BinderTransport customizable server location (#27083)

When bind to service, allow user to spacify service's package name and
class name

src/core/ext/transport/binder/client/channel_create.cc

@@ -44,13 +44,11 @@ namespace grpc {
 namespace experimental {
 
 // This should be called before calling CreateBinderChannel
-// TODO(mingcl): Pass package_name and class_name down to connection helper
 // TODO(mingcl): Invoke a callback and pass binder object to caller after a
 // successful bind
 void BindToOnDeviceServerService(void* jni_env_void, jobject application,
-                                 absl::string_view /*package_name*/,
-                                 absl::string_view /*class_name*/
-) {
+                                 absl::string_view package_name,
+                                 absl::string_view class_name) {
   // Init gRPC library first so gpr_log works
   grpc::internal::GrpcLibrary init_lib;
   init_lib.init();
@@ -58,11 +56,11 @@ void BindToOnDeviceServerService(void* jni_env_void, jobject application,
   JNIEnv* jni_env = static_cast<JNIEnv*>(jni_env_void);
 
   // clang-format off
-  CallStaticJavaMethod(jni_env,
+  grpc_binder::CallStaticJavaMethod(jni_env,
                        "io/grpc/binder/cpp/NativeConnectionHelper",
                        "tryEstablishConnection",
-                       "(Landroid/content/Context;)V",
-                       application);
+                       "(Landroid/content/Context;Ljava/lang/String;Ljava/lang/String;)V",
+                       application, std::string(package_name), std::string(class_name));
   // clang-format on
 }
 
@@ -76,7 +74,7 @@ std::shared_ptr<grpc::Channel> CreateBinderChannel(
   JNIEnv* jni_env = static_cast<JNIEnv*>(jni_env_void);
 
   // clang-format off
-  jobject object = CallStaticJavaMethodForObject(
+  jobject object = grpc_binder::CallStaticJavaMethodForObject(
       jni_env,
       "io/grpc/binder/cpp/NativeConnectionHelper",
       "getServiceBinder",

src/core/ext/transport/binder/client/jni_utils.cc

@@ -20,9 +20,12 @@
 
 #if defined(ANDROID) || defined(__ANDROID__)
 
+namespace grpc_binder {
+
 void CallStaticJavaMethod(JNIEnv* env, const std::string& clazz,
                           const std::string& method, const std::string& type,
-                          jobject application) {
+                          jobject application, const std::string& pkg,
+                          const std::string& cls) {
   jclass cl = env->FindClass(clazz.c_str());
   if (cl == nullptr) {
     gpr_log(GPR_ERROR, "No class %s", clazz.c_str());
@@ -33,7 +36,9 @@ void CallStaticJavaMethod(JNIEnv* env, const std::string& clazz,
     gpr_log(GPR_ERROR, "No method id %s", method.c_str());
   }
 
-  env->CallStaticVoidMethod(cl, mid, application);
+  env->CallStaticVoidMethod(cl, mid, application,
+                            env->NewStringUTF(pkg.c_str()),
+                            env->NewStringUTF(cls.c_str()));
 }
 
 jobject CallStaticJavaMethodForObject(JNIEnv* env, const std::string& clazz,
@@ -60,4 +65,6 @@ jobject CallStaticJavaMethodForObject(JNIEnv* env, const std::string& clazz,
   return object;
 }
 
+}  // namespace grpc_binder
+
 #endif

src/core/ext/transport/binder/client/jni_utils.h

@@ -23,15 +23,20 @@
 
 #include <string>
 
-// TODO(mingcl): Put these functions in a proper namespace
+namespace grpc_binder {
+
 // TODO(mingcl): Use string_view
+// For now we hard code the arguments of the Java function because this is only
+// used to call that single function.
 void CallStaticJavaMethod(JNIEnv* env, const std::string& clazz,
                           const std::string& method, const std::string& type,
-                          jobject application);
+                          jobject application, const std::string& pkg,
+                          const std::string& cls);
 
 jobject CallStaticJavaMethodForObject(JNIEnv* env, const std::string& clazz,
                                       const std::string& method,
                                       const std::string& type);
+}  // namespace grpc_binder
 
 #endif
 

src/core/ext/transport/binder/java/io/grpc/binder/cpp/NativeConnectionHelper.java

@@ -25,9 +25,9 @@ import android.os.Parcel;
 final class NativeConnectionHelper {
   static SyncServiceConnection s;
 
-  static void tryEstablishConnection(Context context) {
+  static void tryEstablishConnection(Context context, String pkg, String cls) {
     s = new SyncServiceConnection(context);
-    s.tryConnect();
+    s.tryConnect(pkg, cls);
   }
 
   // TODO(mingcl): We should notify C++ once we got the service binder so they don't need to call

src/core/ext/transport/binder/java/io/grpc/binder/cpp/SyncServiceConnection.java

@@ -45,13 +45,10 @@ public class SyncServiceConnection implements ServiceConnection {
     Log.e(logTag, "Service has disconnected: ");
   }
 
-  public void tryConnect() {
+  public void tryConnect(String pkg, String cls) {
     synchronized (this) {
       Intent intent = new Intent("grpc.io.action.BIND");
-      // TODO(mingcl): The component name is currently hard-coded here and should be changed
-      // manually before compile. We should pump the component name from C++ to here instead after
-      // we have a server ready for integration test.
-      ComponentName compName = new ComponentName("redacted", "redacted");
+      ComponentName compName = new ComponentName(pkg, cls);
       intent.setComponent(compName);
       // Will return true if the system is in the process of bringing up a service that your client
       // has permission to bind to; false if the system couldn't find the service or if your client