buildkit/vendor/github.com/grpc-ecosystem/grpc-opentracing/python

OpenTracing support for gRPC in Python

The grpcio-opentracing package makes it easy to add OpenTracing support to gRPC-based systems in Python.

Installation

pip install grpcio-opentracing

Getting started

See the below code for basic usage or examples/trivial for a complete example.

Client-side usage example

from grpc_opentracing import open_tracing_client_interceptor
from grpc_opentracing.grpcext import intercept_channel

tracer = # some OpenTracing Tracer instance
interceptor = open_tracing_client_interceptor(tracer)
channel = # the grpc.Channel you created to invoke RPCs
channel = intercept_channel(channel, interceptor)

# All future RPC activity involving `channel` will be automatically traced.

Server-side usage example

from grpc_opentracing import open_tracing_server_interceptor
from grpc_opentracing.grpcext import intercept_server

tracer = # some OpenTracing Tracer instance
interceptor = open_tracing_server_interceptor(tracer)
server = # the grpc.Server you created to receive RPCs
server = intercept_server(server, interceptor)

# All future RPC activity involving `server` will be automatically traced.

Integrating with other spans.

grpcio-opentracing provides features that let you connect its span with other tracing spans. On the client-side, you can write a class that derives from ActiveSpanSource and provide it when creating the interceptor.

class CustomActiveSpanSource(ActiveSpanSource):
  def get_active_span(self):
    # your custom method of getting the active span
tracer = # some OpenTracing Tracer instance
interceptor = open_tracing_client_interceptor(
                  tracer,
                  active_span_source=CustomActiveSpanSource)
...

On the server-side, the context argument passed into your service methods packages the gRPC span created on the server-side.

class CustomRpcService(...):
  ...
  def Method1(self, request, context):
    span = context.get_active_span()
    ...

See examples/integration for a complete example.