HTTPError at /testing/ 405 Client Error: Method Not Allowed for url:

[rabiaasif]

• Version: x.x.x
• Python: 2.7/3.4/3.5
• OS: osx/linux/win

What was wrong? --- Can't call create filter on contract

Please include any of the following that are applicable:

• The code which produced the error
  myContract = w3.eth.contract(address="some_address",abi=contract_abi) #this works fine, i can call methods from here and i get a response

  myfilter_new= myContract.events.Transfer.createFilter(fromBlock=0, toBlock='latest')
  #when i run this, i get the following issue:

• The full output of the error:

HTTPError at /testing/
405 Client Error: Method Not Allowed for url: https://rinkeby.infura.io/my_api_key

Fill this section in if you know how this could or should be fixed.

[dylanjw]

Infura does not support the eth_newFilter rpc endpoint, because it requires creating stateful filter on the node, and in general Infura doesnt support stateful api's. Infura does support the non-stateful endpoint eth_getLogs. There is an open pull request for a middleware that creates a locally managed filter that uses eth_getLogs (#732). Until that is released, you have the option of using web3.eth.getLogs() or running a local node, like parity or go-ethereum.

An example of using getLogs(), with the assumption that the event is not anonymous:

from eth_utils.abi import event_abi_to_log_topic

event_signature_topic = event_abi_to_log_topic(myContract.events.Transfer.abi)
found_logs = w3.eth.getLogs(
    {
        'address':myContract.address, 
        'fromBlock':0, 
        'toBlock':'latest', 
        'topics':[event_signature_topic]
    })

[carver]

I understand from other threads that you can now use filters with the websocket provider on Infura.

Anyway, this isn't a web3.py bug, so I'll close. Feel free to continue commenting for support, though.