De-duplicate link fetching to one request at once
This commit is contained in:
Pavel Djundik
parent
af11b864ce
commit
4e2523060b
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@ -8,7 +8,7 @@ const Helper = require("../../helper");
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const cleanIrcMessage = require("../../../client/js/libs/handlebars/ircmessageparser/cleanIrcMessage");
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const findLinks = require("../../../client/js/libs/handlebars/ircmessageparser/findLinks");
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const storage = require("../storage");
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const currentFetchPromises = new Map();
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const mediaTypeRegex = /^(audio|video)\/.+/;
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// Fix ECDH curve client compatibility in Node v8/v9
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@ -63,19 +63,13 @@ module.exports = function(client, chan, msg) {
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fetch(url, {
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accept: "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
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language: client.language,
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}, function(res, err) {
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if (err) {
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}).then((res) => {
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parse(msg, preview, res, client);
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}).catch((err) => {
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preview.type = "error";
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preview.error = "message";
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preview.message = err.message;
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handlePreview(client, msg, preview, res);
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}
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if (res === null) {
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return;
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}
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parse(msg, preview, res, client);
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handlePreview(client, msg, preview, null);
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});
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return cleanLinks;
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@ -111,7 +105,7 @@ function parseHtml(preview, res, client) {
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// Verify that thumbnail pic exists and is under allowed size
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if (preview.thumb.length) {
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fetch(preview.thumb, {language: client.language}, (resThumb) => {
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fetch(preview.thumb, {language: client.language}).then((resThumb) => {
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if (resThumb === null
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|| !(/^image\/.+/.test(resThumb.type))
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|| resThumb.size > (Helper.config.prefetchMaxImageSize * 1024)) {
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@ -119,6 +113,9 @@ function parseHtml(preview, res, client) {
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}
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resolve(resThumb);
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}).catch(() => {
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preview.thumb = "";
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resolve(null);
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});
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} else {
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resolve(res);
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@ -158,7 +155,7 @@ function parseHtmlMedia($, preview, res, client) {
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"video/webm,video/ogg,video/*;q=0.9,application/ogg;q=0.7,audio/*;q=0.6,*/*;q=0.5" :
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"audio/webm, audio/ogg, audio/wav, audio/*;q=0.9, application/ogg;q=0.7, video/*;q=0.6; */*;q=0.5",
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language: client.language,
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}, (resMedia) => {
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}).then((resMedia) => {
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if (resMedia === null || !mediaTypeRegex.test(resMedia.type)) {
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return reject();
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}
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@ -168,7 +165,7 @@ function parseHtmlMedia($, preview, res, client) {
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preview.mediaType = resMedia.type;
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resolve(resMedia);
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});
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}).catch(reject);
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return false;
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}
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@ -313,7 +310,16 @@ function getRequestHeaders(headers) {
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return formattedHeaders;
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}
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function fetch(uri, headers, cb) {
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function fetch(uri, headers) {
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// Stringify the object otherwise the objects won't compute to the same value
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const cacheKey = JSON.stringify([uri, headers]);
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let promise = currentFetchPromises.get(cacheKey);
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if (promise) {
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return promise;
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}
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promise = new Promise((resolve, reject) => {
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let req;
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try {
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@ -324,7 +330,7 @@ function fetch(uri, headers, cb) {
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headers: getRequestHeaders(headers),
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});
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} catch (e) {
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return cb(null, e);
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return reject(e);
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}
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const buffers = [];
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@ -350,7 +356,7 @@ function fetch(uri, headers, cb) {
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limit = 1024 * 50;
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}
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})
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.on("error", (e) => cb(null, e))
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.on("error", (e) => reject(e))
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.on("data", (data) => {
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length += data.length;
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buffers.push(data);
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@ -361,7 +367,7 @@ function fetch(uri, headers, cb) {
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})
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.on("end", () => {
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if (req.response.statusCode < 200 || req.response.statusCode > 299) {
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return cb(null, new Error(`HTTP ${req.response.statusCode}`));
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return reject(new Error(`HTTP ${req.response.statusCode}`));
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}
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let type = "";
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@ -376,8 +382,17 @@ function fetch(uri, headers, cb) {
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}
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const data = Buffer.concat(buffers, length);
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cb({data, type, size});
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resolve({data, type, size});
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});
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});
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const removeCache = () => currentFetchPromises.delete(cacheKey);
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promise.then(removeCache).catch(removeCache);
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currentFetchPromises.set(cacheKey, promise);
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return promise;
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}
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function normalizeURL(link, baseLink, disallowHttp = false) {
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@ -422,4 +422,85 @@ describe("Link plugin", function() {
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expect(message.previews).to.be.empty;
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});
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it("should fetch same link only once at the same time", function(done) {
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const message = this.irc.createMessage({
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text: "http://localhost:9002/basic-og-once",
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});
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let requests = 0;
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let responses = 0;
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this.irc.language = "very nice language";
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link(this.irc, this.network.channels[0], message);
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link(this.irc, this.network.channels[0], message);
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process.nextTick(() => link(this.irc, this.network.channels[0], message));
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app.get("/basic-og-once", function(req, res) {
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requests++;
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expect(req.header("accept-language")).to.equal("very nice language");
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// delay the request so it doesn't resolve immediately
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setTimeout(() => {
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res.send("<title>test prefetch</title>");
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}, 100);
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});
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const cb = (data) => {
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responses++;
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expect(data.preview.head, "test prefetch");
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if (responses === 3) {
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this.irc.removeListener("msg:preview", cb);
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expect(requests).to.equal(1);
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done();
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}
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};
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this.irc.on("msg:preview", cb);
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});
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it("should fetch same link with different languages multiple times", function(done) {
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const message = this.irc.createMessage({
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text: "http://localhost:9002/basic-og-once-lang",
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});
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const requests = [];
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let responses = 0;
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this.irc.language = "first language";
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link(this.irc, this.network.channels[0], message);
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this.irc.language = "second language";
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link(this.irc, this.network.channels[0], message);
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app.get("/basic-og-once-lang", function(req, res) {
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requests.push(req.header("accept-language"));
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// delay the request so it doesn't resolve immediately
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setTimeout(() => {
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res.send("<title>test prefetch</title>");
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}, 100);
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});
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const cb = (data) => {
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responses++;
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expect(data.preview.head, "test prefetch");
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if (responses === 2) {
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this.irc.removeListener("msg:preview", cb);
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expect(requests).to.deep.equal([
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"first language",
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"second language",
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]);
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done();
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}
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};
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this.irc.on("msg:preview", cb);
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});
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});
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