Bad blocks RPC + reporting (#9433)

* Bad blocks RPC.

* Return bad blocks via RPC.

* Fix test.

* More verbose bad block message.

* Expose via CLI.

* Remove stray whitespace.

* Remove stray newline.

* Fix tests.

ethcore/src/client/bad_blocks.rs

@@ -0,0 +1,81 @@
+// Copyright 2015-2018 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+
+// Parity 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.
+
+// Parity 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 Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Stores recently seen bad blocks.
+
+use bytes::{Bytes, ToPretty};
+use ethereum_types::H256;
+use itertools::Itertools;
+use memory_cache::MemoryLruCache;
+use parking_lot::RwLock;
+use verification::queue::kind::blocks::Unverified;
+
+/// Recently seen bad blocks.
+pub struct BadBlocks {
+	last_blocks: RwLock<MemoryLruCache<H256, (Unverified, String)>>,
+}
+
+impl Default for BadBlocks {
+	fn default() -> Self {
+		BadBlocks {
+			last_blocks: RwLock::new(MemoryLruCache::new(8 * 1024 * 1024)),
+		}
+	}
+}
+
+impl BadBlocks {
+	/// Reports given RLP as invalid block.
+	pub fn report(&self, raw: Bytes, message: String) {
+		match Unverified::from_rlp(raw) {
+			Ok(unverified) => {
+				error!(
+					target: "client",
+					"\nBad block detected: {}\nRLP: {}\nHeader: {:?}\nUncles: {}\nTransactions:{}\n",
+					message,
+					unverified.bytes.to_hex(),
+					unverified.header,
+					unverified.uncles
+						.iter()
+						.enumerate()
+						.map(|(index, uncle)| format!("[Uncle {}] {:?}", index, uncle))
+						.join("\n"),
+					unverified.transactions
+						.iter()
+						.enumerate()
+						.map(|(index, tx)| format!("[Tx {}] {:?}", index, tx))
+						.join("\n"),
+				);
+				self.last_blocks.write().insert(unverified.header.hash(), (unverified, message));
+			},
+			Err(err) => {
+				error!(target: "client", "Bad undecodable block detected: {}\n{:?}", message, err);
+			},
+		}
+	}
+
+	/// Returns a list of recently detected bad blocks with error descriptions.
+	pub fn bad_blocks(&self) -> Vec<(Unverified, String)> {
+		self.last_blocks.read()
+			.backstore()
+			.iter()
+			.map(|(_k, (unverified, message))| (
+				Unverified::from_rlp(unverified.bytes.clone())
+					.expect("Bytes coming from UnverifiedBlock so decodable; qed"),
+				message.clone(),
+			))
+			.collect()
+	}
+}

ethcore/src/client/client.rs

@@ -39,14 +39,15 @@ use client::{
 	RegistryInfo, ReopenBlock, PrepareOpenBlock, ScheduleInfo, ImportSealedBlock,
 	BroadcastProposalBlock, ImportBlock, StateOrBlock, StateInfo, StateClient, Call,
 	AccountData, BlockChain as BlockChainTrait, BlockProducer, SealedBlockImporter,
-	ClientIoMessage
+	ClientIoMessage,
 };
 use client::{
 	BlockId, TransactionId, UncleId, TraceId, ClientConfig, BlockChainClient,
 	TraceFilter, CallAnalytics, BlockImportError, Mode,
 	ChainNotify, ChainRoute, PruningInfo, ProvingBlockChainClient, EngineInfo, ChainMessageType,
-	IoClient,
+	IoClient, BadBlocks,
 };
+use client::bad_blocks;
 use encoded;
 use engines::{EthEngine, EpochTransition, ForkChoice};
 use error::{
@@ -163,6 +164,9 @@ struct Importer {
 
 	/// Ethereum engine to be used during import
 	pub engine: Arc<EthEngine>,
+
+	/// A lru cache of recently detected bad blocks
+	pub bad_blocks: bad_blocks::BadBlocks,
 }
 
 /// Blockchain database client backed by a persistent database. Owns and manages a blockchain and a block queue.
@@ -254,6 +258,7 @@ impl Importer {
 			miner,
 			ancient_verifier: AncientVerifier::new(engine.clone()),
 			engine,
+			bad_blocks: Default::default(),
 		})
 	}
 
@@ -291,7 +296,9 @@ impl Importer {
 					continue;
 				}
 
-				if let Ok(closed_block) = self.check_and_lock_block(block, client) {
+				let raw = block.bytes.clone();
+				match self.check_and_lock_block(block, client) {
+					Ok(closed_block) => {
 						if self.engine.is_proposal(&header) {
 							self.block_queue.mark_as_good(&[hash]);
 							proposed_blocks.push(bytes);
@@ -305,8 +312,11 @@ impl Importer {
 
 							client.report.write().accrue_block(&header, transactions_len);
 						}
-				} else {
+					},
+					Err(err) => {
+						self.bad_blocks.report(raw, format!("{:?}", err));
 						invalid_blocks.insert(header.hash());
+					},
 				}
 			}
 
@@ -1390,12 +1400,22 @@ impl ImportBlock for Client {
 		if self.chain.read().is_known(&unverified.hash()) {
 			bail!(BlockImportErrorKind::Import(ImportErrorKind::AlreadyInChain));
 		}
+
 		let status = self.block_status(BlockId::Hash(unverified.parent_hash()));
 		if status == BlockStatus::Unknown {
 			bail!(BlockImportErrorKind::Block(BlockError::UnknownParent(unverified.parent_hash())));
 		}
 
-		Ok(self.importer.block_queue.import(unverified)?)
+		let raw = unverified.bytes.clone();
+		match self.importer.block_queue.import(unverified).map_err(Into::into) {
+			Ok(res) => Ok(res),
+			// we only care about block errors (not import errors)
+			Err(BlockImportError(BlockImportErrorKind::Block(err), _))=> {
+				self.importer.bad_blocks.report(raw, format!("{:?}", err));
+				bail!(BlockImportErrorKind::Block(err))
+			},
+			Err(e) => Err(e),
+		}
 	}
 }
 
@@ -1532,6 +1552,12 @@ impl EngineInfo for Client {
 	}
 }
 
+impl BadBlocks for Client {
+	fn bad_blocks(&self) -> Vec<(Unverified, String)> {
+		self.importer.bad_blocks.bad_blocks()
+	}
+}
+
 impl BlockChainClient for Client {
 	fn replay(&self, id: TransactionId, analytics: CallAnalytics) -> Result<Executed, CallError> {
 		let address = self.transaction_address(id).ok_or(CallError::TransactionNotFound)?;

ethcore/src/client/mod.rs

@@ -17,6 +17,7 @@
 //! Blockchain database client.
 
 mod ancient_import;
+mod bad_blocks;
 mod client;
 mod config;
 #[cfg(any(test, feature = "test-helpers"))]
@@ -36,7 +37,7 @@ pub use self::test_client::{TestBlockChainClient, EachBlockWith};
 pub use self::chain_notify::{ChainNotify, ChainRoute, ChainRouteType, ChainMessageType};
 pub use self::traits::{
     Nonce, Balance, ChainInfo, BlockInfo, ReopenBlock, PrepareOpenBlock, CallContract, TransactionInfo, RegistryInfo, ScheduleInfo, ImportSealedBlock, BroadcastProposalBlock, ImportBlock,
-    StateOrBlock, StateClient, Call, EngineInfo, AccountData, BlockChain, BlockProducer, SealedBlockImporter
+    StateOrBlock, StateClient, Call, EngineInfo, AccountData, BlockChain, BlockProducer, SealedBlockImporter, BadBlocks,
 };
 pub use state::StateInfo;
 pub use self::traits::{BlockChainClient, EngineClient, ProvingBlockChainClient, IoClient};

ethcore/src/client/test_client.rs

@@ -39,7 +39,8 @@ use client::{
 	PrepareOpenBlock, BlockChainClient, BlockChainInfo, BlockStatus, BlockId, Mode,
 	TransactionId, UncleId, TraceId, TraceFilter, LastHashes, CallAnalytics, BlockImportError,
 	ProvingBlockChainClient, ScheduleInfo, ImportSealedBlock, BroadcastProposalBlock, ImportBlock, StateOrBlock,
-	Call, StateClient, EngineInfo, AccountData, BlockChain, BlockProducer, SealedBlockImporter, IoClient
+	Call, StateClient, EngineInfo, AccountData, BlockChain, BlockProducer, SealedBlockImporter, IoClient,
+	BadBlocks,
 };
 use db::{NUM_COLUMNS, COL_STATE};
 use header::{Header as BlockHeader, BlockNumber};
@@ -615,6 +616,19 @@ impl EngineInfo for TestBlockChainClient {
 	}
 }
 
+impl BadBlocks for TestBlockChainClient {
+	fn bad_blocks(&self) -> Vec<(Unverified, String)> {
+		vec![
+			(Unverified {
+				header: Default::default(),
+				transactions: vec![],
+				uncles: vec![],
+				bytes: vec![1, 2, 3],
+			}, "Invalid block".into())
+		]
+	}
+}
+
 impl BlockChainClient for TestBlockChainClient {
 	fn replay(&self, _id: TransactionId, _analytics: CallAnalytics) -> Result<Executed, CallError> {
 		self.execution_result.read().clone().unwrap()

ethcore/src/client/traits.rs

@@ -211,9 +211,15 @@ pub trait IoClient: Sync + Send {
 	fn queue_consensus_message(&self, message: Bytes);
 }
 
+/// Provides recently seen bad blocks.
+pub trait BadBlocks {
+	/// Returns a list of blocks that were recently not imported because they were invalid.
+	fn bad_blocks(&self) -> Vec<(Unverified, String)>;
+}
+
 /// Blockchain database client. Owns and manages a blockchain and a block queue.
 pub trait BlockChainClient : Sync + Send + AccountData + BlockChain + CallContract + RegistryInfo + ImportBlock
-+ IoClient {
++ IoClient + BadBlocks {
 	/// Look up the block number for the given block ID.
 	fn block_number(&self, id: BlockId) -> Option<BlockNumber>;
 

parity/cli/mod.rs

@@ -477,7 +477,7 @@ usage! {
 
 			ARG arg_jsonrpc_apis: (String) = "web3,eth,pubsub,net,parity,private,parity_pubsub,traces,rpc,shh,shh_pubsub", or |c: &Config| c.rpc.as_ref()?.apis.as_ref().map(|vec| vec.join(",")),
 			"--jsonrpc-apis=[APIS]",
-			"Specify the APIs available through the HTTP JSON-RPC interface using a comma-delimited list of API names. Possible names are: all, safe, web3, net, eth, pubsub, personal, signer, parity, parity_pubsub, parity_accounts, parity_set, traces, rpc, secretstore, shh, shh_pubsub. You can also disable a specific API by putting '-' in the front, example: all,-personal. 'safe' enables the following APIs: web3, net, eth, pubsub, parity, parity_pubsub, traces, rpc, shh, shh_pubsub",
+			"Specify the APIs available through the HTTP JSON-RPC interface using a comma-delimited list of API names. Possible names are: all, safe, debug, web3, net, eth, pubsub, personal, signer, parity, parity_pubsub, parity_accounts, parity_set, traces, rpc, secretstore, shh, shh_pubsub. You can also disable a specific API by putting '-' in the front, example: all,-personal. 'safe' enables the following APIs: web3, net, eth, pubsub, parity, parity_pubsub, traces, rpc, shh, shh_pubsub",
 
 			ARG arg_jsonrpc_hosts: (String) = "none", or |c: &Config| c.rpc.as_ref()?.hosts.as_ref().map(|vec| vec.join(",")),
 			"--jsonrpc-hosts=[HOSTS]",

parity/rpc_apis.rs

@@ -58,18 +58,10 @@ pub enum Api {
 	Signer,
 	/// Parity - Custom extensions (Safe)
 	Parity,
-	/// Parity PubSub - Generic Publish-Subscriber (Safety depends on other APIs exposed).
-	ParityPubSub,
-	/// Parity Accounts extensions (UNSAFE: Passwords, Side Effects (new account))
-	ParityAccounts,
-	/// Parity - Set methods (UNSAFE: Side Effects affecting node operation)
-	ParitySet,
 	/// Traces (Safe)
 	Traces,
 	/// Rpc (Safe)
 	Rpc,
-	/// SecretStore (UNSAFE: arbitrary hash signing)
-	SecretStore,
 	/// Private transaction manager (Safe)
 	Private,
 	/// Whisper (Safe)
@@ -78,6 +70,17 @@ pub enum Api {
 	Whisper,
 	/// Whisper Pub-Sub (Safe but same concerns as above).
 	WhisperPubSub,
+	/// Parity PubSub - Generic Publish-Subscriber (Safety depends on other APIs exposed).
+	ParityPubSub,
+	/// Parity Accounts extensions (UNSAFE: Passwords, Side Effects (new account))
+	ParityAccounts,
+	/// Parity - Set methods (UNSAFE: Side Effects affecting node operation)
+	ParitySet,
+	/// SecretStore (UNSAFE: arbitrary hash signing)
+	SecretStore,
+	/// Geth-compatible (best-effort) debug API (Potentially UNSAFE)
+	/// NOTE We don't aim to support all methods, only the ones that are useful.
+	Debug,
 }
 
 impl FromStr for Api {
@@ -87,22 +90,23 @@ impl FromStr for Api {
 		use self::Api::*;
 
 		match s {
-			"web3" => Ok(Web3),
+			"debug" => Ok(Debug),
-			"net" => Ok(Net),
 			"eth" => Ok(Eth),
-			"pubsub" => Ok(EthPubSub),
+			"net" => Ok(Net),
-			"personal" => Ok(Personal),
-			"signer" => Ok(Signer),
 			"parity" => Ok(Parity),
-			"parity_pubsub" => Ok(ParityPubSub),
 			"parity_accounts" => Ok(ParityAccounts),
+			"parity_pubsub" => Ok(ParityPubSub),
 			"parity_set" => Ok(ParitySet),
-			"traces" => Ok(Traces),
+			"personal" => Ok(Personal),
+			"private" => Ok(Private),
+			"pubsub" => Ok(EthPubSub),
 			"rpc" => Ok(Rpc),
 			"secretstore" => Ok(SecretStore),
-			"private" => Ok(Private),
 			"shh" => Ok(Whisper),
 			"shh_pubsub" => Ok(WhisperPubSub),
+			"signer" => Ok(Signer),
+			"traces" => Ok(Traces),
+			"web3" => Ok(Web3),
 			api => Err(format!("Unknown api: {}", api))
 		}
 	}
@@ -171,20 +175,21 @@ fn to_modules(apis: &HashSet<Api>) -> BTreeMap<String, String> {
 	let mut modules = BTreeMap::new();
 	for api in apis {
 		let (name, version) = match *api {
-			Api::Web3 => ("web3", "1.0"),
+			Api::Debug => ("debug", "1.0"),
-			Api::Net => ("net", "1.0"),
 			Api::Eth => ("eth", "1.0"),
 			Api::EthPubSub => ("pubsub", "1.0"),
-			Api::Personal => ("personal", "1.0"),
+			Api::Net => ("net", "1.0"),
-			Api::Signer => ("signer", "1.0"),
 			Api::Parity => ("parity", "1.0"),
 			Api::ParityAccounts => ("parity_accounts", "1.0"),
 			Api::ParityPubSub => ("parity_pubsub", "1.0"),
 			Api::ParitySet => ("parity_set", "1.0"),
-			Api::Traces => ("traces", "1.0"),
+			Api::Personal => ("personal", "1.0"),
+			Api::Private => ("private", "1.0"),
 			Api::Rpc => ("rpc", "1.0"),
 			Api::SecretStore => ("secretstore", "1.0"),
-			Api::Private => ("private", "1.0"),
+			Api::Signer => ("signer", "1.0"),
+			Api::Traces => ("traces", "1.0"),
+			Api::Web3 => ("web3", "1.0"),
 			Api::Whisper => ("shh", "1.0"),
 			Api::WhisperPubSub => ("shh_pubsub", "1.0"),
 		};
@@ -265,6 +270,9 @@ impl FullDependencies {
 		);
 		for api in apis {
 			match *api {
+				Api::Debug => {
+					handler.extend_with(DebugClient::new(self.client.clone()).to_delegate());
+				},
 				Api::Web3 => {
 					handler.extend_with(Web3Client::new().to_delegate());
 				},
@@ -481,6 +489,9 @@ impl<C: LightChainClient + 'static> LightDependencies<C> {
 
 		for api in apis {
 			match *api {
+				Api::Debug => {
+					warn!(target: "rpc", "Debug API is not available in light client mode.")
+				},
 				Api::Web3 => {
 					handler.extend_with(Web3Client::new().to_delegate());
 				},
@@ -647,6 +658,7 @@ impl ApiSet {
 				public_list
 			},
 			ApiSet::SafeContext => {
+				public_list.insert(Api::Debug);
 				public_list.insert(Api::Traces);
 				public_list.insert(Api::ParityPubSub);
 				public_list.insert(Api::ParityAccounts);
@@ -656,6 +668,7 @@ impl ApiSet {
 				public_list
 			},
 			ApiSet::All => {
+				public_list.insert(Api::Debug);
 				public_list.insert(Api::Traces);
 				public_list.insert(Api::ParityPubSub);
 				public_list.insert(Api::ParityAccounts);
@@ -682,6 +695,7 @@ mod test {
 
 	#[test]
 	fn test_api_parsing() {
+		assert_eq!(Api::Debug, "debug".parse().unwrap());
 		assert_eq!(Api::Web3, "web3".parse().unwrap());
 		assert_eq!(Api::Net, "net".parse().unwrap());
 		assert_eq!(Api::Eth, "eth".parse().unwrap());
@@ -738,7 +752,7 @@ mod test {
 			// semi-safe
 			Api::ParityAccounts,
 			// Unsafe
-			Api::ParitySet, Api::Signer,
+			Api::ParitySet, Api::Signer, Api::Debug
 		].into_iter().collect();
 		assert_eq!(ApiSet::SafeContext.list_apis(), expected);
 	}
@@ -751,6 +765,7 @@ mod test {
 			Api::ParitySet, Api::Signer,
 			Api::Personal,
 			Api::Private,
+			Api::Debug,
 		].into_iter().collect()));
 	}
 
@@ -760,7 +775,7 @@ mod test {
 			Api::Web3, Api::Net, Api::Eth, Api::EthPubSub, Api::Parity, Api::ParityPubSub, Api::Traces, Api::Rpc, Api::SecretStore, Api::Whisper, Api::WhisperPubSub,
 			Api::ParityAccounts,
 			Api::ParitySet, Api::Signer,
-			Api::Private
+			Api::Private, Api::Debug,
 		].into_iter().collect()));
 	}
 

rpc/src/v1/impls/debug.rs

@@ -0,0 +1,96 @@
+// Copyright 2015-2018 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+
+// Parity 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.
+
+// Parity 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 Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Debug APIs RPC implementation
+
+use std::sync::Arc;
+
+use ethcore::client::BlockChainClient;
+use transaction::LocalizedTransaction;
+
+use jsonrpc_core::Result;
+use v1::traits::Debug;
+use v1::types::{Block, Bytes, RichBlock, BlockTransactions, Transaction};
+
+/// Debug rpc implementation.
+pub struct DebugClient<C> {
+	client: Arc<C>,
+}
+
+impl<C> DebugClient<C> {
+	/// Creates new debug client.
+	pub fn new(client: Arc<C>) -> Self {
+		Self {
+			client,
+		}
+	}
+}
+
+impl<C: BlockChainClient + 'static> Debug for DebugClient<C> {
+	fn bad_blocks(&self) -> Result<Vec<RichBlock>> {
+		fn cast<O, T: Copy + Into<O>>(t: &T) -> O {
+			(*t).into()
+		}
+
+		Ok(self.client.bad_blocks().into_iter().map(|(block, reason)| {
+			let number = block.header.number();
+			let hash = block.header.hash();
+			RichBlock {
+				inner: Block {
+					hash: Some(hash.into()),
+					size: Some(block.bytes.len().into()),
+					parent_hash: cast(block.header.parent_hash()),
+					uncles_hash: cast(block.header.uncles_hash()),
+					author: cast(block.header.author()),
+					miner: cast(block.header.author()),
+					state_root: cast(block.header.state_root()),
+					receipts_root: cast(block.header.receipts_root()),
+					number: Some(number.into()),
+					gas_used: cast(block.header.gas_used()),
+					gas_limit: cast(block.header.gas_limit()),
+					logs_bloom: Some(cast(block.header.log_bloom())),
+					timestamp: block.header.timestamp().into(),
+					difficulty: cast(block.header.difficulty()),
+					total_difficulty: None,
+					seal_fields: block.header.seal().into_iter().cloned().map(Into::into).collect(),
+					uncles: block.uncles.into_iter().map(|u| u.hash().into()).collect(),
+					transactions: BlockTransactions::Full(block.transactions
+						.into_iter()
+						.enumerate()
+						.map(|(transaction_index, signed)| Transaction::from_localized(LocalizedTransaction {
+							block_number: number.into(),
+							block_hash: hash.into(),
+							transaction_index,
+							signed,
+							cached_sender: None,
+						})).collect()
+					),
+					transactions_root: cast(block.header.transactions_root()),
+					extra_data: block.header.extra_data().clone().into(),
+				},
+				extra_info: vec![
+					("reason".to_owned(), reason),
+					("rlp".to_owned(), serialize(&Bytes(block.bytes))),
+					("hash".to_owned(), format!("{:#x}", hash)),
+				].into_iter().collect(),
+			}
+		}).collect())
+	}
+}
+
+fn serialize<T: ::serde::Serialize>(t: &T) -> String {
+	::serde_json::to_string(t).expect("RPC types serialization is non-fallible.")
+}

rpc/src/v1/impls/mod.rs

@@ -16,6 +16,7 @@
 
 //! Ethereum rpc interface implementation.
 
+mod debug;
 mod eth;
 mod eth_filter;
 mod eth_pubsub;
@@ -24,18 +25,19 @@ mod parity;
 mod parity_accounts;
 mod parity_set;
 mod personal;
+mod private;
 mod pubsub;
+mod rpc;
+mod secretstore;
 mod signer;
 mod signing;
 mod signing_unsafe;
-mod rpc;
-mod secretstore;
 mod traces;
 mod web3;
-mod private;
 
 pub mod light;
 
+pub use self::debug::DebugClient;
 pub use self::eth::{EthClient, EthClientOptions};
 pub use self::eth_filter::EthFilterClient;
 pub use self::eth_pubsub::EthPubSubClient;
@@ -44,12 +46,12 @@ pub use self::parity::ParityClient;
 pub use self::parity_accounts::ParityAccountsClient;
 pub use self::parity_set::ParitySetClient;
 pub use self::personal::PersonalClient;
+pub use self::private::PrivateClient;
 pub use self::pubsub::PubSubClient;
+pub use self::rpc::RpcClient;
+pub use self::secretstore::SecretStoreClient;
 pub use self::signer::SignerClient;
 pub use self::signing::SigningQueueClient;
 pub use self::signing_unsafe::SigningUnsafeClient;
 pub use self::traces::TracesClient;
 pub use self::web3::Web3Client;
-pub use self::rpc::RpcClient;
-pub use self::secretstore::SecretStoreClient;
-pub use self::private::PrivateClient;

rpc/src/v1/mod.rs

@@ -41,7 +41,7 @@ pub mod informant;
 pub mod metadata;
 pub mod traits;
 
-pub use self::traits::{Web3, Eth, EthFilter, EthPubSub, EthSigning, Net, Parity, ParityAccounts, ParitySet, ParitySigning, PubSub, Signer, Personal, Traces, Rpc, SecretStore, Private};
+pub use self::traits::{Debug, Eth, EthFilter, EthPubSub, EthSigning, Net, Parity, ParityAccounts, ParitySet, ParitySigning, Personal, PubSub, Private, Rpc, SecretStore, Signer, Traces, Web3};
 pub use self::impls::*;
 pub use self::helpers::{NetworkSettings, block_import, dispatch};
 pub use self::metadata::Metadata;

rpc/src/v1/tests/mocked/debug.rs

@@ -0,0 +1,37 @@
+// Copyright 2015-2018 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+
+// Parity 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.
+
+// Parity 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 Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+use std::sync::Arc;
+
+use ethcore::client::TestBlockChainClient;
+
+use jsonrpc_core::IoHandler;
+use v1::{Debug, DebugClient};
+
+fn io() -> IoHandler {
+	let client = Arc::new(TestBlockChainClient::new());
+
+	let mut io = IoHandler::new();
+	io.extend_with(DebugClient::new(client).to_delegate());
+	io
+}
+
+#[test]
+fn rpc_debug_get_bad_blocks() {
+	let request = r#"{"jsonrpc": "2.0", "method": "debug_getBadBlocks", "params": [], "id": 1}"#;
+	let response = "{\"jsonrpc\":\"2.0\",\"result\":[{\"author\":\"0x0000000000000000000000000000000000000000\",\"difficulty\":\"0x0\",\"extraData\":\"0x\",\"gasLimit\":\"0x0\",\"gasUsed\":\"0x0\",\"hash\":\"27bfb37e507ce90da141307204b1c6ba24194380613590ac50ca4b1d7198ff65\",\"logsBloom\":\"0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\",\"miner\":\"0x0000000000000000000000000000000000000000\",\"number\":\"0x0\",\"parentHash\":\"0x0000000000000000000000000000000000000000000000000000000000000000\",\"reason\":\"Invalid block\",\"receiptsRoot\":\"0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421\",\"rlp\":\"\\\"0x010203\\\"\",\"sealFields\":[],\"sha3Uncles\":\"0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347\",\"size\":\"0x3\",\"stateRoot\":\"0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421\",\"timestamp\":\"0x0\",\"totalDifficulty\":null,\"transactions\":[],\"transactionsRoot\":\"0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421\",\"uncles\":[]}],\"id\":1}";
+	assert_eq!(io().handle_request_sync(request), Some(response.to_owned()));
+}

rpc/src/v1/tests/mocked/mod.rs

@@ -17,6 +17,7 @@
 //! RPC mocked tests. Most of these test that the RPC server is serializing and forwarding
 //! method calls properly.
 
+mod debug;
 mod eth;
 mod eth_pubsub;
 mod manage_network;

rpc/src/v1/traits/debug.rs

@@ -0,0 +1,30 @@
+// Copyright 2015-2018 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+
+// Parity 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.
+
+// Parity 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 Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Debug RPC interface.
+
+use jsonrpc_core::Result;
+
+use v1::types::RichBlock;
+
+build_rpc_trait! {
+	/// Debug RPC interface.
+	pub trait Debug {
+		/// Returns recently seen bad blocks.
+		#[rpc(name = "debug_getBadBlocks")]
+		fn bad_blocks(&self) -> Result<Vec<RichBlock>>;
+	}
+}

rpc/src/v1/traits/mod.rs

@@ -16,7 +16,7 @@
 
 //! Ethereum rpc interfaces.
 
-pub mod web3;
+pub mod debug;
 pub mod eth;
 pub mod eth_pubsub;
 pub mod eth_signing;
@@ -26,14 +26,15 @@ pub mod parity_accounts;
 pub mod parity_set;
 pub mod parity_signing;
 pub mod personal;
+pub mod private;
 pub mod pubsub;
-pub mod signer;
-pub mod traces;
 pub mod rpc;
 pub mod secretstore;
-pub mod private;
+pub mod signer;
+pub mod traces;
+pub mod web3;
 
-pub use self::web3::Web3;
+pub use self::debug::Debug;
 pub use self::eth::{Eth, EthFilter};
 pub use self::eth_pubsub::EthPubSub;
 pub use self::eth_signing::EthSigning;
@@ -43,9 +44,10 @@ pub use self::parity_accounts::ParityAccounts;
 pub use self::parity_set::ParitySet;
 pub use self::parity_signing::ParitySigning;
 pub use self::personal::Personal;
+pub use self::private::Private;
 pub use self::pubsub::PubSub;
-pub use self::signer::Signer;
-pub use self::traces::Traces;
 pub use self::rpc::Rpc;
 pub use self::secretstore::SecretStore;
-pub use self::private::Private;
+pub use self::signer::Signer;
+pub use self::traces::Traces;
+pub use self::web3::Web3;

util/memory_cache/src/lib.rs

@@ -86,6 +86,11 @@ impl<K: Eq + Hash, V: HeapSizeOf> MemoryLruCache<K, V> {
 	pub fn current_size(&self) -> usize {
 		self.cur_size
 	}
+
+	/// Get backing LRU cache instance (read only)
+	pub fn backstore(&self) -> &LruCache<K, V> {
+		&self.inner
+	}
 }
 
 #[cfg(test)]