mirror of https://github.com/go-gitea/gitea.git
* Move EventSource to SharedWorker (#12095) Backport #12095 Move EventSource to use a SharedWorker. This prevents issues with HTTP/1.1 open browser connections from preventing gitea from opening multiple tabs. Also allow setting EVENT_SOURCE_UPDATE_TIME to disable EventSource updating Fix #11978 Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: techknowlogick <techknowlogick@gitea.io> * Bugfix for shared event source For some reason our eslint configuration is not working correctly and a bug has become apparent when trying to backport this to 1.12. Signed-off-by: Andrew Thornton <art27@cantab.net> * Re-fix #12095 again Unfortunately some of the suggested changes to #12095 introduced bugs which due to caching behaviour of sharedworkers were not caught on simple tests. These are as follows: * Changing from simple for loop to use includes here: ```js register(port) { if (!this.clients.includes(port)) return; this.clients.push(port); port.postMessage({ type: 'status', message: `registered to ${this.url}`, }); } ``` The additional `!` prevents any clients from being added and should read: ```js if (this.clients.includes(port)) return; ``` * Dropping the use of jQuery `$(...)` selection and using DOM `querySelector` here: ```js async function receiveUpdateCount(event) { try { const data = JSON.parse(event.data); const notificationCount = document.querySelector('.notification_count'); if (data.Count > 0) { notificationCount.classList.remove('hidden'); } else { notificationCount.classList.add('hidden'); } notificationCount.text() = `${data.Count}`; await updateNotificationTable(); } catch (error) { console.error(error, event); } } ``` Requires that `notificationCount.text()` be changed to use `textContent` instead. Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: techknowlogick <techknowlogick@gitea.io>pull/12147/head^2
zeripath
5 years ago
committed by
GitHub
parent
8f64017058
commit
e46dbec294
@ -0,0 +1,135 @@
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self.name = 'eventsource.sharedworker.js';
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const sourcesByUrl = {};
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const sourcesByPort = {};
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class Source {
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constructor(url) {
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this.url = url;
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this.eventSource = new EventSource(url);
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this.listening = {};
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this.clients = [];
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this.listen('open');
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this.listen('logout');
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this.listen('notification-count');
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this.listen('error');
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}
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register(port) {
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if (this.clients.includes(port)) return;
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this.clients.push(port);
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port.postMessage({
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type: 'status',
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message: `registered to ${this.url}`,
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});
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}
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deregister(port) {
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const portIdx = this.clients.indexOf(port);
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if (portIdx < 0) {
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return this.clients.length;
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}
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this.clients.splice(portIdx, 1);
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return this.clients.length;
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}
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close() {
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if (!this.eventSource) return;
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this.eventSource.close();
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this.eventSource = null;
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}
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listen(eventType) {
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if (this.listening[eventType]) return;
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this.listening[eventType] = true;
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const self = this;
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this.eventSource.addEventListener(eventType, (event) => {
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self.notifyClients({
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type: eventType,
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data: event.data
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});
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});
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}
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notifyClients(event) {
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for (const client of this.clients) {
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client.postMessage(event);
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}
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}
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status(port) {
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port.postMessage({
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type: 'status',
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message: `url: ${this.url} readyState: ${this.eventSource.readyState}`,
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});
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}
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}
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self.onconnect = (e) => {
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for (const port of e.ports) {
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port.addEventListener('message', (event) => {
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if (event.data.type === 'start') {
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const url = event.data.url;
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if (sourcesByUrl[url]) {
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// we have a Source registered to this url
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const source = sourcesByUrl[url];
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source.register(port);
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sourcesByPort[port] = source;
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return;
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}
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let source = sourcesByPort[port];
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if (source) {
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if (source.eventSource && source.url === url) return;
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// How this has happened I don't understand...
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// deregister from that source
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const count = source.deregister(port);
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// Clean-up
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if (count === 0) {
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source.close();
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sourcesByUrl[source.url] = null;
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}
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}
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// Create a new Source
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source = new Source(url);
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source.register(port);
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sourcesByUrl[url] = source;
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sourcesByPort[port] = source;
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} else if (event.data.type === 'listen') {
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const source = sourcesByPort[port];
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source.listen(event.data.eventType);
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} else if (event.data.type === 'close') {
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const source = sourcesByPort[port];
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if (!source) return;
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const count = source.deregister(port);
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if (count === 0) {
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source.close();
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sourcesByUrl[source.url] = null;
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sourcesByPort[port] = null;
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}
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} else if (event.data.type === 'status') {
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const source = sourcesByPort[port];
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if (!source) {
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port.postMessage({
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type: 'status',
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message: 'not connected',
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});
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return;
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}
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source.status(port);
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} else {
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// just send it back
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port.postMessage({
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type: 'error',
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message: `received but don't know how to handle: ${event.data}`,
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});
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}
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});
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port.start();
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}
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};
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