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Middleware that enables single request-response cycle tracing by injecting a unique ID into project logs
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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 has passed.)
Resources:
Examples
Log output with a GUID:
.. code-block::
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:
.. code-block::
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 <https://django-guid.readthedocs.io>
_ for more examples.
Installation
Install using pip:
.. code-block:: bash
pip install django-guid
Settings
Package settings are added in your settings.py
:
.. code-block:: python
DJANGO_GUID = {
'GUID_HEADER_NAME': 'Correlation-ID',
'VALIDATE_GUID': True,
'RETURN_HEADER': True,
'EXPOSE_HEADER': True,
'INTEGRATIONS': [],
'IGNORE_URLS': [],
'UUID_LENGTH': 32,
}
Optional Parameters
:code: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
:code:VALIDATE_GUID
Whether the :code:GUID_HEADER_NAME
should be validated or not.
If the GUID sent to through the header is not a valid GUID (:code:uuid.uuid4
).
Default: True
:code: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 :code:GUID_HEADER_NAME
setting.
Default: True
:code:EXPOSE_HEADER
Whether to return :code:Access-Control-Expose-Headers
for the GUID header if
:code:RETURN_HEADER
is :code:True
, has no effect if :code:RETURN_HEADER
is :code:False
.
This is allows the JavaScript Fetch API to access the header when CORS is enabled.
Default: True
:code:INTEGRATIONS
Whether to enable any custom or available integrations with :code:django_guid
.
As an example, using :code:SentryIntegration()
as an integration would set Sentry's :code:transaction_id
to
match the GUID used by the middleware.
Default: []
:code:IGNORE_URLS
URL endpoints where the middleware will be disabled. You can put your health check endpoints here.
Default: []
:code: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
:
Add :code:django_guid
to your :code:INSTALLED_APPS
:
.. code-block:: python
INSTALLED_APPS = [
...
'django_guid',
]
Add the :code:django_guid.middleware.guid_middleware
to your MIDDLEWARE
:
.. code-block:: python
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.
Add :code:django_guid.log_filters.CorrelationId
as a filter in your LOGGING
configuration:
.. code-block:: python
LOGGING = {
...
'filters': {
'correlation_id': {
'()': 'django_guid.log_filters.CorrelationId'
}
}
}
Put that filter in your handler:
.. code-block:: python
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:
.. code-block:: python
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 <https://github.com/snok/django-guid/blob/master/demoproj/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:
.. code-block:: python
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.
FAQs
Middleware that enables single request-response cycle tracing by injecting a unique ID into project logs
We found that django-guid demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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