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Merge pull request #1401 from ethcore/sfedgecase 

Shortcut SF condition when canon known
This commit is contained in:
Arkadiy Paronyan 2016-06-23 13:08:30 +02:00 committed by GitHub
parent fb7ca8539e 129ce97ad5
commit f3486c48ea
3 changed files with 12 additions and 6 deletions
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3
ethcore/src/block.rs
View File

@ -288,6 +288,7 @@ impl<'x> OpenBlock<'x> {
/// Get the environment info concerning this block.
pub fn env_info(&self) -> EnvInfo {
// TODO: memoise.
const SOFT_FORK_BLOCK: u64 = 1775000;
EnvInfo {
number: self.block.base.header.number,
author: self.block.base.header.author.clone(),
@ -296,7 +297,7 @@ impl<'x> OpenBlock<'x> {
last_hashes: self.last_hashes.clone(), // TODO: should be a reference.
gas_used: self.block.receipts.last().map_or(U256::zero(), |r| r.gas_used),
gas_limit: self.block.base.header.gas_limit.clone(),
dao_rescue_block_gas_limit: if self.block.base.header.number == 1760000 { Some(self.block.base.header.gas_limit) } else { self.dao_rescue_block_gas_limit },
dao_rescue_block_gas_limit: if self.block.base.header.number == SOFT_FORK_BLOCK { Some(self.block.base.header.gas_limit) } else { self.dao_rescue_block_gas_limit },
}
}

13
ethcore/src/client/mod.rs
View File

@ -225,14 +225,19 @@ pub trait BlockChainClient : Sync + Send {
}
}
/// Get `Some` gas limit of block 1_760_000, or `None` if chain is not yet that long.
/// Get `Some` gas limit of SOFT_FORK_BLOCK, or `None` if chain is not yet that long.
fn dao_rescue_block_gas_limit(&self, chain_hash: H256) -> Option<U256> {
const SOFT_FORK_BLOCK: u64 = 1775000;
// shortcut if the canon chain is already known.
if self.chain_info().best_block_number > SOFT_FORK_BLOCK + 1000 {
return self.block_header(BlockID::Number(SOFT_FORK_BLOCK)).map(|header| HeaderView::new(&header).gas_limit());
}
// otherwise check according to `chain_hash`.
if let Some(mut header) = self.block_header(BlockID::Hash(chain_hash)) {
if HeaderView::new(&header).number() < 1_760_000 {
if HeaderView::new(&header).number() < SOFT_FORK_BLOCK {
None
} else {
while HeaderView::new(&header).number() != 1_760_000 {
while HeaderView::new(&header).number() != SOFT_FORK_BLOCK {
header = self.block_header(BlockID::Hash(HeaderView::new(&header).parent_hash())).expect("chain is complete; parent of chain entry must be in chain; qed");
}
Some(HeaderView::new(&header).gas_limit())

2
ethcore/src/env_info.rs
View File

@ -40,7 +40,7 @@ pub struct EnvInfo {
/// The gas used.
pub gas_used: U256,
/// Block gas limit at DAO rescue block #1760000 or None if not yet there.
/// Block gas limit at DAO rescue block SOFT_FORK_BLOCK or None if not yet there.
pub dao_rescue_block_gas_limit: Option<U256>,
}