extract_timestamps_json_rpc_lazy

Documentation for eth_defi.event_reader.lazy_timestamp_reader.extract_timestamps_json_rpc_lazy function.

extract_timestamps_json_rpc_lazy(web3, start_block, end_block, fetch_boundaries=True)

Create a cache container that instead of reading block timestamps upfront for the given range, only calls JSON-RPC API when requested

  • Works on the cases where sparse event data is read over long block range Use slow JSON-RPC block headers call to get this information.

  • The reader is hash based. It is mainly meant to resolve eth_getLogs resulting block hashes to corresponding event timestamps.

  • This is a drop-in replacement for the dict returned by eager eth_defi.reader.extract_timestamps_json_rpc()

Example:

# Allocate timestamp reader for blocks 1...100
timestamps = extract_timestamps_json_rpc_lazy(web3, 1, 100)

# Get a hash of some block
block_hash = web3.eth.get_block(5)["hash"]

# Read timestamp for block 5
unix_time = timestamps[block_hash]

For more information see

  • eth_defi.reader.extract_timestamps_json_rpc()

  • eth_defi.reorganisation_monitor.ReorganisationMonitor

Returns

Wrapper object for block hash based timestamp access.

Parameters

  • web3 (web3.main.Web3) –

  • start_block (int) –

  • end_block (int) –

Return type

eth_defi.event_reader.lazy_timestamp_reader.LazyTimestampContainer