Reuse shared HTTP classifier for WHOOP and Fitbit

src/lib/fitbit/response-classifier.ts

@@ -1,19 +1,17 @@
 /**
  * Off-response classifier for Fitbit / Google Health API replies (v1.12.0).
  *
- * Mirrors the WHOOP classifier (`src/lib/whoop/response-classifier.ts`) but
- * speaks the Google Health wire. Like WHOOP, Google signals failure through the
- * HTTP status code itself (no `status` field embedded in a 200 body), so this
- * classifier is HTTP-status-driven.
- *
- * Classification buckets:
+ * Like WHOOP, Google signals failure through the HTTP status code itself (no
+ * `status` field embedded in a 200 body), so the classification is
+ * status-driven. The shared core lives in
+ * `src/lib/integrations/http-status-classifier.ts`; this module re-exports it
+ * under the Fitbit-specific names callers already use.
  *
  *   - `success`         → HTTP 2xx
  *   - `transient`       → retryable: HTTP 429 (rate-limited — honour
  *                         `Retry-After` for backoff at the call site), 5xx
  *                         upstream outages, 3xx CDN/network glitches, and an
- *                         empty / off-spec body where we never reached the
- *                         envelope.
+ *                         unknown status where we never reached the envelope.
  *   - `reauth_required` → HTTP 401 / 403 — the access token is rejected or the
  *                         grant was revoked; the user must redo OAuth. (The
  *                         per-data-class 403 soft-skip lives in `sync.ts`'s
@@ -24,99 +22,37 @@
  *                         request or a contract mismatch that retrying without
  *                         operator intervention will not fix.
  *
- * The classifier is conservative: anything it doesn't recognise defaults to
- * `transient` so a single unknown response doesn't hard-disable the
- * integration. The 3-strike admin-alert ladder in `recordSyncFailure` already
- * catches the "keeps happening" case for recurring transients.
- *
  * Unlike WHOOP, there is no `invalid_grant` token-body special-case: Google
  * signals a revoked refresh token with a 401 on the token endpoint, which the
  * status-driven classifier already buckets as `reauth_required`.
  */
 
-/** Outcome buckets for a Fitbit response. Same shape as WHOOP. */
-export type FitbitClassification =
-  | "success"
-  | "transient"
-  | "reauth_required"
-  | "persistent";
+import {
+  classifyHttpStatus,
+  classifyIntegrationError,
+  IntegrationApiError,
+  type ClassifiedHttpResponse,
+  type IntegrationClassification,
+} from "@/lib/integrations/http-status-classifier";
 
-export interface ClassifiedFitbitResponse {
-  classification: FitbitClassification;
-  /** The HTTP status code that drove the verdict (undefined if none seen). */
-  httpStatus: number | undefined;
-  /** Short human-readable label for logs / audit details. */
-  reason: string;
-}
+/** Outcome buckets for a Fitbit response. */
+export type FitbitClassification = IntegrationClassification;
 
-/**
- * Classify a single Fitbit / Google Health API response by its HTTP status.
- *
- * @param httpStatus  The HTTP status from fetch.
- */
+export type ClassifiedFitbitResponse = ClassifiedHttpResponse;
+
+/** Classify a single Fitbit / Google Health API response by its HTTP status. */
 export function classifyFitbitResponse(
   httpStatus: number,
 ): ClassifiedFitbitResponse {
-  if (httpStatus >= 200 && httpStatus < 300) {
-    return { classification: "success", httpStatus, reason: "ok" };
-  }
-  // 429 is rate-limit — honour `Retry-After` for backoff at the call site, but
-  // the verdict is a plain transient so the next sync retries.
-  if (httpStatus === 429) {
-    return { classification: "transient", httpStatus, reason: "http_429" };
-  }
-  // 401/403 — the bearer token is rejected or the grant revoked. The user has
-  // to reconnect; do not retry silently. (A per-data-class 403 soft-skip is
-  // applied in sync.ts before this verdict drives a connection-wide reauth.)
-  if (httpStatus === 401 || httpStatus === 403) {
-    return {
-      classification: "reauth_required",
-      httpStatus,
-      reason: `http_${httpStatus}`,
-    };
-  }
-  // Any other 4xx is a malformed request / contract mismatch — persistent.
-  if (httpStatus >= 400 && httpStatus < 500) {
-    return {
-      classification: "persistent",
-      httpStatus,
-      reason: `http_${httpStatus}`,
-    };
-  }
-  // 5xx upstream outage — retryable.
-  if (httpStatus >= 500 && httpStatus < 600) {
-    return {
-      classification: "transient",
-      httpStatus,
-      reason: `http_${httpStatus}`,
-    };
-  }
-  // 3xx (a CDN / redirect glitch — safeFetch uses redirect:"manual", so a
-  // surfaced 3xx is unexpected) and everything else defaults to transient.
-  return {
-    classification: "transient",
-    httpStatus,
-    reason: `http_${httpStatus}_unknown`,
-  };
+  return classifyHttpStatus(httpStatus);
 }
 
 /**
- * Typed Error subclass carrying the classification verdict so downstream
- * `try/catch` blocks can branch without re-parsing the message. Mirrors
- * `WhoopApiError`.
+ * Typed error carrying the classification verdict so downstream `try/catch`
+ * blocks can branch without re-parsing the message. Extends the shared base
+ * (message shape `Fitbit <verb> error: <status>` is preserved).
  */
-export class FitbitApiError extends Error {
-  readonly classification: FitbitClassification;
-  readonly httpStatus: number | undefined;
-  readonly reason: string;
-  readonly verb: string;
-  /**
-   * The OAuth `error` code from a token-endpoint failure body (e.g.
-   * `invalid_grant`). Captured for the audit trail; the classifier does not
-   * branch on it (Google signals a revoked grant with a 401 status).
-   */
-  readonly upstreamError: string | undefined;
-
+export class FitbitApiError extends IntegrationApiError {
   constructor(opts: {
     verb: string;
     classification: FitbitClassification;
@@ -124,20 +60,8 @@ export class FitbitApiError extends Error {
     reason: string;
     upstreamError?: string;
   }) {
-    const statusLabel =
-      typeof opts.httpStatus === "number" ? opts.httpStatus : "?";
-    const errSegment = opts.upstreamError ? ` - ${opts.upstreamError}` : "";
-    // Cap the message at 1024 chars in the constructor (same bound as
-    // WhoopApiError) so a misbehaving upstream returning a multi-MB error body
-    // can't bloat an AuditLog row downstream.
-    const raw = `Fitbit ${opts.verb} error: ${statusLabel}${errSegment}`;
-    super(raw.slice(0, 1024));
+    super({ vendor: "Fitbit", ...opts });
     this.name = "FitbitApiError";
-    this.verb = opts.verb;
-    this.classification = opts.classification;
-    this.httpStatus = opts.httpStatus;
-    this.reason = opts.reason;
-    this.upstreamError = opts.upstreamError;
   }
 }
 
@@ -149,12 +73,5 @@ export class FitbitApiError extends Error {
  * for callers that lose the original prototype across a pg-boss retry.
  */
 export function classifyFitbitError(err: unknown): FitbitClassification {
-  if (err instanceof FitbitApiError) return err.classification;
-
-  const msg = err instanceof Error ? err.message : String(err);
-  const m = /Fitbit\s+\w+\s+error:\s*(\d+)/.exec(msg);
-  if (!m) return "transient";
-  const status = Number.parseInt(m[1]!, 10);
-  if (!Number.isFinite(status)) return "transient";
-  return classifyFitbitResponse(status).classification;
+  return classifyIntegrationError(err, "Fitbit");
 }