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Shortcut SF condition when canon known

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This commit is contained in:
Gav Wood 2016-06-22 21:37:29 +02:00
parent 5302a7dd58
commit 1602906b56
1 changed files with 5 additions and 0 deletions
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5
ethcore/src/client/mod.rs
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@ -228,6 +228,11 @@ pub trait BlockChainClient : Sync + Send {
/// Get `Some` gas limit of block 1_760_000, or `None` if chain is not yet that long.
fn dao_rescue_block_gas_limit(&self, chain_hash: H256) -> Option<U256> {
// shortcut if the canon chain is already known.
if self.chain_info().best_block_number > 1_761_000 {
return self.block_header(BlockID::Number(1_760_000)).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 {
None