fix(studio): enforce optimistic file concurrency (#2156)

* fix(studio): enforce optimistic file concurrency * fix(studio): harden conditional file writes * fix(studio): honor explicit file preconditions * test(producer): allow zero-ms encode timing
2026-09-10 22:20:14 +00:00 · 2026-07-15 18:07:04 -04:00
parent 35e623b4f3
commit 2417293dab
34 changed files with 838 additions and 72 deletions
@@ -0,0 +1,29 @@
+import { afterEach, describe, expect, it } from "vitest";
+import {
+  consumeFileWriteReceipt,
+  fileContentVersion,
+  recordFileWriteReceipt,
+  resetFileWriteReceipts,
+} from "./fileVersion";
+
+afterEach(resetFileWriteReceipts);
+
+describe("file versions and write receipts", () => {
+  it("produces a strong quoted SHA-256 ETag", () => {
+    expect(fileContentVersion("abc")).toBe(
+      '"sha256:ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad"',
+    );
+  });
+
+  it("attaches each API write identity to exactly one watcher echo", () => {
+    const receipt = {
+      path: "index.html",
+      version: fileContentVersion("after"),
+      writeToken: "write-1",
+    };
+    recordFileWriteReceipt("/project/index.html", receipt);
+
+    expect(consumeFileWriteReceipt("/project/index.html")).toEqual(receipt);
+    expect(consumeFileWriteReceipt("/project/index.html")).toBeNull();
+  });
+});