Node Async lock (异步锁)

a simple node async lock that support ttl base memory database such as redis.

install

``js
npm install node-async-lock
`

usage

node_redis demo :

`js
var redis = require("redis"),
client = redis.createClient(6379,'localhost');

var ASYNCLOCK = require('node-async-lock');
var AsyncLock = new ASYNCLOCK({
set:function(key,data,ttl,callback){
client.set(key,data,function(err,reply){
callback(err,reply.toString());
});
client.expire(key,ttl);
},
get:function(key,callback){
client.get(key,function(err,reply){
callback(err,reply.toString());
});
},
remove:function(key,callback){
client.del(key,function(err){
callback(err);
})
},
ttl:60, //the unit is second,defualt one day.
namespace:'test-asynclock-ttl-' //default:async-lock-ttl-
});

eg1:

function testLock(cb){
AsyncLock.lock('buy',2,function(err,data){
cb(err,data);
})
}

eg2:

function testLock(cb){
AsyncLock.lock('pay',2,function(err,data){
if(!err){
//todo your code.
AsyncLock.unlock('pay',function(err,data){
cb(err,data);
})
}else{
cb(err,data);
}
})
}
`

API

- lock

- unlock

- remove

- getNameSpace

lock

`js
AsyncLock.lock('test-redis',10,function(err,data){
console.log(err,data);
})
`

unlock

`js
AsyncLock.unlock('test-redis',function(err,data){
console.log(err,data);
})
`

remove

`js
AsyncLock.remove('test-redis',function(err,data){
console.log(err);
})
`

getNameSpace

`js
console.log(AsyncLock.getNameSpace());//test-asynclock-ttl
``