570 lines
20 KiB
Rust
570 lines
20 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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//! Eth RPC interface for the light client.
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use std::sync::Arc;
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use jsonrpc_core::{Result, BoxFuture};
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use jsonrpc_core::futures::{future, Future};
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use jsonrpc_core::futures::future::Either;
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use jsonrpc_macros::Trailing;
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use light::cache::Cache as LightDataCache;
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use light::client::LightChainClient;
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use light::{cht, TransactionQueue};
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use light::on_demand::{request, OnDemand};
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use ethcore::account_provider::{AccountProvider, DappId};
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use ethcore::encoded;
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use ethcore::ids::BlockId;
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use ethcore::filter::Filter as EthcoreFilter;
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use ethcore::transaction::SignedTransaction;
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use ethsync::LightSync;
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use rlp::UntrustedRlp;
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use hash::{KECCAK_NULL_RLP, KECCAK_EMPTY_LIST_RLP};
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use bigint::prelude::U256;
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use parking_lot::{RwLock, Mutex};
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use v1::impls::eth_filter::Filterable;
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use v1::helpers::{errors, limit_logs};
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use v1::helpers::{PollFilter, PollManager};
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use v1::helpers::light_fetch::{self, LightFetch};
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use v1::traits::Eth;
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use v1::types::{
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RichBlock, Block, BlockTransactions, BlockNumber, Bytes, SyncStatus, SyncInfo,
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Transaction, CallRequest, Index, Filter, Log, Receipt, Work,
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H64 as RpcH64, H256 as RpcH256, H160 as RpcH160, U256 as RpcU256,
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};
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use v1::metadata::Metadata;
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const NO_INVALID_BACK_REFS: &'static str = "Fails only on invalid back-references; back-references here known to be valid; qed";
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/// Light client `ETH` (and filter) RPC.
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pub struct EthClient<T> {
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sync: Arc<LightSync>,
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client: Arc<T>,
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on_demand: Arc<OnDemand>,
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transaction_queue: Arc<RwLock<TransactionQueue>>,
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accounts: Arc<AccountProvider>,
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cache: Arc<Mutex<LightDataCache>>,
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polls: Mutex<PollManager<PollFilter>>,
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gas_price_percentile: usize,
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}
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impl<T> Clone for EthClient<T> {
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fn clone(&self) -> Self {
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// each instance should have its own poll manager.
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EthClient {
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sync: self.sync.clone(),
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client: self.client.clone(),
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on_demand: self.on_demand.clone(),
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transaction_queue: self.transaction_queue.clone(),
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accounts: self.accounts.clone(),
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cache: self.cache.clone(),
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polls: Mutex::new(PollManager::new()),
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gas_price_percentile: self.gas_price_percentile,
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}
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}
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}
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impl<T: LightChainClient + 'static> EthClient<T> {
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/// Create a new `EthClient` with a handle to the light sync instance, client,
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/// and on-demand request service, which is assumed to be attached as a handler.
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pub fn new(
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sync: Arc<LightSync>,
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client: Arc<T>,
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on_demand: Arc<OnDemand>,
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transaction_queue: Arc<RwLock<TransactionQueue>>,
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accounts: Arc<AccountProvider>,
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cache: Arc<Mutex<LightDataCache>>,
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gas_price_percentile: usize,
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) -> Self {
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EthClient {
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sync,
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client,
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on_demand,
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transaction_queue,
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accounts,
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cache,
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polls: Mutex::new(PollManager::new()),
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gas_price_percentile,
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}
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}
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/// Create a light data fetcher instance.
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fn fetcher(&self) -> LightFetch {
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LightFetch {
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client: self.client.clone(),
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on_demand: self.on_demand.clone(),
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sync: self.sync.clone(),
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cache: self.cache.clone(),
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gas_price_percentile: self.gas_price_percentile,
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}
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}
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// get a "rich" block structure. Fails on unknown block.
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fn rich_block(&self, id: BlockId, include_txs: bool) -> BoxFuture<RichBlock> {
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let (on_demand, sync) = (self.on_demand.clone(), self.sync.clone());
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let (client, engine) = (self.client.clone(), self.client.engine().clone());
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let eip86_transition = self.client.eip86_transition();
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// helper for filling out a rich block once we've got a block and a score.
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let fill_rich = move |block: encoded::Block, score: Option<U256>| {
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let header = block.decode_header();
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let extra_info = engine.extra_info(&header);
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RichBlock {
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inner: Block {
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hash: Some(header.hash().into()),
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size: Some(block.rlp().as_raw().len().into()),
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parent_hash: header.parent_hash().clone().into(),
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uncles_hash: header.uncles_hash().clone().into(),
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author: header.author().clone().into(),
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miner: header.author().clone().into(),
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state_root: header.state_root().clone().into(),
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transactions_root: header.transactions_root().clone().into(),
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receipts_root: header.receipts_root().clone().into(),
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number: Some(header.number().into()),
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gas_used: header.gas_used().clone().into(),
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gas_limit: header.gas_limit().clone().into(),
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logs_bloom: header.log_bloom().clone().into(),
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timestamp: header.timestamp().into(),
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difficulty: header.difficulty().clone().into(),
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total_difficulty: score.map(Into::into),
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seal_fields: header.seal().into_iter().cloned().map(Into::into).collect(),
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uncles: block.uncle_hashes().into_iter().map(Into::into).collect(),
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transactions: match include_txs {
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true => BlockTransactions::Full(block.view().localized_transactions().into_iter().map(|t| Transaction::from_localized(t, eip86_transition)).collect()),
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_ => BlockTransactions::Hashes(block.transaction_hashes().into_iter().map(Into::into).collect()),
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},
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extra_data: Bytes::new(header.extra_data().clone()),
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},
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extra_info: extra_info
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}
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};
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// get the block itself.
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Box::new(self.fetcher().block(id).and_then(move |block| {
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// then fetch the total difficulty (this is much easier after getting the block).
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match client.score(id) {
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Some(score) => Either::A(future::ok(fill_rich(block, Some(score)))),
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None => {
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// make a CHT request to fetch the chain score.
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let req = cht::block_to_cht_number(block.number())
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.and_then(|num| client.cht_root(num as usize))
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.and_then(|root| request::HeaderProof::new(block.number(), root));
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let req = match req {
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Some(req) => req,
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None => {
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// somehow the genesis block slipped past other checks.
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// return it now.
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let score = client.block_header(BlockId::Number(0))
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.expect("genesis always stored; qed")
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.difficulty();
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return Either::A(future::ok(fill_rich(block, Some(score))))
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}
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};
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// three possible outcomes:
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// - network is down.
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// - we get a score, but our hash is non-canonical.
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// - we get a score, and our hash is canonical.
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let maybe_fut = sync.with_context(move |ctx| on_demand.request(ctx, req).expect(NO_INVALID_BACK_REFS));
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match maybe_fut {
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Some(fut) => Either::B(fut
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.map(move |(hash, score)| {
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let score = if hash == block.hash() {
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Some(score)
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} else {
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None
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};
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fill_rich(block, score)
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}).map_err(errors::on_demand_cancel)),
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None => Either::A(future::err(errors::network_disabled())),
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}
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}
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}
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}))
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}
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}
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impl<T: LightChainClient + 'static> Eth for EthClient<T> {
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type Metadata = Metadata;
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fn protocol_version(&self) -> Result<String> {
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Ok(format!("{}", ::light::net::MAX_PROTOCOL_VERSION))
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}
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fn syncing(&self) -> Result<SyncStatus> {
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if self.sync.is_major_importing() {
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let chain_info = self.client.chain_info();
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let current_block = U256::from(chain_info.best_block_number);
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let highest_block = self.sync.highest_block().map(U256::from)
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.unwrap_or_else(|| current_block.clone());
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Ok(SyncStatus::Info(SyncInfo {
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starting_block: U256::from(self.sync.start_block()).into(),
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current_block: current_block.into(),
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highest_block: highest_block.into(),
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warp_chunks_amount: None,
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warp_chunks_processed: None,
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}))
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} else {
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Ok(SyncStatus::None)
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}
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}
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fn author(&self, _meta: Self::Metadata) -> Result<RpcH160> {
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Ok(Default::default())
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}
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fn is_mining(&self) -> Result<bool> {
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Ok(false)
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}
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fn hashrate(&self) -> Result<RpcU256> {
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Ok(Default::default())
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}
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fn gas_price(&self) -> Result<RpcU256> {
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Ok(self.cache.lock().gas_price_corpus()
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.and_then(|c| c.percentile(self.gas_price_percentile).cloned())
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.map(RpcU256::from)
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.unwrap_or_else(Default::default))
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}
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fn accounts(&self, meta: Metadata) -> Result<Vec<RpcH160>> {
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let dapp: DappId = meta.dapp_id().into();
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self.accounts
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.note_dapp_used(dapp.clone())
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.and_then(|_| self.accounts.dapp_addresses(dapp))
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.map_err(|e| errors::account("Could not fetch accounts.", e))
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.map(|accs| accs.into_iter().map(Into::<RpcH160>::into).collect())
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}
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fn block_number(&self) -> Result<RpcU256> {
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Ok(self.client.chain_info().best_block_number.into())
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}
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fn balance(&self, address: RpcH160, num: Trailing<BlockNumber>) -> BoxFuture<RpcU256> {
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Box::new(self.fetcher().account(address.into(), num.unwrap_or_default().into())
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.map(|acc| acc.map_or(0.into(), |a| a.balance).into()))
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}
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fn storage_at(&self, _address: RpcH160, _key: RpcU256, _num: Trailing<BlockNumber>) -> BoxFuture<RpcH256> {
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Box::new(future::err(errors::unimplemented(None)))
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}
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fn block_by_hash(&self, hash: RpcH256, include_txs: bool) -> BoxFuture<Option<RichBlock>> {
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Box::new(self.rich_block(BlockId::Hash(hash.into()), include_txs).map(Some))
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}
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fn block_by_number(&self, num: BlockNumber, include_txs: bool) -> BoxFuture<Option<RichBlock>> {
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Box::new(self.rich_block(num.into(), include_txs).map(Some))
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}
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fn transaction_count(&self, address: RpcH160, num: Trailing<BlockNumber>) -> BoxFuture<RpcU256> {
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Box::new(self.fetcher().account(address.into(), num.unwrap_or_default().into())
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.map(|acc| acc.map_or(0.into(), |a| a.nonce).into()))
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}
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fn block_transaction_count_by_hash(&self, hash: RpcH256) -> BoxFuture<Option<RpcU256>> {
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let (sync, on_demand) = (self.sync.clone(), self.on_demand.clone());
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Box::new(self.fetcher().header(BlockId::Hash(hash.into())).and_then(move |hdr| {
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if hdr.transactions_root() == KECCAK_NULL_RLP {
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Either::A(future::ok(Some(U256::from(0).into())))
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} else {
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sync.with_context(|ctx| on_demand.request(ctx, request::Body(hdr.into())))
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.map(|x| x.expect(NO_INVALID_BACK_REFS))
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.map(|x| x.map(|b| Some(U256::from(b.transactions_count()).into())))
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.map(|x| Either::B(x.map_err(errors::on_demand_cancel)))
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.unwrap_or_else(|| Either::A(future::err(errors::network_disabled())))
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}
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}))
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}
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fn block_transaction_count_by_number(&self, num: BlockNumber) -> BoxFuture<Option<RpcU256>> {
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let (sync, on_demand) = (self.sync.clone(), self.on_demand.clone());
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Box::new(self.fetcher().header(num.into()).and_then(move |hdr| {
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if hdr.transactions_root() == KECCAK_NULL_RLP {
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Either::A(future::ok(Some(U256::from(0).into())))
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} else {
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sync.with_context(|ctx| on_demand.request(ctx, request::Body(hdr.into())))
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.map(|x| x.expect(NO_INVALID_BACK_REFS))
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.map(|x| x.map(|b| Some(U256::from(b.transactions_count()).into())))
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.map(|x| Either::B(x.map_err(errors::on_demand_cancel)))
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.unwrap_or_else(|| Either::A(future::err(errors::network_disabled())))
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}
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}))
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}
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fn block_uncles_count_by_hash(&self, hash: RpcH256) -> BoxFuture<Option<RpcU256>> {
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let (sync, on_demand) = (self.sync.clone(), self.on_demand.clone());
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Box::new(self.fetcher().header(BlockId::Hash(hash.into())).and_then(move |hdr| {
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if hdr.uncles_hash() == KECCAK_EMPTY_LIST_RLP {
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Either::A(future::ok(Some(U256::from(0).into())))
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} else {
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sync.with_context(|ctx| on_demand.request(ctx, request::Body(hdr.into())))
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.map(|x| x.expect(NO_INVALID_BACK_REFS))
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.map(|x| x.map(|b| Some(U256::from(b.uncles_count()).into())))
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.map(|x| Either::B(x.map_err(errors::on_demand_cancel)))
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.unwrap_or_else(|| Either::A(future::err(errors::network_disabled())))
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}
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}))
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}
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fn block_uncles_count_by_number(&self, num: BlockNumber) -> BoxFuture<Option<RpcU256>> {
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let (sync, on_demand) = (self.sync.clone(), self.on_demand.clone());
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Box::new(self.fetcher().header(num.into()).and_then(move |hdr| {
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if hdr.uncles_hash() == KECCAK_EMPTY_LIST_RLP {
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Either::B(future::ok(Some(U256::from(0).into())))
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} else {
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sync.with_context(|ctx| on_demand.request(ctx, request::Body(hdr.into())))
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.map(|x| x.expect(NO_INVALID_BACK_REFS))
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.map(|x| x.map(|b| Some(U256::from(b.uncles_count()).into())))
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.map(|x| Either::A(x.map_err(errors::on_demand_cancel)))
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.unwrap_or_else(|| Either::B(future::err(errors::network_disabled())))
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}
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}))
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}
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fn code_at(&self, _address: RpcH160, _num: Trailing<BlockNumber>) -> BoxFuture<Bytes> {
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Box::new(future::err(errors::unimplemented(None)))
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}
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fn send_raw_transaction(&self, raw: Bytes) -> Result<RpcH256> {
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let best_header = self.client.best_block_header().decode();
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UntrustedRlp::new(&raw.into_vec()).as_val()
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.map_err(errors::rlp)
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.and_then(|tx| {
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self.client.engine().verify_transaction_basic(&tx, &best_header)
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.map_err(errors::transaction)?;
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let signed = SignedTransaction::new(tx).map_err(errors::transaction)?;
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let hash = signed.hash();
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self.transaction_queue.write().import(signed.into())
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.map(|_| hash)
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.map_err(Into::into)
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.map_err(errors::transaction)
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})
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.map(Into::into)
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}
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fn submit_transaction(&self, raw: Bytes) -> Result<RpcH256> {
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self.send_raw_transaction(raw)
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}
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fn call(&self, _meta: Self::Metadata, req: CallRequest, num: Trailing<BlockNumber>) -> BoxFuture<Bytes> {
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Box::new(self.fetcher().proved_execution(req, num).and_then(|res| {
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match res {
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Ok(exec) => Ok(exec.output.into()),
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Err(e) => Err(errors::execution(e)),
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}
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}))
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}
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fn estimate_gas(&self, _meta: Self::Metadata, req: CallRequest, num: Trailing<BlockNumber>) -> BoxFuture<RpcU256> {
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// TODO: binary chop for more accurate estimates.
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Box::new(self.fetcher().proved_execution(req, num).and_then(|res| {
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match res {
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Ok(exec) => Ok((exec.refunded + exec.gas_used).into()),
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Err(e) => Err(errors::execution(e)),
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}
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}))
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}
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fn transaction_by_hash(&self, hash: RpcH256) -> BoxFuture<Option<Transaction>> {
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let hash = hash.into();
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let eip86 = self.client.eip86_transition();
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{
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let tx_queue = self.transaction_queue.read();
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if let Some(tx) = tx_queue.get(&hash) {
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return Box::new(future::ok(Some(Transaction::from_pending(
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tx.clone(),
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self.client.chain_info().best_block_number,
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eip86,
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))));
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}
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}
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Box::new(self.fetcher().transaction_by_hash(hash, eip86).map(|x| x.map(|(tx, _)| tx)))
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}
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fn transaction_by_block_hash_and_index(&self, hash: RpcH256, idx: Index) -> BoxFuture<Option<Transaction>> {
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let eip86 = self.client.eip86_transition();
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Box::new(self.fetcher().block(BlockId::Hash(hash.into())).map(move |block| {
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light_fetch::extract_transaction_at_index(block, idx.value(), eip86)
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}))
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}
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fn transaction_by_block_number_and_index(&self, num: BlockNumber, idx: Index) -> BoxFuture<Option<Transaction>> {
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let eip86 = self.client.eip86_transition();
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Box::new(self.fetcher().block(num.into()).map(move |block| {
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light_fetch::extract_transaction_at_index(block, idx.value(), eip86)
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}))
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}
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fn transaction_receipt(&self, hash: RpcH256) -> BoxFuture<Option<Receipt>> {
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let eip86 = self.client.eip86_transition();
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let fetcher = self.fetcher();
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Box::new(fetcher.transaction_by_hash(hash.clone().into(), eip86).and_then(move |tx| {
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// the block hash included in the transaction object here has
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// already been checked for canonicality and whether it contains
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// the transaction.
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match tx {
|
|
Some((tx, index)) => match tx.block_hash.clone() {
|
|
Some(block_hash) => {
|
|
let extract_receipt = fetcher.receipts(BlockId::Hash(block_hash.clone().into()))
|
|
.and_then(move |mut receipts| future::ok(receipts.swap_remove(index)))
|
|
.map(Receipt::from)
|
|
.map(move |mut receipt| {
|
|
receipt.transaction_hash = Some(hash);
|
|
receipt.transaction_index = Some(index.into());
|
|
receipt.block_hash = Some(block_hash);
|
|
receipt.block_number = tx.block_number;
|
|
receipt
|
|
})
|
|
.map(Some);
|
|
|
|
Either::B(extract_receipt)
|
|
}
|
|
None => Either::A(future::err(errors::unknown_block())),
|
|
},
|
|
None => Either::A(future::ok(None)),
|
|
}
|
|
}))
|
|
}
|
|
|
|
fn uncle_by_block_hash_and_index(&self, hash: RpcH256, idx: Index) -> BoxFuture<Option<RichBlock>> {
|
|
let client = self.client.clone();
|
|
Box::new(self.fetcher().block(BlockId::Hash(hash.into())).map(move |block| {
|
|
extract_uncle_at_index(block, idx, client)
|
|
}))
|
|
}
|
|
|
|
fn uncle_by_block_number_and_index(&self, num: BlockNumber, idx: Index) -> BoxFuture<Option<RichBlock>> {
|
|
let client = self.client.clone();
|
|
Box::new(self.fetcher().block(num.into()).map(move |block| {
|
|
extract_uncle_at_index(block, idx, client)
|
|
}))
|
|
}
|
|
|
|
fn compilers(&self) -> Result<Vec<String>> {
|
|
Err(errors::deprecated("Compilation functionality is deprecated.".to_string()))
|
|
}
|
|
|
|
fn compile_lll(&self, _: String) -> Result<Bytes> {
|
|
Err(errors::deprecated("Compilation of LLL via RPC is deprecated".to_string()))
|
|
}
|
|
|
|
fn compile_serpent(&self, _: String) -> Result<Bytes> {
|
|
Err(errors::deprecated("Compilation of Serpent via RPC is deprecated".to_string()))
|
|
}
|
|
|
|
fn compile_solidity(&self, _: String) -> Result<Bytes> {
|
|
Err(errors::deprecated("Compilation of Solidity via RPC is deprecated".to_string()))
|
|
}
|
|
|
|
fn logs(&self, filter: Filter) -> BoxFuture<Vec<Log>> {
|
|
let limit = filter.limit;
|
|
|
|
Box::new(Filterable::logs(self, filter.into())
|
|
.map(move|logs| limit_logs(logs, limit)))
|
|
}
|
|
|
|
fn work(&self, _timeout: Trailing<u64>) -> Result<Work> {
|
|
Err(errors::light_unimplemented(None))
|
|
}
|
|
|
|
fn submit_work(&self, _nonce: RpcH64, _pow_hash: RpcH256, _mix_hash: RpcH256) -> Result<bool> {
|
|
Err(errors::light_unimplemented(None))
|
|
}
|
|
|
|
fn submit_hashrate(&self, _rate: RpcU256, _id: RpcH256) -> Result<bool> {
|
|
Err(errors::light_unimplemented(None))
|
|
}
|
|
}
|
|
|
|
// This trait implementation triggers a blanked impl of `EthFilter`.
|
|
impl<T: LightChainClient + 'static> Filterable for EthClient<T> {
|
|
fn best_block_number(&self) -> u64 { self.client.chain_info().best_block_number }
|
|
|
|
fn block_hash(&self, id: BlockId) -> Option<RpcH256> {
|
|
self.client.block_hash(id).map(Into::into)
|
|
}
|
|
|
|
fn pending_transactions_hashes(&self, _block_number: u64) -> Vec<::bigint::hash::H256> {
|
|
Vec::new()
|
|
}
|
|
|
|
fn logs(&self, filter: EthcoreFilter) -> BoxFuture<Vec<Log>> {
|
|
self.fetcher().logs(filter)
|
|
}
|
|
|
|
fn pending_logs(&self, _block_number: u64, _filter: &EthcoreFilter) -> Vec<Log> {
|
|
Vec::new() // light clients don't mine.
|
|
}
|
|
|
|
fn polls(&self) -> &Mutex<PollManager<PollFilter>> {
|
|
&self.polls
|
|
}
|
|
}
|
|
|
|
fn extract_uncle_at_index<T: LightChainClient>(block: encoded::Block, index: Index, client: Arc<T>) -> Option<RichBlock> {
|
|
let uncle = match block.uncles().into_iter().nth(index.value()) {
|
|
Some(u) => u,
|
|
None => return None,
|
|
};
|
|
|
|
let extra_info = client.engine().extra_info(&uncle);
|
|
Some(RichBlock {
|
|
inner: Block {
|
|
hash: Some(uncle.hash().into()),
|
|
size: None,
|
|
parent_hash: uncle.parent_hash().clone().into(),
|
|
uncles_hash: uncle.uncles_hash().clone().into(),
|
|
author: uncle.author().clone().into(),
|
|
miner: uncle.author().clone().into(),
|
|
state_root: uncle.state_root().clone().into(),
|
|
transactions_root: uncle.transactions_root().clone().into(),
|
|
number: Some(uncle.number().into()),
|
|
gas_used: uncle.gas_used().clone().into(),
|
|
gas_limit: uncle.gas_limit().clone().into(),
|
|
logs_bloom: uncle.log_bloom().clone().into(),
|
|
timestamp: uncle.timestamp().into(),
|
|
difficulty: uncle.difficulty().clone().into(),
|
|
total_difficulty: None,
|
|
receipts_root: uncle.receipts_root().clone().into(),
|
|
extra_data: uncle.extra_data().clone().into(),
|
|
seal_fields: uncle.seal().into_iter().cloned().map(Into::into).collect(),
|
|
uncles: vec![],
|
|
transactions: BlockTransactions::Hashes(vec![]),
|
|
},
|
|
extra_info: extra_info,
|
|
})
|
|
}
|