src/claude-quota.ts

@@ -8,6 +8,8 @@ import type { QuotaSnapshot, QuotaStatus, QuotaWindow } from "./quota.js";
 const USAGE_URL = "https://api.anthropic.com/api/oauth/usage";
 const POLL_MS = 60_000;
 const TIMEOUT_MS = 5_000;
+const RETRY_MS = 2_000;
+const RETRIES = 4;
 const WEEK = 604_800;
 
 type QuotaFetch = (input: string | URL | Request, init?: RequestInit) => Promise<Response>;
@@ -108,6 +110,7 @@ export class ClaudeQuotaTracker {
     private timer: ReturnType<typeof setInterval> | undefined;
     private request: Promise<void> | undefined;
     private controller: AbortController | undefined;
+    private wake: (() => void) | undefined;
     private disposed = false;
 
     constructor(
@@ -115,6 +118,7 @@ export class ClaudeQuotaTracker {
         private readonly fetcher: QuotaFetch = fetch,
         private readonly pollMs = POLL_MS,
         private readonly path = claudeCredentialsPath(),
+        private readonly retryMs = RETRY_MS,
     ) {}
 
     async init() {
@@ -131,22 +135,44 @@ export class ClaudeQuotaTracker {
     }
 
     private async query() {
+        for (let attempt = 0; ; attempt++) {
+            if (await this.attempt()) return;
+            if (attempt >= RETRIES || this.disposed) return;
+            await this.sleep(this.retryMs * 2 ** attempt);
+        }
+    }
+
+    private sleep(ms: number) {
+        return new Promise<void>((resolve) => {
+            const timer = setTimeout(wake, ms);
+            this.wake = wake;
+            function wake() {
+                clearTimeout(timer);
+                resolve();
+            }
+        });
+    }
+
+    /** Returns true when done, false when the attempt failed and should be retried. */
+    private async attempt() {
         try {
-            let credential: z.infer<typeof credentials>["claudeAiOauth"] | undefined;
+            let text: string;
             try {
-                const parsed = credentials.safeParse(JSON.parse(await readFile(this.path, "utf8")));
-                credential = parsed.success ? parsed.data.claudeAiOauth : undefined;
-            } catch {
-                credential = undefined;
-            }
-            if (!credential) {
-                if (this.latest) {
+                text = await readFile(this.path, "utf8");
+            } catch (error) {
+                if (!(error instanceof Error && "code" in error && error.code === "ENOENT"))
+                    return false;
+                if (this.latest && !this.disposed) {
                     this.latest = undefined;
-                    await this.changed();
+                    await this.changed().catch(() => {});
                 }
-                return;
+                return true;
             }
-            if (credential.expiresAt <= Date.now() || this.disposed) return;
+            const parsed = credentials.safeParse(JSON.parse(text));
+            if (!parsed.success) return false;
+            const credential = parsed.data.claudeAiOauth;
+            if (this.disposed) return true;
+            if (credential.expiresAt <= Date.now()) return false;
             const controller = new AbortController();
             this.controller = controller;
             const timeout = setTimeout(() => controller.abort(), TIMEOUT_MS);
@@ -164,19 +190,21 @@ export class ClaudeQuotaTracker {
                 clearTimeout(timeout);
                 if (this.controller === controller) this.controller = undefined;
             }
-            if (!response.ok) return;
+            if (!response.ok) return false;
             // SAFETY: Response.json yields JSON values; usagePayload validates fields used.
             const payload = (await response.json()) as Schema.Json;
             const snapshot = normalizeClaudeQuota(
                 payload,
                 credential.subscriptionType ?? "unknown",
             );
-            if (!snapshot || this.disposed) return;
+            if (this.disposed) return true;
+            if (!snapshot) return false;
             this.latest = snapshot;
-            await this.changed();
         } catch {
-            return;
+            return false;
         }
+        await this.changed().catch(() => {});
+        return true;
     }
 
     status(): QuotaStatus | undefined {
@@ -193,6 +221,7 @@ export class ClaudeQuotaTracker {
     async dispose() {
         this.disposed = true;
         this.controller?.abort();
+        this.wake?.();
         if (this.timer) clearInterval(this.timer);
         this.timer = undefined;
         await this.request;

tests/claude-quota.test.ts

@@ -148,6 +148,7 @@ test("expired token skips fetch and keeps last snapshot", async () => {
         },
         60_000,
         path,
+        1,
     );
     await tracker.init();
     await writeFile(path, credentials(Date.now() - 1));
@@ -156,3 +157,134 @@ test("expired token skips fetch and keeps last snapshot", async () => {
     expect(tracker.status()?.windows).toHaveLength(4);
     await tracker.dispose();
 });
+
+test("failed fetch retries with re-read credentials", async () => {
+    await writeFile(path, credentials(Date.now() + 3_600_000));
+    const tokens: Array<string | null> = [];
+    let changed = 0;
+    const tracker = new ClaudeQuotaTracker(
+        async () => {
+            changed++;
+        },
+        async (_input, init) => {
+            tokens.push(new Headers(init?.headers).get("authorization"));
+            if (tokens.length > 1) return Response.json(payload);
+            await writeFile(
+                path,
+                credentials(Date.now() + 3_600_000).replace("token-123", "token-456"),
+            );
+            throw new Error("network down");
+        },
+        60_000,
+        path,
+        1,
+    );
+    await tracker.init();
+    expect(tokens).toEqual(["Bearer token-123", "Bearer token-456"]);
+    expect(tracker.status()?.plan).toBe("max");
+    expect(changed).toBe(1);
+    await tracker.dispose();
+});
+
+test("corrupt credentials file keeps previous status and retries", async () => {
+    await writeFile(path, credentials(Date.now() + 3_600_000));
+    let calls = 0;
+    let changed = 0;
+    const tracker = new ClaudeQuotaTracker(
+        async () => {
+            changed++;
+        },
+        async () => {
+            calls++;
+            return Response.json(payload);
+        },
+        60_000,
+        path,
+        1,
+    );
+    await tracker.init();
+    await writeFile(path, "{not json");
+    await tracker.refresh();
+    await writeFile(path, JSON.stringify({ claudeAiOauth: { accessToken: 1 } }));
+    await tracker.refresh();
+    expect(calls).toBe(1);
+    expect(changed).toBe(1);
+    expect(tracker.status()?.windows).toHaveLength(4);
+    await tracker.dispose();
+});
+
+test("missing credentials file clears status without retry", async () => {
+    await writeFile(path, credentials(Date.now() + 3_600_000));
+    let calls = 0;
+    let changed = 0;
+    const tracker = new ClaudeQuotaTracker(
+        async () => {
+            changed++;
+        },
+        async () => {
+            calls++;
+            return Response.json(payload);
+        },
+        60_000,
+        path,
+        10_000,
+    );
+    await tracker.init();
+    await rm(path);
+    const start = performance.now();
+    await tracker.refresh();
+    expect(performance.now() - start).toBeLessThan(1_000);
+    expect(calls).toBe(1);
+    expect(changed).toBe(2);
+    expect(tracker.status()).toBeUndefined();
+    await tracker.dispose();
+});
+
+test("gives up after five failed attempts", async () => {
+    await writeFile(path, credentials(Date.now() + 3_600_000));
+    let calls = 0;
+    const tracker = new ClaudeQuotaTracker(
+        async () => {},
+        async () => {
+            calls++;
+            return new Response("nope", { status: 500 });
+        },
+        60_000,
+        path,
+        1,
+    );
+    await tracker.init();
+    expect(calls).toBe(5);
+    expect(tracker.status()).toBeUndefined();
+    await tracker.refresh();
+    expect(calls).toBe(10);
+    await tracker.dispose();
+});
+
+test("dispose during backoff resolves quickly", async () => {
+    await writeFile(path, credentials(Date.now() + 3_600_000));
+    let calls = 0;
+    let changed = 0;
+    const tracker = new ClaudeQuotaTracker(
+        async () => {
+            changed++;
+        },
+        async () => {
+            calls++;
+            throw new Error("network down");
+        },
+        60_000,
+        path,
+        60_000,
+    );
+    const init = tracker.init();
+    while (calls === 0) await new Promise((resolve) => setTimeout(resolve, 1));
+    await new Promise((resolve) => setTimeout(resolve, 5));
+    const start = performance.now();
+    await tracker.dispose();
+    await init;
+    expect(performance.now() - start).toBeLessThan(1_000);
+    expect(calls).toBe(1);
+    expect(changed).toBe(0);
+    expect(tracker.status()).toBeUndefined();
+});