Web3.py EventFilter.get_new_entries() always empty

Question

I've following code to obtain new event entries. The idea is to get latest Transfer events from a specific contract.

from web3 import Web3, HTTPProvider
import json

abi = json.load(open('abi.json'))
address = '0x.....................'

w3 = Web3(HTTPProvider('http://localhost:8545'))

contract = w3.eth.contract(abi=abi,address=address)

event_filter = contract.eventFilter('Transfer',{'fromBlock':0,'toBlock':'latest'})

logs = event_filter.get_new_entries()

print(logs);

There is a local ethereum node running under port 8545 with --rpc.

When I run above script after initiating a transaction, it always prints an empty array.

If I change it to event_filter.get_all_entries() I can see all the transactions. But get_new_entries() doesn't work. Any idea what would be the issue?

Answer 1

If I change it to event_filter.get_all_entries() I can see all the transactions. But get_new_entries() doesn't work. Any idea what would be the issue?

As I can see from web3.py latest documentation:

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The function LogFilter.get_all_entries() is returning all logs which match the filter

Logs will be retrieved using the web3.eth.Eth.getFilterLogs() which returns all logs that match the given filter.

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From the other side we have LogFilter.get_new_entries() which returns only new entries since the last poll.

Logs will be retrieved using the web3.eth.Eth.getFilterChanges() which returns only new entries since the last poll.

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Summarizing.

If you haven't called this method before, it cannot decide which entries are new, so it returns undefined. You should first call LogFilter.get_all_entries() and only after you called it and some changes happened call LogFilter.get_new_entries().

Returns all new entries which occurred since the last call to this method for the given filter_id

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Event Log Filters