Load limiting safeguards

dashboard/src/progress.md

@@ -3,24 +3,26 @@ title: Progress
 ---
 
 ```js
-import {API, POLL} from "./components/config.js";
+import {POLL_HEAVY, apiFetch, pollDelay, sleep} from "./components/config.js";
 ```
 
 ```js
 const progState = (async function*() {
+  let failures = 0;
   while (true) {
     let data = [], tokenEvents = [], ok = false;
     try {
       const [r1, r2] = await Promise.all([
-        fetch(`${API}/progress/?limit=500`),
-        fetch(`${API}/token-events/?limit=1000`),
+        apiFetch("/progress/?limit=500"),
+        apiFetch("/token-events/?limit=1000"),
       ]);
       ok = r1.ok;
       data = ok ? await r1.json() : [];
       tokenEvents = r2.ok ? await r2.json() : [];
     } catch {}
+    failures = ok ? 0 : failures + 1;
     yield {data, tokenEvents, ok, ts: new Date()};
-    await new Promise(res => setTimeout(res, POLL));
+    await sleep(pollDelay({ok, base: POLL_HEAVY, failures}));
   }
 })();
 ```