vscode: Show notification when upgrade is available

And link to the release notes.

Author: nhooyr

ci/dev/vscode.patch

@@ -769,10 +769,10 @@ index 096b9e23493539c9937940a56e555d95bbae38d9..ef37e614004f550f7b64eacd362f6894
  	remove(key: string, scope: StorageScope): void {
 diff --git a/src/vs/server/browser/client.ts b/src/vs/server/browser/client.ts
 new file mode 100644
-index 0000000000000000000000000000000000000000..3c0703b7174ad792a4b42841e96ee93765d71601
+index 0000000000000000000000000000000000000000..667ca961830feaf6fc5e5bb7ef2df3b8be97b176
 --- /dev/null
 +++ b/src/vs/server/browser/client.ts
-@@ -0,0 +1,189 @@
+@@ -0,0 +1,237 @@
 +import { Emitter } from 'vs/base/common/event';
 +import { URI } from 'vs/base/common/uri';
 +import { localize } from 'vs/nls';
@@ -791,6 +791,7 @@ index 0000000000000000000000000000000000000000..3c0703b7174ad792a4b42841e96ee937
 +import { IRemoteAgentService } from 'vs/workbench/services/remote/common/remoteAgentService';
 +import { Options } from 'vs/server/ipc.d';
 +import { IStorageService, StorageScope } from 'vs/platform/storage/common/storage';
++import { ILogService } from 'vs/platform/log/common/log';
 +
 +class TelemetryService extends TelemetryChannelClient {
 +	public constructor(
@@ -922,8 +923,55 @@ index 0000000000000000000000000000000000000000..3c0703b7174ad792a4b42841e96ee937
 +		});
 +	}
 +
++	const logService = (services.get(ILogService) as ILogService);
++	const storageService = (services.get(IStorageService) as IStorageService)
++	const getUpdate = async (): Promise<void> => {
++		logService.debug("Checking for update...");
++
++		const response = await fetch("update/check", {
++			headers: { "Accept": "application/json" },
++		});
++		if (!response.ok) {
++			throw new Error(response.statusText);
++		}
++		const json = await response.json();
++		if (json.error) {
++			throw new Error(json.error);
++		}
++		if (json.isLatest) {
++			return;
++		}
++
++		const lastNoti = storageService.getNumber("csLastUpdateNotification", StorageScope.GLOBAL);
++		if (lastNoti) {
++			// Only remind them again after two days.
++			const timeout = 1000*60*24*2
++			const threshold = lastNoti + timeout;
++			if (Date.now() < threshold) {
++				return;
++			}
++		}
++
++		storageService.store("csLastUpdateNotification", Date.now(), StorageScope.GLOBAL);
++		(services.get(INotificationService) as INotificationService).notify({
++			severity: Severity.Info,
++			message: `[code-server v${json.latest}](https://github.com/cdr/code-server/releases/tag/v${json.latest}) has been released!`,
++		});
++	};
++
++	const updateLoop = (): void => {
++		getUpdate().catch((error) => {
++			logService.debug(`failed to check for update: ${error}`);
++		}).finally(() => {
++			// Check again every 6 hours.
++			setTimeout(updateLoop, 1000*60*6);
++		});
++	};
++
++	updateLoop();
++
 +	// This will be used to set the background color while VS Code loads.
-+	const theme = (services.get(IStorageService) as IStorageService).get("colorThemeData", StorageScope.GLOBAL);
++	const theme = storageService.get("colorThemeData", StorageScope.GLOBAL);
 +	if (theme) {
 +		localStorage.setItem("colorThemeData", theme);
 +	}

src/node/routes/update.ts

@@ -7,7 +7,7 @@ export const router = Router()
 
 const provider = new UpdateProvider()
 
-router.get("/", ensureAuthenticated, async (req, res) => {
+router.get("/check", ensureAuthenticated, async (req, res) => {
   const update = await provider.getUpdate(req.query.force === "true")
   res.json({
     checked: update.checked,