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@sentry/cloudflare: Durable Object methods called from the constructor's blockConcurrencyWhile callback are captured as untraced RPC entries

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#24,735 2 commentaires 0 réactions 1 personne assignée Voir sur GitHub

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@JPeer264 y travaille déjà.

Depuis le 28/9/2026.

Évaluation

Difficulté
4/5
Temps estimé
3-5 jours
Accessibilité débutants
58/100
Type d'issue
Bug
Clarté
Plutôt claire
Activité
Active
Stack technique
typescript
Domaine
backend, cloud

Piste de recherche

Start in durableobject.ts at the RPC prototype wrapper and its startNewTrace branch, then run the provided Store reproduction with @cloudflare/vitest-pool-workers. Trace the constructor's blockConcurrencyWhile callback and verify that a caught init error no longer produces an error event or an untraced RPC entry.

Rédigé par le modèle d'indexation à partir du texte de l'issue.

Description

Bug Cloudflare Workers
Version

@sentry/cloudflare 10.75.1, with enableRpcTracePropagation: true

Summary

Since #24512, the RPC prototype wrapper instruments any prototype method called while the isolation scope is the default one, in a new trace. The wrapper is installed after construction, but a blockConcurrencyWhile callback started in the constructor runs after that, with no isolation scope. So a method the object calls on itself during initialisation is treated as an untraced RPC entry. If it throws, the error is captured as handled: false with mechanism auto.faas.cloudflare.durable_object, even when the object catches it.

Repro
class Store extends DurableObject {
  failure?: Error;
  constructor(ctx: DurableObjectState, env: Env) {
    super(ctx, env);
    void ctx.blockConcurrencyWhile(async () => {
      try { this.init(); } catch (e) { this.failure = e as Error; }
    });
  }
  init(): void { throw new Error('init failed'); }
  ping(): string { return this.failure ? 'degraded' : 'ok'; }
}

export const Instrumented = Sentry.instrumentDurableObjectWithSentry(
  (env) => ({ dsn: env.SENTRY_DSN, enableRpcTracePropagation: true }),
  Store,
);

Call ping() on a stub.

Expected: no error event. The error is caught inside the object.

Actual: one error event for init failed, handled: false, in its own trace.

Observed in real workerd (@cloudflare/vitest-pool-workers). With a raised Error.stackTraceLimit, the capturing frame is the untraced startNewTrace branch in durableobject.ts, wrapping the method called from the constructor's blockConcurrencyWhile callback.

Notes

Declaring internal methods as #private avoids it, because they are no longer on the prototype, and that matches Cloudflare's RPC visibility guidance (https://developers.cloudflare.com/workers/runtime-apis/rpc/visibility/). It may be worth either documenting that, or running constructor-time blockConcurrencyWhile callbacks inside an isolation scope so they are not mistaken for RPC entries.

Langage dominant
TypeScript
Étoiles
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Forks
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Merge moyen
1 j 17 h
PR mergées (30 j)
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