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| var net = require('net');
var EventEmitter = require('events').EventEmitter;
var CRLF = '\r\n'; //换行符
var CRLF_LENGTH = CRLF.length;
var ERRORS = ['ERROR', 'NOT_FOUND', 'CLIENT_ERROR', 'SERVER_ERROR']; //错误
var ERRORS_LENGTH = ERRORS.length;
//读取一行数据
function readLine(string){
'use strict';
var pos = string.indexOf(CRLF);
if (pos > -1) {
return string.substr(0, pos);
}
return string;
}
/**
* memcache类
* @return {[type]} [description]
*/
module.exports = Class(function(){
'use strict';
return {
init: function(port, hostname){
EventEmitter.call(this);
this.port = port || 11211;
this.hostname = hostname || 'localhost';
this.buffer = '';
this.callbacks = []; //回调函数
this.handle = null; //socket连接句柄
},
/**
* 建立连接
* @return {[type]} [description]
*/
connect: function(){
if (this.handle) {
return this;
}
var self = this;
var deferred = getDefer();
this.handle = net.createConnection(this.port, this.host);
this.handle.on('connect', function(){
this.setTimeout(0);
this.setNoDelay();
self.emit('connect');
deferred.resolve();
});
this.handle.on('data', function(data){
self.buffer += data.toString();
self.handleData();
});
this.handle.on('end', function(){
while(self.callbacks.length > 0){
var callback = self.callbacks.shift();
if (callback && callback.callback) {
callback.callback('CONNECTION_CLOSED');
}
}
self.handle = null;
});
this.handle.on('close', function(){
self.handle = null;
self.emit('close');
});
this.handle.on('timeout', function(){
if (self.callbacks.length > 0) {
var callback = self.callbacks.shift();
if (callback && callback.callback) {
callback.callback('TIMEOUT');
}
}
self.emit('timeout');
});
this.handle.on('error', function(error){
while(self.callbacks.length > 0){
var callback = self.callbacks.shift();
if (callback && callback.callback) {
callback.callback('ERROR');
}
}
self.handle = null;
self.emit('clienterror', error);
});
this.promise = deferred.promise;
return this;
},
/**
* 处理接收的数据
* @return {[type]} [description]
*/
handleData: function(){
while(this.buffer.length > 0){
var result = this.getHandleResult(this.buffer);
if(result === false){
break;
}
var value = result[0];
var pos = result[1];
var error = result[2];
if (pos > this.buffer.length) {
break;
}
this.buffer = this.buffer.substring(pos);
var callback = this.callbacks.shift();
if (callback && callback.callback) {
callback.callback(error, value);
}
}
},
getHandleResult: function(buffer){
if (buffer.indexOf(CRLF) === -1) {
return false;
}
for(var i = 0; i < ERRORS_LENGTH; i++){
var item = ERRORS[i];
if (buffer.indexOf(item) > -1) {
return this.handleError(buffer);
}
}
var callback = this.callbacks[0];
if (callback && callback.type) {
return this['handle' + ucfirst(callback.type)](buffer);
}
return false;
},
/**
* 处理错误
* @param {[type]} buffer [description]
* @return {[type]} [description]
*/
handleError: function(buffer){
var line = readLine(buffer);
return [null, line.length + CRLF_LENGTH, line];
},
/**
* 处理获取数据
* @param {[type]} buffer [description]
* @return {[type]} [description]
*/
handleGet: function(buffer){
var value = null;
var end = 3;
var resultLen = 0;
var firstPos;
if (buffer.indexOf('END') === 0) {
return [value, end + CRLF_LENGTH];
}else if (buffer.indexOf('VALUE') === 0 && buffer.indexOf('END') > -1) {
firstPos = buffer.indexOf(CRLF) + CRLF_LENGTH;
var endPos = buffer.indexOf('END');
resultLen = endPos - firstPos - CRLF_LENGTH;
value = buffer.substr(firstPos, resultLen);
return [value, firstPos + parseInt(resultLen, 10) + CRLF_LENGTH + end + CRLF_LENGTH];
}else{
firstPos = buffer.indexOf(CRLF) + CRLF_LENGTH;
resultLen = buffer.substr(0, firstPos).split(' ')[3];
value = buffer.substr(firstPos, resultLen);
return [value, firstPos + parseInt(resultLen) + CRLF_LENGTH + end + CRLF_LENGTH];
}
},
/**
* 处理简单数据
* @param {[type]} buffer [description]
* @return {[type]} [description]
*/
handleSimple: function(buffer){
var line = readLine(buffer);
return [line, line.length + CRLF_LENGTH, null];
},
/**
* 版本号
* @param {[type]} buffer [description]
* @return {[type]} [description]
*/
handleVersion: function(buffer){
var pos = buffer.indexOf(CRLF);
//8 is length of 'VERSION '
var value = buffer.substr(8, pos - 8);
return [value, pos + CRLF_LENGTH, null];
},
/**
* 查询
* @param {[type]} query [description]
* @param {[type]} type [description]
* @param {Function} callback [description]
* @return {[type]} [description]
*/
query: function(query, type){
this.connect();
var self = this;
var deferred = getDefer();
var callback = function(error, value){
return error ? deferred.reject(error) : deferred.resolve(value);
}
this.promise.then(function(){
self.callbacks.push({type: type, callback: callback});
self.handle.write(query + CRLF);
});
return deferred.promise;
},
/**
* 获取
* @param {[type]} key [description]
* @param {Function} callback [description]
* @return {[type]} [description]
*/
get: function(key){
return this.query('get ' + key, 'get');
},
/**
* 存储
* @return {[type]} [description]
*/
store: function(key, value, type, lifetime, flags){
lifetime = lifetime || 0;
flags = flags || 0;
var length = Buffer.byteLength(value.toString());
var query = [type, key, flags, lifetime, length].join(' ') + CRLF + value;
return this.query(query, 'simple');
},
/**
* 删除
* @param {[type]} key [description]
* @param {Function} callback [description]
* @return {[type]} [description]
*/
delete: function(key){
return this.query('delete ' + key, 'simple');
},
/**
* 获取版本号
* @param {Function} callback [description]
* @return {[type]} [description]
*/
version: function(){
return this.query('version', 'version');
},
/**
* 增长
* @param {[type]} key [description]
* @param {[type]} step [description]
* @param {Function} callback [description]
* @return {[type]} [description]
*/
increment: function(key, step){
step = step || 1;
return this.query('incr ' + key + ' ' + step, 'simple');
},
/**
* 减少
* @param {[type]} key [description]
* @param {[type]} step [description]
* @param {Function} callback [description]
* @return {[type]} [description]
*/
decrement: function(key, step){
step = step || 1;
return this.query('decr ' + key + ' ' + step, 'simple');
},
/**
* 关闭
* @return {[type]} [description]
*/
close: function(){
if (this.handle && this.handle.readyState === 'open') {
this.handle.end();
this.handle = null;
}
}
}
}, EventEmitter).extend(function(){
'use strict';
var result = {};
['set', 'add', 'replace', 'append', 'prepend'].forEach(function(item){
result[item] = function(key, value, lifetime, flags){
return this.store(key, value, 'set', lifetime, flags);
}
});
return result;
}); |