protocol.js.org 2.3 KB
/ Copyright 2015 The MemDB 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. 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;