code: func (api *PrivateLightServerAPI) GetClientCapacity(id enode.ID) hexutil.Uint64 {
  	api.server.priorityClientPool.lock.Lock()
  	defer api.server.priorityClientPool.lock.Unlock()
  
  	return hexutil.Uint64(api.server.priorityClientPool.clients[id].cap)
  }
docs: // GetClientCapacity returns the capacity assigned to a given client