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Add workers for history to leverage CPU intensive work loading

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This commit is contained in:
Wu Cheng-Han 2016-11-07 21:30:53 +08:00
parent 4ccfdfa538
commit b5920fbbd1
2 changed files with 100 additions and 47 deletions
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79
lib/history.js
View file

@ -2,6 +2,7 @@
//external modules
var async = require('async');
var moment = require('moment');
var childProcess = require('child_process');
//core
var config = require("./config.js");
@ -9,6 +10,9 @@ var logger = require("./logger.js");
var response = require("./response.js");
var models = require("./models");
// workers
var historyUpdater = require("./workers/historyUpdater");
//public
var History = {
historyGet: historyGet,
@ -20,49 +24,50 @@ var History = {
var caches = {};
//update when the history is dirty
var updaterIsBusy = false;
var updater = setInterval(function () {
if (updaterIsBusy) return;
var deleted = [];
async.each(Object.keys(caches), function (key, callback) {
var _caches = {};
Object.keys(caches).forEach(function (key) {
var cache = caches[key];
if (cache.isDirty) {
if (config.debug) logger.info("history updater found dirty history: " + key);
var history = parseHistoryToArray(cache.history);
finishUpdateHistory(key, history, function (err, count) {
if (err) return callback(err, null);
if (!count) return callback(null, null);
_caches[key] = cache.history;
cache.isDirty = false;
cache.updateAt = Date.now();
return callback(null, null);
});
} else {
if (moment().isAfter(moment(cache.updateAt).add(5, 'minutes'))) {
deleted.push(key);
}
return callback(null, null);
}
}, function (err) {
if (err) return logger.error('history updater error', err);
});
// delete specified caches
for (var i = 0, l = deleted.length; i < l; i++) {
caches[deleted[i]].history = {};
delete caches[deleted[i]];
}
}, 1000);
function finishUpdateHistory(userid, history, callback) {
models.User.update({
history: JSON.stringify(history)
}, {
where: {
id: userid
}
}).then(function (count) {
return callback(null, count);
}).catch(function (err) {
return callback(err, null);
if (Object.keys(_caches).length <= 0) return;
updaterIsBusy = true;
var worker = childProcess.fork("./lib/workers/historyUpdater.js");
if (config.debug) logger.info('history updater worker process started');
worker.send({
msg: 'update history',
caches: _caches
});
}
worker.on('message', function (data) {
if (!data || !data.msg || !data.userid) return;
var cache = caches[data.userid];
if (!cache) return;
switch(data.msg) {
case 'check':
cache.updateAt = Date.now();
break;
}
});
worker.on('close', function (code) {
updaterIsBusy = false;
if (config.debug) logger.info('history updater worker process exited with code ' + code);
});
}, 1000);
function isReady() {
var dirtyCount = 0;
@ -101,7 +106,7 @@ function getHistory(userid, callback) {
}
function setHistory(userid, history) {
if (Array.isArray(history)) history = parseHistoryToObject(history);
if (Array.isArray(history)) history = historyUpdater.parseHistoryToObject(history);
if (!caches[userid]) {
caches[userid] = {
history: {},
@ -130,31 +135,13 @@ function updateHistory(userid, noteId, document) {
}
}
function parseHistoryToArray(history) {
var _history = [];
Object.keys(history).forEach(function (key) {
var item = history[key];
_history.push(item);
});
return _history;
}
function parseHistoryToObject(history) {
var _history = {};
for (var i = 0, l = history.length; i < l; i++) {
var item = history[i];
_history[item.id] = item;
}
return _history;
}
function historyGet(req, res) {
if (req.isAuthenticated()) {
getHistory(req.user.id, function (err, history) {
if (err) return response.errorInternalError(res);
if (!history) return response.errorNotFound(res);
res.send({
history: parseHistoryToArray(history)
history: historyUpdater.parseHistoryToArray(history)
});
});
} else {

66
lib/workers/historyUpdater.js Normal file
View file

@ -0,0 +1,66 @@
// external modules
var async = require('async');
// core
var config = require("../config.js");
var logger = require("../logger.js");
var models = require("../models");
process.on('message', function (data) {
if (!data || !data.msg || data.msg !== 'update history' || !data.caches) return process.exit();
var caches = data.caches;
async.each(Object.keys(caches), function (key, callback) {
var cache = caches[key];
if (config.debug) logger.info("history updater found dirty history: " + key);
var history = parseHistoryToArray(cache);
finishUpdateHistory(key, history, function (err, count) {
if (err) return callback(err, null);
if (!count) return callback(null, null);
process.send({
msg: 'check',
userid: key
});
return callback(null, null);
});
}, function (err) {
if (err) logger.error('history updater error', err);
process.exit();
});
});
function finishUpdateHistory(userid, history, callback) {
models.User.update({
history: JSON.stringify(history)
}, {
where: {
id: userid
}
}).then(function (count) {
return callback(null, count);
}).catch(function (err) {
return callback(err, null);
});
}
function parseHistoryToArray(history) {
var _history = [];
Object.keys(history).forEach(function (key) {
var item = history[key];
_history.push(item);
});
return _history;
}
function parseHistoryToObject(history) {
var _history = {};
for (var i = 0, l = history.length; i < l; i++) {
var item = history[i];
_history[item.id] = item;
}
return _history;
}
module.exports = {
parseHistoryToArray: parseHistoryToArray,
parseHistoryToObject: parseHistoryToObject
};