Add options to omit CQ or sync server APIs in generated code

PiperOrigin-RevId: 625490214

src/compiler/cpp_generator.h

@@ -64,6 +64,10 @@ struct Parameters {
   std::string message_header_extension;
   // Whether to include headers corresponding to imports in source file.
   bool include_import_headers;
+  // Whether to expose synchronous server API.
+  bool allow_sync_server_api;
+  // Whether to generate completion queue API.
+  bool allow_cq_api;
 };
 
 // Return the prologue of the generated header file.

src/compiler/cpp_plugin.h

@@ -65,6 +65,8 @@ class CppGrpcGenerator : public grpc::protobuf::compiler::CodeGenerator {
     generator_parameters.use_system_headers = true;
     generator_parameters.generate_mock_code = false;
     generator_parameters.include_import_headers = false;
+    generator_parameters.allow_sync_server_api = true;
+    generator_parameters.allow_cq_api = true;
 
     ProtoBufFile pbfile(file);
 
@@ -95,6 +97,24 @@ class CppGrpcGenerator : public grpc::protobuf::compiler::CodeGenerator {
             *error = std::string("Invalid parameter: ") + *parameter_string;
             return false;
           }
+        } else if (param[0] == "allow_sync_server_api") {
+          if (param[1] == "true") {
+            generator_parameters.allow_sync_server_api = true;
+          } else if (param[1] == "false") {
+            generator_parameters.allow_sync_server_api = false;
+          } else {
+            *error = std::string("Invalid parameter: ") + *parameter_string;
+            return false;
+          }
+        } else if (param[0] == "allow_cq_api") {
+          if (param[1] == "true") {
+            generator_parameters.allow_cq_api = true;
+          } else if (param[1] == "false") {
+            generator_parameters.allow_cq_api = false;
+          } else {
+            *error = std::string("Invalid parameter: ") + *parameter_string;
+            return false;
+          }
         } else if (param[0] == "gmock_search_path") {
           generator_parameters.gmock_search_path = param[1];
         } else if (param[0] == "additional_header_includes") {