Add test that flushed query param is processed even with empty data

apm-lambda-extension/extension/http_server_test.go

@@ -258,3 +258,54 @@ func Test_handleIntakeV2EventsNoQueryParam(t *testing.T) {
 	<-dataChannel
 	assert.Equal(t, 202, resp.StatusCode)
 }
+
+func Test_handleIntakeV2EventsQueryParamEmptyData(t *testing.T) {
+	body := []byte(``)
+
+	AgentDoneSignal = make(chan struct{})
+
+	// Create apm server and handler
+	apmServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	}))
+	defer apmServer.Close()
+
+	// Create extension config and start the server
+	dataChannel := make(chan AgentData, 100)
+	config := extensionConfig{
+		apmServerUrl:               apmServer.URL,
+		dataReceiverServerPort:     ":1234",
+		dataReceiverTimeoutSeconds: 15,
+	}
+
+	StartHttpServer(dataChannel, &config)
+	defer agentDataServer.Close()
+
+	hosts, _ := net.LookupHost("localhost")
+	url := "http://" + hosts[0] + ":1234/intake/v2/events?flushed=true"
+
+	// Create a request to send to the extension
+	req, err := http.NewRequest("POST", url, bytes.NewReader(body))
+	if err != nil {
+		t.Logf("Could not create request")
+	}
+
+	// Send the request to the extension
+	client := &http.Client{}
+	go func() {
+		_, err := client.Do(req)
+		if err != nil {
+			t.Logf("Error fetching %s, [%v]", agentDataServer.Addr, err)
+			t.Fail()
+		}
+	}()
+
+	timer := time.NewTimer(1 * time.Second)
+	defer timer.Stop()
+
+	select {
+	case <-AgentDoneSignal:
+	case <-timer.C:
+		t.Log("Timed out waiting for server to send FuncDone signal")
+		t.Fail()
+	}
+}

apm-lambda-extension/extension/route_handlers.go

@@ -93,12 +93,14 @@ func handleIntakeV2Events(agentDataChan chan AgentData) func(w http.ResponseWrit
 			return
 		}
 
-		agentData := AgentData{
-			Data:            rawBytes,
-			ContentEncoding: r.Header.Get("Content-Encoding"),
+		if len(rawBytes) > 0 {
+			agentData := AgentData{
+				Data:            rawBytes,
+				ContentEncoding: r.Header.Get("Content-Encoding"),
+			}
+			log.Println("Adding agent data to buffer to be sent to apm server")
+			agentDataChan <- agentData
 		}
-		log.Println("Adding agent data to buffer to be sent to apm server")
-		agentDataChan <- agentData
 
 		if len(r.URL.Query()["flushed"]) > 0 && r.URL.Query()["flushed"][0] == "true" {
 			AgentDoneSignal <- struct{}{}