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use native contracts in ValidatorSet

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This commit is contained in:
Robert Habermeier 2017-04-12 16:15:35 +02:00
parent 2f5a774325
commit 0f80c57dca
5 changed files with 107 additions and 145 deletions
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8
ethcore/native_contracts/generator/src/lib.rs
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@ -46,7 +46,7 @@ pub fn generate_module(struct_name: &str, abi: &str) -> Result<String, Error> {
Ok(format!(r##"
use byteorder::{{BigEndian, ByteOrder}};
use futures::{{future, Future, BoxFuture}};
use futures::{{future, Future, IntoFuture, BoxFuture}};
use ethabi::{{Contract, Interface, Token}};
use util::{{self, Uint}};
@ -99,7 +99,10 @@ fn generate_functions(contract: &Contract) -> Result<String, Error> {
/// Inputs: {abi_inputs:?}
/// Outputs: {abi_outputs:?}
pub fn {snake_name}<F, U>(&self, call: F, {params}) -> BoxFuture<{output_type}, String>
where F: Fn(util::Address, Vec<u8>) -> U, U: Future<Item=Vec<u8>, Error=String> + Send + 'static
where
F: Fn(util::Address, Vec<u8>) -> U,
U: IntoFuture<Item=Vec<u8>, Error=String>,
U::Future: Send + 'static
{{
let function = self.contract.function(r#"{abi_name}"#.to_string())
.expect("function existence checked at compile-time; qed");
@ -111,6 +114,7 @@ pub fn {snake_name}<F, U>(&self, call: F, {params}) -> BoxFuture<{output_type},
}};
call_future
.into_future()
.and_then(move |out| function.decode_output(out).map_err(|e| format!("{{:?}}", e)))
.map(::std::collections::VecDeque::from)
.and_then(|mut outputs| {decode_outputs})

22
ethcore/native_contracts/src/validator_report.rs Normal file
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@ -0,0 +1,22 @@
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
#![allow(unused_mut, unused_variables, unused_imports)]
//! Validator reporting.
// TODO: testing.
include!(concat!(env!("OUT_DIR"), "/validator_report.rs"));

22
ethcore/native_contracts/src/validator_set.rs Normal file
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@ -0,0 +1,22 @@
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
#![allow(unused_mut, unused_variables, unused_imports)]
//! Validator set contract.
// TODO: testing.
include!(concat!(env!("OUT_DIR"), "/validator_set.rs"));

104
ethcore/src/engines/validator_set/contract.rs
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@ -18,27 +18,46 @@
/// It can also report validators for misbehaviour with two levels: `reportMalicious` and `reportBenign`.
use std::sync::Weak;
use futures::Future;
use util::*;
use client::{Client, BlockChainClient};
use native_contracts::ValidatorReport as Provider;
use super::ValidatorSet;
use super::safe_contract::ValidatorSafeContract;
/// The validator contract should have the following interface:
/// [{"constant":true,"inputs":[],"name":"getValidators","outputs":[{"name":"","type":"address[]"}],"payable":false,"type":"function"}]
/// A validator contract with reporting.
pub struct ValidatorContract {
validators: ValidatorSafeContract,
provider: RwLock<Option<provider::Contract>>,
provider: Provider,
client: RwLock<Option<Weak<Client>>>, // TODO [keorn]: remove
}
impl ValidatorContract {
pub fn new(contract_address: Address) -> Self {
ValidatorContract {
validators: ValidatorSafeContract::new(contract_address),
provider: RwLock::new(None),
provider: Provider::new(contract_address),
client: RwLock::new(None),
}
}
}
impl ValidatorContract {
// could be `impl Trait`.
// note: dispatches transactions to network as well as execute.
// TODO [keorn]: Make more general.
fn transact(&self) -> Box<Fn(Address, Vec<u8>) -> Result<Vec<u8>, String>> {
let client = self.client.read().clone();
Box::new(move |a, d| client.as_ref()
.and_then(Weak::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()))
}
}
impl ValidatorSet for ValidatorContract {
fn contains(&self, bh: &H256, address: &Address) -> bool {
self.validators.contains(bh, address)
@ -53,85 +72,22 @@ impl ValidatorSet for ValidatorContract {
}
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.")
match self.provider.report_malicious(&*self.transact(), *address).wait() {
Ok(_) => warn!(target: "engine", "Reported malicious validator {}", address),
Err(s) => warn!(target: "engine", "Validator {} could not be reported {}", address, s),
}
}
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.")
match self.provider.report_benign(&*self.transact(), *address).wait() {
Ok(_) => warn!(target: "engine", "Reported benign validator misbehaviour {}", address),
Err(s) => warn!(target: "engine", "Validator {} could not be reported {}", address, s),
}
}
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 {
// Autogenerated from JSON contract definition using Rust contract convertor.
#![allow(unused_imports)]
use std::string::String;
use std::result::Result;
use std::fmt;
use {util, ethabi};
use util::{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) }
/// Auto-generated from: `{"constant":false,"inputs":[{"name":"validator","type":"address"}],"name":"reportMalicious","outputs":[],"payable":false,"type":"function"}`
#[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(())
}
/// Auto-generated from: `{"constant":false,"inputs":[{"name":"validator","type":"address"}],"name":"reportBenign","outputs":[],"payable":false,"type":"function"}`
#[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(())
}
*self.client.write() = Some(client);
}
}

96
ethcore/src/engines/validator_set/safe_contract.rs
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@ -17,24 +17,26 @@
/// Validator set maintained in a contract, updated using `getValidators` method.
use std::sync::Weak;
use ethabi;
use futures::Future;
use native_contracts::ValidatorSet as Provider;
use util::*;
use util::cache::MemoryLruCache;
use types::ids::BlockId;
use client::{Client, BlockChainClient};
use super::ValidatorSet;
use super::simple_list::SimpleList;
const MEMOIZE_CAPACITY: usize = 500;
const CONTRACT_INTERFACE: &'static [u8] = b"[{\"constant\":true,\"inputs\":[],\"name\":\"getValidators\",\"outputs\":[{\"name\":\"\",\"type\":\"address[]\"}],\"payable\":false,\"type\":\"function\"}]";
const GET_VALIDATORS: &'static str = "getValidators";
/// The validator contract should have the following interface:
/// [{"constant":true,"inputs":[],"name":"getValidators","outputs":[{"name":"","type":"address[]"}],"payable":false,"type":"function"}]
pub struct ValidatorSafeContract {
pub address: Address,
validators: RwLock<MemoryLruCache<H256, SimpleList>>,
provider: RwLock<Option<provider::Contract>>,
provider: Provider,
client: RwLock<Option<Weak<Client>>>, // TODO [keorn]: remove
}
impl ValidatorSafeContract {
@ -42,26 +44,30 @@ impl ValidatorSafeContract {
ValidatorSafeContract {
address: contract_address,
validators: RwLock::new(MemoryLruCache::new(MEMOIZE_CAPACITY)),
provider: RwLock::new(None),
provider: Provider::new(contract_address),
client: RwLock::new(None),
}
}
fn do_call(&self, id: BlockId) -> Box<Fn(Address, Vec<u8>) -> Result<Vec<u8>, String>> {
let client = self.client.read().clone();
Box::new(move |addr, data| client.as_ref()
.and_then(Weak::upgrade)
.ok_or("No client!".into())
.and_then(|c| c.call_contract(id, addr, data)))
}
/// Queries the state and gets the set of validators.
fn get_list(&self, block_hash: H256) -> Option<SimpleList> {
if let Some(ref provider) = *self.provider.read() {
match provider.get_validators(BlockId::Hash(block_hash)) {
Ok(new) => {
debug!(target: "engine", "Set of validators obtained: {:?}", new);
Some(SimpleList::new(new))
},
Err(s) => {
debug!(target: "engine", "Set of validators could not be updated: {}", s);
None
},
}
} else {
warn!(target: "engine", "Set of validators could not be updated: no provider contract.");
None
match self.provider.get_validators(&*self.do_call(BlockId::Hash(block_hash))).wait() {
Ok(new) => {
debug!(target: "engine", "Set of validators obtained: {:?}", new);
Some(SimpleList::new(new))
},
Err(s) => {
debug!(target: "engine", "Set of validators could not be updated: {}", s);
None
},
}
}
}
@ -114,55 +120,7 @@ impl ValidatorSet for ValidatorSafeContract {
fn register_contract(&self, client: Weak<Client>) {
trace!(target: "engine", "Setting up contract caller.");
let contract = ethabi::Contract::new(ethabi::Interface::load(CONTRACT_INTERFACE).expect("JSON interface is valid; qed"));
let call = contract.function(GET_VALIDATORS.into()).expect("Method name is valid; qed");
let data = call.encode_call(vec![]).expect("get_validators does not take any arguments; qed");
let contract_address = self.address.clone();
let do_call = move |id| client
.upgrade()
.ok_or("No client!".into())
.and_then(|c| c.call_contract(id, contract_address.clone(), data.clone()))
.map(|raw_output| call.decode_output(raw_output).expect("ethabi is correct; qed"));
*self.provider.write() = Some(provider::Contract::new(do_call));
}
}
mod provider {
use std::string::String;
use std::result::Result;
use {util, ethabi};
use types::ids::BlockId;
pub struct Contract {
do_call: Box<Fn(BlockId) -> Result<Vec<ethabi::Token>, String> + Send + Sync + 'static>,
}
impl Contract {
pub fn new<F>(do_call: F) -> Self where F: Fn(BlockId) -> Result<Vec<ethabi::Token>, String> + Send + Sync + 'static {
Contract {
do_call: Box::new(do_call),
}
}
/// Gets validators from contract with interface: `{"constant":true,"inputs":[],"name":"getValidators","outputs":[{"name":"","type":"address[]"}],"payable":false,"type":"function"}`
pub fn get_validators(&self, id: BlockId) -> Result<Vec<util::Address>, String> {
Ok((self.do_call)(id)?
.into_iter()
.rev()
.collect::<Vec<_>>()
.pop()
.expect("get_validators returns one argument; qed")
.to_array()
.and_then(|v| v
.into_iter()
.map(|a| a.to_address())
.collect::<Option<Vec<[u8; 20]>>>())
.expect("get_validators returns a list of addresses; qed")
.into_iter()
.map(util::Address::from)
.collect::<Vec<_>>()
)
}
*self.client.write() = Some(client);
}
}