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Don't fail badly when no transactions in last 100 blocks. (#2856)

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Gav Wood 2016-10-25 12:21:21 +02:00 committed by GitHub
parent 5ae87a64b1
commit a6fd922ffb
1 changed files with 13 additions and 8 deletions
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21
ethcore/src/client/traits.rs
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@ -194,15 +194,20 @@ pub trait BlockChainClient : Sync + Send {
fn gas_price_statistics(&self, sample_size: usize, distribution_size: usize) -> Result<Vec<U256>, ()> { fn gas_price_statistics(&self, sample_size: usize, distribution_size: usize) -> Result<Vec<U256>, ()> {
let mut h = self.chain_info().best_block_hash; let mut h = self.chain_info().best_block_hash;
let mut corpus = Vec::new(); let mut corpus = Vec::new();
for _ in 0..sample_size { while corpus.is_empty() {
let block_bytes = self.block(BlockID::Hash(h)).expect("h is either the best_block_hash or an ancestor; qed"); for _ in 0..sample_size {
let block = BlockView::new(&block_bytes); let block_bytes = self.block(BlockID::Hash(h)).expect("h is either the best_block_hash or an ancestor; qed");
let header = block.header_view(); let block = BlockView::new(&block_bytes);
if header.number() == 0 { let header = block.header_view();
break; if header.number() == 0 {
if corpus.is_empty() {
corpus.push(20_000_000_000u64.into()); // we have literally no information - it' as good a number as any.
}
break;
}
block.transaction_views().iter().foreach(|t| corpus.push(t.gas_price()));
h = header.parent_hash().clone();
} }
block.transaction_views().iter().foreach(|t| corpus.push(t.gas_price()));
h = header.parent_hash().clone();
} }
corpus.sort(); corpus.sort();
let n = corpus.len(); let n = corpus.len();