242 lines
8.5 KiB
Rust
242 lines
8.5 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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/// Validator set changing at fork blocks.
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use std::collections::BTreeMap;
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use std::sync::Weak;
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use ethereum_types::{H256, Address};
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use parking_lot::RwLock;
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use bytes::Bytes;
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use ids::BlockId;
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use header::{BlockNumber, Header};
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use client::EngineClient;
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use machine::{AuxiliaryData, Call, EthereumMachine};
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use super::{SystemCall, ValidatorSet};
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type BlockNumberLookup = Box<Fn(BlockId) -> Result<BlockNumber, String> + Send + Sync + 'static>;
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pub struct Multi {
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sets: BTreeMap<BlockNumber, Box<ValidatorSet>>,
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block_number: RwLock<BlockNumberLookup>,
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}
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impl Multi {
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pub fn new(set_map: BTreeMap<BlockNumber, Box<ValidatorSet>>) -> Self {
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assert!(set_map.get(&0u64).is_some(), "ValidatorSet has to be specified from block 0.");
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Multi {
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sets: set_map,
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block_number: RwLock::new(Box::new(move |_| Err("No client!".into()))),
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}
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}
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fn correct_set(&self, id: BlockId) -> Option<&ValidatorSet> {
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match self.block_number.read()(id).map(|parent_block| self.correct_set_by_number(parent_block)) {
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Ok((_, set)) => Some(set),
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Err(e) => {
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debug!(target: "engine", "ValidatorSet could not be recovered: {}", e);
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None
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},
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}
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}
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// get correct set by block number, along with block number at which
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// this set was activated.
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fn correct_set_by_number(&self, parent_block: BlockNumber) -> (BlockNumber, &ValidatorSet) {
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let (block, set) = self.sets.iter()
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.rev()
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.find(|&(block, _)| *block <= parent_block + 1)
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.expect("constructor validation ensures that there is at least one validator set for block 0;
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block 0 is less than any uint;
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qed");
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trace!(target: "engine", "Multi ValidatorSet retrieved for block {}.", block);
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(*block, &**set)
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}
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}
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impl ValidatorSet for Multi {
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fn default_caller(&self, block_id: BlockId) -> Box<Call> {
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self.correct_set(block_id).map(|set| set.default_caller(block_id))
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.unwrap_or(Box::new(|_, _| Err("No validator set for given ID.".into())))
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}
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fn on_epoch_begin(&self, _first: bool, header: &Header, call: &mut SystemCall) -> Result<(), ::error::Error> {
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let (set_block, set) = self.correct_set_by_number(header.number());
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let first = set_block == header.number();
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set.on_epoch_begin(first, header, call)
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}
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fn genesis_epoch_data(&self, header: &Header, call: &Call) -> Result<Vec<u8>, String> {
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self.correct_set_by_number(0).1.genesis_epoch_data(header, call)
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}
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fn is_epoch_end(&self, _first: bool, chain_head: &Header) -> Option<Vec<u8>> {
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let (set_block, set) = self.correct_set_by_number(chain_head.number());
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let first = set_block == chain_head.number();
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set.is_epoch_end(first, chain_head)
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}
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fn signals_epoch_end(&self, _first: bool, header: &Header, aux: AuxiliaryData)
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-> ::engines::EpochChange<EthereumMachine>
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{
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let (set_block, set) = self.correct_set_by_number(header.number());
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let first = set_block == header.number();
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set.signals_epoch_end(first, header, aux)
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}
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fn epoch_set(&self, _first: bool, machine: &EthereumMachine, number: BlockNumber, proof: &[u8]) -> Result<(super::SimpleList, Option<H256>), ::error::Error> {
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let (set_block, set) = self.correct_set_by_number(number);
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let first = set_block == number;
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set.epoch_set(first, machine, number, proof)
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}
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fn contains_with_caller(&self, bh: &H256, address: &Address, caller: &Call) -> bool {
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self.correct_set(BlockId::Hash(*bh))
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.map_or(false, |set| set.contains_with_caller(bh, address, caller))
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}
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fn get_with_caller(&self, bh: &H256, nonce: usize, caller: &Call) -> Address {
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self.correct_set(BlockId::Hash(*bh))
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.map_or_else(Default::default, |set| set.get_with_caller(bh, nonce, caller))
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}
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fn count_with_caller(&self, bh: &H256, caller: &Call) -> usize {
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self.correct_set(BlockId::Hash(*bh))
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.map_or_else(usize::max_value, |set| set.count_with_caller(bh, caller))
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}
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fn report_malicious(&self, validator: &Address, set_block: BlockNumber, block: BlockNumber, proof: Bytes) {
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self.correct_set_by_number(set_block).1.report_malicious(validator, set_block, block, proof);
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}
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fn report_benign(&self, validator: &Address, set_block: BlockNumber, block: BlockNumber) {
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self.correct_set_by_number(set_block).1.report_benign(validator, set_block, block);
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}
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fn register_client(&self, client: Weak<EngineClient>) {
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for set in self.sets.values() {
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set.register_client(client.clone());
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}
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*self.block_number.write() = Box::new(move |id| client
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.upgrade()
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.ok_or_else(|| "No client!".into())
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.and_then(|c| c.block_number(id).ok_or("Unknown block".into())));
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}
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}
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#[cfg(test)]
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mod tests {
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use std::sync::Arc;
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use std::collections::BTreeMap;
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use hash::keccak;
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use account_provider::AccountProvider;
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use client::BlockChainClient;
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use engines::EpochChange;
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use engines::validator_set::ValidatorSet;
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use ethkey::Secret;
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use header::Header;
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use miner::MinerService;
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use spec::Spec;
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use tests::helpers::{generate_dummy_client_with_spec_and_accounts, generate_dummy_client_with_spec_and_data};
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use types::ids::BlockId;
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use ethereum_types::Address;
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use super::Multi;
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#[test]
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fn uses_current_set() {
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let tap = Arc::new(AccountProvider::transient_provider());
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let s0: Secret = keccak("0").into();
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let v0 = tap.insert_account(s0.clone(), "").unwrap();
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let v1 = tap.insert_account(keccak("1").into(), "").unwrap();
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let client = generate_dummy_client_with_spec_and_accounts(Spec::new_validator_multi, Some(tap));
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client.engine().register_client(Arc::downgrade(&client) as _);
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// Make sure txs go through.
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client.miner().set_gas_floor_target(1_000_000.into());
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// Wrong signer for the first block.
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client.miner().set_engine_signer(v1, "".into()).unwrap();
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client.transact_contract(Default::default(), Default::default()).unwrap();
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::client::EngineClient::update_sealing(&*client);
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assert_eq!(client.chain_info().best_block_number, 0);
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// Right signer for the first block.
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client.miner().set_engine_signer(v0, "".into()).unwrap();
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::client::EngineClient::update_sealing(&*client);
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assert_eq!(client.chain_info().best_block_number, 1);
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// This time v0 is wrong.
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client.transact_contract(Default::default(), Default::default()).unwrap();
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::client::EngineClient::update_sealing(&*client);
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assert_eq!(client.chain_info().best_block_number, 1);
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client.miner().set_engine_signer(v1, "".into()).unwrap();
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::client::EngineClient::update_sealing(&*client);
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assert_eq!(client.chain_info().best_block_number, 2);
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// v1 is still good.
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client.transact_contract(Default::default(), Default::default()).unwrap();
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::client::EngineClient::update_sealing(&*client);
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assert_eq!(client.chain_info().best_block_number, 3);
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// Check syncing.
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let sync_client = generate_dummy_client_with_spec_and_data(Spec::new_validator_multi, 0, 0, &[]);
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sync_client.engine().register_client(Arc::downgrade(&sync_client) as _);
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for i in 1..4 {
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sync_client.import_block(client.block(BlockId::Number(i)).unwrap().into_inner()).unwrap();
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}
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sync_client.flush_queue();
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assert_eq!(sync_client.chain_info().best_block_number, 3);
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}
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#[test]
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fn transition_to_fixed_list_instant() {
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use super::super::SimpleList;
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let mut map: BTreeMap<_, Box<ValidatorSet>> = BTreeMap::new();
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let list1: Vec<_> = (0..10).map(|_| Address::random()).collect();
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let list2 = {
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let mut list = list1.clone();
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list.push(Address::random());
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list
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};
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map.insert(0, Box::new(SimpleList::new(list1)));
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map.insert(500, Box::new(SimpleList::new(list2)));
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let multi = Multi::new(map);
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let mut header = Header::new();
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header.set_number(499);
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match multi.signals_epoch_end(false, &header, Default::default()) {
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EpochChange::No => {},
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_ => panic!("Expected no epoch signal change."),
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}
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assert!(multi.is_epoch_end(false, &header).is_none());
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header.set_number(500);
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match multi.signals_epoch_end(false, &header, Default::default()) {
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EpochChange::No => {},
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_ => panic!("Expected no epoch signal change."),
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}
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assert!(multi.is_epoch_end(false, &header).is_some());
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}
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}
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