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use std::sync::Weak;
use util::*;
use client::{Client, BlockChainClient};
use super::ValidatorSet;
use super::safe_contract::ValidatorSafeContract;
pub struct ValidatorContract {
validators: Arc<ValidatorSafeContract>,
provider: RwLock<Option<provider::Contract>>,
}
impl ValidatorContract {
pub fn new(contract_address: Address) -> Self {
ValidatorContract {
validators: Arc::new(ValidatorSafeContract::new(contract_address)),
provider: RwLock::new(None),
}
}
}
impl ValidatorSet for Arc<ValidatorContract> {
fn contains(&self, address: &Address) -> bool {
self.validators.contains(address)
}
fn get(&self, nonce: usize) -> Address {
self.validators.get(nonce)
}
fn count(&self) -> usize {
self.validators.count()
}
fn report_malicious(&self, address: &Address) {
if let Some(ref provider) = *self.provider.read() {
match provider.report_malicious(address) {
Ok(_) => warn!(target: "engine", "Reported malicious validator {}", address),
Err(s) => warn!(target: "engine", "Validator {} could not be reported {}", address, s),
}
} else {
warn!(target: "engine", "Malicious behaviour could not be reported: no provider contract.")
}
}
fn report_benign(&self, address: &Address) {
if let Some(ref provider) = *self.provider.read() {
match provider.report_benign(address) {
Ok(_) => warn!(target: "engine", "Reported benign validator misbehaviour {}", address),
Err(s) => warn!(target: "engine", "Validator {} could not be reported {}", address, s),
}
} else {
warn!(target: "engine", "Benign misbehaviour could not be reported: no provider contract.")
}
}
fn register_contract(&self, client: Weak<Client>) {
self.validators.register_contract(client.clone());
let transact = move |a, d| client
.upgrade()
.ok_or("No client!".into())
.and_then(|c| c.transact_contract(a, d).map_err(|e| format!("Transaction import error: {}", e)))
.map(|_| Default::default());
*self.provider.write() = Some(provider::Contract::new(self.validators.address, transact));
}
}
mod provider {
#![allow(unused_imports)]
use std::string::String;
use std::result::Result;
use std::fmt;
use {util, ethabi};
use util::{FixedHash, Uint};
pub struct Contract {
contract: ethabi::Contract,
address: util::Address,
do_call: Box<Fn(util::Address, Vec<u8>) -> Result<Vec<u8>, String> + Send + Sync + 'static>,
}
impl Contract {
pub fn new<F>(address: util::Address, do_call: F) -> Self where F: Fn(util::Address, Vec<u8>) -> Result<Vec<u8>, String> + Send + Sync + 'static {
Contract {
contract: ethabi::Contract::new(ethabi::Interface::load(b"[{\"constant\":false,\"inputs\":[{\"name\":\"validator\",\"type\":\"address\"}],\"name\":\"reportMalicious\",\"outputs\":[],\"payable\":false,\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"validator\",\"type\":\"address\"}],\"name\":\"reportBenign\",\"outputs\":[],\"payable\":false,\"type\":\"function\"}]").expect("JSON is autogenerated; qed")),
address: address,
do_call: Box::new(do_call),
}
}
fn as_string<T: fmt::Debug>(e: T) -> String { format!("{:?}", e) }
#[allow(dead_code)]
pub fn report_malicious(&self, validator: &util::Address) -> Result<(), String> {
let call = self.contract.function("reportMalicious".into()).map_err(Self::as_string)?;
let data = call.encode_call(
vec![ethabi::Token::Address(validator.clone().0)]
).map_err(Self::as_string)?;
call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
Ok(())
}
#[allow(dead_code)]
pub fn report_benign(&self, validator: &util::Address) -> Result<(), String> {
let call = self.contract.function("reportBenign".into()).map_err(Self::as_string)?;
let data = call.encode_call(
vec![ethabi::Token::Address(validator.clone().0)]
).map_err(Self::as_string)?;
call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
Ok(())
}
}
}
#[cfg(test)]
mod tests {
use util::*;
use rlp::encode;
use ethkey::Secret;
use spec::Spec;
use header::Header;
use account_provider::AccountProvider;
use miner::MinerService;
use client::BlockChainClient;
use tests::helpers::generate_dummy_client_with_spec_and_accounts;
use super::super::ValidatorSet;
use super::ValidatorContract;
#[test]
fn fetches_validators() {
let client = generate_dummy_client_with_spec_and_accounts(Spec::new_validator_contract, None);
let vc = Arc::new(ValidatorContract::new(Address::from_str("0000000000000000000000000000000000000005").unwrap()));
vc.register_contract(Arc::downgrade(&client));
assert!(vc.contains(&Address::from_str("7d577a597b2742b498cb5cf0c26cdcd726d39e6e").unwrap()));
assert!(vc.contains(&Address::from_str("82a978b3f5962a5b0957d9ee9eef472ee55b42f1").unwrap()));
}
#[test]
fn reports_validators() {
let tap = Arc::new(AccountProvider::transient_provider());
let v1 = tap.insert_account(Secret::from_slice(&"1".sha3()).unwrap(), "").unwrap();
let client = generate_dummy_client_with_spec_and_accounts(Spec::new_validator_contract, Some(tap.clone()));
client.engine().register_client(Arc::downgrade(&client));
let validator_contract = Address::from_str("0000000000000000000000000000000000000005").unwrap();
client.miner().set_gas_floor_target(1_000_000.into());
client.miner().set_engine_signer(v1, "".into()).unwrap();
let mut header = Header::default();
let seal = encode(&vec!(5u8)).to_vec();
header.set_seal(vec!(seal));
header.set_author(v1);
header.set_number(1);
assert!(client.engine().verify_block_unordered(&header, None).is_err());
client.engine().step();
assert_eq!(client.chain_info().best_block_number, 1);
assert_eq!(client.call_contract(validator_contract, "d8f2e0bf".from_hex().unwrap()).unwrap().to_hex(), "0000000000000000000000007d577a597b2742b498cb5cf0c26cdcd726d39e6e");
assert!(client.engine().verify_block_family(&header, &header, None).is_err());
client.engine().step();
client.engine().step();
assert_eq!(client.chain_info().best_block_number, 2);
client.transact_contract(Default::default(), Default::default()).unwrap();
client.engine().step();
client.engine().step();
assert_eq!(client.chain_info().best_block_number, 2);
}
}