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auditable tracing for linking requests between services

Project description

# Petitioners

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Adds tracing to requests generated by Flask apps.

@petitioners.register_flask_app('X-Request-Trace', 'Trace-')
class FlaskApp(flask.Flask):

app = FlaskApp('name')

# or if you prefer not to use a decorator

Requests to `app` will now generate response with headers tagged like

X-Request-Trace: Trace-123123

If this header already exists then it will be appended to like

X-Request-Trace: Trace-123123,Trace-123432

The current trace value can be accessed from `app` via the `petitioners` property

>>> import flask
>>> import petitioners
>>> app = flask.Flask('name')
>>> petitioners.Petitioner.register(app)
>>> app.test_request_context().push()
>>> print flask.current_app.petitioners
<Petitioner (<Flask 'name'>)X-Petitioners=[u'OHM-c92bffaf1b27497aad73a1cb02b22059']>

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