On January 1, 2020 this library will no longer support Python 2 on the latest released version. Previously released library versions will continue to be available. For more information please visit Python 2 support on Google Cloud.

Source code for google.cloud.logging.handlers.app_engine

# Copyright 2016 Google LLC All Rights Reserved.
# 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,
# See the License for the specific language governing permissions and
# limitations under the License.

"""Logging handler for App Engine Flexible

Sends logs to the Stackdriver Logging API with the appropriate resource
and labels for App Engine logs.

import logging
import os

from google.cloud.logging.handlers._helpers import get_trace_id
from google.cloud.logging.handlers.transports import BackgroundThreadTransport
from google.cloud.logging.resource import Resource



_TRACE_ID_LABEL = "appengine.googleapis.com/trace_id"

[docs]class AppEngineHandler(logging.StreamHandler): """A logging handler that sends App Engine-formatted logs to Stackdriver. :type client: :class:`~google.cloud.logging.client.Client` :param client: The authenticated Google Cloud Logging client for this handler to use. :type transport: :class:`type` :param transport: The transport class. It should be a subclass of :class:`.Transport`. If unspecified, :class:`.BackgroundThreadTransport` will be used. :type stream: file-like object :param stream: (optional) stream to be used by the handler. """ def __init__( self, client, name=_DEFAULT_GAE_LOGGER_NAME, transport=BackgroundThreadTransport, stream=None, ): super(AppEngineHandler, self).__init__(stream) self.name = name self.client = client self.transport = transport(client, name) self.project_id = os.environ.get( _GAE_PROJECT_ENV_FLEX, os.environ.get(_GAE_PROJECT_ENV_STANDARD, "") ) self.module_id = os.environ.get(_GAE_SERVICE_ENV, "") self.version_id = os.environ.get(_GAE_VERSION_ENV, "") self.resource = self.get_gae_resource()
[docs] def get_gae_resource(self): """Return the GAE resource using the environment variables. :rtype: :class:`~google.cloud.logging.resource.Resource` :returns: Monitored resource for GAE. """ gae_resource = Resource( type="gae_app", labels={ "project_id": self.project_id, "module_id": self.module_id, "version_id": self.version_id, }, ) return gae_resource
[docs] def get_gae_labels(self): """Return the labels for GAE app. If the trace ID can be detected, it will be included as a label. Currently, no other labels are included. :rtype: dict :returns: Labels for GAE app. """ gae_labels = {} trace_id = get_trace_id() if trace_id is not None: gae_labels[_TRACE_ID_LABEL] = trace_id return gae_labels
[docs] def emit(self, record): """Actually log the specified logging record. Overrides the default emit behavior of ``StreamHandler``. See https://docs.python.org/2/library/logging.html#handler-objects :type record: :class:`logging.LogRecord` :param record: The record to be logged. """ message = super(AppEngineHandler, self).format(record) gae_labels = self.get_gae_labels() trace_id = ( "projects/%s/traces/%s" % (self.project_id, gae_labels[_TRACE_ID_LABEL]) if _TRACE_ID_LABEL in gae_labels else None ) self.transport.send( record, message, resource=self.resource, labels=gae_labels, trace=trace_id )