Source code for google.cloud.logging.handlers.handlers
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"""Python :mod:`logging` handlers for Stackdriver Logging."""
import logging
from google.cloud.logging.handlers.transports import BackgroundThreadTransport
from google.cloud.logging.logger import _GLOBAL_RESOURCE
DEFAULT_LOGGER_NAME = "python"
EXCLUDED_LOGGER_DEFAULTS = ("google.cloud", "google.auth", "google_auth_httplib2")
[docs]class CloudLoggingHandler(logging.StreamHandler):
"""Handler that directly makes Stackdriver logging API calls.
This is a Python standard ``logging`` handler using that can be used to
route Python standard logging messages directly to the Stackdriver
Logging API.
This handler is used when not in GAE or GKE environment.
This handler supports both an asynchronous and synchronous transport.
:type client: :class:`google.cloud.logging.client.Client`
:param client: the authenticated Google Cloud Logging client for this
handler to use
:type name: str
:param name: the name of the custom log in Stackdriver Logging. Defaults
to 'python'. The name of the Python logger will be represented
in the ``python_logger`` field.
:type transport: :class:`type`
:param transport: Class for creating new transport objects. It should
extend from the base :class:`.Transport` type and
implement :meth`.Transport.send`. Defaults to
:class:`.BackgroundThreadTransport`. The other
option is :class:`.SyncTransport`.
:type resource: :class:`~google.cloud.logging.resource.Resource`
:param resource: (Optional) Monitored resource of the entry, defaults
to the global resource type.
:type labels: dict
:param labels: (Optional) Mapping of labels for the entry.
:type stream: file-like object
:param stream: (optional) stream to be used by the handler.
Example:
.. code-block:: python
import logging
import google.cloud.logging
from google.cloud.logging.handlers import CloudLoggingHandler
client = google.cloud.logging.Client()
handler = CloudLoggingHandler(client)
cloud_logger = logging.getLogger('cloudLogger')
cloud_logger.setLevel(logging.INFO)
cloud_logger.addHandler(handler)
cloud_logger.error('bad news') # API call
"""
def __init__(
self,
client,
name=DEFAULT_LOGGER_NAME,
transport=BackgroundThreadTransport,
resource=_GLOBAL_RESOURCE,
labels=None,
stream=None,
):
super(CloudLoggingHandler, self).__init__(stream)
self.name = name
self.client = client
self.transport = transport(client, name)
self.resource = resource
self.labels = 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(CloudLoggingHandler, self).format(record)
self.transport.send(record, message, resource=self.resource, labels=self.labels)
[docs]def setup_logging(
handler, excluded_loggers=EXCLUDED_LOGGER_DEFAULTS, log_level=logging.INFO
):
"""Attach a logging handler to the Python root logger
Excludes loggers that this library itself uses to avoid
infinite recursion.
:type handler: :class:`logging.handler`
:param handler: the handler to attach to the global handler
:type excluded_loggers: tuple
:param excluded_loggers: (Optional) The loggers to not attach the handler
to. This will always include the loggers in the
path of the logging client itself.
:type log_level: int
:param log_level: (Optional) Python logging log level. Defaults to
:const:`logging.INFO`.
Example:
.. code-block:: python
import logging
import google.cloud.logging
from google.cloud.logging.handlers import CloudLoggingHandler
client = google.cloud.logging.Client()
handler = CloudLoggingHandler(client)
google.cloud.logging.handlers.setup_logging(handler)
logging.getLogger().setLevel(logging.DEBUG)
logging.error('bad news') # API call
"""
all_excluded_loggers = set(excluded_loggers + EXCLUDED_LOGGER_DEFAULTS)
logger = logging.getLogger()
logger.setLevel(log_level)
logger.addHandler(handler)
logger.addHandler(logging.StreamHandler())
for logger_name in all_excluded_loggers:
logger = logging.getLogger(logger_name)
logger.propagate = False
logger.addHandler(logging.StreamHandler())