Add Implementation of the open-tracing interceptor using gRPC interceptor.

README.md

@@ -11,64 +11,46 @@ pip install grpcio-opentracing
 
 ## Getting started
 
-See the below code for basic usage or [examples/trivial](examples/trivial) for a
+See the below code for basic usage or [examples/hello_world](examples/hello_world) for a
 complete example.
 
 ### Client-side usage example
 
 ```python
+import grpc
 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)
+tracer_interceptor = open_tracing_client_interceptor.OpenTracingClientInterceptor(tracer)
 channel = # the grpc.Channel you created to invoke RPCs
-channel = intercept_channel(channel, interceptor)
+channel = grpc.intercept_channel(channel, tracer_interceptor)
 
 # All future RPC activity involving `channel` will be automatically traced.
 ```
 
 ### Server-side usage example
 
 ```python
+import grpc
+from concurrent import futures
 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)
-
+tracer_interceptor = open_tracing_server_interceptor.OpenTracingServerInterceptor(tracer)
+server = grpc.server(
+    futures.ThreadPoolExecutor(max_workers=10),
+    interceptors=(tracer_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.
-
-```python
-class CustomActiveSpanSource(ActiveSpanSource):
-  @classmethod
-  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.
-
 ```python
-class CustomRpcService(...):
-  ...
-  def Method1(self, request, context):
-    span = context.get_active_span()
-    ...
-```
+from grpc_opentracing import scope
 
-See [examples/integration](examples/integration) for a complete example.
+span = scope.get_active_span()
+span = tracer.start_span("do some thing", child_of=span)
+# do some thing
+span.finish()
+...
+```

examples/hello_world/hello_world.proto

@@ -0,0 +1,23 @@
+syntax = "proto3";
+
+option java_multiple_files = true;
+option java_package = "io.grpc.examples.helloworld";
+option java_outer_classname = "HelloWorldProto";
+
+package helloworld;
+
+// The hello world service definition.
+service Greeter {
+  // Say hello to the request sender (unary-unary)
+  rpc SayHello (HelloRequest) returns (HelloReply) {}
+}
+
+// The request message containing the sender's name.
+message HelloRequest {
+  string name = 1;
+}
+
+// The response message containing the greetings
+message HelloReply {
+  string message = 1;
+}

examples/hello_world/hello_world_client.py

@@ -0,0 +1,50 @@
+from __future__ import print_function
+
+import argparse
+import time
+
+import grpc
+from jaeger_client import Config
+
+import hello_world_pb2
+import hello_world_pb2_grpc
+from grpc_opentracing import open_tracing_client_interceptor
+from grpc_opentracing import scope
+
+HOST_PORT = 'localhost:50051'
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        '--log_payloads',
+        action='store_true',
+        default=True,
+        help='log request/response objects to open-tracing spans')
+    args = parser.parse_args()
+
+    config = Config(
+        config={
+            'sampler': {
+                'type': 'const',
+                'param': 1,
+            },
+            'logging': True,
+        },
+        service_name='hello_world_client')
+    tracer = config.initialize_tracer()
+    tracer_interceptor = open_tracing_client_interceptor.OpenTracingClientInterceptor(
+        tracer,
+        log_payloads=args.log_payloads)
+    with tracer.start_span("step1") as span:
+        scope.set_active_span(span)
+        time.sleep(0.01)
+    channel = grpc.insecure_channel(HOST_PORT)
+    channel = grpc.intercept_channel(channel, tracer_interceptor)
+    stub = hello_world_pb2_grpc.GreeterStub(channel)
+    response = stub.SayHello(hello_world_pb2.HelloRequest(name='you'))
+    print("Message received: " + response.message)
+
+
+if __name__ == '__main__':
+    main()

examples/hello_world/hello_world_pb2_grpc.py

@@ -0,0 +1,46 @@
+# Generated by the gRPC Python protocol compiler plugin. DO NOT EDIT!
+import grpc
+
+import hello_world_pb2 as hello__world__pb2
+
+
+class GreeterStub(object):
+  """The hello world service definition.
+  """
+
+  def __init__(self, channel):
+    """Constructor.
+
+    Args:
+      channel: A grpc.Channel.
+    """
+    self.SayHello = channel.unary_unary(
+        '/helloworld.Greeter/SayHello',
+        request_serializer=hello__world__pb2.HelloRequest.SerializeToString,
+        response_deserializer=hello__world__pb2.HelloReply.FromString,
+        )
+
+
+class GreeterServicer(object):
+  """The hello world service definition.
+  """
+
+  def SayHello(self, request, context):
+    """Say hello to the request sender (unary-unary)
+    """
+    context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+    context.set_details('Method not implemented!')
+    raise NotImplementedError('Method not implemented!')
+
+
+def add_GreeterServicer_to_server(servicer, server):
+  rpc_method_handlers = {
+      'SayHello': grpc.unary_unary_rpc_method_handler(
+          servicer.SayHello,
+          request_deserializer=hello__world__pb2.HelloRequest.FromString,
+          response_serializer=hello__world__pb2.HelloReply.SerializeToString,
+      ),
+  }
+  generic_handler = grpc.method_handlers_generic_handler(
+      'helloworld.Greeter', rpc_method_handlers)
+  server.add_generic_rpc_handlers((generic_handler,))