mirror of
https://github.com/louislam/uptime-kuma.git
synced 2024-12-14 10:23:16 +02:00
820 lines
28 KiB
JavaScript
820 lines
28 KiB
JavaScript
let url = require("url");
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let MemoryCache = require("./memory-cache");
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let t = {
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ms: 1,
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second: 1000,
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minute: 60000,
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hour: 3600000,
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day: 3600000 * 24,
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week: 3600000 * 24 * 7,
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month: 3600000 * 24 * 30,
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};
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let instances = [];
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let matches = function (a) {
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return function (b) {
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return a === b;
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};
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};
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let doesntMatch = function (a) {
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return function (b) {
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return !matches(a)(b);
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};
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};
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let logDuration = function (d, prefix) {
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let str = d > 1000 ? (d / 1000).toFixed(2) + "sec" : d + "ms";
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return "\x1b[33m- " + (prefix ? prefix + " " : "") + str + "\x1b[0m";
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};
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function getSafeHeaders(res) {
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return res.getHeaders ? res.getHeaders() : res._headers;
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}
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function ApiCache() {
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let memCache = new MemoryCache();
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let globalOptions = {
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debug: false,
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defaultDuration: 3600000,
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enabled: true,
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appendKey: [],
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jsonp: false,
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redisClient: false,
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headerBlacklist: [],
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statusCodes: {
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include: [],
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exclude: [],
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},
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events: {
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expire: undefined,
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},
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headers: {
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// 'cache-control': 'no-cache' // example of header overwrite
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},
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trackPerformance: false,
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respectCacheControl: false,
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};
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let middlewareOptions = [];
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let instance = this;
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let index = null;
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let timers = {};
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let performanceArray = []; // for tracking cache hit rate
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instances.push(this);
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this.id = instances.length;
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/**
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* Logs a message to the console if the `DEBUG` environment variable is set.
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* @param {string} a - The first argument to log.
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* @param {string} b - The second argument to log.
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* @param {string} c - The third argument to log.
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* @param {string} d - The fourth argument to log, and so on... (optional)
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*
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* Generated by Trelent
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*/
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function debug(a, b, c, d) {
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let arr = ["\x1b[36m[apicache]\x1b[0m", a, b, c, d].filter(function (arg) {
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return arg !== undefined;
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});
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let debugEnv = process.env.DEBUG && process.env.DEBUG.split(",").indexOf("apicache") !== -1;
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return (globalOptions.debug || debugEnv) && console.log.apply(null, arr);
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}
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/**
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* Returns true if the given request and response should be logged.
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* @param {Object} request The HTTP request object.
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* @param {Object} response The HTTP response object.
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*
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* Generated by Trelent
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*/
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function shouldCacheResponse(request, response, toggle) {
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let opt = globalOptions;
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let codes = opt.statusCodes;
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if (!response) {
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return false;
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}
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if (toggle && !toggle(request, response)) {
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return false;
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}
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if (codes.exclude && codes.exclude.length && codes.exclude.indexOf(response.statusCode) !== -1) {
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return false;
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}
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if (codes.include && codes.include.length && codes.include.indexOf(response.statusCode) === -1) {
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return false;
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}
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return true;
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}
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/**
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* Adds a key to the index.
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* @param {string} key The key to add.
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*
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* Generated by Trelent
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*/
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function addIndexEntries(key, req) {
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let groupName = req.apicacheGroup;
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if (groupName) {
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debug("group detected \"" + groupName + "\"");
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let group = (index.groups[groupName] = index.groups[groupName] || []);
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group.unshift(key);
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}
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index.all.unshift(key);
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}
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/**
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* Returns a new object containing only the whitelisted headers.
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* @param {Object} headers The original object of header names and values.
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* @param {Array.<string>} globalOptions.headerWhitelist An array of strings representing the whitelisted header names to keep in the output object.
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*
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* Generated by Trelent
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*/
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function filterBlacklistedHeaders(headers) {
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return Object.keys(headers)
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.filter(function (key) {
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return globalOptions.headerBlacklist.indexOf(key) === -1;
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})
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.reduce(function (acc, header) {
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acc[header] = headers[header];
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return acc;
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}, {});
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}
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/**
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* @param {Object} headers The response headers to filter.
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* @returns {Object} A new object containing only the whitelisted response headers.
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*
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* Generated by Trelent
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*/
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function createCacheObject(status, headers, data, encoding) {
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return {
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status: status,
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headers: filterBlacklistedHeaders(headers),
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data: data,
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encoding: encoding,
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timestamp: new Date().getTime() / 1000, // seconds since epoch. This is used to properly decrement max-age headers in cached responses.
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};
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}
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/**
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* Sets a cache value for the given key.
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* @param {string} key The cache key to set.
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* @param {*} value The cache value to set.
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* @param {number} duration How long in milliseconds the cached response should be valid for (defaults to 1 hour).
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*
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* Generated by Trelent
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*/
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function cacheResponse(key, value, duration) {
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let redis = globalOptions.redisClient;
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let expireCallback = globalOptions.events.expire;
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if (redis && redis.connected) {
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try {
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redis.hset(key, "response", JSON.stringify(value));
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redis.hset(key, "duration", duration);
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redis.expire(key, duration / 1000, expireCallback || function () {});
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} catch (err) {
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debug("[apicache] error in redis.hset()");
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}
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} else {
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memCache.add(key, value, duration, expireCallback);
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}
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// add automatic cache clearing from duration, includes max limit on setTimeout
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timers[key] = setTimeout(function () {
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instance.clear(key, true);
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}, Math.min(duration, 2147483647));
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}
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/**
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* Appends content to the response.
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* @param {string|Buffer} content The content to append.
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*
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* Generated by Trelent
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*/
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function accumulateContent(res, content) {
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if (content) {
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if (typeof content == "string") {
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res._apicache.content = (res._apicache.content || "") + content;
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} else if (Buffer.isBuffer(content)) {
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let oldContent = res._apicache.content;
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if (typeof oldContent === "string") {
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oldContent = !Buffer.from ? new Buffer(oldContent) : Buffer.from(oldContent);
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}
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if (!oldContent) {
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oldContent = !Buffer.alloc ? new Buffer(0) : Buffer.alloc(0);
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}
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res._apicache.content = Buffer.concat(
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[oldContent, content],
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oldContent.length + content.length
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);
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} else {
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res._apicache.content = content;
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}
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}
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}
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/**
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* Monkeypatches the response object to add cache control headers and create a cache object.
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* @param {Object} req - The request object.
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* @param {Object} res - The response object.
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*
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* Generated by Trelent
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*/
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function makeResponseCacheable(req, res, next, key, duration, strDuration, toggle) {
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// monkeypatch res.end to create cache object
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res._apicache = {
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write: res.write,
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writeHead: res.writeHead,
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end: res.end,
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cacheable: true,
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content: undefined,
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};
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// append header overwrites if applicable
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Object.keys(globalOptions.headers).forEach(function (name) {
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res.setHeader(name, globalOptions.headers[name]);
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});
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res.writeHead = function () {
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// add cache control headers
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if (!globalOptions.headers["cache-control"]) {
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if (shouldCacheResponse(req, res, toggle)) {
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res.setHeader("cache-control", "max-age=" + (duration / 1000).toFixed(0));
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} else {
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res.setHeader("cache-control", "no-cache, no-store, must-revalidate");
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}
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}
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res._apicache.headers = Object.assign({}, getSafeHeaders(res));
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return res._apicache.writeHead.apply(this, arguments);
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};
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// patch res.write
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res.write = function (content) {
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accumulateContent(res, content);
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return res._apicache.write.apply(this, arguments);
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};
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// patch res.end
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res.end = function (content, encoding) {
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if (shouldCacheResponse(req, res, toggle)) {
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accumulateContent(res, content);
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if (res._apicache.cacheable && res._apicache.content) {
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addIndexEntries(key, req);
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let headers = res._apicache.headers || getSafeHeaders(res);
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let cacheObject = createCacheObject(
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res.statusCode,
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headers,
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res._apicache.content,
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encoding
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);
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cacheResponse(key, cacheObject, duration);
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// display log entry
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let elapsed = new Date() - req.apicacheTimer;
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debug("adding cache entry for \"" + key + "\" @ " + strDuration, logDuration(elapsed));
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debug("_apicache.headers: ", res._apicache.headers);
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debug("res.getHeaders(): ", getSafeHeaders(res));
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debug("cacheObject: ", cacheObject);
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}
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}
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return res._apicache.end.apply(this, arguments);
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};
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next();
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}
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/**
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* @param {Request} request
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* @param {Response} response
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* @returns {boolean|undefined} true if the request should be cached, false otherwise. If undefined, defaults to true.
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*
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* Generated by Trelent
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*/
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function sendCachedResponse(request, response, cacheObject, toggle, next, duration) {
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if (toggle && !toggle(request, response)) {
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return next();
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}
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let headers = getSafeHeaders(response);
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// Modified by @louislam, removed Cache-control, since I don't need client side cache!
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// Original Source: https://github.com/kwhitley/apicache/blob/0d5686cc21fad353c6dddee646288c2fca3e4f50/src/apicache.js#L254
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Object.assign(headers, filterBlacklistedHeaders(cacheObject.headers || {}));
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// only embed apicache headers when not in production environment
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if (process.env.NODE_ENV !== "production") {
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Object.assign(headers, {
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"apicache-store": globalOptions.redisClient ? "redis" : "memory",
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"apicache-version": "1.6.2-modified",
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});
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}
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// unstringify buffers
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let data = cacheObject.data;
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if (data && data.type === "Buffer") {
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data =
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typeof data.data === "number" ? new Buffer.alloc(data.data) : new Buffer.from(data.data);
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}
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// test Etag against If-None-Match for 304
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let cachedEtag = cacheObject.headers.etag;
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let requestEtag = request.headers["if-none-match"];
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if (requestEtag && cachedEtag === requestEtag) {
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response.writeHead(304, headers);
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return response.end();
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}
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response.writeHead(cacheObject.status || 200, headers);
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return response.end(data, cacheObject.encoding);
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}
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function syncOptions() {
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for (let i in middlewareOptions) {
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Object.assign(middlewareOptions[i].options, globalOptions, middlewareOptions[i].localOptions);
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}
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}
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this.clear = function (target, isAutomatic) {
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let group = index.groups[target];
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let redis = globalOptions.redisClient;
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if (group) {
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debug("clearing group \"" + target + "\"");
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group.forEach(function (key) {
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debug("clearing cached entry for \"" + key + "\"");
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clearTimeout(timers[key]);
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delete timers[key];
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if (!globalOptions.redisClient) {
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memCache.delete(key);
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} else {
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try {
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redis.del(key);
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} catch (err) {
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console.log("[apicache] error in redis.del(\"" + key + "\")");
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}
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}
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index.all = index.all.filter(doesntMatch(key));
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});
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delete index.groups[target];
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} else if (target) {
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debug("clearing " + (isAutomatic ? "expired" : "cached") + " entry for \"" + target + "\"");
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clearTimeout(timers[target]);
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delete timers[target];
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// clear actual cached entry
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if (!redis) {
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memCache.delete(target);
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} else {
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try {
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redis.del(target);
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} catch (err) {
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console.log("[apicache] error in redis.del(\"" + target + "\")");
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}
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}
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// remove from global index
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index.all = index.all.filter(doesntMatch(target));
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// remove target from each group that it may exist in
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Object.keys(index.groups).forEach(function (groupName) {
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index.groups[groupName] = index.groups[groupName].filter(doesntMatch(target));
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// delete group if now empty
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if (!index.groups[groupName].length) {
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delete index.groups[groupName];
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}
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});
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} else {
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debug("clearing entire index");
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if (!redis) {
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memCache.clear();
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} else {
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// clear redis keys one by one from internal index to prevent clearing non-apicache entries
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index.all.forEach(function (key) {
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clearTimeout(timers[key]);
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delete timers[key];
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try {
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redis.del(key);
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} catch (err) {
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console.log("[apicache] error in redis.del(\"" + key + "\")");
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}
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});
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}
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this.resetIndex();
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}
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return this.getIndex();
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};
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/**
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* Converts a duration string to an integer number of milliseconds.
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* @param {string} duration - The string to convert.
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* @returns {number} The converted value in milliseconds, or the defaultDuration if it can't be parsed.
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*
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* Generated by Trelent
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*/
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function parseDuration(duration, defaultDuration) {
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if (typeof duration === "number") {
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return duration;
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}
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if (typeof duration === "string") {
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let split = duration.match(/^([\d\.,]+)\s?(\w+)$/);
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if (split.length === 3) {
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let len = parseFloat(split[1]);
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let unit = split[2].replace(/s$/i, "").toLowerCase();
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if (unit === "m") {
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unit = "ms";
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}
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return (len || 1) * (t[unit] || 0);
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}
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}
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return defaultDuration;
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}
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this.getDuration = function (duration) {
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return parseDuration(duration, globalOptions.defaultDuration);
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};
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/**
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* Return cache performance statistics (hit rate). Suitable for putting into a route:
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* <code>
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* app.get('/api/cache/performance', (req, res) => {
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* res.json(apicache.getPerformance())
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* })
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* </code>
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*/
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this.getPerformance = function () {
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return performanceArray.map(function (p) {
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return p.report();
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});
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};
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this.getIndex = function (group) {
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if (group) {
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return index.groups[group];
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} else {
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return index;
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}
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};
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this.middleware = function cache(strDuration, middlewareToggle, localOptions) {
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let duration = instance.getDuration(strDuration);
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let opt = {};
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middlewareOptions.push({
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options: opt,
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});
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let options = function (localOptions) {
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if (localOptions) {
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middlewareOptions.find(function (middleware) {
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return middleware.options === opt;
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}).localOptions = localOptions;
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}
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syncOptions();
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return opt;
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};
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options(localOptions);
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/**
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* A Function for non tracking performance
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*/
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function NOOPCachePerformance() {
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this.report = this.hit = this.miss = function () {}; // noop;
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}
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/**
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* A function for tracking and reporting hit rate. These statistics are returned by the getPerformance() call above.
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*/
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function CachePerformance() {
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/**
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* Tracks the hit rate for the last 100 requests.
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* If there have been fewer than 100 requests, the hit rate just considers the requests that have happened.
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*/
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this.hitsLast100 = new Uint8Array(100 / 4); // each hit is 2 bits
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/**
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* Tracks the hit rate for the last 1000 requests.
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* If there have been fewer than 1000 requests, the hit rate just considers the requests that have happened.
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*/
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this.hitsLast1000 = new Uint8Array(1000 / 4); // each hit is 2 bits
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/**
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* Tracks the hit rate for the last 10000 requests.
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* If there have been fewer than 10000 requests, the hit rate just considers the requests that have happened.
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*/
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this.hitsLast10000 = new Uint8Array(10000 / 4); // each hit is 2 bits
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/**
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* Tracks the hit rate for the last 100000 requests.
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* If there have been fewer than 100000 requests, the hit rate just considers the requests that have happened.
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*/
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this.hitsLast100000 = new Uint8Array(100000 / 4); // each hit is 2 bits
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/**
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* The number of calls that have passed through the middleware since the server started.
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*/
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this.callCount = 0;
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/**
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* The total number of hits since the server started
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*/
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this.hitCount = 0;
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/**
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* The key from the last cache hit. This is useful in identifying which route these statistics apply to.
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*/
|
|
this.lastCacheHit = null;
|
|
|
|
/**
|
|
* The key from the last cache miss. This is useful in identifying which route these statistics apply to.
|
|
*/
|
|
this.lastCacheMiss = null;
|
|
|
|
/**
|
|
* Return performance statistics
|
|
*/
|
|
this.report = function () {
|
|
return {
|
|
lastCacheHit: this.lastCacheHit,
|
|
lastCacheMiss: this.lastCacheMiss,
|
|
callCount: this.callCount,
|
|
hitCount: this.hitCount,
|
|
missCount: this.callCount - this.hitCount,
|
|
hitRate: this.callCount == 0 ? null : this.hitCount / this.callCount,
|
|
hitRateLast100: this.hitRate(this.hitsLast100),
|
|
hitRateLast1000: this.hitRate(this.hitsLast1000),
|
|
hitRateLast10000: this.hitRate(this.hitsLast10000),
|
|
hitRateLast100000: this.hitRate(this.hitsLast100000),
|
|
};
|
|
};
|
|
|
|
/**
|
|
* Computes a cache hit rate from an array of hits and misses.
|
|
* @param {Uint8Array} array An array representing hits and misses.
|
|
* @returns a number between 0 and 1, or null if the array has no hits or misses
|
|
*/
|
|
this.hitRate = function (array) {
|
|
let hits = 0;
|
|
let misses = 0;
|
|
for (let i = 0; i < array.length; i++) {
|
|
let n8 = array[i];
|
|
for (let j = 0; j < 4; j++) {
|
|
switch (n8 & 3) {
|
|
case 1:
|
|
hits++;
|
|
break;
|
|
case 2:
|
|
misses++;
|
|
break;
|
|
}
|
|
n8 >>= 2;
|
|
}
|
|
}
|
|
let total = hits + misses;
|
|
if (total == 0) {
|
|
return null;
|
|
}
|
|
return hits / total;
|
|
};
|
|
|
|
/**
|
|
* Record a hit or miss in the given array. It will be recorded at a position determined
|
|
* by the current value of the callCount variable.
|
|
* @param {Uint8Array} array An array representing hits and misses.
|
|
* @param {boolean} hit true for a hit, false for a miss
|
|
* Each element in the array is 8 bits, and encodes 4 hit/miss records.
|
|
* Each hit or miss is encoded as to bits as follows:
|
|
* 00 means no hit or miss has been recorded in these bits
|
|
* 01 encodes a hit
|
|
* 10 encodes a miss
|
|
*/
|
|
this.recordHitInArray = function (array, hit) {
|
|
let arrayIndex = ~~(this.callCount / 4) % array.length;
|
|
let bitOffset = (this.callCount % 4) * 2; // 2 bits per record, 4 records per uint8 array element
|
|
let clearMask = ~(3 << bitOffset);
|
|
let record = (hit ? 1 : 2) << bitOffset;
|
|
array[arrayIndex] = (array[arrayIndex] & clearMask) | record;
|
|
};
|
|
|
|
/**
|
|
* Records the hit or miss in the tracking arrays and increments the call count.
|
|
* @param {boolean} hit true records a hit, false records a miss
|
|
*/
|
|
this.recordHit = function (hit) {
|
|
this.recordHitInArray(this.hitsLast100, hit);
|
|
this.recordHitInArray(this.hitsLast1000, hit);
|
|
this.recordHitInArray(this.hitsLast10000, hit);
|
|
this.recordHitInArray(this.hitsLast100000, hit);
|
|
if (hit) {
|
|
this.hitCount++;
|
|
}
|
|
this.callCount++;
|
|
};
|
|
|
|
/**
|
|
* Records a hit event, setting lastCacheMiss to the given key
|
|
* @param {string} key The key that had the cache hit
|
|
*/
|
|
this.hit = function (key) {
|
|
this.recordHit(true);
|
|
this.lastCacheHit = key;
|
|
};
|
|
|
|
/**
|
|
* Records a miss event, setting lastCacheMiss to the given key
|
|
* @param {string} key The key that had the cache miss
|
|
*/
|
|
this.miss = function (key) {
|
|
this.recordHit(false);
|
|
this.lastCacheMiss = key;
|
|
};
|
|
}
|
|
|
|
let perf = globalOptions.trackPerformance ? new CachePerformance() : new NOOPCachePerformance();
|
|
|
|
performanceArray.push(perf);
|
|
|
|
let cache = function (req, res, next) {
|
|
function bypass() {
|
|
debug("bypass detected, skipping cache.");
|
|
return next();
|
|
}
|
|
|
|
// initial bypass chances
|
|
if (!opt.enabled) {
|
|
return bypass();
|
|
}
|
|
if (
|
|
req.headers["x-apicache-bypass"] ||
|
|
req.headers["x-apicache-force-fetch"] ||
|
|
(opt.respectCacheControl && req.headers["cache-control"] == "no-cache")
|
|
) {
|
|
return bypass();
|
|
}
|
|
|
|
// REMOVED IN 0.11.1 TO CORRECT MIDDLEWARE TOGGLE EXECUTE ORDER
|
|
// if (typeof middlewareToggle === 'function') {
|
|
// if (!middlewareToggle(req, res)) return bypass()
|
|
// } else if (middlewareToggle !== undefined && !middlewareToggle) {
|
|
// return bypass()
|
|
// }
|
|
|
|
// embed timer
|
|
req.apicacheTimer = new Date();
|
|
|
|
// In Express 4.x the url is ambigious based on where a router is mounted. originalUrl will give the full Url
|
|
let key = req.originalUrl || req.url;
|
|
|
|
// Remove querystring from key if jsonp option is enabled
|
|
if (opt.jsonp) {
|
|
key = url.parse(key).pathname;
|
|
}
|
|
|
|
// add appendKey (either custom function or response path)
|
|
if (typeof opt.appendKey === "function") {
|
|
key += "$$appendKey=" + opt.appendKey(req, res);
|
|
} else if (opt.appendKey.length > 0) {
|
|
let appendKey = req;
|
|
|
|
for (let i = 0; i < opt.appendKey.length; i++) {
|
|
appendKey = appendKey[opt.appendKey[i]];
|
|
}
|
|
key += "$$appendKey=" + appendKey;
|
|
}
|
|
|
|
// attempt cache hit
|
|
let redis = opt.redisClient;
|
|
let cached = !redis ? memCache.getValue(key) : null;
|
|
|
|
// send if cache hit from memory-cache
|
|
if (cached) {
|
|
let elapsed = new Date() - req.apicacheTimer;
|
|
debug("sending cached (memory-cache) version of", key, logDuration(elapsed));
|
|
|
|
perf.hit(key);
|
|
return sendCachedResponse(req, res, cached, middlewareToggle, next, duration);
|
|
}
|
|
|
|
// send if cache hit from redis
|
|
if (redis && redis.connected) {
|
|
try {
|
|
redis.hgetall(key, function (err, obj) {
|
|
if (!err && obj && obj.response) {
|
|
let elapsed = new Date() - req.apicacheTimer;
|
|
debug("sending cached (redis) version of", key, logDuration(elapsed));
|
|
|
|
perf.hit(key);
|
|
return sendCachedResponse(
|
|
req,
|
|
res,
|
|
JSON.parse(obj.response),
|
|
middlewareToggle,
|
|
next,
|
|
duration
|
|
);
|
|
} else {
|
|
perf.miss(key);
|
|
return makeResponseCacheable(
|
|
req,
|
|
res,
|
|
next,
|
|
key,
|
|
duration,
|
|
strDuration,
|
|
middlewareToggle
|
|
);
|
|
}
|
|
});
|
|
} catch (err) {
|
|
// bypass redis on error
|
|
perf.miss(key);
|
|
return makeResponseCacheable(req, res, next, key, duration, strDuration, middlewareToggle);
|
|
}
|
|
} else {
|
|
perf.miss(key);
|
|
return makeResponseCacheable(req, res, next, key, duration, strDuration, middlewareToggle);
|
|
}
|
|
};
|
|
|
|
cache.options = options;
|
|
|
|
return cache;
|
|
};
|
|
|
|
this.options = function (options) {
|
|
if (options) {
|
|
Object.assign(globalOptions, options);
|
|
syncOptions();
|
|
|
|
if ("defaultDuration" in options) {
|
|
// Convert the default duration to a number in milliseconds (if needed)
|
|
globalOptions.defaultDuration = parseDuration(globalOptions.defaultDuration, 3600000);
|
|
}
|
|
|
|
if (globalOptions.trackPerformance) {
|
|
debug("WARNING: using trackPerformance flag can cause high memory usage!");
|
|
}
|
|
|
|
return this;
|
|
} else {
|
|
return globalOptions;
|
|
}
|
|
};
|
|
|
|
this.resetIndex = function () {
|
|
index = {
|
|
all: [],
|
|
groups: {},
|
|
};
|
|
};
|
|
|
|
this.newInstance = function (config) {
|
|
let instance = new ApiCache();
|
|
|
|
if (config) {
|
|
instance.options(config);
|
|
}
|
|
|
|
return instance;
|
|
};
|
|
|
|
this.clone = function () {
|
|
return this.newInstance(this.options());
|
|
};
|
|
|
|
// initialize index
|
|
this.resetIndex();
|
|
}
|
|
|
|
module.exports = new ApiCache();
|