Django GUID
Now with ASGI support!
Django GUID attaches a unique correlation ID/request ID to all your log outputs for every request. In other words, all logs connected to a request now has a unique ID attached to it, making debugging simple.
Which version of Django GUID you should use depends on your Django version and whether you run ASGI or WSGI servers. To determine which Django-GUID version you should use, please see the table below.
| Django version | Django-GUID version |
|---|---|
| 3.1.1 or above | 3.x.x - ASGI and WSGI |
| 3.0.0 - 3.1.0 | 2.x.x - Only WSGI |
| 2.2.x | 2.x.x - Only WSGI |
Django GUID >= 3.0.0 uses ContextVar to store and access the GUID. Previous versions stored the GUID to an object, making it accessible by using the ID of the current thread. (Version 2 of Django GUID is supported until Django2.2 LTS is over.)
Resources:
- Free software: BSD License
- Documentation: https://django-guid.readthedocs.io
- Homepage: https://github.com/snok/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.
Installation
Install using pip:
pip install django-guid
Settings
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': [],
'IGNORE_URLS': [],
'UUID_LENGTH': 32,
}
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_NAMEshould 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_NAMEsetting.Default: True
-
-
-
EXPOSE_HEADER -
Whether to return
Access-Control-Expose-Headersfor the GUID header ifRETURN_HEADERisTrue, has no effect ifRETURN_HEADERisFalse. 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, usingSentryIntegration()as an integration would set Sentry'stransaction_idto match the GUID used by the middleware.Default: []
-
-
-
IGNORE_URLS -
URL endpoints where the middleware will be disabled. You can put your health check endpoints here.
Default: []
-
-
-
UUID_LENGTH -
Lets you optionally trim the length of the package generated UUIDs.
Default: 32
-
Configuration
Once settings have set up, add the following to your projects' settings.py:
1. Installed Apps
Add django_guid to your INSTALLED_APPS:
INSTALLED_APPS = [
...
'django_guid',
]
2. Middleware
Add the django_guid.middleware.guid_middleware to your MIDDLEWARE:
MIDDLEWARE = [
'django_guid.middleware.guid_middleware',
...
]
It is recommended that you add the middleware at the top, so that the remaining middleware loggers include the requests GUID.
3. Logging Configuration
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.
4. Django GUID Logger (Optional)
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.
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