Read timed out. (read timeout=None)

python-arango: 6.1.0 ArangoDB: 3.7.6 Community Edition

When I Execute the next query:

db = ArangoConnection.db()
periodo_cursor = db.aql.execute('''
            FOR t in Periodo
                RETURN t
            ''')

Sometimes I have the next error:

Traceback (most recent call last): File “/Users/isaacfi/Code/eneounam.sip/backend/venv/lib/python3.7/site-packages/flask/app.py”, line 1832, in full_dispatch_request rv = self.dispatch_request() File “/Users/isaacfi/Code/eneounam.sip/backend/venv/lib/python3.7/site-packages/flask/app.py”, line 1818, in dispatch_request return self.view_functionsrule.endpoint File “/Users/isaacfi/Code/eneounam.sip/backend/venv/lib/python3.7/site-packages/flasgger/utils.py”, line 255, in wrapper return function(*args, **kwargs) File “/Users/isaacfi/Code/eneounam.sip/backend/controllers/catalogs_controller.py”, line 115, in get_periodos lastUpdateDate) File “/Users/isaacfi/Code/eneounam.sip/backend/business/catalogs/periodo_business.py”, line 41, in get_periodos ‘’', bind_vars=bind_vars) File “/Users/isaacfi/Code/eneounam.sip/backend/venv/lib/python3.7/site-packages/arango/aql.py”, line 293, in execute return self._execute(request, response_handler) File “/Users/isaacfi/Code/eneounam.sip/backend/venv/lib/python3.7/site-packages/arango/api.py”, line 66, in _execute return self._executor.execute(request, response_handler) File “/Users/isaacfi/Code/eneounam.sip/backend/venv/lib/python3.7/site-packages/arango/executor.py”, line 81, in execute resp = self._conn.send_request(request) File “/Users/isaacfi/Code/eneounam.sip/backend/venv/lib/python3.7/site-packages/arango/connection.py”, line 250, in send_request auth=self._auth File “/Users/isaacfi/Code/eneounam.sip/backend/venv/lib/python3.7/site-packages/arango/http.py”, line 109, in send_request auth=auth File “/Users/isaacfi/Code/eneounam.sip/backend/venv/lib/python3.7/site-packages/requests/sessions.py”, line 533, in request resp = self.send(prep, **send_kwargs) File “/Users/isaacfi/Code/eneounam.sip/backend/venv/lib/python3.7/site-packages/requests/sessions.py”, line 646, in send r = adapter.send(request, **kwargs) File “/Users/isaacfi/Code/eneounam.sip/backend/venv/lib/python3.7/site-packages/requests/adapters.py”, line 529, in send raise ReadTimeout(e, request=request) requests.exceptions.ReadTimeout: HTTPConnectionPool(host=‘132.247.114.25’, port=8529): Read timed out. (read timeout=None)

This usually happends when the server is useless for a while (2 mins approx).

This is how I create the arango client:

from arango import ArangoClient
from arango.database import StandardDatabase
from settings import ARANGO_DB, ARANGO_HOSTS, ARANGO_PASSWORD, ARANGO_USER


class ArangoConnection:

    _db: StandardDatabase = None

    @staticmethod
    def db() -> StandardDatabase:
        """Connection to SIP

        :return: Arango database connection to SIP
        :rtype: StandardDatabase
        """
        if ArangoConnection._db is None:
            arango_client = ArangoClient(hosts=ARANGO_HOSTS)
            ArangoConnection._db = arango_client.db(
                ARANGO_DB, ARANGO_USER, ARANGO_PASSWORD)
        return ArangoConnection._db

BR.

[isaacfi]

I was able to solve the issue setting up the session and requests as follow:

import logging
from typing import Text, Union

from arango.http import HTTPClient
from arango.response import Response
from requests import Session
from requests.adapters import HTTPAdapter
from settings import (ARANGO_CONNECT_TIMEOUT, ARANGO_HOSTS, ARANGO_MAX_TRIES,
                      ARANGO_READ_TIMEOUT)


class ArangoHttpClient(HTTPClient):

    def create_session(self, host):
        session = Session()

        adapter = HTTPAdapter(max_retries=int(ARANGO_MAX_TRIES))
        if ARANGO_HOSTS.startswith('http://'):
            session.mount('http://', adapter)
        if ARANGO_HOSTS.startswith('https://'):
            session.mount('https://', adapter)
        return session

    def send_request(self,
                     session: Session,
                     method: str,
                     url: Union[str, bytes, Text],
                     params=None,
                     data=None,
                     headers=None,
                     auth=None):
        response = session.request(
            method=method,
            url=url,
            params=params,
            data=data,
            headers=headers,
            auth=auth,
            timeout=(float(ARANGO_CONNECT_TIMEOUT), float(ARANGO_READ_TIMEOUT))
        )

        return Response(
            method=response.request.method,
            url=response.url,
            headers=response.headers,
            status_code=response.status_code,
            status_text=response.reason,
            raw_body=response.text,
        )

Where the setting values are:

ARANGO_HOSTS=http://localhost… ARANGO_CONNECT_TIMEOUT=30 ARANGO_READ_TIMEOUT=60 ARANGO_MAX_TRIES=5

BR.

[isaacfi]

Hi @joowani

The issue still appears only in development mode when I run my flask application. But you gave me an idea to manage the sessions with the custom http client and I may fix the problem.

Thank you