91 lines
2.7 KiB
Rust
91 lines
2.7 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use engines::{Engine, Seal};
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use parity_machine::{Machine, Transactions};
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/// An engine which does not provide any consensus mechanism, just seals blocks internally.
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/// Only seals blocks which have transactions.
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pub struct InstantSeal<M> {
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machine: M,
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}
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impl<M> InstantSeal<M> {
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/// Returns new instance of InstantSeal over the given state machine.
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pub fn new(machine: M) -> Self {
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InstantSeal {
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machine: machine,
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}
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}
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}
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impl<M: Machine> Engine<M> for InstantSeal<M>
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where M::LiveBlock: Transactions
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{
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fn name(&self) -> &str {
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"InstantSeal"
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}
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fn machine(&self) -> &M { &self.machine }
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fn seals_internally(&self) -> Option<bool> { Some(true) }
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fn generate_seal(&self, block: &M::LiveBlock, _parent: &M::Header) -> Seal {
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if block.transactions().is_empty() { Seal::None } else { Seal::Regular(Vec::new()) }
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}
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fn verify_local_seal(&self, _header: &M::Header) -> Result<(), M::Error> {
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Ok(())
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}
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}
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#[cfg(test)]
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mod tests {
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use std::sync::Arc;
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use ethereum_types::{H520, Address};
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use tests::helpers::*;
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use spec::Spec;
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use header::Header;
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use block::*;
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use engines::Seal;
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#[test]
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fn instant_can_seal() {
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let spec = Spec::new_instant();
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let engine = &*spec.engine;
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let db = spec.ensure_db_good(get_temp_state_db(), &Default::default()).unwrap();
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let genesis_header = spec.genesis_header();
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let last_hashes = Arc::new(vec![genesis_header.hash()]);
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let b = OpenBlock::new(engine, Default::default(), false, db, &genesis_header, last_hashes, Address::default(), (3141562.into(), 31415620.into()), vec![], false).unwrap();
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let b = b.close_and_lock();
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if let Seal::Regular(seal) = engine.generate_seal(b.block(), &genesis_header) {
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assert!(b.try_seal(engine, seal).is_ok());
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}
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}
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#[test]
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fn instant_cant_verify() {
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let engine = Spec::new_instant().engine;
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let mut header: Header = Header::default();
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assert!(engine.verify_block_basic(&header).is_ok());
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header.set_seal(vec![::rlp::encode(&H520::default()).into_vec()]);
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assert!(engine.verify_block_unordered(&header).is_ok());
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}
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}
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