ConnectionError: ('Connection aborted.', ConnectionResetError(104, 'Connection reset by peer')) about dwolla-v2-python

[iteratelance]

Suggestion, wrap session object inside of method rather than the module. I believe that this would alleviate the problem.

def _request_token(client, payload):
    session = requests.session()
    session.headers.update({'user-agent': 'dwolla-v2-python %s' % version})
    res = session.post(client.token_url, data=payload)
    if _is_error(res):
        raise Error.map(res)
    token = client.Token(res.json())
    if client.on_grant is not None:
        client.on_grant(token)
    return token

Current

session = requests.session()
session.headers.update({'user-agent': 'dwolla-v2-python %s' % version})

def _request_token(client, payload):
    res = session.post(client.token_url, data=payload)
    if _is_error(res):
        raise Error.map(res)
    token = client.Token(res.json())
    if client.on_grant is not None:
        client.on_grant(token)
    return token

[sausman]

Hey @iteratelance, thanks for the detailed issue!

A while back we moved the session object to the module (#8) to take advantage of persistent connections and connection pooling.

Requests to www.dwolla.com and api.dwolla.com are handled in a similar way. Requests to www.dwolla.com share a connection pool, whereas requests to api.dwolla.com share a connection pool per-Token.

Does this SO issue sound like it could be what's happening? https://stackoverflow.com/questions/383738/104-connection-reset-by-peer-socket-error-or-when-does-closing-a-socket-resu/35945309#35945309

[iteratelance]

@sausman Thanks for the reply. I think it has something to do with AWS Lambda functions and how they operate. I've ran into this issue in the past when running async and threaded http request on Lambda and ultimately had to use a non threaded transport.

I'm not certain why connection polling has issues on Lambda, perhaps the underlying host might actually change from time to time, even while using a stay warm function for long running process, thus breaking the connection.

My final solution was to close the connection after getting each auth token.

from dwollav2 import auth

def auth():
    client = dwollav2.Client(
            key = config.get('DWOLLA_KEY'),
            secret = config.get('DWOLLA_SECRET'),
            environment = config.get('DWOLLA_ENV')
        )

    application_token = client.Auth.client()
    auth.session.close()
    return application_token