2b1d148ceb
* Add randomness contract support to Authority Round. Changes have been cherry-picked from poanetwork's aura-pos branch. Most of the work has been done by @mbr. * Address review comments for randomness contract. Co-Authored-By: David <dvdplm@gmail.com> * Rename revealSecret to revealNumber * Update Randomness contract bytecode * Use H256, rename secret to random number. * Use get_commit_and_cipher * Clean up Miner::prepare_block. * Remove is_reveal_phase call. * Add more comments, require randomness contract map. * Simplify run_randomness_phase * Address review comments. * Remove Client::transact_contract.
95 lines
3.1 KiB
Rust
95 lines
3.1 KiB
Rust
// Copyright 2015-2019 Parity Technologies (UK) Ltd.
|
|
// This file is part of Parity Ethereum.
|
|
|
|
// Parity Ethereum 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 Ethereum 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 Ethereum. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
//! Utility functions.
|
|
//!
|
|
//! Contains small functions used by the AuRa engine that are not strictly limited to that scope.
|
|
|
|
use std::fmt;
|
|
|
|
use client_traits::EngineClient;
|
|
use common_types::ids::BlockId;
|
|
use ethabi;
|
|
use ethereum_types::Address;
|
|
|
|
/// A contract bound to a client and block number.
|
|
///
|
|
/// A bound contract is a combination of a `Client` reference, a `BlockId` and a contract `Address`.
|
|
/// These three parts are enough to call a contract's function; return values are automatically
|
|
/// decoded.
|
|
pub struct BoundContract<'a> {
|
|
client: &'a dyn EngineClient,
|
|
block_id: BlockId,
|
|
contract_addr: Address,
|
|
}
|
|
|
|
/// Contract call failed error.
|
|
#[derive(Debug)]
|
|
pub enum CallError {
|
|
/// The call itself failed.
|
|
CallFailed(String),
|
|
/// Decoding the return value failed or the decoded value was a failure.
|
|
DecodeFailed(ethabi::Error),
|
|
/// The passed in client reference could not be upgraded to a `BlockchainClient`.
|
|
NotFullClient,
|
|
}
|
|
|
|
impl<'a> fmt::Debug for BoundContract<'a> {
|
|
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
|
fmt.debug_struct("BoundContract")
|
|
.field("client", &(self.client as *const dyn EngineClient))
|
|
.field("block_id", &self.block_id)
|
|
.field("contract_addr", &self.contract_addr)
|
|
.finish()
|
|
}
|
|
}
|
|
|
|
impl<'a> BoundContract<'a> {
|
|
/// Create a new `BoundContract`.
|
|
pub fn new(client: &dyn EngineClient, block_id: BlockId, contract_addr: Address) -> BoundContract {
|
|
BoundContract {
|
|
client,
|
|
block_id,
|
|
contract_addr,
|
|
}
|
|
}
|
|
|
|
/// Perform a function call to an Ethereum machine that doesn't create a transaction or change the state.
|
|
///
|
|
/// Runs a constant function call on `client`. The `call` value can be serialized by calling any
|
|
/// api function generated by the `use_contract!` macro. This does not create any transactions, it only produces a
|
|
/// result based on the state at the current block: It is constant in the sense that it does not alter the EVM
|
|
/// state.
|
|
pub fn call_const<D>(&self, call: (ethabi::Bytes, D)) -> Result<D::Output, CallError>
|
|
where
|
|
D: ethabi::FunctionOutputDecoder,
|
|
{
|
|
let (data, output_decoder) = call;
|
|
|
|
let call_return = self
|
|
.client
|
|
.as_full_client()
|
|
.ok_or(CallError::NotFullClient)?
|
|
.call_contract(self.block_id, self.contract_addr, data)
|
|
.map_err(CallError::CallFailed)?;
|
|
|
|
// Decode the result and return it.
|
|
output_decoder
|
|
.decode(call_return.as_slice())
|
|
.map_err(CallError::DecodeFailed)
|
|
}
|
|
}
|