Update checker

web/src/app/VersionChecker.js

@@ -0,0 +1,93 @@
+/**
+ * VersionChecker polls the /v1/version endpoint to detect server restarts
+ * or configuration changes, prompting users to refresh the page.
+ */
+
+const CHECK_INTERVAL = 5 * 60 * 1000; // 5 minutes
+
+class VersionChecker {
+  constructor() {
+    this.initialConfigHash = null;
+    this.listener = null;
+    this.intervalId = null;
+  }
+
+  /**
+   * Starts the version checker worker. It stores the initial config hash
+   * from the config.js and polls the server every 5 minutes.
+   */
+  startWorker() {
+    // Store initial config hash from the config loaded at page load
+    this.initialConfigHash = window.config?.config_hash || null;
+
+    if (!this.initialConfigHash) {
+      console.log("[VersionChecker] No initial config_hash found, version checking disabled");
+      return;
+    }
+
+    console.log("[VersionChecker] Starting version checker with initial hash:", this.initialConfigHash);
+
+    // Start polling
+    this.intervalId = setInterval(() => this.checkVersion(), CHECK_INTERVAL);
+  }
+
+  /**
+   * Stops the version checker worker.
+   */
+  stopWorker() {
+    if (this.intervalId) {
+      clearInterval(this.intervalId);
+      this.intervalId = null;
+    }
+    console.log("[VersionChecker] Stopped version checker");
+  }
+
+  /**
+   * Registers a listener that will be called when a version change is detected.
+   * @param {function} listener - Callback function that receives no arguments
+   */
+  registerListener(listener) {
+    this.listener = listener;
+  }
+
+  /**
+   * Resets the listener.
+   */
+  resetListener() {
+    this.listener = null;
+  }
+
+  /**
+   * Fetches the current version from the server and compares it with the initial config hash.
+   */
+  async checkVersion() {
+    if (!this.initialConfigHash) {
+      return;
+    }
+
+    try {
+      const response = await fetch(`${window.config?.base_url || ""}/v1/version`);
+      if (!response.ok) {
+        console.log("[VersionChecker] Failed to fetch version:", response.status);
+        return;
+      }
+
+      const data = await response.json();
+      const currentHash = data.config_hash;
+
+      console.log("[VersionChecker] Checked version, initial:", this.initialConfigHash, "current:", currentHash);
+
+      if (currentHash && currentHash !== this.initialConfigHash) {
+        console.log("[VersionChecker] Config hash changed, notifying listener");
+        if (this.listener) {
+          this.listener();
+        }
+      }
+    } catch (error) {
+      console.log("[VersionChecker] Error checking version:", error);
+    }
+  }
+}
+
+const versionChecker = new VersionChecker();
+export default versionChecker;