Add metrics, request logs, and graceful shutdown

tests/repo-counter.test.js

@@ -18,9 +18,10 @@ async function createHarness(options = {}) {
 import { appendFileSync, cpSync } from "node:fs";
 const args = process.argv.slice(2);
 const command = args.includes("clone") ? "clone" : args.includes("rev-parse") ? "rev-parse" : "other";
+appendFileSync(process.env.LOC_TEST_CLONE_LOG, args.join(" ") + "\\n");
 if (command === "clone") {
-  appendFileSync(process.env.LOC_TEST_CLONE_LOG, "clone\\n");
   if (process.env.LOC_TEST_HANG === "1") setInterval(() => {}, 1000);
+  if (process.env.LOC_TEST_FAIL === "1") process.exit(2);
   cpSync(process.env.LOC_TEST_FIXTURE, args.at(-1), { recursive: true });
 } else if (command === "rev-parse") {
   process.stdout.write("fixture-commit\\n");
@@ -67,6 +68,7 @@ if (command === "clone") {
       delete process.env.LOC_TEST_FIXTURE;
       delete process.env.LOC_TEST_CLONE_LOG;
       delete process.env.LOC_TEST_HANG;
+      delete process.env.LOC_TEST_FAIL;
       await rm(root, { recursive: true, force: true });
     }
   };
@@ -86,7 +88,28 @@ test("scans fixture repositories, caches duplicate work, and cleans clone direct
     assert.equal(first.commit, "fixture-commit");
     assert.equal(second.lineCount, 2);
     assert.equal(third.cached, true);
-    assert.equal((await readFile(harness.cloneLog, "utf8")).trim().split("\n").length, 1);
+    const commands = await readFile(harness.cloneLog, "utf8");
+    assert.equal(commands.split("\n").filter((line) => line.includes(" clone ")).length, 1);
+    assert.deepEqual(await readdir(harness.config.tempRoot), []);
+  } finally {
+    await harness.cleanup();
+  }
+});
+
+test("checks out requested refs and cleans up failed clones", async () => {
+  const harness = await createHarness();
+  try {
+    await writeFile(path.join(harness.fixture, "main.ts"), "export {};\n");
+    await harness.service.count({ repo: "https://example.test/demo.git", ref: "release-1", sshKey: null });
+    const commands = await readFile(harness.cloneLog, "utf8");
+    assert.match(commands, /fetch --depth 1 origin release-1/);
+    assert.match(commands, /checkout FETCH_HEAD/);
+
+    process.env.LOC_TEST_FAIL = "1";
+    await assert.rejects(
+      harness.service.count({ repo: "https://example.test/failure.git", ref: null, sshKey: null }),
+      { statusCode: 400 }
+    );
     assert.deepEqual(await readdir(harness.config.tempRoot), []);
   } finally {
     await harness.cleanup();