Add OTLP trace

example/README.md

@@ -1,4 +1,9 @@
 # Example
+Here is a collection of OpenTelemtry-Go examples showcasing basic functionality.
+
+## OTLP
+This example demonstrates how to export trace and metric data from an
+application using OpenTelemetry's own wire protocal OTLP. 
 
 ## HTTP
 This is a simple example that demonstrates tracing http request from client to server. The example

example/otlp/go.mod

@@ -0,0 +1,8 @@
+module github.com/wtong98/otel-test
+
+go 1.14
+
+require (
+	github.com/open-telemetry/opentelemetry-collector v0.3.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp v0.6.0 // indirect
+)

example/otlp/main.go

@@ -0,0 +1,62 @@
+// dummy application for testing opentelemetry Go agent + collector
+
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	// "github.com/open-telemetry/opentelemetry-collector/translator/conventions"
+
+	"go.opentelemetry.io/otel/api/global"
+	// "go.opentelemetry.io/otel/api/kv"
+	// "go.opentelemetry.io/otel/api/metric"
+	"go.opentelemetry.io/otel/exporters/otlp"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	// tracestdout "go.opentelemetry.io/otel/exporters/trace/stdout"
+)
+
+func initExporter() {
+	exp, err := otlp.NewExporter(
+		otlp.WithInsecure(),
+		otlp.WithAddress("localhost:55680"),
+	)
+	// exp, err := tracestdout.NewExporter(tracestdout.Options{PrettyPrint: true})
+	handleErr(err, "Failed to create exporter: $v")
+
+	// defer handleErr(exp.Stop(), "Failed to stop exporter: %v")
+
+	provider, err := sdktrace.NewProvider(
+		sdktrace.WithConfig(sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()}),
+        sdktrace.WithSyncer(exp),
+	)
+	handleErr(err, "Failed to create trace provider: %v")
+
+	global.SetTraceProvider(provider)
+}
+
+func main() {
+	initExporter()
+	tracer := global.Tracer("mage-sense")
+
+	ctx, span := tracer.Start(context.Background(), "Archmage-Overlord")
+	for i := 0; i < 10; i++ {
+		_, innerSpan := tracer.Start(ctx, fmt.Sprintf("Minion-%d", i))
+		log.Println("Minions hard at work, scribing...")
+		<-time.After(time.Second)
+		innerSpan.End()
+	}
+
+	span.End()
+	<-time.After(time.Second)
+
+    log.Println("Spell-scroll scribed!")
+}
+
+func handleErr(err error, message string) {
+	if err != nil {
+		log.Fatalf(message, err)
+	}
+}

example/preview.html

@@ -0,0 +1,28 @@
+<h1 id="example">Example</h1>
+<h2 id="http">HTTP</h2>
+<p>This is a simple example that demonstrates tracing http request from client to server. The example shows key aspects of tracing such as:</p>
+<ul>
+<li>Root Span (on Client)</li>
+<li>Child Span (on Client)</li>
+<li>Child Span from a Remote Parent (on Server)</li>
+<li>SpanContext Propagation (from Client to Server)</li>
+<li>Span Events</li>
+<li>Span Attributes</li>
+</ul>
+<p>Example uses - open-telemetry SDK as trace instrumentation provider, - httptrace plugin to facilitate tracing http request on client and server - http trace_context propagation to propagate SpanContext on the wire. - stdout exporter to print information about spans in the terminal</p>
+<h3 id="how-to-run">How to run?</h3>
+<h4 id="prequisites">Prequisites</h4>
+<ul>
+<li>go 1.13 installed</li>
+<li>GOPATH is configured.</li>
+</ul>
+<h4 id="download-git-repo">1 Download git repo</h4>
+<pre><code>GO111MODULE=&quot;&quot; go get -d go.opentelemetry.io/otel</code></pre>
+<h4 id="start-server">2 Start Server</h4>
+<pre><code>cd $GOPATH/src/go.opentelemetry.io/otel/example/http/
+go run ./server/server.go</code></pre>
+<h4 id="start-client">3 Start Client</h4>
+<pre><code>cd $GOPATH/src/go.opentelemetry.io/otel/example/http/
+go run ./client/client.go</code></pre>
+<h4 id="check-traces-in-stdout">4 Check traces in stdout</h4>
+<p>The spans should be visible in stdout in the order that they were exported.</p>