Handle chain reorg in event reader about web3-ethereum-defi HOT 4 CLOSED

if extract_timestamps is not None:
    timestamps = extract_timestamps(web3, start_block, end_block)

for log in logs:
    block_hash = log["blockHash"]
    block_number = int(log["blockNumber"], 16)
    # Retrofit our information to the dict
    event_signature = log["topics"][0]
    log["context"] = context
    log["event"] = filter.topics[event_signature]
    if extract_timestamps:
        try:
            log["timestamp"] = timestamps[block_hash]
        except KeyError as e:
            # If the block hash is not found in the timestamps table, it could be due to a chain reorg.
            # In this case, we can try to retrieve the timestamp using the block number instead.
            try:
                block = web3.eth.getBlock(block_number)
                log["timestamp"] = block["timestamp"]
            except Exception as e:
                raise RuntimeError(
                    f"Timestamp missing for block number {block_number:,}, hash {block_hash}, our timestamp table has {len(timestamps)} blocks"
                ) from e
    else:
        log["timestamp"] = None