[Tracing] Add test and endpoints to test OTEL Drop-In Support of the OpenTelemetry Propagators API

manifests/cpp.yml

@@ -145,7 +145,8 @@ tests/:
     test_inferred_proxy.py:
       Test_AWS_API_Gateway_Inferred_Span_Creation: missing_feature
     test_otel_drop_in.py:
-      Test_Otel_Drop_In: missing_feature
+      Test_Otel_Drop_In: irrelevant (library does not implement OpenTelemetry)
+      Test_Otel_Drop_In_Default_Propagator: irrelevant (library does not implement OpenTelemetry)
   parametric/:
     test_128_bit_traceids.py:
       Test_128_Bit_Traceids: missing_feature (parametric app does not support trace/span/extract endpoint)

manifests/dotnet.yml

@@ -409,6 +409,7 @@ tests/:
       Test_AWS_API_Gateway_Inferred_Span_Creation: missing_feature
     test_otel_drop_in.py:
       Test_Otel_Drop_In: missing_feature
+      Test_Otel_Drop_In_Default_Propagator: v3.9.0
   parametric/:
     test_config_consistency.py:
       Test_Config_Dogstatsd: missing_feature (does not support hostname)

manifests/golang.yml

@@ -517,6 +517,9 @@ tests/:
       Test_AWS_API_Gateway_Inferred_Span_Creation: missing_feature
     test_otel_drop_in.py:
       Test_Otel_Drop_In: missing_feature
+      Test_Otel_Drop_In_Default_Propagator:
+        '*': irrelevant
+        net-http: v1.70.1
   parametric/:
     test_config_consistency.py:
       Test_Config_Dogstatsd: v1.72.0-dev

manifests/java.yml

@@ -1595,6 +1595,9 @@ tests/:
       Test_Otel_Drop_In:
         '*': missing_feature
         spring-boot: v1.39.0
+      Test_Otel_Drop_In_Default_Propagator:
+        '*': missing_feature
+        spring-boot: v1.39.0
     test_sql.py:
       Test_Sql: bug (APMAPI-729)
   parametric/:

manifests/nodejs.yml

@@ -780,6 +780,10 @@ tests/:
         express5: *ref_5_26_0
     test_otel_drop_in.py:
       Test_Otel_Drop_In: missing_feature
+      Test_Otel_Drop_In_Default_Propagator:
+        '*': irrelevant
+        express4: *ref_5_26_0
+        express5: *ref_5_26_0
   parametric/:
     test_128_bit_traceids.py:
       Test_128_Bit_Traceids: *ref_3_0_0

manifests/php.yml

@@ -382,6 +382,7 @@ tests/:
       Test_AWS_API_Gateway_Inferred_Span_Creation: missing_feature
     test_otel_drop_in.py:
       Test_Otel_Drop_In: missing_feature
+      Test_Otel_Drop_In_Default_Propagator: incomplete_test_app (endpoint not implemented)
   parametric/:
     test_128_bit_traceids.py:
       Test_128_Bit_Traceids: v0.84.0

manifests/python.yml

@@ -760,6 +760,9 @@ tests/:
       Test_AWS_API_Gateway_Inferred_Span_Creation: missing_feature
     test_otel_drop_in.py:
       Test_Otel_Drop_In: missing_feature
+      Test_Otel_Drop_In_Default_Propagator:
+        '*': irrelevant
+        flask-poc: v2.19.0
   parametric/:
     test_128_bit_traceids.py:
       Test_128_Bit_Traceids: v2.6.0

manifests/ruby.yml

@@ -400,6 +400,9 @@ tests/:
       Test_AWS_API_Gateway_Inferred_Span_Creation: missing_feature
     test_otel_drop_in.py:
       Test_Otel_Drop_In: missing_feature
+      Test_Otel_Drop_In_Default_Propagator:
+        '*': irrelevant (endpoint not implemented)
+        rails70: v2.0.0
   k8s_lib_injection/:
     test_k8s_lib_injection_profiling.py:
       TestK8sLibInjectioProfilingClusterEnabled: missing_feature

tests/integrations/test_otel_drop_in.py

@@ -2,7 +2,8 @@
 # This product includes software developed at Datadog (https://www.datadoghq.com/).
 # Copyright 2024 Datadog, Inc.
 
-from utils import weblog, interfaces, scenarios, features
+import json
+from utils import weblog, interfaces, scenarios, features, incomplete_test_app
 
 
 @features.f_otel_interoperability
@@ -39,3 +40,38 @@ def has_otel_library_tag(tags):
                 span_metric_found = True
                 break
         assert span_metric_found, "Otel drop-in span metric not found"
+
+
+@features.f_otel_interoperability
+@scenarios.apm_tracing_e2e_otel
+class Test_Otel_Drop_In_Default_Propagator:
+    def setup_propagation_extract(self):
+        extract_headers = {
+            "traceparent": "00-11111111111111110000000000000002-000000000000000a-01",
+            "tracestate": "dd=s:2;p:000000000000000a,foo=1",
+            "baggage": "foo=1",
+        }
+        self.r = weblog.get("/otel_drop_in_default_propagator_extract", headers=extract_headers)
+
+    @incomplete_test_app(library="nodejs", reason="Node.js extract endpoint doesn't seem to be working.")
+    @incomplete_test_app(library="ruby", reason="Ruby extract seems to fail even though it should be supported")
+    def test_propagation_extract(self):
+        content = json.loads(self.r.text)
+
+        assert content["trace_id"] == 2
+        assert content["span_id"] == 10
+        assert content["tracestate"] and not content["tracestate"].isspace()
+        # assert content["baggage"] and not content["baggage"].isspace()
+
+    def setup_propagation_inject(self):
+        inject_headers = {
+            "baggage": "foo=2",
+        }
+        self.r = weblog.get("/otel_drop_in_default_propagator_inject")
+
+    @incomplete_test_app(library="nodejs", reason="Node.js inject endpoint doesn't seem to be working.")
+    def test_propagation_inject(self):
+        content = json.loads(self.r.text)
+
+        assert content["traceparent"] and not content["traceparent"].isspace()
+        # assert content["baggage"] and not content["baggage"].isspace()

utils/build/docker/dotnet/weblog/Endpoints/OtelDropInEndpoint.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text.Json;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Http;
+using OpenTelemetry;
+using OpenTelemetry.Context.Propagation;
+
+namespace weblog
+{
+    public class OtelDropInEndpoint : ISystemTestEndpoint
+    {
+        public void Register(Microsoft.AspNetCore.Routing.IEndpointRouteBuilder routeBuilder)
+        {
+            routeBuilder.MapGet("/otel_drop_in_default_propagator_extract", async context =>
+            {
+                var parentContext = OpenTelemetryInstrumentation.Propagator.Extract(default, context.Request.Headers, (carrier, key) =>
+                {
+                    return carrier.TryGetValue(key, out var value) && value.Count >= 1 ? new[] { value[0] } : null;
+                });
+
+                var ddTraceId = Convert.ToUInt64(parentContext.ActivityContext.TraceId.ToHexString().Substring(16), 16);
+                var ddSpanId = Convert.ToUInt64(parentContext.ActivityContext.SpanId.ToHexString(), 16);
+
+                var data = new
+                {
+                    trace_id = ddTraceId,
+                    span_id = ddSpanId,
+                    tracestate = parentContext.ActivityContext.TraceState,
+                    baggage = parentContext.Baggage
+                };
+
+                await context.Response.WriteAsync(JsonSerializer.Serialize(data));
+            });
+
+            routeBuilder.MapGet("/otel_drop_in_default_propagator_inject", async context =>
+            {
+                var headersDict = new Dictionary<string,string>();
+                OpenTelemetryInstrumentation.Propagator.Inject(new PropagationContext(Activity.Current.Context, Baggage.Current), headersDict, (carrier, key, value) =>
+                {
+                    carrier[key] = value;
+                });
+
+                await context.Response.WriteAsync(JsonSerializer.Serialize(headersDict));
+            });
+        }
+    }
+}

utils/build/docker/dotnet/weblog/OpenTelemetryInstrumentation.cs

@@ -0,0 +1,10 @@
+using System.Diagnostics;
+using OpenTelemetry.Context.Propagation;
+
+namespace weblog
+{
+    public static class OpenTelemetryInstrumentation
+    {
+        public static TextMapPropagator Propagator { get; } = Propagators.DefaultTextMapPropagator;
+    }
+}

utils/build/docker/dotnet/weblog/app.csproj

@@ -44,5 +44,6 @@
         <PackageReference Include="MongoDB.Driver" Version="2.23.1"/>
 
         <PackageReference Include="Datadog.Trace" Version="*" />
+        <PackageReference Include="OpenTelemetry.Api" Version="1.10.0" />
     </ItemGroup>
 </Project>

utils/build/docker/golang/app/net-http/main.go

@@ -32,6 +32,7 @@ import (
 	"go.opentelemetry.io/otel/propagation"
 	"go.opentelemetry.io/otel/trace"
 	oteltrace "go.opentelemetry.io/otel/trace"
+	otelbaggage "go.opentelemetry.io/otel/baggage"
 
 	"gopkg.in/DataDog/dd-trace-go.v1/appsec"
 	httptrace "gopkg.in/DataDog/dd-trace-go.v1/contrib/net/http"
@@ -537,6 +538,79 @@ func main() {
 		w.Write([]byte("ok"))
 	})
 
+	mux.HandleFunc("/otel_drop_in_default_propagator_extract", func(w http.ResponseWriter, r *http.Request) {
+		// Differing from other languages, the user must set the text map propagator because dd-trace-go
+		// doesn't automatically instrument at runtime (not including Orchestrion)
+		otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
+
+		httpCarrier := HttpCarrier{header: r.Header}
+
+		propagator := otel.GetTextMapPropagator()
+		ctx := propagator.Extract(r.Context(), httpCarrier)
+
+		spanContext := oteltrace.SpanContextFromContext(ctx)
+		baggage := otelbaggage.FromContext(ctx)
+
+		base := 16
+		bitSize := 64
+		result := make(map[string]any, 4)
+
+		num, err := strconv.ParseInt(spanContext.TraceID().String()[16:], base, bitSize)
+		if err == nil {
+			result["trace_id"] = num
+		}
+
+		num, err = strconv.ParseInt(spanContext.SpanID().String(), base, bitSize)
+		if err == nil {
+			result["span_id"] = num
+		}
+
+		result["tracestate"] = spanContext.TraceState().String()
+		result["baggage"] = baggage.String()
+
+		jsonData, err := json.Marshal(result)
+		if err != nil {
+			w.WriteHeader(422)
+			w.Write([]byte("failed to convert carrier to JSON"))
+			return
+		}
+
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(200)
+		w.Write(jsonData)
+	})
+
+	mux.HandleFunc("/otel_drop_in_default_propagator_inject", func(w http.ResponseWriter, r *http.Request) {
+		// Differing from other languages, the user must set the text map propagator because dd-trace-go
+		// doesn't automatically instrument at runtime (not including Orchestrion)
+		otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
+
+		ctx := context.Background()
+		p := ddotel.NewTracerProvider()
+		tracer := p.Tracer("")
+		otel.SetTracerProvider(p)
+
+		_, span := tracer.Start(ddotel.ContextWithStartOptions(ctx), "main")
+		newCtx := oteltrace.ContextWithSpan(ctx, span)
+
+		propagator := otel.GetTextMapPropagator()
+		mapCarrier := make(MapCarrier)
+		propagator.Inject(newCtx, mapCarrier)
+
+		jsonData, err := json.Marshal(mapCarrier)
+		span.End()
+
+		if err != nil {
+			w.WriteHeader(422)
+			w.Write([]byte("failed to convert carrier to JSON"))
+			return
+		}
+
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(200)
+		w.Write(jsonData)
+	})
+
 	mux.HandleFunc("/session/new", func(w http.ResponseWriter, r *http.Request) {
 		sessionID := strconv.Itoa(rand.Int())
 		w.Header().Add("Set-Cookie", "session="+sessionID+"; Path=/; Max-Age=3600; Secure; HttpOnly")
@@ -598,6 +672,44 @@ func (c carrier) ForeachKey(handler func(key, val string) error) error {
 	return nil
 }
 
+type MapCarrier map[string]string
+
+func (c MapCarrier) Get(key string) string {
+	return c[key]
+}
+
+func (c MapCarrier) Set(key, val string) {
+	c[key] = val
+}
+
+func (c MapCarrier) Keys() []string {
+	keys := make([]string, 0, len(c))
+	for k := range c {
+		keys = append(keys, k)
+	}
+	return keys
+}
+
+type HttpCarrier struct {
+	header http.Header
+}
+
+func (c HttpCarrier) Get(key string) string {
+	return c.header.Get(key)
+}
+
+func (c HttpCarrier) Set(key, val string) {
+	c.header.Set(key, val)
+}
+
+func (c HttpCarrier) Keys() []string {
+	keys := make([]string, 0, len(c.header))
+	for k := range c.header {
+		keys = append(keys, k)
+	}
+	return keys
+}
+
 func write(w http.ResponseWriter, r *http.Request, d []byte) {
 	span, _ := ddtracer.StartSpanFromContext(r.Context(), "child.span")
 	defer span.Finish()