/
users.js
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/
users.js
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var thunky = require('thunky');
var once = require('once');
var LRU = require('lru-cache');
var stream = require('stream-wrapper');
var pump = require('pump');
var EventEmitter = require('events').EventEmitter;
var index = require('./search-index');
var getJSON = require('./getJSON');
var level = require('./level');
stream = stream.defaults({objectMode:true});
var cache = new LRU(10000); // TODO: find data-driven configs for caching
var noop = function() {};
var page = function(url, callback) {
var result = [];
var loop = function(i) {
getJSON(url+'?page='+i, function(err, list) {
if (err) return callback(err);
if (!list.length) return callback(null, result);
result = result.concat(list);
if (list.length < 30) return callback(null, result);
loop(i+1);
});
};
loop(1);
};
var fetch = function(username, callback) {
if (!username || username === index.nobody._id) {
return callback(null, {_id:index.nobody._id, following:{}, starred:{}, cached:new Date()});
}
callback = once(callback);
var res = {};
res._id = username;
res.cached = new Date();
page('https://api.github.com/users/'+username+'/following', function(err, following) {
if (err) return callback(err);
res.following = {};
res.following[username] = 1;
following.forEach(function(user) {
res.following[user.login] = 1;
});
if (res.starred) return callback(null, res);
});
page('https://api.github.com/users/'+username+'/starred', function(err, starred) {
if (err) return callback(err);
res.starred = {};
starred.forEach(function(repo) {
if (repo.owner.type !== 'User') return;
var username = repo.full_name.split('/')[0];
if (username === res._id) return;
res.starred[username] = (res.starred[username] || 0)+1;
});
if (res.following) return callback(null, res);
});
};
var fetchAndSave = function(username, callback) {
fetch(username, function(err, user) {
if (err) return callback(err);
level.users.put(user._id, user, function(err) {
if (err) return callback(err);
callback(null, user);
});
});
};
var fetchAndIndex = function(username, callback) {
fetchAndSave(username, function(err, user) {
if (err) return callback(err);
index.update(user, function(err) {
if (err) return callback(err);
callback(null, user);
});
});
};
var updateUser = function(username, callback) {
fetchAndSave(username, function(err, user) {
if (err) return callback(err);
var ready = function() {
var get = thunky(function(callback) {
index.update(user, function(err, updates) {
if (err) return callback(err);
user.updates = updates;
callback(null, user);
});
});
cache.set(username, get);
get(callback);
};
if (!cache.has(username)) return ready();
cache.get(username)(ready);
});
};
exports.update = function(callback) {
var progress = new EventEmitter();
pump(
level.users.createKeyStream(),
stream.transform(function(id, enc, callback) {
updateUser(id, callback);
}),
stream.writable(function(user, enc, callback) {
progress.emit('user', user);
callback();
}),
function(err) {
progress.emit('end', err);
}
);
return progress;
};
exports.get = function(username, callback) {
if (!username) username = index.nobody._id;
if (cache.has(username)) return cache.get(username)(callback);
var get = thunky(function(callback) {
level.users.get(username, function(err, user) {
if (!user) return fetchAndIndex(username, callback);
index.contains(user, function(err, contains) {
if (contains) return callback(null, user);
index.update(user, function(err) {
if (err) return callback(err);
callback(null, user);
});
});
});
});
cache.set(username, get);
get(callback);
};
exports.search = function(username, query, opts, callback) {
if (typeof opts === 'function') return exports.search(username, query, null, opts);
if (!opts) opts = {};
exports.get(username, function(err, user) {
if (err) return callback(err);
if (!user) return callback(new Error('user not found'));
index.search(user, query, opts, callback);
});
};