openethereum/ethcore/src/null_engine.rs

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// Copyright 2015, 2016 Ethcore (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/>.
use std::collections::BTreeMap;
use util::hash::Address;
use builtin::Builtin;
use engine::Engine;
use spec::CommonParams;
use evm::{Schedule, Factory};
use env_info::EnvInfo;
/// An engine which does not provide any consensus mechanism.
pub struct NullEngine {
params: CommonParams,
builtins: BTreeMap<Address, Builtin>,
factory: Factory,
}
impl NullEngine {
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/// Returns new instance of NullEngine with default VM Factory
pub fn new(params: CommonParams, builtins: BTreeMap<Address, Builtin>) -> Self {
NullEngine{
params: params,
builtins: builtins,
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factory: Factory::default()
}
}
}
impl Engine for NullEngine {
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fn vm_factory(&self) -> &Factory {
&self.factory
}
fn name(&self) -> &str {
"NullEngine"
}
fn params(&self) -> &CommonParams {
&self.params
}
fn builtins(&self) -> &BTreeMap<Address, Builtin> {
&self.builtins
}
fn schedule(&self, env_info: &EnvInfo) -> Schedule {
if env_info.number < self.params.frontier_compatibility_mode_limit {
Schedule::new_frontier()
} else {
Schedule::new_homestead()
}
}
}