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https://github.com/aio-libs/aiozipkin

Distributed tracing instrumentation for asyncio with zipkin
https://github.com/aio-libs/aiozipkin

aiohttp async-await asyncio dapper distributed-tracing jaeger mypy stackdriver zipkin

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Distributed tracing instrumentation for asyncio with zipkin

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README 

        
aiozipkin

=========

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**aiozipkin** is Python 3.6+ module that adds distributed tracing capabilities

from asyncio_ applications with zipkin (http://zipkin.io) server instrumentation.



zipkin_ is a distributed tracing system. It helps gather timing data needed

to troubleshoot latency problems in microservice architectures. It manages

both the collection and lookup of this data. Zipkin’s design is based on

the Google Dapper paper.



Applications are instrumented with  **aiozipkin** report timing data to zipkin_.

The Zipkin UI also presents a Dependency diagram showing how many traced

requests went through each application. If you are troubleshooting latency

problems or errors, you can filter or sort all traces based on the

application, length of trace, annotation, or timestamp.



.. image:: https://raw.githubusercontent.com/aio-libs/aiozipkin/master/docs/zipkin_animation2.gif

    :alt: zipkin ui animation



Features

========

* Distributed tracing capabilities to **asyncio** applications.

* Support zipkin_ ``v2`` protocol.

* Easy to use API.

* Explicit context handling, no thread local variables.

* Can work with jaeger_ and stackdriver_ through zipkin compatible API.



zipkin vocabulary

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

Before code lets learn important zipkin_ vocabulary, for more detailed

information please visit https://zipkin.io/pages/instrumenting



.. image:: https://raw.githubusercontent.com/aio-libs/aiozipkin/master/docs/zipkin_glossary.png

    :alt: zipkin ui glossary



* **Span** represents one specific method (RPC) call

* **Annotation** string data associated with a particular timestamp in span

* **Tag** - key and value associated with given span

* **Trace** - collection of spans, related to serving particular request



Simple example

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



.. code:: python



    import asyncio

    import aiozipkin as az



    async def run():

        # setup zipkin client

        zipkin_address = 'http://127.0.0.1:9411/api/v2/spans'

        endpoint = az.create_endpoint(

            "simple_service", ipv4="127.0.0.1", port=8080)

        tracer = await az.create(zipkin_address, endpoint, sample_rate=1.0)



        # create and setup new trace

        with tracer.new_trace(sampled=True) as span:

            # give a name for the span

            span.name("Slow SQL")

            # tag with relevant information

            span.tag("span_type", "root")

            # indicate that this is client span

            span.kind(az.CLIENT)

            # make timestamp and name it with START SQL query

            span.annotate("START SQL SELECT * FROM")

            # imitate long SQL query

            await asyncio.sleep(0.1)

            # make other timestamp and name it "END SQL"

            span.annotate("END SQL")



        await tracer.close()



    if __name__ == "__main__":

        loop = asyncio.get_event_loop()

        loop.run_until_complete(run())



aiohttp example

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



*aiozipkin* includes *aiohttp* server instrumentation, for this create

`web.Application()` as usual and install aiozipkin plugin:



.. code:: python



    import aiozipkin as az



    def init_app():

        host, port = "127.0.0.1", 8080

        app = web.Application()

        endpoint = az.create_endpoint("AIOHTTP_SERVER", ipv4=host, port=port)

        tracer = await az.create(zipkin_address, endpoint, sample_rate=1.0)

        az.setup(app, tracer)



That is it, plugin adds middleware that tries to fetch context from headers,

and create/join new trace. Optionally on client side you can add propagation

headers in order to force tracing and to see network latency between client and

server.



.. code:: python



    import aiozipkin as az



    endpoint = az.create_endpoint("AIOHTTP_CLIENT")

    tracer = await az.create(zipkin_address, endpoint)



    with tracer.new_trace() as span:

        span.kind(az.CLIENT)

        headers = span.context.make_headers()

        host = "http://127.0.0.1:8080/api/v1/posts/{}".format(i)

        resp = await session.get(host, headers=headers)

        await resp.text()



Documentation

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

http://aiozipkin.readthedocs.io/



Installation

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

Installation process is simple, just::



    $ pip install aiozipkin



Support of other collectors

===========================

**aiozipkin** can work with any other zipkin_ compatible service, currently we

tested it with jaeger_ and stackdriver_.



Jaeger support

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

jaeger_ supports zipkin_ span format as result it is possible to use *aiozipkin*

with jaeger_ server. You just need to specify *jaeger* server address and it

should work out of the box. Not need to run local zipkin server.

For more informations see tests and jaeger_ documentation.



.. image:: https://raw.githubusercontent.com/aio-libs/aiozipkin/master/docs/jaeger.png

    :alt: jaeger ui animation



Stackdriver support

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

Google stackdriver_ supports zipkin_ span format as result it is possible to

use *aiozipkin* with this google_ service. In order to make this work you

need to setup zipkin service locally, that will send trace to the cloud. See

google_ cloud documentation how to setup make zipkin collector:



.. image:: https://raw.githubusercontent.com/aio-libs/aiozipkin/master/docs/stackdriver.png

    :alt: jaeger ui animation



Requirements

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



* Python_ 3.6+

* aiohttp_



.. _PEP492: https://www.python.org/dev/peps/pep-0492/

.. _Python: https://www.python.org

.. _aiohttp: https://github.com/KeepSafe/aiohttp

.. _asyncio: http://docs.python.org/3.5/library/asyncio.html

.. _uvloop: https://github.com/MagicStack/uvloop

.. _zipkin: http://zipkin.io

.. _jaeger: http://jaeger.readthedocs.io/en/latest/

.. _stackdriver: https://cloud.google.com/stackdriver/

.. _google: https://cloud.google.com/trace/docs/zipkin