a0f406e26b
* Upgrade Eth types ethereum-types -> 0.9.2 rlp -> 0.4.6 keccak-hash -> 0.5.0 parity-crypto -> 0.6.2 ethabi -> 0.12.0 ethabi-derive -> 0.12.0 ethabi-contract -> 0.11.0 ethbloom -> 0.9.1 rand -> 0.7.3 trie-standardmap -> 0.15.2 triehash -> 0.5.0 * backport #10714. Small changes, merge fixes Co-authored-by: mdben1247 <mdben1247@users.noreply.github.com>
677 lines
24 KiB
Rust
677 lines
24 KiB
Rust
// Copyright 2015-2020 Parity Technologies (UK) Ltd.
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// This file is part of OpenEthereum.
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// OpenEthereum 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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// OpenEthereum 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 OpenEthereum. If not, see <http://www.gnu.org/licenses/>.
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/// Validator set maintained in a contract, updated using `getValidators` method.
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use std::sync::{Arc, Weak};
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use bytes::Bytes;
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use ethabi::FunctionOutputDecoder;
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use ethereum_types::{Address, Bloom, H256, U256};
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use hash::keccak;
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use kvdb::DBValue;
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use memory_cache::MemoryLruCache;
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use parking_lot::RwLock;
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use rlp::{Rlp, RlpStream};
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use types::{header::Header, ids::BlockId, log_entry::LogEntry, receipt::TypedReceipt};
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use unexpected::Mismatch;
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use super::{simple_list::SimpleList, SystemCall, ValidatorSet};
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use client::EngineClient;
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use machine::{AuxiliaryData, AuxiliaryRequest, Call, EthereumMachine};
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use_contract!(validator_set, "res/contracts/validator_set.json");
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const MEMOIZE_CAPACITY: usize = 500;
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// TODO: ethabi should be able to generate this.
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const EVENT_NAME: &'static [u8] = &*b"InitiateChange(bytes32,address[])";
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lazy_static! {
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static ref EVENT_NAME_HASH: H256 = keccak(EVENT_NAME);
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}
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// state-dependent proofs for the safe contract:
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// only "first" proofs are such.
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struct StateProof {
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contract_address: Address,
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header: Header,
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}
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impl ::engines::StateDependentProof<EthereumMachine> for StateProof {
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fn generate_proof(&self, caller: &Call) -> Result<Vec<u8>, String> {
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prove_initial(self.contract_address, &self.header, caller)
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}
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fn check_proof(&self, machine: &EthereumMachine, proof: &[u8]) -> Result<(), String> {
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let (header, state_items) = decode_first_proof(&Rlp::new(proof))
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.map_err(|e| format!("proof incorrectly encoded: {}", e))?;
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if &header != &self.header {
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return Err("wrong header in proof".into());
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}
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check_first_proof(machine, self.contract_address, header, &state_items).map(|_| ())
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}
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}
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/// The validator contract should have the following interface:
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pub struct ValidatorSafeContract {
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contract_address: Address,
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validators: RwLock<MemoryLruCache<H256, SimpleList>>,
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client: RwLock<Option<Weak<dyn EngineClient>>>, // TODO [keorn]: remove
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}
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// first proof is just a state proof call of `getValidators` at header's state.
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fn encode_first_proof(header: &Header, state_items: &[Vec<u8>]) -> Bytes {
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let mut stream = RlpStream::new_list(2);
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stream.append(header).begin_list(state_items.len());
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for item in state_items {
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stream.append(item);
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}
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stream.out()
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}
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// check a first proof: fetch the validator set at the given block.
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fn check_first_proof(
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machine: &EthereumMachine,
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contract_address: Address,
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old_header: Header,
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state_items: &[DBValue],
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) -> Result<Vec<Address>, String> {
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use types::transaction::{Action, Transaction, TypedTransaction};
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// TODO: match client contract_call_tx more cleanly without duplication.
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const PROVIDED_GAS: u64 = 50_000_000;
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let env_info = ::vm::EnvInfo {
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number: old_header.number(),
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author: *old_header.author(),
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difficulty: *old_header.difficulty(),
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gas_limit: PROVIDED_GAS.into(),
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timestamp: old_header.timestamp(),
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last_hashes: {
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// this will break if we don't inclue all 256 last hashes.
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let mut last_hashes: Vec<_> = (0..256).map(|_| H256::default()).collect();
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last_hashes[255] = *old_header.parent_hash();
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Arc::new(last_hashes)
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},
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gas_used: 0.into(),
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};
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// check state proof using given machine.
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let number = old_header.number();
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let (data, decoder) = validator_set::functions::get_validators::call();
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let from = Address::default();
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let tx = TypedTransaction::Legacy(Transaction {
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nonce: machine.account_start_nonce(number),
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action: Action::Call(contract_address),
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gas: PROVIDED_GAS.into(),
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gas_price: U256::default(),
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value: U256::default(),
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data,
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})
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.fake_sign(from);
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let res = ::state::check_proof(
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state_items,
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*old_header.state_root(),
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&tx,
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machine,
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&env_info,
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);
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match res {
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::state::ProvedExecution::BadProof => Err("Bad proof".into()),
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::state::ProvedExecution::Failed(e) => Err(format!("Failed call: {}", e)),
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::state::ProvedExecution::Complete(e) => {
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decoder.decode(&e.output).map_err(|e| e.to_string())
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}
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}
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}
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fn decode_first_proof(rlp: &Rlp) -> Result<(Header, Vec<DBValue>), ::error::Error> {
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let header = rlp.val_at(0)?;
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let state_items = rlp
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.at(1)?
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.iter()
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.map(|x| {
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let mut val = DBValue::new();
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val.append_slice(x.data()?);
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Ok(val)
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})
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.collect::<Result<_, ::error::Error>>()?;
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Ok((header, state_items))
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}
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// inter-contract proofs are a header and receipts.
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// checking will involve ensuring that the receipts match the header and
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// extracting the validator set from the receipts.
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fn encode_proof(header: &Header, receipts: &[TypedReceipt]) -> Bytes {
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let mut stream = RlpStream::new_list(2);
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stream.append(header);
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TypedReceipt::rlp_append_list(&mut stream, receipts);
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stream.drain()
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}
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fn decode_proof(rlp: &Rlp) -> Result<(Header, Vec<TypedReceipt>), ::error::Error> {
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Ok((rlp.val_at(0)?, TypedReceipt::decode_rlp_list(&rlp.at(1)?)?))
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}
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// given a provider and caller, generate proof. this will just be a state proof
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// of `getValidators`.
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fn prove_initial(
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contract_address: Address,
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header: &Header,
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caller: &Call,
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) -> Result<Vec<u8>, String> {
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use std::cell::RefCell;
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let epoch_proof = RefCell::new(None);
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let validators = {
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let (data, decoder) = validator_set::functions::get_validators::call();
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let (value, proof) = caller(contract_address, data)?;
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*epoch_proof.borrow_mut() = Some(encode_first_proof(header, &proof));
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decoder.decode(&value).map_err(|e| e.to_string())?
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};
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let proof = epoch_proof
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.into_inner()
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.expect("epoch_proof always set after call; qed");
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trace!(target: "engine", "obtained proof for initial set: {} validators, {} bytes",
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validators.len(), proof.len());
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info!(target: "engine", "Signal for switch to contract-based validator set.");
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info!(target: "engine", "Initial contract validators: {:?}", validators);
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Ok(proof)
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}
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impl ValidatorSafeContract {
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pub fn new(contract_address: Address) -> Self {
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ValidatorSafeContract {
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contract_address,
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validators: RwLock::new(MemoryLruCache::new(MEMOIZE_CAPACITY)),
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client: RwLock::new(None),
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}
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}
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/// Queries the state and gets the set of validators.
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fn get_list(&self, caller: &Call) -> Option<SimpleList> {
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let contract_address = self.contract_address;
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let (data, decoder) = validator_set::functions::get_validators::call();
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let value = caller(contract_address, data)
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.and_then(|x| decoder.decode(&x.0).map_err(|e| e.to_string()));
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match value {
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Ok(new) => {
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debug!(target: "engine", "Set of validators obtained: {:?}", new);
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Some(SimpleList::new(new))
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}
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Err(s) => {
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debug!(target: "engine", "Set of validators could not be updated: {}", s);
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None
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}
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}
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}
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// Whether the header matches the expected bloom.
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//
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// The expected log should have 3 topics:
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// 1. ETHABI-encoded log name.
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// 2. the block's parent hash.
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// 3. the "nonce": n for the nth transition in history.
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//
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// We can only search for the first 2, since we don't have the third
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// just yet.
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//
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// The parent hash is included to prevent
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// malicious actors from brute forcing other logs that would
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// produce the same bloom.
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//
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// The log data is an array of all new validator addresses.
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fn expected_bloom(&self, header: &Header) -> Bloom {
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let topics = vec![*EVENT_NAME_HASH, *header.parent_hash()];
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debug!(target: "engine", "Expected topics for header {}: {:?}",
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header.hash(), topics);
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LogEntry {
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address: self.contract_address,
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topics: topics,
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data: Vec::new(), // irrelevant for bloom.
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}
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.bloom()
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}
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// check receipts for log event. bloom should be `expected_bloom` for the
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// header the receipts correspond to.
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fn extract_from_event(
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&self,
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bloom: Bloom,
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header: &Header,
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receipts: &[TypedReceipt],
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) -> Option<SimpleList> {
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let check_log = |log: &LogEntry| {
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log.address == self.contract_address
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&& log.topics.len() == 2
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&& log.topics[0] == *EVENT_NAME_HASH
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&& log.topics[1] == *header.parent_hash()
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};
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//// iterate in reverse because only the _last_ change in a given
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//// block actually has any effect.
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//// the contract should only increment the nonce once.
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let mut decoded_events = receipts
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.iter()
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.rev()
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.filter(|r| r.log_bloom.contains_bloom(&bloom))
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.flat_map(|r| r.logs.iter())
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.filter(move |l| check_log(l))
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.filter_map(|log| {
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validator_set::events::initiate_change::parse_log(
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(log.topics.clone(), log.data.clone()).into(),
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)
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.ok()
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});
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// only last log is taken into account
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decoded_events
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.next()
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.map(|matched_event| SimpleList::new(matched_event.new_set))
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}
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}
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impl ValidatorSet for ValidatorSafeContract {
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fn default_caller(&self, id: BlockId) -> Box<Call> {
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let client = self.client.read().clone();
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Box::new(move |addr, data| {
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client
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.as_ref()
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.and_then(Weak::upgrade)
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.ok_or_else(|| "No client!".into())
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.and_then(|c| match c.as_full_client() {
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Some(c) => c.call_contract(id, addr, data),
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None => Err("No full client!".into()),
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})
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.map(|out| (out, Vec::new()))
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}) // generate no proofs in general
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}
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fn on_epoch_begin(
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&self,
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_first: bool,
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_header: &Header,
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caller: &mut SystemCall,
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) -> Result<(), ::error::Error> {
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let data = validator_set::functions::finalize_change::encode_input();
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caller(self.contract_address, data)
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.map(|_| ())
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.map_err(::engines::EngineError::FailedSystemCall)
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.map_err(Into::into)
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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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prove_initial(self.contract_address, 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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None // no immediate transitions to contract.
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}
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fn signals_epoch_end(
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&self,
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first: bool,
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header: &Header,
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aux: AuxiliaryData,
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) -> ::engines::EpochChange<EthereumMachine> {
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let receipts = aux.receipts;
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// transition to the first block of a contract requires finality but has no log event.
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if first {
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debug!(target: "engine", "signalling transition to fresh contract.");
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let state_proof = Arc::new(StateProof {
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contract_address: self.contract_address,
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header: header.clone(),
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});
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return ::engines::EpochChange::Yes(::engines::Proof::WithState(state_proof as Arc<_>));
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}
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// otherwise, we're checking for logs.
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let bloom = self.expected_bloom(header);
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let header_bloom = header.log_bloom();
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if &bloom & header_bloom != bloom {
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return ::engines::EpochChange::No;
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}
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trace!(target: "engine", "detected epoch change event bloom");
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match receipts {
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None => ::engines::EpochChange::Unsure(AuxiliaryRequest::Receipts),
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Some(receipts) => match self.extract_from_event(bloom, header, receipts) {
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None => ::engines::EpochChange::No,
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Some(list) => {
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info!(target: "engine", "Signal for transition within contract. New list: {:?}",
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&*list);
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let proof = encode_proof(&header, receipts);
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::engines::EpochChange::Yes(::engines::Proof::Known(proof))
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}
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},
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}
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}
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fn epoch_set(
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&self,
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first: bool,
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machine: &EthereumMachine,
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_number: ::types::BlockNumber,
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proof: &[u8],
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) -> Result<(SimpleList, Option<H256>), ::error::Error> {
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let rlp = Rlp::new(proof);
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if first {
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trace!(target: "engine", "Recovering initial epoch set");
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let (old_header, state_items) = decode_first_proof(&rlp)?;
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let number = old_header.number();
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let old_hash = old_header.hash();
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let addresses =
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check_first_proof(machine, self.contract_address, old_header, &state_items)
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.map_err(::engines::EngineError::InsufficientProof)?;
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trace!(target: "engine", "extracted epoch set at #{}: {} addresses",
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number, addresses.len());
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Ok((SimpleList::new(addresses), Some(old_hash)))
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} else {
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let (old_header, receipts) = decode_proof(&rlp)?;
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// ensure receipts match header.
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// TODO: optimize? these were just decoded.
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let found_root = ::triehash::ordered_trie_root(receipts.iter().map(|r| r.encode()));
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if found_root != *old_header.receipts_root() {
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return Err(::error::BlockError::InvalidReceiptsRoot(Mismatch {
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expected: *old_header.receipts_root(),
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found: found_root,
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})
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.into());
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}
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let bloom = self.expected_bloom(&old_header);
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match self.extract_from_event(bloom, &old_header, &receipts) {
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Some(list) => Ok((list, Some(old_header.hash()))),
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None => Err(::engines::EngineError::InsufficientProof(
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"No log event in proof.".into(),
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)
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.into()),
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}
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}
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}
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fn contains_with_caller(&self, block_hash: &H256, address: &Address, caller: &Call) -> bool {
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let mut guard = self.validators.write();
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let maybe_existing = guard
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.get_mut(block_hash)
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.map(|list| list.contains(block_hash, address));
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maybe_existing.unwrap_or_else(|| {
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self.get_list(caller).map_or(false, |list| {
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let contains = list.contains(block_hash, address);
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guard.insert(block_hash.clone(), list);
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contains
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})
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})
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}
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fn get_with_caller(&self, block_hash: &H256, nonce: usize, caller: &Call) -> Address {
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let mut guard = self.validators.write();
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let maybe_existing = guard
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.get_mut(block_hash)
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.map(|list| list.get(block_hash, nonce));
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maybe_existing.unwrap_or_else(|| {
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self.get_list(caller).map_or_else(Default::default, |list| {
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let address = list.get(block_hash, nonce);
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guard.insert(block_hash.clone(), list);
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address
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})
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})
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}
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fn count_with_caller(&self, block_hash: &H256, caller: &Call) -> usize {
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let mut guard = self.validators.write();
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let maybe_existing = guard.get_mut(block_hash).map(|list| list.count(block_hash));
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maybe_existing.unwrap_or_else(|| {
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self.get_list(caller).map_or_else(usize::max_value, |list| {
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let address = list.count(block_hash);
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guard.insert(block_hash.clone(), list);
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address
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})
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})
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}
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fn register_client(&self, client: Weak<dyn EngineClient>) {
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trace!(target: "engine", "Setting up contract caller.");
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*self.client.write() = Some(client);
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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 super::{super::ValidatorSet, ValidatorSafeContract, EVENT_NAME_HASH};
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use accounts::AccountProvider;
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use client::{
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traits::{EngineClient, ForceUpdateSealing},
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BlockInfo, ChainInfo, ImportBlock,
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};
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use crypto::publickey::Secret;
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use ethereum_types::Address;
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use hash::keccak;
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use miner::{self, MinerService};
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use rustc_hex::FromHex;
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use spec::Spec;
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use std::sync::Arc;
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use test_helpers::{generate_dummy_client_with_spec, generate_dummy_client_with_spec_and_data};
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use types::{
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ids::BlockId,
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transaction::{Action, Transaction, TypedTransaction},
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};
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use verification::queue::kind::blocks::Unverified;
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#[test]
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fn fetches_validators() {
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let client = generate_dummy_client_with_spec(Spec::new_validator_safe_contract);
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let vc = Arc::new(ValidatorSafeContract::new(
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"0000000000000000000000000000000000000005"
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.parse::<Address>()
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.unwrap(),
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));
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vc.register_client(Arc::downgrade(&client) as _);
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let last_hash = client.best_block_header().hash();
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assert!(vc.contains(
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&last_hash,
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&"7d577a597b2742b498cb5cf0c26cdcd726d39e6e"
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.parse::<Address>()
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.unwrap()
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));
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assert!(vc.contains(
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&last_hash,
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&"82a978b3f5962a5b0957d9ee9eef472ee55b42f1"
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.parse::<Address>()
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.unwrap()
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));
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}
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#[test]
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fn knows_validators() {
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let tap = Arc::new(AccountProvider::transient_provider());
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let s0: Secret = keccak("1").into();
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let v0 = tap.insert_account(s0.clone(), &"".into()).unwrap();
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let v1 = tap.insert_account(keccak("0").into(), &"".into()).unwrap();
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let chain_id = Spec::new_validator_safe_contract().chain_id();
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let client = generate_dummy_client_with_spec(Spec::new_validator_safe_contract);
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client
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.engine()
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.register_client(Arc::downgrade(&client) as _);
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let validator_contract = "0000000000000000000000000000000000000005"
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.parse::<Address>()
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.unwrap();
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let signer = Box::new((tap.clone(), v1, "".into()));
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client.miner().set_author(miner::Author::Sealer(signer));
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// Remove "1" validator.
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let tx = TypedTransaction::Legacy(Transaction {
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nonce: 0.into(),
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gas_price: 0.into(),
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gas: 500_000.into(),
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action: Action::Call(validator_contract),
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value: 0.into(),
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data: "bfc708a000000000000000000000000082a978b3f5962a5b0957d9ee9eef472ee55b42f1"
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.from_hex()
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.unwrap(),
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})
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.sign(&s0, Some(chain_id));
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client
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.miner()
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.import_own_transaction(client.as_ref(), tx.into())
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.unwrap();
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EngineClient::update_sealing(&*client, ForceUpdateSealing::No);
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assert_eq!(client.chain_info().best_block_number, 1);
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// Add "1" validator back in.
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let tx = TypedTransaction::Legacy(Transaction {
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nonce: 1.into(),
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gas_price: 0.into(),
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gas: 500_000.into(),
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action: Action::Call(validator_contract),
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value: 0.into(),
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data: "4d238c8e00000000000000000000000082a978b3f5962a5b0957d9ee9eef472ee55b42f1"
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.from_hex()
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.unwrap(),
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})
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.sign(&s0, Some(chain_id));
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client
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.miner()
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.import_own_transaction(client.as_ref(), tx.into())
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.unwrap();
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EngineClient::update_sealing(&*client, ForceUpdateSealing::No);
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// The transaction is not yet included so still unable to seal.
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assert_eq!(client.chain_info().best_block_number, 1);
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// Switch to the validator that is still there.
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let signer = Box::new((tap.clone(), v0, "".into()));
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client.miner().set_author(miner::Author::Sealer(signer));
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EngineClient::update_sealing(&*client, ForceUpdateSealing::No);
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assert_eq!(client.chain_info().best_block_number, 2);
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// Switch back to the added validator, since the state is updated.
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let signer = Box::new((tap.clone(), v1, "".into()));
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client.miner().set_author(miner::Author::Sealer(signer));
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let tx = TypedTransaction::Legacy(Transaction {
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nonce: 2.into(),
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gas_price: 0.into(),
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gas: 21000.into(),
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action: Action::Call(Address::default()),
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value: 0.into(),
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data: Vec::new(),
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})
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.sign(&s0, Some(chain_id));
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client
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.miner()
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.import_own_transaction(client.as_ref(), tx.into())
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.unwrap();
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EngineClient::update_sealing(&*client, ForceUpdateSealing::No);
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// Able to seal again.
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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 =
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generate_dummy_client_with_spec_and_data(Spec::new_validator_safe_contract, 0, 0, &[]);
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sync_client
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.engine()
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.register_client(Arc::downgrade(&sync_client) as _);
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for i in 1..4 {
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sync_client
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.import_block(
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Unverified::from_rlp(client.block(BlockId::Number(i)).unwrap().into_inner())
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.unwrap(),
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)
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.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 detects_bloom() {
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use engines::EpochChange;
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use machine::AuxiliaryRequest;
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use types::{header::Header, log_entry::LogEntry};
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let client = generate_dummy_client_with_spec(Spec::new_validator_safe_contract);
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let engine = client.engine().clone();
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let validator_contract = "0000000000000000000000000000000000000005"
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.parse::<Address>()
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.unwrap();
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let last_hash = client.best_block_header().hash();
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let mut new_header = Header::default();
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new_header.set_parent_hash(last_hash);
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new_header.set_number(1); // so the validator set looks for a log.
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// first, try without the parent hash.
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let mut event = LogEntry {
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address: validator_contract,
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topics: vec![*EVENT_NAME_HASH],
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data: Vec::new(),
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};
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new_header.set_log_bloom(event.bloom());
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match engine.signals_epoch_end(&new_header, Default::default()) {
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EpochChange::No => {}
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_ => panic!("Expected bloom to be unrecognized."),
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};
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// with the last hash, it should need the receipts.
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event.topics.push(last_hash);
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new_header.set_log_bloom(event.bloom());
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match engine.signals_epoch_end(&new_header, Default::default()) {
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EpochChange::Unsure(AuxiliaryRequest::Receipts) => {}
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_ => panic!("Expected bloom to be recognized."),
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};
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}
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#[test]
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fn initial_contract_is_signal() {
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use engines::{EpochChange, Proof};
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use types::header::Header;
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let client = generate_dummy_client_with_spec(Spec::new_validator_safe_contract);
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let engine = client.engine().clone();
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let mut new_header = Header::default();
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new_header.set_number(0); // so the validator set doesn't look for a log
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match engine.signals_epoch_end(&new_header, Default::default()) {
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EpochChange::Yes(Proof::WithState(_)) => {}
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_ => panic!("Expected state to be required to prove initial signal"),
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};
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}
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}
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