64 lines
2.2 KiB
Rust
64 lines
2.2 KiB
Rust
use common::*;
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use block::*;
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use spec::*;
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use engine::*;
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/// Engine using Ethash proof-of-work consensus algorithm, suitable for Ethereum
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/// mainnet chains in the Olympic, Frontier and Homestead eras.
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pub struct Ethash {
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spec: Spec,
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}
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impl Ethash {
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pub fn new_boxed(spec: Spec) -> Box<Engine> {
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Box::new(Ethash{spec: spec})
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}
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pub fn new_arc(spec: Spec) -> Arc<Engine> {
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Arc::new(Ethash{spec: spec})
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}
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}
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impl Engine for Ethash {
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fn name(&self) -> &str { "Ethash" }
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fn version(&self) -> SemanticVersion { SemanticVersion::new(1, 0, 0) }
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// Two fields - mix
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fn seal_fields(&self) -> usize { 2 }
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// Two empty data items in RLP.
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fn seal_rlp(&self) -> Bytes { encode(&H64::new()) }
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/// Additional engine-specific information for the user/developer concerning `header`.
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fn extra_info(&self, _header: &Header) -> HashMap<String, String> { HashMap::new() }
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fn spec(&self) -> &Spec { &self.spec }
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fn evm_schedule(&self, _env_info: &EnvInfo) -> EvmSchedule { EvmSchedule::new_frontier() }
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/// Apply the block reward on finalisation of the block.
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/// This assumes that all uncles are valid uncles (i.e. of at least one generation before the current).
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fn on_close_block(&self, block: &mut Block) {
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let reward = self.spec().engine_params.get("blockReward").map(|a| decode(&a)).unwrap_or(U256::from(0u64));
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let fields = block.fields();
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// Bestow block reward
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fields.state.add_balance(&fields.header.author, &(reward + reward / U256::from(32) * U256::from(fields.uncles.len())));
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// Bestow uncle rewards
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let current_number = fields.header.number();
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for u in fields.uncles.iter() {
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fields.state.add_balance(u.author(), &(reward * U256::from((8 + u.number() - current_number) / 8)));
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}
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}
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}
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#[test]
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fn on_close_block() {
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use super::*;
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let engine = new_morden().to_engine().unwrap();
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let genesis_header = engine.spec().genesis_header();
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let mut db = OverlayDB::new_temp();
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engine.spec().ensure_db_good(&mut db);
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let last_hashes = vec![genesis_header.hash()];
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let b = OpenBlock::new(engine.deref(), db, &genesis_header, &last_hashes, Address::zero(), vec![]);
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let b = b.close();
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assert_eq!(b.state().balance(&Address::zero()), U256::from_str("4563918244f40000").unwrap());
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}
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