75 lines
2.2 KiB
JavaScript
75 lines
2.2 KiB
JavaScript
/**
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* User: simon
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* Date: 23/08/2011
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* Time: 21:10
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* Desc: retrieves users database_name from the redis metadatabase based on subdomain/username
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*/
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var RedisPool = require("./redis_pool")
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, _ = require('underscore')
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, Step = require('step');
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module.exports = function() {
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var me = {
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metadata_database: 5,
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user_key: "rails:users:<%= username %>"
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};
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/**
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* Get the database name for this particular subdomain/username
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*
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* @param req - standard express req object. importantly contains host information
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* @param callback
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*/
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me.getDatabase = function(req, callback) {
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// strip subdomain from header host
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var username = req.headers.host.split('.')[0]
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var redisKey = _.template(this.user_key, {username: username});
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this.retrieve(redisKey, 'database_name', callback);
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};
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/**
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* Get the user id for this particular subdomain/username
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*
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* @param req - standard express req object. importantly contains host information
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* @param callback
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*/
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me.getId= function(req, callback) {
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// strip subdomain from header host
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var username = req.headers.host.split('.')[0]
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var redisKey = _.template(this.user_key, {username: username});
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this.retrieve(redisKey, 'id', callback);
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};
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/**
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* Make a data access call to Redis
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*
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* @param redisKey - the base redis key where the metadata hash lives
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* @param hashKey - the specific metadata you want to retrieve
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* @param callback - function to pass metadata too. err,data args
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*/
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me.retrieve = function(redisKey, hashKey, callback) {
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var that = this;
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var redisClient;
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Step(
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function getRedisClient() {
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RedisPool.acquire(that.metadata_database, this);
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},
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function lookupMetadata(data) {
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redisClient = data;
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redisClient.HGET(redisKey, hashKey, this);
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},
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function releaseRedisClient(err, data) {
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if (err) throw err;
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RedisPool.release(that.metadata_database, redisClient);
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callback(err, data);
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}
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);
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};
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return me;
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}(); |