Provide wallet 'plugin' architecture (#1983)

* remove receive_coinbase fn from wallet to wallet client

* start moving clients into separate mod

* rustfmt

* move wallet client + start listener into wallet 'clients'

* rustfmt

* refactor API to make it more modular and completely decouple sending

* rustfmt

* further decouple API from sending methods

* rustfmt

* remove wallet to wallet client trait

* rustfmt

* rename / refactor client + adapters

* rustfmt

* add adapter concept

* add midding node_clients dir

* add file and null adapters

* rustfmt

* remove receive from owner api

* factor out receiving slates into trait

* rustfmt

* adding listen trait

* rustfmt

* change listener to use trait

* rustfmt

* add test for file-based exchange

* replace http api send command

* rustfmt

* move controller out of libwallet and into top-level wallet dir

* rustfmt

* add moved controller

.gitignore

@@ -2,6 +2,7 @@
 .DS_Store
 .grin*
 node*
+!node_clients
 target
 Cargo.lock
 *.iml

api/src/rest.rs

@@ -92,8 +92,8 @@ impl From<Context<ErrorKind>> for Error {
 
 /// TLS config
 pub struct TLSConfig {
-	certificate: String,
+	pub certificate: String,
-	private_key: String,
+	pub private_key: String,
 }
 
 impl TLSConfig {

doc/wallet/design/design.md

@@ -24,7 +24,7 @@ the code is organized into the following components (from highest-level to lowes
 * **libTx** - Library that provides lower-level transaction building, rangeproof and signing functions, highly-reusable by wallet implementors.
 * **Wallet Traits** - A set of generic traits defined within libWallet and the `keychain` crate . A wallet implementation such as Grin's current
   default only needs to implement these traits in order to provide a wallet:
-  * **WalletToNodeClient** - Defines communication between the wallet, a running grin node and/or other wallets
+  * **NodeClient** - Defines communication between the wallet, a running grin node and/or other wallets
   * **WalletBackend** - Defines the storage implementation of the wallet
   * **KeyChain** - Defines key derivation operations
   
@@ -66,22 +66,22 @@ pub fn retrieve_outputs<T: ?Sized, C, K>(
 ) -> Result<Vec<OutputData>, Error>
 where
 !·T: WalletBackend<C, K>,
-!·C: WalletToNodeClient,
+!·C: NodeClient,
 !·K: Keychain,
 {  
 ```
 
 With `T` in this instance being a class that implements  the `WalletBackend` trait, which is further parameterized with implementations of
-`WalletToNodeClient` and `Keychain`.
+`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
 [BIP-38 style](https://github.com/bitcoin/bips/blob/master/bip-0038.mediawiki) 'master key -> child key' model.
 
-There are two implementations of `WalletToNodeClient` within the code, the main version being the `HTTPWalletToNodeClient` found within `wallet/src/client.rs` and
+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 WalletToNodeClient isolates all network calls, so upgrading wallet
+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 `WalletToNodeClient` implementations.
+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

doc/wallet/design/wallet-arch.puml

@@ -40,7 +40,7 @@ folder "Provided by Grin" as services {
 package "Traits Implemented by Wallets" as traits {
 	database "WalletBackend" as wallet_backend
 	database "KeyChain" as keychain
-	component "WalletToNodeClient" as wallet_client
+	component "NodeClient" as wallet_client
 }
 
 note left of wallet_client

servers/tests/framework/mod.rs

@@ -30,7 +30,7 @@ use std::{fs, thread, time};
 use util::Mutex;
 
 use framework::keychain::Keychain;
-use wallet::{HTTPWalletToNodeClient, HTTPWalletToWalletClient, LMDBBackend, WalletConfig};
+use wallet::{HTTPNodeClient, HTTPWalletCommAdapter, LMDBBackend, WalletCommAdapter, WalletConfig};
 
 /// Just removes all results from previous runs
 pub fn clean_all_output(test_name_dir: &str) {
@@ -265,27 +265,19 @@ impl LocalServerContainer {
 		let _ = fs::create_dir_all(self.wallet_config.clone().data_file_dir);
 		let r = wallet::WalletSeed::init_file(&self.wallet_config);
 
-		let client_n =
+		let client_n = HTTPNodeClient::new(&self.wallet_config.check_node_api_http_addr, None);
-			HTTPWalletToNodeClient::new(&self.wallet_config.check_node_api_http_addr, None);
-		let client_w = HTTPWalletToWalletClient::new();
 
 		if let Err(_e) = r {
 			//panic!("Error initializing wallet seed: {}", e);
 		}
 
-		let wallet: LMDBBackend<
+		let wallet: LMDBBackend<HTTPNodeClient, keychain::ExtKeychain> =
-			HTTPWalletToNodeClient,
+			LMDBBackend::new(self.wallet_config.clone(), "", client_n).unwrap_or_else(|e| {
-			HTTPWalletToWalletClient,
-			keychain::ExtKeychain,
-		> =
-			LMDBBackend::new(self.wallet_config.clone(), "", client_n, client_w).unwrap_or_else(
-				|e| {
 				panic!(
 					"Error creating wallet: {:?} Config: {:?}",
 					e, self.wallet_config
 				)
-				},
+			});
-			);
 
 		wallet::controller::foreign_listener(
 			Arc::new(Mutex::new(wallet)),
@@ -316,9 +308,8 @@ impl LocalServerContainer {
 		let keychain: keychain::ExtKeychain = wallet_seed
 			.derive_keychain("")
 			.expect("Failed to derive keychain from seed file and passphrase.");
-		let client_n = HTTPWalletToNodeClient::new(&config.check_node_api_http_addr, None);
+		let client_n = HTTPNodeClient::new(&config.check_node_api_http_addr, None);
-		let client_w = HTTPWalletToWalletClient::new();
+		let mut wallet = LMDBBackend::new(config.clone(), "", client_n)
-		let mut wallet = LMDBBackend::new(config.clone(), "", client_n, client_w)
 			.unwrap_or_else(|e| panic!("Error creating wallet: {:?} Config: {:?}", e, config));
 		wallet.keychain = Some(keychain);
 		let parent_id = keychain::ExtKeychain::derive_key_id(2, 0, 0, 0, 0);
@@ -344,35 +335,33 @@ impl LocalServerContainer {
 			.derive_keychain("")
 			.expect("Failed to derive keychain from seed file and passphrase.");
 
-		let client_n = HTTPWalletToNodeClient::new(&config.check_node_api_http_addr, None);
+		let client_n = HTTPNodeClient::new(&config.check_node_api_http_addr, None);
-		let client_w = HTTPWalletToWalletClient::new();
+		let client_w = HTTPWalletCommAdapter::new();
 
 		let max_outputs = 500;
 		let change_outputs = 1;
 
-		let mut wallet = LMDBBackend::new(config.clone(), "", client_n, client_w)
+		let mut wallet = LMDBBackend::new(config.clone(), "", client_n)
 			.unwrap_or_else(|e| panic!("Error creating wallet: {:?} Config: {:?}", e, config));
 		wallet.keychain = Some(keychain);
 		let _ = wallet::controller::owner_single_use(Arc::new(Mutex::new(wallet)), |api| {
-			let result = api.issue_send_tx(
+			let (mut slate, lock_fn) = api.initiate_tx(
+				None,
 				amount,
 				minimum_confirmations,
-				dest,
 				max_outputs,
 				change_outputs,
 				selection_strategy == "all",
-			);
+			)?;
-			match result {
+			slate = client_w.send_tx_sync(dest, &slate)?;
-				Ok(_) => println!(
+			api.finalize_tx(&mut slate)?;
+			api.tx_lock_outputs(&slate, lock_fn)?;
+			println!(
 				"Tx sent: {} grin to {} (strategy '{}')",
 				core::core::amount_to_hr_string(amount, false),
 				dest,
 				selection_strategy,
-				),
+			);
-				Err(e) => {
-					println!("Tx not sent to {}: {:?}", dest, e);
-				}
-			};
 			Ok(())
 		}).unwrap_or_else(|e| panic!("Error creating wallet: {:?} Config: {:?}", e, config));
 	}

servers/tests/simulnet.rs

@@ -37,11 +37,10 @@ use core::core::hash::Hashed;
 use core::global::{self, ChainTypes};
 
 use wallet::controller;
-use wallet::libtx::slate::Slate;
 use wallet::libwallet::types::{WalletBackend, WalletInst};
 use wallet::lmdb_wallet::LMDBBackend;
 use wallet::WalletConfig;
-use wallet::{HTTPWalletToNodeClient, HTTPWalletToWalletClient};
+use wallet::{HTTPNodeClient, HTTPWalletCommAdapter, WalletCommAdapter};
 
 use framework::{
 	config, stop_all_servers, LocalServerContainerConfig, LocalServerContainerPool,
@@ -880,19 +879,15 @@ fn long_fork_test_case_6(s: &Vec<servers::Server>) {
 
 pub fn create_wallet(
 	dir: &str,
-	client_n: HTTPWalletToNodeClient,
+	client_n: HTTPNodeClient,
-	client_w: HTTPWalletToWalletClient,
+) -> Arc<Mutex<WalletInst<HTTPNodeClient, keychain::ExtKeychain>>> {
-) -> Arc<Mutex<WalletInst<HTTPWalletToNodeClient, HTTPWalletToWalletClient, keychain::ExtKeychain>>>
-{
 	let mut wallet_config = WalletConfig::default();
 	wallet_config.data_file_dir = String::from(dir);
 	let _ = wallet::WalletSeed::init_file(&wallet_config);
-	let mut wallet: LMDBBackend<
+	let mut wallet: LMDBBackend<HTTPNodeClient, keychain::ExtKeychain> =
-		HTTPWalletToNodeClient,
+		LMDBBackend::new(wallet_config.clone(), "", client_n).unwrap_or_else(|e| {
-		HTTPWalletToWalletClient,
+			panic!("Error creating wallet: {:?} Config: {:?}", e, wallet_config)
-		keychain::ExtKeychain,
+		});
-	> = LMDBBackend::new(wallet_config.clone(), "", client_n, client_w)
-		.unwrap_or_else(|e| panic!("Error creating wallet: {:?} Config: {:?}", e, wallet_config));
 	wallet.open_with_credentials().unwrap_or_else(|e| {
 		panic!(
 			"Error initializing wallet: {:?} Config: {:?}",
@@ -912,26 +907,17 @@ fn replicate_tx_fluff_failure() {
 
 	// Create Wallet 1 (Mining Input) and start it listening
 	// Wallet 1 post to another node, just for fun
-	let client1 = HTTPWalletToNodeClient::new("http://127.0.0.1:23003", None);
+	let client1 = HTTPNodeClient::new("http://127.0.0.1:23003", None);
-	let client1_w = HTTPWalletToWalletClient::new();
+	let client1_w = HTTPWalletCommAdapter::new();
-	let wallet1 = create_wallet(
+	let wallet1 = create_wallet("target/tmp/tx_fluff/wallet1", client1.clone());
-		"target/tmp/tx_fluff/wallet1",
-		client1.clone(),
-		client1_w.clone(),
-	);
 	let wallet1_handle = thread::spawn(move || {
 		controller::foreign_listener(wallet1, "127.0.0.1:33000", None)
 			.unwrap_or_else(|e| panic!("Error creating wallet1 listener: {:?}", e,));
 	});
 
 	// Create Wallet 2 (Recipient) and launch
-	let client2 = HTTPWalletToNodeClient::new("http://127.0.0.1:23001", None);
+	let client2 = HTTPNodeClient::new("http://127.0.0.1:23001", None);
-	let client2_w = HTTPWalletToWalletClient::new();
+	let wallet2 = create_wallet("target/tmp/tx_fluff/wallet2", client2.clone());
-	let wallet2 = create_wallet(
-		"target/tmp/tx_fluff/wallet2",
-		client2.clone(),
-		client2_w.clone(),
-	);
 	let wallet2_handle = thread::spawn(move || {
 		controller::foreign_listener(wallet2, "127.0.0.1:33001", None)
 			.unwrap_or_else(|e| panic!("Error creating wallet2 listener: {:?}", e,));
@@ -971,26 +957,23 @@ fn replicate_tx_fluff_failure() {
 	thread::sleep(time::Duration::from_secs(10));
 
 	// get another instance of wallet1 (to update contents and perform a send)
-	let wallet1 = create_wallet(
+	let wallet1 = create_wallet("target/tmp/tx_fluff/wallet1", client1.clone());
-		"target/tmp/tx_fluff/wallet1",
-		client1.clone(),
-		client1_w.clone(),
-	);
 
 	let amount = 30_000_000_000;
-	let mut slate = Slate::blank(1);
+	let dest = "http://127.0.0.1:33001";
 
 	wallet::controller::owner_single_use(wallet1, |api| {
-		slate = api
+		let (mut slate, lock_fn) = api.initiate_tx(
-			.issue_send_tx(
+			None, amount, // amount
-				amount,                   // amount
 			2,      // minimum confirmations
-				"http://127.0.0.1:33001", // dest
 			500,    // max outputs
 			1000,   // num change outputs
 			true,   // select all outputs
-			).unwrap();
+		)?;
-		api.post_tx(&slate, false).unwrap();
+		slate = client1_w.send_tx_sync(dest, &slate)?;
+		api.finalize_tx(&mut slate)?;
+		api.tx_lock_outputs(&slate, lock_fn)?;
+		api.post_tx(&slate, false)?;
 		Ok(())
 	}).unwrap();
 
@@ -998,11 +981,7 @@ fn replicate_tx_fluff_failure() {
 	thread::sleep(time::Duration::from_secs(200));
 
 	// get another instance of wallet (to check contents)
-	let wallet2 = create_wallet(
+	let wallet2 = create_wallet("target/tmp/tx_fluff/wallet2", client2.clone());
-		"target/tmp/tx_fluff/wallet2",
-		client2.clone(),
-		client2_w.clone(),
-	);
 
 	wallet::controller::owner_single_use(wallet2, |api| {
 		let res = api.retrieve_summary_info(true).unwrap();

src/bin/cmd/wallet.rs

@@ -13,15 +13,11 @@
 // limitations under the License.
 
 use clap::ArgMatches;
-use serde_json as json;
+use std::collections::HashMap;
-use std::fs::File;
-use std::io::Read;
 use std::path::{Path, PathBuf};
 /// Wallet commands processing
-use std::sync::Arc;
 use std::thread;
 use std::time::Duration;
-use util::Mutex;
 
 use api::TLSConfig;
 use config::GlobalWalletConfig;
@@ -29,8 +25,8 @@ use core::{core, global};
 use grin_wallet::libwallet::ErrorKind;
 use grin_wallet::{self, controller, display, libwallet};
 use grin_wallet::{
-	HTTPWalletToNodeClient, HTTPWalletToWalletClient, LMDBBackend, WalletBackend, WalletConfig,
+	instantiate_wallet, FileWalletCommAdapter, HTTPNodeClient, HTTPWalletCommAdapter, LMDBBackend,
-	WalletInst, WalletSeed,
+	NullWalletCommAdapter, WalletConfig, WalletSeed,
 };
 use keychain;
 use servers::start_webwallet_server;
@@ -52,31 +48,6 @@ pub fn seed_exists(wallet_config: WalletConfig) -> bool {
 		false
 	}
 }
-pub fn instantiate_wallet(
-	wallet_config: WalletConfig,
-	passphrase: &str,
-	account: &str,
-	node_api_secret: Option<String>,
-) -> Arc<Mutex<WalletInst<HTTPWalletToNodeClient, HTTPWalletToWalletClient, keychain::ExtKeychain>>>
-{
-	let client_n =
-		HTTPWalletToNodeClient::new(&wallet_config.check_node_api_http_addr, node_api_secret);
-	let client_w = HTTPWalletToWalletClient::new();
-	let mut db_wallet = LMDBBackend::new(wallet_config.clone(), passphrase, client_n, client_w)
-		.unwrap_or_else(|e| {
-			panic!(
-				"Error creating DB wallet: {} Config: {:?}",
-				e, wallet_config
-			);
-		});
-	db_wallet
-		.set_parent_key_id_by_name(account)
-		.unwrap_or_else(|e| {
-			panic!("Error starting wallet: {}", e);
-		});
-	info!("Using LMDB Backend for wallet");
-	Arc::new(Mutex::new(db_wallet))
-}
 
 pub fn wallet_command(wallet_args: &ArgMatches, config: GlobalWalletConfig) -> i32 {
 	// just get defaults from the global config
@@ -110,13 +81,9 @@ pub fn wallet_command(wallet_args: &ArgMatches, config: GlobalWalletConfig) -> i
 		WalletSeed::init_file(&wallet_config).expect("Failed to init wallet seed file.");
 		info!("Wallet seed file created");
 		let client_n =
-			HTTPWalletToNodeClient::new(&wallet_config.check_node_api_http_addr, node_api_secret);
+			HTTPNodeClient::new(&wallet_config.check_node_api_http_addr, node_api_secret);
-		let client_w = HTTPWalletToWalletClient::new();
+		let _: LMDBBackend<HTTPNodeClient, keychain::ExtKeychain> =
-		let _: LMDBBackend<
+			LMDBBackend::new(wallet_config.clone(), "", client_n).unwrap_or_else(|e| {
-			HTTPWalletToNodeClient,
-			HTTPWalletToWalletClient,
-			keychain::ExtKeychain,
-		> = LMDBBackend::new(wallet_config.clone(), "", client_n, client_w).unwrap_or_else(|e| {
 				panic!(
 					"Error creating DB for wallet: {} Config: {:?}",
 					e, wallet_config
@@ -145,13 +112,6 @@ pub fn wallet_command(wallet_args: &ArgMatches, config: GlobalWalletConfig) -> i
 		Some(p) => p,
 	};
 
-	let wallet = instantiate_wallet(
-		wallet_config.clone(),
-		passphrase,
-		account,
-		node_api_secret.clone(),
-	);
-
 	// Handle listener startup commands
 	{
 		let api_secret = get_first_line(wallet_config.api_secret_path.clone());
@@ -173,10 +133,23 @@ pub fn wallet_command(wallet_args: &ArgMatches, config: GlobalWalletConfig) -> i
 				if let Some(port) = listen_args.value_of("port") {
 					wallet_config.api_listen_port = port.parse().unwrap();
 				}
-				controller::foreign_listener(
+				let mut params = HashMap::new();
-					wallet.clone(),
+				params.insert(
-					&wallet_config.api_listen_addr(),
+					"api_listen_addr".to_owned(),
-					tls_conf,
+					wallet_config.api_listen_addr(),
+				);
+				if let Some(t) = tls_conf {
+					params.insert("certificate".to_owned(), t.certificate);
+					params.insert("private_key".to_owned(), t.private_key);
+				}
+				let adapter = HTTPWalletCommAdapter::new();
+				adapter
+					.listen(
+						params,
+						wallet_config.clone(),
+						passphrase,
+						account,
+						node_api_secret.clone(),
 					).unwrap_or_else(|e| {
 						panic!(
 							"Error creating wallet listener: {:?} Config: {:?}",
@@ -185,6 +158,12 @@ pub fn wallet_command(wallet_args: &ArgMatches, config: GlobalWalletConfig) -> i
 					});
 			}
 			("owner_api", Some(_api_args)) => {
+				let wallet = instantiate_wallet(
+					wallet_config.clone(),
+					passphrase,
+					account,
+					node_api_secret.clone(),
+				);
 				// TLS is disabled because we bind to localhost
 				controller::owner_listener(wallet.clone(), "127.0.0.1:13420", api_secret, None)
 					.unwrap_or_else(|e| {
@@ -195,6 +174,12 @@ pub fn wallet_command(wallet_args: &ArgMatches, config: GlobalWalletConfig) -> i
 					});
 			}
 			("web", Some(_api_args)) => {
+				let wallet = instantiate_wallet(
+					wallet_config.clone(),
+					passphrase,
+					account,
+					node_api_secret.clone(),
+				);
 				// start owner listener and run static file server
 				start_webwallet_server();
 				controller::owner_listener(wallet.clone(), "127.0.0.1:13420", api_secret, tls_conf)
@@ -209,6 +194,13 @@ pub fn wallet_command(wallet_args: &ArgMatches, config: GlobalWalletConfig) -> i
 		};
 	}
 
+	let wallet = instantiate_wallet(
+		wallet_config.clone(),
+		passphrase,
+		account,
+		node_api_secret.clone(),
+	);
+
 	let res = controller::owner_single_use(wallet.clone(), |api| {
 		match wallet_args.subcommand() {
 			("account", Some(acct_args)) => {
@@ -299,17 +291,22 @@ pub fn wallet_command(wallet_args: &ArgMatches, config: GlobalWalletConfig) -> i
 					})?;
 				let fluff = send_args.is_present("fluff");
 				let max_outputs = 500;
-				if method == "http" {
+				if method == "http" && !dest.starts_with("http://") && !dest.starts_with("https://")
-					if dest.starts_with("http://") || dest.starts_with("https://") {
+				{
-						let result = api.issue_send_tx(
+					return Err(ErrorKind::GenericError(format!(
+						"HTTP Destination should start with http://: or https://: {}",
+						dest
+					)).into());
+				}
+				let result = api.initiate_tx(
+					None,
 					amount,
 					minimum_confirmations,
-							dest,
 					max_outputs,
 					change_outputs,
 					selection_strategy == "all",
 				);
-						let slate = match result {
+				let (mut slate, lock_fn) = match result {
 					Ok(s) => {
 						info!(
 							"Tx created: {} grin to {} (strategy '{}')",
@@ -334,88 +331,40 @@ pub fn wallet_command(wallet_args: &ArgMatches, config: GlobalWalletConfig) -> i
 						return Err(e);
 					}
 				};
+				let adapter = match method {
+					"http" => HTTPWalletCommAdapter::new(),
+					"file" => FileWalletCommAdapter::new(),
+					"self" => NullWalletCommAdapter::new(),
+					_ => NullWalletCommAdapter::new(),
+				};
+				if adapter.supports_sync() {
+					slate = adapter.send_tx_sync(dest, &slate)?;
+					if method == "self" {
+						controller::foreign_single_use(wallet, |api| {
+							api.receive_tx(&mut slate, Some(dest))?;
+							Ok(())
+						})?;
+					}
+					api.finalize_tx(&mut slate)?;
+				} else {
+					adapter.send_tx_async(dest, &slate)?;
+				}
+				api.tx_lock_outputs(&slate, lock_fn)?;
+				if adapter.supports_sync() {
 					let result = api.post_tx(&slate, fluff);
 					match result {
 						Ok(_) => {
 							info!("Tx sent",);
-								Ok(())
+							return Ok(());
 						}
 						Err(e) => {
 							error!("Tx not sent: {}", e);
-								Err(e)
-							}
-						}
-					} else {
-						return Err(ErrorKind::GenericError(format!(
-							"HTTP Destination should start with http://: or https://: {}",
-							dest
-						)).into());
-					}
-				} else if method == "self" {
-					let result = api.issue_self_tx(
-						amount,
-						minimum_confirmations,
-						max_outputs,
-						change_outputs,
-						selection_strategy == "all",
-						account,
-						dest,
-					);
-					let slate = match result {
-						Ok(s) => {
-							info!(
-								"Tx created: {} grin to self, source acct: {} dest_acct: {} (strategy '{}')",
-								core::amount_to_hr_string(amount, false),
-								account,
-								dest,
-								selection_strategy,
-							);
-							s
-						}
-						Err(e) => {
-							error!("Tx not created: {}", e);
-							match e.kind() {
-								// user errors, don't backtrace
-								libwallet::ErrorKind::NotEnoughFunds { .. } => {}
-								libwallet::ErrorKind::FeeDispute { .. } => {}
-								libwallet::ErrorKind::FeeExceedsAmount { .. } => {}
-								_ => {
-									// otherwise give full dump
-									error!("Backtrace: {}", e.backtrace().unwrap());
-								}
-							};
 							return Err(e);
 						}
-					};
+					}
-					let result = api.post_tx(&slate, fluff);
+				}
-					match result {
-						Ok(_) => {
-							info!("Tx sent",);
 				Ok(())
 			}
-						Err(e) => {
-							error!("Tx not sent: {}", e);
-							Err(e)
-						}
-					}
-				} else if method == "file" {
-					api.send_tx(
-						true,
-						amount,
-						minimum_confirmations,
-						dest,
-						max_outputs,
-						change_outputs,
-						selection_strategy == "all",
-					).map_err(|e| ErrorKind::GenericError(format!("Send failed. e={:?}", e)))?;
-					Ok(())
-				} else {
-					return Err(ErrorKind::GenericError(format!(
-						"unsupported payment method: {}",
-						method
-					)).into());
-				}
-			}
 			("receive", Some(send_args)) => {
 				let mut receive_result: Result<(), grin_wallet::libwallet::Error> = Ok(());
 				let tx_file = send_args.value_of("input").ok_or_else(|| {
@@ -426,18 +375,18 @@ pub fn wallet_command(wallet_args: &ArgMatches, config: GlobalWalletConfig) -> i
 						ErrorKind::GenericError(format!("File {} not found.", tx_file)).into(),
 					);
 				}
-				let res = controller::foreign_single_use(wallet, |api| {
+				let adapter = FileWalletCommAdapter::new();
-					receive_result = api.file_receive_tx(tx_file);
+				let mut slate = adapter.receive_tx_async(tx_file)?;
+				controller::foreign_single_use(wallet, |api| {
+					api.receive_tx(&mut slate, Some(account))?;
 					Ok(())
-				});
+				})?;
-				if res.is_err() {
+				let send_tx = format!("{}.response", tx_file);
-					return res;
+				adapter.send_tx_async(&send_tx, &slate)?;
-				} else {
 				info!(
 					"Response file {}.response generated, sending it back to the transaction originator.",
 					tx_file,
 				);
-				}
 				receive_result
 			}
 			("finalize", Some(send_args)) => {
@@ -450,11 +399,8 @@ pub fn wallet_command(wallet_args: &ArgMatches, config: GlobalWalletConfig) -> i
 						ErrorKind::GenericError(format!("File {} not found.", tx_file)).into(),
 					);
 				}
-				let mut pub_tx_f = File::open(tx_file)?;
+				let adapter = FileWalletCommAdapter::new();
-				let mut content = String::new();
+				let mut slate = adapter.receive_tx_async(tx_file)?;
-				pub_tx_f.read_to_string(&mut content)?;
-				let mut slate: grin_wallet::libtx::slate::Slate = json::from_str(&content)
-					.map_err(|_| grin_wallet::libwallet::ErrorKind::Format)?;
 				let _ = api.finalize_tx(&mut slate).expect("Finalize failed");
 
 				let result = api.post_tx(&slate, fluff);

wallet/src/adapters/file.rs

@@ -0,0 +1,69 @@
+// Copyright 2018 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.
+
+/// File Output 'plugin' implementation
+use std::fs::File;
+use std::io::{Read, Write};
+
+use serde_json as json;
+use std::collections::HashMap;
+
+use libtx::slate::Slate;
+use libwallet::{Error, ErrorKind};
+use {WalletCommAdapter, WalletConfig};
+
+#[derive(Clone)]
+pub struct FileWalletCommAdapter {}
+
+impl FileWalletCommAdapter {
+	/// Create
+	pub fn new() -> Box<WalletCommAdapter> {
+		Box::new(FileWalletCommAdapter {})
+	}
+}
+
+impl WalletCommAdapter for FileWalletCommAdapter {
+	fn supports_sync(&self) -> bool {
+		false
+	}
+
+	fn send_tx_sync(&self, _dest: &str, _slate: &Slate) -> Result<Slate, Error> {
+		unimplemented!();
+	}
+
+	fn send_tx_async(&self, dest: &str, slate: &Slate) -> Result<(), Error> {
+		let mut pub_tx = File::create(dest)?;
+		pub_tx.write_all(json::to_string(&slate).unwrap().as_bytes())?;
+		pub_tx.sync_all()?;
+		Ok(())
+	}
+
+	fn receive_tx_async(&self, params: &str) -> Result<Slate, Error> {
+		let mut pub_tx_f = File::open(params)?;
+		let mut content = String::new();
+		pub_tx_f.read_to_string(&mut content)?;
+		Ok(json::from_str(&content).map_err(|_| ErrorKind::Format)?)
+	}
+
+	fn listen(
+		&self,
+		_params: HashMap<String, String>,
+		_config: WalletConfig,
+		_passphrase: &str,
+		_account: &str,
+		_node_api_secret: Option<String>,
+	) -> Result<(), Error> {
+		unimplemented!();
+	}
+}

wallet/src/adapters/http.rs

@@ -0,0 +1,86 @@
+// Copyright 2018 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.
+
+/// HTTP Wallet 'plugin' implementation
+use failure::ResultExt;
+use std::collections::HashMap;
+
+use api;
+use controller;
+use libtx::slate::Slate;
+use libwallet::{Error, ErrorKind};
+use {instantiate_wallet, WalletCommAdapter, WalletConfig};
+
+#[derive(Clone)]
+pub struct HTTPWalletCommAdapter {}
+
+impl HTTPWalletCommAdapter {
+	/// Create
+	pub fn new() -> Box<WalletCommAdapter> {
+		Box::new(HTTPWalletCommAdapter {})
+	}
+}
+
+impl WalletCommAdapter for HTTPWalletCommAdapter {
+	fn supports_sync(&self) -> bool {
+		true
+	}
+
+	fn send_tx_sync(&self, dest: &str, slate: &Slate) -> Result<Slate, Error> {
+		if &dest[..4] != "http" {
+			let err_str = format!(
+				"dest formatted as {} but send -d expected stdout or http://IP:port",
+				dest
+			);
+			error!("{}", err_str,);
+			Err(ErrorKind::Uri)?
+		}
+		let url = format!("{}/v1/wallet/foreign/receive_tx", dest);
+		debug!("Posting transaction slate to {}", url);
+
+		let res = api::client::post(url.as_str(), None, slate)
+			.context(ErrorKind::ClientCallback("Posting transaction slate"))?;
+		Ok(res)
+	}
+
+	fn send_tx_async(&self, _dest: &str, _slate: &Slate) -> Result<(), Error> {
+		unimplemented!();
+	}
+
+	fn receive_tx_async(&self, _params: &str) -> Result<Slate, Error> {
+		unimplemented!();
+	}
+
+	fn listen(
+		&self,
+		params: HashMap<String, String>,
+		config: WalletConfig,
+		passphrase: &str,
+		account: &str,
+		node_api_secret: Option<String>,
+	) -> Result<(), Error> {
+		let wallet =
+			instantiate_wallet(config.clone(), passphrase, account, node_api_secret.clone());
+		let listen_addr = params.get("api_listen_addr").unwrap();
+		let tls_conf = match params.get("certificate") {
+			Some(s) => Some(api::TLSConfig::new(
+				s.to_owned(),
+				params.get("private_key").unwrap().to_owned(),
+			)),
+			None => None,
+		};
+		controller::foreign_listener(wallet.clone(), &listen_addr, tls_conf)?;
+		Ok(())
+	}
+}

wallet/src/adapters/mod.rs

@@ -0,0 +1,55 @@
+// Copyright 2018 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 file;
+mod http;
+mod null;
+
+pub use self::file::FileWalletCommAdapter;
+pub use self::http::HTTPWalletCommAdapter;
+pub use self::null::NullWalletCommAdapter;
+
+use std::collections::HashMap;
+
+use libtx::slate::Slate;
+use libwallet::Error;
+use WalletConfig;
+
+/// Encapsulate wallet to wallet communication functions
+pub trait WalletCommAdapter {
+	/// Whether this adapter supports sync mode
+	fn supports_sync(&self) -> bool;
+
+	/// Send a transaction slate to another listening wallet and return result
+	/// TODO: Probably need a slate wrapper type
+	fn send_tx_sync(&self, addr: &str, slate: &Slate) -> Result<Slate, Error>;
+
+	/// Send a transaction asynchronously (result will be returned via the listener)
+	fn send_tx_async(&self, addr: &str, slate: &Slate) -> Result<(), Error>;
+
+	/// Receive a transaction async. (Actually just read it from wherever and return the slate)
+	fn receive_tx_async(&self, params: &str) -> Result<Slate, Error>;
+
+	/// Start a listener, passing received messages to the wallet api directly
+	/// Takes a wallet config for now to avoid needing all sorts of awkward
+	/// type parameters on this trait
+	fn listen(
+		&self,
+		params: HashMap<String, String>,
+		config: WalletConfig,
+		passphrase: &str,
+		account: &str,
+		node_api_secret: Option<String>,
+	) -> Result<(), Error>;
+}

wallet/src/adapters/null.rs

@@ -0,0 +1,59 @@
+// Copyright 2018 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.
+
+/// Null Output 'plugin' implementation
+use libtx::slate::Slate;
+use libwallet::Error;
+use {WalletCommAdapter, WalletConfig};
+
+use std::collections::HashMap;
+
+#[derive(Clone)]
+pub struct NullWalletCommAdapter {}
+
+impl NullWalletCommAdapter {
+	/// Create
+	pub fn new() -> Box<NullWalletCommAdapter> {
+		Box::new(NullWalletCommAdapter {})
+	}
+}
+
+impl WalletCommAdapter for NullWalletCommAdapter {
+	fn supports_sync(&self) -> bool {
+		true
+	}
+
+	fn send_tx_sync(&self, _dest: &str, _slate: &Slate) -> Result<Slate, Error> {
+		unimplemented!();
+	}
+
+	fn send_tx_async(&self, _dest: &str, _slate: &Slate) -> Result<(), Error> {
+		unimplemented!();
+	}
+
+	fn receive_tx_async(&self, _params: &str) -> Result<Slate, Error> {
+		unimplemented!();
+	}
+
+	fn listen(
+		&self,
+		_params: HashMap<String, String>,
+		_config: WalletConfig,
+		_passphrase: &str,
+		_account: &str,
+		_node_api_secret: Option<String>,
+	) -> Result<(), Error> {
+		unimplemented!();
+	}
+}

wallet/src/controller.rs

@@ -15,7 +15,9 @@
 //! Controller for wallet.. instantiates and handles listeners (or single-run
 //! invocations) as needed.
 //! Still experimental
+use adapters::{FileWalletCommAdapter, HTTPWalletCommAdapter};
 use api::{ApiServer, BasicAuthMiddleware, Handler, ResponseFuture, Router, TLSConfig};
+use core::core;
 use core::core::Transaction;
 use failure::ResultExt;
 use futures::future::{err, ok};
@@ -25,8 +27,7 @@ use keychain::Keychain;
 use libtx::slate::Slate;
 use libwallet::api::{APIForeign, APIOwner};
 use libwallet::types::{
-	CbData, OutputData, SendTXArgs, TxLogEntry, WalletBackend, WalletInfo, WalletToNodeClient,
+	CbData, NodeClient, OutputData, SendTXArgs, TxLogEntry, WalletBackend, WalletInfo,
-	WalletToWalletClient,
 };
 use libwallet::{Error, ErrorKind};
 use serde::{Deserialize, Serialize};
@@ -42,12 +43,11 @@ use util::Mutex;
 
 /// Instantiate wallet Owner API for a single-use (command line) call
 /// Return a function containing a loaded API context to call
-pub fn owner_single_use<F, T: ?Sized, C, L, K>(wallet: Arc<Mutex<T>>, f: F) -> Result<(), Error>
+pub fn owner_single_use<F, T: ?Sized, C, K>(wallet: Arc<Mutex<T>>, f: F) -> Result<(), Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	F: FnOnce(&mut APIOwner<T, C, L, K>) -> Result<(), Error>,
+	F: FnOnce(&mut APIOwner<T, C, K>) -> Result<(), Error>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	f(&mut APIOwner::new(wallet.clone()))?;
@@ -56,12 +56,11 @@ where
 
 /// Instantiate wallet Foreign API for a single-use (command line) call
 /// Return a function containing a loaded API context to call
-pub fn foreign_single_use<F, T: ?Sized, C, L, K>(wallet: Arc<Mutex<T>>, f: F) -> Result<(), Error>
+pub fn foreign_single_use<F, T: ?Sized, C, K>(wallet: Arc<Mutex<T>>, f: F) -> Result<(), Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	F: FnOnce(&mut APIForeign<T, C, L, K>) -> Result<(), Error>,
+	F: FnOnce(&mut APIForeign<T, C, K>) -> Result<(), Error>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	f(&mut APIForeign::new(wallet.clone()))?;
@@ -70,17 +69,16 @@ where
 
 /// Listener version, providing same API but listening for requests on a
 /// port and wrapping the calls
-pub fn owner_listener<T: ?Sized, C, L, K>(
+pub fn owner_listener<T: ?Sized, C, K>(
 	wallet: Arc<Mutex<T>>,
 	addr: &str,
 	api_secret: Option<String>,
 	tls_config: Option<TLSConfig>,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<C, L, K> + Send + Sync + 'static,
+	T: WalletBackend<C, K> + Send + Sync + 'static,
-	OwnerAPIHandler<T, C, L, K>: Handler,
+	OwnerAPIHandler<T, C, K>: Handler,
-	C: WalletToNodeClient + 'static,
+	C: NodeClient + 'static,
-	L: WalletToWalletClient + 'static,
 	K: Keychain + 'static,
 {
 	let api_handler = OwnerAPIHandler::new(wallet);
@@ -112,15 +110,14 @@ where
 
 /// Listener version, providing same API but listening for requests on a
 /// port and wrapping the calls
-pub fn foreign_listener<T: ?Sized, C, L, K>(
+pub fn foreign_listener<T: ?Sized, C, K>(
 	wallet: Arc<Mutex<T>>,
 	addr: &str,
 	tls_config: Option<TLSConfig>,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<C, L, K> + Send + Sync + 'static,
+	T: WalletBackend<C, K> + Send + Sync + 'static,
-	C: WalletToNodeClient + 'static,
+	C: NodeClient + 'static,
-	L: WalletToWalletClient + 'static,
 	K: Keychain + 'static,
 {
 	let api_handler = ForeignAPIHandler::new(wallet);
@@ -147,41 +144,37 @@ where
 type WalletResponseFuture = Box<Future<Item = Response<Body>, Error = Error> + Send>;
 
 /// API Handler/Wrapper for owner functions
-pub struct OwnerAPIHandler<T: ?Sized, C, L, K>
+pub struct OwnerAPIHandler<T: ?Sized, C, K>
 where
-	T: WalletBackend<C, L, K> + Send + Sync + 'static,
+	T: WalletBackend<C, K> + Send + Sync + 'static,
-	C: WalletToNodeClient + 'static,
+	C: NodeClient + 'static,
-	L: WalletToWalletClient + 'static,
 	K: Keychain + 'static,
 {
 	/// Wallet instance
 	pub wallet: Arc<Mutex<T>>,
 	phantom: PhantomData<K>,
 	phantom_c: PhantomData<C>,
-	phantom_l: PhantomData<L>,
 }
 
-impl<T: ?Sized, C, L, K> OwnerAPIHandler<T, C, L, K>
+impl<T: ?Sized, C, K> OwnerAPIHandler<T, C, K>
 where
-	T: WalletBackend<C, L, K> + Send + Sync + 'static,
+	T: WalletBackend<C, K> + Send + Sync + 'static,
-	C: WalletToNodeClient + 'static,
+	C: NodeClient + 'static,
-	L: WalletToWalletClient + 'static,
 	K: Keychain + 'static,
 {
 	/// Create a new owner API handler for GET methods
-	pub fn new(wallet: Arc<Mutex<T>>) -> OwnerAPIHandler<T, C, L, K> {
+	pub fn new(wallet: Arc<Mutex<T>>) -> OwnerAPIHandler<T, C, K> {
 		OwnerAPIHandler {
 			wallet,
 			phantom: PhantomData,
 			phantom_c: PhantomData,
-			phantom_l: PhantomData,
 		}
 	}
 
 	fn retrieve_outputs(
 		&self,
 		req: &Request<Body>,
-		api: APIOwner<T, C, L, K>,
+		api: APIOwner<T, C, K>,
 	) -> Result<(bool, Vec<(OutputData, pedersen::Commitment)>), Error> {
 		let mut update_from_node = false;
 		let mut id = None;
@@ -205,7 +198,7 @@ where
 	fn retrieve_txs(
 		&self,
 		req: &Request<Body>,
-		api: APIOwner<T, C, L, K>,
+		api: APIOwner<T, C, K>,
 	) -> Result<(bool, Vec<TxLogEntry>), Error> {
 		let mut tx_id = None;
 		let mut tx_slate_id = None;
@@ -232,7 +225,7 @@ where
 	fn dump_stored_tx(
 		&self,
 		req: &Request<Body>,
-		api: APIOwner<T, C, L, K>,
+		api: APIOwner<T, C, K>,
 	) -> Result<Transaction, Error> {
 		let params = parse_params(req);
 		if let Some(id_string) = params.get("id") {
@@ -261,7 +254,7 @@ where
 	fn retrieve_summary_info(
 		&self,
 		req: &Request<Body>,
-		mut api: APIOwner<T, C, L, K>,
+		mut api: APIOwner<T, C, K>,
 	) -> Result<(bool, WalletInfo), Error> {
 		let update_from_node = param_exists(req, "refresh");
 		api.retrieve_summary_info(update_from_node)
@@ -270,7 +263,7 @@ where
 	fn node_height(
 		&self,
 		_req: &Request<Body>,
-		mut api: APIOwner<T, C, L, K>,
+		mut api: APIOwner<T, C, K>,
 	) -> Result<(u64, bool), Error> {
 		api.node_height()
 	}
@@ -298,39 +291,62 @@ where
 	fn issue_send_tx(
 		&self,
 		req: Request<Body>,
-		mut api: APIOwner<T, C, L, K>,
+		mut api: APIOwner<T, C, K>,
 	) -> Box<Future<Item = Slate, Error = Error> + Send> {
 		Box::new(parse_body(req).and_then(move |args: SendTXArgs| {
+			let result = api.initiate_tx(
+				None,
+				args.amount,
+				args.minimum_confirmations,
+				args.max_outputs,
+				args.num_change_outputs,
+				args.selection_strategy_is_use_all,
+			);
+			let (mut slate, lock_fn) = match result {
+				Ok(s) => {
+					info!(
+						"Tx created: {} grin to {} (strategy '{}')",
+						core::amount_to_hr_string(args.amount, false),
+						&args.dest,
+						args.selection_strategy_is_use_all,
+					);
+					s
+				}
+				Err(e) => {
+					error!("Tx not created: {}", e);
+					match e.kind() {
+						// user errors, don't backtrace
+						ErrorKind::NotEnoughFunds { .. } => {}
+						ErrorKind::FeeDispute { .. } => {}
+						ErrorKind::FeeExceedsAmount { .. } => {}
+						_ => {
+							// otherwise give full dump
+							error!("Backtrace: {}", e.backtrace().unwrap());
+						}
+					};
+					return Err(e);
+				}
+			};
 			if args.method == "http" {
-				api.issue_send_tx(
+				let adapter = HTTPWalletCommAdapter::new();
-					args.amount,
+				slate = adapter.send_tx_sync(&args.dest, &slate)?;
-					args.minimum_confirmations,
+				api.finalize_tx(&mut slate)?;
-					&args.dest,
-					args.max_outputs,
-					args.num_change_outputs,
-					args.selection_strategy_is_use_all,
-				)
 			} else if args.method == "file" {
-				api.send_tx(
+				let adapter = FileWalletCommAdapter::new();
-					false,
+				adapter.send_tx_async(&args.dest, &slate)?;
-					args.amount,
-					args.minimum_confirmations,
-					&args.dest,
-					args.max_outputs,
-					args.num_change_outputs,
-					args.selection_strategy_is_use_all,
-				)
 			} else {
 				error!("unsupported payment method: {}", args.method);
 				return Err(ErrorKind::ClientCallback("unsupported payment method"))?;
 			}
+			api.tx_lock_outputs(&slate, lock_fn)?;
+			Ok(slate)
 		}))
 	}
 
 	fn finalize_tx(
 		&self,
 		req: Request<Body>,
-		mut api: APIOwner<T, C, L, K>,
+		mut api: APIOwner<T, C, K>,
 	) -> Box<Future<Item = Slate, Error = Error> + Send> {
 		Box::new(
 			parse_body(req).and_then(move |mut slate| match api.finalize_tx(&mut slate) {
@@ -346,7 +362,7 @@ where
 	fn cancel_tx(
 		&self,
 		req: Request<Body>,
-		mut api: APIOwner<T, C, L, K>,
+		mut api: APIOwner<T, C, K>,
 	) -> Box<Future<Item = (), Error = Error> + Send> {
 		let params = parse_params(&req);
 		if let Some(id_string) = params.get("id") {
@@ -391,7 +407,7 @@ where
 	fn post_tx(
 		&self,
 		req: Request<Body>,
-		api: APIOwner<T, C, L, K>,
+		api: APIOwner<T, C, K>,
 	) -> Box<Future<Item = (), Error = Error> + Send> {
 		let params = match req.uri().query() {
 			Some(query_string) => form_urlencoded::parse(query_string.as_bytes())
@@ -417,7 +433,7 @@ where
 	fn issue_burn_tx(
 		&self,
 		_req: Request<Body>,
-		mut api: APIOwner<T, C, L, K>,
+		mut api: APIOwner<T, C, K>,
 	) -> Box<Future<Item = (), Error = Error> + Send> {
 		// TODO: Args
 		Box::new(match api.issue_burn_tx(60, 10, 1000) {
@@ -463,11 +479,10 @@ where
 	}
 }
 
-impl<T: ?Sized, C, L, K> Handler for OwnerAPIHandler<T, C, L, K>
+impl<T: ?Sized, C, K> Handler for OwnerAPIHandler<T, C, K>
 where
-	T: WalletBackend<C, L, K> + Send + Sync + 'static,
+	T: WalletBackend<C, K> + Send + Sync + 'static,
-	C: WalletToNodeClient + 'static,
+	C: NodeClient + 'static,
-	L: WalletToWalletClient + 'static,
 	K: Keychain + 'static,
 {
 	fn get(&self, req: Request<Body>) -> ResponseFuture {
@@ -498,41 +513,37 @@ where
 
 /// API Handler/Wrapper for foreign functions
 
-pub struct ForeignAPIHandler<T: ?Sized, C, L, K>
+pub struct ForeignAPIHandler<T: ?Sized, C, K>
 where
-	T: WalletBackend<C, L, K> + Send + Sync + 'static,
+	T: WalletBackend<C, K> + Send + Sync + 'static,
-	C: WalletToNodeClient + 'static,
+	C: NodeClient + 'static,
-	L: WalletToWalletClient + 'static,
 	K: Keychain + 'static,
 {
 	/// Wallet instance
 	pub wallet: Arc<Mutex<T>>,
 	phantom: PhantomData<K>,
 	phantom_c: PhantomData<C>,
-	phantom_l: PhantomData<L>,
 }
 
-impl<T: ?Sized, C, L, K> ForeignAPIHandler<T, C, L, K>
+impl<T: ?Sized, C, K> ForeignAPIHandler<T, C, K>
 where
-	T: WalletBackend<C, L, K> + Send + Sync + 'static,
+	T: WalletBackend<C, K> + Send + Sync + 'static,
-	C: WalletToNodeClient + 'static,
+	C: NodeClient + 'static,
-	L: WalletToWalletClient + 'static,
 	K: Keychain + 'static,
 {
 	/// create a new api handler
-	pub fn new(wallet: Arc<Mutex<T>>) -> ForeignAPIHandler<T, C, L, K> {
+	pub fn new(wallet: Arc<Mutex<T>>) -> ForeignAPIHandler<T, C, K> {
 		ForeignAPIHandler {
 			wallet,
 			phantom: PhantomData,
 			phantom_c: PhantomData,
-			phantom_l: PhantomData,
 		}
 	}
 
 	fn build_coinbase(
 		&self,
 		req: Request<Body>,
-		mut api: APIForeign<T, C, L, K>,
+		mut api: APIForeign<T, C, K>,
 	) -> Box<Future<Item = CbData, Error = Error> + Send> {
 		Box::new(parse_body(req).and_then(move |block_fees| api.build_coinbase(&block_fees)))
 	}
@@ -540,17 +551,17 @@ where
 	fn receive_tx(
 		&self,
 		req: Request<Body>,
-		mut api: APIForeign<T, C, L, K>,
+		mut api: APIForeign<T, C, K>,
 	) -> Box<Future<Item = Slate, Error = Error> + Send> {
-		Box::new(
+		Box::new(parse_body(req).and_then(
-			parse_body(req).and_then(move |mut slate| match api.receive_tx(&mut slate) {
+			move |mut slate| match api.receive_tx(&mut slate, None) {
 				Ok(_) => ok(slate.clone()),
 				Err(e) => {
 					error!("receive_tx: failed with error: {}", e);
 					err(e)
 				}
-			}),
+			},
-		)
+		))
 	}
 
 	fn handle_request(&self, req: Request<Body>) -> WalletResponseFuture {
@@ -575,11 +586,10 @@ where
 		}
 	}
 }
-impl<T: ?Sized, C, L, K> Handler for ForeignAPIHandler<T, C, L, K>
+impl<T: ?Sized, C, K> Handler for ForeignAPIHandler<T, C, K>
 where
-	T: WalletBackend<C, L, K> + Send + Sync + 'static,
+	T: WalletBackend<C, K> + Send + Sync + 'static,
-	C: WalletToNodeClient + Send + Sync + 'static,
+	C: NodeClient + Send + Sync + 'static,
-	L: WalletToWalletClient + Send + Sync + 'static,
 	K: Keychain + 'static,
 {
 	fn post(&self, req: Request<Body>) -> ResponseFuture {

wallet/src/lib.rs

@@ -45,20 +45,48 @@ extern crate grin_keychain as keychain;
 extern crate grin_store as store;
 extern crate grin_util as util;
 
-mod client;
+mod adapters;
+pub mod controller;
 pub mod display;
 mod error;
 pub mod libtx;
 pub mod libwallet;
 pub mod lmdb_wallet;
+mod node_clients;
 mod types;
 
-pub use client::{create_coinbase, HTTPWalletToNodeClient, HTTPWalletToWalletClient};
+pub use adapters::{
-pub use error::{Error, ErrorKind};
+	FileWalletCommAdapter, HTTPWalletCommAdapter, NullWalletCommAdapter, WalletCommAdapter,
-pub use libwallet::controller;
-pub use libwallet::types::{
-	BlockFees, CbData, WalletBackend, WalletInfo, WalletInst, WalletToNodeClient,
-	WalletToWalletClient,
 };
+pub use error::{Error, ErrorKind};
+pub use libwallet::types::{BlockFees, CbData, NodeClient, WalletBackend, WalletInfo, WalletInst};
 pub use lmdb_wallet::{wallet_db_exists, LMDBBackend};
+pub use node_clients::{create_coinbase, HTTPNodeClient};
 pub use types::{WalletConfig, WalletSeed, SEED_FILE};
+
+use std::sync::Arc;
+use util::Mutex;
+
+/// Helper to create an instance of the LMDB wallet
+pub fn instantiate_wallet(
+	wallet_config: WalletConfig,
+	passphrase: &str,
+	account: &str,
+	node_api_secret: Option<String>,
+) -> Arc<Mutex<WalletInst<HTTPNodeClient, keychain::ExtKeychain>>> {
+	let client_n = HTTPNodeClient::new(&wallet_config.check_node_api_http_addr, node_api_secret);
+	let mut db_wallet = LMDBBackend::new(wallet_config.clone(), passphrase, client_n)
+		.unwrap_or_else(|e| {
+			panic!(
+				"Error creating DB wallet: {} Config: {:?}",
+				e, wallet_config
+			);
+		});
+	db_wallet
+		.set_parent_key_id_by_name(account)
+		.unwrap_or_else(|e| {
+			panic!("Error starting wallet: {}", e);
+		});
+	info!("Using LMDB Backend for wallet");
+	Arc::new(Mutex::new(db_wallet))
+}

wallet/src/libwallet/api.rs

@@ -18,7 +18,7 @@
 //! Still experimental, not sure this is the best way to do this
 
 use std::fs::File;
-use std::io::{Read, Write};
+use std::io::Write;
 use std::marker::PhantomData;
 use std::sync::Arc;
 use util::Mutex;
@@ -31,10 +31,10 @@ use core::core::Transaction;
 use core::ser;
 use keychain::{Identifier, Keychain};
 use libtx::slate::Slate;
-use libwallet::internal::{keys, selection, tx, updater};
+use libwallet::internal::{keys, tx, updater};
 use libwallet::types::{
-	AcctPathMapping, BlockFees, CbData, OutputData, TxLogEntry, TxWrapper, WalletBackend,
+	AcctPathMapping, BlockFees, CbData, NodeClient, OutputData, TxLogEntry, TxWrapper,
-	WalletInfo, WalletToNodeClient, WalletToWalletClient,
+	WalletBackend, WalletInfo,
 };
 use libwallet::{Error, ErrorKind};
 use util;
@@ -42,11 +42,10 @@ use util::secp::pedersen;
 
 /// Wrapper around internal API functions, containing a reference to
 /// the wallet/keychain that they're acting upon
-pub struct APIOwner<W: ?Sized, C, L, K>
+pub struct APIOwner<W: ?Sized, C, K>
 where
-	W: WalletBackend<C, L, K>,
+	W: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	/// Wallet, contains its keychain (TODO: Split these up into 2 traits
@@ -54,14 +53,12 @@ where
 	pub wallet: Arc<Mutex<W>>,
 	phantom: PhantomData<K>,
 	phantom_c: PhantomData<C>,
-	phantom_l: PhantomData<L>,
 }
 
-impl<W: ?Sized, C, L, K> APIOwner<W, C, L, K>
+impl<W: ?Sized, C, K> APIOwner<W, C, K>
 where
-	W: WalletBackend<C, L, K>,
+	W: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	/// Create new API instance
@@ -70,7 +67,6 @@ where
 			wallet: wallet_in,
 			phantom: PhantomData,
 			phantom_c: PhantomData,
-			phantom_l: PhantomData,
 		}
 	}
 
@@ -160,117 +156,29 @@ where
 		keys::new_acct_path(&mut *w, label)
 	}
 
-	/// Issues a send transaction and sends to recipient
+	/// Creates a new partial transaction for the given amount
-	pub fn issue_send_tx(
+	pub fn initiate_tx(
 		&mut self,
+		src_acct_name: Option<&str>,
 		amount: u64,
 		minimum_confirmations: u64,
-		dest: &str,
 		max_outputs: usize,
 		num_change_outputs: usize,
 		selection_strategy_is_use_all: bool,
-	) -> Result<Slate, Error> {
+	) -> Result<(Slate, impl FnOnce(&mut W, &str) -> Result<(), Error>), Error> {
 		let mut w = self.wallet.lock();
 		w.open_with_credentials()?;
-		let parent_key_id = w.parent_key_id();
+		let parent_key_id = match src_acct_name {
-
+			Some(d) => {
-		let client;
+				let pm = w.get_acct_path(d.to_owned())?;
-		let mut slate_out: Slate;
+				match pm {
-		let lock_fn_out;
+					Some(p) => p.path,
-
+					None => w.parent_key_id(),
-		client = w.w2w_client().clone();
-		let (slate, context, lock_fn) = tx::create_send_tx(
-			&mut *w,
-			amount,
-			minimum_confirmations,
-			max_outputs,
-			num_change_outputs,
-			selection_strategy_is_use_all,
-			&parent_key_id,
-			false,
-		)?;
-
-		lock_fn_out = lock_fn;
-		slate_out = match client.send_tx_slate(dest, &slate) {
-			Ok(s) => s,
-			Err(e) => {
-				error!(
-				"Communication with receiver failed on SenderInitiation send. Aborting transaction {:?}",
-				e,
-			);
-				return Err(e)?;
 				}
+			}
+			None => w.parent_key_id(),
 		};
 
-		tx::complete_tx(&mut *w, &mut slate_out, &context)?;
-		let tx_hex = util::to_hex(ser::ser_vec(&slate_out.tx).unwrap());
-
-		// lock our inputs
-		lock_fn_out(&mut *w, &tx_hex)?;
-		w.close()?;
-		Ok(slate_out)
-	}
-
-	/// Issues a send transaction to the same wallet, without needing communication
-	/// good for consolidating outputs, or can be extended to split outputs to multiple
-	/// accounts
-	pub fn issue_self_tx(
-		&mut self,
-		amount: u64,
-		minimum_confirmations: u64,
-		max_outputs: usize,
-		num_change_outputs: usize,
-		selection_strategy_is_use_all: bool,
-		src_acct_name: &str,
-		dest_acct_name: &str,
-	) -> Result<Slate, Error> {
-		let mut w = self.wallet.lock();
-		w.open_with_credentials()?;
-		let orig_parent_key_id = w.parent_key_id();
-		w.set_parent_key_id_by_name(src_acct_name)?;
-		let parent_key_id = w.parent_key_id();
-
-		let (mut slate, context, lock_fn) = tx::create_send_tx(
-			&mut *w,
-			amount,
-			minimum_confirmations,
-			max_outputs,
-			num_change_outputs,
-			selection_strategy_is_use_all,
-			&parent_key_id,
-			true,
-		)?;
-
-		w.set_parent_key_id_by_name(dest_acct_name)?;
-		let parent_key_id = w.parent_key_id();
-		tx::receive_tx(&mut *w, &mut slate, &parent_key_id, true)?;
-
-		tx::complete_tx(&mut *w, &mut slate, &context)?;
-		let tx_hex = util::to_hex(ser::ser_vec(&slate.tx).unwrap());
-
-		// lock our inputs
-		lock_fn(&mut *w, &tx_hex)?;
-		w.set_parent_key_id(orig_parent_key_id);
-		w.close()?;
-		Ok(slate)
-	}
-
-	/// Write a transaction to send to file so a user can transmit it to the
-	/// receiver in whichever way they see fit (aka carrier pigeon mode).
-	pub fn send_tx(
-		&mut self,
-		write_to_disk: bool,
-		amount: u64,
-		minimum_confirmations: u64,
-		dest: &str,
-		max_outputs: usize,
-		num_change_outputs: usize,
-		selection_strategy_is_use_all: bool,
-	) -> Result<Slate, Error> {
-		let mut w = self.wallet.lock();
-		w.open_with_credentials()?;
-		let parent_key_id = w.parent_key_id();
-
 		let (slate, context, lock_fn) = tx::create_send_tx(
 			&mut *w,
 			amount,
@@ -281,24 +189,30 @@ where
 			&parent_key_id,
 			false,
 		)?;
-		if write_to_disk {
-			let mut pub_tx = File::create(dest)?;
-			pub_tx.write_all(json::to_string(&slate).unwrap().as_bytes())?;
-			pub_tx.sync_all()?;
-		}
 
+		// Save the aggsig context in our DB for when we
+		// recieve the transaction back
 		{
 			let mut batch = w.batch()?;
 			batch.save_private_context(slate.id.as_bytes(), &context)?;
 			batch.commit()?;
 		}
 
-		let tx_hex = util::to_hex(ser::ser_vec(&slate.tx).unwrap());
-
-		// lock our inputs
-		lock_fn(&mut *w, &tx_hex)?;
 		w.close()?;
-		Ok(slate)
+		Ok((slate, lock_fn))
+	}
+
+	/// Lock outputs associated with a given slate/transaction
+	pub fn tx_lock_outputs(
+		&mut self,
+		slate: &Slate,
+		lock_fn: impl FnOnce(&mut W, &str) -> Result<(), Error>,
+	) -> Result<(), Error> {
+		let mut w = self.wallet.lock();
+		w.open_with_credentials()?;
+		let tx_hex = util::to_hex(ser::ser_vec(&slate.tx).unwrap());
+		lock_fn(&mut *w, &tx_hex)?;
+		Ok(())
 	}
 
 	/// Sender finalization of the transaction. Takes the file returned by the
@@ -308,7 +222,6 @@ where
 	pub fn finalize_tx(&mut self, slate: &mut Slate) -> Result<(), Error> {
 		let mut w = self.wallet.lock();
 		w.open_with_credentials()?;
-
 		let context = w.get_private_context(slate.id.as_bytes())?;
 		tx::complete_tx(&mut *w, slate, &context)?;
 		{
@@ -513,11 +426,10 @@ where
 
 /// Wrapper around external API functions, intended to communicate
 /// with other parties
-pub struct APIForeign<W: ?Sized, C, L, K>
+pub struct APIForeign<W: ?Sized, C, K>
 where
-	W: WalletBackend<C, L, K>,
+	W: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	/// Wallet, contains its keychain (TODO: Split these up into 2 traits
@@ -525,14 +437,12 @@ where
 	pub wallet: Arc<Mutex<W>>,
 	phantom: PhantomData<K>,
 	phantom_c: PhantomData<C>,
-	phantom_l: PhantomData<L>,
 }
 
-impl<'a, W: ?Sized, C, L, K> APIForeign<W, C, L, K>
+impl<'a, W: ?Sized, C, K> APIForeign<W, C, K>
 where
-	W: WalletBackend<C, L, K>,
+	W: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	/// Create new API instance
@@ -541,7 +451,6 @@ where
 			wallet: wallet_in,
 			phantom: PhantomData,
 			phantom_c: PhantomData,
-			phantom_l: PhantomData,
 		})
 	}
 
@@ -554,52 +463,24 @@ where
 		res
 	}
 
-	/// A sender provided a transaction file with appropriate public keys and
-	/// metadata. Complete the receivers' end of it to generate another file
-	/// to send back.
-	pub fn file_receive_tx(&mut self, source: &str) -> Result<(), Error> {
-		let mut pub_tx_f = File::open(source)?;
-		let mut content = String::new();
-		pub_tx_f.read_to_string(&mut content)?;
-		let mut slate: Slate = json::from_str(&content).map_err(|_| ErrorKind::Format)?;
-
-		let mut wallet = self.wallet.lock();
-		wallet.open_with_credentials()?;
-		let parent_key_id = wallet.parent_key_id();
-
-		// create an output using the amount in the slate
-		let (_, mut context, receiver_create_fn) = selection::build_recipient_output_with_slate(
-			&mut *wallet,
-			&mut slate,
-			parent_key_id,
-			false,
-		)?;
-
-		// fill public keys
-		let _ = slate.fill_round_1(
-			wallet.keychain(),
-			&mut context.sec_key,
-			&context.sec_nonce,
-			1,
-		)?;
-
-		// perform partial sig
-		let _ = slate.fill_round_2(wallet.keychain(), &context.sec_key, &context.sec_nonce, 1)?;
-
-		// save to file
-		let mut pub_tx = File::create(source.to_owned() + ".response")?;
-		pub_tx.write_all(json::to_string(&slate).unwrap().as_bytes())?;
-
-		// Save output in wallet
-		let _ = receiver_create_fn(&mut wallet);
-		Ok(())
-	}
-
 	/// Receive a transaction from a sender
-	pub fn receive_tx(&mut self, slate: &mut Slate) -> Result<(), Error> {
+	pub fn receive_tx(
+		&mut self,
+		slate: &mut Slate,
+		dest_acct_name: Option<&str>,
+	) -> Result<(), Error> {
 		let mut w = self.wallet.lock();
 		w.open_with_credentials()?;
-		let parent_key_id = w.parent_key_id();
+		let parent_key_id = match dest_acct_name {
+			Some(d) => {
+				let pm = w.get_acct_path(d.to_owned())?;
+				match pm {
+					Some(p) => p.path,
+					None => w.parent_key_id(),
+				}
+			}
+			None => w.parent_key_id(),
+		};
 		let res = tx::receive_tx(&mut *w, slate, &parent_key_id, false);
 		w.close()?;
 

wallet/src/libwallet/internal/keys.rs

@@ -15,14 +15,13 @@
 //! Wallet key management functions
 use keychain::{ChildNumber, ExtKeychain, Identifier, Keychain};
 use libwallet::error::{Error, ErrorKind};
-use libwallet::types::{AcctPathMapping, WalletBackend, WalletToNodeClient, WalletToWalletClient};
+use libwallet::types::{AcctPathMapping, NodeClient, WalletBackend};
 
 /// Get next available key in the wallet for a given parent
-pub fn next_available_key<T: ?Sized, C, L, K>(wallet: &mut T) -> Result<Identifier, Error>
+pub fn next_available_key<T: ?Sized, C, K>(wallet: &mut T) -> Result<Identifier, Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	let child = wallet.next_child()?;
@@ -30,14 +29,13 @@ where
 }
 
 /// Retrieve an existing key from a wallet
-pub fn retrieve_existing_key<T: ?Sized, C, L, K>(
+pub fn retrieve_existing_key<T: ?Sized, C, K>(
 	wallet: &T,
 	key_id: Identifier,
 ) -> Result<(Identifier, u32), Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	let existing = wallet.get(&key_id)?;
@@ -47,22 +45,20 @@ where
 }
 
 /// Returns a list of account to BIP32 path mappings
-pub fn accounts<T: ?Sized, C, L, K>(wallet: &mut T) -> Result<Vec<AcctPathMapping>, Error>
+pub fn accounts<T: ?Sized, C, K>(wallet: &mut T) -> Result<Vec<AcctPathMapping>, Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	Ok(wallet.acct_path_iter().collect())
 }
 
 /// Adds an new parent account path with a given label
-pub fn new_acct_path<T: ?Sized, C, L, K>(wallet: &mut T, label: &str) -> Result<Identifier, Error>
+pub fn new_acct_path<T: ?Sized, C, K>(wallet: &mut T, label: &str) -> Result<Identifier, Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	let label = label.to_owned();
@@ -100,15 +96,14 @@ where
 }
 
 /// Adds/sets a particular account path with a given label
-pub fn set_acct_path<T: ?Sized, C, L, K>(
+pub fn set_acct_path<T: ?Sized, C, K>(
 	wallet: &mut T,
 	label: &str,
 	path: &Identifier,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	let label = label.to_owned();

wallet/src/libwallet/internal/restore.rs

@@ -42,14 +42,13 @@ struct OutputResult {
 	pub blinding: SecretKey,
 }
 
-fn identify_utxo_outputs<T, C, L, K>(
+fn identify_utxo_outputs<T, C, K>(
 	wallet: &mut T,
 	outputs: Vec<(pedersen::Commitment, pedersen::RangeProof, bool, u64)>,
 ) -> Result<Vec<OutputResult>, Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	let mut wallet_outputs: Vec<OutputResult> = Vec::new();
@@ -99,11 +98,10 @@ where
 }
 
 /// Restore a wallet
-pub fn restore<T, C, L, K>(wallet: &mut T) -> Result<(), Error>
+pub fn restore<T, C, K>(wallet: &mut T) -> Result<(), Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	// Don't proceed if wallet_data has anything in it

wallet/src/libwallet/internal/selection.rs

@@ -25,7 +25,7 @@ use libwallet::types::*;
 /// and saves the private wallet identifiers of our selected outputs
 /// into our transaction context
 
-pub fn build_send_tx_slate<T: ?Sized, C, L, K>(
+pub fn build_send_tx_slate<T: ?Sized, C, K>(
 	wallet: &mut T,
 	num_participants: usize,
 	amount: u64,
@@ -46,9 +46,8 @@ pub fn build_send_tx_slate<T: ?Sized, C, L, K>(
 	Error,
 >
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	let (elems, inputs, change_amounts_derivations, amount, fee) = select_send_tx(
@@ -145,7 +144,7 @@ where
 /// returning the key of the fresh output and a closure
 /// that actually performs the addition of the output to the
 /// wallet
-pub fn build_recipient_output_with_slate<T: ?Sized, C, L, K>(
+pub fn build_recipient_output_with_slate<T: ?Sized, C, K>(
 	wallet: &mut T,
 	slate: &mut Slate,
 	parent_key_id: Identifier,
@@ -159,9 +158,8 @@ pub fn build_recipient_output_with_slate<T: ?Sized, C, L, K>(
 	Error,
 >
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	// Create a potential output for this transaction
@@ -219,7 +217,7 @@ 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<T: ?Sized, C, L, K>(
+pub fn select_send_tx<T: ?Sized, C, K>(
 	wallet: &mut T,
 	amount: u64,
 	current_height: u64,
@@ -240,9 +238,8 @@ pub fn select_send_tx<T: ?Sized, C, L, K>(
 	Error,
 >
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	// select some spendable coins from the wallet
@@ -329,7 +326,7 @@ where
 }
 
 /// Selects inputs and change for a transaction
-pub fn inputs_and_change<T: ?Sized, C, L, K>(
+pub fn inputs_and_change<T: ?Sized, C, K>(
 	coins: &Vec<OutputData>,
 	wallet: &mut T,
 	amount: u64,
@@ -337,9 +334,8 @@ pub fn inputs_and_change<T: ?Sized, C, L, K>(
 	num_change_outputs: usize,
 ) -> Result<(Vec<Box<build::Append<K>>>, Vec<(u64, Identifier)>), Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	let mut parts = vec![];
@@ -401,7 +397,7 @@ where
 /// 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<T: ?Sized, C, L, K>(
+pub fn select_coins<T: ?Sized, C, K>(
 	wallet: &mut T,
 	amount: u64,
 	current_height: u64,
@@ -412,9 +408,8 @@ pub fn select_coins<T: ?Sized, C, L, K>(
 ) -> (usize, Vec<OutputData>)
 //    max_outputs_available, Outputs
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	// first find all eligible outputs based on number of confirmations

wallet/src/libwallet/internal/tx.rs

@@ -24,23 +24,20 @@ use keychain::{Identifier, Keychain};
 use libtx::slate::Slate;
 use libtx::{build, tx_fee};
 use libwallet::internal::{selection, updater};
-use libwallet::types::{
+use libwallet::types::{Context, NodeClient, TxLogEntryType, WalletBackend};
-	Context, TxLogEntryType, WalletBackend, WalletToNodeClient, WalletToWalletClient,
-};
 use libwallet::{Error, ErrorKind};
 
 /// Receive a transaction, modifying the slate accordingly (which can then be
 /// sent back to sender for posting)
-pub fn receive_tx<T: ?Sized, C, L, K>(
+pub fn receive_tx<T: ?Sized, C, K>(
 	wallet: &mut T,
 	slate: &mut Slate,
 	parent_key_id: &Identifier,
 	is_self: bool,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	// create an output using the amount in the slate
@@ -70,7 +67,7 @@ where
 
 /// Issue a new transaction to the provided sender by spending some of our
 /// wallet
-pub fn create_send_tx<T: ?Sized, C, L, K>(
+pub fn create_send_tx<T: ?Sized, C, K>(
 	wallet: &mut T,
 	amount: u64,
 	minimum_confirmations: u64,
@@ -88,9 +85,8 @@ pub fn create_send_tx<T: ?Sized, C, L, K>(
 	Error,
 >
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	// Get lock height
@@ -135,15 +131,14 @@ where
 }
 
 /// Complete a transaction as the sender
-pub fn complete_tx<T: ?Sized, C, L, K>(
+pub fn complete_tx<T: ?Sized, C, K>(
 	wallet: &mut T,
 	slate: &mut Slate,
 	context: &Context,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	let _ = slate.fill_round_2(wallet.keychain(), &context.sec_key, &context.sec_nonce, 0)?;
@@ -156,16 +151,15 @@ where
 }
 
 /// Rollback outputs associated with a transaction in the wallet
-pub fn cancel_tx<T: ?Sized, C, L, K>(
+pub fn cancel_tx<T: ?Sized, C, K>(
 	wallet: &mut T,
 	parent_key_id: &Identifier,
 	tx_id: Option<u32>,
 	tx_slate_id: Option<Uuid>,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	let mut tx_id_string = String::new();
@@ -194,15 +188,14 @@ where
 
 /// Retrieve the associated stored finalised hex Transaction for a given transaction Id
 /// as well as whether it's been confirmed
-pub fn retrieve_tx_hex<T: ?Sized, C, L, K>(
+pub fn retrieve_tx_hex<T: ?Sized, C, K>(
 	wallet: &mut T,
 	parent_key_id: &Identifier,
 	tx_id: u32,
 ) -> Result<(bool, Option<String>), Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	let tx_vec = updater::retrieve_txs(wallet, Some(tx_id), None, parent_key_id)?;
@@ -214,7 +207,7 @@ where
 }
 
 /// Issue a burn tx
-pub fn issue_burn_tx<T: ?Sized, C, L, K>(
+pub fn issue_burn_tx<T: ?Sized, C, K>(
 	wallet: &mut T,
 	amount: u64,
 	minimum_confirmations: u64,
@@ -222,9 +215,8 @@ pub fn issue_burn_tx<T: ?Sized, C, L, K>(
 	parent_key_id: &Identifier,
 ) -> Result<Transaction, Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	// TODO

wallet/src/libwallet/internal/updater.rs

@@ -28,23 +28,22 @@ use libwallet;
 use libwallet::error::{Error, ErrorKind};
 use libwallet::internal::keys;
 use libwallet::types::{
-	BlockFees, CbData, OutputData, OutputStatus, TxLogEntry, TxLogEntryType, WalletBackend,
+	BlockFees, CbData, NodeClient, OutputData, OutputStatus, TxLogEntry, TxLogEntryType,
-	WalletInfo, WalletToNodeClient, WalletToWalletClient,
+	WalletBackend, WalletInfo,
 };
 use util;
 use util::secp::pedersen;
 
 /// Retrieve all of the outputs (doesn't attempt to update from node)
-pub fn retrieve_outputs<T: ?Sized, C, L, K>(
+pub fn retrieve_outputs<T: ?Sized, C, K>(
 	wallet: &mut T,
 	show_spent: bool,
 	tx_id: Option<u32>,
 	parent_key_id: &Identifier,
 ) -> Result<Vec<(OutputData, pedersen::Commitment)>, Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	// just read the wallet here, no need for a write lock
@@ -79,16 +78,15 @@ where
 }
 
 /// Retrieve all of the transaction entries, or a particular entry
-pub fn retrieve_txs<T: ?Sized, C, L, K>(
+pub fn retrieve_txs<T: ?Sized, C, K>(
 	wallet: &mut T,
 	tx_id: Option<u32>,
 	tx_slate_id: Option<Uuid>,
 	parent_key_id: &Identifier,
 ) -> Result<Vec<TxLogEntry>, Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	// just read the wallet here, no need for a write lock
@@ -117,14 +115,13 @@ where
 }
 /// Refreshes the outputs in a wallet with the latest information
 /// from a node
-pub fn refresh_outputs<T: ?Sized, C, L, K>(
+pub fn refresh_outputs<T: ?Sized, C, K>(
 	wallet: &mut T,
 	parent_key_id: &Identifier,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	let height = wallet.w2n_client().get_chain_height()?;
@@ -134,14 +131,13 @@ 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<T: ?Sized, C, L, K>(
+pub fn map_wallet_outputs<T: ?Sized, C, K>(
 	wallet: &mut T,
 	parent_key_id: &Identifier,
 ) -> Result<HashMap<pedersen::Commitment, Identifier>, Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	let mut wallet_outputs: HashMap<pedersen::Commitment, Identifier> = HashMap::new();
@@ -157,16 +153,15 @@ where
 }
 
 /// Cancel transaction and associated outputs
-pub fn cancel_tx_and_outputs<T: ?Sized, C, L, K>(
+pub fn cancel_tx_and_outputs<T: ?Sized, C, K>(
 	wallet: &mut T,
 	tx: TxLogEntry,
 	outputs: Vec<OutputData>,
 	parent_key_id: &Identifier,
 ) -> Result<(), libwallet::Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	let mut batch = wallet.batch()?;
@@ -194,7 +189,7 @@ where
 }
 
 /// Apply refreshed API output data to the wallet
-pub fn apply_api_outputs<T: ?Sized, C, L, K>(
+pub fn apply_api_outputs<T: ?Sized, C, K>(
 	wallet: &mut T,
 	wallet_outputs: &HashMap<pedersen::Commitment, Identifier>,
 	api_outputs: &HashMap<pedersen::Commitment, (String, u64)>,
@@ -202,9 +197,8 @@ pub fn apply_api_outputs<T: ?Sized, C, L, K>(
 	parent_key_id: &Identifier,
 ) -> Result<(), libwallet::Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	// now for each commit, find the output in the wallet and the corresponding
@@ -275,15 +269,14 @@ 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<T: ?Sized, C, L, K>(
+fn refresh_output_state<T: ?Sized, C, K>(
 	wallet: &mut T,
 	height: u64,
 	parent_key_id: &Identifier,
 ) -> Result<(), Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	debug!("Refreshing wallet outputs");
@@ -302,11 +295,10 @@ where
 	Ok(())
 }
 
-fn clean_old_unconfirmed<T: ?Sized, C, L, K>(wallet: &mut T, height: u64) -> Result<(), Error>
+fn clean_old_unconfirmed<T: ?Sized, C, K>(wallet: &mut T, height: u64) -> Result<(), Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	if height < 500 {
@@ -328,14 +320,13 @@ where
 
 /// Retrieve summary info about the wallet
 /// caller should refresh first if desired
-pub fn retrieve_info<T: ?Sized, C, L, K>(
+pub fn retrieve_info<T: ?Sized, C, K>(
 	wallet: &mut T,
 	parent_key_id: &Identifier,
 ) -> Result<WalletInfo, Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	let current_height = wallet.last_confirmed_height()?;
@@ -373,14 +364,13 @@ where
 }
 
 /// Build a coinbase output and insert into wallet
-pub fn build_coinbase<T: ?Sized, C, L, K>(
+pub fn build_coinbase<T: ?Sized, C, K>(
 	wallet: &mut T,
 	block_fees: &BlockFees,
 ) -> Result<CbData, Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	let (out, kern, block_fees) = receive_coinbase(wallet, block_fees).context(ErrorKind::Node)?;
@@ -403,14 +393,13 @@ where
 
 //TODO: Split up the output creation and the wallet insertion
 /// Build a coinbase output and the corresponding kernel
-pub fn receive_coinbase<T: ?Sized, C, L, K>(
+pub fn receive_coinbase<T: ?Sized, C, K>(
 	wallet: &mut T,
 	block_fees: &BlockFees,
 ) -> Result<(Output, TxKernel, BlockFees), Error>
 where
-	T: WalletBackend<C, L, K>,
+	T: WalletBackend<C, K>,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	let height = block_fees.height;

wallet/src/libwallet/mod.rs

@@ -23,7 +23,6 @@
 #![warn(missing_docs)]
 
 pub mod api;
-pub mod controller;
 mod error;
 pub mod internal;
 pub mod types;

wallet/src/libwallet/types.rs

@@ -38,18 +38,16 @@ use util::secp::key::{PublicKey, SecretKey};
 use util::secp::{self, pedersen, Secp256k1};
 
 /// Combined trait to allow dynamic wallet dispatch
-pub trait WalletInst<C, L, K>: WalletBackend<C, L, K> + Send + Sync + 'static
+pub trait WalletInst<C, K>: WalletBackend<C, K> + Send + Sync + 'static
 where
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 }
-impl<T, C, L, K> WalletInst<C, L, K> for T
+impl<T, C, K> WalletInst<C, K> for T
 where
-	T: WalletBackend<C, L, K> + Send + Sync + 'static,
+	T: WalletBackend<C, K> + Send + Sync + 'static,
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {}
 
@@ -57,10 +55,9 @@ where
 /// 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<C, L, K>
+pub trait WalletBackend<C, K>
 where
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	/// Initialize with whatever stored credentials we have
@@ -75,9 +72,6 @@ where
 	/// Return the client being used to communicate with the node
 	fn w2n_client(&mut self) -> &mut C;
 
-	/// Return the client being used to communicate with other wallets
-	fn w2w_client(&mut self) -> &mut L;
-
 	/// Set parent key id by stored account name
 	fn set_parent_key_id_by_name(&mut self, label: &str) -> Result<(), Error>;
 
@@ -189,7 +183,7 @@ where
 
 /// Encapsulate all wallet-node communication functions. No functions within libwallet
 /// should care about communication details
-pub trait WalletToNodeClient: Sync + Send + Clone {
+pub trait NodeClient: Sync + Send + Clone {
 	/// Return the URL of the check node
 	fn node_url(&self) -> &str;
 
@@ -228,16 +222,6 @@ pub trait WalletToNodeClient: Sync + Send + Clone {
 	>;
 }
 
-/// Encapsulate wallet to wallet communication functions
-pub trait WalletToWalletClient: Sync + Send + Clone {
-	/// Call the wallet API to create a coinbase transaction
-	fn create_coinbase(&self, dest: &str, block_fees: &BlockFees) -> Result<CbData, Error>;
-
-	/// Send a transaction slate to another listening wallet and return result
-	/// TODO: Probably need a slate wrapper type
-	fn send_tx_slate(&self, addr: &str, slate: &Slate) -> Result<Slate, Error>;
-}
-
 /// Information about an output that's being tracked by the wallet. Must be
 /// enough to reconstruct the commitment associated with the ouput when the
 /// root private key is known.

wallet/src/lmdb_wallet.rs

@@ -51,7 +51,7 @@ pub fn wallet_db_exists(config: WalletConfig) -> bool {
 	db_path.exists()
 }
 
-pub struct LMDBBackend<C, L, K> {
+pub struct LMDBBackend<C, K> {
 	db: store::Store,
 	config: WalletConfig,
 	/// passphrase: TODO better ways of dealing with this other than storing
@@ -62,17 +62,10 @@ pub struct LMDBBackend<C, L, K> {
 	parent_key_id: Identifier,
 	/// wallet to node client
 	w2n_client: C,
-	/// w2w client
-	w2w_client: L,
 }
 
-impl<C, L, K> LMDBBackend<C, L, K> {
+impl<C, K> LMDBBackend<C, K> {
-	pub fn new(
+	pub fn new(config: WalletConfig, passphrase: &str, n_client: C) -> Result<Self, Error> {
-		config: WalletConfig,
-		passphrase: &str,
-		n_client: C,
-		w_client: L,
-	) -> Result<Self, Error> {
 		let db_path = path::Path::new(&config.data_file_dir).join(DB_DIR);
 		fs::create_dir_all(&db_path).expect("Couldn't create wallet backend directory!");
 
@@ -82,7 +75,7 @@ impl<C, L, K> LMDBBackend<C, L, K> {
 		// Make sure default wallet derivation path always exists
 		let default_account = AcctPathMapping {
 			label: "default".to_owned(),
-			path: LMDBBackend::<C, L, K>::default_path(),
+			path: LMDBBackend::<C, K>::default_path(),
 		};
 		let acct_key = to_key(
 			ACCOUNT_PATH_MAPPING_PREFIX,
@@ -100,9 +93,8 @@ impl<C, L, K> LMDBBackend<C, L, K> {
 			config: config.clone(),
 			passphrase: String::from(passphrase),
 			keychain: None,
-			parent_key_id: LMDBBackend::<C, L, K>::default_path(),
+			parent_key_id: LMDBBackend::<C, K>::default_path(),
 			w2n_client: n_client,
-			w2w_client: w_client,
 		};
 		Ok(res)
 	}
@@ -122,10 +114,9 @@ impl<C, L, K> LMDBBackend<C, L, K> {
 	}
 }
 
-impl<C, L, K> WalletBackend<C, L, K> for LMDBBackend<C, L, K>
+impl<C, K> WalletBackend<C, K> for LMDBBackend<C, K>
 where
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	/// Initialise with whatever stored credentials we have
@@ -155,11 +146,6 @@ where
 		&mut self.w2n_client
 	}
 
-	/// Return the wallet to wallet client being used
-	fn w2w_client(&mut self) -> &mut L {
-		&mut self.w2w_client
-	}
-
 	/// Set parent path by account name
 	fn set_parent_key_id_by_name(&mut self, label: &str) -> Result<(), Error> {
 		let label = label.to_owned();
@@ -292,21 +278,21 @@ where
 
 /// An atomic batch in which all changes can be committed all at once or
 /// discarded on error.
-pub struct Batch<'a, C: 'a, L: 'a, K: 'a>
+pub struct Batch<'a, C: 'a, K: 'a>
 where
-	C: WalletToNodeClient,
+	C: NodeClient,
 	K: Keychain,
 {
-	_store: &'a LMDBBackend<C, L, K>,
+	_store: &'a LMDBBackend<C, K>,
 	db: RefCell<Option<store::Batch<'a>>>,
 	/// Keychain
 	keychain: Option<K>,
 }
 
 #[allow(missing_docs)]
-impl<'a, C, L, K> WalletOutputBatch<K> for Batch<'a, C, L, K>
+impl<'a, C, K> WalletOutputBatch<K> for Batch<'a, C, K>
 where
-	C: WalletToNodeClient,
+	C: NodeClient,
 	K: Keychain,
 {
 	fn keychain(&mut self) -> &mut K {
@@ -460,6 +446,8 @@ where
 		self.save(out.clone())
 	}
 
+	//TODO: Keys stored unencrypted in DB.. not good
+	// should store keys as derivation paths instead
 	fn save_private_context(&mut self, slate_id: &[u8], ctx: &Context) -> Result<(), Error> {
 		let ctx_key = to_key(PRIVATE_TX_CONTEXT_PREFIX, &mut slate_id.to_vec());
 		self.db.borrow().as_ref().unwrap().put_ser(&ctx_key, &ctx)?;

wallet/src/node_clients/http.rs

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//! Client functions, implementations of the WalletToNodeClient trait
+//! Client functions, implementations of the NodeClient trait
 //! specific to the FileWallet
 
 use failure::ResultExt;
@@ -24,28 +24,27 @@ use tokio::runtime::Runtime;
 
 use api;
 use error::{Error, ErrorKind};
-use libtx::slate::Slate;
 use libwallet;
 use util;
 use util::secp::pedersen;
 
 #[derive(Clone)]
-pub struct HTTPWalletToNodeClient {
+pub struct HTTPNodeClient {
 	node_url: String,
 	node_api_secret: Option<String>,
 }
 
-impl HTTPWalletToNodeClient {
+impl HTTPNodeClient {
 	/// Create a new client that will communicate with the given grin node
-	pub fn new(node_url: &str, node_api_secret: Option<String>) -> HTTPWalletToNodeClient {
+	pub fn new(node_url: &str, node_api_secret: Option<String>) -> HTTPNodeClient {
-		HTTPWalletToNodeClient {
+		HTTPNodeClient {
 			node_url: node_url.to_owned(),
 			node_api_secret: node_api_secret,
 		}
 	}
 }
 
-impl WalletToNodeClient for HTTPWalletToNodeClient {
+impl NodeClient for HTTPNodeClient {
 	fn node_url(&self) -> &str {
 		&self.node_url
 	}
@@ -176,62 +175,6 @@ impl WalletToNodeClient for HTTPWalletToNodeClient {
 	}
 }
 
-#[derive(Clone)]
-pub struct HTTPWalletToWalletClient {}
-
-impl HTTPWalletToWalletClient {
-	/// Create a new client that will communicate other wallets
-	pub fn new() -> HTTPWalletToWalletClient {
-		HTTPWalletToWalletClient {}
-	}
-}
-
-impl WalletToWalletClient for HTTPWalletToWalletClient {
-	/// Call the wallet API to create a coinbase output for the given
-	/// block_fees. Will retry based on default "retry forever with backoff"
-	/// behavior.
-	fn create_coinbase(
-		&self,
-		dest: &str,
-		block_fees: &BlockFees,
-	) -> Result<CbData, libwallet::Error> {
-		let url = format!("{}/v1/wallet/foreign/build_coinbase", dest);
-		match single_create_coinbase(&url, &block_fees) {
-			Err(e) => {
-				error!(
-					"Failed to get coinbase from {}. Run grin wallet listen?",
-					url
-				);
-				error!("Underlying Error: {}", e.cause().unwrap());
-				error!("Backtrace: {}", e.backtrace().unwrap());
-				Err(libwallet::ErrorKind::ClientCallback(
-					"Failed to get coinbase",
-				))?
-			}
-			Ok(res) => Ok(res),
-		}
-	}
-
-	/// Send the slate to a listening wallet instance
-	fn send_tx_slate(&self, dest: &str, slate: &Slate) -> Result<Slate, libwallet::Error> {
-		if &dest[..4] != "http" {
-			let err_str = format!(
-				"dest formatted as {} but send -d expected stdout or http://IP:port",
-				dest
-			);
-			error!("{}", err_str,);
-			Err(libwallet::ErrorKind::Uri)?
-		}
-		let url = format!("{}/v1/wallet/foreign/receive_tx", dest);
-		debug!("Posting transaction slate to {}", url);
-
-		let res = api::client::post(url.as_str(), None, slate).context(
-			libwallet::ErrorKind::ClientCallback("Posting transaction slate"),
-		)?;
-		Ok(res)
-	}
-}
-
 /// Call the wallet API to create a coinbase output for the given block_fees.
 /// Will retry based on default "retry forever with backoff" behavior.
 pub fn create_coinbase(dest: &str, block_fees: &BlockFees) -> Result<CbData, Error> {

wallet/src/node_clients/mod.rs

@@ -0,0 +1,17 @@
+// Copyright 2018 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 http;
+
+pub use self::http::{create_coinbase, HTTPNodeClient};

wallet/tests/accounts.rs

@@ -51,28 +51,19 @@ fn setup(test_dir: &str) {
 fn accounts_test_impl(test_dir: &str) -> Result<(), libwallet::Error> {
 	setup(test_dir);
 	// Create a new proxy to simulate server and wallet responses
-	let mut wallet_proxy: WalletProxy<LocalWalletClient, LocalWalletClient, ExtKeychain> =
+	let mut wallet_proxy: WalletProxy<LocalWalletClient, ExtKeychain> = WalletProxy::new(test_dir);
-		WalletProxy::new(test_dir);
 	let chain = wallet_proxy.chain.clone();
 
 	// Create a new wallet test client, and set its queues to communicate with the
 	// proxy
-	let client = LocalWalletClient::new("wallet1", wallet_proxy.tx.clone());
+	let client1 = LocalWalletClient::new("wallet1", wallet_proxy.tx.clone());
-	let wallet1 = common::create_wallet(
+	let wallet1 = common::create_wallet(&format!("{}/wallet1", test_dir), client1.clone());
-		&format!("{}/wallet1", test_dir),
+	wallet_proxy.add_wallet("wallet1", client1.get_send_instance(), wallet1.clone());
-		client.clone(),
-		client.clone(),
-	);
-	wallet_proxy.add_wallet("wallet1", client.get_send_instance(), wallet1.clone());
 
+	let client2 = LocalWalletClient::new("wallet2", wallet_proxy.tx.clone());
 	// define recipient wallet, add to proxy
-	let wallet2 = common::create_wallet(
+	let wallet2 = common::create_wallet(&format!("{}/wallet2", test_dir), client2.clone());
-		&format!("{}/wallet2", test_dir),
+	wallet_proxy.add_wallet("wallet2", client2.get_send_instance(), wallet2.clone());
-		client.clone(),
-		client.clone(),
-	);
-	let client = LocalWalletClient::new("wallet2", wallet_proxy.tx.clone());
-	wallet_proxy.add_wallet("wallet2", client.get_send_instance(), wallet2.clone());
 
 	// Set the wallet proxy listener running
 	thread::spawn(move || {
@@ -193,14 +184,16 @@ fn accounts_test_impl(test_dir: &str) -> Result<(), libwallet::Error> {
 	}
 
 	wallet::controller::owner_single_use(wallet1.clone(), |api| {
-		let slate = api.issue_send_tx(
+		let (mut slate, lock_fn) = api.initiate_tx(
-			reward,    // amount
+			None, reward, // amount
 			2,      // minimum confirmations
-			"wallet2", // dest
 			500,    // max outputs
 			1,      // num change outputs
 			true,   // select all outputs
 		)?;
+		slate = client1.send_tx_slate_direct("wallet2", &slate)?;
+		api.finalize_tx(&mut slate)?;
+		api.tx_lock_outputs(&slate, lock_fn)?;
 		api.post_tx(&slate, false)?;
 		Ok(())
 	})?;

wallet/tests/common/mod.rs

@@ -28,11 +28,9 @@ use util::Mutex;
 use chain::Chain;
 use core::core::{OutputFeatures, OutputIdentifier, Transaction};
 use core::{consensus, global, pow, ser};
-use wallet::libwallet;
+use wallet::libwallet::types::{BlockFees, CbData, NodeClient, WalletInst};
-use wallet::libwallet::types::{
-	BlockFees, CbData, WalletInst, WalletToNodeClient, WalletToWalletClient,
-};
 use wallet::lmdb_wallet::LMDBBackend;
+use wallet::{controller, libwallet};
 use wallet::{WalletBackend, WalletConfig};
 
 use util;
@@ -115,14 +113,13 @@ pub fn add_block_with_reward(chain: &Chain, txs: Vec<&Transaction>, reward: CbDa
 /// adds a reward output to a wallet, includes that reward in a block, mines
 /// the block and adds it to the chain, with option transactions included.
 /// Helpful for building up precise wallet balances for testing.
-pub fn award_block_to_wallet<C, L, K>(
+pub fn award_block_to_wallet<C, K>(
 	chain: &Chain,
 	txs: Vec<&Transaction>,
-	wallet: Arc<Mutex<WalletInst<C, L, K>>>,
+	wallet: Arc<Mutex<WalletInst<C, K>>>,
 ) -> Result<(), libwallet::Error>
 where
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: keychain::Keychain,
 {
 	// build block fees
@@ -134,7 +131,7 @@ where
 		height: prev.height + 1,
 	};
 	// build coinbase (via api) and add block
-	libwallet::controller::foreign_single_use(wallet.clone(), |api| {
+	controller::foreign_single_use(wallet.clone(), |api| {
 		let coinbase_tx = api.build_coinbase(&block_fees)?;
 		add_block_with_reward(chain, txs, coinbase_tx.clone());
 		Ok(())
@@ -143,14 +140,13 @@ where
 }
 
 /// Award a blocks to a wallet directly
-pub fn award_blocks_to_wallet<C, L, K>(
+pub fn award_blocks_to_wallet<C, K>(
 	chain: &Chain,
-	wallet: Arc<Mutex<WalletInst<C, L, K>>>,
+	wallet: Arc<Mutex<WalletInst<C, K>>>,
 	number: usize,
 ) -> Result<(), libwallet::Error>
 where
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: keychain::Keychain,
 {
 	for _ in 0..number {
@@ -160,20 +156,15 @@ where
 }
 
 /// dispatch a db wallet
-pub fn create_wallet<C, L, K>(
+pub fn create_wallet<C, K>(dir: &str, n_client: C) -> Arc<Mutex<WalletInst<C, K>>>
-	dir: &str,
-	n_client: C,
-	w_client: L,
-) -> Arc<Mutex<WalletInst<C, L, K>>>
 where
-	C: WalletToNodeClient + 'static,
+	C: NodeClient + 'static,
-	L: WalletToWalletClient + 'static,
 	K: keychain::Keychain + 'static,
 {
 	let mut wallet_config = WalletConfig::default();
 	wallet_config.data_file_dir = String::from(dir);
 	let _ = wallet::WalletSeed::init_file(&wallet_config);
-	let mut wallet = LMDBBackend::new(wallet_config.clone(), "", n_client, w_client)
+	let mut wallet = LMDBBackend::new(wallet_config.clone(), "", n_client)
 		.unwrap_or_else(|e| panic!("Error creating wallet: {:?} Config: {:?}", e, wallet_config));
 	wallet.open_with_credentials().unwrap_or_else(|e| {
 		panic!(

wallet/tests/common/testclient.rs

@@ -43,8 +43,8 @@ use keychain::Keychain;
 
 use util::secp::pedersen;
 use wallet::libtx::slate::Slate;
-use wallet::libwallet;
 use wallet::libwallet::types::*;
+use wallet::{controller, libwallet, WalletCommAdapter, WalletConfig};
 
 use common;
 
@@ -63,10 +63,9 @@ pub struct WalletProxyMessage {
 
 /// communicates with a chain instance or other wallet
 /// listener APIs via message queues
-pub struct WalletProxy<C, L, K>
+pub struct WalletProxy<C, K>
 where
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	/// directory to create the chain in
@@ -78,7 +77,7 @@ where
 		String,
 		(
 			Sender<WalletProxyMessage>,
-			Arc<Mutex<WalletInst<LocalWalletClient, LocalWalletClient, K>>>,
+			Arc<Mutex<WalletInst<LocalWalletClient, K>>>,
 		),
 	>,
 	/// simulate json send to another client
@@ -92,14 +91,11 @@ where
 	phantom_c: PhantomData<C>,
 	/// Phantom
 	phantom_k: PhantomData<K>,
-	/// Phantom
-	phantom_l: PhantomData<L>,
 }
 
-impl<C, L, K> WalletProxy<C, L, K>
+impl<C, K> WalletProxy<C, K>
 where
-	C: WalletToNodeClient,
+	C: NodeClient,
-	L: WalletToWalletClient,
 	K: Keychain,
 {
 	/// Create a new client that will communicate with the given grin node
@@ -128,7 +124,6 @@ where
 			running: Arc::new(AtomicBool::new(false)),
 			phantom_c: PhantomData,
 			phantom_k: PhantomData,
-			phantom_l: PhantomData,
 		};
 		retval
 	}
@@ -138,7 +133,7 @@ where
 		&mut self,
 		addr: &str,
 		tx: Sender<WalletProxyMessage>,
-		wallet: Arc<Mutex<WalletInst<LocalWalletClient, LocalWalletClient, K>>>,
+		wallet: Arc<Mutex<WalletInst<LocalWalletClient, K>>>,
 	) {
 		self.wallets.insert(addr.to_owned(), (tx, wallet));
 	}
@@ -215,8 +210,8 @@ where
 		}
 		let w = dest_wallet.unwrap().1.clone();
 		let mut slate = serde_json::from_str(&m.body).unwrap();
-		libwallet::controller::foreign_single_use(w.clone(), |listener_api| {
+		controller::foreign_single_use(w.clone(), |listener_api| {
-			listener_api.receive_tx(&mut slate)?;
+			listener_api.receive_tx(&mut slate, None)?;
 			Ok(())
 		})?;
 		Ok(WalletProxyMessage {
@@ -314,22 +309,13 @@ impl LocalWalletClient {
 	pub fn get_send_instance(&self) -> Sender<WalletProxyMessage> {
 		self.tx.lock().clone()
 	}
-}
-
-impl WalletToWalletClient for LocalWalletClient {
-	/// Call the wallet API to create a coinbase output for the given
-	/// block_fees. Will retry based on default "retry forever with backoff"
-	/// behavior.
-	fn create_coinbase(
-		&self,
-		_dest: &str,
-		_block_fees: &BlockFees,
-	) -> Result<CbData, libwallet::Error> {
-		unimplemented!();
-	}
 
 	/// Send the slate to a listening wallet instance
-	fn send_tx_slate(&self, dest: &str, slate: &Slate) -> Result<Slate, libwallet::Error> {
+	pub fn send_tx_slate_direct(
+		&self,
+		dest: &str,
+		slate: &Slate,
+	) -> Result<Slate, libwallet::Error> {
 		let m = WalletProxyMessage {
 			sender_id: self.id.clone(),
 			dest: dest.to_owned(),
@@ -352,7 +338,55 @@ impl WalletToWalletClient for LocalWalletClient {
 	}
 }
 
-impl WalletToNodeClient for LocalWalletClient {
+impl WalletCommAdapter for LocalWalletClient {
+	fn supports_sync(&self) -> bool {
+		true
+	}
+
+	/// Send the slate to a listening wallet instance
+	fn send_tx_sync(&self, dest: &str, slate: &Slate) -> Result<Slate, libwallet::Error> {
+		let m = WalletProxyMessage {
+			sender_id: self.id.clone(),
+			dest: dest.to_owned(),
+			method: "send_tx_slate".to_owned(),
+			body: serde_json::to_string(slate).unwrap(),
+		};
+		{
+			let p = self.proxy_tx.lock();
+			p.send(m)
+				.context(libwallet::ErrorKind::ClientCallback("Send TX Slate"))?;
+		}
+		let r = self.rx.lock();
+		let m = r.recv().unwrap();
+		trace!("Received send_tx_slate response: {:?}", m.clone());
+		Ok(
+			serde_json::from_str(&m.body).context(libwallet::ErrorKind::ClientCallback(
+				"Parsing send_tx_slate response",
+			))?,
+		)
+	}
+
+	fn send_tx_async(&self, _dest: &str, _slate: &Slate) -> Result<(), libwallet::Error> {
+		unimplemented!();
+	}
+
+	fn receive_tx_async(&self, _params: &str) -> Result<Slate, libwallet::Error> {
+		unimplemented!();
+	}
+
+	fn listen(
+		&self,
+		params: HashMap<String, String>,
+		config: WalletConfig,
+		passphrase: &str,
+		account: &str,
+		node_api_secret: Option<String>,
+	) -> Result<(), libwallet::Error> {
+		unimplemented!();
+	}
+}
+
+impl NodeClient for LocalWalletClient {
 	fn node_url(&self) -> &str {
 		"node"
 	}

wallet/tests/file.rs

@@ -0,0 +1,181 @@
+// Copyright 2018 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.
+
+//! Test a wallet file send/recieve
+extern crate grin_chain as chain;
+extern crate grin_core as core;
+extern crate grin_keychain as keychain;
+extern crate grin_store as store;
+extern crate grin_util as util;
+extern crate grin_wallet as wallet;
+extern crate rand;
+#[macro_use]
+extern crate log;
+extern crate chrono;
+extern crate serde;
+extern crate uuid;
+
+mod common;
+use common::testclient::{LocalWalletClient, WalletProxy};
+
+use std::fs;
+use std::thread;
+use std::time::Duration;
+
+use core::global;
+use core::global::ChainTypes;
+use keychain::ExtKeychain;
+use wallet::{libwallet, FileWalletCommAdapter};
+
+fn clean_output_dir(test_dir: &str) {
+	let _ = fs::remove_dir_all(test_dir);
+}
+
+fn setup(test_dir: &str) {
+	util::init_test_logger();
+	clean_output_dir(test_dir);
+	global::set_mining_mode(ChainTypes::AutomatedTesting);
+}
+
+/// self send impl
+fn file_exchange_test_impl(test_dir: &str) -> Result<(), libwallet::Error> {
+	setup(test_dir);
+	// Create a new proxy to simulate server and wallet responses
+	let mut wallet_proxy: WalletProxy<LocalWalletClient, ExtKeychain> = WalletProxy::new(test_dir);
+	let chain = wallet_proxy.chain.clone();
+
+	let client1 = LocalWalletClient::new("wallet1", wallet_proxy.tx.clone());
+	let wallet1 = common::create_wallet(&format!("{}/wallet1", test_dir), client1.clone());
+	wallet_proxy.add_wallet("wallet1", client1.get_send_instance(), wallet1.clone());
+
+	let client2 = LocalWalletClient::new("wallet2", wallet_proxy.tx.clone());
+	let wallet2 = common::create_wallet(&format!("{}/wallet2", test_dir), client2.clone());
+	wallet_proxy.add_wallet("wallet2", client2.get_send_instance(), wallet2.clone());
+
+	// Set the wallet proxy listener running
+	thread::spawn(move || {
+		if let Err(e) = wallet_proxy.run() {
+			error!("Wallet Proxy error: {}", e);
+		}
+	});
+
+	// few values to keep things shorter
+	let reward = core::consensus::REWARD;
+
+	// add some accounts
+	wallet::controller::owner_single_use(wallet1.clone(), |api| {
+		api.new_account_path("mining")?;
+		api.new_account_path("listener")?;
+		Ok(())
+	})?;
+
+	// add some accounts
+	wallet::controller::owner_single_use(wallet2.clone(), |api| {
+		api.new_account_path("account1")?;
+		api.new_account_path("account2")?;
+		Ok(())
+	})?;
+
+	// Get some mining done
+	{
+		let mut w = wallet1.lock();
+		w.set_parent_key_id_by_name("mining")?;
+	}
+	let mut bh = 10u64;
+	let _ = common::award_blocks_to_wallet(&chain, wallet1.clone(), bh as usize);
+
+	let send_file = format!("{}/part_tx_1.tx", test_dir);
+	let receive_file = format!("{}/part_tx_2.tx", test_dir);
+
+	// Should have 5 in account1 (5 spendable), 5 in account (2 spendable)
+	wallet::controller::owner_single_use(wallet1.clone(), |api| {
+		let (wallet1_refreshed, wallet1_info) = api.retrieve_summary_info(true)?;
+		assert!(wallet1_refreshed);
+		assert_eq!(wallet1_info.last_confirmed_height, bh);
+		assert_eq!(wallet1_info.total, bh * reward);
+		// send to send
+		let (mut slate, lock_fn) = api.initiate_tx(
+			Some("mining"),
+			reward * 2, // amount
+			2,          // minimum confirmations
+			500,        // max outputs
+			1,          // num change outputs
+			true,       // select all outputs
+			            //"mining",
+			            //"listener",
+		)?;
+		/// output tx file
+		let file_adapter = FileWalletCommAdapter::new();
+		file_adapter.send_tx_async(&send_file, &mut slate)?;
+		api.tx_lock_outputs(&slate, lock_fn)?;
+		Ok(())
+	})?;
+
+	// Get some mining done
+	{
+		let mut w = wallet2.lock();
+		w.set_parent_key_id_by_name("account1")?;
+	}
+
+	// wallet 2 receives file, completes, sends file back
+	wallet::controller::foreign_single_use(wallet2.clone(), |api| {
+		let adapter = FileWalletCommAdapter::new();
+		let mut slate = adapter.receive_tx_async(&send_file)?;
+		api.receive_tx(&mut slate, None)?;
+		adapter.send_tx_async(&receive_file, &mut slate)?;
+		Ok(())
+	})?;
+
+	// wallet 1 finalises and posts
+	wallet::controller::owner_single_use(wallet1.clone(), |api| {
+		let adapter = FileWalletCommAdapter::new();
+		let mut slate = adapter.receive_tx_async(&receive_file)?;
+		api.finalize_tx(&mut slate)?;
+		api.post_tx(&slate, false);
+		bh += 1;
+		Ok(())
+	})?;
+
+	let _ = common::award_blocks_to_wallet(&chain, wallet1.clone(), 3);
+	bh += 3;
+
+	// Check total in mining account
+	wallet::controller::owner_single_use(wallet1.clone(), |api| {
+		let (wallet1_refreshed, wallet1_info) = api.retrieve_summary_info(true)?;
+		assert!(wallet1_refreshed);
+		assert_eq!(wallet1_info.last_confirmed_height, bh);
+		assert_eq!(wallet1_info.total, bh * reward - reward * 2);
+		Ok(())
+	})?;
+
+	// Check total in 'wallet 2' account
+	wallet::controller::owner_single_use(wallet2.clone(), |api| {
+		let (wallet2_refreshed, wallet2_info) = api.retrieve_summary_info(true)?;
+		assert!(wallet2_refreshed);
+		assert_eq!(wallet2_info.last_confirmed_height, bh);
+		assert_eq!(wallet2_info.total, 2 * reward);
+		Ok(())
+	})?;
+
+	// let logging finish
+	thread::sleep(Duration::from_millis(200));
+	Ok(())
+}
+
+#[test]
+fn wallet_file_exchange() {
+	let test_dir = "test_output/file_exchange";
+	if let Err(e) = file_exchange_test_impl(test_dir) {
+		panic!("Libwallet Error: {} - {}", e, e.backtrace().unwrap());
+	}
+}

wallet/tests/restore.rs

@@ -56,11 +56,10 @@ fn restore_wallet(base_dir: &str, wallet_dir: &str) -> Result<(), libwallet::Err
 	let dest_seed = format!("{}/wallet.seed", dest_dir);
 	fs::copy(source_seed, dest_seed)?;
 
-	let mut wallet_proxy: WalletProxy<LocalWalletClient, LocalWalletClient, ExtKeychain> =
+	let mut wallet_proxy: WalletProxy<LocalWalletClient, ExtKeychain> = WalletProxy::new(base_dir);
-		WalletProxy::new(base_dir);
 	let client = LocalWalletClient::new(wallet_dir, wallet_proxy.tx.clone());
 
-	let wallet = common::create_wallet(&dest_dir, client.clone(), client.clone());
+	let wallet = common::create_wallet(&dest_dir, client.clone());
 
 	wallet_proxy.add_wallet(wallet_dir, client.get_send_instance(), wallet.clone());
 
@@ -90,11 +89,10 @@ fn compare_wallet_restore(
 	let source_dir = format!("{}/{}", base_dir, wallet_dir);
 	let dest_dir = format!("{}/{}", base_dir, restore_name);
 
-	let mut wallet_proxy: WalletProxy<LocalWalletClient, LocalWalletClient, ExtKeychain> =
+	let mut wallet_proxy: WalletProxy<LocalWalletClient, ExtKeychain> = WalletProxy::new(base_dir);
-		WalletProxy::new(base_dir);
 
 	let client = LocalWalletClient::new(wallet_dir, wallet_proxy.tx.clone());
-	let wallet_source = common::create_wallet(&source_dir, client.clone(), client.clone());
+	let wallet_source = common::create_wallet(&source_dir, client.clone());
 	wallet_proxy.add_wallet(
 		&wallet_dir,
 		client.get_send_instance(),
@@ -102,7 +100,7 @@ fn compare_wallet_restore(
 	);
 
 	let client = LocalWalletClient::new(&restore_name, wallet_proxy.tx.clone());
-	let wallet_dest = common::create_wallet(&dest_dir, client.clone(), client.clone());
+	let wallet_dest = common::create_wallet(&dest_dir, client.clone());
 	wallet_proxy.add_wallet(
 		&restore_name,
 		client.get_send_instance(),
@@ -184,28 +182,19 @@ fn compare_wallet_restore(
 fn setup_restore(test_dir: &str) -> Result<(), libwallet::Error> {
 	setup(test_dir);
 	// Create a new proxy to simulate server and wallet responses
-	let mut wallet_proxy: WalletProxy<LocalWalletClient, LocalWalletClient, ExtKeychain> =
+	let mut wallet_proxy: WalletProxy<LocalWalletClient, ExtKeychain> = WalletProxy::new(test_dir);
-		WalletProxy::new(test_dir);
 	let chain = wallet_proxy.chain.clone();
 
 	// Create a new wallet test client, and set its queues to communicate with the
 	// proxy
-	let client = LocalWalletClient::new("wallet1", wallet_proxy.tx.clone());
+	let client1 = LocalWalletClient::new("wallet1", wallet_proxy.tx.clone());
-	let wallet1 = common::create_wallet(
+	let wallet1 = common::create_wallet(&format!("{}/wallet1", test_dir), client1.clone());
-		&format!("{}/wallet1", test_dir),
+	wallet_proxy.add_wallet("wallet1", client1.get_send_instance(), wallet1.clone());
-		client.clone(),
-		client.clone(),
-	);
-	wallet_proxy.add_wallet("wallet1", client.get_send_instance(), wallet1.clone());
 
 	// define recipient wallet, add to proxy
-	let client = LocalWalletClient::new("wallet2", wallet_proxy.tx.clone());
+	let client2 = LocalWalletClient::new("wallet2", wallet_proxy.tx.clone());
-	let wallet2 = common::create_wallet(
+	let wallet2 = common::create_wallet(&format!("{}/wallet2", test_dir), client2.clone());
-		&format!("{}/wallet2", test_dir),
+	wallet_proxy.add_wallet("wallet2", client2.get_send_instance(), wallet2.clone());
-		client.clone(),
-		client.clone(),
-	);
-	wallet_proxy.add_wallet("wallet2", client.get_send_instance(), wallet2.clone());
 
 	// wallet 2 will use another account
 	wallet::controller::owner_single_use(wallet2.clone(), |api| {
@@ -221,13 +210,9 @@ fn setup_restore(test_dir: &str) -> Result<(), libwallet::Error> {
 	}
 
 	// Another wallet
-	let client = LocalWalletClient::new("wallet3", wallet_proxy.tx.clone());
+	let client3 = LocalWalletClient::new("wallet3", wallet_proxy.tx.clone());
-	let wallet3 = common::create_wallet(
+	let wallet3 = common::create_wallet(&format!("{}/wallet3", test_dir), client3.clone());
-		&format!("{}/wallet3", test_dir),
+	wallet_proxy.add_wallet("wallet3", client3.get_send_instance(), wallet3.clone());
-		client.clone(),
-		client.clone(),
-	);
-	wallet_proxy.add_wallet("wallet3", client.get_send_instance(), wallet3.clone());
 
 	// Set the wallet proxy listener running
 	thread::spawn(move || {
@@ -245,14 +230,16 @@ fn setup_restore(test_dir: &str) -> Result<(), libwallet::Error> {
 	let mut slate = Slate::blank(1);
 	wallet::controller::owner_single_use(wallet1.clone(), |sender_api| {
 		// note this will increment the block count as part of the transaction "Posting"
-		slate = sender_api.issue_send_tx(
+		let (slate_i, lock_fn) = sender_api.initiate_tx(
-			amount,    // amount
+			None, amount, // amount
 			2,      // minimum confirmations
-			"wallet2", // dest
 			500,    // max outputs
 			1,      // num change outputs
 			true,   // select all outputs
 		)?;
+		slate = client1.send_tx_slate_direct("wallet2", &slate_i)?;
+		sender_api.finalize_tx(&mut slate)?;
+		sender_api.tx_lock_outputs(&slate, lock_fn)?;
 		sender_api.post_tx(&slate, false)?;
 		Ok(())
 	})?;
@@ -263,14 +250,17 @@ fn setup_restore(test_dir: &str) -> Result<(), libwallet::Error> {
 	// Send some to wallet 3
 	wallet::controller::owner_single_use(wallet1.clone(), |sender_api| {
 		// note this will increment the block count as part of the transaction "Posting"
-		slate = sender_api.issue_send_tx(
+		let (slate_i, lock_fn) = sender_api.initiate_tx(
+			None,
 			amount * 2, // amount
 			2,          // minimum confirmations
-			"wallet3",  // dest
 			500,        // max outputs
 			1,          // num change outputs
 			true,       // select all outputs
 		)?;
+		slate = client1.send_tx_slate_direct("wallet3", &slate_i)?;
+		sender_api.finalize_tx(&mut slate)?;
+		sender_api.tx_lock_outputs(&slate, lock_fn)?;
 		sender_api.post_tx(&slate, false)?;
 		Ok(())
 	})?;
@@ -281,14 +271,17 @@ fn setup_restore(test_dir: &str) -> Result<(), libwallet::Error> {
 	// Wallet3 to wallet 2
 	wallet::controller::owner_single_use(wallet3.clone(), |sender_api| {
 		// note this will increment the block count as part of the transaction "Posting"
-		slate = sender_api.issue_send_tx(
+		let (slate_i, lock_fn) = sender_api.initiate_tx(
+			None,
 			amount * 3, // amount
 			2,          // minimum confirmations
-			"wallet2",  // dest
 			500,        // max outputs
 			1,          // num change outputs
 			true,       // select all outputs
 		)?;
+		slate = client3.send_tx_slate_direct("wallet2", &slate_i)?;
+		sender_api.finalize_tx(&mut slate)?;
+		sender_api.tx_lock_outputs(&slate, lock_fn)?;
 		sender_api.post_tx(&slate, false)?;
 		Ok(())
 	})?;
@@ -305,14 +298,17 @@ fn setup_restore(test_dir: &str) -> Result<(), libwallet::Error> {
 	// Wallet3 to wallet 2 again (to another account)
 	wallet::controller::owner_single_use(wallet3.clone(), |sender_api| {
 		// note this will increment the block count as part of the transaction "Posting"
-		slate = sender_api.issue_send_tx(
+		let (slate_i, lock_fn) = sender_api.initiate_tx(
+			None,
 			amount * 3, // amount
 			2,          // minimum confirmations
-			"wallet2",  // dest
 			500,        // max outputs
 			1,          // num change outputs
 			true,       // select all outputs
 		)?;
+		slate = client3.send_tx_slate_direct("wallet2", &slate_i)?;
+		sender_api.finalize_tx(&mut slate)?;
+		sender_api.tx_lock_outputs(&slate, lock_fn)?;
 		sender_api.post_tx(&slate, false)?;
 		Ok(())
 	})?;

wallet/tests/self_send.rs

@@ -51,28 +51,14 @@ fn setup(test_dir: &str) {
 fn self_send_test_impl(test_dir: &str) -> Result<(), libwallet::Error> {
 	setup(test_dir);
 	// Create a new proxy to simulate server and wallet responses
-	let mut wallet_proxy: WalletProxy<LocalWalletClient, LocalWalletClient, ExtKeychain> =
+	let mut wallet_proxy: WalletProxy<LocalWalletClient, ExtKeychain> = WalletProxy::new(test_dir);
-		WalletProxy::new(test_dir);
 	let chain = wallet_proxy.chain.clone();
 
 	// Create a new wallet test client, and set its queues to communicate with the
 	// proxy
-	let client = LocalWalletClient::new("wallet1", wallet_proxy.tx.clone());
+	let client1 = LocalWalletClient::new("wallet1", wallet_proxy.tx.clone());
-	let wallet1 = common::create_wallet(
+	let wallet1 = common::create_wallet(&format!("{}/wallet1", test_dir), client1.clone());
-		&format!("{}/wallet1", test_dir),
+	wallet_proxy.add_wallet("wallet1", client1.get_send_instance(), wallet1.clone());
-		client.clone(),
-		client.clone(),
-	);
-	wallet_proxy.add_wallet("wallet1", client.get_send_instance(), wallet1.clone());
-
-	// define recipient wallet, add to proxy
-	let wallet2 = common::create_wallet(
-		&format!("{}/wallet2", test_dir),
-		client.clone(),
-		client.clone(),
-	);
-	let client = LocalWalletClient::new("wallet2", wallet_proxy.tx.clone());
-	wallet_proxy.add_wallet("wallet2", client.get_send_instance(), wallet2.clone());
 
 	// Set the wallet proxy listener running
 	thread::spawn(move || {
@@ -91,18 +77,6 @@ fn self_send_test_impl(test_dir: &str) -> Result<(), libwallet::Error> {
 		Ok(())
 	})?;
 
-	// add account to wallet 2
-	wallet::controller::owner_single_use(wallet2.clone(), |api| {
-		api.new_account_path("listener")?;
-		Ok(())
-	})?;
-
-	// Default wallet 2 to listen on that account
-	{
-		let mut w = wallet2.lock();
-		w.set_parent_key_id_by_name("listener")?;
-	}
-
 	// Get some mining done
 	{
 		let mut w = wallet1.lock();
@@ -118,15 +92,23 @@ fn self_send_test_impl(test_dir: &str) -> Result<(), libwallet::Error> {
 		assert_eq!(wallet1_info.last_confirmed_height, bh);
 		assert_eq!(wallet1_info.total, bh * reward);
 		// send to send
-		let slate = api.issue_self_tx(
+		let (mut slate, lock_fn) = api.initiate_tx(
+			Some("mining"),
 			reward * 2, // amount
 			2,          // minimum confirmations
 			500,        // max outputs
 			1,          // num change outputs
 			true,       // select all outputs
-			"mining",
+			            //"mining",
-			"listener",
+			            //"listener",
 		)?;
+		// Send directly to self
+		wallet::controller::foreign_single_use(wallet1.clone(), |api| {
+			api.receive_tx(&mut slate, Some("listener"))?;
+			Ok(())
+		})?;
+		api.finalize_tx(&mut slate)?;
+		api.tx_lock_outputs(&slate, lock_fn)?;
 		api.post_tx(&slate, false)?; // mines a block
 		bh += 1;
 		Ok(())
@@ -163,7 +145,7 @@ fn self_send_test_impl(test_dir: &str) -> Result<(), libwallet::Error> {
 }
 
 #[test]
-fn wallet_stress() {
+fn wallet_self_send() {
 	let test_dir = "test_output/self_send";
 	if let Err(e) = self_send_test_impl(test_dir) {
 		panic!("Libwallet Error: {} - {}", e, e.backtrace().unwrap());

wallet/tests/transaction.rs

@@ -49,34 +49,25 @@ fn setup(test_dir: &str) {
 	global::set_mining_mode(ChainTypes::AutomatedTesting);
 }
 
-/// Exercises the Transaction API fully with a test WalletToNodeClient operating
+/// Exercises the Transaction API fully with a test NodeClient operating
 /// directly on a chain instance
 /// Callable with any type of wallet
 fn basic_transaction_api(test_dir: &str) -> Result<(), libwallet::Error> {
 	setup(test_dir);
 	// Create a new proxy to simulate server and wallet responses
-	let mut wallet_proxy: WalletProxy<LocalWalletClient, LocalWalletClient, ExtKeychain> =
+	let mut wallet_proxy: WalletProxy<LocalWalletClient, ExtKeychain> = WalletProxy::new(test_dir);
-		WalletProxy::new(test_dir);
 	let chain = wallet_proxy.chain.clone();
 
 	// Create a new wallet test client, and set its queues to communicate with the
 	// proxy
-	let client = LocalWalletClient::new("wallet1", wallet_proxy.tx.clone());
+	let client1 = LocalWalletClient::new("wallet1", wallet_proxy.tx.clone());
-	let wallet1 = common::create_wallet(
+	let wallet1 = common::create_wallet(&format!("{}/wallet1", test_dir), client1.clone());
-		&format!("{}/wallet1", test_dir),
+	wallet_proxy.add_wallet("wallet1", client1.get_send_instance(), wallet1.clone());
-		client.clone(),
-		client.clone(),
-	);
-	wallet_proxy.add_wallet("wallet1", client.get_send_instance(), wallet1.clone());
 
+	let client2 = LocalWalletClient::new("wallet2", wallet_proxy.tx.clone());
 	// define recipient wallet, add to proxy
-	let wallet2 = common::create_wallet(
+	let wallet2 = common::create_wallet(&format!("{}/wallet2", test_dir), client2.clone());
-		&format!("{}/wallet2", test_dir),
+	wallet_proxy.add_wallet("wallet2", client2.get_send_instance(), wallet2.clone());
-		client.clone(),
-		client.clone(),
-	);
-	let client = LocalWalletClient::new("wallet2", wallet_proxy.tx.clone());
-	wallet_proxy.add_wallet("wallet2", client.get_send_instance(), wallet2.clone());
 
 	// Set the wallet proxy listener running
 	thread::spawn(move || {
@@ -113,14 +104,16 @@ fn basic_transaction_api(test_dir: &str) -> Result<(), libwallet::Error> {
 	let mut slate = Slate::blank(1);
 	wallet::controller::owner_single_use(wallet1.clone(), |sender_api| {
 		// note this will increment the block count as part of the transaction "Posting"
-		slate = sender_api.issue_send_tx(
+		let (slate_i, lock_fn) = sender_api.initiate_tx(
-			amount,    // amount
+			None, amount, // amount
 			2,      // minimum confirmations
-			"wallet2", // dest
 			500,    // max outputs
 			1,      // num change outputs
 			true,   // select all outputs
 		)?;
+		slate = client1.send_tx_slate_direct("wallet2", &slate_i)?;
+		sender_api.finalize_tx(&mut slate)?;
+		sender_api.tx_lock_outputs(&slate, lock_fn)?;
 		Ok(())
 	})?;
 
@@ -244,14 +237,17 @@ fn basic_transaction_api(test_dir: &str) -> Result<(), libwallet::Error> {
 	// the stored transaction instead
 	wallet::controller::owner_single_use(wallet1.clone(), |sender_api| {
 		// note this will increment the block count as part of the transaction "Posting"
-		slate = sender_api.issue_send_tx(
+		let (slate_i, lock_fn) = sender_api.initiate_tx(
+			None,
 			amount * 2, // amount
 			2,          // minimum confirmations
-			"wallet2",  // dest
 			500,        // max outputs
 			1,          // num change outputs
 			true,       // select all outputs
 		)?;
+		slate = client1.send_tx_slate_direct("wallet2", &slate_i)?;
+		sender_api.finalize_tx(&mut slate)?;
+		sender_api.tx_lock_outputs(&slate, lock_fn)?;
 		Ok(())
 	})?;
 
@@ -305,28 +301,19 @@ fn basic_transaction_api(test_dir: &str) -> Result<(), libwallet::Error> {
 fn tx_rollback(test_dir: &str) -> Result<(), libwallet::Error> {
 	setup(test_dir);
 	// Create a new proxy to simulate server and wallet responses
-	let mut wallet_proxy: WalletProxy<LocalWalletClient, LocalWalletClient, ExtKeychain> =
+	let mut wallet_proxy: WalletProxy<LocalWalletClient, ExtKeychain> = WalletProxy::new(test_dir);
-		WalletProxy::new(test_dir);
 	let chain = wallet_proxy.chain.clone();
 
 	// Create a new wallet test client, and set its queues to communicate with the
 	// proxy
-	let client = LocalWalletClient::new("wallet1", wallet_proxy.tx.clone());
+	let client1 = LocalWalletClient::new("wallet1", wallet_proxy.tx.clone());
-	let wallet1 = common::create_wallet(
+	let wallet1 = common::create_wallet(&format!("{}/wallet1", test_dir), client1.clone());
-		&format!("{}/wallet1", test_dir),
+	wallet_proxy.add_wallet("wallet1", client1.get_send_instance(), wallet1.clone());
-		client.clone(),
-		client.clone(),
-	);
-	wallet_proxy.add_wallet("wallet1", client.get_send_instance(), wallet1.clone());
 
 	// define recipient wallet, add to proxy
-	let client = LocalWalletClient::new("wallet2", wallet_proxy.tx.clone());
+	let client2 = LocalWalletClient::new("wallet2", wallet_proxy.tx.clone());
-	let wallet2 = common::create_wallet(
+	let wallet2 = common::create_wallet(&format!("{}/wallet2", test_dir), client2.clone());
-		&format!("{}/wallet2", test_dir),
+	wallet_proxy.add_wallet("wallet2", client2.get_send_instance(), wallet2.clone());
-		client.clone(),
-		client.clone(),
-	);
-	wallet_proxy.add_wallet("wallet2", client.get_send_instance(), wallet2.clone());
 
 	// Set the wallet proxy listener running
 	thread::spawn(move || {
@@ -345,14 +332,16 @@ fn tx_rollback(test_dir: &str) -> Result<(), libwallet::Error> {
 	let mut slate = Slate::blank(1);
 	wallet::controller::owner_single_use(wallet1.clone(), |sender_api| {
 		// note this will increment the block count as part of the transaction "Posting"
-		slate = sender_api.issue_send_tx(
+		let (slate_i, lock_fn) = sender_api.initiate_tx(
-			amount,    // amount
+			None, amount, // amount
 			2,      // minimum confirmations
-			"wallet2", // dest
 			500,    // max outputs
 			1,      // num change outputs
 			true,   // select all outputs
 		)?;
+		slate = client1.send_tx_slate_direct("wallet2", &slate_i)?;
+		sender_api.finalize_tx(&mut slate)?;
+		sender_api.tx_lock_outputs(&slate, lock_fn)?;
 		Ok(())
 	})?;