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protocol.js
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protocol.js
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// Copyright 2015 rain1017.
//
// 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. See the AUTHORS file
// for names of contributors.
'use strict';
var util = require('util');
var EventEmitter = require('events').EventEmitter;
var P = require('bluebird');
var logger = require('memdb-logger').getLogger('memdb-client', __filename);
var Protocol = function(opts){
EventEmitter.call(this);
opts = opts || {};
this.socket = opts.socket;
this.socket.setEncoding('utf8');
this.remainLine = '';
var self = this;
this.socket.on('data', function(data){
// message is json encoded and splited by '\n'
var lines = data.split('\n');
for(var i=0; i<lines.length - 1; i++){
try{
var msg = '';
if(i === 0){
msg = JSON.parse(self.remainLine + lines[i]);
self.remainLine = '';
}
else{
msg = JSON.parse(lines[i]);
}
self.emit('msg', msg);
}
catch(err){
logger.error(err.stack);
}
}
self.remainLine = lines[lines.length - 1];
});
this.socket.on('close', function(hadError){
self.emit('close', hadError);
});
this.socket.on('connect', function(){
self.emit('connect');
});
this.socket.on('error', function(err){
self.emit('error', err);
});
this.socket.on('timeout', function(){
self.emit('timeout');
});
};
util.inherits(Protocol, EventEmitter);
Protocol.prototype.send = function(msg){
var data = JSON.stringify(msg) + '\n';
var ret = this.socket.write(data);
if(!ret){
logger.warn('socket.write return false');
}
};
Protocol.prototype.disconnect = function(){
this.socket.end();
};
module.exports = Protocol;