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use std::sync::Weak;
use util::*;
use client::{Client, BlockChainClient};
use client::chain_notify::ChainNotify;
use super::ValidatorSet;
use super::simple_list::SimpleList;
pub struct ValidatorSafeContract {
pub address: Address,
validators: RwLock<SimpleList>,
provider: RwLock<Option<provider::Contract>>,
}
impl ValidatorSafeContract {
pub fn new(contract_address: Address) -> Self {
ValidatorSafeContract {
address: contract_address,
validators: Default::default(),
provider: RwLock::new(None),
}
}
pub fn update(&self) {
if let Some(ref provider) = *self.provider.read() {
match provider.get_validators() {
Ok(new) => {
debug!(target: "engine", "Set of validators obtained: {:?}", new);
*self.validators.write() = SimpleList::new(new);
},
Err(s) => warn!(target: "engine", "Set of validators could not be updated: {}", s),
}
} else {
warn!(target: "engine", "Set of validators could not be updated: no provider contract.")
}
}
}
impl ChainNotify for ValidatorSafeContract {
fn new_blocks(
&self,
_: Vec<H256>,
_: Vec<H256>,
enacted: Vec<H256>,
_: Vec<H256>,
_: Vec<H256>,
_: Vec<Bytes>,
_duration: u64) {
if !enacted.is_empty() {
self.update();
}
}
}
impl ValidatorSet for Arc<ValidatorSafeContract> {
fn contains(&self, address: &Address) -> bool {
self.validators.read().contains(address)
}
fn get(&self, nonce: usize) -> Address {
self.validators.read().get(nonce)
}
fn count(&self) -> usize {
self.validators.read().count()
}
fn register_contract(&self, client: Weak<Client>) {
if let Some(c) = client.upgrade() {
c.add_notify(self.clone());
}
{
*self.provider.write() = Some(provider::Contract::new(self.address, move |a, d| client.upgrade().ok_or("No client!".into()).and_then(|c| c.call_contract(a, d))));
}
self.update();
}
}
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\":true,\"inputs\":[],\"name\":\"getValidators\",\"outputs\":[{\"name\":\"\",\"type\":\"address[]\"}],\"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 get_validators(&self) -> Result<Vec<util::Address>, String> {
let call = self.contract.function("getValidators".into()).map_err(Self::as_string)?;
let data = call.encode_call(
vec![]
).map_err(Self::as_string)?;
let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
let mut result = output.into_iter().rev().collect::<Vec<_>>();
Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_array().and_then(|v| v.into_iter().map(|a| a.to_address()).collect::<Option<Vec<[u8; 20]>>>()).ok_or("Invalid type returned")?; r.into_iter().map(|a| util::Address::from(a)).collect::<Vec<_>>() }))
}
}
}
#[cfg(test)]
mod tests {
use util::*;
use spec::Spec;
use account_provider::AccountProvider;
use transaction::{Transaction, Action};
use client::{BlockChainClient, EngineClient};
use ethkey::Secret;
use miner::MinerService;
use tests::helpers::generate_dummy_client_with_spec_and_accounts;
use super::super::ValidatorSet;
use super::ValidatorSafeContract;
#[test]
fn fetches_validators() {
let client = generate_dummy_client_with_spec_and_accounts(Spec::new_validator_safe_contract, None);
let vc = Arc::new(ValidatorSafeContract::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 updates_validators() {
let tap = Arc::new(AccountProvider::transient_provider());
let s0 = Secret::from_slice(&"1".sha3()).unwrap();
let v0 = tap.insert_account(s0.clone(), "").unwrap();
let v1 = tap.insert_account(Secret::from_slice(&"0".sha3()).unwrap(), "").unwrap();
let client = generate_dummy_client_with_spec_and_accounts(Spec::new_validator_safe_contract, Some(tap));
client.engine().register_client(Arc::downgrade(&client));
let validator_contract = Address::from_str("0000000000000000000000000000000000000005").unwrap();
client.miner().set_engine_signer(v1, "".into()).unwrap();
let tx = Transaction {
nonce: 0.into(),
gas_price: 0.into(),
gas: 500_000.into(),
action: Action::Call(validator_contract),
value: 0.into(),
data: "bfc708a000000000000000000000000082a978b3f5962a5b0957d9ee9eef472ee55b42f1".from_hex().unwrap(),
}.sign(&s0, None);
client.miner().import_own_transaction(client.as_ref(), tx.into()).unwrap();
client.update_sealing();
assert_eq!(client.chain_info().best_block_number, 1);
let tx = Transaction {
nonce: 1.into(),
gas_price: 0.into(),
gas: 500_000.into(),
action: Action::Call(validator_contract),
value: 0.into(),
data: "4d238c8e00000000000000000000000082a978b3f5962a5b0957d9ee9eef472ee55b42f1".from_hex().unwrap(),
}.sign(&s0, None);
client.miner().import_own_transaction(client.as_ref(), tx.into()).unwrap();
client.update_sealing();
assert_eq!(client.chain_info().best_block_number, 1);
client.miner().set_engine_signer(v0, "".into()).unwrap();
client.update_sealing();
assert_eq!(client.chain_info().best_block_number, 2);
client.miner().set_engine_signer(v1, "".into()).unwrap();
let tx = Transaction {
nonce: 2.into(),
gas_price: 0.into(),
gas: 21000.into(),
action: Action::Call(Address::default()),
value: 0.into(),
data: Vec::new(),
}.sign(&s0, None);
client.miner().import_own_transaction(client.as_ref(), tx.into()).unwrap();
client.update_sealing();
assert_eq!(client.chain_info().best_block_number, 3);
}
}