Basic Dandelion transaction routing (#719)

* Initial Dandelion Commit
* Changed stem_tx_pool to tx_stempool
* Introduction of stem memory pool and stem pool config
* Pool push now send to stem memory pool
* Add stem transaction functions
* Add stem transaction pool
* Drastically simplified code structure
* Add monitor transactions
* Add Dandelion monitor and remove transactions from stempool
* Add peer relay monitor
* Reconcile block with stempool
* Fix total size bug
* Add fluff option for pool push
* Added details on dandelion monitor
* Fix issue with missing parent
* Child transaction with stempool parent are now forced stem
* Update Dandelion Relay from outgoing peers
* Fix missing pool reconciliation
* Add the ability to fluff a transaction directly
* Fix tests for Dandelion
* Missing send_stem_transaction method...
* Add fluff handler for wallet
* Add logger when successfully updated Dandelion relay
* Launch transaction monitor last
* Fix dandelion relay misplaced
* Add logging and updating for stempool
* Additionnal check for stem transaction
* Fix 2 Locks in a row

api/src/handlers.rs

@@ -516,9 +516,10 @@ struct TxWrapper {
 	tx_hex: String,
 }
 
-// Push new transactions to our transaction pool, that should broadcast it
+// Push new transactions to our stem transaction pool, that should broadcast it
 // to the network if valid.
 struct PoolPushHandler<T> {
+	peers: Weak<p2p::Peers>,
 	tx_pool: Weak<RwLock<pool::TransactionPool<T>>>,
 }
 
@@ -548,8 +549,28 @@ where
 			tx.outputs.len()
 		);
 
+		let mut fluff = false;
+		if let Ok(params) = req.get_ref::<UrlEncodedQuery>() {
+			if let Some(_) = params.get("fluff") {
+				fluff = true;
+			}
+		}
+
+		// Will not do a stem transaction if our dandelion peer relay is empty
+		if !fluff && w(&self.peers).get_dandelion_relay().is_empty() {
+			debug!(
+				LOGGER,
+				"Missing Dandelion relay: will push stem transaction normally"
+			);
+			fluff = true;
+		}
+
+		//  Push into the pool or stempool
 		let pool_arc = w(&self.tx_pool);
-		let res = pool_arc.write().unwrap().add_to_memory_pool(source, tx);
+		let res = pool_arc
+			.write()
+			.unwrap()
+			.add_to_memory_pool(source, tx, !fluff);
 
 		match res {
 			Ok(()) => Ok(Response::with(status::Ok)),
@@ -626,6 +647,7 @@ pub fn start_rest_apis<T>(
 				tx_pool: tx_pool.clone(),
 			};
 			let pool_push_handler = PoolPushHandler {
+				peers: peers.clone(),
 				tx_pool: tx_pool.clone(),
 			};
 			let peers_all_handler = PeersAllHandler {