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https://github.com/census-instrumentation/opencensus-python

A stats collection and distributed tracing framework
https://github.com/census-instrumentation/opencensus-python
Last synced: 26 days ago
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A stats collection and distributed tracing framework
Host: GitHub
URL: https://github.com/census-instrumentation/opencensus-python
Owner: census-instrumentation
License: apache-2.0
Created: 2017-07-07T22:28:28.000Z (over 7 years ago)
Default Branch: master
Last Pushed: 2024-04-09T02:28:27.000Z (8 months ago)
Last Synced: 2024-11-15T16:09:58.396Z (27 days ago)
Language: Python
Homepage:
Size: 2.43 MB
Stars: 669
Watchers: 39
Forks: 250
Open Issues: 214
Metadata Files:
- Readme: README.rst
- Changelog: CHANGELOG.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
- Codeowners: .github/CODEOWNERS
Awesome Lists containing this project

awesome-google-cloud-operations - PyPI - opencensus
README

        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

--------------------------

1. Install the opencensus package using `pip`_ or `pipenv`_:

    ::

        pip install opencensus

        pipenv install opencensus

2. 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/

3. 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`_

-  `httpx`_

-  `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`_

.. _Azure: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-azure

.. _Datadog: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-datadog

.. _Django: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-django

.. _Flask: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-flask

.. _FastAPI: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-fastapi

.. _gevent: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-gevent

.. _Google Cloud Client Libraries: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-google-cloud-clientlibs

.. _gRPC: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-grpc

.. _httplib: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-httplib

.. _httpx: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-httpx 

.. _Jaeger: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-jaeger

.. _logging: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-logging

.. _MySQL: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-mysql

.. _OCAgent: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-ocagent

.. _PostgreSQL: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-postgresql

.. _Prometheus: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-prometheus

.. _pymongo: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-pymongo

.. _PyMySQL: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-pymysql

.. _Pyramid: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-pyramid

.. _requests: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-requests

.. _SQLAlchemy: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-sqlalchemy

.. _Stackdriver: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-stackdriver

.. _threading: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-threading

.. _Zipkin: https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-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/