Add real-time push: open tabs update the instant an admin edit lands

api/src/index.ts

@@ -2,9 +2,51 @@ export interface Env {
     ASSETS: Fetcher;
     DB: D1Database;
     OVERLAY_CACHE: KVNamespace;
+    HUB: DurableObjectNamespace;
     ADMIN_TOKEN: string;
 }
 
+// Single global room every browser tab connects to - broadcasts "something changed, refetch" to
+// every open tab the moment an admin write succeeds, instead of tabs only picking it up on their
+// next natural fetch. Uses the Hibernatable WebSockets API (acceptWebSocket/getWebSockets) so the
+// object doesn't have to stay pinned in memory (and billed) between messages - it wakes on a new
+// connection, a client event, or an incoming /broadcast call, and can go back to sleep otherwise.
+export class OverlayHub {
+    constructor(private state: DurableObjectState, private env: Env) {}
+
+    async fetch(request: Request): Promise<Response> {
+        const url = new URL(request.url);
+
+        if (url.pathname === "/broadcast") {
+            const body = await request.text();
+            for (const ws of this.state.getWebSockets()) {
+                try { ws.send(body); } catch { /* dead socket, ignore */ }
+            }
+            return new Response("ok");
+        }
+
+        if (request.headers.get("Upgrade") !== "websocket") {
+            return new Response("expected websocket", { status: 426 });
+        }
+
+        const pair = new WebSocketPair();
+        const [client, server] = Object.values(pair);
+        this.state.acceptWebSocket(server);
+        return new Response(null, { status: 101, webSocket: client });
+    }
+
+    async webSocketMessage() { /* clients never need to send anything, ignore */ }
+
+    async webSocketClose(ws: WebSocket) {
+        try { ws.close(); } catch { /* already closing */ }
+    }
+}
+
+async function broadcast(env: Env, message: unknown) {
+    const stub = env.HUB.get(env.HUB.idFromName("global"));
+    await stub.fetch("https://internal/broadcast", { method: "POST", body: JSON.stringify(message) });
+}
+
 interface Command {
     cmd: string;
     desc: string;
@@ -136,6 +178,13 @@ async function handle(request: Request, env: Env): Promise<Response> {
         return new Response(null, { headers: CORS_HEADERS });
     }
 
+    // Live-update channel - the site connects here once on load; every successful overlay write
+    // broadcasts through it so an already-open tab updates without the visitor doing anything.
+    if (url.pathname === "/ws") {
+        const stub = env.HUB.get(env.HUB.idFromName("global"));
+        return stub.fetch(request);
+    }
+
     // The site's actual data file - computed fresh on every request by merging the git-tracked base
     // (plugins-base.json, written by generate-site.mjs at build time) with the live overlay, so any
     // change from the admin plugin is visible immediately, with no rebuild. Draft-only plugins (no
@@ -249,12 +298,14 @@ async function handle(request: Request, env: Env): Promise<Response> {
             ).run();
 
             await env.OVERLAY_CACHE.delete(CACHE_KEY);
+            await broadcast(env, { type: "overlay-updated", id });
             return json({ ok: true });
         }
 
         if (request.method === "DELETE") {
             await env.DB.prepare("DELETE FROM overlay WHERE id = ?1").bind(id).run();
             await env.OVERLAY_CACHE.delete(CACHE_KEY);
+            await broadcast(env, { type: "overlay-updated", id });
             return json({ ok: true });
         }
     }

api/wrangler.toml

@@ -15,3 +15,11 @@ database_id = "639fef3c-6583-4128-adbd-b5f5f4761483"
 [[kv_namespaces]]
 binding = "OVERLAY_CACHE"
 id = "e56d183bdcd64f5facade1c3fe04eb08"
+
+[[durable_objects.bindings]]
+name = "HUB"
+class_name = "OverlayHub"
+
+[[migrations]]
+tag = "v1"
+new_sqlite_classes = ["OverlayHub"]

site/index.html

@@ -678,22 +678,64 @@
     }
   });
 
-  /* ---------- Boot ---------- */
+  /* ---------- Boot + live updates ---------- */
 
-  fetch("https://rp.jarviscli.dev/plugins-data.json")
-    .then(function (r) { return r.json(); })
-    .then(function (data) {
-      state.plugins = data;
-      renderStats();
-      renderChips();
-      render();
-      routeFromLocation();
-    })
-    .catch(function () {
-      count.textContent = "";
-      empty.hidden = false;
-      empty.textContent = "Couldn't load the plugin list - try refreshing.";
+  function reloadPlugins(isInitial) {
+    return fetch("https://rp.jarviscli.dev/plugins-data.json", { cache: "no-store" })
+      .then(function (r) { return r.json(); })
+      .then(function (data) {
+        state.plugins = data;
+        renderStats();
+        renderChips();
+        render();
+
+        var match = location.pathname.match(/^\/([\w-]+)\/?$/);
+        if (isInitial) {
+          routeFromLocation();
+        } else if (match && match[1]) {
+          // Re-render the open detail page too, in case what changed is the plugin being viewed
+          // right now (e.g. it just got marked broken).
+          showDetail(match[1]);
+          showToast("Updated");
+        } else {
+          showToast("Updated");
+        }
+      })
+      .catch(function () {
+        if (!isInitial) return;
+        count.textContent = "";
+        empty.hidden = false;
+        empty.textContent = "Couldn't load the plugin list - try refreshing.";
+      });
+  }
+
+  /**
+   * One shared WebSocket room (api/src/index.ts's OverlayHub Durable Object) that every open tab
+   * connects to - any successful admin write broadcasts through it, so a change from the admin
+   * plugin shows up here without needing a manual refresh. Reconnects with backoff if it drops
+   * (Cloudflare recycling the connection, a network blip, etc) rather than just giving up.
+   */
+  var liveRetryDelay = 2000;
+  function connectLive() {
+    var proto = location.protocol === "https:" ? "wss:" : "ws:";
+    var ws;
+    try {
+      ws = new WebSocket(proto + "//" + location.host + "/ws");
+    } catch (e) {
+      return;
+    }
+
+    ws.addEventListener("open", function () { liveRetryDelay = 2000; });
+    ws.addEventListener("message", function () { reloadPlugins(false); });
+    ws.addEventListener("close", function () {
+      setTimeout(connectLive, liveRetryDelay);
+      liveRetryDelay = Math.min(liveRetryDelay * 1.5, 30000);
     });
+    ws.addEventListener("error", function () { ws.close(); });
+  }
+
+  reloadPlugins(true);
+  connectLive();
 })();
 </script>
 </body>