fix(kanban): recover from quota exhaustion

req: sync/015

examples/kanban/static/command-log.js

@@ -67,6 +67,10 @@ function stableSession() {
 async function appendReorder(database, wire) {
   const transaction = database.transaction([COMMANDS, META], "readwrite");
   const done = completed(transaction);
+  const completion = done.then(
+    () => null,
+    (error) => error,
+  );
   const meta = transaction.objectStore(META);
   const commands = transaction.objectStore(COMMANDS);
   const actorRequest = result(meta.get("actor"));
@@ -85,14 +89,18 @@ async function appendReorder(database, wire) {
     eventKind: String(wire[1] || "click"),
     key: wire[4] ? String(wire[4]) : null,
   };
-  meta.put(actor, "actor");
-  meta.put(causal, "causal");
-  const append = result(commands.add(command));
-  const counted = result(commands.count());
-  const completion = done.then(
-    () => null,
-    (error) => error,
-  );
+  let append;
+  let counted;
+  try {
+    meta.put(actor, "actor");
+    meta.put(causal, "causal");
+    append = result(commands.add(command));
+    counted = result(commands.count());
+  } catch (error) {
+    transaction.abort();
+    await completion;
+    throw error;
+  }
   try {
     const [, count] = await Promise.all([append, counted]);
     const transactionError = await completion;