Bottle-OpenTracing 0.0.3

OpenTracing support for Bottle applications

Bottle-OpenTracing

This package enables distributed tracing in Bottle applications via The OpenTracing Project. It is heavily influenced by the Flask Opentracing implementation.

Installation

Run the following command:

$ pip install Bottle-Opentracing

Usage

This Bottle extension allows for tracing of Bottle apps using the OpenTracing API. All that it requires is for a BottleTracing tracer to be initialized using an instance of an OpenTracing tracer. You can either trace all requests to your site, or use function decorators to trace certain individual requests.

Note: optional_args in both cases are any number of attributes (as strings) of bottle.Request that you wish to set as tags on the created span

Initialize

BottleTracing wraps the tracer instance that's supported by opentracing. To create a BottleTracing object, you can either pass in a tracer object directly or a callable that returns the tracer object. For example:

import opentracing
from bottle_opentracing import BottleTracing

opentracing_tracer = ## some OpenTracing tracer implementation
tracing = BottleTracing(opentracing_tracer, ...)

or

import opentracing
from bottle_opentracing import BottleTracing

def initialize_tracer():
    ...
    return opentracing_tracer

tracing = BottleTracing(initialize_tracer, ...)

Trace All Requests

import opentracing
from bottle_opentracing import BottleTracing

app = bottle.app()

opentracing_tracer = ## some OpenTracing tracer implementation
tracing = BottleTracing(opentracing_tracer, True, app, [optional_args])

Trace Individual Requests

import opentracing
from bottle_opentracing import BottleTracing

app = bottle.app()

opentracing_tracer = ## some OpenTracing tracer implementation  
tracing = BottleTracing(opentracing_tracer)

@app.get('/some_url')
@tracing.trace(optional_args)
def some_view_func():
	...     
	return some_view 

Accessing Spans Manually

In order to access the span for a request, we've provided an method BottleTracing.get_span(request) that returns the span for the request, if it is exists and is not finished. This can be used to log important events to the span, set tags, or create child spans to trace non-RPC events. If no request is passed in, the current request will be used.

Tracing an RPC

If you want to make an RPC and continue an existing trace, you can inject the current span into the RPC. For example, if making an http request, the following code will continue your trace across the wire:

@tracing.trace()
def some_view_func(request):
    new_request = some_http_request
    current_span = tracing.get_span(request)
    text_carrier = {}
    opentracing_tracer.inject(span, opentracing.Format.TEXT_MAP, text_carrier)
    for k, v in text_carrier.iteritems():
        new_request.add_header(k,v)
    ... # make request