fix: scope live revisions to worker generations (#383)

frontend/context-poller.js

@@ -1,3 +1,15 @@
+function buildLiveRevisionQuery(revisions = {}) {
+  const params = new URLSearchParams();
+  const tokenPattern = /^[0-9a-f]{16}\.[0-9]{1,20}$/;
+  ['context', 'events', 'notifications'].forEach((section) => {
+    const revision = revisions[section];
+    if (typeof revision === 'string' && tokenPattern.test(revision)) {
+      params.set(section + '_revision', revision);
+    }
+  });
+  return params.toString();
+}
+
 function createContextPoller({
   fetchContext,
   onSnapshot,
@@ -123,6 +135,8 @@ function createContextPoller({
   };
 }
 
+createContextPoller.buildRevisionQuery = buildLiveRevisionQuery;
+
 if (typeof module !== 'undefined' && module.exports) {
   module.exports = createContextPoller;
 }

frontend/dashboard.js

@@ -324,11 +324,7 @@
   setClock(); setInterval(setClock, 1000);
 
   async function fetchLiveSnapshot(revisions = {}, { signal } = {}) {
-    const params = new URLSearchParams();
-    Object.entries(revisions).forEach(([section, revision]) => {
-      if (Number.isInteger(revision) && revision >= 0) params.set(section + '_revision', revision);
-    });
-    const query = params.toString();
+    const query = createContextPoller.buildRevisionQuery(revisions);
     const res = await fetch('api/v1/live' + (query ? '?' + query : ''), {
       headers: { Accept: 'application/json' },
       signal,