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index.js
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index.js
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var _ = require('lodash');
var async = require('async');
var sql = require('mssql');
var backendDefaults = {
bucketSize: 100,
keySize: 100,
prefix: '',
table: 'Acl',
valueSize: 100
};
function Backend(opts) {
this.opts = _.merge({}, backendDefaults, opts || {});
};
Backend.prototype.add = function (transactions, bucket, key, values) {
var self = this;
var query = "INSERT INTO " + this.getTableName() + " SELECT @bucket AS bucket, @key as [key], @value as value WHERE NOT EXISTS (SELECT * FROM acl WHERE bucket = @bucket AND [key] = @key AND value = @value)";
values = Array.isArray(values) ? values : [values];
transactions.push(function (done) {
self.open(function (err, conn) {
if (err) return done(err);
async.each(values,
function (value, done) {
var req = new sql.Request(conn);
req.input('bucket', sql.VarChar, bucket);
req.input('key', sql.VarChar, key);
req.input('value', sql.VarChar, value);
req.query(query, done);
}, function (err) {
conn.close();
done(err);
}
);
});
});
};
Backend.prototype.begin = function () {
return [];
};
Backend.prototype.clean = function (done) {
var self = this;
this.open(function (err, conn) {
if (err) return done(err);
var req = new sql.Request(conn);
var query = "TRUNCATE TABLE " + self.getTableName();
req.query(query, function (err) {
conn.close();
done(err);
});
});
};
Backend.prototype.del = function (transactions, bucket, keys) {
var self = this;
keys = Array.isArray(keys) ? keys : [keys];
transactions.push(function (done) {
self.open(function (err, conn) {
if (err) return done(err);
var req = new sql.Request(conn);
var query = "DELETE FROM " + self.getTableName() + " WHERE bucket = @bucket AND [key] in (";
req.input('bucket', sql.VarChar, bucket);
keys.forEach(function (key, i) {
req.input('key' + i, sql.VarChar, key);
if (i > 0) query += ',';
query += '@key' + i;
});
query += ")";
req.query(query, function (err) {
conn.close();
done(err);
});
});
});
};
Backend.prototype.end = function (transactions, done) {
async.parallel(transactions, done);
};
Backend.prototype.get = function (bucket, key, done) {
var self = this;
this.open(function (err, conn) {
if (err) return done(err);
var req = new sql.Request(conn);
var query = "SELECT value FROM " + self.getTableName() + " WHERE bucket = @bucket AND [key] = @key";
req.input('bucket', sql.VarChar, bucket);
req.input('key', sql.VarChar, key);
req.query(query, function (err, rows) {
conn.close();
if (err) return done(err);
done(null, _.pluck(rows, 'value'));
});
});
};
Backend.prototype.getTableName = function () {
return this.opts.prefix + this.opts.table;
};
Backend.prototype.open = function (done) {
var query = "IF NOT EXISTS (SELECT * FROM sys.tables WHERE name = '" + this.getTableName() + "') CREATE TABLE " + this.getTableName() + " (bucket VARCHAR(" + this.opts.bucketSize + ") NOT NULL, [key] VARCHAR(" + this.opts.keySize + ") NOT NULL, value VARCHAR(" + this.opts.valueSize + ") NOT NULL, CONSTRAINT " + this.getTableName() + "Constraint UNIQUE (bucket, [key], value))";
var conn = new sql.Connection(this.opts, function (err) {
if (err) return done(err);
var req = new sql.Request(conn);
req.query(query, function (err) {
if (!err) return done(null, conn);
conn.close();
done(err);
});
});
};
Backend.prototype.remove = function (transactions, bucket, key, values) {
var self = this;
values = Array.isArray(values) ? values : [values];
transactions.push(function (done) {
self.open(function (err, conn) {
if (err) return done(err);
var req = new sql.Request(conn);
var query = "DELETE FROM " + self.getTableName() + " WHERE bucket = @bucket AND [key] = @key AND value in (";
req.input('bucket', sql.VarChar, bucket);
req.input('key', sql.VarChar, key);
values.forEach(function (value, i) {
req.input('value' + i, sql.VarChar, value);
if (i > 0) query += ',';
query += '@value' + i;
});
query += ")";
req.query(query, function (err) {
conn.close();
done(err);
});
});
});
};
Backend.prototype.union = function (bucket, keys, done) {
var self = this;
this.open(function (err, conn) {
if (err) return done(err);
var req = new sql.Request(conn);
var query = "SELECT DISTINCT value FROM " + self.getTableName() + " WHERE bucket = @bucket AND [key] in (";
req.input('bucket', sql.VarChar, bucket);
keys.forEach(function (key, i) {
req.input('key' + i, sql.VarChar, key);
if (i > 0) query += ',';
query += '@key' + i;
});
query += ")";
req.query(query, function (err, rows) {
conn.close();
if (err) return done(err);
done(null, _.pluck(rows, 'value'));
});
});
};
module.exports = function (opts) {
return new Backend(opts);
};