code: func (h *Handler) Endpoint(key data.Base64String) (*data.Base64String, error) {
  	logger := h.logger.Add("type", "agent/tor-somc.Handler")
  
  	channelsStructs, err := h.db.SelectAllFrom(data.ChannelTable, "")
  	if err != nil {
  		h.logger.Error(err.Error())
  		return nil, ErrInternal
  	}
  
  	for _, chanStruct := range channelsStructs {
  		channel := chanStruct.(*data.Channel)
  		channelKey, err := h.channelKey(logger, channel)
  		if err != nil {
  			h.logger.Error(err.Error())
  			return nil, ErrInternal
  		}
  		if channelKey == key {
  			endpoint, err := h.endpointByChannelID(logger, channel.ID)
  			if err != nil {
  				return nil, err
  			}
  			return &endpoint.RawMsg, nil
  		}
  	}
  
  	return nil, ErrChannelNotFound
  }
docs: // Endpoint returns endpoint msg for a channel with given key.