Update OTLP auth example (#803)

* Update OTLP GCP auth sample * Add http OTLP auth sample * Use env var config settings
GoogleCloudPlatform · Feb 23, 2024 · 87124ac · 87124ac
1 parent babed48
commit 87124ac
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diff --git a/example/trace/otlpgrpc/example.go b/example/trace/otlpgrpc/example.go
@@ -39,6 +39,9 @@ func initTracer() (func(), error) {
 		panic(err)
 	}
 
+	// set OTEL_RESOURCE_ATTRIBUTES="gcp.project_id=<project_id>"
+	// set endpoint with OTEL_EXPORTER_OTLP_ENDPOINT=https://<endpoint>
+	// set OTEL_EXPORTER_OTLP_HEADERS="x-goog-user-project=<project_id>"
 	exporter, err := otlptracegrpc.New(ctx, otlptracegrpc.WithDialOption(grpc.WithPerRPCCredentials(creds)))
 	if err != nil {
 		panic(err)

diff --git a/example/trace/otlphttp/example.go b/example/trace/otlphttp/example.go
@@ -0,0 +1,87 @@
+// Copyright 2019 OpenTelemetry Authors
+// Copyright 2024 Google LLC
+//
+// 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"
+	"fmt"
+	"log"
+	"os"
+	"time"
+
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	semconv "go.opentelemetry.io/otel/semconv/v1.24.0"
+	"go.opentelemetry.io/otel/trace"
+
+	"golang.org/x/oauth2/google"
+)
+
+func initTracer(projectID string) (func(), error) {
+	ctx := context.Background()
+
+	creds, err := google.FindDefaultCredentials(ctx)
+	if err != nil {
+		panic(err)
+	}
+	token, err := creds.TokenSource.Token()
+	if err != nil {
+		panic(err)
+	}
+
+	// set OTEL_RESOURCE_ATTRIBUTES="gcp.project_id=<project_id>"
+	// set endpoint with OTEL_EXPORTER_OTLP_ENDPOINT=https://<endpoint>
+	exporter, err := otlptracehttp.New(ctx, otlptracehttp.WithHeaders(map[string]string{
+		"Authorization":       fmt.Sprintf("Bearer %s", token.AccessToken),
+		"x-goog-user-project": projectID,
+	}))
+	if err != nil {
+		panic(err)
+	}
+
+	tp := sdktrace.NewTracerProvider(
+		// For this example code we use sdktrace.AlwaysSample sampler to sample all traces.
+		// In a production application, use sdktrace.ProbabilitySampler with a desired probability.
+		sdktrace.WithSampler(sdktrace.AlwaysSample()),
+		sdktrace.WithBatcher(exporter))
+
+	otel.SetTracerProvider(tp)
+	return func() {
+		err := tp.Shutdown(context.Background())
+		if err != nil {
+			fmt.Printf("error shutting down trace provider: %+v", err)
+		}
+	}, nil
+}
+
+func main() {
+	projectID := os.Getenv("GCLOUD_PROJECT")
+	shutdown, err := initTracer(projectID)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer shutdown()
+	tr := otel.Tracer("cloudtrace/example/client")
+
+	ctx := context.Background()
+	fmt.Println("starting span...")
+	_, span := tr.Start(ctx, "test span", trace.WithAttributes(semconv.PeerServiceKey.String("ExampleService")))
+	defer span.End()
+	defer fmt.Println("ending span.")
+
+	time.Sleep(3 * time.Second)
+}
diff --git a/example/trace/otlphttp/go.mod b/example/trace/otlphttp/go.mod
@@ -0,0 +1,32 @@
+module github.com/GoogleCloudPlatform/opentelemetry-operations-go/example/trace/otlphttp
+
+go 1.21
+
+require (
+	go.opentelemetry.io/otel v1.23.1
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.23.1
+	go.opentelemetry.io/otel/sdk v1.23.1
+	go.opentelemetry.io/otel/trace v1.23.1
+	golang.org/x/oauth2 v0.15.0
+)
+
+require (
+	cloud.google.com/go/compute v1.23.3 // indirect
+	cloud.google.com/go/compute/metadata v0.2.3 // indirect
+	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
+	github.com/go-logr/logr v1.4.1 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.19.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.23.1 // indirect
+	go.opentelemetry.io/otel/metric v1.23.1 // indirect
+	go.opentelemetry.io/proto/otlp v1.1.0 // indirect
+	golang.org/x/net v0.19.0 // indirect
+	golang.org/x/sys v0.16.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	google.golang.org/appengine v1.6.8 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20240102182953-50ed04b92917 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240102182953-50ed04b92917 // indirect
+	google.golang.org/grpc v1.61.0 // indirect
+	google.golang.org/protobuf v1.32.0 // indirect
+)
diff --git a/example/trace/otlphttp/go.sum b/example/trace/otlphttp/go.sum
@@ -0,0 +1,89 @@
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