Integrate transaction pool with rest of the system

* Transactions coming from the network are now pushed to the pool
through the net adapter.
* New blocks accepted by the chain are sent to the pool for
eviction.
* The miner requests transactions from the pool to build its
blocks.
* The push API adds to the pool, removing the mock.
* Implementation of the adapter to the chain required by the pool
to get consistent UTXOs. Grossly unoptimized until we have the UTXO
MMR ready.

api/Cargo.toml

@@ -7,6 +7,7 @@ workspace = ".."
 [dependencies]
 grin_core = { path = "../core" }
 grin_chain = { path = "../chain" }
+grin_pool = { path = "../pool" }
 grin_util = { path = "../util" }
 secp256k1zkp = { path = "../secp256k1zkp" }
 

api/src/endpoints.rs

@@ -21,13 +21,14 @@
 //   }
 // }
 
-use std::sync::Arc;
+use std::sync::{Arc, RwLock};
 use std::thread;
 
 use core::core::{Transaction, Output};
 use core::core::hash::Hash;
 use core::ser;
 use chain::{self, Tip};
+use pool;
 use rest::*;
 use secp::pedersen::Commitment;
 use util;
@@ -85,17 +86,36 @@ impl ApiEndpoint for OutputApi {
 /// ApiEndpoint implementation for the transaction pool, to check its status
 /// and size as well as push new transactions.
 #[derive(Clone)]
-pub struct PoolApi {
+pub struct PoolApi<T> {
+	tx_pool: Arc<RwLock<pool::TransactionPool<T>>>,
 }
 
-impl ApiEndpoint for PoolApi {
+#[derive(Serialize, Deserialize)]
+struct PoolInfo {
+	pool_size: usize,
+	orphans_size: usize,
+	total_size: usize,
+}
+
+impl<T> ApiEndpoint for PoolApi<T>
+    where T: pool::BlockChain + Clone + Send + Sync + 'static
+{
 	type ID = String;
-	type T = ();
+	type T = PoolInfo;
 	type OP_IN = TxWrapper;
 	type OP_OUT = ();
 
 	fn operations(&self) -> Vec<Operation> {
-		vec![Operation::Custom("push".to_string())]
+		vec![Operation::Get, Operation::Custom("push".to_string())]
+	}
+
+	fn get(&self, id: String) -> ApiResult<PoolInfo> {
+		let pool = self.tx_pool.read().unwrap();
+		Ok(PoolInfo {
+			pool_size: pool.pool_size(),
+			orphans_size: pool.orphans_size(),
+			total_size: pool.total_size(),
+		})
 	}
 
 	fn operation(&self, op: String, input: TxWrapper) -> ApiResult<()> {
@@ -106,8 +126,15 @@ impl ApiEndpoint for PoolApi {
 				Error::Argument("Could not deserialize transaction, invalid format.".to_string())
 			})?;
 
-		println!("Fake push of transaction:");
-		println!("{:?}", tx);
+		let source = pool::TxSource {
+			debug_name: "push-api".to_string(),
+			identifier: "?.?.?.?".to_string(),
+		};
+		self.tx_pool
+			.write()
+			.unwrap()
+			.add_to_memory_pool(source, tx)
+			.map_err(|e| Error::Internal(format!("Addition to transaction pool failed: {:?}", e)))?;
 		Ok(())
 	}
 }
@@ -120,7 +147,11 @@ struct TxWrapper {
 
 /// Start all server REST APIs. Just register all of them on a ApiServer
 /// instance and runs the corresponding HTTP server.
-pub fn start_rest_apis(addr: String, chain_store: Arc<chain::ChainStore>) {
+pub fn start_rest_apis<T>(addr: String,
+                          chain_store: Arc<chain::ChainStore>,
+                          tx_pool: Arc<RwLock<pool::TransactionPool<T>>>)
+	where T: pool::BlockChain + Clone + Send + Sync + 'static
+{
 
 	thread::spawn(move || {
 		let mut apis = ApiServer::new("/v1".to_string());
@@ -128,7 +159,7 @@ pub fn start_rest_apis(addr: String, chain_store: Arc<chain::ChainStore>) {
 		                       ChainApi { chain_store: chain_store.clone() });
 		apis.register_endpoint("/chain/output".to_string(),
 		                       OutputApi { chain_store: chain_store.clone() });
-		apis.register_endpoint("/pool".to_string(), PoolApi {});
+		apis.register_endpoint("/pool".to_string(), PoolApi { tx_pool: tx_pool });
 
 		apis.start(&addr[..]).unwrap_or_else(|e| {
 			error!("Failed to start API HTTP server: {}.", e);

api/src/lib.rs

@@ -14,6 +14,7 @@
 
 extern crate grin_core as core;
 extern crate grin_chain as chain;
+extern crate grin_pool as pool;
 extern crate grin_util as util;
 extern crate secp256k1zkp as secp;
 

core/src/core/block.rs

@@ -230,7 +230,7 @@ impl Block {
 	/// transactions and the private key that will receive the reward. Checks
 	/// that all transactions are valid and calculates the Merkle tree.
 	pub fn new(prev: &BlockHeader,
-	           txs: Vec<&mut Transaction>,
+	           txs: Vec<&Transaction>,
 	           reward_key: SecretKey)
 	           -> Result<Block, secp::Error> {
 
@@ -244,7 +244,7 @@ impl Block {
 	/// a vector of transactions and the reward information. Checks
 	/// that all transactions are valid and calculates the Merkle tree.
 	pub fn with_reward(prev: &BlockHeader,
-	                   txs: Vec<&mut Transaction>,
+	                   txs: Vec<&Transaction>,
 	                   reward_out: Output,
 	                   reward_kern: TxKernel)
 	                   -> Result<Block, secp::Error> {
@@ -493,7 +493,7 @@ mod test {
 
 	// utility to create a block without worrying about the key or previous
 	// header
-	fn new_block(txs: Vec<&mut Transaction>, secp: &Secp256k1) -> Block {
+	fn new_block(txs: Vec<&Transaction>, secp: &Secp256k1) -> Block {
 		let mut rng = OsRng::new().unwrap();
 		let skey = SecretKey::new(secp, &mut rng);
 		Block::new(&BlockHeader::default(), txs, skey).unwrap()

grin/Cargo.toml

@@ -10,6 +10,7 @@ grin_chain = { path = "../chain" }
 grin_core = { path = "../core" }
 grin_store = { path = "../store" }
 grin_p2p = { path = "../p2p" }
+grin_pool = { path = "../pool" }
 grin_util = { path = "../util" }
 secp256k1zkp = { path = "../secp256k1zkp" }
 

grin/src/adapters.rs

@@ -14,14 +14,16 @@
 
 use std::net::SocketAddr;
 use std::ops::Deref;
-use std::sync::{Arc, Mutex};
+use std::sync::{Arc, Mutex, RwLock};
 use std::thread;
 
 use chain::{self, ChainAdapter};
-use core::core;
+use core::core::{self, Output};
 use core::core::hash::{Hash, Hashed};
 use core::core::target::Difficulty;
 use p2p::{self, NetAdapter, Server, PeerStore, PeerData, Capabilities, State};
+use pool;
+use secp::pedersen::Commitment;
 use util::OneTime;
 use store;
 use sync;
@@ -33,8 +35,9 @@ pub struct NetToChainAdapter {
 	/// the reference copy of the current chain state
 	chain_head: Arc<Mutex<chain::Tip>>,
 	chain_store: Arc<chain::ChainStore>,
-	chain_adapter: Arc<ChainToNetAdapter>,
+	chain_adapter: Arc<ChainToPoolAndNetAdapter>,
 	peer_store: Arc<PeerStore>,
+	tx_pool: Arc<RwLock<pool::TransactionPool<PoolToChainAdapter>>>,
 
 	syncer: OneTime<Arc<sync::Syncer>>,
 }
@@ -45,7 +48,13 @@ impl NetAdapter for NetToChainAdapter {
 	}
 
 	fn transaction_received(&self, tx: core::Transaction) {
-		unimplemented!();
+		let source = pool::TxSource {
+			debug_name: "p2p".to_string(),
+			identifier: "?.?.?.?".to_string(),
+		};
+		if let Err(e) = self.tx_pool.write().unwrap().add_to_memory_pool(source, tx) {
+			error!("Transaction rejected: {:?}", e);
+		}
 	}
 
 	fn block_received(&self, b: core::Block) {
@@ -209,7 +218,8 @@ impl NetAdapter for NetToChainAdapter {
 impl NetToChainAdapter {
 	pub fn new(chain_head: Arc<Mutex<chain::Tip>>,
 	           chain_store: Arc<chain::ChainStore>,
-	           chain_adapter: Arc<ChainToNetAdapter>,
+	           chain_adapter: Arc<ChainToPoolAndNetAdapter>,
+	           tx_pool: Arc<RwLock<pool::TransactionPool<PoolToChainAdapter>>>,
 	           peer_store: Arc<PeerStore>)
 	           -> NetToChainAdapter {
 		NetToChainAdapter {
@@ -217,6 +227,7 @@ impl NetToChainAdapter {
 			chain_store: chain_store,
 			chain_adapter: chain_adapter,
 			peer_store: peer_store,
+			tx_pool: tx_pool,
 			syncer: OneTime::new(),
 		}
 	}
@@ -231,23 +242,97 @@ impl NetToChainAdapter {
 }
 
 /// Implementation of the ChainAdapter for the network. Gets notified when the
-/// blockchain accepted a new block and forwards it to the network for
-/// broadcast.
-pub struct ChainToNetAdapter {
+/// blockchain accepted a new block, asking the pool to update its state and
+/// the network to broadcast the block
+pub struct ChainToPoolAndNetAdapter {
+	tx_pool: Arc<RwLock<pool::TransactionPool<PoolToChainAdapter>>>,
 	p2p: OneTime<Arc<Server>>,
 }
 
-impl ChainAdapter for ChainToNetAdapter {
+impl ChainAdapter for ChainToPoolAndNetAdapter {
 	fn block_accepted(&self, b: &core::Block) {
+		{
+			if let Err(e) = self.tx_pool.write().unwrap().reconcile_block(b) {
+				error!("Pool could not update itself at block {}: {:?}",
+				       b.hash(),
+				       e);
+			}
+		}
 		self.p2p.borrow().broadcast_block(b);
 	}
 }
 
-impl ChainToNetAdapter {
-	pub fn new() -> ChainToNetAdapter {
-		ChainToNetAdapter { p2p: OneTime::new() }
+impl ChainToPoolAndNetAdapter {
+	pub fn new(tx_pool: Arc<RwLock<pool::TransactionPool<PoolToChainAdapter>>>)
+	           -> ChainToPoolAndNetAdapter {
+		ChainToPoolAndNetAdapter {
+			tx_pool: tx_pool,
+			p2p: OneTime::new(),
+		}
 	}
 	pub fn init(&self, p2p: Arc<Server>) {
 		self.p2p.init(p2p);
 	}
 }
+
+/// Implements the view of the blockchain required by the TransactionPool to
+/// operate. This is mostly getting information on unspent outputs in a
+/// manner consistent with the chain state.
+#[derive(Clone)]
+pub struct PoolToChainAdapter {
+	chain_head: Arc<Mutex<chain::Tip>>,
+	chain_store: Arc<chain::ChainStore>,
+}
+
+macro_rules! none_err {
+  ($trying:expr) => {{
+    let tried = $trying;
+    if let Err(_) = tried {
+      return None;
+    }
+    tried.unwrap()
+  }}
+}
+
+impl PoolToChainAdapter {
+	/// Create a new pool adapter
+	pub fn new(chain_head: Arc<Mutex<chain::Tip>>,
+	           chain_store: Arc<chain::ChainStore>)
+	           -> PoolToChainAdapter {
+		PoolToChainAdapter {
+			chain_head: chain_head,
+			chain_store: chain_store,
+		}
+	}
+}
+
+impl pool::BlockChain for PoolToChainAdapter {
+	fn get_unspent(&self, output_ref: &Commitment) -> Option<Output> {
+		// TODO use an actual UTXO tree
+		// in the meantime doing it the *very* expensive way:
+		//   1. check the output exists
+		//   2. run the chain back from the head to check it hasn't been spent
+		if let Ok(out) = self.chain_store.get_output_by_commit(output_ref) {
+			let mut block_h: Hash;
+			{
+				let chain_head = self.chain_head.clone();
+				let head = chain_head.lock().unwrap();
+				block_h = head.last_block_h;
+			}
+			loop {
+				let b = none_err!(self.chain_store.get_block(&block_h));
+				for input in b.inputs {
+					if input.commitment() == *output_ref {
+						return None;
+					}
+				}
+				if b.header.height == 1 {
+					return Some(out);
+				} else {
+					block_h = b.header.previous;
+				}
+			}
+		}
+		None
+	}
+}

grin/src/lib.rs

@@ -40,6 +40,7 @@ extern crate grin_chain as chain;
 #[macro_use]
 extern crate grin_core as core;
 extern crate grin_p2p as p2p;
+extern crate grin_pool as pool;
 extern crate grin_store as store;
 extern crate grin_util as util;
 extern crate secp256k1zkp as secp;

grin/src/miner.rs

@@ -16,10 +16,10 @@
 //! block and mine the block to produce a valid header with its proof-of-work.
 
 use rand::{self, Rng};
-use std::sync::{Arc, Mutex};
+use std::sync::{Arc, Mutex, RwLock};
 use time;
 
-use adapters::ChainToNetAdapter;
+use adapters::{ChainToPoolAndNetAdapter, PoolToChainAdapter};
 use api;
 use core::consensus;
 use core::core;
@@ -28,15 +28,20 @@ use core::pow::cuckoo;
 use core::ser;
 use chain;
 use secp;
+use pool;
 use types::{MinerConfig, Error};
 use util;
 
+// Max number of transactions this miner will assemble in a block
+const MAX_TX: u32 = 5000;
+
 pub struct Miner {
 	config: MinerConfig,
 	chain_head: Arc<Mutex<chain::Tip>>,
 	chain_store: Arc<chain::ChainStore>,
 	/// chain adapter to net
-	chain_adapter: Arc<ChainToNetAdapter>,
+	chain_adapter: Arc<ChainToPoolAndNetAdapter>,
+	tx_pool: Arc<RwLock<pool::TransactionPool<PoolToChainAdapter>>>,
 }
 
 impl Miner {
@@ -45,13 +50,15 @@ impl Miner {
 	pub fn new(config: MinerConfig,
 	           chain_head: Arc<Mutex<chain::Tip>>,
 	           chain_store: Arc<chain::ChainStore>,
-	           chain_adapter: Arc<ChainToNetAdapter>)
+	           chain_adapter: Arc<ChainToPoolAndNetAdapter>,
+	           tx_pool: Arc<RwLock<pool::TransactionPool<PoolToChainAdapter>>>)
 	           -> Miner {
 		Miner {
 			config: config,
 			chain_head: chain_head,
 			chain_store: chain_store,
 			chain_adapter: chain_adapter,
+			tx_pool: tx_pool,
 		}
 	}
 
@@ -59,7 +66,7 @@ impl Miner {
 	/// chain anytime required and looking for PoW solution.
 	pub fn run_loop(&self) {
 		info!("Starting miner loop.");
-    let mut coinbase = self.get_coinbase();
+		let mut coinbase = self.get_coinbase();
 		loop {
 			// get the latest chain state and build a block on top of it
 			let head: core::BlockHeader;
@@ -77,7 +84,7 @@ impl Miner {
 			debug!("Mining at Cuckoo{} for at most 2 secs on block {} at difficulty {}.",
 			       b.header.cuckoo_len,
 			       latest_hash,
-             b.header.difficulty);
+			       b.header.difficulty);
 			let mut iter_count = 0;
 			while head.hash() == latest_hash && time::get_time().sec < deadline {
 				let pow_hash = b.hash();
@@ -110,7 +117,7 @@ impl Miner {
 				} else if let Ok(Some(tip)) = res {
 					let chain_head = self.chain_head.clone();
 					let mut head = chain_head.lock().unwrap();
-          coinbase = self.get_coinbase();
+					coinbase = self.get_coinbase();
 					*head = tip;
 				}
 			} else {
@@ -122,7 +129,10 @@ impl Miner {
 
 	/// Builds a new block with the chain head as previous and eligible
 	/// transactions from the pool.
-	fn build_block(&self, head: &core::BlockHeader, coinbase: (core::Output, core::TxKernel)) -> core::Block {
+	fn build_block(&self,
+	               head: &core::BlockHeader,
+	               coinbase: (core::Output, core::TxKernel))
+	               -> core::Block {
 		let mut now_sec = time::get_time().sec;
 		let head_sec = head.timestamp.to_timespec().sec;
 		if now_sec == head_sec {
@@ -131,9 +141,10 @@ impl Miner {
 		let (difficulty, cuckoo_len) =
 			consensus::next_target(now_sec, head_sec, head.difficulty.clone(), head.cuckoo_len);
 
-		// TODO populate inputs and outputs from pool transactions
-    let (output, kernel) = coinbase;
-		let mut b = core::Block::with_reward(head, vec![], output, kernel).unwrap();
+		let txs_box = self.tx_pool.read().unwrap().prepare_mineable_transactions(MAX_TX);
+		let txs = txs_box.iter().map(|tx| tx.as_ref()).collect();
+		let (output, kernel) = coinbase;
+		let mut b = core::Block::with_reward(head, txs, output, kernel).unwrap();
 
 		let mut rng = rand::OsRng::new().unwrap();
 		b.header.nonce = rng.gen();
@@ -145,21 +156,23 @@ impl Miner {
 
 	fn get_coinbase(&self) -> (core::Output, core::TxKernel) {
 		if self.config.burn_reward {
-		  let mut rng = rand::OsRng::new().unwrap();
+			let mut rng = rand::OsRng::new().unwrap();
 			let secp_inst = secp::Secp256k1::with_caps(secp::ContextFlag::Commit);
 			let skey = secp::key::SecretKey::new(&secp_inst, &mut rng);
-      core::Block::reward_output(skey, &secp_inst).unwrap()
-    } else {
-      let url = format!("{}/v1/receive_coinbase", self.config.wallet_receiver_url.as_str());
-      let res: CbData = api::client::post(url.as_str(), &CbAmount { amount: consensus::REWARD })
+			core::Block::reward_output(skey, &secp_inst).unwrap()
+		} else {
+			let url = format!("{}/v1/receive_coinbase",
+			                  self.config.wallet_receiver_url.as_str());
+			let res: CbData = api::client::post(url.as_str(),
+			                                    &CbAmount { amount: consensus::REWARD })
 				.expect("Wallet receiver unreachable, could not claim reward. Is it running?");
-      let out_bin = util::from_hex(res.output).unwrap();
-      let kern_bin = util::from_hex(res.kernel).unwrap();
-      let output = ser::deserialize(&mut &out_bin[..]).unwrap();
-      let kernel = ser::deserialize(&mut &kern_bin[..]).unwrap();
+			let out_bin = util::from_hex(res.output).unwrap();
+			let kern_bin = util::from_hex(res.kernel).unwrap();
+			let output = ser::deserialize(&mut &out_bin[..]).unwrap();
+			let kernel = ser::deserialize(&mut &kern_bin[..]).unwrap();
 
-      (output, kernel)
-    }
+			(output, kernel)
+		}
 	}
 }
 

grin/src/server.rs

@@ -17,7 +17,7 @@
 //! as a facade.
 
 use std::net::SocketAddr;
-use std::sync::{Arc, Mutex};
+use std::sync::{Arc, Mutex, RwLock};
 use std::thread;
 use std::time;
 
@@ -25,7 +25,7 @@ use futures::{future, Future, Stream};
 use tokio_core::reactor;
 use tokio_timer::Timer;
 
-use adapters::{NetToChainAdapter, ChainToNetAdapter};
+use adapters::*;
 use api;
 use chain;
 use chain::ChainStore;
@@ -33,6 +33,7 @@ use core;
 use core::core::hash::Hashed;
 use miner;
 use p2p;
+use pool;
 use seed;
 use store;
 use sync;
@@ -50,7 +51,9 @@ pub struct Server {
 	chain_store: Arc<chain::ChainStore>,
 	/// chain adapter to net, required for miner and anything that submits
 	/// blocks
-	chain_adapter: Arc<ChainToNetAdapter>,
+	chain_adapter: Arc<ChainToPoolAndNetAdapter>,
+	/// in-memory transaction pool
+	tx_pool: Arc<RwLock<pool::TransactionPool<PoolToChainAdapter>>>,
 }
 
 impl Server {
@@ -82,10 +85,15 @@ impl Server {
 
 		let peer_store = Arc::new(p2p::PeerStore::new(config.db_root.clone())?);
 
-		let chain_adapter = Arc::new(ChainToNetAdapter::new());
+		let pool_adapter = Arc::new(PoolToChainAdapter::new(shared_head.clone(),
+		                                                    chain_store.clone()));
+		let tx_pool = Arc::new(RwLock::new(pool::TransactionPool::new(pool_adapter)));
+
+		let chain_adapter = Arc::new(ChainToPoolAndNetAdapter::new(tx_pool.clone()));
 		let net_adapter = Arc::new(NetToChainAdapter::new(shared_head.clone(),
 		                                                  chain_store.clone(),
 		                                                  chain_adapter.clone(),
+		                                                  tx_pool.clone(),
 		                                                  peer_store.clone()));
 		let server =
 			Arc::new(p2p::Server::new(config.capabilities, config.p2p_config, net_adapter.clone()));
@@ -107,7 +115,9 @@ impl Server {
 
 		evt_handle.spawn(server.start(evt_handle.clone()).map_err(|_| ()));
 
-		api::start_rest_apis(config.api_http_addr.clone(), chain_store.clone());
+		api::start_rest_apis(config.api_http_addr.clone(),
+		                     chain_store.clone(),
+		                     tx_pool.clone());
 
 		warn!("Grin server started.");
 		Ok(Server {
@@ -117,6 +127,7 @@ impl Server {
 			chain_head: shared_head,
 			chain_store: chain_store,
 			chain_adapter: chain_adapter,
+			tx_pool: tx_pool,
 		})
 	}
 
@@ -137,7 +148,8 @@ impl Server {
 		let miner = miner::Miner::new(config,
 		                              self.chain_head.clone(),
 		                              self.chain_store.clone(),
-		                              self.chain_adapter.clone());
+		                              self.chain_adapter.clone(),
+		                              self.tx_pool.clone());
 		thread::spawn(move || {
 			miner.run_loop();
 		});

pool/src/lib.rs

@@ -35,4 +35,4 @@ extern crate grin_core as core;
 extern crate secp256k1zkp as secp;
 
 pub use pool::TransactionPool;
-pub use types::{BlockChain, PoolError};
+pub use types::{BlockChain, TxSource, PoolError};

pool/src/pool.rs

@@ -43,7 +43,7 @@ pub struct TransactionPool<T> {
 }
 
 impl<T> TransactionPool<T> where T: BlockChain {
-    fn new(chain: Arc<T>) -> TransactionPool<T> {
+    pub fn new(chain: Arc<T>) -> TransactionPool<T> {
         TransactionPool{
             transactions: HashMap::new(),
             pool: Pool::empty(),
@@ -380,8 +380,6 @@ impl<T> TransactionPool<T> where T: BlockChain {
 
             conflicting_txs.append(&mut conflicting_outputs);
 
-            println!("Conflicting txs: {:?}", conflicting_txs);
-
             for txh in conflicting_txs {
                 self.mark_transaction(txh, &mut marked_transactions);
             }
@@ -436,7 +434,6 @@ impl<T> TransactionPool<T> where T: BlockChain {
         marked_transactions: HashMap<hash::Hash, ()>,)
         ->Vec<Box<transaction::Transaction>> {
 
-        println!("marked_txs: {:?}", marked_transactions);
         let mut removed_txs = Vec::new();
 
         for tx_hash in marked_transactions.keys() {
@@ -876,8 +873,6 @@ mod tests {
         }
         tx_elements.push(build::with_fee(fees as u64));
 
-        println!("Fee was {}", fees as u64);
-
         let (tx, _) = build::transaction(tx_elements).unwrap();
         tx
     }

store/src/lib.rs

@@ -116,9 +116,9 @@ impl Store {
 	/// extract only partial data. The underlying Readable size must align
 	/// accordingly. Encapsulates serialization.
 	pub fn get_ser_limited<T: ser::Readable>(&self,
-	                                            key: &[u8],
-	                                            len: usize)
-	                                            -> Result<Option<T>, Error> {
+	                                         key: &[u8],
+	                                         len: usize)
+	                                         -> Result<Option<T>, Error> {
 		let data = try!(self.get(key));
 		match data {
 			Some(val) => {
@@ -187,6 +187,11 @@ impl<'a> Batch<'a> {
 		}
 	}
 
+	pub fn delete(mut self, key: &[u8]) -> Result<Batch<'a>, Error> {
+		self.batch.delete(key)?;
+		Ok(self)
+	}
+
 	/// Writes the batch to RocksDb.
 	pub fn write(self) -> Result<(), Error> {
 		self.store.write(self.batch)

wallet/src/checker.rs

@@ -17,7 +17,6 @@
 
 use api;
 use core::core::{Output, DEFAULT_OUTPUT, COINBASE_OUTPUT};
-use core::core::hash::Hashed;
 use secp::{self, pedersen};
 use util;