Python Sanic

As of Apr 2024, OpenTelemetry does not provide auto-instrumentation for Sanic. That said, a fully functional Sanic instrumentation can be achieved as follows.

Prerequisites

Python 3

Installation

1. Install dependencies:

   pip install opentelemetry-distro opentelemetry-exporter-otlp-proto-http
   opentelemetry-bootstrap -a install

2. Create a file tracing.py in your project directory, with the following content:

   tracing.py

   import os
   from opentelemetry import trace, context
   from opentelemetry.semconv.resource import ResourceAttributes
   from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
   from opentelemetry.propagate import extract
   from opentelemetry.sdk.trace import TracerProvider, Resource
   from opentelemetry.sdk.trace.export import (
      BatchSpanProcessor,
      ConsoleSpanExporter,
      SimpleSpanProcessor,
   )
   from opentelemetry.semconv.trace import SpanAttributes
   from opentelemetry.trace.status import Status, StatusCode
   from sanic import HTTPResponse, Request, Sanic
   from socket import gethostname
   
   def instrument_app(app: Sanic):
      provider = TracerProvider(resource=Resource({
         ResourceAttributes.SERVICE_NAME: os.environ['OTEL_SERVICE_NAME'],
         ResourceAttributes.HOST_NAME: gethostname() or 'UNSET',
      }))   
      if os.getenv('OTEL_LOG_LEVEL', '') == 'debug':
         processor = SimpleSpanProcessor(ConsoleSpanExporter())
      else:
         processor = BatchSpanProcessor(OTLPSpanExporter())
      provider.add_span_processor(processor)
      trace.set_tracer_provider(provider)
      tracer = trace.get_tracer(__name__)
   
      SPAN_KEY = 'span_key'
      ACTIVATION_KEY = 'activation_key'
   
      @app.on_request
      async def on_request(req: Request):
         context.attach(extract(req.headers))
         span = tracer.start_span(
               req.method + ' ' + (('/' + req.route.path) if req.route else req.path),
               kind=trace.SpanKind.SERVER,
         )
         activation = trace.use_span(span, end_on_exit=True)
         activation.__enter__()
         span.set_attribute(SpanAttributes.HTTP_METHOD, req.method)
         span.set_attribute(SpanAttributes.HTTP_ROUTE, req.path)
         req.ctx.cubeapm = {ACTIVATION_KEY: activation, SPAN_KEY: span}
   
      @app.on_response
      async def on_response(req: Request, res: HTTPResponse):
         if hasattr(req.ctx, 'cubeapm'):
               req.ctx.cubeapm[SPAN_KEY].set_attribute(
                  SpanAttributes.HTTP_STATUS_CODE, res.status)
               req.ctx.cubeapm[ACTIVATION_KEY].__exit__(None, None, None)
   
      @app.signal('http.lifecycle.exception')
      async def on_exception(request:  Request, exception: Exception):
         if hasattr(request.ctx, 'cubeapm'):
            request.ctx.cubeapm[SPAN_KEY].record_exception(exception)
            request.ctx.cubeapm[SPAN_KEY].set_status(Status(StatusCode.ERROR))

3. Add the highlighted lines below to your project's main file:

   server.py

   from sanic import Sanic
   from sanic.response import text
   from tracing import instrument_app
   
   app = Sanic("CubeAPMTestApp")
   instrument_app(app)
   # Additional instrumentations can be enabled by
   # following the docs for respective instrumentations at
   # https://github.com/open-telemetry/opentelemetry-python-contrib/tree/main/instrumentation
   #
   # A working example with multiple instrumentations is available at
   # https://github.com/cubeapm/sample_app_python_sanic
   
   @app.get("/")
   async def handler(request):
      return text(str(request.id))

4. Modify the application run command as follows:

   OTEL_METRICS_EXPORTER=none \
   OTEL_LOGS_EXPORTER=none \
   OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=http://<ip_address_of_cubeapm_server>:4318/v1/traces \
   OTEL_EXPORTER_OTLP_COMPRESSION=gzip \
   OTEL_SERVICE_NAME=<app_name> \
   sanic server

Troubleshooting

The following can be used for debugging:

OTEL_LOG_LEVEL=debug

The following command can be tried on the application host server to check connectivity to CubeAPM server(s):

telnet <ip_address_of_cubeapm_server> 4318