errSRCannotJoin = SRError{
		Cause: errors.New("this site is already configured for site-replication"),
		Code:  ErrSiteReplicationInvalidRequest,
	}
	errSRDuplicateSites = SRError{
		Cause: errors.New("duplicate sites provided for site-replication"),
		Code:  ErrSiteReplicationInvalidRequest,
	}
	errSRSelfNotFound = SRError{
		Cause: errors.New("none of the given sites correspond to the current one"),
		Code:  ErrSiteReplicationInvalidRequest,

			return
		}
	}
}

// AddWorker adds a replication worker to the pool.
// An optional pointer to a tracker that will be atomically
// incremented when operations are running can be provided.
func (p *ReplicationPool) AddWorker(input <-chan ReplicationWorkerOperation, opTracker *int32) {
	for {
		select {
		case <-p.ctx.Done():
			return
		case oi, ok := <-input:
			if !ok {

	//   request; If clientToken is provided, request can only be
	//   to continue receiving logs, so it cannot be start or
	//   stop;
	if (hip.forceStart && hip.forceStop) ||
		(hip.clientToken != "" && (hip.forceStart || hip.forceStop)) {
		err = ErrInvalidRequest
		return
	}

	// ignore body if clientToken is provided
	if hip.clientToken == "" {