LocalCDN: Webresource manager to request and cache web resources, aiming to make web requests faster and more reliable.
目前为
此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.gf.qytechs.cn/scripts/449580/1081615/LocalCDN.js
/* eslint-disable no-multi-spaces */
// ==UserScript==
// @name LocalCDN
// @namespace LocalCDN
// @version 0.1
// @description LocalCDN: Webresource manager to request and cache web resources, aiming to make web requests faster and more reliable.
// @author PY-DNG
// @license GPL-v3
// @grant none
// @grant GM_setValue
// @grant GM_getValue
// @grant GM_xmlhttpRequest
// ==/UserScript==
var LocalCDN;
(function() {
// Arguments: level=LogLevel.Info, logContent, asObject=false
// Needs one call "DoLog();" to get it initialized before using it!
function DoLog() {
// Get window
const win = (typeof(unsafeWindow) === 'object' && unsafeWindow !== null) ? unsafeWindow : window;
// Global log levels set
win.LogLevel = {
None: 0,
Error: 1,
Success: 2,
Warning: 3,
Info: 4,
}
win.LogLevelMap = {};
win.LogLevelMap[LogLevel.None] = {
prefix: '',
color: 'color:#ffffff'
}
win.LogLevelMap[LogLevel.Error] = {
prefix: '[Error]',
color: 'color:#ff0000'
}
win.LogLevelMap[LogLevel.Success] = {
prefix: '[Success]',
color: 'color:#00aa00'
}
win.LogLevelMap[LogLevel.Warning] = {
prefix: '[Warning]',
color: 'color:#ffa500'
}
win.LogLevelMap[LogLevel.Info] = {
prefix: '[Info]',
color: 'color:#888888'
}
win.LogLevelMap[LogLevel.Elements] = {
prefix: '[Elements]',
color: 'color:#000000'
}
// Current log level
DoLog.logLevel = win.isPY_DNG ? LogLevel.Info : LogLevel.Warning; // Info Warning Success Error
// Log counter
DoLog.logCount === undefined && (DoLog.logCount = 0);
// Get args
let level, logContent, asObject;
switch (arguments.length) {
case 1:
level = LogLevel.Info;
logContent = arguments[0];
asObject = false;
break;
case 2:
level = arguments[0];
logContent = arguments[1];
asObject = false;
break;
case 3:
level = arguments[0];
logContent = arguments[1];
asObject = arguments[2];
break;
default:
level = LogLevel.Info;
logContent = 'DoLog initialized.';
asObject = false;
break;
}
// Log when log level permits
if (level <= DoLog.logLevel) {
let msg = '%c' + LogLevelMap[level].prefix;
let subst = LogLevelMap[level].color;
if (asObject) {
msg += ' %o';
} else {
switch (typeof(logContent)) {
case 'string':
msg += ' %s';
break;
case 'number':
msg += ' %d';
break;
case 'object':
msg += ' %o';
break;
}
}
if (++DoLog.logCount > 512) {
console.clear();
DoLog.logCount = 0;
}
console.log(msg, subst, logContent);
}
}
DoLog();
LocalCDN = _LocalCDN;
// Loads web resources and saves them to GM-storage
// Tries to load web resources from GM-storage in subsequent calls
// Updates resources every $(this.expire) hours, or use $(this.refresh) function to update all resources instantly
// Dependencies: GM_getValue(), GM_setValue(), requestText(), AsyncManager()
function _LocalCDN(expire=72) {
const LC = this;
const _GM_getValue = GM_getValue;
const _GM_setValue = GM_setValue;
const KEY_LOCALCDN = 'LOCAL-CDN';
const KEY_LOCALCDN_VERSION = 'version';
const VALUE_LOCALCDN_VERSION = '0.3';
// Default expire time (by hour)
LC.expire = expire;
// Try to get resource content from loaclCDN first, if failed/timeout, request from web && save to LocalCDN
// Accepts callback only: onload & onfail(optional)
// Returns true if got from LocalCDN, false if got from web
LC.get = function(url, onload, args=[], onfail=function(){}) {
const CDN = _GM_getValue(KEY_LOCALCDN, {});
const resource = CDN[url];
const time = (new Date()).getTime();
if (resource && resource.content !== null && !expired(time, resource.time)) {
onload.apply(null, [resource.content].concat(args));
return true;
} else {
LC.request(url, _onload, [], onfail);
return false;
}
function _onload(content) {
onload.apply(null, [content].concat(args));
}
}
// Generate resource obj and set to CDN[url]
// Returns resource obj
// Provide content means load success, provide null as content means load failed
LC.set = function(url, content) {
const CDN = _GM_getValue(KEY_LOCALCDN, {});
const time = (new Date()).getTime();
const resource = {
url: url,
time: time,
content: content,
success: content !== null ? (CDN[url] ? CDN[url].success + 1 : 1) : (CDN[url] ? CDN[url].success : 0),
fail: content === null ? (CDN[url] ? CDN[url].fail + 1 : 1) : (CDN[url] ? CDN[url].fail : 0),
};
CDN[url] = resource;
_GM_setValue(KEY_LOCALCDN, CDN);
return resource;
}
// Delete one resource from LocalCDN
LC.delete = function(url) {
const CDN = _GM_getValue(KEY_LOCALCDN, {});
if (!CDN[url]) {
return false;
} else {
delete CDN[url];
_GM_setValue(KEY_LOCALCDN, CDN);
return true;
}
}
// Delete all resources in LocalCDN
LC.clear = function() {
_GM_setValue(KEY_LOCALCDN, {});
upgradeConfig();
}
// List all resource saved in LocalCDN
LC.list = function() {
const CDN = _GM_getValue(KEY_LOCALCDN, {});
const urls = LC.listurls();
return LC.listurls().map((url) => (CDN[url]));
}
// List all resource's url saved in LocalCDN
LC.listurls = function() {
return Object.keys(_GM_getValue(KEY_LOCALCDN, {})).filter((url) => (url !== KEY_LOCALCDN_VERSION));
}
// Request content from web and save it to CDN[url]
// Accepts callbacks only: onload & onfail(optional)
LC.request = function(url, onload, args=[], onfail=function(){}) {
const CDN = _GM_getValue(KEY_LOCALCDN, {});
requestText(url, _onload, [], _onfail);
function _onload(content) {
LC.set(url, content);
onload.apply(null, [content].concat(args));
}
function _onfail() {
LC.set(url, null);
onfail(url);
}
}
// Re-request all resources in CDN instantly, ignoring LC.expire
LC.refresh = function(callback, args=[]) {
const urls = LC.listurls();
const AM = new AsyncManager();
AM.onfinish = function() {
callback.apply(null, [].concat(args))
};
for (const url of urls) {
AM.add();
LC.request(url, function() {
AM.finish();
});
}
AM.finishEvent = true;
}
// Sort src && srcset, to get a best request sorting
LC.sort = function(srcset) {
const CDN = _GM_getValue(KEY_LOCALCDN, {});
const result = {srclist: [], lists: []};
const lists = result.lists;
const srclist = result.srclist;
const suc_rec = lists[0] = []; // Recent successes take second (not expired yet)
const suc_old = lists[1] = []; // Old successes take third
const fails = lists[2] = []; // Fails & unused take the last place
const time = (new Date()).getTime();
// Make lists
for (const s of srcset) {
const resource = CDN[s];
if (resource && resource.content !== null) {
if (!expired(resource.time, time)) {
suc_rec.push(s);
} else {
suc_old.push(s);
}
} else {
fails.push(s);
}
}
// Sort lists
// Recently successed: Choose most recent ones
suc_rec.sort((res1, res2) => (res2.time - res1.time));
// Successed long ago or failed: Sort by success rate & tried time
[suc_old, fails].forEach((arr) => (arr.sort(sorting)));
// Push all resources into seclist
[suc_rec, suc_old, fails].forEach((arr) => (arr.forEach((res) => (srclist.push(res)))));
return result;
function sorting(res1, res2) {
const sucRate1 = (res1.success+1) / (res1.fail+1);
const sucRate2 = (res2.success+1) / (res2.fail+1);
if (sucRate1 !== sucRate2) {
// Success rate: high to low
return sucRate2 - sucRate1;
} else {
// Tried time: less to more
// Less tried time means newer added source
return (res1.success+res1.fail) - (res2.success+res2.fail);
}
}
}
function upgradeConfig() {
const CDN = _GM_getValue(KEY_LOCALCDN, {});
switch(CDN[KEY_LOCALCDN_VERSION]) {
case undefined:
init();
break;
case '0.1':
v01_To_v02();
logUpgrade();
break;
case '0.2':
v01_To_v02();
v02_To_v03();
logUpgrade();
break;
case VALUE_LOCALCDN_VERSION:
DoLog('LocalCDN is in latest version.');
break;
default:
DoLog(LogLevel.Error, 'LocalCDN.upgradeConfig: Invalid config version({V}) for LocalCDN. '.replace('{V}', CDN[KEY_LOCALCDN_VERSION]));
}
CDN[KEY_LOCALCDN_VERSION] = VALUE_LOCALCDN_VERSION;
_GM_setValue(KEY_LOCALCDN, CDN);
function logUpgrade() {
DoLog(LogLevel.Success, 'LocalCDN successfully upgraded From v{V1} to v{V2}. '.replaceAll('{V1}', CDN[KEY_LOCALCDN_VERSION]).replaceAll('{V2}', VALUE_LOCALCDN_VERSION));
}
function init() {
// Nothing to do here
}
function v01_To_v02() {
const urls = LC.listurls();
for (const url of urls) {
if (url === KEY_LOCALCDN_VERSION) {continue;}
CDN[url] = {
url: url,
time: 0,
content: CDN[url]
};
}
}
function v02_To_v03() {
const urls = LC.listurls();
for (const url of urls) {
CDN[url].success = CDN[url].fail = 0;
}
}
}
function clearExpired() {
const resources = LC.list();
const time = (new Date()).getTime();
for (const resource of resources) {
expired(resource.time, time) && LC.delete(resource.url);
}
}
function expired(t1, t2) {
return (t1 - t2) > (LC.expire * 60 * 60 * 1000);
}
upgradeConfig();
clearExpired();
}
function requestText(url, callback, args=[], onfail=function(){}) {
GM_xmlhttpRequest({
method: 'GET',
url: url,
responseType: 'text',
timeout: 45*1000,
onload: function(response) {
const text = response.responseText;
const argvs = [text].concat(args);
callback.apply(null, argvs);
},
onerror: onfail,
ontimeout: onfail,
onabort: onfail,
})
}
function AsyncManager() {
const AM = this;
// Ongoing xhr count
this.taskCount = 0;
// Whether generate finish events
let finishEvent = false;
Object.defineProperty(this, 'finishEvent', {
configurable: true,
enumerable: true,
get: () => (finishEvent),
set: (b) => {
finishEvent = b;
b && AM.taskCount === 0 && AM.onfinish && AM.onfinish();
}
});
// Add one task
this.add = () => (++AM.taskCount);
// Finish one task
this.finish = () => ((--AM.taskCount === 0 && AM.finishEvent && AM.onfinish && AM.onfinish(), AM.taskCount));
}
}) ();
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