dlock

type DLock interface {
	// Lock acquries the distributed lock, blocking if necessary.  If
	// the lock is acquired, it returns a context that should be used
	// in any subsequent blocking requests, so that if you lose the lock,
	// the requests get cancelled correctly.
	Lock(context.Context) (context.Context, error)
	// Unlock releases the distributed lock.
	Unlock(context.Context) error
}