Fix missing OtelSpanEvent helper when using Event API from inside @WithSpan annotated method (#8019)

Author: mcculls

dd-java-agent/instrumentation/opentelemetry/opentelemetry-1.4/src/main/java/datadog/trace/instrumentation/opentelemetry14/OpenTelemetryInstrumentation.java

@@ -73,12 +73,12 @@ public String[] helperClassNames() {
       "datadog.opentelemetry.shim.trace.OtelSpanBuilder",
       "datadog.opentelemetry.shim.trace.OtelSpanBuilder$1",
       "datadog.opentelemetry.shim.trace.OtelSpanContext",
+      "datadog.opentelemetry.shim.trace.OtelSpanEvent",
       "datadog.opentelemetry.shim.trace.OtelSpanEvent$AttributesJsonParser",
       "datadog.opentelemetry.shim.trace.OtelSpanLink",
       "datadog.opentelemetry.shim.trace.OtelTracer",
       "datadog.opentelemetry.shim.trace.OtelTracerBuilder",
       "datadog.opentelemetry.shim.trace.OtelTracerProvider",
-      "datadog.opentelemetry.shim.trace.OtelSpanEvent",
     };
   }
 

dd-java-agent/instrumentation/opentelemetry/opentelemetry-1.4/src/main/java/datadog/trace/instrumentation/opentelemetry14/context/OpenTelemetryContextInstrumentation.java

@@ -67,6 +67,8 @@ public String[] helperClassNames() {
       "datadog.opentelemetry.shim.trace.OtelSpanBuilder",
       "datadog.opentelemetry.shim.trace.OtelSpanBuilder$1",
       "datadog.opentelemetry.shim.trace.OtelSpanContext",
+      "datadog.opentelemetry.shim.trace.OtelSpanEvent",
+      "datadog.opentelemetry.shim.trace.OtelSpanEvent$AttributesJsonParser",
       "datadog.opentelemetry.shim.trace.OtelSpanLink",
       "datadog.opentelemetry.shim.trace.OtelTracer",
       "datadog.opentelemetry.shim.trace.OtelTracerBuilder",

dd-java-agent/instrumentation/opentelemetry/opentelemetry-1.4/src/main/java/datadog/trace/instrumentation/opentelemetry14/context/OpenTelemetryContextStorageInstrumentation.java

@@ -68,6 +68,8 @@ public String[] helperClassNames() {
       "datadog.opentelemetry.shim.trace.OtelSpanBuilder",
       "datadog.opentelemetry.shim.trace.OtelSpanBuilder$1",
       "datadog.opentelemetry.shim.trace.OtelSpanContext",
+      "datadog.opentelemetry.shim.trace.OtelSpanEvent",
+      "datadog.opentelemetry.shim.trace.OtelSpanEvent$AttributesJsonParser",
       "datadog.opentelemetry.shim.trace.OtelSpanLink",
       "datadog.opentelemetry.shim.trace.OtelTracer",
       "datadog.opentelemetry.shim.trace.OtelTracerBuilder",

dd-smoke-tests/opentelemetry/build.gradle

@@ -11,6 +11,7 @@ application {
 
 dependencies {
   implementation group: 'io.opentelemetry', name: 'opentelemetry-api', version: '1.4.0'
+  implementation group: 'io.opentelemetry.instrumentation', name: 'opentelemetry-instrumentation-annotations', version: '1.20.0'
   testImplementation project(':dd-smoke-tests')
 }
 

dd-smoke-tests/opentelemetry/src/main/java/datadog/smoketest/opentelemetry/Application.java

@@ -3,15 +3,26 @@
 import io.opentelemetry.api.GlobalOpenTelemetry;
 import io.opentelemetry.api.trace.Span;
 import io.opentelemetry.api.trace.Tracer;
+import io.opentelemetry.instrumentation.annotations.WithSpan;
 
 /**
  * This application is a minimalistic application to create a trace with Open Telemetry Tracer API.
  */
 public class Application {
+
+  @WithSpan
+  static void annotatedSpan() {
+    Span.current().addEvent("annotated-span-event");
+  }
+
   public static void main(String[] args) throws InterruptedException {
+    // Start trace without touching GlobalOpenTelemetry
+    annotatedSpan();
+
     // Get an Open Telemetry tracer
     Tracer tracer = GlobalOpenTelemetry.getTracerProvider().tracerBuilder("smoketests").build();
-    // Create a trace with few spans
+
+    // Start some manual traces
     for (int i = 0; i < 10; i++) {
       Span span = tracer.spanBuilder("span-" + i).startSpan();
       Thread.sleep(20);

dd-smoke-tests/opentelemetry/src/test/groovy/datadog/smoketest/OpenTelemetrySmokeTest.groovy

@@ -1,13 +1,17 @@
 package datadog.smoketest
 
+import static java.util.concurrent.TimeUnit.SECONDS
+
 class OpenTelemetrySmokeTest extends AbstractSmokeTest {
+  public static final int TIMEOUT_SECS = 30
+
   @Override
   ProcessBuilder createProcessBuilder() {
     def jarPath = System.getProperty("datadog.smoketest.shadowJar.path")
     def command = new ArrayList<String>()
     command.add(javaPath())
     command.addAll(defaultJavaProperties)
-    command.add("-Ddd.integration.opentelemetry.experimental.enabled=true")
+    command.add("-Ddd.trace.otel.enabled=true")
     command.addAll(["-jar", jarPath])
 
     ProcessBuilder processBuilder = new ProcessBuilder(command)
@@ -16,6 +20,8 @@ class OpenTelemetrySmokeTest extends AbstractSmokeTest {
 
   def 'receive trace'() {
     expect:
-    waitForTraceCount(1)
+    waitForTraceCount(11) // 1 annotated, 10 manual
+    assert testedProcess.waitFor(TIMEOUT_SECS, SECONDS)
+    assert testedProcess.exitValue() == 0
   }
 }