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use ethash::{quick_get_difficulty, slow_get_seedhash, EthashManager};
use util::*;
use block::*;
use builtin::Builtin;
use env_info::EnvInfo;
use error::{BlockError, TransactionError, Error};
use header::Header;
use state::CleanupMode;
use spec::CommonParams;
use transaction::UnverifiedTransaction;
use engines::Engine;
use evm::Schedule;
use ethjson;
use rlp::{self, UntrustedRlp, View};
pub const PARITY_GAS_LIMIT_DETERMINANT: U256 = U256([37, 0, 0, 0]);
#[derive(Debug, PartialEq)]
pub struct EthashParams {
pub gas_limit_bound_divisor: U256,
pub minimum_difficulty: U256,
pub difficulty_bound_divisor: U256,
pub difficulty_increment_divisor: u64,
pub duration_limit: u64,
pub block_reward: U256,
pub registrar: Address,
pub homestead_transition: u64,
pub dao_hardfork_transition: u64,
pub dao_hardfork_beneficiary: Address,
pub dao_hardfork_accounts: Vec<Address>,
pub difficulty_hardfork_transition: u64,
pub difficulty_hardfork_bound_divisor: U256,
pub bomb_defuse_transition: u64,
pub eip150_transition: u64,
pub eip155_transition: u64,
pub eip160_transition: u64,
pub eip161abc_transition: u64,
pub eip161d_transition: u64,
pub ecip1010_pause_transition: u64,
pub ecip1010_continue_transition: u64,
pub max_code_size: u64,
}
impl From<ethjson::spec::EthashParams> for EthashParams {
fn from(p: ethjson::spec::EthashParams) -> Self {
EthashParams {
gas_limit_bound_divisor: p.gas_limit_bound_divisor.into(),
minimum_difficulty: p.minimum_difficulty.into(),
difficulty_bound_divisor: p.difficulty_bound_divisor.into(),
difficulty_increment_divisor: p.difficulty_increment_divisor.map_or(10, Into::into),
duration_limit: p.duration_limit.into(),
block_reward: p.block_reward.into(),
registrar: p.registrar.map_or_else(Address::new, Into::into),
homestead_transition: p.homestead_transition.map_or(0, Into::into),
dao_hardfork_transition: p.dao_hardfork_transition.map_or(u64::max_value(), Into::into),
dao_hardfork_beneficiary: p.dao_hardfork_beneficiary.map_or_else(Address::new, Into::into),
dao_hardfork_accounts: p.dao_hardfork_accounts.unwrap_or_else(Vec::new).into_iter().map(Into::into).collect(),
difficulty_hardfork_transition: p.difficulty_hardfork_transition.map_or(u64::max_value(), Into::into),
difficulty_hardfork_bound_divisor: p.difficulty_hardfork_bound_divisor.map_or(p.difficulty_bound_divisor.into(), Into::into),
bomb_defuse_transition: p.bomb_defuse_transition.map_or(u64::max_value(), Into::into),
eip150_transition: p.eip150_transition.map_or(0, Into::into),
eip155_transition: p.eip155_transition.map_or(0, Into::into),
eip160_transition: p.eip160_transition.map_or(0, Into::into),
eip161abc_transition: p.eip161abc_transition.map_or(0, Into::into),
eip161d_transition: p.eip161d_transition.map_or(u64::max_value(), Into::into),
ecip1010_pause_transition: p.ecip1010_pause_transition.map_or(u64::max_value(), Into::into),
ecip1010_continue_transition: p.ecip1010_continue_transition.map_or(u64::max_value(), Into::into),
max_code_size: p.max_code_size.map_or(u64::max_value(), Into::into),
}
}
}
pub struct Ethash {
params: CommonParams,
ethash_params: EthashParams,
builtins: BTreeMap<Address, Builtin>,
pow: EthashManager,
}
impl Ethash {
pub fn new(params: CommonParams, ethash_params: EthashParams, builtins: BTreeMap<Address, Builtin>) -> Self {
Ethash {
params: params,
ethash_params: ethash_params,
builtins: builtins,
pow: EthashManager::new(),
}
}
}
impl Engine for Ethash {
fn name(&self) -> &str { "Ethash" }
fn version(&self) -> SemanticVersion { SemanticVersion::new(1, 0, 0) }
fn seal_fields(&self) -> usize { 2 }
fn params(&self) -> &CommonParams { &self.params }
fn additional_params(&self) -> HashMap<String, String> { hash_map!["registrar".to_owned() => self.ethash_params.registrar.hex()] }
fn builtins(&self) -> &BTreeMap<Address, Builtin> {
&self.builtins
}
fn extra_info(&self, header: &Header) -> BTreeMap<String, String> {
map!["nonce".to_owned() => format!("0x{}", header.nonce().hex()), "mixHash".to_owned() => format!("0x{}", header.mix_hash().hex())]
}
fn schedule(&self, env_info: &EnvInfo) -> Schedule {
trace!(target: "client", "Creating schedule. fCML={}, bGCML={}", self.ethash_params.homestead_transition, self.ethash_params.eip150_transition);
if env_info.number < self.ethash_params.homestead_transition {
Schedule::new_frontier()
} else if env_info.number < self.ethash_params.eip150_transition {
Schedule::new_homestead()
} else {
Schedule::new_post_eip150(
self.ethash_params.max_code_size as usize,
env_info.number >= self.ethash_params.eip160_transition,
env_info.number >= self.ethash_params.eip161abc_transition,
env_info.number >= self.ethash_params.eip161d_transition
)
}
}
fn signing_network_id(&self, env_info: &EnvInfo) -> Option<u64> {
if env_info.number >= self.ethash_params.eip155_transition {
Some(self.params().chain_id)
} else {
None
}
}
fn populate_from_parent(&self, header: &mut Header, parent: &Header, gas_floor_target: U256, gas_ceil_target: U256) {
let difficulty = self.calculate_difficulty(header, parent);
let gas_limit = {
let gas_limit = parent.gas_limit().clone();
let bound_divisor = self.ethash_params.gas_limit_bound_divisor;
let lower_limit = gas_limit - gas_limit / bound_divisor + 1.into();
let upper_limit = gas_limit + gas_limit / bound_divisor - 1.into();
let gas_limit = if gas_limit < gas_floor_target {
let gas_limit = min(gas_floor_target, upper_limit);
round_block_gas_limit(gas_limit, lower_limit, upper_limit)
} else if gas_limit > gas_ceil_target {
let gas_limit = max(gas_ceil_target, lower_limit);
round_block_gas_limit(gas_limit, lower_limit, upper_limit)
} else {
let total_lower_limit = max(lower_limit, gas_floor_target);
let total_upper_limit = min(upper_limit, gas_ceil_target);
let gas_limit = max(gas_floor_target, min(total_upper_limit,
lower_limit + (header.gas_used().clone() * 6.into() / 5.into()) / bound_divisor));
round_block_gas_limit(gas_limit, total_lower_limit, total_upper_limit)
};
debug_assert!(gas_limit >= lower_limit);
debug_assert!(gas_limit <= upper_limit);
gas_limit
};
header.set_difficulty(difficulty);
header.set_gas_limit(gas_limit);
if header.number() >= self.ethash_params.dao_hardfork_transition &&
header.number() <= self.ethash_params.dao_hardfork_transition + 9 {
header.set_extra_data(b"dao-hard-fork"[..].to_owned());
}
header.note_dirty();
}
fn on_new_block(&self, block: &mut ExecutedBlock) {
if block.fields().header.number() == self.ethash_params.dao_hardfork_transition {
let mut state = block.fields_mut().state;
for child in &self.ethash_params.dao_hardfork_accounts {
let b = state.balance(child);
state.transfer_balance(child, &self.ethash_params.dao_hardfork_beneficiary, &b, CleanupMode::NoEmpty);
}
}
}
fn on_close_block(&self, block: &mut ExecutedBlock) {
let reward = self.ethash_params.block_reward;
let fields = block.fields_mut();
fields.state.add_balance(fields.header.author(), &(reward + reward / U256::from(32) * U256::from(fields.uncles.len())), CleanupMode::NoEmpty);
let current_number = fields.header.number();
for u in fields.uncles.iter() {
fields.state.add_balance(u.author(), &(reward * U256::from(8 + u.number() - current_number) / U256::from(8)), CleanupMode::NoEmpty);
}
if let Err(e) = fields.state.commit() {
warn!("Encountered error on state commit: {}", e);
}
}
fn verify_block_basic(&self, header: &Header, _block: Option<&[u8]>) -> result::Result<(), Error> {
if header.seal().len() != self.seal_fields() {
return Err(From::from(BlockError::InvalidSealArity(
Mismatch { expected: self.seal_fields(), found: header.seal().len() }
)));
}
UntrustedRlp::new(&header.seal()[0]).as_val::<H256>()?;
UntrustedRlp::new(&header.seal()[1]).as_val::<H64>()?;
let min_difficulty = self.ethash_params.minimum_difficulty;
if header.difficulty() < &min_difficulty {
return Err(From::from(BlockError::DifficultyOutOfBounds(OutOfBounds { min: Some(min_difficulty), max: None, found: header.difficulty().clone() })))
}
let difficulty = Ethash::boundary_to_difficulty(&H256(quick_get_difficulty(
&header.bare_hash().0,
header.nonce().low_u64(),
&header.mix_hash().0
)));
if &difficulty < header.difficulty() {
return Err(From::from(BlockError::InvalidProofOfWork(OutOfBounds { min: Some(header.difficulty().clone()), max: None, found: difficulty })));
}
if header.number() >= self.ethash_params.dao_hardfork_transition &&
header.number() <= self.ethash_params.dao_hardfork_transition + 9 &&
header.extra_data()[..] != b"dao-hard-fork"[..] {
return Err(From::from(BlockError::ExtraDataOutOfBounds(OutOfBounds { min: None, max: None, found: 0 })));
}
if header.gas_limit() > &0x7fffffffffffffffu64.into() {
return Err(From::from(BlockError::InvalidGasLimit(OutOfBounds { min: None, max: Some(0x7fffffffffffffffu64.into()), found: header.gas_limit().clone() })));
}
Ok(())
}
fn verify_block_unordered(&self, header: &Header, _block: Option<&[u8]>) -> result::Result<(), Error> {
if header.seal().len() != self.seal_fields() {
return Err(From::from(BlockError::InvalidSealArity(
Mismatch { expected: self.seal_fields(), found: header.seal().len() }
)));
}
let result = self.pow.compute_light(header.number() as u64, &header.bare_hash().0, header.nonce().low_u64());
let mix = H256(result.mix_hash);
let difficulty = Ethash::boundary_to_difficulty(&H256(result.value));
trace!(target: "miner", "num: {}, seed: {}, h: {}, non: {}, mix: {}, res: {}" , header.number() as u64, H256(slow_get_seedhash(header.number() as u64)), header.bare_hash(), header.nonce().low_u64(), H256(result.mix_hash), H256(result.value));
if mix != header.mix_hash() {
return Err(From::from(BlockError::MismatchedH256SealElement(Mismatch { expected: mix, found: header.mix_hash() })));
}
if &difficulty < header.difficulty() {
return Err(From::from(BlockError::InvalidProofOfWork(OutOfBounds { min: Some(header.difficulty().clone()), max: None, found: difficulty })));
}
Ok(())
}
fn verify_block_family(&self, header: &Header, parent: &Header, _block: Option<&[u8]>) -> result::Result<(), Error> {
if header.number() == 0 {
return Err(From::from(BlockError::RidiculousNumber(OutOfBounds { min: Some(1), max: None, found: header.number() })));
}
let expected_difficulty = self.calculate_difficulty(header, parent);
if header.difficulty() != &expected_difficulty {
return Err(From::from(BlockError::InvalidDifficulty(Mismatch { expected: expected_difficulty, found: header.difficulty().clone() })))
}
let gas_limit_divisor = self.ethash_params.gas_limit_bound_divisor;
let min_gas = parent.gas_limit().clone() - parent.gas_limit().clone() / gas_limit_divisor;
let max_gas = parent.gas_limit().clone() + parent.gas_limit().clone() / gas_limit_divisor;
if header.gas_limit() <= &min_gas || header.gas_limit() >= &max_gas {
return Err(From::from(BlockError::InvalidGasLimit(OutOfBounds { min: Some(min_gas), max: Some(max_gas), found: header.gas_limit().clone() })));
}
Ok(())
}
fn verify_transaction_basic(&self, t: &UnverifiedTransaction, header: &Header) -> result::Result<(), Error> {
if header.number() >= self.ethash_params.homestead_transition {
t.check_low_s()?;
}
if let Some(n) = t.network_id() {
if header.number() < self.ethash_params.eip155_transition || n != self.params().chain_id {
return Err(TransactionError::InvalidNetworkId.into())
}
}
Ok(())
}
}
fn round_block_gas_limit(gas_limit: U256, lower_limit: U256, upper_limit: U256) -> U256 {
let increased_gas_limit = gas_limit + (PARITY_GAS_LIMIT_DETERMINANT - gas_limit % PARITY_GAS_LIMIT_DETERMINANT);
if increased_gas_limit > upper_limit {
let decreased_gas_limit = increased_gas_limit - PARITY_GAS_LIMIT_DETERMINANT;
if decreased_gas_limit < lower_limit {
gas_limit
} else {
decreased_gas_limit
}
} else {
increased_gas_limit
}
}
#[cfg_attr(feature="dev", allow(wrong_self_convention))]
impl Ethash {
fn calculate_difficulty(&self, header: &Header, parent: &Header) -> U256 {
const EXP_DIFF_PERIOD: u64 = 100000;
if header.number() == 0 {
panic!("Can't calculate genesis block difficulty");
}
let min_difficulty = self.ethash_params.minimum_difficulty;
let difficulty_hardfork = header.number() >= self.ethash_params.difficulty_hardfork_transition;
let difficulty_bound_divisor = match difficulty_hardfork {
true => self.ethash_params.difficulty_hardfork_bound_divisor,
false => self.ethash_params.difficulty_bound_divisor,
};
let duration_limit = self.ethash_params.duration_limit;
let frontier_limit = self.ethash_params.homestead_transition;
let mut target = if header.number() < frontier_limit {
if header.timestamp() >= parent.timestamp() + duration_limit {
parent.difficulty().clone() - (parent.difficulty().clone() / difficulty_bound_divisor)
} else {
parent.difficulty().clone() + (parent.difficulty().clone() / difficulty_bound_divisor)
}
}
else {
trace!(target: "ethash", "Calculating difficulty parent.difficulty={}, header.timestamp={}, parent.timestamp={}", parent.difficulty(), header.timestamp(), parent.timestamp());
let diff_inc = (header.timestamp() - parent.timestamp()) / self.ethash_params.difficulty_increment_divisor;
if diff_inc <= 1 {
parent.difficulty().clone() + parent.difficulty().clone() / From::from(difficulty_bound_divisor) * From::from(1 - diff_inc)
} else {
parent.difficulty().clone() - parent.difficulty().clone() / From::from(difficulty_bound_divisor) * From::from(min(diff_inc - 1, 99))
}
};
target = max(min_difficulty, target);
if header.number() < self.ethash_params.bomb_defuse_transition {
if header.number() < self.ethash_params.ecip1010_pause_transition {
let period = ((parent.number() + 1) / EXP_DIFF_PERIOD) as usize;
if period > 1 {
target = max(min_difficulty, target + (U256::from(1) << (period - 2)));
}
}
else if header.number() < self.ethash_params.ecip1010_continue_transition {
let fixed_difficulty = ((self.ethash_params.ecip1010_pause_transition / EXP_DIFF_PERIOD) - 2) as usize;
target = max(min_difficulty, target + (U256::from(1) << fixed_difficulty));
}
else {
let period = ((parent.number() + 1) / EXP_DIFF_PERIOD) as usize;
let delay = ((self.ethash_params.ecip1010_continue_transition - self.ethash_params.ecip1010_pause_transition) / EXP_DIFF_PERIOD) as usize;
target = max(min_difficulty, target + (U256::from(1) << (period - delay - 2)));
}
}
target
}
pub fn boundary_to_difficulty(boundary: &H256) -> U256 {
let d = U256::from(*boundary);
if d <= U256::one() {
U256::max_value()
} else {
((U256::one() << 255) / d) << 1
}
}
pub fn difficulty_to_boundary(difficulty: &U256) -> H256 {
if *difficulty <= U256::one() {
U256::max_value().into()
} else {
(((U256::one() << 255) / *difficulty) << 1).into()
}
}
}
impl Header {
pub fn nonce(&self) -> H64 {
rlp::decode(&self.seal()[1])
}
pub fn mix_hash(&self) -> H256 {
rlp::decode(&self.seal()[0])
}
pub fn set_nonce_and_mix_hash(&mut self, nonce: &H64, mix_hash: &H256) {
self.set_seal(vec![rlp::encode(mix_hash).to_vec(), rlp::encode(nonce).to_vec()]);
}
}
#[cfg(test)]
mod tests {
use util::*;
use block::*;
use tests::helpers::*;
use engines::Engine;
use env_info::EnvInfo;
use error::{BlockError, Error};
use header::Header;
use super::super::{new_morden, new_homestead_test};
use super::{Ethash, EthashParams, PARITY_GAS_LIMIT_DETERMINANT};
use rlp;
#[test]
fn on_close_block() {
let spec = new_morden();
let engine = &*spec.engine;
let genesis_header = spec.genesis_header();
let mut db_result = get_temp_state_db();
let db = spec.ensure_db_good(db_result.take(), &Default::default()).unwrap();
let last_hashes = Arc::new(vec![genesis_header.hash()]);
let b = OpenBlock::new(engine, Default::default(), false, db, &genesis_header, last_hashes, Address::zero(), (3141562.into(), 31415620.into()), vec![]).unwrap();
let b = b.close();
assert_eq!(b.state().balance(&Address::zero()), U256::from_str("4563918244f40000").unwrap());
}
#[test]
fn on_close_block_with_uncle() {
let spec = new_morden();
let engine = &*spec.engine;
let genesis_header = spec.genesis_header();
let mut db_result = get_temp_state_db();
let db = spec.ensure_db_good(db_result.take(), &Default::default()).unwrap();
let last_hashes = Arc::new(vec![genesis_header.hash()]);
let mut b = OpenBlock::new(engine, Default::default(), false, db, &genesis_header, last_hashes, Address::zero(), (3141562.into(), 31415620.into()), vec![]).unwrap();
let mut uncle = Header::new();
let uncle_author: Address = "ef2d6d194084c2de36e0dabfce45d046b37d1106".into();
uncle.set_author(uncle_author);
b.push_uncle(uncle).unwrap();
let b = b.close();
assert_eq!(b.state().balance(&Address::zero()), "478eae0e571ba000".into());
assert_eq!(b.state().balance(&uncle_author), "3cb71f51fc558000".into());
}
#[test]
fn has_valid_metadata() {
let engine = new_morden().engine;
assert!(!engine.name().is_empty());
assert!(engine.version().major >= 1);
}
#[test]
fn can_return_schedule() {
let engine = new_morden().engine;
let schedule = engine.schedule(&EnvInfo {
number: 10000000,
author: 0.into(),
timestamp: 0,
difficulty: 0.into(),
last_hashes: Arc::new(vec![]),
gas_used: 0.into(),
gas_limit: 0.into(),
});
assert!(schedule.stack_limit > 0);
let schedule = engine.schedule(&EnvInfo {
number: 100,
author: 0.into(),
timestamp: 0,
difficulty: 0.into(),
last_hashes: Arc::new(vec![]),
gas_used: 0.into(),
gas_limit: 0.into(),
});
assert!(!schedule.have_delegate_call);
}
#[test]
fn can_do_seal_verification_fail() {
let engine = new_morden().engine;
let header: Header = Header::default();
let verify_result = engine.verify_block_basic(&header, None);
match verify_result {
Err(Error::Block(BlockError::InvalidSealArity(_))) => {},
Err(_) => { panic!("should be block seal-arity mismatch error (got {:?})", verify_result); },
_ => { panic!("Should be error, got Ok"); },
}
}
#[test]
fn can_do_difficulty_verification_fail() {
let engine = new_morden().engine;
let mut header: Header = Header::default();
header.set_seal(vec![rlp::encode(&H256::zero()).to_vec(), rlp::encode(&H64::zero()).to_vec()]);
let verify_result = engine.verify_block_basic(&header, None);
match verify_result {
Err(Error::Block(BlockError::DifficultyOutOfBounds(_))) => {},
Err(_) => { panic!("should be block difficulty error (got {:?})", verify_result); },
_ => { panic!("Should be error, got Ok"); },
}
}
#[test]
fn can_do_proof_of_work_verification_fail() {
let engine = new_morden().engine;
let mut header: Header = Header::default();
header.set_seal(vec![rlp::encode(&H256::zero()).to_vec(), rlp::encode(&H64::zero()).to_vec()]);
header.set_difficulty(U256::from_str("ffffffffffffffffffffffffffffffffffffffffffffaaaaaaaaaaaaaaaaaaaa").unwrap());
let verify_result = engine.verify_block_basic(&header, None);
match verify_result {
Err(Error::Block(BlockError::InvalidProofOfWork(_))) => {},
Err(_) => { panic!("should be invalid proof of work error (got {:?})", verify_result); },
_ => { panic!("Should be error, got Ok"); },
}
}
#[test]
fn can_do_seal_unordered_verification_fail() {
let engine = new_morden().engine;
let header: Header = Header::default();
let verify_result = engine.verify_block_unordered(&header, None);
match verify_result {
Err(Error::Block(BlockError::InvalidSealArity(_))) => {},
Err(_) => { panic!("should be block seal-arity mismatch error (got {:?})", verify_result); },
_ => { panic!("Should be error, got Ok"); },
}
}
#[test]
fn can_do_seal256_verification_fail() {
let engine = new_morden().engine;
let mut header: Header = Header::default();
header.set_seal(vec![rlp::encode(&H256::zero()).to_vec(), rlp::encode(&H64::zero()).to_vec()]);
let verify_result = engine.verify_block_unordered(&header, None);
match verify_result {
Err(Error::Block(BlockError::MismatchedH256SealElement(_))) => {},
Err(_) => { panic!("should be invalid 256-bit seal fail (got {:?})", verify_result); },
_ => { panic!("Should be error, got Ok"); },
}
}
#[test]
fn can_do_proof_of_work_unordered_verification_fail() {
let engine = new_morden().engine;
let mut header: Header = Header::default();
header.set_seal(vec![rlp::encode(&H256::from("b251bd2e0283d0658f2cadfdc8ca619b5de94eca5742725e2e757dd13ed7503d")).to_vec(), rlp::encode(&H64::zero()).to_vec()]);
header.set_difficulty(U256::from_str("ffffffffffffffffffffffffffffffffffffffffffffaaaaaaaaaaaaaaaaaaaa").unwrap());
let verify_result = engine.verify_block_unordered(&header, None);
match verify_result {
Err(Error::Block(BlockError::InvalidProofOfWork(_))) => {},
Err(_) => { panic!("should be invalid proof-of-work fail (got {:?})", verify_result); },
_ => { panic!("Should be error, got Ok"); },
}
}
#[test]
fn can_verify_block_family_genesis_fail() {
let engine = new_morden().engine;
let header: Header = Header::default();
let parent_header: Header = Header::default();
let verify_result = engine.verify_block_family(&header, &parent_header, None);
match verify_result {
Err(Error::Block(BlockError::RidiculousNumber(_))) => {},
Err(_) => { panic!("should be invalid block number fail (got {:?})", verify_result); },
_ => { panic!("Should be error, got Ok"); },
}
}
#[test]
fn can_verify_block_family_difficulty_fail() {
let engine = new_morden().engine;
let mut header: Header = Header::default();
header.set_number(2);
let mut parent_header: Header = Header::default();
parent_header.set_number(1);
let verify_result = engine.verify_block_family(&header, &parent_header, None);
match verify_result {
Err(Error::Block(BlockError::InvalidDifficulty(_))) => {},
Err(_) => { panic!("should be invalid difficulty fail (got {:?})", verify_result); },
_ => { panic!("Should be error, got Ok"); },
}
}
#[test]
fn can_verify_block_family_gas_fail() {
let engine = new_morden().engine;
let mut header: Header = Header::default();
header.set_number(2);
header.set_difficulty(U256::from_str("0000000000000000000000000000000000000000000000000000000000020000").unwrap());
let mut parent_header: Header = Header::default();
parent_header.set_number(1);
let verify_result = engine.verify_block_family(&header, &parent_header, None);
match verify_result {
Err(Error::Block(BlockError::InvalidGasLimit(_))) => {},
Err(_) => { panic!("should be invalid difficulty fail (got {:?})", verify_result); },
_ => { panic!("Should be error, got Ok"); },
}
}
#[test]
fn test_difficulty_to_boundary() {
let _ = Ethash::difficulty_to_boundary(&U256::from(0));
assert_eq!(Ethash::difficulty_to_boundary(&U256::from(1)), H256::from(U256::max_value()));
assert_eq!(Ethash::difficulty_to_boundary(&U256::from(2)), H256::from_str("8000000000000000000000000000000000000000000000000000000000000000").unwrap());
assert_eq!(Ethash::difficulty_to_boundary(&U256::from(4)), H256::from_str("4000000000000000000000000000000000000000000000000000000000000000").unwrap());
assert_eq!(Ethash::difficulty_to_boundary(&U256::from(32)), H256::from_str("0800000000000000000000000000000000000000000000000000000000000000").unwrap());
}
#[test]
fn difficulty_frontier() {
let spec = new_homestead_test();
let ethparams = get_default_ethash_params();
let ethash = Ethash::new(spec.params, ethparams, BTreeMap::new());
let mut parent_header = Header::default();
parent_header.set_number(1000000);
parent_header.set_difficulty(U256::from_str("b69de81a22b").unwrap());
parent_header.set_timestamp(1455404053);
let mut header = Header::default();
header.set_number(parent_header.number() + 1);
header.set_timestamp(1455404058);
let difficulty = ethash.calculate_difficulty(&header, &parent_header);
assert_eq!(U256::from_str("b6b4bbd735f").unwrap(), difficulty);
}
#[test]
fn difficulty_homestead() {
let spec = new_homestead_test();
let ethparams = get_default_ethash_params();
let ethash = Ethash::new(spec.params, ethparams, BTreeMap::new());
let mut parent_header = Header::default();
parent_header.set_number(1500000);
parent_header.set_difficulty(U256::from_str("1fd0fd70792b").unwrap());
parent_header.set_timestamp(1463003133);
let mut header = Header::default();
header.set_number(parent_header.number() + 1);
header.set_timestamp(1463003177);
let difficulty = ethash.calculate_difficulty(&header, &parent_header);
assert_eq!(U256::from_str("1fc50f118efe").unwrap(), difficulty);
}
#[test]
fn difficulty_classic_bomb_delay() {
let spec = new_homestead_test();
let ethparams = EthashParams {
ecip1010_pause_transition: 3000000,
..get_default_ethash_params()
};
let ethash = Ethash::new(spec.params, ethparams, BTreeMap::new());
let mut parent_header = Header::default();
parent_header.set_number(3500000);
parent_header.set_difficulty(U256::from_str("6F62EAF8D3C").unwrap());
parent_header.set_timestamp(1452838500);
let mut header = Header::default();
header.set_number(parent_header.number() + 1);
header.set_timestamp(parent_header.timestamp() + 20);
assert_eq!(
U256::from_str("6F55FE9B74B").unwrap(),
ethash.calculate_difficulty(&header, &parent_header)
);
header.set_timestamp(parent_header.timestamp() + 5);
assert_eq!(
U256::from_str("6F71D75632D").unwrap(),
ethash.calculate_difficulty(&header, &parent_header)
);
header.set_timestamp(parent_header.timestamp() + 80);
assert_eq!(
U256::from_str("6F02746B3A5").unwrap(),
ethash.calculate_difficulty(&header, &parent_header)
);
}
#[test]
fn test_difficulty_bomb_continue() {
let spec = new_homestead_test();
let ethparams = EthashParams {
ecip1010_pause_transition: 3000000,
ecip1010_continue_transition: 5000000,
..get_default_ethash_params()
};
let ethash = Ethash::new(spec.params, ethparams, BTreeMap::new());
let mut parent_header = Header::default();
parent_header.set_number(5000102);
parent_header.set_difficulty(U256::from_str("14944397EE8B").unwrap());
parent_header.set_timestamp(1513175023);
let mut header = Header::default();
header.set_number(parent_header.number() + 1);
header.set_timestamp(parent_header.timestamp() + 6);
assert_eq!(
U256::from_str("1496E6206188").unwrap(),
ethash.calculate_difficulty(&header, &parent_header)
);
parent_header.set_number(5100123);
parent_header.set_difficulty(U256::from_str("14D24B39C7CF").unwrap());
parent_header.set_timestamp(1514609324);
header.set_number(parent_header.number() + 1);
header.set_timestamp(parent_header.timestamp() + 41);
assert_eq!(
U256::from_str("14CA9C5D9227").unwrap(),
ethash.calculate_difficulty(&header, &parent_header)
);
parent_header.set_number(6150001);
parent_header.set_difficulty(U256::from_str("305367B57227").unwrap());
parent_header.set_timestamp(1529664575);
header.set_number(parent_header.number() + 1);
header.set_timestamp(parent_header.timestamp() + 105);
assert_eq!(
U256::from_str("309D09E0C609").unwrap(),
ethash.calculate_difficulty(&header, &parent_header)
);
parent_header.set_number(8000000);
parent_header.set_difficulty(U256::from_str("1180B36D4CE5B6A").unwrap());
parent_header.set_timestamp(1535431724);
header.set_number(parent_header.number() + 1);
header.set_timestamp(parent_header.timestamp() + 420);
assert_eq!(
U256::from_str("5126FFD5BCBB9E7").unwrap(),
ethash.calculate_difficulty(&header, &parent_header)
);
}
#[test]
fn gas_limit_is_multiple_of_determinant() {
let spec = new_homestead_test();
let ethash = Ethash::new(spec.params, get_default_ethash_params(), BTreeMap::new());
let mut parent = Header::new();
let mut header = Header::new();
header.set_number(1);
assert_eq!(PARITY_GAS_LIMIT_DETERMINANT, U256::from(37));
parent.set_gas_limit(U256::from(50_000));
ethash.populate_from_parent(&mut header, &parent, U256::from(100_000), U256::from(200_000));
assert_eq!(*header.gas_limit(), U256::from(50_024));
parent.set_gas_limit(U256::from(250_000));
ethash.populate_from_parent(&mut header, &parent, U256::from(100_000), U256::from(200_000));
assert_eq!(*header.gas_limit(), U256::from(249_787));
header.set_gas_used(U256::from(150_000));
parent.set_gas_limit(U256::from(150_000));
ethash.populate_from_parent(&mut header, &parent, U256::from(100_000), U256::from(200_000));
assert_eq!(*header.gas_limit(), U256::from(150_035));
header.set_gas_used(U256::from(150_000));
parent.set_gas_limit(U256::from(150_000));
ethash.populate_from_parent(&mut header, &parent, U256::from(100_000), U256::from(150_002));
assert_eq!(*header.gas_limit(), U256::from(149_998));
header.set_gas_used(U256::from(150_000));
parent.set_gas_limit(U256::from(150_000));
ethash.populate_from_parent(&mut header, &parent, U256::from(150_000), U256::from(150_002));
assert_eq!(*header.gas_limit(), U256::from(150_002));
}
}