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auditable tracing for linking requests between services

Project description

# FRL Flask Request Tracer

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Adds tracing to requests generated by Flask apps.

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

Requests to the 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 the app via the `petitioner` property

```
import flask

print flask.current_app.petitioner
'[Trace-123123,Trace-123432]'
```

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