implement gRPC support

pubsub: convert to grpc

lib/common/grpc-service-object.js

@@ -0,0 +1,102 @@
+/*!
+ * Copyright 2015 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*!
+ * @module common/grpcServiceObject
+ */
+
+'use strict';
+
+var extend = require('extend');
+var nodeutil = require('util');
+
+/**
+ * @type {module:common/serviceObject}
+ * @private
+ */
+var ServiceObject = require('./service-object.js');
+
+/**
+ * @type {module:common/util}
+ * @private
+ */
+var util = require('./util.js');
+
+/**
+ * GrpcServiceObject is a base class, meant to be inherited from by a service
+ * object that uses the gRPC protobuf API.
+ *
+ * @private
+ *
+ * @param {object} config - Configuration object.
+ */
+function GrpcServiceObject(config) {
+  ServiceObject.call(this, config);
+}
+
+nodeutil.inherits(GrpcServiceObject, ServiceObject);
+
+/**
+ * Delete the object.
+ *
+ * @param {function=} callback - The callback function.
+ * @param {?error} callback.err - An error returned while making this request.
+ */
+GrpcServiceObject.prototype.delete = function(callback) {
+  var protoOpts = this.methods.delete.protoOpts;
+  var reqOpts = this.methods.delete.reqOpts;
+
+  this.request(protoOpts, reqOpts, callback || util.noop);
+};
+
+/**
+ * Get the metadata of this object.
+ *
+ * @param {function} callback - The callback function.
+ * @param {?error} callback.err - An error returned while making this request.
+ * @param {object} callback.metadata - The metadata for this object.
+ */
+GrpcServiceObject.prototype.getMetadata = function(callback) {
+  var protoOpts = this.methods.getMetadata.protoOpts;
+  var reqOpts = this.methods.getMetadata.reqOpts;
+
+  this.request(protoOpts, reqOpts, callback);
+};
+
+/**
+ * Set the metadata for this object.
+ *
+ * @param {object} metadata - The metadata to set on this object.
+ * @param {function=} callback - The callback function.
+ * @param {?error} callback.err - An error returned while making this request.
+ */
+GrpcServiceObject.prototype.setMetadata = function(metadata, callback) {
+  var protoOpts = this.methods.setMetadata.protoOpts;
+  var reqOpts = extend(true, {}, this.methods.setMetadata.reqOpts, metadata);
+
+  this.request(protoOpts, reqOpts, callback || util.noop);
+};
+
+/**
+ * Patch a request to the GrpcService object.
+ *
+ * @private
+ */
+GrpcServiceObject.prototype.request = function(protoOpts, reqOpts, callback) {
+  this.parent.request(protoOpts, reqOpts, callback);
+};
+
+module.exports = GrpcServiceObject;