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/**
* @license
* Copyright 2017 gRPC authors.
*
* 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
* @private
*/
'use strict';
var _ = require('lodash');
var client = require('./client');
/**
* Get a function that deserializes a specific type of protobuf.
* @param {function()} cls The constructor of the message type to deserialize
* @param {bool=} binaryAsBase64 Deserialize bytes fields as base64 strings
* instead of Buffers. Defaults to false
* @param {bool=} longsAsStrings Deserialize long values as strings instead of
* objects. Defaults to true
* @return {function(Buffer):cls} The deserialization function
*/
exports.deserializeCls = function deserializeCls(cls, options) {
var conversion_options = {
defaults: true,
bytes: options.binaryAsBase64 ? String : Buffer,
longs: options.longsAsStrings ? String : null,
enums: options.enumsAsStrings ? String : null,
oneofs: true
};
/**
* Deserialize a buffer to a message object
* @param {Buffer} arg_buf The buffer to deserialize
* @return {cls} The resulting object
*/
return function deserialize(arg_buf) {
return cls.decode(arg_buf).toObject(conversion_options);
};
};
var deserializeCls = exports.deserializeCls;
/**
* Get a function that serializes objects to a buffer by protobuf class.
* @param {function()} Cls The constructor of the message type to serialize
* @return {function(Cls):Buffer} The serialization function
*/
exports.serializeCls = function serializeCls(cls) {
/**
* Serialize an object to a Buffer
* @param {Object} arg The object to serialize
* @return {Buffer} The serialized object
*/
return function serialize(arg) {
var message = cls.fromObject(arg);
return cls.encode(message).finish();
};
};
var serializeCls = exports.serializeCls;
/**
* Get the fully qualified (dotted) name of a ProtoBuf.Reflect value.
* @param {ProtoBuf.ReflectionObject} value The value to get the name of
* @return {string} The fully qualified name of the value
*/
exports.fullyQualifiedName = function fullyQualifiedName(value) {
if (value === null || value === undefined) {
return '';
}
var name = value.name;
var parent_fqn = fullyQualifiedName(value.parent);
if (parent_fqn !== '') {
name = parent_fqn + '.' + name;
}
return name;
};
var fullyQualifiedName = exports.fullyQualifiedName;
/**
* Return a map from method names to method attributes for the service.
* @param {ProtoBuf.Service} service The service to get attributes for
* @param {Object=} options Options to apply to these attributes
* @return {Object} The attributes map
*/
exports.getProtobufServiceAttrs = function getProtobufServiceAttrs(service,
options) {
var prefix = '/' + fullyQualifiedName(service) + '/';
service.resolveAll();
return _.zipObject(_.map(service.methods, function(method) {
return _.camelCase(method.name);
}), _.map(service.methods, function(method) {
return {
originalName: method.name,
path: prefix + method.name,
requestStream: !!method.requestStream,
responseStream: !!method.responseStream,
requestType: method.resolvedRequestType,
responseType: method.resolvedResponseType,
requestSerialize: serializeCls(method.resolvedRequestType),
requestDeserialize: deserializeCls(method.resolvedRequestType, options),
responseSerialize: serializeCls(method.resolvedResponseType),
responseDeserialize: deserializeCls(method.resolvedResponseType, options)
};
}));
};
var getProtobufServiceAttrs = exports.getProtobufServiceAttrs;
exports.loadObject = function loadObject(value, options) {
var result = {};
if (!value) {
return value;
}
if (value.hasOwnProperty('methods')) {
// It's a service object
var service_attrs = getProtobufServiceAttrs(value, options);
return client.makeClientConstructor(service_attrs);
}
if (value.hasOwnProperty('nested')) {
// It's a namespace or root object
_.each(value.nested, function(nested, name) {
result[name] = loadObject(nested, options);
});
return result;
}
// Otherwise, it's not something we need to change
return value;
};
/**
* The primary purpose of this method is to distinguish between reflection
* objects from different versions of ProtoBuf.js. This is just a heuristic,
* checking for properties that are (currently) specific to this version of
* ProtoBuf.js
* @param {Object} obj The object to check
* @return {boolean} Whether the object appears to be a Protobuf.js 6
* ReflectionObject
*/
exports.isProbablyProtobufJs6 = function isProbablyProtobufJs6(obj) {
return (typeof obj.root === 'object') && (typeof obj.resolve === 'function');
};
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