feat: add request id headers to aws lambda start/end invocation calls

contrib/aws/datadog-lambda-go/internal/extension/extension.go

@@ -21,6 +21,7 @@ import (
 	"time"
 
 	"github.com/DataDog/dd-trace-go/contrib/aws/datadog-lambda-go/v2/internal/logger"
+	"github.com/aws/aws-lambda-go/lambdacontext"
 
 	ddtracer "github.com/DataDog/dd-trace-go/v2/ddtrace/tracer"
 )
@@ -40,6 +41,8 @@ const (
 
 	DdSeverlessSpan  ddTraceContext = "dd-tracer-serverless-span"
 	DdLambdaResponse ddTraceContext = "dd-response"
+
+	lambdaRuntimeAwsRequestIdHeader = "lambda-runtime-aws-request-id"
 )
 
 const (
@@ -116,6 +119,13 @@ func (em *ExtensionManager) checkAgentRunning() {
 func (em *ExtensionManager) SendStartInvocationRequest(ctx context.Context, eventPayload json.RawMessage) context.Context {
 	body := bytes.NewBuffer(eventPayload)
 	req, _ := http.NewRequest(http.MethodPost, em.startInvocationUrl, body)
+
+	if lc, ok := lambdacontext.FromContext(ctx); ok {
+		req.Header.Set(lambdaRuntimeAwsRequestIdHeader, lc.AwsRequestID)
+	} else {
+		logger.Error(fmt.Errorf("missing AWS Lambda context. Unable to set lambda-runtime-aws-request-id header"))
+	}
+
 	response, err := em.httpClient.Do(req)
 	if response != nil && response.Body != nil {
 		defer func() {
@@ -153,6 +163,11 @@ func (em *ExtensionManager) SendEndInvocationRequest(ctx context.Context, functi
 	}
 	body := bytes.NewBuffer(content)
 	req, _ := http.NewRequest(http.MethodPost, em.endInvocationUrl, body)
+	if lc, ok := lambdacontext.FromContext(ctx); ok {
+		req.Header.Set(lambdaRuntimeAwsRequestIdHeader, lc.AwsRequestID)
+	} else {
+		logger.Error(fmt.Errorf("missing AWS Lambda context. Unable to set lambda-runtime-aws-request-id header"))
+	}
 
 	// Mark the invocation as an error if any
 	if cfg.Error != nil {

contrib/aws/datadog-lambda-go/internal/extension/extension_test.go

@@ -12,11 +12,13 @@ import (
 	"fmt"
 	"net/http"
 	"os"
+	"strings"
 	"testing"
 
 	"github.com/DataDog/dd-trace-go/contrib/aws/datadog-lambda-go/v2/internal/logger"
 	"github.com/DataDog/dd-trace-go/v2/ddtrace/ext"
 	"github.com/DataDog/dd-trace-go/v2/ddtrace/tracer"
+	"github.com/aws/aws-lambda-go/lambdacontext"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -149,6 +151,41 @@ func TestExtensionStartInvoke(t *testing.T) {
 	assert.Nil(t, samplingPriority)
 }
 
+func TestExtensionStartInvokeLambdaRequestId(t *testing.T) {
+	headers := http.Header{}
+	capturingClient := capturingClient{hdr: headers}
+
+	em := &ExtensionManager{
+		startInvocationUrl: startInvocationUrl,
+		httpClient:         capturingClient,
+	}
+
+	lc := &lambdacontext.LambdaContext{
+		AwsRequestID: "test-request-id-12345",
+	}
+	ctx := lambdacontext.NewContext(context.TODO(), lc)
+	em.SendStartInvocationRequest(ctx, []byte{})
+
+	err := em.Flush()
+
+	assert.Nil(t, err)
+	assert.Equal(t, "test-request-id-12345", headers.Get("lambda-runtime-aws-request-id"))
+}
+
+func TestExtensionStartInvokeLambdaRequestIdError(t *testing.T) {
+	em := &ExtensionManager{
+		startInvocationUrl: startInvocationUrl,
+		httpClient:         &ClientSuccessStartInvoke{},
+	}
+
+	logOutput := captureLog(func() { em.SendStartInvocationRequest(context.TODO(), []byte{}) })
+	err := em.Flush()
+	assert.Nil(t, err)
+	assert.Contains(t, logOutput, "missing AWS Lambda context. Unable to set lambda-runtime-aws-request-id header")
+	lines := strings.Split(strings.TrimSpace(logOutput), "\n")
+	assert.Equal(t, 1, len(lines))
+}
+
 func TestExtensionStartInvokeWithTraceContext(t *testing.T) {
 	headers := http.Header{}
 	headers.Set(string(DdTraceId), mockTraceId)
@@ -201,13 +238,58 @@ func TestExtensionEndInvocation(t *testing.T) {
 		endInvocationUrl: endInvocationUrl,
 		httpClient:       &ClientSuccessEndInvoke{},
 	}
+	ctx := lambdacontext.NewContext(context.TODO(), &lambdacontext.LambdaContext{})
 	span := tracer.StartSpan("aws.lambda")
-	logOutput := captureLog(func() { em.SendEndInvocationRequest(context.TODO(), span, tracer.FinishConfig{}) })
+	logOutput := captureLog(func() { em.SendEndInvocationRequest(ctx, span, tracer.FinishConfig{}) })
 	span.Finish()
 
 	assert.Equal(t, "", logOutput)
 }
 
+func TestExtensionEndInvokeLambdaRequestId(t *testing.T) {
+	headers := http.Header{}
+	capturingClient := capturingClient{hdr: headers}
+
+	em := &ExtensionManager{
+		endInvocationUrl: endInvocationUrl,
+		httpClient:       capturingClient,
+	}
+
+	lc := &lambdacontext.LambdaContext{
+		AwsRequestID: "test-request-id-12345",
+	}
+
+	ctx := lambdacontext.NewContext(context.TODO(), lc)
+	span := tracer.StartSpan("aws.lambda")
+	span.Finish()
+	cfg := tracer.FinishConfig{}
+	em.SendEndInvocationRequest(ctx, span, cfg)
+	err := em.Flush()
+	assert.Nil(t, err)
+	assert.Equal(t, "test-request-id-12345", headers.Get("lambda-runtime-aws-request-id"))
+}
+
+func TestExtensionEndInvokeLambdaRequestIdError(t *testing.T) {
+	headers := http.Header{}
+	capturingClient := capturingClient{hdr: headers}
+	ctx := context.WithValue(context.TODO(), DdSamplingPriority, mockSamplingPriority)
+	ctx = context.WithValue(ctx, DdTraceId, mockTraceId)
+	em := &ExtensionManager{
+		endInvocationUrl: endInvocationUrl,
+		httpClient:       capturingClient,
+	}
+
+	span := tracer.StartSpan("aws.lambda")
+	logOutput := captureLog(func() { em.SendEndInvocationRequest(ctx, span, tracer.FinishConfig{}) })
+	span.Finish()
+
+	err := em.Flush()
+	assert.Nil(t, err)
+	assert.Contains(t, logOutput, "missing AWS Lambda context. Unable to set lambda-runtime-aws-request-id header")
+	lines := strings.Split(strings.TrimSpace(logOutput), "\n")
+	assert.Equal(t, 1, len(lines))
+}
+
 func TestExtensionEndInvocationError(t *testing.T) {
 	em := &ExtensionManager{
 		endInvocationUrl: endInvocationUrl,