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| /**
MongoDB Backend.
Implementation of the storage backend using MongoDB
*/
"use strict";
var contract = require('./contract');
var async = require('async');
var _ = require('lodash');
function MongoDBBackend(db, prefix){
this.db = db;
this.prefix = typeof prefix !== 'undefined' ? prefix : '';
}
MongoDBBackend.prototype = {
/**
Begins a transaction.
*/
begin : function(){
// returns a transaction object(just an array of functions will do here.)
return [];
},
/**
Ends a transaction (and executes it)
*/
end : function(transaction, cb){
contract(arguments).params('array', 'function').end();
async.series(transaction,function(err){
cb(err instanceof Error? err : undefined);
});
},
/**
Cleans the whole storage.
*/
clean : function(cb){
contract(arguments).params('function').end();
this.db.collections(function(err, collections) {
if (err instanceof Error) return cb(err);
async.forEach(collections,function(coll,innercb){
coll.drop(function(){innercb()}); // ignores errors
},cb);
});
},
/**
Gets the contents at the bucket's key.
*/
get : function(bucket, key, cb){
contract(arguments)
.params('string', 'string', 'function')
.end();
this.db.collection(this.prefix + bucket,function(err,collection){
Iif(err instanceof Error) return cb(err);
collection.findOne({key:key},function(err, doc){
Iif(err) return cb(err);
if(! _.isObject(doc) ) return cb(undefined,[]);
cb(undefined,_.without(_.keys(doc),"key","_id"));
});
});
},
/**
Returns the union of the values in the given keys.
*/
union : function(bucket, keys, cb){
contract(arguments)
.params('string', 'array', 'function')
.end();
this.db.collection(this.prefix + bucket,function(err,collection){
Iif(err instanceof Error) return cb(err);
collection.find({key: { $in: keys }}).toArray(function(err,docs){
Iif(err instanceof Error) return cb(err);
if( ! docs.length ) return cb(undefined, []);
var keyArrays = [];
docs.forEach(function(doc){
keyArrays.push.apply(keyArrays, _.keys(doc));
});
cb(undefined, _.without(_.union(keyArrays),"key","_id"));
});
});
},
/**
Adds values to a given key inside a bucket.
*/
add : function(transaction, bucket, key, values){
contract(arguments)
.params('array', 'string', 'string','string|array')
.end();
Iif(key=="key") throw new Error("Key name 'key' is not allowed.");
var self=this;
transaction.push(function(cb){
values = makeArray(values);
self.db.collection(self.prefix + bucket, function(err,collection){
Iif(err instanceof Error) return cb(err);
// build doc from array values
var doc = {};
values.forEach(function(value){doc[value]=true;});
// update document
collection.update({key:key},{$set:doc},{safe:true,upsert:true},function(err){
Iif(err instanceof Error) return cb(err);
cb(undefined);
});
});
});
},
/**
Delete the given key(s) at the bucket
*/
del : function(transaction, bucket, keys){
contract(arguments)
.params('array', 'string', 'string|array')
.end();
keys = makeArray(keys);
var self= this;
transaction.push(function(cb){
self.db.collection(self.prefix + bucket,function(err,collection){
Iif(err instanceof Error) return cb(err);
collection.remove({key:{$in:keys}},{safe:true},function(err){
Iif(err instanceof Error) return cb(err);
cb(undefined);
});
});
});
},
/**
Removes values from a given key inside a bucket.
*/
remove : function(transaction, bucket, key, values){
contract(arguments)
.params('array', 'string', 'string','string|array')
.end();
var self=this;
values = makeArray(values);
transaction.push(function(cb){
self.db.collection(self.prefix + bucket,function(err,collection){
Iif(err instanceof Error) return cb(err);
// build doc from array values
var doc = {};
values.forEach(function(value){doc[value]=true;});
// update document
collection.update({key:key},{$unset:doc},{safe:true,upsert:true},function(err){
Iif(err instanceof Error) return cb(err);
cb(undefined);
});
});
});
}
}
function makeArray(arr){
return Array.isArray(arr) ? arr : [arr];
}
exports = module.exports = MongoDBBackend;
|