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persistency.js
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persistency.js
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var Mongolian = require("mongolian"),
jQuery = require('jquery'),
config = require('./config'),
util = require('util');
var db = new Mongolian(config.mongo.url)
var messages = db.collection("messages")
var memes = db.collection("memes")
var users = db.collection("users")
var titles = db.collection("titles")
var message_votes = db.collection("message_votes")
var SERVUSTALK_USER = { // used for system messages
id: 'ServusTalk',
name: 'ServusTalk',
picture: 'http://www.albinoblacksheep.com/download/icon/googletalk.png'
};
function mergeMessagesWithUsers(messages, users, callback) {
merge = function(messages, users) {
// Maps user_id -> user
users_by_id = {};
for (idx in users) {
users_by_id[users[idx].id] = users[idx];
}
// message.user contains id, but we need a user object
for (idx in messages) {
messages[idx].user = users_by_id[messages[idx].user];
}
callback(messages); };
if (users == null) {
getUsers(function(err, users) {
if (err) {
console.warn('Error getting users: ' + err, err.stack);
} else {
merge(messages, users);
}
});
} else {
merge(messages, users);
}
}
function init() {
users.ensureIndex({id: 1});
messages.ensureIndex({ts: 1});
titles.ensureIndex({ts: 1});
message_votes.ensureIndex({message_ts: 1, user_id: 1}, {unique: true});
saveUser(SERVUSTALK_USER, function(err) {
if (err) {
console.error('Default ServusTalk system user could not be saved. Check persistency.');
}
});
}
function saveMessage(message) {
msg = {
user: message.user.id,
text: message.text,
type: message.type,
ts: message.ts
}
messages.insert(msg);
}
function saveMeme(meme) {
memes.insert(meme);
}
function getMemes(callback) {
memes.find({}, {_id:0}).toArray(callback);
}
function getMessages(lower_date, upper_date, callback) {
messages.find({ts: { $gt: lower_date.getTime(), $lt: upper_date.getTime()} }, { _id : 0 }).toArray(callback);
}
function getMessagesChunk(timestamp, count, callback) {
messages.find({ts: {$gt: timestamp} }, {_id : 0 }).limit(count).sort({ts: 1}).toArray(callback);
}
function getDistinctCheckins(callback) {
messages.find({type : 'CHECKIN'}).toArray(callback);
}
function getMemesChunk(timestamp, count, callback) {
messages.find({ts: {$gt: timestamp}, text : /^\/meme/}, {_id : 0 }).limit(count).sort({ts: 1}).toArray(callback);
}
function isUserWhitelisted(userId, callback) {
users.count({id: userId, acceptedBy: {$exists: true}}, function(err, count) {
if (count > 0)
callback(true);
else
callback(false);
});
}
function updateUser(user, callback) {
users.update({id: user.id}, user, {safe: true}, callback);
}
function saveUser(user, callback) {
users.findOne({id: user.id}, {_id : 0}, function(err, db_user) {
if (!err) {
if (db_user === undefined) {
// First time user, save it
users.insert(user, function(err) {
if (err) {
console.warn('Error inserting new user: ' + user.id);
callback(err);
} else {
callback(false, user, true);
}
});
} else {
// Update existing user
jQuery.extend(true, db_user, user);
updateUser(db_user, function(err) {
if (err) {
console.warn('Error updating user: ' + db_user.id);
callback(err);
} else {
callback(false, db_user, false);
}
});
}
} else {
console.warn('Error searching for user: ' + err);
}
});
}
function getHistory(count, callback) {
messages.find({}, {_id : 0}).limit(count).sort({ts: -1}).toArray(callback);
}
function getUser(id, callback) {
users.findOne({id: id}, {_id : 0}, callback);
}
function getUsers(callback) {
users.find({}, {_id : 0}).toArray(callback);
}
function saveTitle(title) {
titles.insert(title);
}
function getTitle(callback) {
titles.find({}, {_id : 0}).sort({ts: -1}).limit(1).toArray(callback);
}
function getAcceptedUserCount(callback) {
users.count({acceptedBy : {$exists:true}}, callback);
}
function calculateVotes(message, callback) {
uptokes = 0;
downtokes = 0;
message_votes.find({message_ts: message.ts}).forEach(function(message_vote) {
if (message_vote.vote > 0) {
++uptokes;
}
if (message_vote.vote < 0) {
++downtokes;
}
}, function(err) {
if (!err) {
message.uptokes = uptokes;
message.downtokes = downtokes;
delete message._id;
messages.update({ts: message.ts}, message, function(err, value) {
callback(message);
});
} else {
console.warn('Error finding message for saving uptokes.');
}
});
}
function saveVote(message_ts, user_id, vote, callback) {
message_vote = {
message_ts: message_ts,
user_id: user_id,
vote: vote
};
messages.findOne({ts: message_ts}, function(err, message) {
if (message) {
message_votes.save(message_vote);
delete message_vote._id
message_votes.update({message_ts: message_ts, user_id: user_id}, message_vote);
calculateVotes(message, callback);
} else {
console.warn('Invalid message_ts for vote: ' + message_ts);
}
});
}
exports.mergeMessagesWithUsers = mergeMessagesWithUsers
exports.init = init
exports.saveMessage = saveMessage
exports.saveMeme = saveMeme
exports.getMessages = getMessages
exports.getMessagesChunk = getMessagesChunk
exports.getMemes = getMemes
exports.getMemesChunk = getMemesChunk
exports.getDistinctCheckins = getDistinctCheckins
exports.saveUser = saveUser
exports.updateUser = updateUser
exports.getHistory = getHistory
exports.getUser = getUser
exports.getUsers = getUsers
exports.saveTitle = saveTitle
exports.getTitle = getTitle
exports.getAcceptedUserCount = getAcceptedUserCount
exports.isUserWhitelisted = isUserWhitelisted
exports.saveVote = saveVote
exports.SERVUSTALK_USER = SERVUSTALK_USER