Add opencensus propagation readme and example

.github/dependabot.yml

@@ -417,6 +417,16 @@ updates:
  schedule:
  interval: "weekly"
  day: "sunday"
+ -
+ package-ecosystem: "gomod"
+ directory: "/propagators/opencensus/examples"
+ labels:
+ - dependencies
+ - go
+ - "Skip Changelog"
+ schedule:
+ interval: "weekly"
+ day: "sunday"
  - package-ecosystem: "gomod"
  directory: "/tools"
  labels:

propagators/opencensus/README.md

@@ -0,0 +1,17 @@
+# OpenCensus Binary Propagation Format
+
+## The Problem
+
+The [ocgrpc](https:/census-instrumentation/opencensus-go/tree/master/plugin/ocgrpc) GRPC plugin for OpenCensus is hard-coded to use a [Binary propagation format](https:/census-instrumentation/opencensus-go/blob/380f4078db9f3ee20e26a08105ceecccddf872b8/trace/propagation/propagation.go).
+
+A GRPC client and server that use OpenCensus cannot easily migrate to OpenTelemetry because there will be a period of time during which one will use OpenCensus and the other will use OpenTelemetry. If both client and server export spans to the same trace backend, the server spans will not be a child of the client spans, because they are using different propagation formats. To be able to easily migrate from OpenCensus to OpenTelemetry, it is necessary to use the OpenCensus binary propagation format with OpenTelemetry.
+
+## Usage
+
+To add the binary propagation format with otelgrpc, use the WithPropagators option to the otelgrpc Interceptors:
+
+```golang
+import "go.opentelemetry.io/contrib/propagation/opencensus"
+
+opt := otelgrpc.WithPropagators(opencensus.Binary{})
+```

propagators/opencensus/examples/README.md

@@ -0,0 +1,52 @@
+# OpenCensus binary propagation example
+
+The server uses OpenTelemetry with the OpenCensus binary propagation format.
+The client uses OpenCensus, which is hard-coded to use the OpenCensus binary
+propagation format. Since the client and server use the same propagation
+format, the ParentSpanID from the server spans should match the SpanID from
+the client spans, and both should share the same TraceID.
+
+### Usage
+
+First, start the opentelemetry server:
+```bash
+go run opentelemetry_server/server.go
+```
+
+In another shell, start the OpenCensus client:
+```bash
+go run opencensus_client/client.go
+```
+
+### Example Client Output
+
+```
+Configuring OpenCensus, and registering the Print exporter.
+
+TraceID: 9d59b1bdbde34cdaac6cfb5b8f3c4685
+SpanID: 07733a2559ef492d
+...
+Greeting: Hello world
+```
+
+Note that there is no ParentSpanID listed in the client.
+
+### Example Server Output
+
+```
+Registering opentelemetry stdout exporter.
+Starting the GRPC server, and using the OpenCensus binary propagation format.
+[
+ {
+ "SpanContext": {
+ "TraceID": "9d59b1bdbde34cdaac6cfb5b8f3c4685",
+ "SpanID": "94738571415fdb63",
+ "TraceFlags": 1
+ },
+ "ParentSpanID": "07733a2559ef492d",
+ ...
+ }
+]
+```
+
+The TraceID matches the TraceID from the OpenCensus client span, and the ParentSpanID matches the SpanID of the OpenCensus client span.

propagators/opencensus/examples/go.mod

@@ -0,0 +1,15 @@
+module go.opentelemetry.io/contrib/propagators/opencensus/examples
+
+go 1.14
+
+require (
+ go.opencensus.io v0.22.6-0.20201102222123-380f4078db9f
+ go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.14.0
+ go.opentelemetry.io/contrib/propagation/opencensus v0.14.0
+ go.opentelemetry.io/otel v0.14.0
+ go.opentelemetry.io/otel/exporters/stdout v0.14.0
+ go.opentelemetry.io/otel/sdk v0.14.0
+ google.golang.org/grpc v1.33.2
+)
+
+replace go.opentelemetry.io/contrib/propagation/opencensus => ../

propagators/opencensus/examples/go.sum

@@ -0,0 +1,132 @@
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propagators/opencensus/examples/opencensus_client/client.go

@@ -0,0 +1,63 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+ "context"
+ "log"
+ "os"
+ "time"
+
+ "go.opencensus.io/examples/exporter"
+ pb "go.opencensus.io/examples/grpc/proto"
+ "go.opencensus.io/plugin/ocgrpc"
+ "go.opencensus.io/trace"
+ "google.golang.org/grpc"
+)
+
+const (
+ address = "localhost:50051"
+ defaultName = "world"
+)
+
+func main() {
+ log.Println("Configuring OpenCensus, and registering the Print exporter.")
+ trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
+ trace.RegisterExporter(&exporter.PrintExporter{})
+
+ // Set up a connection to the server with the OpenCensus
+ // stats handler to enable tracing.
+ conn, err := grpc.Dial(address, grpc.WithStatsHandler(&ocgrpc.ClientHandler{}), grpc.WithInsecure())
+ if err != nil {
+ log.Fatalf("Cannot connect: %v", err)
+ }
+ defer conn.Close()
+ c := pb.NewGreeterClient(conn)
+
+ // Contact the server and print out its response.
+ name := defaultName
+ if len(os.Args) > 1 {
+ name = os.Args[1]
+ }
+ for {
+ r, err := c.SayHello(context.Background(), &pb.HelloRequest{Name: name})
+ if err != nil {
+ log.Printf("Could not greet: %v", err)
+ } else {
+ log.Printf("Greeting: %s", r.Message)
+ }
+ time.Sleep(2 * time.Second)
+ }
+}