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eip100b (#5027)

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* eip100b

* fix eip100b build and tests

* Conventional comparison order
This commit is contained in:
Marek Kotewicz 2017-03-27 16:42:40 +07:00 committed by Gav Wood
parent 109012cae8
commit 23d3b79d9a
3 changed files with 32 additions and 6 deletions
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28
ethcore/src/ethereum/ethash.rs
View File

@ -43,6 +43,8 @@ pub struct EthashParams {
pub difficulty_bound_divisor: U256,
/// Difficulty increment divisor.
pub difficulty_increment_divisor: u64,
/// Metropolis difficulty increment divisor.
pub metropolis_difficulty_increment_divisor: u64,
/// Block duration.
pub duration_limit: u64,
/// Block reward.
@ -63,6 +65,8 @@ pub struct EthashParams {
pub difficulty_hardfork_bound_divisor: U256,
/// Block on which there is no additional difficulty from the exponential bomb.
pub bomb_defuse_transition: u64,
/// Number of first block where EIP-100 rules begin.
pub eip100b_transition: u64,
/// Number of first block where EIP-150 rules begin.
pub eip150_transition: u64,
/// Number of first block where EIP-155 rules begin.
@ -96,6 +100,7 @@ impl From<ethjson::spec::EthashParams> for EthashParams {
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),
metropolis_difficulty_increment_divisor: p.metropolis_difficulty_increment_divisor.map_or(9, Into::into),
duration_limit: p.duration_limit.into(),
block_reward: p.block_reward.into(),
registrar: p.registrar.map_or_else(Address::new, Into::into),
@ -106,6 +111,7 @@ impl From<ethjson::spec::EthashParams> for EthashParams {
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),
eip100b_transition: p.eip100b_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),
@ -406,6 +412,8 @@ impl Ethash {
panic!("Can't calculate genesis block difficulty");
}
let parent_has_uncles = parent.uncles_hash() != &sha3::SHA3_EMPTY_LIST_RLP;
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 {
@ -417,19 +425,27 @@ impl Ethash {
let mut target = if header.number() < frontier_limit {
if header.timestamp() >= parent.timestamp() + duration_limit {
parent.difficulty().clone() - (parent.difficulty().clone() / difficulty_bound_divisor)
*parent.difficulty() - (*parent.difficulty() / difficulty_bound_divisor)
} else {
parent.difficulty().clone() + (parent.difficulty().clone() / difficulty_bound_divisor)
*parent.difficulty() + (*parent.difficulty() / difficulty_bound_divisor)
}
}
else {
trace!(target: "ethash", "Calculating difficulty parent.difficulty={}, header.timestamp={}, parent.timestamp={}", parent.difficulty(), header.timestamp(), parent.timestamp());
//block_diff = parent_diff + parent_diff // 2048 * max(1 - (block_timestamp - parent_timestamp) // 10, -99)
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)
let (increment_divisor, threshold) = if header.number() < self.ethash_params.eip100b_transition {
(self.ethash_params.difficulty_increment_divisor, 1)
} else if parent_has_uncles {
(self.ethash_params.metropolis_difficulty_increment_divisor, 2)
} else {
parent.difficulty().clone() - parent.difficulty().clone() / From::from(difficulty_bound_divisor) * From::from(min(diff_inc - 1, 99))
(self.ethash_params.metropolis_difficulty_increment_divisor, 1)
};
let diff_inc = (header.timestamp() - parent.timestamp()) / increment_divisor;
if diff_inc <= threshold {
*parent.difficulty() + *parent.difficulty() / difficulty_bound_divisor * (threshold - diff_inc).into()
} else {
*parent.difficulty() - *parent.difficulty() / difficulty_bound_divisor * min(diff_inc - threshold, 99).into()
}
};
target = max(min_difficulty, target);

2
ethcore/src/tests/helpers.rs
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@ -438,6 +438,7 @@ pub fn get_default_ethash_params() -> EthashParams{
minimum_difficulty: U256::from(131072),
difficulty_bound_divisor: U256::from(2048),
difficulty_increment_divisor: 10,
metropolis_difficulty_increment_divisor: 9,
duration_limit: 13,
block_reward: U256::from(0),
registrar: "0000000000000000000000000000000000000001".into(),
@ -448,6 +449,7 @@ pub fn get_default_ethash_params() -> EthashParams{
difficulty_hardfork_transition: u64::max_value(),
difficulty_hardfork_bound_divisor: U256::from(0),
bomb_defuse_transition: u64::max_value(),
eip100b_transition: u64::max_value(),
eip150_transition: u64::max_value(),
eip155_transition: u64::max_value(),
eip160_transition: u64::max_value(),

8
json/src/spec/ethash.rs
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@ -35,6 +35,9 @@ pub struct EthashParams {
#[serde(rename="difficultyIncrementDivisor")]
pub difficulty_increment_divisor: Option<Uint>,
/// See main EthashParams docs.
#[serde(rename="metropolisDifficultyIncrementDivisor")]
pub metropolis_difficulty_increment_divisor: Option<Uint>,
/// See main EthashParams docs.
#[serde(rename="durationLimit")]
pub duration_limit: Uint,
/// See main EthashParams docs.
@ -67,6 +70,10 @@ pub struct EthashParams {
#[serde(rename="bombDefuseTransition")]
pub bomb_defuse_transition: Option<Uint>,
/// See main EthashParams docs.
#[serde(rename="eip100bTransition")]
pub eip100b_transition: Option<Uint>,
/// See main EthashParams docs.
#[serde(rename="eip150Transition")]
pub eip150_transition: Option<Uint>,
@ -164,6 +171,7 @@ mod tests {
"difficultyHardforkTransition": "0x59d9",
"difficultyHardforkBoundDivisor": "0x0200",
"bombDefuseTransition": "0x42",
"eip100bTransition": "0x42",
"eip150Transition": "0x42",
"eip155Transition": "0x42",
"eip160Transition": "0x42",