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This library uses the standard Python :code:`logging` functionality to log some RPC events that could be of interest for debugging and monitoring purposes.
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Note the following:
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#. Logs may contain sensitive information. Take care to **restrict access to the logs** if they are saved, whether it be on local storage or on Google Cloud Logging.
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#. Google may refine the occurrence, level, and content of various log messages in this library without flagging such changes as breaking. **Do not depend on immutability of the logging events**.
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#. By default, the logging events from this library are not handled. You must **explicitly configure log handling** using one of the mechanisms below.
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Simple, environment-based configuration
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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To enable logging for this library without any changes in your code, set the :code:`GOOGLE_SDK_PYTHON_LOGGING_SCOPE` environment variable to a valid Google
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logging scope. This configures handling of logging events (at level :code:`logging.DEBUG` or higher) from this library in a default manner, emitting the logged
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messages in a structured format. It does not currently allow customizing the logging levels captured nor the handlers, formatters, etc. used for any logging
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event.
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A logging scope is a period-separated namespace that begins with :code:`google`, identifying the Python module or package to log.
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- Valid logging scopes: :code:`google`, :code:`google.cloud.asset.v1`, :code:`google.api`, :code:`google.auth`, etc.
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- Invalid logging scopes: :code:`foo`, :code:`123`, etc.
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**NOTE**: If the logging scope is invalid, the library does not set up any logging handlers.
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Environment-Based Examples
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^^^^^^^^^^^^^^^^^^^^^^^^^^
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- Enabling the default handler for all Google-based loggers
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.. code-block:: console
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export GOOGLE_SDK_PYTHON_LOGGING_SCOPE=google
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- Enabling the default handler for a specific Google module (for a client library called :code:`library_v1`):
#. Regardless of which of the mechanisms above you use to configure logging for this library, by default logging events are not propagated up to the root
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logger from the `google`-level logger. If you need the events to be propagated to the root logger, you must explicitly set
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:code:`logging.getLogger("google").propagate = True` in your code.
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#. You can mix the different logging configurations above for different Google modules. For example, you may want use a code-based logging configuration for
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one library, but decide you need to also set up environment-based logging configuration for another library.
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#. If you attempt to use both code-based and environment-based configuration for the same module, the environment-based configuration will be ineffectual
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if the code -based configuration gets applied first.
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#. The Google-specific logging configurations (default handlers for environment-based configuration; not propagating logging events to the root logger) get
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executed the first time *any* client library is instantiated in your application, and only if the affected loggers have not been previously configured.
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