Replace logging backend to log4rs and add log rotation (#1789)

* Replace logging backend to flexi-logger and add log rotation
* Changed flexi_logger to log4rs
* Disable logging level filtering in Root logger
* Support different logging levels for file and stdout
* Don't log messages from modules other than Grin-related
* Fix formatting
* Place backed up compressed log copies into log file directory
* Increase default log file size to 16 MiB
* Add comment to config file on log_max_size option

wallet/src/libtx/build.rs

@@ -30,7 +30,6 @@ use util::{kernel_sig_msg, secp};
 use core::core::{Input, Output, OutputFeatures, Transaction, TxKernel};
 use keychain::{self, BlindSum, BlindingFactor, Identifier, Keychain};
 use libtx::{aggsig, proof};
-use util::LOGGER;
 
 /// Context information available to transaction combinators.
 pub struct Context<'a, K: 'a>
@@ -67,8 +66,8 @@ where
 	K: Keychain,
 {
 	debug!(
-		LOGGER,
-		"Building input (spending regular output): {}, {}", value, key_id
+		"Building input (spending regular output): {}, {}",
+		value, key_id
 	);
 	build_input(value, OutputFeatures::DEFAULT_OUTPUT, key_id)
 }
@@ -78,10 +77,7 @@ pub fn coinbase_input<K>(value: u64, key_id: Identifier) -> Box<Append<K>>
 where
 	K: Keychain,
 {
-	debug!(
-		LOGGER,
-		"Building input (spending coinbase): {}, {}", value, key_id
-	);
+	debug!("Building input (spending coinbase): {}, {}", value, key_id);
 	build_input(value, OutputFeatures::COINBASE_OUTPUT, key_id)
 }
 
@@ -95,7 +91,7 @@ where
 		move |build, (tx, kern, sum)| -> (Transaction, TxKernel, BlindSum) {
 			let commit = build.keychain.commit(value, &key_id).unwrap();
 
-			debug!(LOGGER, "Building output: {}, {:?}", value, commit);
+			debug!("Building output: {}, {:?}", value, commit);
 
 			let rproof = proof::create(build.keychain, value, &key_id, commit, None).unwrap();
 

wallet/src/libtx/reward.rs

@@ -21,7 +21,7 @@ use core::core::KernelFeatures;
 use core::core::{Output, OutputFeatures, TxKernel};
 use libtx::error::Error;
 use libtx::{aggsig, proof};
-use util::{kernel_sig_msg, secp, static_secp_instance, LOGGER};
+use util::{kernel_sig_msg, secp, static_secp_instance};
 
 /// output a reward output
 pub fn output<K>(
@@ -36,7 +36,7 @@ where
 	let value = reward(fees);
 	let commit = keychain.commit(value, key_id)?;
 
-	trace!(LOGGER, "Block reward - Pedersen Commit is: {:?}", commit,);
+	trace!("Block reward - Pedersen Commit is: {:?}", commit,);
 
 	let rproof = proof::create(keychain, value, key_id, commit, None)?;
 

wallet/src/libtx/slate.rs

@@ -27,9 +27,9 @@ use keychain::{BlindSum, BlindingFactor, Keychain};
 use libtx::error::{Error, ErrorKind};
 use libtx::{aggsig, build, tx_fee};
 
+use util::secp;
 use util::secp::key::{PublicKey, SecretKey};
 use util::secp::Signature;
-use util::{secp, LOGGER};
 
 /// Public data for each participant in the slate
 
@@ -289,7 +289,7 @@ impl Slate {
 				amount_to_hr_string(fee, false),
 				amount_to_hr_string(self.amount + self.fee, false)
 			);
-			info!(LOGGER, "{}", reason);
+			info!("{}", reason);
 			return Err(ErrorKind::Fee(reason.to_string()))?;
 		}
 
@@ -395,7 +395,7 @@ impl Slate {
 		final_tx.kernels_mut()[0].excess_sig = final_sig.clone();
 
 		// confirm the kernel verifies successfully before proceeding
-		debug!(LOGGER, "Validating final transaction");
+		debug!("Validating final transaction");
 		final_tx.kernels()[0].verify()?;
 
 		// confirm the overall transaction is valid (including the updated kernel)