openethereum/crates/ethcore/src/factory.rs

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// Copyright 2015-2020 Parity Technologies (UK) Ltd.
// This file is part of OpenEthereum.
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// OpenEthereum 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.
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// OpenEthereum 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
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// along with OpenEthereum. If not, see <http://www.gnu.org/licenses/>.
use account_db::Factory as AccountFactory;
use ethtrie::RlpCodec;
use evm::{Factory as EvmFactory, VMType};
use keccak_hasher::KeccakHasher;
use trie::TrieFactory;
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use vm::{ActionParams, Exec, Schedule};
use wasm::WasmInterpreter;
const WASM_MAGIC_NUMBER: &'static [u8; 4] = b"\0asm";
/// Virtual machine factory
#[derive(Default, Clone)]
pub struct VmFactory {
evm: EvmFactory,
}
impl VmFactory {
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pub fn create(&self, params: ActionParams, schedule: &Schedule, depth: usize) -> Box<dyn Exec> {
if schedule.wasm.is_some()
&& params.code.as_ref().map_or(false, |code| {
code.len() > 4 && &code[0..4] == WASM_MAGIC_NUMBER
})
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{
Box::new(WasmInterpreter::new(params))
} else {
self.evm.create(params, schedule, depth)
}
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}
pub fn new(evm: VMType, cache_size: usize) -> Self {
VmFactory {
evm: EvmFactory::new(evm, cache_size),
}
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}
}
impl From<EvmFactory> for VmFactory {
fn from(evm: EvmFactory) -> Self {
VmFactory { evm: evm }
}
}
/// Collection of factories.
#[derive(Default, Clone)]
pub struct Factories {
/// factory for evm.
pub vm: VmFactory,
/// factory for tries.
pub trie: TrieFactory<KeccakHasher, RlpCodec>,
/// factory for account databases.
pub accountdb: AccountFactory,
}