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All Projects → census-instrumentation → Opencensus Python

census-instrumentation / Opencensus Python

Licence: apache-2.0

A stats collection and distributed tracing framework

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python

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OpenCensus - A stats collection and distributed tracing framework

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OpenCensus_ for Python. OpenCensus provides a framework to measure a server's resource usage and collect performance stats. This repository contains Python related utilities and supporting software needed by OpenCensus.

.. _OpenCensus: https://github.com/census-instrumentation

API Documentation_

.. _API Documentation: https://opencensus.io/api/python/trace/usage.html

Tracing

Installation & basic usage

Install the opencensus package using pip_ or pipenv_:

 pip install opencensus
 pipenv install opencensus

Initialize a tracer for your application:

.. code:: python

 from opencensus.trace.tracer import Tracer
 from opencensus.trace.samplers import AlwaysOnSampler

 tracer = Tracer(sampler=AlwaysOnSampler())

.. _pip: https://pip.pypa.io .. _pipenv: https://docs.pipenv.org/

Initialize a view_manager and a stats_recorder for your application:

.. code:: python

 from opencensus.stats import stats as stats_module

 stats = stats_module.stats
 view_manager = stats.view_manager
 stats_recorder = stats.stats_recorder

Usage

You can collect traces using the Tracer context manager_:

.. code:: python

from opencensus.trace.tracer import Tracer
from opencensus.trace.samplers import AlwaysOnSampler

# Initialize a tracer, by default using the `PrintExporter`
tracer = Tracer(sampler=AlwaysOnSampler())

# Example for creating nested spans
with tracer.span(name='span1'):
    do_something_to_trace()
    with tracer.span(name='span1_child1'):
        do_something_to_trace()
    with tracer.span(name='span1_child2'):
        do_something_to_trace()
with tracer.span(name='span2'):
    do_something_to_trace()

OpenCensus will collect everything within the with statement as a single span.

Alternatively, you can explicitly start and end a span:

.. code:: python

from opencensus.trace.tracer import Tracer
from opencensus.trace.samplers import AlwaysOnSampler

# Initialize a tracer, by default using the `PrintExporter`
tracer = Tracer(sampler=AlwaysOnSampler())

tracer.start_span(name='span1')
do_something_to_trace()
tracer.end_span()

.. _context manager: https://docs.python.org/3/reference/datamodel.html#context-managers

Customization

There are several things you can customize in OpenCensus:

Excludelist, which excludes certain hosts and paths from being tracked. By default, the health check path for the App Engine flexible environment is not tracked, you can turn it on by excluding it from the excludelist setting.
Exporter, which sends the traces. By default, the traces are printed to stdout in JSON format. You can choose different exporters to send the traces to. There are three built-in exporters, which are PrintExporter, FileExporter and LoggingExporter, the other exporters are provided as extensions <#trace-exporter>__.
Sampler, which determines how traces are sampled. The default sampler is the ProbabilitySampler, which samples (i.e. enables tracing for) a percentage of all requests. Sampling is deterministic according to the trace ID. To force sampling for all requests, or to prevent any request from being sampled, see AlwaysOnSampler and AlwaysOffSampler.
Propagator, which serializes and deserializes the SpanContext and its headers. The default propagator is TraceContextPropagator, other propagators include BinaryFormatPropagator, GoogleCloudFormatPropagator and TextFormatPropagator.

You can customize while initializing a tracer.

.. code:: python

import requests

from opencensus.trace import config_integration
from opencensus.trace import file_exporter
from opencensus.trace import tracer as tracer_module
from opencensus.trace.propagation import google_cloud_format
from opencensus.trace.samplers import ProbabilitySampler

config_integration.trace_integrations(['httplib'])

tracer = tracer_module.Tracer(
    exporter=file_exporter.FileExporter(file_name='traces'),
    propagator=google_cloud_format.GoogleCloudFormatPropagator(),
    sampler=ProbabilitySampler(rate=0.5),
)

with tracer.span(name='parent'):
    with tracer.span(name='child'):
        response = requests.get('http://localhost:5000')

You can use a configuration file for Flask/Django/Pyramid. For more information, please read the individual integration documentation <#integration>_.

.. code:: python

'OPENCENSUS': {
    'TRACE': {
        'EXCLUDELIST_HOSTNAMES': ['localhost', '127.0.0.1'],
        'EXCLUDELIST_PATHS': ['_ah/health'],
        'SAMPLER': 'opencensus.trace.samplers.ProbabilitySampler(rate=1)',
        'EXPORTER': '''opencensus.ext.ocagent.trace_exporter.TraceExporter(
            service_name='foobar',
        )''',
        'PROPAGATOR': 'opencensus.trace.propagation.google_cloud_format.GoogleCloudFormatPropagator()',
    }
}

Extensions

Integration

OpenCensus supports integration with popular web frameworks, client libraries and built-in libraries.

Django_
Flask_
gevent_
Google Cloud Client Libraries_
gRPC_
httplib_
logging_
MySQL_
PostgreSQL_
pymongo_
PyMySQL_
Pyramid_
requests_
SQLAlchemy_
threading_

Log Exporter

Azure_

Metrics Exporter

Azure_

Stats Exporter

OCAgent_
Prometheus_
Stackdriver_

Trace Exporter

Azure_
Datadog_
Jaeger_
OCAgent_
Stackdriver_
Zipkin_

Versioning

This library follows Semantic Versioning_.

GA: Libraries defined at a GA quality level are stable, and will not introduce backwards-incompatible changes in any minor or patch releases. We will address issues and requests with the highest priority. If we were to make a backwards-incompatible changes on an API, we will first mark the existing API as deprecated and keep it for 18 months before removing it.

Beta: Libraries defined at a Beta quality level are expected to be mostly stable and we're working towards their release candidate. We will address issues and requests with a higher priority. There may be backwards incompatible changes in a minor version release, though not in a patch release. If an element is part of an API that is only meant to be used by exporters or other opencensus libraries, then there is no deprecation period. Otherwise, we will deprecate it for 18 months before removing it, if possible.

.. _Semantic Versioning: https://semver.org/

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