/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/**
* This module contains functions that are common to client and server
* code. None of them should be used directly by gRPC users.
* @module
*/
'use strict';
var _ = require('lodash');
/**
* Get a function that deserializes a specific type of protobuf.
* @param {function()} cls The constructor of the message type to deserialize
* @return {function(Buffer):cls} The deserialization function
*/
exports.deserializeCls = function deserializeCls(cls) {
/**
* 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) {
// Convert to a native object with binary fields as Buffers (first argument)
// and longs as strings (second argument)
return cls.decode(arg_buf).toRaw(false, true);
};
};
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) {
return new Buffer(new Cls(arg).encode().toBuffer());
};
};
var serializeCls = exports.serializeCls;
/**
* Get the fully qualified (dotted) name of a ProtoBuf.Reflect value.
* @param {ProtoBuf.Reflect.Namespace} 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_name = fullyQualifiedName(value.parent);
if (parent_name !== '') {
name = parent_name + '.' + name;
}
return name;
};
var fullyQualifiedName = exports.fullyQualifiedName;
/**
* Wrap a function to pass null-like values through without calling it. If no
* function is given, just uses the identity;
* @param {?function} func The function to wrap
* @return {function} The wrapped function
*/
exports.wrapIgnoreNull = function wrapIgnoreNull(func) {
Iif (!func) {
return _.identity;
}
return function(arg) {
if (arg === null || arg === undefined) {
return null;
}
return func(arg);
};
};
/**
* Return a map from method names to method attributes for the service.
* @param {ProtoBuf.Reflect.Service} service The service to get attributes for
* @return {Object} The attributes map
*/
exports.getProtobufServiceAttrs = function getProtobufServiceAttrs(service) {
var prefix = '/' + fullyQualifiedName(service) + '/';
return _.object(_.map(service.children, function(method) {
return [_.camelCase(method.name), {
path: prefix + _.capitalize(method.name),
requestStream: method.requestStream,
responseStream: method.responseStream,
requestSerialize: serializeCls(method.resolvedRequestType.build()),
requestDeserialize: deserializeCls(method.resolvedRequestType.build()),
responseSerialize: serializeCls(method.resolvedResponseType.build()),
responseDeserialize: deserializeCls(method.resolvedResponseType.build())
}];
}));
};
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