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Check for parent of first ready block being on chain #1812

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Oct 10, 2023
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25 changes: 25 additions & 0 deletions substrate/client/network/sync/src/blocks.rs
Original file line number Diff line number Diff line change
Expand Up @@ -212,6 +212,31 @@ impl<B: BlockT> BlockCollection<B> {
ready
}

/// Returns the block header of the first block that is ready for importing.
/// `from` is the maximum block number for the start of the range that we are interested in.
/// The function will return None if the first block ready is higher than `from`.
/// The logic is structured to be consistent with ready_blocks().
pub fn first_ready_block_header(&self, from: NumberFor<B>) -> Option<B::Header> {
let mut prev = from;
for (&start, range_data) in &self.blocks {
if start > prev {
break
}

match range_data {
BlockRangeState::Complete(blocks) => {
let len = (blocks.len() as u32).into();
prev = start + len;
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if let Some(BlockData { block, .. }) = blocks.first() {
return block.header.clone()
}
},
_ => continue,
}
}
None
}

pub fn clear_queued(&mut self, hash: &B::Hash) {
if let Some((from, to)) = self.queued_blocks.remove(hash) {
let mut block_num = from;
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