/
retry.py
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/
retry.py
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# Copyright 2018 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from google.api_core import exceptions
from google.api_core import retry
from google.auth import exceptions as auth_exceptions
import requests.exceptions
_RETRYABLE_REASONS = frozenset(
["rateLimitExceeded", "backendError", "internalError", "badGateway"]
)
_UNSTRUCTURED_RETRYABLE_TYPES = (
ConnectionError,
exceptions.TooManyRequests,
exceptions.InternalServerError,
exceptions.BadGateway,
requests.exceptions.ChunkedEncodingError,
requests.exceptions.ConnectionError,
requests.exceptions.Timeout,
auth_exceptions.TransportError,
)
_DEFAULT_JOB_DEADLINE = 60.0 * 10.0 # seconds
def _should_retry(exc):
"""Predicate for determining when to retry.
We retry if and only if the 'reason' is 'backendError'
or 'rateLimitExceeded'.
"""
if not hasattr(exc, "errors") or len(exc.errors) == 0:
# Check for unstructured error returns, e.g. from GFE
return isinstance(exc, _UNSTRUCTURED_RETRYABLE_TYPES)
reason = exc.errors[0]["reason"]
return reason in _RETRYABLE_REASONS
DEFAULT_RETRY = retry.Retry(predicate=_should_retry, deadline=600.0)
"""The default retry object.
Any method with a ``retry`` parameter will be retried automatically,
with reasonable defaults. To disable retry, pass ``retry=None``.
To modify the default retry behavior, call a ``with_XXX`` method
on ``DEFAULT_RETRY``. For example, to change the deadline to 30 seconds,
pass ``retry=bigquery.DEFAULT_RETRY.with_deadline(30)``.
"""
DEFAULT_TIMEOUT = 5.0 * 60.0
"""The default API timeout.
This is the time to wait per request. To adjust the total wait time, set a
deadline on the retry object.
"""
job_retry_reasons = "rateLimitExceeded", "backendError"
def _job_should_retry(exc):
if not hasattr(exc, "errors") or len(exc.errors) == 0:
return False
reason = exc.errors[0]["reason"]
return reason in job_retry_reasons
DEFAULT_JOB_RETRY = retry.Retry(
predicate=_job_should_retry, deadline=_DEFAULT_JOB_DEADLINE
)
"""
The default job retry object.
"""