1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
// This file is part of Substrate.

// Copyright (C) 2017-2020 Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

//! Substrate service. Starts a thread that spins up the network, client, and extrinsic pool.
//! Manages communication between them.

#![warn(missing_docs)]
#![recursion_limit = "1024"]

pub mod config;
pub mod chain_ops;
pub mod error;

mod metrics;
mod builder;
#[cfg(feature = "test-helpers")]
pub mod client;
#[cfg(not(feature = "test-helpers"))]
mod client;
mod task_manager;

use std::{io, pin::Pin};
use std::net::SocketAddr;
use std::collections::HashMap;
use std::time::Duration;
use std::task::Poll;
use parking_lot::Mutex;

use futures::{Future, FutureExt, Stream, StreamExt, stream, compat::*};
use sc_network::{NetworkStatus, network_state::NetworkState, PeerId};
use log::{warn, debug, error};
use codec::{Encode, Decode};
use sp_runtime::generic::BlockId;
use sp_runtime::traits::{Block as BlockT, Header as HeaderT};
use parity_util_mem::MallocSizeOf;
use sp_utils::{status_sinks, mpsc::{tracing_unbounded, TracingUnboundedReceiver,  TracingUnboundedSender}};

pub use self::error::Error;
pub use self::builder::{
	new_full_client, new_client, new_full_parts, new_light_parts, build,
	ServiceParams, TFullClient, TLightClient, TFullBackend, TLightBackend,
	TLightBackendWithHash, TLightClientWithBackend,
	TFullCallExecutor, TLightCallExecutor, RpcExtensionBuilder, NoopRpcExtensionBuilder,
};
pub use config::{
	BasePath, Configuration, DatabaseConfig, PruningMode, Role, RpcMethods, TaskExecutor, TaskType,
};
pub use sc_chain_spec::{
	ChainSpec, GenericChainSpec, Properties, RuntimeGenesis, Extension as ChainSpecExtension,
	NoExtension, ChainType,
};
pub use sp_transaction_pool::{TransactionPool, InPoolTransaction, error::IntoPoolError};
pub use sc_transaction_pool::txpool::Options as TransactionPoolOptions;
pub use sc_rpc::Metadata as RpcMetadata;
pub use sc_executor::NativeExecutionDispatch;
#[doc(hidden)]
pub use std::{ops::Deref, result::Result, sync::Arc};
#[doc(hidden)]
pub use sc_network::config::{
	FinalityProofProvider, OnDemand, BoxFinalityProofRequestBuilder, TransactionImport,
	TransactionImportFuture,
};
pub use sc_tracing::TracingReceiver;
pub use task_manager::SpawnTaskHandle;
pub use task_manager::TaskManager;
pub use sp_consensus::import_queue::ImportQueue;
use sc_client_api::{Backend, BlockchainEvents};

const DEFAULT_PROTOCOL_ID: &str = "sup";

/// A type that implements `MallocSizeOf` on native but not wasm.
#[cfg(not(target_os = "unknown"))]
pub trait MallocSizeOfWasm: MallocSizeOf {}
#[cfg(target_os = "unknown")]
pub trait MallocSizeOfWasm {}
#[cfg(not(target_os = "unknown"))]
impl<T: MallocSizeOf> MallocSizeOfWasm for T {}
#[cfg(target_os = "unknown")]
impl<T> MallocSizeOfWasm for T {}

/// RPC handlers that can perform RPC queries.
pub struct RpcHandlers(sc_rpc_server::RpcHandler<sc_rpc::Metadata>);

impl RpcHandlers {
	/// Starts an RPC query.
	///
	/// The query is passed as a string and must be a JSON text similar to what an HTTP client
	/// would for example send.
	///
	/// Returns a `Future` that contains the optional response.
	///
	/// If the request subscribes you to events, the `Sender` in the `RpcSession` object is used to
	/// send back spontaneous events.
	pub fn rpc_query(&self, mem: &RpcSession, request: &str)
		-> Pin<Box<dyn Future<Output = Option<String>> + Send>> {
		self.0.handle_request(request, mem.metadata.clone())
			.compat()
			.map(|res| res.expect("this should never fail"))
			.boxed()
	}
}

/// Sinks to propagate network status updates.
/// For each element, every time the `Interval` fires we push an element on the sender.
pub struct NetworkStatusSinks<Block: BlockT>(
	Arc<status_sinks::StatusSinks<(NetworkStatus<Block>, NetworkState)>>,
);

impl<Block: BlockT> NetworkStatusSinks<Block> {
	fn new(
		sinks: Arc<status_sinks::StatusSinks<(NetworkStatus<Block>, NetworkState)>>
	) -> Self {
		Self(sinks)
	}

	/// Returns a receiver that periodically receives a status of the network.
	pub fn network_status(&self, interval: Duration)
		-> TracingUnboundedReceiver<(NetworkStatus<Block>, NetworkState)> {
		let (sink, stream) = tracing_unbounded("mpsc_network_status");
		self.0.push(interval, sink);
		stream
	}
}

/// Sinks to propagate telemetry connection established events.
pub struct TelemetryOnConnectSinks(pub Arc<Mutex<Vec<TracingUnboundedSender<()>>>>);

impl TelemetryOnConnectSinks {
	/// Get event stream for telemetry connection established events.
	pub fn on_connect_stream(&self) -> TracingUnboundedReceiver<()> {
		let (sink, stream) =tracing_unbounded("mpsc_telemetry_on_connect");
		self.0.lock().push(sink);
		stream
	}
}

/// The individual components of the chain, built by the service builder. You are encouraged to
/// deconstruct this into its fields.
pub struct ServiceComponents<TBl: BlockT, TBackend: Backend<TBl>, TCl> {
	/// The chain task manager.
	pub task_manager: TaskManager,
	/// A shared network instance.
	pub network: Arc<sc_network::NetworkService<TBl, <TBl as BlockT>::Hash>>,
	/// RPC handlers that can perform RPC queries.
	pub rpc_handlers: Arc<RpcHandlers>,
	/// Sinks to propagate network status updates.
	pub network_status_sinks: NetworkStatusSinks<TBl>,
	/// Shared Telemetry connection sinks,
	pub telemetry_on_connect_sinks: TelemetryOnConnectSinks,
	/// A shared offchain workers instance.
	pub offchain_workers: Option<Arc<sc_offchain::OffchainWorkers<
		TCl, TBackend::OffchainStorage, TBl
	>>>,
}

/// Builds a never-ending future that continuously polls the network.
///
/// The `status_sink` contain a list of senders to send a periodic network status to.
async fn build_network_future<
	B: BlockT,
	C: BlockchainEvents<B>,
	H: sc_network::ExHashT
> (
	role: Role,
	mut network: sc_network::NetworkWorker<B, H>,
	client: Arc<C>,
	status_sinks: Arc<status_sinks::StatusSinks<(NetworkStatus<B>, NetworkState)>>,
	mut rpc_rx: TracingUnboundedReceiver<sc_rpc::system::Request<B>>,
	should_have_peers: bool,
	announce_imported_blocks: bool,
) {
	let mut imported_blocks_stream = client.import_notification_stream().fuse();

	// Stream of finalized blocks reported by the client.
	let mut finality_notification_stream = {
		let mut finality_notification_stream = client.finality_notification_stream().fuse();

		// We tweak the `Stream` in order to merge together multiple items if they happen to be
		// ready. This way, we only get the latest finalized block.
		stream::poll_fn(move |cx| {
			let mut last = None;
			while let Poll::Ready(Some(item)) = Pin::new(&mut finality_notification_stream).poll_next(cx) {
				last = Some(item);
			}
			if let Some(last) = last {
				Poll::Ready(Some(last))
			} else {
				Poll::Pending
			}
		}).fuse()
	};

	loop {
		futures::select!{
			// List of blocks that the client has imported.
			notification = imported_blocks_stream.next() => {
				let notification = match notification {
					Some(n) => n,
					// If this stream is shut down, that means the client has shut down, and the
					// most appropriate thing to do for the network future is to shut down too.
					None => return,
				};

				if announce_imported_blocks {
					network.service().announce_block(notification.hash, Vec::new());
				}

				if let sp_consensus::BlockOrigin::Own = notification.origin {
					network.service().own_block_imported(
						notification.hash,
						notification.header.number().clone(),
					);
				}
			}

			// List of blocks that the client has finalized.
			notification = finality_notification_stream.select_next_some() => {
				network.on_block_finalized(notification.hash, notification.header);
			}

			// Answer incoming RPC requests.
			request = rpc_rx.select_next_some() => {
				match request {
					sc_rpc::system::Request::Health(sender) => {
						let _ = sender.send(sc_rpc::system::Health {
							peers: network.peers_debug_info().len(),
							is_syncing: network.service().is_major_syncing(),
							should_have_peers,
						});
					},
					sc_rpc::system::Request::LocalPeerId(sender) => {
						let _ = sender.send(network.local_peer_id().to_base58());
					},
					sc_rpc::system::Request::LocalListenAddresses(sender) => {
						let peer_id = network.local_peer_id().clone().into();
						let p2p_proto_suffix = sc_network::multiaddr::Protocol::P2p(peer_id);
						let addresses = network.listen_addresses()
							.map(|addr| addr.clone().with(p2p_proto_suffix.clone()).to_string())
							.collect();
						let _ = sender.send(addresses);
					},
					sc_rpc::system::Request::Peers(sender) => {
						let _ = sender.send(network.peers_debug_info().into_iter().map(|(peer_id, p)|
							sc_rpc::system::PeerInfo {
								peer_id: peer_id.to_base58(),
								roles: format!("{:?}", p.roles),
								protocol_version: p.protocol_version,
								best_hash: p.best_hash,
								best_number: p.best_number,
							}
						).collect());
					}
					sc_rpc::system::Request::NetworkState(sender) => {
						if let Some(network_state) = serde_json::to_value(&network.network_state()).ok() {
							let _ = sender.send(network_state);
						}
					}
					sc_rpc::system::Request::NetworkAddReservedPeer(peer_addr, sender) => {
						let x = network.add_reserved_peer(peer_addr)
							.map_err(sc_rpc::system::error::Error::MalformattedPeerArg);
						let _ = sender.send(x);
					}
					sc_rpc::system::Request::NetworkRemoveReservedPeer(peer_id, sender) => {
						let _ = match peer_id.parse::<PeerId>() {
							Ok(peer_id) => {
								network.remove_reserved_peer(peer_id);
								sender.send(Ok(()))
							}
							Err(e) => sender.send(Err(sc_rpc::system::error::Error::MalformattedPeerArg(
								e.to_string(),
							))),
						};
					}
					sc_rpc::system::Request::NodeRoles(sender) => {
						use sc_rpc::system::NodeRole;

						let node_role = match role {
							Role::Authority { .. } => NodeRole::Authority,
							Role::Light => NodeRole::LightClient,
							Role::Full => NodeRole::Full,
							Role::Sentry { .. } => NodeRole::Sentry,
						};

						let _ = sender.send(vec![node_role]);
					}
				}
			}

			// The network worker has done something. Nothing special to do, but could be
			// used in the future to perform actions in response of things that happened on
			// the network.
			_ = (&mut network).fuse() => {}

			// At a regular interval, we send the state of the network on what is called
			// the "status sinks".
			ready_sink = status_sinks.next().fuse() => {
				let status = NetworkStatus {
					sync_state: network.sync_state(),
					best_seen_block: network.best_seen_block(),
					num_sync_peers: network.num_sync_peers(),
					num_connected_peers: network.num_connected_peers(),
					num_active_peers: network.num_active_peers(),
					average_download_per_sec: network.average_download_per_sec(),
					average_upload_per_sec: network.average_upload_per_sec(),
				};
				let state = network.network_state();
				ready_sink.send((status, state));
			}
		}
	}
}

#[cfg(not(target_os = "unknown"))]
// Wrapper for HTTP and WS servers that makes sure they are properly shut down.
mod waiting {
	pub struct HttpServer(pub Option<sc_rpc_server::HttpServer>);
	impl Drop for HttpServer {
		fn drop(&mut self) {
			if let Some(server) = self.0.take() {
				server.close_handle().close();
				server.wait();
			}
		}
	}

	pub struct IpcServer(pub Option<sc_rpc_server::IpcServer>);
	impl Drop for IpcServer {
		fn drop(&mut self) {
			if let Some(server) = self.0.take() {
				server.close_handle().close();
				let _ = server.wait();
			}
		}
	}

	pub struct WsServer(pub Option<sc_rpc_server::WsServer>);
	impl Drop for WsServer {
		fn drop(&mut self) {
			if let Some(server) = self.0.take() {
				server.close_handle().close();
				let _ = server.wait();
			}
		}
	}
}

/// Starts RPC servers that run in their own thread, and returns an opaque object that keeps them alive.
#[cfg(not(target_os = "unknown"))]
fn start_rpc_servers<H: FnMut(sc_rpc::DenyUnsafe) -> sc_rpc_server::RpcHandler<sc_rpc::Metadata>>(
	config: &Configuration,
	mut gen_handler: H
) -> Result<Box<dyn std::any::Any + Send + Sync>, error::Error> {
	fn maybe_start_server<T, F>(address: Option<SocketAddr>, mut start: F) -> Result<Option<T>, io::Error>
		where F: FnMut(&SocketAddr) -> Result<T, io::Error>,
	{
		Ok(match address {
			Some(mut address) => Some(start(&address)
				.or_else(|e| match e.kind() {
					io::ErrorKind::AddrInUse |
					io::ErrorKind::PermissionDenied => {
						warn!("Unable to bind RPC server to {}. Trying random port.", address);
						address.set_port(0);
						start(&address)
					},
					_ => Err(e),
				})?),
			None => None,
		})
	}

	fn deny_unsafe(addr: &SocketAddr, methods: &RpcMethods) -> sc_rpc::DenyUnsafe {
		let is_exposed_addr = !addr.ip().is_loopback();
		match (is_exposed_addr, methods) {
			| (_, RpcMethods::Unsafe)
			| (false, RpcMethods::Auto) => sc_rpc::DenyUnsafe::No,
			_ => sc_rpc::DenyUnsafe::Yes
		}
	}

	Ok(Box::new((
		config.rpc_ipc.as_ref().map(|path| sc_rpc_server::start_ipc(&*path, gen_handler(sc_rpc::DenyUnsafe::No))),
		maybe_start_server(
			config.rpc_http,
			|address| sc_rpc_server::start_http(
				address,
				config.rpc_cors.as_ref(),
				gen_handler(deny_unsafe(&address, &config.rpc_methods)),
			),
		)?.map(|s| waiting::HttpServer(Some(s))),
		maybe_start_server(
			config.rpc_ws,
			|address| sc_rpc_server::start_ws(
				address,
				config.rpc_ws_max_connections,
				config.rpc_cors.as_ref(),
				gen_handler(deny_unsafe(&address, &config.rpc_methods)),
			),
		)?.map(|s| waiting::WsServer(Some(s))),
	)))
}

/// Starts RPC servers that run in their own thread, and returns an opaque object that keeps them alive.
#[cfg(target_os = "unknown")]
fn start_rpc_servers<H: FnMut(sc_rpc::DenyUnsafe) -> sc_rpc_server::RpcHandler<sc_rpc::Metadata>>(
	_: &Configuration,
	_: H
) -> Result<Box<dyn std::any::Any + Send + Sync>, error::Error> {
	Ok(Box::new(()))
}

/// An RPC session. Used to perform in-memory RPC queries (ie. RPC queries that don't go through
/// the HTTP or WebSockets server).
#[derive(Clone)]
pub struct RpcSession {
	metadata: sc_rpc::Metadata,
}

impl RpcSession {
	/// Creates an RPC session.
	///
	/// The `sender` is stored inside the `RpcSession` and is used to communicate spontaneous JSON
	/// messages.
	///
	/// The `RpcSession` must be kept alive in order to receive messages on the sender.
	pub fn new(sender: futures01::sync::mpsc::Sender<String>) -> RpcSession {
		RpcSession {
			metadata: sender.into(),
		}
	}
}

/// Transaction pool adapter.
pub struct TransactionPoolAdapter<C, P> {
	imports_external_transactions: bool,
	pool: Arc<P>,
	client: Arc<C>,
}

/// Get transactions for propagation.
///
/// Function extracted to simplify the test and prevent creating `ServiceFactory`.
fn transactions_to_propagate<Pool, B, H, E>(pool: &Pool)
	-> Vec<(H, B::Extrinsic)>
where
	Pool: TransactionPool<Block=B, Hash=H, Error=E>,
	B: BlockT,
	H: std::hash::Hash + Eq + sp_runtime::traits::Member + sp_runtime::traits::MaybeSerialize,
	E: IntoPoolError + From<sp_transaction_pool::error::Error>,
{
	pool.ready()
		.filter(|t| t.is_propagable())
		.map(|t| {
			let hash = t.hash().clone();
			let ex: B::Extrinsic = t.data().clone();
			(hash, ex)
		})
		.collect()
}

impl<B, H, C, Pool, E> sc_network::config::TransactionPool<H, B> for
	TransactionPoolAdapter<C, Pool>
where
	C: sc_network::config::Client<B> + Send + Sync,
	Pool: 'static + TransactionPool<Block=B, Hash=H, Error=E>,
	B: BlockT,
	H: std::hash::Hash + Eq + sp_runtime::traits::Member + sp_runtime::traits::MaybeSerialize,
	E: 'static + IntoPoolError + From<sp_transaction_pool::error::Error>,
{
	fn transactions(&self) -> Vec<(H, B::Extrinsic)> {
		transactions_to_propagate(&*self.pool)
	}

	fn hash_of(&self, transaction: &B::Extrinsic) -> H {
		self.pool.hash_of(transaction)
	}

	fn import(
		&self,
		transaction: B::Extrinsic,
	) -> TransactionImportFuture {
		if !self.imports_external_transactions {
			debug!("Transaction rejected");
			Box::pin(futures::future::ready(TransactionImport::None));
		}

		let encoded = transaction.encode();
		let uxt = match Decode::decode(&mut &encoded[..]) {
			Ok(uxt) => uxt,
			Err(e) => {
				debug!("Transaction invalid: {:?}", e);
				return Box::pin(futures::future::ready(TransactionImport::Bad));
			}
		};

		let best_block_id = BlockId::hash(self.client.info().best_hash);

		let import_future = self.pool.submit_one(&best_block_id, sp_transaction_pool::TransactionSource::External, uxt);
		Box::pin(async move {
			match import_future.await {
				Ok(_) => TransactionImport::NewGood,
				Err(e) => match e.into_pool_error() {
					Ok(sp_transaction_pool::error::Error::AlreadyImported(_)) => TransactionImport::KnownGood,
					Ok(e) => {
						debug!("Error adding transaction to the pool: {:?}", e);
						TransactionImport::Bad
					}
					Err(e) => {
						debug!("Error converting pool error: {:?}", e);
						// it is not bad at least, just some internal node logic error, so peer is innocent.
						TransactionImport::KnownGood
					}
				}
			}
		})
	}

	fn on_broadcasted(&self, propagations: HashMap<H, Vec<String>>) {
		self.pool.on_broadcasted(propagations)
	}

	fn transaction(&self, hash: &H) -> Option<B::Extrinsic> {
		self.pool.ready_transaction(hash)
			.and_then(
				// Only propagable transactions should be resolved for network service.
				|tx| if tx.is_propagable() { Some(tx.data().clone()) } else { None }
			)
	}
}

#[cfg(test)]
mod tests {
	use super::*;
	use futures::executor::block_on;
	use sp_consensus::SelectChain;
	use sp_runtime::traits::BlindCheckable;
	use substrate_test_runtime_client::{prelude::*, runtime::{Extrinsic, Transfer}};
	use sc_transaction_pool::{BasicPool, FullChainApi};

	#[test]
	fn should_not_propagate_transactions_that_are_marked_as_such() {
		// given
		let (client, longest_chain) = TestClientBuilder::new().build_with_longest_chain();
		let client = Arc::new(client);
		let spawner = sp_core::testing::SpawnBlockingExecutor::new();
		let pool = BasicPool::new_full(
			Default::default(),
			Arc::new(FullChainApi::new(client.clone(), None)),
			None,
			spawner,
			client.clone(),
		);
		let source = sp_runtime::transaction_validity::TransactionSource::External;
		let best = longest_chain.best_chain().unwrap();
		let transaction = Transfer {
			amount: 5,
			nonce: 0,
			from: AccountKeyring::Alice.into(),
			to: Default::default(),
		}.into_signed_tx();
		block_on(pool.submit_one(
			&BlockId::hash(best.hash()), source, transaction.clone()),
		).unwrap();
		block_on(pool.submit_one(
			&BlockId::hash(best.hash()), source, Extrinsic::IncludeData(vec![1])),
		).unwrap();
		assert_eq!(pool.status().ready, 2);

		// when
		let transactions = transactions_to_propagate(&*pool);

		// then
		assert_eq!(transactions.len(), 1);
		assert!(transactions[0].1.clone().check().is_ok());
		// this should not panic
		let _ = transactions[0].1.transfer();
	}
}