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1
| /**
Redis Backend.
Implementation of the storage backend using Redis
*/
"use strict";
var contract = require('./contract');
function noop(){};
function RedisBackend(redis, prefix){
this.redis = redis;
this.prefix = prefix || 'acl';
}
RedisBackend.prototype = {
/**
Begins a transaction
*/
begin : function(){
return this.redis.multi();
},
/**
Ends a transaction (and executes it)
*/
end : function(transaction, cb){
contract(arguments).params('object', 'function').end();
transaction.exec(function(){cb()});
},
/**
Cleans the whole storage.
*/
clean : function(cb){
contract(arguments).params('function').end();
var self = this;
self.redis.keys(self.prefix+'*', function(err, keys){
if(keys.length){
self.redis.del(keys, function(){cb()});
}else{
cb();
}
});
},
/**
Gets the contents at the bucket's key.
*/
get : function(bucket, key, cb){
contract(arguments)
.params('string', 'string', 'function')
.end();
key = this.bucketKey(bucket, key);
this.redis.smembers(key, cb);
},
/**
Returns the union of the values in the given keys.
*/
union : function(bucket, keys, cb){
contract(arguments)
.params('string', 'array', 'function')
.end();
keys = this.bucketKey(bucket, keys);
this.redis.sunion(keys, cb);
},
/**
Adds values to a given key inside a bucket.
*/
add : function(transaction, bucket, key, values){
contract(arguments)
.params('object', 'string', 'string','string|array')
.end();
key = this.bucketKey(bucket, key);
if (Array.isArray(values)){
values.forEach(function(value){
transaction.sadd(key, value);
});
}else{
transaction.sadd(key, values);
}
},
/**
Delete the given key(s) at the bucket
*/
del : function(transaction, bucket, keys){
contract(arguments)
.params('object', 'string', 'string|array')
.end();
var self = this;
keys = Array.isArray(keys) ? keys : [keys]
keys = keys.map(function(key){
return self.bucketKey(bucket, key);
});
transaction.del(keys);
},
/**
Removes values from a given key inside a bucket.
*/
remove : function(transaction, bucket, key, values){
contract(arguments)
.params('object', 'string', 'string','string|array')
.end();
key = this.bucketKey(bucket, key);
if (Array.isArray(values)){
values.forEach(function(value){
transaction.srem(key, value);
});
}else{
transaction.srem(key, values);
}
},
//
// Private methods
//
bucketKey : function(bucket, keys){
var self = this;
if(Array.isArray(keys)){
return keys.map(function(key){
return self.prefix+'_'+bucket+'@'+key;
});
}else{
return self.prefix+'_'+bucket+'@'+keys;
}
}
}
exports = module.exports = RedisBackend;
|