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OpenTelemetry Falcon Tracing

pypi

This library builds on the OpenTelemetry WSGI middleware to track web requests in Falcon applications.

Installation

pip install opentelemetry-instrumentation-falcon

Configuration

Exclude lists

To exclude certain URLs from being tracked, set the environment variable OTEL_PYTHON_FALCON_EXCLUDED_URLS (or OTEL_PYTHON_EXCLUDED_URLS as fallback) with comma delimited regexes representing which URLs to exclude.

For example,

export OTEL_PYTHON_FALCON_EXCLUDED_URLS="client/.*/info,healthcheck"

will exclude requests such as https://site/client/123/info and https://site/xyz/healthcheck.

Request attributes

To extract certain attributes from Falcon's request object and use them as span attributes, set the environment variable OTEL_PYTHON_FALCON_TRACED_REQUEST_ATTRS to a comma delimited list of request attribute names.

For example,

export OTEL_PYTHON_FALCON_TRACED_REQUEST_ATTRS='query_string,uri_template'

will extract path_info and content_type attributes from every traced request and add them as span attritbues.

Falcon Request object reference: https://falcon.readthedocs.io/en/stable/api/request_and_response.html#id1

Usage

import falcon
from opentelemetry.instrumentation.falcon import FalconInstrumentor

FalconInstrumentor().instrument()

app = falcon.App()

class HelloWorldResource(object):
    def on_get(self, req, resp):
        resp.text = 'Hello World'

app.add_route('/hello', HelloWorldResource())

Request/Response hooks

The instrumentation supports specifying request and response hooks. These are functions that get called back by the instrumentation right after a Span is created for a request and right before the span is finished while processing a response. The hooks can be configured as follows:

from opentelemetry.instrumentation.falcon import FalconInstrumentor

def request_hook(span, req):
    pass

def response_hook(span, req, resp):
    pass

FalconInstrumentor().instrument(request_hook=request_hook, response_hook=response_hook)

References