8; 9] = [
+	OUTPUT_PREFIX,
+	DERIV_PREFIX,
+	CONFIRMED_HEIGHT_PREFIX,
+	PRIVATE_TX_CONTEXT_PREFIX,
+	TX_LOG_ENTRY_PREFIX,
+	TX_LOG_ID_PREFIX,
+	ACCOUNT_PATH_MAPPING_PREFIX,
+	LAST_SCANNED_BLOCK,
+	WALLET_INIT_STATUS,
+];
+
+/// Helper to derive XOR keys for storing private transaction keys in the DB
+/// (blind_xor_key, nonce_xor_key)
+fn private_ctx_xor_keys<K>(
+	keychain: &K,
+	slate_id: &[u8],
+) -> Result<([u8; SECRET_KEY_SIZE], [u8; SECRET_KEY_SIZE]), Error>
+where
+	K: Keychain,
+{
+	let root_key = keychain.derive_key(0, &K::root_key_id(), SwitchCommitmentType::Regular)?;
+
+	// derive XOR values for storing secret values in DB
+	// h(root_key|slate_id|"blind")
+	let mut hasher = Blake2b::new(SECRET_KEY_SIZE);
+	hasher.update(&root_key.0[..]);
+	hasher.update(&slate_id[..]);
+	hasher.update(&b"blind"[..]);
+	let blind_xor_key = hasher.finalize();
+	let mut ret_blind = [0; SECRET_KEY_SIZE];
+	ret_blind.copy_from_slice(&blind_xor_key.as_bytes()[0..SECRET_KEY_SIZE]);
+
+	// h(root_key|slate_id|"nonce")
+	let mut hasher = Blake2b::new(SECRET_KEY_SIZE);
+	hasher.update(&root_key.0[..]);
+	hasher.update(&slate_id[..]);
+	hasher.update(&b"nonce"[..]);
+	let nonce_xor_key = hasher.finalize();
+	let mut ret_nonce = [0; SECRET_KEY_SIZE];
+	ret_nonce.copy_from_slice(&nonce_xor_key.as_bytes()[0..SECRET_KEY_SIZE]);
+
+	Ok((ret_blind, ret_nonce))
+}
+
+/// Wallet backend. All functions here expect that the wallet instance
+/// has instantiated itself or stored whatever credentials it needs.
+pub struct WalletBackend<C, K>
+where
+	C: NodeClient,
+	K: Keychain,
+{
+	db: Store,
+	data_file_dir: String,
+	/// Keychain
+	pub keychain: Option<K>,
+	/// Check value for XORed keychain seed
+	pub master_checksum: Box<Option<Blake2bResult>>,
+	/// Parent path to use by default for output operations
+	parent_key_id: Identifier,
+	/// wallet to node client
+	w2n_client: C,
+}
+
+impl<C, K> WalletBackend<C, K>
+where
+	C: NodeClient,
+	K: Keychain,
+{
+	/// Create new wallet backend.
+	pub fn new(data_file_dir: &str, n_client: C) -> Result<Self, Error> {
+		let db_path = Path::new(data_file_dir).join(DB_DIR);
+		fs::create_dir_all(&db_path).expect("Couldn't create wallet backend directory!");
+
+		let stored_tx_path = Path::new(data_file_dir).join(TX_SAVE_DIR);
+		fs::create_dir_all(&stored_tx_path)
+			.expect("Couldn't create wallet backend tx storage directory!");
+
+		let store = Store::new(
+			db_path.to_str().unwrap(),
+			None,
+			Some(DB_DIR),
+			DB_PREFIXES.to_vec(),
+			None,
+			None,
+		)?;
+
+		// Make sure default wallet derivation path always exists
+		// as well as path (so it can be retrieved by batches to know where to store
+		// completed transactions, for reference
+		let default_account = AcctPathMapping {
+			label: "default".to_owned(),
+			path: WalletBackend::<C, K>::default_path(),
+		};
+
+		{
+			let mut batch = store.batch()?;
+			batch.put_ser(
+				Some(ACCOUNT_PATH_MAPPING_PREFIX),
+				default_account.label.as_bytes(),
+				&default_account,
+			)?;
+			batch.commit()?;
+		}
+
+		let res = WalletBackend {
+			db: store,
+			data_file_dir: data_file_dir.to_owned(),
+			keychain: None,
+			master_checksum: Box::new(None),
+			parent_key_id: WalletBackend::<C, K>::default_path(),
+			w2n_client: n_client,
+		};
+		Ok(res)
+	}
+
+	/// Return the default parent wallet path, corresponding to the default account
+	/// in the BIP32 spec. Parent is account 0 at level 2, child output identifiers
+	/// are all at level 3.
+	pub fn default_path() -> Identifier {
+		ExtKeychain::derive_key_id(2, 0, 0, 0, 0)
+	}
+
+	/// Just test to see if database files exist in the current directory. If
+	/// so, use a DB backend for all operations.
+	pub fn exists(data_file_dir: &str) -> bool {
+		let db_path = Path::new(data_file_dir).join(DB_DIR);
+		db_path.exists()
+	}
+
+	/// Set the keychain, which should already be initialized
+	/// Optionally return a token value used to XOR the stored
+	/// key value
+	pub fn set_keychain(
+		&mut self,
+		mut k: K,
+		mask: bool,
+		use_test_rng: bool,
+	) -> Result<Option<SecretKey>, Error> {
+		// store hash of master key, so it can be verified later after unmasking
+		let root_key = k.derive_key(0, &K::root_key_id(), SwitchCommitmentType::Regular)?;
+		let mut hasher = Blake2b::new(SECRET_KEY_SIZE);
+		hasher.update(&root_key.0[..]);
+		self.master_checksum = Box::new(Some(hasher.finalize()));
+
+		let mask_value = {
+			match mask {
+				true => {
+					// Random value that must be XORed against the stored wallet seed
+					// before it is used
+					let mask_value = match use_test_rng {
+						true => {
+							let mut test_rng = StepRng::new(1_234_567_890_u64, 1);
+							SecretKey::new(&k.secp(), &mut test_rng)
+						}
+						false => SecretKey::new(&k.secp(), &mut thread_rng()),
+					};
+					k.mask_master_key(&mask_value)?;
+					Some(mask_value)
+				}
+				false => None,
+			}
+		};
+
+		self.keychain = Some(k);
+		Ok(mask_value)
+	}
+
+	/// Close wallet by removing stored keychain.
+	pub fn close(&mut self) -> Result<(), Error> {
+		self.keychain = None;
+		Ok(())
+	}
+
+	/// Return the keychain being used, cloned with XORed token value
+	/// for temporary use
+	/// Can optionally take a mask value
+	pub fn keychain(&self, mask: Option<&SecretKey>) -> Result<K, Error> {
+		match self.keychain.as_ref() {
+			Some(k) => {
+				let mut k_masked = k.clone();
+				if let Some(m) = mask {
+					k_masked.mask_master_key(m)?;
+				}
+				// Check if master seed is what is expected (especially if it's been xored)
+				let root_key =
+					k_masked.derive_key(0, &K::root_key_id(), SwitchCommitmentType::Regular)?;
+				let mut hasher = Blake2b::new(SECRET_KEY_SIZE);
+				hasher.update(&root_key.0[..]);
+				if *self.master_checksum != Some(hasher.finalize()) {
+					error!("Supplied keychain mask is invalid");
+					return Err(Error::InvalidKeychainMask);
+				}
+				Ok(k_masked)
+			}
+			None => Err(Error::KeychainDoesntExist),
+		}
+	}
+
+	/// Return the client being used to communicate with the node.
+	pub fn w2n_client(&mut self) -> &mut C {
+		&mut self.w2n_client
+	}
+
+	/// Return the version of the commit for caching if allowed.
+	pub fn calc_commit_for_cache(
+		&mut self,
+		keychain_mask: Option<&SecretKey>,
+		amount: u64,
+		id: &Identifier,
+	) -> Result<Option<String>, Error> {
+		//TODO: Check if this is really necessary, it's the only thing
+		//preventing removing the need for config in the wallet backend
+		/*if self.config.no_commit_cache == Some(true) {
+			Ok(None)
+		} else {*/
+		Ok(Some(
+			self.keychain(keychain_mask)?
+				.commit(amount, &id, SwitchCommitmentType::Regular)?
+				.0
+				.to_vec()
+				.to_hex(), // TODO: proper support for different switch commitment schemes
+		))
+		/*}*/
+	}
+
+	/// Set parent key id by stored account name.
+	pub fn set_parent_key_id_by_name(&mut self, label: &str) -> Result<(), Error> {
+		let label = label.to_owned();
+		let res = self.acct_path_iter().find(|l| l.label == label);
+		if let Some(a) = res {
+			self.set_parent_key_id(a.path);
+			Ok(())
+		} else {
+			Err(Error::UnknownAccountLabel(label))
+		}
+	}
+
+	/// The BIP32 path of the parent path to use for all output-related
+	/// functions, essentially 'accounts' within a wallet.
+	pub fn set_parent_key_id(&mut self, id: Identifier) {
+		self.parent_key_id = id;
+	}
+
+	/// Get the parent path.
+	pub fn parent_key_id(&mut self) -> Identifier {
+		self.parent_key_id.clone()
+	}
+
+	/// Get output data by id.
+	pub fn get(&self, id: &Identifier, mmr_index: &Option<u64>) -> Result<OutputData, Error> {
+		let key = match mmr_index {
+			Some(i) => to_key_u64(id.to_bytes(), *i),
+			None => id.to_bytes().to_vec(),
+		};
+		option_to_not_found(self.db.get_ser(Some(OUTPUT_PREFIX), &key, None), || {
+			format!("Key Id: {}", id)
+		})
+		.map_err(|e| e.into())
+	}
+
+	/// Iterate over all output data stored by the backend.
+	pub fn iter<'a>(&'a self) -> Box<dyn Iterator<Item = OutputData> + 'a> {
+		let protocol_version = self.db.protocol_version();
+		let prefix_iter = self.db.iter(Some(OUTPUT_PREFIX), move |_, mut v| {
+			ser::deserialize(
+				&mut v,
+				protocol_version,
+				ser::DeserializationMode::default(),
+			)
+			.map_err(From::from)
+		});
+		let iter = prefix_iter
+			.expect("deserialize")
+			.into_iter()
+			.filter(|x| x.is_ok())
+			.map(|x| x.unwrap());
+		Box::new(iter)
+	}
+
+	/// Get an (Optional) tx log entry by uuid.
+	pub fn get_tx_log_entry(&self, u: &Uuid) -> Result<Option<TxLogEntry>, Error> {
+		self.db
+			.get_ser(Some(TX_LOG_ENTRY_PREFIX), u.as_bytes(), None)
+			.map_err(|e| e.into())
+	}
+
+	/// Iterate over all tx log data stored by the backend.
+	pub fn tx_log_iter<'a>(&'a self) -> Box<dyn Iterator<Item = TxLogEntry> + 'a> {
+		let protocol_version = self.db.protocol_version();
+		let prefix_iter = self.db.iter(Some(TX_LOG_ENTRY_PREFIX), move |_, mut v| {
+			ser::deserialize(
+				&mut v,
+				protocol_version,
+				ser::DeserializationMode::default(),
+			)
+			.map_err(From::from)
+		});
+		let iter = prefix_iter
+			.expect("deserialize")
+			.into_iter()
+			.filter(|x| x.is_ok())
+			.map(|x| x.unwrap());
+		Box::new(iter)
+	}
+
+	/// Retrieve the private context associated with a given slate id.
+	pub fn get_private_context(
+		&mut self,
+		keychain_mask: Option<&SecretKey>,
+		slate_id: &[u8],
+	) -> Result<Context, Error> {
+		let ctx_key = to_key_u64(slate_id, 0);
+		let (blind_xor_key, nonce_xor_key) =
+			private_ctx_xor_keys(&self.keychain(keychain_mask)?, slate_id)?;
+
+		let mut ctx: Context = option_to_not_found(
+			self.db
+				.get_ser(Some(PRIVATE_TX_CONTEXT_PREFIX), &ctx_key, None),
+			|| format!("Slate id: {:x?}", slate_id.to_vec()),
+		)?;
+
+		for i in 0..SECRET_KEY_SIZE {
+			ctx.sec_key.0[i] ^= blind_xor_key[i];
+			ctx.sec_nonce.0[i] ^= nonce_xor_key[i];
+		}
+
+		Ok(ctx)
+	}
+
+	/// Iterate over all stored account paths.
+	pub fn acct_path_iter<'a>(&'a self) -> Box<dyn Iterator<Item = AcctPathMapping> + 'a> {
+		let protocol_version = self.db.protocol_version();
+		let prefix_iter = self
+			.db
+			.iter(Some(ACCOUNT_PATH_MAPPING_PREFIX), move |_, mut v| {
+				ser::deserialize(
+					&mut v,
+					protocol_version,
+					ser::DeserializationMode::default(),
+				)
+				.map_err(From::from)
+			});
+		let iter = prefix_iter
+			.expect("deserialize")
+			.into_iter()
+			.filter(|x| x.is_ok())
+			.map(|x| x.unwrap());
+		Box::new(iter)
+	}
+
+	/// Gets an account path for a given label.
+	pub fn get_acct_path(&self, label: String) -> Result<Option<AcctPathMapping>, Error> {
+		self.db
+			.get_ser(Some(ACCOUNT_PATH_MAPPING_PREFIX), label.as_bytes(), None)
+			.map_err(|e| e.into())
+	}
+
+	/// Stores a transaction.
+	pub fn store_tx(&self, uuid: &str, tx: &Transaction) -> Result<(), Error> {
+		let filename = format!("{}.grintx", uuid);
+		let path = Path::new(&self.data_file_dir)
+			.join(TX_SAVE_DIR)
+			.join(filename);
+		let path_buf = Path::new(&path).to_path_buf();
+		let mut stored_tx = File::create(path_buf)?;
+		let tx_hex = ser::ser_vec(tx, ser::ProtocolVersion(1)).unwrap().to_hex();
+		stored_tx.write_all(&tx_hex.as_bytes())?;
+		stored_tx.sync_all()?;
+		Ok(())
+	}
+
+	/// Retrieves a stored transaction.
+	//TODO: Store content of .grintx file at TxLogEntry?
+	pub fn get_stored_tx(&self, uuid: &str) -> Result<Option<Transaction>, Error> {
+		let filename = format!("{}.grintx", uuid);
+		let path = Path::new(&self.data_file_dir)
+			.join(TX_SAVE_DIR)
+			.join(filename);
+		let tx_file = Path::new(&path).to_path_buf();
+		let mut tx_f = File::open(tx_file)?;
+		let mut content = String::new();
+		tx_f.read_to_string(&mut content)?;
+		let tx_bin = grin_util::from_hex(&content).unwrap();
+		Ok(Some(
+			ser::deserialize(
+				&mut &tx_bin[..],
+				ser::ProtocolVersion(1),
+				ser::DeserializationMode::default(),
+			)
+			.unwrap(),
+		))
+	}
+
+	/// Create a new write batch to update or remove output data.
+	pub fn batch(
+		&mut self,
+		keychain_mask: Option<&SecretKey>,
+	) -> Result<WalletBatch<'_, K>, Error> {
+		Ok(WalletBatch {
+			db: self.db.batch()?,
+			keychain: Some(self.keychain(keychain_mask)?),
+		})
+	}
+
+	/// Batch for use when keychain isn't available or required.
+	pub fn batch_no_mask(&mut self) -> Result<WalletBatch<'_, K>, Error> {
+		Ok(WalletBatch {
+			db: self.db.batch()?,
+			keychain: None,
+		})
+	}
+
+	/// Return the current child index.
+	pub fn current_child_index(&mut self, parent_key_id: &Identifier) -> Result<u32, Error> {
+		let index = {
+			let batch = self.db.batch()?;
+			batch
+				.get_ser(Some(DERIV_PREFIX), &parent_key_id.to_bytes(), None)?
+				.unwrap_or_else(|| 0)
+		};
+		Ok(index)
+	}
+
+	/// Next child ID when we want to create a new output, based on current parent.
+	pub fn next_child(
+		&mut self,
+		keychain_mask: Option<&SecretKey>,
+	) -> Result<Identifier, Error> {
+		let parent_key_id = self.parent_key_id.clone();
+		let mut deriv_idx = {
+			let batch = self.db.batch()?;
+			batch
+				.get_ser(Some(DERIV_PREFIX), &self.parent_key_id.to_bytes(), None)?
+				.unwrap_or_else(|| 0)
+		};
+		let mut return_path = self.parent_key_id.to_path();
+		return_path.depth += 1;
+		return_path.path[return_path.depth as usize - 1] = ChildNumber::from(deriv_idx);
+		deriv_idx += 1;
+		let mut batch = self.batch(keychain_mask)?;
+		batch.save_child_index(&parent_key_id, deriv_idx)?;
+		batch.commit()?;
+		Ok(Identifier::from_path(&return_path))
+	}
+
+	/// Last verified height of outputs directly descending from the given parent key.
+	pub fn last_confirmed_height(&mut self) -> Result<u64, Error> {
+		let batch = self.db.batch()?;
+		let last_confirmed_height = batch
+			.get_ser(
+				Some(CONFIRMED_HEIGHT_PREFIX),
+				&self.parent_key_id.to_bytes(),
+				None,
+			)?
+			.unwrap_or_else(|| 0);
+		Ok(last_confirmed_height)
+	}
+
+	/// Last block scanned during scan or restore.
+	pub fn last_scanned_block(&mut self) -> Result<ScannedBlockInfo, Error> {
+		let batch = self.db.batch()?;
+		let last_scanned_block = batch
+			.get_ser(Some(LAST_SCANNED_BLOCK), LAST_SCANNED_KEY.as_bytes(), None)?
+			.unwrap_or_else(|| ScannedBlockInfo {
+				height: 0,
+				hash: "".to_owned(),
+				start_pmmr_index: 0,
+				last_pmmr_index: 0,
+			});
+		Ok(last_scanned_block)
+	}
+
+	/// Flag whether the wallet needs a full UTXO scan on next update attempt.
+	pub fn init_status(&mut self) -> Result<WalletInitStatus, Error> {
+		let batch = self.db.batch()?;
+		let status = batch
+			.get_ser(
+				Some(WALLET_INIT_STATUS),
+				WALLET_INIT_STATUS_KEY.as_bytes(),
+				None,
+			)?
+			.unwrap_or_else(|| WalletInitStatus::InitComplete);
+		Ok(status)
+	}
+}
+
+/// An atomic batch in which all changes can be committed all at once or
+/// discarded on error.
+pub struct WalletBatch<'a, K>
+where
+	K: Keychain,
+{
+	db: grin_store::Batch<'a>,
+	/// Keychain
+	keychain: Option<K>,
+}
+
+#[allow(missing_docs)]
+impl<'a, K> WalletBatch<'a, K>
+where
+	K: Keychain,
+{
+	/// Return the keychain being used.
+	pub fn keychain(&mut self) -> &mut K {
+		self.keychain.as_mut().unwrap()
+	}
+
+	/// Add or update data about an output to the backend.
+	pub fn save(&mut self, out: OutputData) -> Result<(), Error> {
+		let key = match out.mmr_index {
+			Some(i) => to_key_u64(out.key_id.to_bytes(), i),
+			None => out.key_id.to_bytes().to_vec(),
+		};
+		self.db.put_ser(Some(OUTPUT_PREFIX), &key, &out)?;
+		Ok(())
+	}
+
+	/// Gets output data by id
+	pub fn get(&self, id: &Identifier, mmr_index: &Option<u64>) -> Result<OutputData, Error> {
+		let key = match mmr_index {
+			Some(i) => to_key_u64(id.to_bytes(), *i),
+			None => id.to_bytes().to_vec(),
+		};
+		option_to_not_found(self.db.get_ser(Some(OUTPUT_PREFIX), &key, None), || {
+			format!("Key ID: {}", id)
+		})
+		.map_err(|e| e.into())
+	}
+
+	/// Iterate over all output data stored by the backend.
+	pub fn iter(&'a self) -> impl Iterator<Item = OutputData> + 'a {
+		let protocol_version = self.db.protocol_version();
+		let prefix_iter = self.db.iter(Some(OUTPUT_PREFIX), move |_, mut v| {
+			ser::deserialize(
+				&mut v,
+				protocol_version,
+				ser::DeserializationMode::default(),
+			)
+			.map_err(From::from)
+		});
+		let iter = prefix_iter
+			.expect("deserialize")
+			.into_iter()
+			.filter(|x| x.is_ok())
+			.map(|x| x.unwrap());
+		iter
+	}
+
+	/// Delete data about an output from the backend.
+	pub fn delete(&mut self, id: &Identifier, mmr_index: &Option<u64>) -> Result<(), Error> {
+		// Delete the output data.
+		let key = match mmr_index {
+			Some(i) => to_key_u64(id.to_bytes(), *i),
+			None => id.to_bytes().to_vec(),
+		};
+		self.db.delete(Some(OUTPUT_PREFIX), &key)?;
+		Ok(())
+	}
+
+	/// Save last stored child index of a given parent.
+	pub fn save_child_index(&mut self, parent_id: &Identifier, child_n: u32) -> Result<(), Error> {
+		self.db
+			.put_ser(Some(DERIV_PREFIX), &parent_id.to_bytes(), &child_n)?;
+		Ok(())
+	}
+
+	/// Save last confirmed height of outputs for a given parent.
+	pub fn save_last_confirmed_height(
+		&mut self,
+		parent_key_id: &Identifier,
+		height: u64,
+	) -> Result<(), Error> {
+		self.db.put_ser(
+			Some(CONFIRMED_HEIGHT_PREFIX),
+			&parent_key_id.to_bytes(),
+			&height,
+		)?;
+		Ok(())
+	}
+
+	/// Save the last PMMR index that was scanned via a scan operation.
+	pub fn save_last_scanned_block(&mut self, block_info: ScannedBlockInfo) -> Result<(), Error> {
+		self.db.put_ser(
+			Some(LAST_SCANNED_BLOCK),
+			LAST_SCANNED_KEY.as_bytes(),
+			&block_info,
+		)?;
+		Ok(())
+	}
+
+	/// Save flag indicating whether wallet needs a full UTXO scan.
+	pub fn save_init_status(&mut self, value: WalletInitStatus) -> Result<(), Error> {
+		self.db.put_ser(
+			Some(WALLET_INIT_STATUS),
+			WALLET_INIT_STATUS_KEY.as_bytes(),
+			&value,
+		)?;
+		Ok(())
+	}
+
+	/// Get next transaction log entry for the parent.
+	pub fn next_tx_log_id(&mut self, parent_key_id: &Identifier) -> Result<u32, Error> {
+		let last_tx_log_id = self
+			.db
+			.get_ser(Some(TX_LOG_ID_PREFIX), &parent_key_id.to_bytes(), None)?
+			.unwrap_or_else(|| 0);
+		self.db.put_ser(
+			Some(TX_LOG_ID_PREFIX),
+			&parent_key_id.to_bytes(),
+			&(last_tx_log_id + 1),
+		)?;
+		Ok(last_tx_log_id)
+	}
+
+	/// Iterate over transactions data stored by the backend.
+	pub fn tx_log_iter(&'a self) -> impl Iterator<Item = TxLogEntry> + 'a {
+		let protocol_version = self.db.protocol_version();
+		let prefix_iter = self.db.iter(Some(TX_LOG_ENTRY_PREFIX), move |_, mut v| {
+			ser::deserialize(
+				&mut v,
+				protocol_version,
+				ser::DeserializationMode::default(),
+			)
+			.map_err(From::from)
+		});
+		let iter = prefix_iter
+			.expect("deserialize")
+			.into_iter()
+			.filter(|x| x.is_ok())
+			.map(|x| x.unwrap());
+		iter
+	}
+
+	/// Save a transaction log entry.
+	pub fn save_tx_log_entry(
+		&mut self,
+		tx_in: TxLogEntry,
+		parent_id: &Identifier,
+	) -> Result<(), Error> {
+		let tx_log_key = to_key_u64(parent_id.to_bytes(), tx_in.id as u64);
+		self.db
+			.put_ser(Some(TX_LOG_ENTRY_PREFIX), &tx_log_key, &tx_in)?;
+		Ok(())
+	}
+
+	/// Delete a transaction log entry.
+	pub fn delete_tx_log_entry(&mut self, tx_id: u32, parent_id: &Identifier) -> Result<(), Error> {
+		let tx_log_key = to_key_u64(parent_id.to_bytes(), tx_id as u64);
+		self.db.delete(Some(TX_LOG_ENTRY_PREFIX), &tx_log_key)?;
+		Ok(())
+	}
+
+	/// Save an account label -> path mapping.
+	pub fn save_acct_path(&mut self, mapping: AcctPathMapping) -> Result<(), Error> {
+		self.db.put_ser(
+			Some(ACCOUNT_PATH_MAPPING_PREFIX),
+			mapping.label.as_bytes(),
+			&mapping,
+		)?;
+		Ok(())
+	}
+
+	/// Iterate over account names stored in backend.
+	pub fn acct_path_iter(&'a self) -> impl Iterator<Item = AcctPathMapping> + 'a {
+		let protocol_version = self.db.protocol_version();
+		let prefix_iter = self
+			.db
+			.iter(Some(ACCOUNT_PATH_MAPPING_PREFIX), move |_, mut v| {
+				ser::deserialize(
+					&mut v,
+					protocol_version,
+					ser::DeserializationMode::default(),
+				)
+				.map_err(From::from)
+			});
+		let iter = prefix_iter
+			.expect("deserialize")
+			.into_iter()
+			.filter(|x| x.is_ok())
+			.map(|x| x.unwrap());
+		iter
+	}
+
+	/// Save an output as locked in the backend.
+	pub fn lock_output(&mut self, out: &mut OutputData) -> Result<(), Error> {
+		out.lock();
+		self.save(out.clone())
+	}
+
+	/// Save the private context associated with a slate id.
+	pub fn save_private_context(&mut self, slate_id: &[u8], ctx: &Context) -> Result<(), Error> {
+		let ctx_key = to_key_u64(slate_id, 0);
+		let (blind_xor_key, nonce_xor_key) = private_ctx_xor_keys(self.keychain(), slate_id)?;
+
+		let mut s_ctx = ctx.clone();
+		for i in 0..SECRET_KEY_SIZE {
+			s_ctx.sec_key.0[i] ^= blind_xor_key[i];
+			s_ctx.sec_nonce.0[i] ^= nonce_xor_key[i];
+		}
+
+		self.db
+			.put_ser(Some(PRIVATE_TX_CONTEXT_PREFIX), &ctx_key, &s_ctx)?;
+		Ok(())
+	}
+
+	/// Delete the private context associated with the slate id.
+	pub fn delete_private_context(&mut self, slate_id: &[u8]) -> Result<(), Error> {
+		let ctx_key = to_key_u64(slate_id, 0);
+		self.db
+			.delete(Some(PRIVATE_TX_CONTEXT_PREFIX), &ctx_key)
+			.map_err(|e| e.into())
+	}
+
+	/// Write the wallet data to backend file.
+	pub fn commit(self) -> Result<(), Error> {
+		self.db.commit()?;
+		Ok(())
+	}
+}
+
+/// Build a db key from a byte vector identifier and numeric identifier
+fn to_key_u64<K: AsRef<[u8]>>(k: K, val: u64) -> Vec<u8> {
+	let mut res = k.as_ref().to_vec();
+	res.write_u64::<BigEndian>(val).unwrap();
+	res
+}

libwallet/src/internal/keys.rs

@@ -16,32 +16,31 @@
 use crate::error::Error;
 use crate::grin_keychain::{ChildNumber, ExtKeychain, Identifier, Keychain};
 use crate::grin_util::secp::key::SecretKey;
-use crate::types::{AcctPathMapping, NodeClient, WalletBackend};
+use crate::types::{AcctPathMapping, NodeClient};
+use crate::WalletBackend;
 
 /// Get next available key in the wallet for a given parent
-pub fn next_available_key<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn next_available_key<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 ) -> Result<Identifier, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let child = wallet.next_child(keychain_mask)?;
 	Ok(child)
 }
 
 /// Retrieve an existing key from a wallet
-pub fn retrieve_existing_key<'a, T: ?Sized, C, K>(
-	wallet: &T,
+pub fn retrieve_existing_key<C, K>(
+	wallet: &WalletBackend<C, K>,
 	key_id: Identifier,
 	mmr_index: Option<u64>,
 ) -> Result<(Identifier, u32), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let existing = wallet.get(&key_id, &mmr_index)?;
 	let key_id = existing.key_id.clone();
@@ -50,25 +49,23 @@ where
 }
 
 /// Returns a list of account to BIP32 path mappings
-pub fn accounts<'a, T: ?Sized, C, K>(wallet: &mut T) -> Result<Vec<AcctPathMapping>, Error>
+pub fn accounts<C, K>(wallet: &WalletBackend<C, K>) -> Result<Vec<AcctPathMapping>, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	Ok(wallet.acct_path_iter().collect())
 }
 
-/// Adds an new parent account path with a given label
-pub fn new_acct_path<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+/// Adds a new parent account path with a given label
+pub fn new_acct_path<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	label: &str,
 ) -> Result<Identifier, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let label = label.to_owned();
 	if wallet.acct_path_iter().any(|l| l.label == label) {
@@ -94,7 +91,7 @@ where
 	};
 
 	let save_path = AcctPathMapping {
-		label: label,
+		label,
 		path: return_id.clone(),
 	};
 
@@ -105,20 +102,19 @@ where
 }
 
 /// Adds/sets a particular account path with a given label
-pub fn set_acct_path<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn set_acct_path<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	label: &str,
 	path: &Identifier,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let label = label.to_owned();
 	let save_path = AcctPathMapping {
-		label: label,
+		label,
 		path: path.clone(),
 	};
 

libwallet/src/internal/scan.rs

@@ -66,14 +66,14 @@ struct RestoredTxStats {
 	pub num_outputs: usize,
 }
 
-fn identify_utxo_outputs<'a, K>(
+fn identify_utxo_outputs<K>(
 	keychain: &K,
 	outputs: Vec<(pedersen::Commitment, pedersen::RangeProof, bool, u64, u64)>,
 	status_send_channel: &Option<Sender<StatusMessage>>,
 	percentage_complete: u8,
 ) -> Result<Vec<OutputResult>, Error>
 where
-	K: Keychain + 'a,
+	K: Keychain,
 {
 	let mut wallet_outputs: Vec<OutputResult> = Vec::new();
 
@@ -137,7 +137,7 @@ where
 			n_child: key_id.to_path().last_path_index(),
 			value: amount,
 			height: *height,
-			lock_height: lock_height,
+			lock_height,
 			is_coinbase: *is_coinbase,
 			mmr_index: *mmr_index,
 		});
@@ -145,7 +145,7 @@ where
 	Ok(wallet_outputs)
 }
 
-fn collect_chain_outputs_rewind_hash<'a, C>(
+fn collect_chain_outputs_rewind_hash<C>(
 	client: C,
 	rewind_hash: String,
 	start_index: u64,
@@ -153,13 +153,13 @@ fn collect_chain_outputs_rewind_hash<'a, C>(
 	status_send_channel: &Option<Sender<StatusMessage>>,
 ) -> Result<ViewWallet, Error>
 where
-	C: NodeClient + 'a,
+	C: NodeClient,
 {
 	let batch_size = 1000;
 	let start_index_stat = start_index;
 	let mut start_index = start_index;
 	let mut vw = ViewWallet {
-		rewind_hash: rewind_hash,
+		rewind_hash,
 		output_result: vec![],
 		total_balance: 0,
 		last_pmmr_index: 0,
@@ -198,7 +198,7 @@ where
 				continue;
 			}
 
-			let info = info.unwrap();
+			let info = info?;
 			vw.total_balance += info.value;
 			let lock_height = if *is_coinbase {
 				*height + global::coinbase_maturity()
@@ -212,7 +212,7 @@ where
 				height: *height,
 				mmr_index: *mmr_index,
 				is_coinbase: *is_coinbase,
-				lock_height: lock_height,
+				lock_height,
 			};
 
 			vw.output_result.push(output_info);
@@ -285,7 +285,6 @@ where
 	Ok((result_vec, last_retrieved_return_index, perc_complete))
 }
 
-///
 fn restore_missing_output<'a, L, C, K>(
 	wallet_inst: Arc<Mutex<Box<dyn WalletInst<'a, L, C, K>>>>,
 	keychain_mask: Option<&SecretKey>,
@@ -384,7 +383,7 @@ where
 	wallet_lock!(wallet_inst, w);
 	let updated_tx_entry = if output.tx_log_entry.is_some() {
 		let entries = updater::retrieve_txs(
-			&mut **w,
+			w,
 			output.tx_log_entry,
 			None,
 			None,
@@ -536,7 +535,7 @@ where
 	// Now, get all outputs owned by this wallet (regardless of account)
 	let wallet_outputs = {
 		wallet_lock!(wallet_inst, w);
-		updater::retrieve_outputs(&mut **w, keychain_mask, true, None, None)?
+		updater::retrieve_outputs(w, keychain_mask, true, None, None)?
 	};
 
 	let mut missing_outs = vec![];
@@ -656,7 +655,7 @@ where
 			if let Some(ref s) = status_send_channel {
 				let _ = s.send(StatusMessage::Scanning(msg, perc_complete));
 			}
-			keys::set_acct_path(&mut **w, keychain_mask, &label, path)?;
+			keys::set_acct_path(w, keychain_mask, &label, path)?;
 			acct_index += 1;
 		}
 		let current_child_index = w.current_child_index(&path)?;

libwallet/src/internal/selection.rs

@@ -14,7 +14,6 @@
 
 //! Selection of inputs for building transactions
 
-use crate::address;
 use crate::error::Error;
 use crate::grin_core::core::amount_to_hr_string;
 use crate::grin_core::libtx::{
@@ -29,6 +28,7 @@ use crate::internal::keys;
 use crate::slate::Slate;
 use crate::types::*;
 use crate::util::OnionV3Address;
+use crate::{address, WalletBackend};
 use std::collections::HashMap;
 use std::convert::TryInto;
 
@@ -37,8 +37,8 @@ use std::convert::TryInto;
 /// and saves the private wallet identifiers of our selected outputs
 /// into our transaction context
 
-pub fn build_send_tx<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn build_send_tx<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain: &K,
 	keychain_mask: Option<&SecretKey>,
 	slate: &mut Slate,
@@ -54,9 +54,8 @@ pub fn build_send_tx<'a, T: ?Sized, C, K>(
 	amount_includes_fee: bool,
 ) -> Result<Context, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let (elems, inputs, change_amounts_derivations, fee) = select_send_tx(
 		wallet,
@@ -73,7 +72,7 @@ where
 	)?;
 	if amount_includes_fee {
 		slate.amount = slate.amount.checked_sub(fee).ok_or(Error::GenericError(
-			format!("Transaction amount is too small to include fee").into(),
+			"Transaction amount is too small to include fee".to_string(),
 		))?;
 	};
 
@@ -119,8 +118,8 @@ where
 
 /// Locks all corresponding outputs in the context, creates
 /// change outputs and tx log entry
-pub fn lock_tx_context<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn lock_tx_context<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	slate: &Slate,
 	current_height: u64,
@@ -128,9 +127,8 @@ pub fn lock_tx_context<'a, T: ?Sized, C, K>(
 	excess_override: Option<pedersen::Commitment>,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let mut output_commits: HashMap<Identifier, (Option<String>, u64)> = HashMap::new();
 	// Store cached commits before locking wallet
@@ -178,7 +176,7 @@ where
 		let mut amount_debited = 0;
 		t.num_inputs = lock_inputs.len();
 		for id in lock_inputs {
-			let mut coin = batch.get(&id.0, &id.1).unwrap();
+			let mut coin = batch.get(&id.0, &id.1)?;
 			coin.tx_log_entry = Some(log_id);
 			amount_debited += coin.value;
 			batch.lock_output(&mut coin)?;
@@ -221,11 +219,11 @@ where
 				root_key_id: parent_key_id.clone(),
 				key_id: id.clone(),
 				n_child: id.to_path().last_path_index(),
-				commit: commit,
+				commit,
 				mmr_index: None,
 				value: change_amount,
 				status: OutputStatus::Unconfirmed,
-				height: height,
+				height,
 				lock_height: 0,
 				is_coinbase: false,
 				tx_log_entry: Some(log_id),
@@ -245,8 +243,8 @@ where
 /// Creates a new output in the wallet for the recipient,
 /// returning the key of the fresh output
 /// Also creates a new transaction containing the output
-pub fn build_recipient_output<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn build_recipient_output<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	slate: &mut Slate,
 	current_height: u64,
@@ -255,9 +253,8 @@ pub fn build_recipient_output<'a, T: ?Sized, C, K>(
 	is_initiator: bool,
 ) -> Result<(Identifier, Context, TxLogEntry), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	// Create a potential output for this transaction
 	let key_id = keys::next_available_key(wallet, keychain_mask).unwrap();
@@ -300,10 +297,10 @@ where
 		key_id: key_id_inner.clone(),
 		mmr_index: None,
 		n_child: key_id_inner.to_path().last_path_index(),
-		commit: commit,
+		commit,
 		value: amount,
 		status: OutputStatus::Unconfirmed,
-		height: height,
+		height,
 		lock_height: 0,
 		is_coinbase: false,
 		tx_log_entry: Some(log_id),
@@ -317,8 +314,8 @@ where
 /// Builds a transaction to send to someone from the HD seed associated with the
 /// wallet and the amount to send. Handles reading through the wallet data file,
 /// selecting outputs to spend and building the change.
-pub fn select_send_tx<'a, T: ?Sized, C, K, B>(
-	wallet: &mut T,
+pub fn select_send_tx<C, K, B>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	amount: u64,
 	amount_includes_fee: bool,
@@ -339,9 +336,8 @@ pub fn select_send_tx<'a, T: ?Sized, C, K, B>(
 	Error,
 >
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 	B: ProofBuild,
 {
 	let (coins, _total, amount, fee) = select_coins_and_fee(
@@ -371,8 +367,8 @@ where
 }
 
 /// Select outputs and calculating fee.
-pub fn select_coins_and_fee<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn select_coins_and_fee<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	amount: u64,
 	amount_includes_fee: bool,
 	current_height: u64,
@@ -391,9 +387,8 @@ pub fn select_coins_and_fee<'a, T: ?Sized, C, K>(
 	Error,
 >
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	// select some spendable coins from the wallet
 	let (max_outputs, mut coins) = select_coins(
@@ -407,7 +402,7 @@ where
 	);
 
 	// sender is responsible for setting the fee on the partial tx
-	// recipient should double check the fee calculation and not blindly trust the
+	// recipient should double-check the fee calculation and not blindly trust the
 	// sender
 
 	// First attempt to spend without change
@@ -422,8 +417,8 @@ where
 		return Err(Error::NotEnoughFunds {
 			available: 0,
 			available_disp: amount_to_hr_string(0, false),
-			needed: amount_with_fee as u64,
-			needed_disp: amount_to_hr_string(amount_with_fee as u64, false),
+			needed: amount_with_fee,
+			needed_disp: amount_to_hr_string(amount_with_fee, false),
 		});
 	}
 
@@ -432,8 +427,8 @@ where
 		return Err(Error::NotEnoughFunds {
 			available: total,
 			available_disp: amount_to_hr_string(total, false),
-			needed: amount_with_fee as u64,
-			needed_disp: amount_to_hr_string(amount_with_fee as u64, false),
+			needed: amount_with_fee,
+			needed_disp: amount_to_hr_string(amount_with_fee, false),
 		});
 	}
 
@@ -453,10 +448,10 @@ where
 			// End the loop if we have selected all the outputs and still not enough funds
 			if coins.len() == max_outputs {
 				return Err(Error::NotEnoughFunds {
-					available: total as u64,
+					available: total,
 					available_disp: amount_to_hr_string(total, false),
-					needed: amount_with_fee as u64,
-					needed_disp: amount_to_hr_string(amount_with_fee as u64, false),
+					needed: amount_with_fee,
+					needed_disp: amount_to_hr_string(amount_with_fee, false),
 				});
 			}
 
@@ -483,7 +478,7 @@ where
 	// be reduced, to accommodate the fee.
 	let new_amount = match amount_includes_fee {
 		true => amount.checked_sub(fee).ok_or(Error::GenericError(
-			format!("Transaction amount is too small to include fee").into(),
+			"Transaction amount is too small to include fee".to_string(),
 		))?,
 		false => amount,
 	};
@@ -491,9 +486,9 @@ where
 }
 
 /// Selects inputs and change for a transaction
-pub fn inputs_and_change<'a, T: ?Sized, C, K, B>(
+pub fn inputs_and_change<C, K, B>(
 	coins: &[OutputData],
-	wallet: &mut T,
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	amount: u64,
 	fee: u64,
@@ -507,9 +502,8 @@ pub fn inputs_and_change<'a, T: ?Sized, C, K, B>(
 	Error,
 >
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 	B: ProofBuild,
 {
 	let mut parts = vec![];
@@ -554,7 +548,7 @@ where
 				part_change
 			};
 
-			let change_key = wallet.next_child(keychain_mask).unwrap();
+			let change_key = wallet.next_child(keychain_mask)?;
 
 			change_amounts_derivations.push((change_amount, change_key.clone(), None));
 			parts.push(build::output(change_amount, change_key));
@@ -569,10 +563,8 @@ where
 /// max_outputs). Alternative strategy is to spend smallest outputs first
 /// but only as many as necessary. When we introduce additional strategies
 /// we should pass something other than a bool in.
-/// TODO: Possibly move this into another trait to be owned by a wallet?
-
-pub fn select_coins<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn select_coins<C, K>(
+	wallet: &WalletBackend<C, K>,
 	amount: u64,
 	current_height: u64,
 	minimum_confirmations: u64,
@@ -582,9 +574,8 @@ pub fn select_coins<'a, T: ?Sized, C, K>(
 ) -> (usize, Vec<OutputData>)
 //    max_outputs_available, Outputs
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	// first find all eligible outputs based on number of confirmations
 	let mut eligible = wallet
@@ -663,21 +654,20 @@ fn select_from(amount: u64, select_all: bool, outputs: Vec<OutputData>) -> Optio
 	}
 }
 
-/// Repopulates output in the slate's tranacstion
+/// Repopulates output in the slate's transaction
 /// with outputs from the stored context
 /// change outputs and tx log entry
 /// Remove the explicitly stored excess
-pub fn repopulate_tx<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn repopulate_tx<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	slate: &mut Slate,
 	context: &Context,
 	update_fee: bool,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	// restore the original amount, fee
 	slate.amount = context.amount;

libwallet/src/internal/tx.rs

@@ -26,10 +26,10 @@ use crate::grin_util::secp::pedersen;
 use crate::grin_util::Mutex;
 use crate::internal::{selection, updater};
 use crate::slate::Slate;
-use crate::types::{Context, NodeClient, StoredProofInfo, TxLogEntryType, WalletBackend};
+use crate::types::{Context, NodeClient, StoredProofInfo, TxLogEntryType};
 use crate::util::OnionV3Address;
-use crate::InitTxArgs;
 use crate::{address, Error};
+use crate::{InitTxArgs, WalletBackend};
 use ed25519_dalek::Keypair as DalekKeypair;
 use ed25519_dalek::PublicKey as DalekPublicKey;
 use ed25519_dalek::SecretKey as DalekSecretKey;
@@ -44,8 +44,8 @@ lazy_static! {
 
 /// Creates a new slate for a transaction, can be called by anyone involved in
 /// the transaction (sender(s), receiver(s))
-pub fn new_tx_slate<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn new_tx_slate<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	amount: u64,
 	is_invoice: bool,
 	num_participants: u8,
@@ -53,9 +53,8 @@ pub fn new_tx_slate<'a, T: ?Sized, C, K>(
 	ttl_blocks: Option<u64>,
 ) -> Result<Slate, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let current_height = wallet.w2n_client().get_chain_tip()?.0;
 	let mut slate = Slate::blank(num_participants, is_invoice);
@@ -92,8 +91,8 @@ where
 }
 
 /// Estimates locked amount and fee for the transaction without creating one
-pub fn estimate_send_tx<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn estimate_send_tx<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	amount: u64,
 	amount_includes_fee: bool,
@@ -110,9 +109,8 @@ pub fn estimate_send_tx<'a, T: ?Sized, C, K>(
 	Error,
 >
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	// Get lock height
 	let current_height = wallet.w2n_client().get_chain_tip()?.0;
@@ -141,8 +139,8 @@ where
 }
 
 /// Add inputs to the slate (effectively becoming the sender)
-pub fn add_inputs_to_slate<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn add_inputs_to_slate<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	slate: &mut Slate,
 	current_height: u64,
@@ -156,9 +154,8 @@ pub fn add_inputs_to_slate<'a, T: ?Sized, C, K>(
 	amount_includes_fee: bool,
 ) -> Result<Context, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	// sender should always refresh outputs
 	updater::refresh_outputs(wallet, keychain_mask, parent_key_id, false)?;
@@ -207,8 +204,8 @@ where
 }
 
 /// Add receiver output to the slate
-pub fn add_output_to_slate<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn add_output_to_slate<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	slate: &mut Slate,
 	current_height: u64,
@@ -217,9 +214,8 @@ pub fn add_output_to_slate<'a, T: ?Sized, C, K>(
 	use_test_rng: bool,
 ) -> Result<Context, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let keychain = wallet.keychain(keychain_mask)?;
 	// create an output using the amount in the slate
@@ -252,8 +248,8 @@ where
 }
 
 /// Create context, without adding inputs to slate
-pub fn create_late_lock_context<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn create_late_lock_context<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	slate: &mut Slate,
 	current_height: u64,
@@ -262,9 +258,8 @@ pub fn create_late_lock_context<'a, T: ?Sized, C, K>(
 	use_test_rng: bool,
 ) -> Result<Context, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	// sender should always refresh outputs
 	updater::refresh_outputs(wallet, keychain_mask, parent_key_id, false)?;
@@ -300,16 +295,15 @@ where
 }
 
 /// Complete a transaction
-pub fn complete_tx<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn complete_tx<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	slate: &mut Slate,
 	context: &Context,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	// when self sending invoice tx, use initiator nonce to finalize
 	let (sec_key, sec_nonce) = {
@@ -333,17 +327,16 @@ where
 }
 
 /// Rollback outputs associated with a transaction in the wallet
-pub fn cancel_tx<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn cancel_tx<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	parent_key_id: &Identifier,
 	tx_id: Option<u32>,
 	tx_slate_id: Option<Uuid>,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let mut tx_id_string = String::new();
 	if let Some(tx_id) = tx_id {
@@ -384,17 +377,16 @@ where
 }
 
 /// Update the stored transaction (this update needs to happen when the TX is finalised)
-pub fn update_stored_tx<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn update_stored_tx<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	context: &Context,
 	slate: &Slate,
 	is_invoiced: bool,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	// finalize command
 	let tx_vec = updater::retrieve_txs(wallet, None, Some(slate.id), None, None, false)?;
@@ -421,10 +413,7 @@ where
 	}
 
 	if let Some(ref p) = slate.clone().payment_proof {
-		let derivation_index = match context.payment_proof_derivation_index {
-			Some(i) => i,
-			None => 0,
-		};
+		let derivation_index = context.payment_proof_derivation_index.unwrap_or_else(|| 0);
 		let keychain = wallet.keychain(keychain_mask)?;
 		let parent_key_id = wallet.parent_key_id();
 		let excess = slate.calc_excess(keychain.secp())?;
@@ -506,17 +495,16 @@ pub fn create_payment_proof_signature(
 }
 
 /// Verify all aspects of a completed payment proof on the current slate
-pub fn verify_slate_payment_proof<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn verify_slate_payment_proof<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	parent_key_id: &Identifier,
 	context: &Context,
 	slate: &Slate,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let tx_vec = updater::retrieve_txs(
 		wallet,

libwallet/src/internal/updater.rs

@@ -30,28 +30,25 @@ use crate::grin_util::secp::key::SecretKey;
 use crate::grin_util::secp::pedersen;
 use crate::grin_util::static_secp_instance;
 use crate::internal::keys;
-use crate::types::{
-	NodeClient, OutputData, OutputStatus, TxLogEntry, TxLogEntryType, WalletBackend, WalletInfo,
-};
+use crate::types::{NodeClient, OutputData, OutputStatus, TxLogEntry, TxLogEntryType, WalletInfo};
 use crate::{
 	BlockFees, CbData, OutputCommitMapping, RetrieveTxQueryArgs, RetrieveTxQuerySortField,
-	RetrieveTxQuerySortOrder,
+	RetrieveTxQuerySortOrder, WalletBackend,
 };
 
 use num_bigint::BigInt;
 
-/// Retrieve all of the outputs (doesn't attempt to update from node)
-pub fn retrieve_outputs<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+/// Retrieve all the outputs (don't attempt to update from node)
+pub fn retrieve_outputs<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	show_spent: bool,
 	tx_id: Option<u32>,
 	parent_key_id: Option<&Identifier>,
 ) -> Result<Vec<OutputCommitMapping>, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	// just read the wallet here, no need for a write lock
 	let mut outputs = wallet
@@ -94,15 +91,14 @@ where
 }
 
 /// Apply advanced filtering to resultset from retrieve_txs below
-pub fn apply_advanced_tx_list_filtering<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn apply_advanced_tx_list_filtering<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	parent_key_id: Option<&Identifier>,
 	query_args: &RetrieveTxQueryArgs,
 ) -> Vec<TxLogEntry>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	// Apply simple bool, GTE or LTE fields
 	let txs_iter: Box<dyn Iterator<Item = TxLogEntry>> = Box::new(
@@ -329,10 +325,10 @@ where
 	return_txs
 }
 
-/// Retrieve all of the transaction entries, or a particular entry
+/// Retrieve all the transaction entries, or a particular entry
 /// if `parent_key_id` is set, only return entries from that key
-pub fn retrieve_txs<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn retrieve_txs<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	tx_id: Option<u32>,
 	tx_slate_id: Option<Uuid>,
 	query_args: Option<RetrieveTxQueryArgs>,
@@ -340,9 +336,8 @@ pub fn retrieve_txs<'a, T: ?Sized, C, K>(
 	outstanding_only: bool,
 ) -> Result<Vec<TxLogEntry>, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let mut txs;
 	// Adding in new transaction list query logic. If `tx_id` or `tx_slate_id`
@@ -384,16 +379,15 @@ where
 
 /// Refreshes the outputs in a wallet with the latest information
 /// from a node
-pub fn refresh_outputs<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn refresh_outputs<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	parent_key_id: &Identifier,
 	update_all: bool,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let height = wallet.w2n_client().get_chain_tip()?.0;
 	refresh_output_state(wallet, keychain_mask, height, parent_key_id, update_all)?;
@@ -402,16 +396,15 @@ where
 
 /// build a local map of wallet outputs keyed by commit
 /// and a list of outputs we want to query the node for
-pub fn map_wallet_outputs<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn map_wallet_outputs<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	parent_key_id: &Identifier,
 	update_all: bool,
 ) -> Result<HashMap<pedersen::Commitment, (Identifier, Option<u64>, Option<u32>, bool)>, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let mut wallet_outputs = HashMap::new();
 	let keychain = wallet.keychain(keychain_mask)?;
@@ -453,17 +446,16 @@ where
 }
 
 /// Cancel transaction and associated outputs
-pub fn cancel_tx_and_outputs<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn cancel_tx_and_outputs<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	mut tx: TxLogEntry,
 	outputs: Vec<OutputData>,
 	parent_key_id: &Identifier,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let mut batch = wallet.batch(keychain_mask)?;
 
@@ -490,8 +482,8 @@ where
 }
 
 /// Apply refreshed API output data to the wallet
-pub fn apply_api_outputs<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn apply_api_outputs<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	wallet_outputs: &HashMap<pedersen::Commitment, (Identifier, Option<u64>, Option<u32>, bool)>,
 	api_outputs: &HashMap<pedersen::Commitment, (String, u64, u64)>,
@@ -500,9 +492,8 @@ pub fn apply_api_outputs<'a, T: ?Sized, C, K>(
 	parent_key_id: &Identifier,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	// now for each commit, find the output in the wallet and the corresponding
 	// api output (if it exists) and refresh it in-place in the wallet.
@@ -590,6 +581,7 @@ where
 			}
 		}
 
+		let mut txs_to_save = vec![];
 		for mut tx in batch.tx_log_iter() {
 			if reverted_kernels.contains(&tx.id) && tx.parent_key_id == *parent_key_id {
 				tx.tx_type = TxLogEntryType::TxReverted;
@@ -598,9 +590,12 @@ where
 					(now - t).to_std().ok()
 				});
 				tx.confirmed = false;
-				batch.save_tx_log_entry(tx, &parent_key_id)?;
+				txs_to_save.push(tx);
 			}
 		}
+		for tx in txs_to_save {
+			batch.save_tx_log_entry(tx, &parent_key_id)?;
+		}
 
 		{
 			batch.save_last_confirmed_height(parent_key_id, height)?;
@@ -612,17 +607,16 @@ where
 
 /// Builds a single api query to retrieve the latest output data from the node.
 /// So we can refresh the local wallet outputs.
-fn refresh_output_state<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+fn refresh_output_state<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	height: u64,
 	parent_key_id: &Identifier,
 	update_all: bool,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	debug!("Refreshing wallet outputs");
 
@@ -654,16 +648,15 @@ where
 	Ok(())
 }
 
-fn find_reverted_kernels<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+fn find_reverted_kernels<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	wallet_outputs: &HashMap<pedersen::Commitment, (Identifier, Option<u64>, Option<u32>, bool)>,
 	api_outputs: &HashMap<pedersen::Commitment, (String, u64, u64)>,
 	parent_key_id: &Identifier,
 ) -> Result<HashSet<u32>, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let mut client = wallet.w2n_client().clone();
 	let mut ids = HashSet::new();
@@ -701,15 +694,14 @@ where
 	Ok(reverted)
 }
 
-fn clean_old_unconfirmed<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+fn clean_old_unconfirmed<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	height: u64,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	if height < 50 {
 		return Ok(());
@@ -734,15 +726,14 @@ where
 
 /// Retrieve summary info about the wallet
 /// caller should refresh first if desired
-pub fn retrieve_info<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn retrieve_info<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	parent_key_id: &Identifier,
 	minimum_confirmations: u64,
 ) -> Result<WalletInfo, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let current_height = wallet.last_confirmed_height()?;
 	let outputs = wallet
@@ -800,16 +791,15 @@ where
 }
 
 /// Build a coinbase output and insert into wallet
-pub fn build_coinbase<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn build_coinbase<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	block_fees: &BlockFees,
 	test_mode: bool,
 ) -> Result<CbData, Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let (out, kern, block_fees) = receive_coinbase(wallet, keychain_mask, block_fees, test_mode)?;
 
@@ -822,16 +812,15 @@ where
 
 //TODO: Split up the output creation and the wallet insertion
 /// Build a coinbase output and the corresponding kernel
-pub fn receive_coinbase<'a, T: ?Sized, C, K>(
-	wallet: &mut T,
+pub fn receive_coinbase<C, K>(
+	wallet: &mut WalletBackend<C, K>,
 	keychain_mask: Option<&SecretKey>,
 	block_fees: &BlockFees,
 	test_mode: bool,
 ) -> Result<(Output, TxKernel, BlockFees), Error>
 where
-	T: WalletBackend<'a, C, K>,
-	C: NodeClient + 'a,
-	K: Keychain + 'a,
+	C: NodeClient,
+	K: Keychain,
 {
 	let height = block_fees.height;
 	let lock_height = height + global::coinbase_maturity();
@@ -856,11 +845,11 @@ where
 			key_id: key_id.clone(),
 			n_child: key_id.to_path().last_path_index(),
 			mmr_index: None,
-			commit: commit,
+			commit,
 			value: amount,
 			status: OutputStatus::Unconfirmed,
-			height: height,
-			lock_height: lock_height,
+			height,
+			lock_height,
 			is_coinbase: true,
 			tx_log_entry: None,
 		})?;

libwallet/src/lib.rs

@@ -45,6 +45,7 @@ extern crate strum_macros;
 
 pub mod address;
 pub mod api_impl;
+mod backend;
 mod error;
 mod internal;
 pub mod mwixnet;
@@ -69,13 +70,13 @@ pub use api_impl::types::{
 	NodeHeightResult, OutputCommitMapping, PaymentProof, RetrieveTxQueryArgs,
 	RetrieveTxQuerySortField, RetrieveTxQuerySortOrder, VersionInfo,
 };
+pub use backend::{WalletBackend, WalletBatch};
 pub use internal::scan::scan;
 pub use slate_versions::ser as dalek_ser;
 pub use types::{
 	AcctPathMapping, BlockIdentifier, CbData, Context, NodeClient, NodeVersionInfo, OutputData,
 	OutputStatus, ScannedBlockInfo, StoredProofInfo, TxLogEntry, TxLogEntryType, TxWrapper,
-	ViewWallet, WalletBackend, WalletInfo, WalletInitStatus, WalletInst, WalletLCProvider,
-	WalletOutputBatch,
+	ViewWallet, WalletInfo, WalletInitStatus, WalletInst, WalletLCProvider,
 };
 
 /// Helper for taking a lock on the wallet instance

libwallet/src/types.rs

@@ -28,7 +28,7 @@ use crate::grin_util::secp::key::{PublicKey, SecretKey};
 use crate::grin_util::secp::{self, pedersen, Secp256k1};
 use crate::grin_util::{ToHex, ZeroingString};
 use crate::slate_versions::ser as dalek_ser;
-use crate::InitTxArgs;
+use crate::{InitTxArgs, WalletBackend};
 use chrono::prelude::*;
 use ed25519_dalek::PublicKey as DalekPublicKey;
 use ed25519_dalek::Signature as DalekSignature;
@@ -49,7 +49,7 @@ where
 	K: Keychain + 'a,
 {
 	/// Return the stored instance
-	fn lc_provider(&mut self) -> Result<&mut (dyn WalletLCProvider<'a, C, K> + 'a), Error>;
+	fn lc_provider(&mut self) -> Result<&mut dyn WalletLCProvider<'a, C, K>, Error>;
 }
 
 /// Trait for a provider of wallet lifecycle methods
@@ -131,182 +131,7 @@ where
 	fn delete_wallet(&self, name: Option<&str>) -> Result<(), Error>;
 
 	/// return wallet instance
-	fn wallet_inst(&mut self) -> Result<&mut Box<dyn WalletBackend<'a, C, K> + 'a>, Error>;
-}
-
-/// TODO:
-/// Wallets should implement this backend for their storage. All functions
-/// here expect that the wallet instance has instantiated itself or stored
-/// whatever credentials it needs
-pub trait WalletBackend<'ck, C, K>: Send + Sync
-where
-	C: NodeClient + 'ck,
-	K: Keychain + 'ck,
-{
-	/// Set the keychain, which should already be initialized
-	/// Optionally return a token value used to XOR the stored
-	/// key value
-	fn set_keychain(
-		&mut self,
-		k: Box<K>,
-		mask: bool,
-		use_test_rng: bool,
-	) -> Result<Option<SecretKey>, Error>;
-
-	/// Close wallet and remove any stored credentials (TBD)
-	fn close(&mut self) -> Result<(), Error>;
-
-	/// Return the keychain being used. Ensure a cloned copy so it will be dropped
-	/// and zeroized by the caller
-	/// Can optionally take a mask value
-	fn keychain(&self, mask: Option<&SecretKey>) -> Result<K, Error>;
-
-	/// Return the client being used to communicate with the node
-	fn w2n_client(&mut self) -> &mut C;
-
-	/// return the commit for caching if allowed, none otherwise
-	fn calc_commit_for_cache(
-		&mut self,
-		keychain_mask: Option<&SecretKey>,
-		amount: u64,
-		id: &Identifier,
-	) -> Result<Option<String>, Error>;
-
-	/// Set parent key id by stored account name
-	fn set_parent_key_id_by_name(&mut self, label: &str) -> Result<(), Error>;
-
-	/// The BIP32 path of the parent path to use for all output-related
-	/// functions, (essentially 'accounts' within a wallet.
-	fn set_parent_key_id(&mut self, _: Identifier);
-
-	/// return the parent path
-	fn parent_key_id(&mut self) -> Identifier;
-
-	/// Iterate over all output data stored by the backend
-	fn iter<'a>(&'a self) -> Box<dyn Iterator<Item = OutputData> + 'a>;
-
-	/// Get output data by id
-	fn get(&self, id: &Identifier, mmr_index: &Option<u64>) -> Result<OutputData, Error>;
-
-	/// Get an (Optional) tx log entry by uuid
-	fn get_tx_log_entry(&self, uuid: &Uuid) -> Result<Option<TxLogEntry>, Error>;
-
-	/// Retrieves the private context associated with a given slate id
-	fn get_private_context(
-		&mut self,
-		keychain_mask: Option<&SecretKey>,
-		slate_id: &[u8],
-	) -> Result<Context, Error>;
-
-	/// Iterate over all output data stored by the backend
-	fn tx_log_iter<'a>(&'a self) -> Box<dyn Iterator<Item = TxLogEntry> + 'a>;
-
-	/// Iterate over all stored account paths
-	fn acct_path_iter<'a>(&'a self) -> Box<dyn Iterator<Item = AcctPathMapping> + 'a>;
-
-	/// Gets an account path for a given label
-	fn get_acct_path(&self, label: String) -> Result<Option<AcctPathMapping>, Error>;
-
-	/// Stores a transaction
-	fn store_tx(&self, uuid: &str, tx: &Transaction) -> Result<(), Error>;
-
-	/// Retrieves a stored transaction from a TxLogEntry
-	fn get_stored_tx(&self, uuid: &str) -> Result<Option<Transaction>, Error>;
-
-	/// Create a new write batch to update or remove output data
-	fn batch<'a>(
-		&'a mut self,
-		keychain_mask: Option<&SecretKey>,
-	) -> Result<Box<dyn WalletOutputBatch<K> + 'a>, Error>;
-
-	/// Batch for use when keychain isn't available or required
-	fn batch_no_mask<'a>(&'a mut self) -> Result<Box<dyn WalletOutputBatch<K> + 'a>, Error>;
-
-	/// Return the current child Index
-	fn current_child_index(&mut self, parent_key_id: &Identifier) -> Result<u32, Error>;
-
-	/// Next child ID when we want to create a new output, based on current parent
-	fn next_child(&mut self, keychain_mask: Option<&SecretKey>) -> Result<Identifier, Error>;
-
-	/// last verified height of outputs directly descending from the given parent key
-	fn last_confirmed_height(&mut self) -> Result<u64, Error>;
-
-	/// last block scanned during scan or restore
-	fn last_scanned_block(&mut self) -> Result<ScannedBlockInfo, Error>;
-
-	/// Flag whether the wallet needs a full UTXO scan on next update attempt
-	fn init_status(&mut self) -> Result<WalletInitStatus, Error>;
-}
-
-/// Batch trait to update the output data backend atomically. Trying to use a
-/// batch after commit MAY result in a panic. Due to this being a trait, the
-/// commit method can't take ownership.
-/// TODO: Should these be split into separate batch objects, for outputs,
-/// tx_log entries and meta/details?
-pub trait WalletOutputBatch<K>
-where
-	K: Keychain,
-{
-	/// Return the keychain being used
-	fn keychain(&mut self) -> &mut K;
-
-	/// Add or update data about an output to the backend
-	fn save(&mut self, out: OutputData) -> Result<(), Error>;
-
-	/// Gets output data by id
-	fn get(&self, id: &Identifier, mmr_index: &Option<u64>) -> Result<OutputData, Error>;
-
-	/// Iterate over all output data stored by the backend
-	fn iter(&self) -> Box<dyn Iterator<Item = OutputData>>;
-
-	/// Delete data about an output from the backend
-	fn delete(&mut self, id: &Identifier, mmr_index: &Option<u64>) -> Result<(), Error>;
-
-	/// Save last stored child index of a given parent
-	fn save_child_index(&mut self, parent_key_id: &Identifier, child_n: u32) -> Result<(), Error>;
-
-	/// Save last confirmed height of outputs for a given parent
-	fn save_last_confirmed_height(
-		&mut self,
-		parent_key_id: &Identifier,
-		height: u64,
-	) -> Result<(), Error>;
-
-	/// Save the last PMMR index that was scanned via a scan operation
-	fn save_last_scanned_block(&mut self, block: ScannedBlockInfo) -> Result<(), Error>;
-
-	/// Save flag indicating whether wallet needs a full UTXO scan
-	fn save_init_status(&mut self, value: WalletInitStatus) -> Result<(), Error>;
-
-	/// get next tx log entry for the parent
-	fn next_tx_log_id(&mut self, parent_key_id: &Identifier) -> Result<u32, Error>;
-
-	/// Iterate over tx log data stored by the backend
-	fn tx_log_iter(&self) -> Box<dyn Iterator<Item = TxLogEntry>>;
-
-	/// save a tx log entry
-	fn save_tx_log_entry(&mut self, t: TxLogEntry, parent_id: &Identifier) -> Result<(), Error>;
-
-	/// delete a tx log entry
-	fn delete_tx_log_entry(&mut self, tx_id: u32, parent_id: &Identifier) -> Result<(), Error>;
-
-	/// save an account label -> path mapping
-	fn save_acct_path(&mut self, mapping: AcctPathMapping) -> Result<(), Error>;
-
-	/// Iterate over account names stored in backend
-	fn acct_path_iter(&self) -> Box<dyn Iterator<Item = AcctPathMapping>>;
-
-	/// Save an output as locked in the backend
-	fn lock_output(&mut self, out: &mut OutputData) -> Result<(), Error>;
-
-	/// Saves the private context associated with a slate id
-	fn save_private_context(&mut self, slate_id: &[u8], ctx: &Context) -> Result<(), Error>;
-
-	/// Delete the private context associated with the slate id
-	fn delete_private_context(&mut self, slate_id: &[u8]) -> Result<(), Error>;
-
-	/// Write the wallet data to backend file
-	fn commit(&self) -> Result<(), Error>;
+	fn wallet_inst(&mut self) -> Result<&mut WalletBackend<C, K>, Error>;
 }
 
 /// Encapsulate all wallet-node communication functions. No functions within libwallet

src/cli/cli.rs

@@ -115,7 +115,7 @@ pub fn command_loop<L, C, K>(
 	test_mode: bool,
 ) -> Result<(), Error>
 where
-	DefaultWalletImpl<'static, C>: WalletInst<'static, L, C, K>,
+	DefaultWalletImpl<C>: WalletInst<'static, L, C, K>,
 	L: WalletLCProvider<'static, C, K> + 'static,
 	C: NodeClient + 'static,
 	K: keychain::Keychain + 'static,

src/cmd/wallet_args.rs

@@ -92,7 +92,7 @@ fn prompt_recovery_phrase<L, C, K>(
 	wallet: Arc<Mutex<Box<dyn WalletInst<'static, L, C, K>>>>,
 ) -> Result<ZeroingString, ParseError>
 where
-	DefaultWalletImpl<'static, C>: WalletInst<'static, L, C, K>,
+	DefaultWalletImpl<C>: WalletInst<'static, L, C, K>,
 	L: WalletLCProvider<'static, C, K>,
 	C: NodeClient + 'static,
 	K: keychain::Keychain + 'static,
@@ -224,12 +224,12 @@ pub fn inst_wallet<L, C, K>(
 	node_client: C,
 ) -> Result<Arc<Mutex<Box<dyn WalletInst<'static, L, C, K>>>>, ParseError>
 where
-	DefaultWalletImpl<'static, C>: WalletInst<'static, L, C, K>,
+	DefaultWalletImpl<C>: WalletInst<'static, L, C, K>,
 	L: WalletLCProvider<'static, C, K>,
 	C: NodeClient + 'static,
 	K: keychain::Keychain + 'static,
 {
-	let mut wallet = Box::new(DefaultWalletImpl::<'static, C>::new(node_client.clone()).unwrap())
+	let mut wallet = Box::new(DefaultWalletImpl::<C>::new(node_client.clone()).unwrap())
 		as Box<dyn WalletInst<'static, L, C, K>>;
 	let lc = wallet.lc_provider().unwrap();
 	let _ = lc.set_top_level_directory(&config.data_file_dir);
@@ -335,7 +335,7 @@ pub fn parse_init_args<L, C, K>(
 	_test_mode: bool,
 ) -> Result<command::InitArgs, ParseError>
 where
-	DefaultWalletImpl<'static, C>: WalletInst<'static, L, C, K>,
+	DefaultWalletImpl<C>: WalletInst<'static, L, C, K>,
 	L: WalletLCProvider<'static, C, K>,
 	C: NodeClient + 'static,
 	K: keychain::Keychain + 'static,
@@ -355,16 +355,16 @@ where
 		println!("Please enter a password for your new wallet");
 	}
 
-	let password = match g_args.password.clone() {
-		Some(p) => p,
-		None => prompt_password_confirm(),
-	};
+	let password = g_args
+		.password
+		.clone()
+		.unwrap_or_else(|| prompt_password_confirm());
 
 	Ok(command::InitArgs {
-		list_length: list_length,
-		password: password,
+		list_length,
+		password,
 		config: config.clone(),
-		recovery_phrase: recovery_phrase,
+		recovery_phrase,
 		restore: false,
 	})
 }
@@ -375,9 +375,7 @@ pub fn parse_recover_args(
 where
 {
 	let passphrase = prompt_password(&g_args.password);
-	Ok(command::RecoverArgs {
-		passphrase: passphrase,
-	})
+	Ok(command::RecoverArgs { passphrase })
 }
 
 pub fn parse_listen_args(
@@ -977,7 +975,7 @@ where
 				Box<
 					dyn WalletInst<
 						'static,
-						DefaultLCProvider<'static, C, keychain::ExtKeychain>,
+						DefaultLCProvider<C, keychain::ExtKeychain>,
 						C,
 						keychain::ExtKeychain,
 					>,
@@ -1112,7 +1110,7 @@ pub fn parse_and_execute<L, C, K>(
 	cli_mode: bool,
 ) -> Result<(), Error>
 where
-	DefaultWalletImpl<'static, C>: WalletInst<'static, L, C, K>,
+	DefaultWalletImpl<C>: WalletInst<'static, L, C, K>,
 	L: WalletLCProvider<'static, C, K> + 'static,
 	C: NodeClient + 'static,
 	K: keychain::Keychain + 'static,

tests/common/mod.rs

@@ -226,7 +226,7 @@ pub fn instantiate_wallet(
 				Box<
 					dyn WalletInst<
 						'static,
-						DefaultLCProvider<'static, LocalWalletClient, ExtKeychain>,
+						DefaultLCProvider<LocalWalletClient, ExtKeychain>,
 						LocalWalletClient,
 						ExtKeychain,
 					>,
@@ -241,7 +241,7 @@ pub fn instantiate_wallet(
 	let mut wallet = Box::new(DefaultWalletImpl::<LocalWalletClient>::new(node_client).unwrap())
 		as Box<
 			dyn WalletInst<
-				DefaultLCProvider<'static, LocalWalletClient, ExtKeychain>,
+				DefaultLCProvider<LocalWalletClient, ExtKeychain>,
 				LocalWalletClient,
 				ExtKeychain,
 			>,
@@ -302,18 +302,7 @@ pub fn execute_command_no_setup<C, F>(
 where
 	C: NodeClient + 'static + Clone,
 	F: FnOnce(
-		Arc<
-			Mutex<
-				Box<
-					dyn WalletInst<
-						'static,
-						DefaultLCProvider<'static, C, ExtKeychain>,
-						C,
-						ExtKeychain,
-					>,
-				>,
-			>,
-		>,
+		Arc<Mutex<Box<dyn WalletInst<'static, DefaultLCProvider<C, ExtKeychain>, C, ExtKeychain>>>>,
 	),
 {
 	let args = app.clone().get_matches_from(arg_vec);

tests/owner_v3_lifecycle.rs

@@ -57,7 +57,7 @@ fn owner_v3_lifecycle() -> Result<(), grin_wallet_controller::Error> {
 	let wallet_proxy_a: Arc<
 		Mutex<
 			WalletProxy<
-				DefaultLCProvider<'static, LocalWalletClient, ExtKeychain>,
+				DefaultLCProvider<LocalWalletClient, ExtKeychain>,
 				LocalWalletClient,
 				ExtKeychain,
 			>,

util/Cargo.toml

@@ -21,14 +21,14 @@ thiserror = "1"
 ##### Grin Imports
 
 # For Release
-grin_util = "5.4.0"
+#grin_util = "5.4.0"
 
 # For beta release
 
 # grin_util = { git = "https://github.com/mimblewimble/grin", tag = "v5.2.0-beta.3" }
 
 # For bleeding edge
-# grin_util = { git = "https://github.com/mimblewimble/grin", branch = "master" }
+grin_util = { git = "https://github.com/mimblewimble/grin", rev = "110e0e143fdf188b69ac56c2f378c4121859703b" }
 
 # For local testing