Empty event log

[jfdelgad]

• Version: 4.b13
• Python: 3.6
• OS: win
• Geth
• Rinkeby

I have a simple contract that produces events. The events are registered on mist correctly.
I can interact with the contract without problems but can't get the events. I am simply doing this:

"RegisterCall" is the name of the event in the contract.

event_filter = mycontract.events.RegisterCall.createFilter(fromBlock=1)
event_filter.get_all_entries()
>>>[]

Any suggestion will be appreciated.

[EralpB]

Can you please put all your code? after instantiating the contract object you need to force update it's address to lowercase address (no EIP-55).

[jfdelgad]

Hi, thanks for your answer

I am not forcing the address to lower case, I will try and will post the results. In the meantime, this is the code. I remove the contract_soruce_code because is not related to the question.

compiled_sol = compile_source(contract_source_code)
mycontract.Interface = compiled_sol[':MyContract']

mycontractAddress = '0x36e87aBE249D4146fA2FED32Ce13f592122c611E'
mycontract = w3.eth.contract(address=mycontractAddress, abi=mycontractInterface['abi'],ContractFactoryClass=ConciseContract)
w3.personal.unlockAccount(w3.eth.accounts[0], '*********', duration=None)

event_filter = mycontract.events.RegisterCall.createFilter(fromBlock=1)
while True:
    print(event_filter.get_all_entries())
    time.sleep(2)

[dylanjw]

Can you try the old api, so I can see if this is a problem specific to the new api?

event_filter = mycontract.eventFilter('RegisterCall', filter_params={'fromBlock': 1})

Are you able to see results with a simple block filter?

block_filter = w3.eth.filter("latest")

If you could post more of your code, it would be helpful.

[EralpB]

@jfdelgad please try this one:

mycontractAddress = '0x36e87aBE249D4146fA2FED32Ce13f592122c611E'
mycontract = w3.eth.contract(address=mycontractAddress, abi=mycontractInterface['abi'],ContractFactoryClass=ConciseContract)
mycontract.address = '0x36e87abe249d4146fa2fed32ce13f592122c611e'  # THIS LINE!
w3.personal.unlockAccount(w3.eth.accounts[0], '*********', duration=None)

# I'm not sure if the following change is required, but just to be on the safe side:
event_filter = mycontract.eventFilter('RegisterCall', {'fromBlock': 0,'toBlock': 'latest'})
while True:
    print(event_filter.get_all_entries())
    time.sleep(2)

[jfdelgad]

Hi Guys

putting the address in lower case throw an error because the address is validated when the event filter is created.

However, by looking at Eralp answer I realize that I never initialize the address in mycontract as he pointed out. That was the issue.

Thanks a lot

[jfdelgad]

Hi

I have again an issue:

This works as I commeneted above (give me a warnig about being deprecated), but works fine

myfilter = mycontract.eventFilter('RegisterCall', {'fromBlock': 0,'toBlock': 'latest'});
eventlist = myfilter.get_all_entries()

I am requested to do use the new api but doesnt work: The list of events is empty

myfilter =  myfilter.events.RegisterCall.createFilter(fromBlock=1,toBlock='latest')
eventlist = myfilter.get_all_entries()

Any ideas what is going on?

[carver]

Is the event in block 0? Your second example skipped it. Try this:

myfilter =  myfilter.events.RegisterCall.createFilter(fromBlock=0, toBlock='latest')
eventlist = myfilter.get_all_entries()

[smartcontracts]

@carver Unfortunately because createFilter does an if not fromBlock check, fromBlock cannot be 0 (because 0 is falsy)

web3.py/web3/contract.py

Lines 1165 to 1166 in 7e3b18e

	if not fromBlock:
	raise ValueError("Missing mandatory keyword argument to createFilter: fromBlock")

[smartcontracts]

I'm having a similar problem getting events to work at all.

I have a testing method in my contract:

    function testDepositEvent()
        public
    {
        Deposit(msg.sender, 1);
    }

I then call that method via web3.py:

    event_filter = root_chain.events.Deposit.createFilter(fromBlock='latest')
    root_chain.functions.testDepositEvent().transact({
        'from': ACCOUNT1
    })
    ...
    print(event_filter.get_all_entries()) # []

A block filter, however, seems to be working perfectly well.

[carver]

Unfortunately because createFilter does an if not fromBlock check, fromBlock cannot be 0 (because 0 is falsy)

Thanks for highlighting that! That's definitely a bug.

[carver]

Can you confirm that the transaction has been mined, like:

    event_filter = root_chain.events.Deposit.createFilter(fromBlock='latest')
    txn_hash = root_chain.functions.testDepositEvent().transact({
        'from': ACCOUNT1
    })
    ...
    w3.eth.getTransactionReceipt(txn_hash)
    print(event_filter.get_all_entries()) # []

[smartcontracts]

@carver It does seem to be mined. Here's the prettified transaction receipt:

AttributeDict({
   'contractAddress':None,
   'cumulativeGasUsed':23401,
   'status':1,
   'blockNumber':20,
   'blockHash':HexBytes('0x2c40d0fa4b9953e33674518d992b64e464e536a9a2b351cd167952fd0d634cc0'),
   'transactionIndex':0,
   'transactionHash':HexBytes('0xd95163c4f91764838d6f3401f319eb37d6d336df3f7485fc74b7d64a2c019be2'),
   'logs':[
      AttributeDict({
         'address':'0x607C0e51D90D118612036d22036c0438c41fD8A1',
         'blockNumber':20,
         'logIndex':0,
         'transactionIndex':0,
         'transactionHash':HexBytes('0xd95163c4f91764838d6f3401f319eb37d6d336df3f7485fc74b7d64a2c019be2'),
         'topics':[
            HexBytes('0x90890809c654f11d6e72a28fa60149770a0d11ec6c92319d6ceb2bb0a4ea1a15'),
            HexBytes('0x0000000000000000000000004b3ec6c9dc67079e82152d6d55d8dd96a8e6aa26'),
            HexBytes('0x0000000000000000000000000000000000000000000000000000000000000064')
         ],
         'type':'mined',
         'blockHash':HexBytes('0x2c40d0fa4b9953e33674518d992b64e464e536a9a2b351cd167952fd0d634cc0'),
         'data':'0x0000000000000000000000000000000000000000000000000000000000000000'
      })
   ],
   'gasUsed':23401
})

And event_filter.get_all_entries() still returns []

I'm running ganache-cli v6.1.0