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Description:

requestid 1.0.1

request-id

Attach a unique identifier to every request in your WSGI application.
request-id is implemented as a WSGI middleware.
The package will do 3 things:

Generate a unique request_id identifier which will be stored in the
WSGI environ and set as the X-Request-ID response header.
Rename the processing thread with the request_id such that any log
messages output by the logger have the request_id attached.
Log the request to the Python stdlib logging library, which can be used
to generate a simple access log.

Installation
You may install the request-id package using pip:
$ pip install request-id

Configure with PasteDeploy
Update your application INI to run in a pipeline with the request-id
filter:
[app:myapp]
use = egg:myapp

[filter:request-id]
use = egg:request-id
format = {status} {REQUEST_METHOD:<6} {REQUEST_PATH:<60} {REQUEST_ID}

[pipeline:main]
pipeline =
request-id
myapp

[loggers]
keys = translogger

[handlers]
keys = translogger

[formatters]
keys = minimal

[logger_translogger]
level = INFO
handlers = translogger
qualname = request_id
propagate = 0

[handler_translogger]
class = StreamHandler
args = (sys.stderr,)
level = NOTSET
formatter = minimal

[formatter_minimal]
format = %(message)s

Configure in code
Create a RequestIdMiddleware object and compose it with your WSGI
application:
from request_id import RequestIdMiddleware
from wsgiref.simple_server import make_server

def app(environ, start_response):
start_response('200 OK', [('Content-Type', 'text/plain')])
yield 'Hello World\n'

app = RequestIdMiddleware(
app,
format='{status} {REQUEST_METHOD:<6} {REQUEST_PATH:<60} {REQUEST_ID}',
)

if __name__ == '__main__':
server = make_server('0.0.0.0', 8080, app)
server.serve_forever()

Access the request_id
The request_id is stored in the request environ dictionary and may
be accessed from anywhere this is available using
request_id.get_request_id(request) where request is an instance of
webob.request.Request.

Settings

logger_name
The name of the Python stdlib logger to which the log output will be
delivered. Default: request_id

logging_level
The name of the Python stdlib logging level on which request information
will be output. Default: INFO

format
A formatting string using PEP-3101 string format syntax. Possible
options are:

REQUEST_ID
REMOTE_ADDR
REMOTE_USER
REQUEST_METHOD
REQUEST_URI
REQUEST_PATH
HTTP_HOST
HTTP_VERSION
HTTP_REFERER
HTTP_USER_AGENT
time
duration
bytes
status

Default: '{REMOTE_ADDR} {HTTP_HOST} {REMOTE_USER} [{time}] "{REQUEST_METHOD} {REQUEST_URI} {HTTP_VERSION}" {status} {bytes} {duration} "{HTTP_REFERER}" "{HTTP_USER_AGENT}" - {REQUEST_ID}

source_header
If not None then the request_id will be pulled from this header
in the request. This is useful if another system upstream is setting a
request identifier which you want to use in the WSGI application.
Default: None

exclude_prefixes
A (space or line separated) list of URL paths to be ignored based on
request.path_info. Paths should have a leading / in order to match
properly. Default: None

Acknowledgements
This code is heavily based on the translogger middleware from Paste.

1.0.1 (2020-10-06)

Fix a bug in which exclude_prefixes was not matching in cases where
the PATH_INFO in the WSGI environ was mutated while processing the
request.

1.0 (2018-11-26)

Fix a bug in exclude_prefixes where it only matches the first request
on Python 3.

0.3.1 (2017-11-26)

Fix changelog.

0.3 (2017-11-26)

Do not crash when the source header is missing. Instead set the request id
to “-“.
Properly format the UTC offset in the {time} timestamp.
Add 100% test coverage.

0.2.1 (2016-11-03)

Fix logging_level option on Python 3.
See https://github.com/mmerickel/request-id/pull/2

0.2 (2016-08-09)

Catch exceptions and return webob.exc.HTTPInternalServerError so
that a request_id may be attached to the response.

0.1.2 (2016-07-26)

Fix a couple bugs with exclude_prefixes and add some docs for it.

0.1.1 (2016-07-26)

Add a new setting exclude_prefixes which can be used to avoid
logging certain requests.

0.1.0 (2016-07-26)

Initial release.