card #223: update quc/src/runs.js

quc/src/runs.js

@@ -0,0 +1,50 @@
+// Run model: queued -> running -> ended(finished|safeworded|unlocked), an append-only event log per run, one active run per visitor.
+// `store` is anything with async get(key) / put(key, string) / delete(key): a Workers KV namespace, or a Map wrapper in tests.
+// Keys: run:<id> (record), events:<id> (array), active:<visitor> (id of that visitor's queued/running run).
+// shortcut: KV has no compare-and-set, so two simultaneous starts by one visitor can both pass the check; move to a Durable Object when that matters.
+import { validate } from "./worker.js";
+
+export const KINDS = ["diff", "commit", "commentary", "unlock"];
+export const OUTCOMES = ["finished", "safeworded", "unlocked"];
+const NEXT = { queued: ["running", "ended"], running: ["ended"] };
+
+const fail = (code, message, extra) => Object.assign(new Error(message), { code }, extra);
+const load = async (s, k, empty = null) => JSON.parse((await s.get(k)) ?? "null") ?? empty;
+const save = (s, k, v) => s.put(k, JSON.stringify(v));
+
+export const getRun = (store, id) => load(store, `run:${id}`);
+export const getEvents = (store, id) => load(store, `events:${id}`, []);
+
+export async function createRun(store, { repo, task, visitor }) {
+  if (typeof visitor !== "string" || !visitor) throw fail("visitor", "visitor token required");
+  const errors = validate(repo, task);
+  if (Object.keys(errors).length) throw fail("invalid", "invalid run", { errors });
+  if (await store.get(`active:${visitor}`)) throw fail("active", "visitor already has an active run");
+  const run = { id: crypto.randomUUID().slice(0, 8), repo, task, status: "queued", visitor, createdAt: new Date().toISOString() };
+  await save(store, `run:${run.id}`, run);
+  await store.put(`active:${visitor}`, run.id);
+  return run;
+}
+
+export async function setStatus(store, id, status, outcome) {
+  const run = await getRun(store, id);
+  if (!run) throw fail("not_found", "no such run");
+  if (!NEXT[run.status]?.includes(status)) throw fail("transition", `cannot go ${run.status} -> ${status}`);
+  if (status === "ended" && !OUTCOMES.includes(outcome)) throw fail("outcome", "ended needs an outcome: " + OUTCOMES.join("|"));
+  const at = new Date().toISOString();
+  run.status = status;
+  if (status === "running") run.startedAt = at;
+  else Object.assign(run, { endedAt: at, outcome });
+  await save(store, `run:${id}`, run);
+  if (status === "ended") await store.delete(`active:${run.visitor}`);
+  return run;
+}
+
+export async function addEvent(store, id, kind, data) {
+  if (!KINDS.includes(kind)) throw fail("kind", "event kind must be " + KINDS.join("|"));
+  if (!(await getRun(store, id))) throw fail("not_found", "no such run");
+  const events = await getEvents(store, id);
+  const event = { seq: events.length + 1, at: new Date().toISOString(), kind, data };
+  await save(store, `events:${id}`, [...events, event]);
+  return event;
+}