Django GUID attaches a unique correlation ID to all your log outputs for every requests you handle. In other words, every error, and really every log now has an ID connecting it to all other relevant logs, making debugging simple.

The package stores a GUID to an object, making it accessible by using the ID of the current thread. This makes integrations possible, as the ID can be returned as a header (built in setting) or forwarded manually to other systems (built in API), making it possible to extend the reach of correlation IDs to whole systems.

Resources:

• Free software: BSD License
• Documentation: https://django-guid.readthedocs.io
• Homepage: https://github.com/JonasKs/django-guid

Examples

Log output with a GUID:

INFO ... [773fa6885e03493498077a273d1b7f2d] project.views This is a DRF view log, and should have a GUID.
WARNING ... [773fa6885e03493498077a273d1b7f2d] project.services.file Some warning in a function
INFO ... [0d1c3919e46e4cd2b2f4ac9a187a8ea1] project.views This is a DRF view log, and should have a GUID.
INFO ... [99d44111e9174c5a9494275aa7f28858] project.views This is a DRF view log, and should have a GUID.
WARNING ... [0d1c3919e46e4cd2b2f4ac9a187a8ea1] project.services.file Some warning in a function
WARNING ... [99d44111e9174c5a9494275aa7f28858] project.services.file Some warning in a function

Log output without a GUID:

INFO ... project.views This is a DRF view log, and should have a GUID.
WARNING ... project.services.file Some warning in a function
INFO ... project.views This is a DRF view log, and should have a GUID.
INFO ... project.views This is a DRF view log, and should have a GUID.
WARNING ... project.services.file Some warning in a function
WARNING ... project.services.file Some warning in a function

See the documentation for more examples.

Install using pip:

pip install django-guid

Package settings are added in your settings.py:

DJANGO_GUID = {
    GUID_HEADER_NAME = 'Correlation-ID',
    VALIDATE_GUID = True,
    RETURN_HEADER = True,
    EXPOSE_HEADER = True,
    INTEGRATIONS = [],
}

Optional Parameters

• GUID_HEADER_NAME

  The name of the GUID to look for in a header in an incoming request. Remember that it's case insensitive.

  Default: Correlation-ID

• VALIDATE_GUID

  Whether the GUID_HEADER_NAME should be validated or not. If the GUID sent to through the header is not a valid GUID (uuid.uuid4).

  Default: True

• RETURN_HEADER

  Whether to return the GUID (Correlation-ID) as a header in the response or not. It will have the same name as the GUID_HEADER_NAME setting.

  Default: True

• EXPOSE_HEADER

  Whether to return Access-Control-Expose-Headers for the GUID header if RETURN_HEADER is True, has no effect if RETURN_HEADER is False. This is allows the JavaScript Fetch API to access the header when CORS is enabled.

  Default: True

• INTEGRATIONS

  Whether to enable any custom or available integrations with django_guid. As an example, using SentryIntegration() as an integration would set Sentry's transaction_id to match the GUID used by the middleware.

  Default: []

Once settings have set up, add the following to your projects' settings.py:

Add django_guid to your INSTALLED_APPS:

INSTALLED_APPS = [
    ...
    'django_guid',
]

Add the django_guid.middleware.GuidMiddleware to your MIDDLEWARE:

MIDDLEWARE = [
    'django_guid.middleware.GuidMiddleware',
    ...
 ]

It is recommended that you add the middleware at the top, so that the remaining middleware loggers include the requests GUID.

Add django_guid.log_filters.CorrelationId as a filter in your LOGGING configuration:

LOGGING = {
    ...
    'filters': {
        'correlation_id': {
            '()': 'django_guid.log_filters.CorrelationId'
        }
    }
}

Put that filter in your handler:

LOGGING = {
    ...
    'handlers': {
        'console': {
            'class': 'logging.StreamHandler',
            'formatter': 'medium',
            'filters': ['correlation_id'],
        }
    }
}

And make sure to add the new correlation_id filter to one or all of your formatters:

LOGGING = {
    ...
    'formatters': {
        'medium': {
            'format': '%(levelname)s %(asctime)s [%(correlation_id)s] %(name)s %(message)s'
        }
    }
}

If these settings were confusing, please have a look in the demo projects' settings.py file for a complete example.

If you wish to see the Django GUID middleware outputs, you may configure a logger for the module. Simply add django_guid to your loggers in the project, like in the example below:

LOGGING = {
    ...
    'loggers': {
        'django_guid': {
            'handlers': ['console', 'logstash'],
            'level': 'WARNING',
            'propagate': False,
        }
    }
}

This is especially useful when implementing the package, if you plan to pass existing GUIDs to the middleware, as misconfigured GUIDs will not raise exceptions, but will generate warning logs.