chenhg5/cc-connect · error

reschedule failed: %w

Error message

reschedule failed: %w

What it means

After successfully persisting the field change, UpdateJob reschedules the cron entry when the change affects firing (cron_expr or enabled). If cs.scheduleJob returns an error, the store already has the new value but the in-memory timer could not be updated, so the error is wrapped with "reschedule failed".

Source

Thrown at core/cron.go:606

		cs.mu.Lock()
		if entryID, ok := cs.entries[id]; ok {
			cs.cron.Remove(entryID)
			delete(cs.entries, id)
		}
		cs.mu.Unlock()
	}

	// Update the field
	if !cs.store.Update(id, field, value) {
		return fmt.Errorf("failed to update field %q (may be read-only or invalid type)", field)
	}

	// Reschedule if needed
	if needsReschedule {
		updatedJob := cs.store.Get(id)
		if updatedJob != nil && updatedJob.Enabled {
			if err := cs.scheduleJob(updatedJob); err != nil {
				return fmt.Errorf("reschedule failed: %w", err)
			}
		}
	}

	return nil
}

func (cs *CronScheduler) Store() *CronStore {
	return cs.store
}

// NextRun returns the next scheduled run time for a job, or zero if not scheduled.
func (cs *CronScheduler) NextRun(jobID string) time.Time {
	cs.mu.RLock()
	entryID, ok := cs.entries[jobID]
	cs.mu.RUnlock()
	if !ok {
		return time.Time{}

View on GitHub (pinned to 4000b2338a)

Solutions

1. Validate the cron expression with the same parser scheduleJob uses before calling UpdateJob
2. Retry with a valid cron_expr value; the stored state is already updated so only the timer needs fixing
3. Check scheduler logs/next-fire time; restarting the daemon will rebuild timers from the store

Example fix

// before
cs.UpdateJob(id, "cron_expr", "99 * * * *") // invalid expression
// after
if parser.Valid("99 * * * *") == false { return errors.New("invalid cron expression") }
cs.UpdateJob(id, "cron_expr", "0 * * * *")

if field == "cron_expr" {
    if _, err := cron.ParseStandard(expr); err != nil { return err }
}

if err := cs.UpdateJob(id, "cron_expr", expr); err != nil {
    var wrapped error
    if errors.Unwrap(err) != nil { wrapped = err }
    slog.Error("cron reschedule failed; store updated but timer not rebuilt", "id", id, "err", err)
    _ = wrapped
}

When it happens

Trigger: Updating cron_expr to an invalid expression that scheduleJob cannot parse, or enabling a job whose schedule cannot be computed — any scheduleJob failure after a successful store.Update.

Common situations: User edits a job to a malformed cron expression via handleCronEdit; the new expression was accepted by the store but rejected by the scheduler.

Understand the failure class

Background: "Invalid value" and "allowed values are" config errors: what your library rejected and how to fix it — this error's family across 41 libraries.

Related errors

• %s must be true or false
• timeout_mins must be >= 0
• unknown or invalid field: %s
• invalid cron expression %q: %w
• job %q not found

AI-assisted analysis of chenhg5/cc-connect@4000b2338a (2026-09-06). Data as JSON: /api/errors/3ebec5dc45abe7ea. Report an issue: GitHub.