Added integration support for DataDog APM Tracing

middlewares/tracing/datadog/datadog.go

@@ -0,0 +1,45 @@
+package datadog
+
+import (
+	"io"
+	"strings"
+
+	"github.com/containous/traefik/log"
+	"github.com/opentracing/opentracing-go"
+	ddtracer "gopkg.in/DataDog/dd-trace-go.v1/ddtrace/opentracer"
+	datadog "gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
+)
+
+// Name sets the name of this tracer
+const Name = "datadog"
+
+// Config provides configuration settings for a datadog tracer
+type Config struct {
+	LocalAgentHostPort string `description:"Set datadog-agent's host:port that the reporter will used. Defaults to localhost:8126" export:"false"`
+	GlobalTag          string `description:"Key:Value tag to be set on all the spans." export:"true"`
+	Debug              bool   `description:"Enable DataDog debug." export:"true"`
+}
+
+// Setup sets up the tracer
+func (c *Config) Setup(serviceName string) (opentracing.Tracer, io.Closer, error) {
+	tag := strings.SplitN(c.GlobalTag, ":", 2)
+
+	value := ""
+	if len(tag) == 2 {
+		value = tag[1]
+	}
+
+	tracer := ddtracer.New(
+		datadog.WithAgentAddr(c.LocalAgentHostPort),
+		datadog.WithServiceName(serviceName),
+		datadog.WithGlobalTag(tag[0], value),
+		datadog.WithDebugMode(c.Debug),
+	)
+
+	// Without this, child spans are getting the NOOP tracer
+	opentracing.SetGlobalTracer(tracer)
+
+	log.Debug("DataDog tracer configured")
+
+	return tracer, nil, nil
+}

middlewares/tracing/tracing.go

@@ -6,6 +6,7 @@ import (
 	"net/http"
 
 	"github.com/containous/traefik/log"
+	"github.com/containous/traefik/middlewares/tracing/datadog"
 	"github.com/containous/traefik/middlewares/tracing/jaeger"
 	"github.com/containous/traefik/middlewares/tracing/zipkin"
 	"github.com/opentracing/opentracing-go"
@@ -14,10 +15,11 @@ import (
 
 // Tracing middleware
 type Tracing struct {
-	Backend     string         `description:"Selects the tracking backend ('jaeger','zipkin')." export:"true"`
-	ServiceName string         `description:"Set the name for this service" export:"true"`
-	Jaeger      *jaeger.Config `description:"Settings for jaeger"`
-	Zipkin      *zipkin.Config `description:"Settings for zipkin"`
+	Backend     string          `description:"Selects the tracking backend ('jaeger','zipkin', 'datadog')." export:"true"`
+	ServiceName string          `description:"Set the name for this service" export:"true"`
+	Jaeger      *jaeger.Config  `description:"Settings for jaeger"`
+	Zipkin      *zipkin.Config  `description:"Settings for zipkin"`
+	DataDog     *datadog.Config `description:"Settings for DataDog"`
 
 	tracer opentracing.Tracer
 	closer io.Closer
@@ -52,6 +54,8 @@ func (t *Tracing) Setup() {
 		t.tracer, t.closer, err = t.Jaeger.Setup(t.ServiceName)
 	case zipkin.Name:
 		t.tracer, t.closer, err = t.Zipkin.Setup(t.ServiceName)
+	case datadog.Name:
+		t.tracer, t.closer, err = t.DataDog.Setup(t.ServiceName)
 	default:
 		log.Warnf("Unknown tracer %q", t.Backend)
 		return