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dbsync.js
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dbsync.js
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/**
* Module dependencies.
*/
var commands = require('./commands');
var utils = require('./utils/utils');
var Queue = require('./utils/queue');
var fs = require('fs');
var crypto = require('crypto');
var Rewriter = require('../lib/rewriter/rewriter');
var SyncTimer = require('../lib/timer/synctimer');
/**
*
* DataSync Components.
*
* Initialize a new `DataSync` with the given `options`.
*
* DataSync's prototype is based on `commands` under the same directory;
*
* @class DataSync
* @constructor
* @param {Object} options init params include aof,log,interval,mapping and mappingPath etc.
*
*/
var DataSync = module.exports = function(options) {
options = options || {};
this.dbs = [];
this.selectDB(0);
this.client = options.client;
this.aof = options.aof || false;
this.debug = options.debug || false;
this.log = options.log || console;
this.interval = options.interval || 1000 * 60;
this.flushQueue = new Queue();
this.mergerMap = {};
if (!!this.aof) {
if (!!options.filename) {
this.filename = options.filename;
} else {
var path = process.cwd() + '/logs';
fs.mkdirSync(path);
this.filename = path+'/dbsync.log';
}
this.stream = fs.createWriteStream(this.filename, { flags: 'a' });
}
if (!!options.mapping){
this.mapping = options.mapping;
} else if (!!options.mappingPath) {
this.mapping = this.loadMapping(options.mappingPath);
}
this.rewriter = options.rewriter || new Rewriter(this);
this.timer = options.timer || new SyncTimer();
this.timer.start(this);
};
/**
* Expose commands to store.
*/
DataSync.prototype = commands;
/**
* Select database at the given `index`.
* @api private
* @param {Number} index
*/
DataSync.prototype.selectDB = function(index){
var db = this.dbs[index];
if (!db) {
db = {};
db.data = {};
this.dbs[index] = db;
}
this.db = db;
};
/**
*return the first used db
*
* @api private
*/
DataSync.prototype.use = function() {
this.selectDB(0);
var db = this.dbs[0];
var keys = Object.keys(db);
var dbkey = keys[0];
return db[dbkey];
};
/**
* Lookup `key`, when volatile compare timestamps to
* expire the key.
*
* @api private
* @param {String} key
* @return {Object}
*/
DataSync.prototype.lookup = function(key){
var obj = this.db.data[key];
if (obj && 'number' == typeof obj.expires && Date.now() > obj.expires) {
delete this.db.data[key];
return;
}
return obj;
};
/**
* Write the given `cmd`, and `args` to the AOF.
*
* @api private
* @param {String} cmd
* @param {Array} args
*/
DataSync.prototype.writeToAOF = function(cmd, args){
var self = this;
if (!self.aof) {return;}
var argc = args.length;
var op = '*' + (argc + 1) + '\r\n' + cmd + '\r\n';
// Write head length
this.stream.write(op);
var i = 0;
// Write Args
for (i = 0; i < argc; ++i) {
var key = utils.string(args[i]);
this.stream.write(key);
this.stream.write('\r\n');
}
};