package platform

import "sync"

// schemaReadyGate serializes schema probes and caches only a successful result.
// Request cancellation and transient database failures must remain retryable.
type schemaReadyGate struct {
	mu    sync.Mutex
	ready bool
}

func (gate *schemaReadyGate) ensure(check func() error) error {
	gate.mu.Lock()
	defer gate.mu.Unlock()
	if gate.ready {
		return nil
	}
	if err := check(); err != nil {
		return err
	}
	gate.ready = true
	return nil
}