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index.js
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index.js
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var path = require('path');
var crypto = require('crypto');
var Promise = require('bluebird');
var redis = Promise.promisifyAll(require('redis'));
var through2 = require('through2');
var utils = require('ympc-utils');
exports = module.exports = db;
var padTime = utils.padTime;
var removeNonScalars = utils.removeNonScalars;
function db (options) {
options = options || {};
if (!options.socket) {
options.host = options.host || '127.0.0.1';
options.port = parseInt(options.port, 10) || 6379;
}
var redisOptions = {};
if (options.password) { redisOptions.auth_pass = options.password; }
var client;
if (options.socket) {
client = redis.createClient(options.socket, redisOptions);
} else {
client = redis.createClient(options.port, options.host, redisOptions);
}
function makeShowKey (showId) {
if (typeof showId === 'object') { showId = showId.id; }
return 'show:' + showId;
}
function makeEpisodeKey (showId, episodeSien) {
if (typeof episodeSien === 'object') { episodeSien = episodeSien.sien; }
if (typeof episodeSien === 'undefined') { episodeSien = 'latest'; }
return makeShowKey(showId) + ':episode:' + episodeSien;
}
function makeEpisodesKey (showId) {
return makeShowKey(showId) + ':episodes';
}
function makeSubscriptionsKey (userId) {
return makeUserKey(userId) + ':subscriptions';
}
function makeSubscribersKey (showId) {
return makeShowKey(showId) + ':subscribers'
}
function makeUserKey (userId) {
return 'user:' + userId
}
function makeFeedKey(userId) {
return makeUserKey(userId) + ':feed';
}
function makeLogKey (type, time) {
return 'log:' + type + ':' + padTime(time);
}
function makeActiveShowsKey () {
return 'shows:active';
}
function makeInactiveShowsKey () {
return 'shows:inactive';
}
function makeYoFailCountKey (userId) {
return makeUserKey(userId) + ':yo-fail-count';
}
function close () {
client.quit();
}
function addTimestamp (obj) {
return getTime()
.then(function (time) {
obj.timestamp = time;
return obj;
});
}
function saveShow (show, callback) {
var saveDetails = function (show) {
var key = makeShowKey(show);
show = removeNonScalars(show);
return client.hmsetAsync(key, show)
.return(show);
};
var removeFromWrongSet = function (show) {
var remKey = show.active ? makeInactiveShowsKey() : makeActiveShowsKey();
return client.sremAsync(remKey, show.id)
.return(show);
};
var addToRightSet = function (show) {
var addKey = show.active ? makeActiveShowsKey() : makeInactiveShowsKey();
return client.saddAsync(addKey, show.id)
.return(show);
};
return addTimestamp(show)
.then(saveDetails)
.then(removeFromWrongSet)
.then(addToRightSet)
.nodeify(callback);
}
function saveEpisode (showId, episode, callback) {
showId = typeof showId === 'object' ? showId.id : showId;
var addShowId = function (showId) {
return function (episode) {
episode.show_id = showId;
return episode;
};
};
var saveDetails = function (episode) {
var key = makeEpisodeKey(episode.show_id, episode);
return client.existsAsync(key)
.then(function (exists) {
if (exists) { return episode; }
return client.hmsetAsync(key, episode)
.return(episode);
});
};
var addToSet = function (episode) {
var episodeKey = makeEpisodeKey(episode.show_id, episode);
var key = makeEpisodesKey(showId);
return client.saddAsync(key, episodeKey)
.return(episode);
};
return Promise.resolve(episode)
.then(addShowId(showId))
.then(addTimestamp)
.then(saveDetails)
.then(addToSet)
.nodeify(callback);
}
function saveLatestEpisode (showId, episodeSien, callback) {
var key = makeEpisodeKey(showId);
var episodeKey = makeEpisodeKey(showId, episodeSien);
return client.hgetallAsync(episodeKey)
.then(function (episode) {
return client.hmsetAsync(key, episode)
.return(episode);
})
.nodeify(callback);
}
function getShow (showId, callback) {
var key = makeShowKey(showId);
return client.hgetallAsync(key)
.nodeify(callback);
}
function getLatestEpisode (showId, callback) {
var key = makeEpisodeKey(showId);
return client.hgetallAsync(key)
.nodeify(callback);
}
function getTime (callback) {
return client.timeAsync()
.then(function (t) {
return (t[0] * 1000) + Math.round(t[1] / 1000);
})
.nodeify(callback);
}
function logScan (callback) {
var writeLog = function (time) {
var key = 'latest_scan:start';
return client.setAsync(key, time);
};
return getTime()
.then(writeLog)
.nodeify(callback);
}
function getActiveShowIds (callback) {
return client.smembersAsync(makeActiveShowsKey())
.nodeify(callback);
}
function getInactiveShowIds (callback) {
return client.smembersAsync(makeInactiveShowsKey())
.nodeify(callback);
}
function createActiveShowsStream () {
var stream = through2.obj();
function writeData () {
getActiveShowIds(function (err, showIds) {
if (err) { return stream.end(); }
showIds.forEach(function (showId) {
stream.write({
imdb_id: showId
});
});
stream.end();
});
}
process.nextTick(writeData);
return stream;
}
function log (type, data, callback) {
var writeLog = function (time) {
var key = makeLogKey(type, time);
data.time = time;
return client.hmsetAsync(key, data);
};
return getTime()
.then(writeLog)
.nodeify(callback);
}
function getSubscriptions (userId, callback) {
var key = makeSubscriptionsKey(userId);
return client.smembersAsync(key)
.nodeify(callback);
}
function getSubscribers (showId, callback) {
var key = makeSubscribersKey(showId);
return client.smembersAsync(key)
.nodeify(callback);
}
function subscribeShow (userId, showId, callback) {
var subscribe = function () {
var subscriptionsKey = makeSubscriptionsKey(userId);
var subscribersKey = makeSubscribersKey(showId);
var multi = Promise.promisifyAll(client.multi());
multi.sadd(subscribersKey, userId);
multi.sadd(subscriptionsKey, showId);
return multi.execAsync();
};
return subscribe(userId, showId)
.then(addLatestEpisodeToFeed.bind(null, userId, showId))
.nodeify(callback);
}
function unsubscribeShow (userId, showId, callback) {
var unsubscribe = function (userId, showId) {
var subscriptionsKey = makeSubscriptionsKey(userId);
var subscribersKey = makeSubscribersKey(showId);
var multi = Promise.promisifyAll(client.multi());
multi.srem(subscribersKey, userId);
multi.srem(subscriptionsKey, showId);
return multi.execAsync();
};
return unsubscribe(userId, showId)
.then(removeShowFromFeed.bind(null, userId, showId))
.nodeify(callback);
}
function removeShowFromFeed (userId, showId, callback) {
var feedKey = makeFeedKey(userId);
var showKey = makeShowKey(showId);
client.smembersAsync(feedKey)
.then(function (episodeKeys) {
var multi = Promise.promisifyAll(client.multi());
episodeKeys = episodeKeys.filter(function (key) {
return key.indexOf(showKey) !== -1;
});
episodeKeys.forEach(function (episodeKey) {
multi.srem(feedKey, episodeKey);
});
return multi.execAsync();
})
.nodeify(callback);
}
function removeItemFromFeed (userId, showId, sien, callback) {
var feedKey = makeFeedKey(userId);
var episodeKey = makeEpisodeKey(showId, sien);
return client.sremAsync(feedKey, episodeKey)
.nodeify(callback);
}
function addLatestEpisodeToFeed (userId, show, callback) {
return getLatestEpisode(show)
.then(function (episode) {
if (!episode) { return Promise.resolve(); }
var episodeKey = makeEpisodeKey(show, episode);
var feedKey = makeFeedKey(userId);
return client.saddAsync(feedKey, episodeKey);
})
.nodeify(callback);
}
function getFeed(userId, callback) {
var getFeedItemKeys = function (userId) {
var feedKey = makeFeedKey(userId);
return client.smembersAsync(feedKey);
};
var getEpisodeByKey = function (episodeKey) {
return client.hgetallAsync(episodeKey);
};
var getFeedItem = function (episodeKey) {
return getEpisodeByKey(episodeKey)
.then(function (episode) {
return getShow(episode.show_id)
.then(function (show) {
return {
show_id: show.id,
imdb_id: show.imdb_id,
title: show.title,
episide_title: episode.title,
sien: episode.sien,
season: episode.season,
episode: episode.episode,
poster: show.poster,
first_aired: episode.first_aired,
timestamp: episode.timestamp
};
});
});
};
var filterAndSort = function (feedItems) {
return feedItems
.filter(function (result) {
return !!result;
})
.sort(function (a, b) {
var ats = a.timestamp || a.first_aired;
var bts = b.timestamp || b.first_aired;
return bts - ats;
});
};
return getFeedItemKeys(userId)
.map(getFeedItem)
.then(filterAndSort)
.nodeify(callback);
}
function createToken (length, callback) {
return new Promise(function (resolve, reject) {
crypto.randomBytes(length, function (err, token) {
if (err) { return reject(err); }
if (!token) { return reject(new Error('Failed to generate token')); }
resolve(token.toString('hex'));
});
}).nodeify(callback);
}
function incrementYoFailCount (userId, callback) {
var key = makeYoFailCountKey(userId);
return client.incrAsync(key)
.nodeify(callback);
}
function resetYoFailCount (userId, callback) {
var key = makeYoFailCountKey(userId);
return client.delAsync(key)
.nodeify(callback);
}
return {
saveShow: saveShow,
saveEpisode: saveEpisode,
saveLatestEpisode: saveLatestEpisode,
getShow: getShow,
getLatestEpisode: getLatestEpisode,
getActiveShowIds: getActiveShowIds,
getInactiveShowIds: getInactiveShowIds,
createActiveShowsStream: createActiveShowsStream,
log: log,
getSubscribers: getSubscribers,
getSubscriptions: getSubscriptions,
subscribeShow: subscribeShow,
unsubscribeShow: unsubscribeShow,
removeItemFromFeed: removeItemFromFeed,
addLatestEpisodeToFeed: addLatestEpisodeToFeed,
getFeed: getFeed,
getTime: getTime,
logScan: logScan,
incrementYoFailCount: incrementYoFailCount,
resetYoFailCount: resetYoFailCount,
close: close
};
}