247 lines
9.0 KiB
Rust
247 lines
9.0 KiB
Rust
extern crate ethash;
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use self::ethash::{quick_get_difficulty, EthashManager, H256 as EH256};
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use common::*;
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use block::*;
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use spec::*;
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use engine::*;
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use evm::Schedule;
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use evm::Factory;
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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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pow: EthashManager,
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factory: Factory,
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u64_params: RwLock<HashMap<String, u64>>,
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u256_params: RwLock<HashMap<String, U256>>,
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}
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impl Ethash {
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/// TODO [arkpar] Please document me
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pub fn new_boxed(spec: Spec) -> Box<Engine> {
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Box::new(Ethash {
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spec: spec,
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pow: EthashManager::new(),
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// TODO [todr] should this return any specific factory?
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factory: Factory::default(),
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u64_params: RwLock::new(HashMap::new()),
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u256_params: RwLock::new(HashMap::new())
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})
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}
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fn u64_param(&self, name: &str) -> u64 {
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*self.u64_params.write().unwrap().entry(name.to_string()).or_insert_with(||
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self.spec().engine_params.get(name).map(|a| decode(&a)).unwrap_or(0u64))
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}
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fn u256_param(&self, name: &str) -> U256 {
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*self.u256_params.write().unwrap().entry(name.to_string()).or_insert_with(||
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self.spec().engine_params.get(name).map(|a| decode(&a)).unwrap_or(x!(0)))
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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 vm_factory(&self) -> &Factory {
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&self.factory
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}
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fn schedule(&self, env_info: &EnvInfo) -> Schedule {
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match env_info.number < self.u64_param("frontierCompatibilityModeLimit") {
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true => Schedule::new_frontier(),
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_ => Schedule::new_homestead(),
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}
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}
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fn populate_from_parent(&self, header: &mut Header, parent: &Header) {
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header.difficulty = self.calculate_difficuty(header, parent);
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header.gas_limit = {
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let gas_floor_target: U256 = x!(3141562);
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let gas_limit = parent.gas_limit;
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let bound_divisor = self.u256_param("gasLimitBoundDivisor");
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if gas_limit < gas_floor_target {
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min(gas_floor_target, gas_limit + gas_limit / bound_divisor - x!(1))
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} else {
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max(gas_floor_target, gas_limit - gas_limit / bound_divisor + x!(1) + (header.gas_used * x!(6) / x!(5)) / bound_divisor)
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}
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};
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// info!("ethash: populate_from_parent #{}: difficulty={} and gas_limit={}", header.number, header.difficulty, header.gas_limit);
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}
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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) / U256::from(8)));
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}
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fields.state.commit();
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}
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fn verify_block_basic(&self, header: &Header, _block: Option<&[u8]>) -> result::Result<(), Error> {
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let min_difficulty = decode(self.spec().engine_params.get("minimumDifficulty").unwrap());
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if header.difficulty < min_difficulty {
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return Err(From::from(BlockError::InvalidDifficulty(Mismatch { expected: min_difficulty, found: header.difficulty })))
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}
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let difficulty = Ethash::boundary_to_difficulty(&Ethash::from_ethash(quick_get_difficulty(
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&Ethash::to_ethash(header.bare_hash()),
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header.nonce(),
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&Ethash::to_ethash(header.mix_hash()))));
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if difficulty < header.difficulty {
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return Err(From::from(BlockError::InvalidEthashDifficulty(Mismatch { expected: header.difficulty, found: difficulty })));
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}
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Ok(())
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}
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fn verify_block_unordered(&self, header: &Header, _block: Option<&[u8]>) -> result::Result<(), Error> {
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let result = self.pow.compute_light(header.number as u64, &Ethash::to_ethash(header.bare_hash()), header.nonce());
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let mix = Ethash::from_ethash(result.mix_hash);
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let difficulty = Ethash::boundary_to_difficulty(&Ethash::from_ethash(result.value));
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if mix != header.mix_hash() {
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return Err(From::from(BlockError::InvalidBlockNonce(Mismatch { expected: mix, found: header.mix_hash() })));
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}
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if difficulty < header.difficulty {
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return Err(From::from(BlockError::InvalidEthashDifficulty(Mismatch { expected: header.difficulty, found: difficulty })));
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}
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Ok(())
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}
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fn verify_block_family(&self, header: &Header, parent: &Header, _block: Option<&[u8]>) -> result::Result<(), Error> {
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// Check difficulty is correct given the two timestamps.
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let expected_difficulty = self.calculate_difficuty(header, parent);
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if header.difficulty != expected_difficulty {
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return Err(From::from(BlockError::InvalidDifficulty(Mismatch { expected: expected_difficulty, found: header.difficulty })))
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}
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let gas_limit_divisor = decode(self.spec().engine_params.get("gasLimitBoundDivisor").unwrap());
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let min_gas = parent.gas_limit - parent.gas_limit / gas_limit_divisor;
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let max_gas = parent.gas_limit + parent.gas_limit / gas_limit_divisor;
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if header.gas_limit <= min_gas || header.gas_limit >= max_gas {
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return Err(From::from(BlockError::InvalidGasLimit(OutOfBounds { min: Some(min_gas), max: Some(max_gas), found: header.gas_limit })));
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}
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Ok(())
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}
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fn verify_transaction_basic(&self, t: &Transaction, header: &Header) -> result::Result<(), Error> {
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if header.number() >= self.u64_param("frontierCompatibilityModeLimit") {
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try!(t.check_low_s());
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}
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Ok(())
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}
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fn verify_transaction(&self, t: &Transaction, _header: &Header) -> Result<(), Error> {
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t.sender().map(|_|()) // Perform EC recovery and cache sender
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}
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}
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impl Ethash {
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fn calculate_difficuty(&self, header: &Header, parent: &Header) -> U256 {
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const EXP_DIFF_PERIOD: u64 = 100000;
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if header.number == 0 {
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panic!("Can't calculate genesis block difficulty");
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}
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let min_difficulty = self.u256_param("minimumDifficulty");
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let difficulty_bound_divisor = self.u256_param("difficultyBoundDivisor");
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let duration_limit = self.u64_param("durationLimit");
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let frontier_limit = self.u64_param("frontierCompatibilityModeLimit");
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let mut target = if header.number < frontier_limit {
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if header.timestamp >= parent.timestamp + duration_limit {
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parent.difficulty - (parent.difficulty / difficulty_bound_divisor)
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}
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else {
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parent.difficulty + (parent.difficulty / difficulty_bound_divisor)
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}
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}
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else {
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let diff_inc = (header.timestamp - parent.timestamp) / 10;
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if diff_inc <= 1 {
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parent.difficulty + parent.difficulty / From::from(2048) * From::from(1 - diff_inc)
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}
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else {
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parent.difficulty - parent.difficulty / From::from(2048) * From::from(max(diff_inc - 1, 99))
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}
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};
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target = max(min_difficulty, target);
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let period = ((parent.number + 1) / EXP_DIFF_PERIOD) as usize;
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if period > 1 {
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target = max(min_difficulty, target + (U256::from(1) << (period - 2)));
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}
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target
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}
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fn boundary_to_difficulty(boundary: &H256) -> U256 {
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U256::from((U512::one() << 256) / x!(U256::from(boundary.as_slice())))
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}
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fn to_ethash(hash: H256) -> EH256 {
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unsafe { mem::transmute(hash) }
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}
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fn from_ethash(hash: EH256) -> H256 {
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unsafe { mem::transmute(hash) }
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}
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}
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impl Header {
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fn nonce(&self) -> u64 {
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decode(&self.seal()[1])
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}
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fn mix_hash(&self) -> H256 {
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decode(&self.seal()[0])
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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 = JournalDB::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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#[test]
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fn on_close_block_with_uncle() {
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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 = JournalDB::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 mut b = OpenBlock::new(engine.deref(), db, &genesis_header, &last_hashes, Address::zero(), vec![]);
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let mut uncle = Header::new();
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let uncle_author = address_from_hex("ef2d6d194084c2de36e0dabfce45d046b37d1106");
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uncle.author = uncle_author.clone();
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b.push_uncle(uncle).unwrap();
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let b = b.close();
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assert_eq!(b.state().balance(&Address::zero()), U256::from_str("478eae0e571ba000").unwrap());
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assert_eq!(b.state().balance(&uncle_author), U256::from_str("3cb71f51fc558000").unwrap());
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}
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// TODO: difficulty test
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