Use more OTel code for runtime attachment (#2414)

Author: jeanbisutti

agent/runtime-attach/build.gradle.kts

@@ -10,8 +10,7 @@ val otelVersion: String by project
 val agent: Configuration by configurations.creating
 
 dependencies {
-  implementation("net.bytebuddy:byte-buddy-agent") // To replace with  implementation("io.opentelemetry.contrib:opentelemetry-runtime-attach:$otelContribAlphaVersion")
-  // after next OTel java contrib release
+  implementation("io.opentelemetry.contrib:opentelemetry-runtime-attach-core:$otelContribAlphaVersion")
   agent(project(":agent:agent", configuration = "shadow"))
 }
 

agent/runtime-attach/src/main/java/com/microsoft/applicationinsights/attach/AppInsightAgentFileProvider.java

@@ -21,13 +21,14 @@
 
 package com.microsoft.applicationinsights.attach;
 
+import io.opentelemetry.contrib.attach.CoreRuntimeAttach;
 import java.io.BufferedReader;
-import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.nio.charset.StandardCharsets;
 import java.util.Optional;
+import java.util.Properties;
 import java.util.logging.Logger;
 import java.util.stream.Collectors;
 
@@ -62,18 +63,10 @@ public static void attach() {
       System.setProperty(RUNTIME_ATTACHED_JSON_PROPERTY, jsonConfig.get());
     }
 
-    File agentFile = AppInsightAgentFileProvider.getAgentFile();
+    String appInsightResourceName = findAppInsightResourceName();
+    CoreRuntimeAttach runtimeAttach = new CoreRuntimeAttach(appInsightResourceName);
 
-    try {
-      RuntimeAttach.attachJavaagentToCurrentJvm(agentFile);
-    } catch (IllegalStateException e) {
-      if (e.getMessage() != null
-          && e.getMessage()
-              .contains("No compatible attachment provider is available")) { // Byte Buddy exception
-        throw new IllegalStateException("Runtime attachment was not done. You may use a JRE.", e);
-      }
-      throw e;
-    }
+    runtimeAttach.attachJavaagentToCurrentJVM();
   }
 
   private static Optional<String> findJsonConfig() {
@@ -102,4 +95,20 @@ private static boolean agentIsAttached() {
       return false;
     }
   }
+
+  private static String findAppInsightResourceName() {
+    String appInsightVersion = findAppInsightVersion();
+    return "/applicationinsights-agent-" + appInsightVersion + ".jar";
+  }
+
+  private static String findAppInsightVersion() {
+    try (InputStream jarAsInputStream =
+        ApplicationInsights.class.getResourceAsStream("/ai.sdk-version.properties")) {
+      Properties props = new Properties();
+      props.load(jarAsInputStream);
+      return props.getProperty("version");
+    } catch (IOException e) {
+      throw new IllegalStateException("Unable to find Application Insights version", e);
+    }
+  }
 }