Method SendMessage

gateway/gateway.go:433–523

SendMessage sends a message (with specified parentID) to the channel on the selected destination bridge and returns a message ID or an error.

(
	rmsg *config.Message,
	dest *bridge.Bridge,
	channel *config.ChannelInfo,
	canonicalParentMsgID string,
)

// SendMessage sends a message (with specified parentID) to the channel on the selected
// destination bridge and returns a message ID or an error.
func (gw *Gateway) SendMessage(
	rmsg *config.Message,
	dest *bridge.Bridge,
	channel *config.ChannelInfo,
	canonicalParentMsgID string,
) (string, error) {
	msg := *rmsg
	// Only send the avatar download event to ourselves.
	if msg.Event == config.EventAvatarDownload {
		if channel.ID != getChannelID(rmsg) {
			return "", nil
		}
	} else {
		// do not send to ourself for any other event
		if channel.ID == getChannelID(rmsg) {
			return "", nil
		}
	}

	// Only send irc notices to irc
	if msg.Event == config.EventNoticeIRC && dest.Protocol != "irc" {
		return "", nil
	}

	// Too noisy to log like other events
	debugSendMessage := ""
	if msg.Event != config.EventUserTyping {
		debugSendMessage = fmt.Sprintf("=> Sending %#v from %s (%s) to %s (%s)", msg, msg.Account, rmsg.Channel, dest.Account, channel.Name)
	}

	msg.Channel = channel.Name
	msg.Avatar = gw.modifyAvatar(rmsg, dest)
	msg.Username = gw.modifyUsername(rmsg, dest)

	// exclude file delete event as the msg ID here is the native file ID that needs to be deleted
	if msg.Event != config.EventFileDelete {
		msg.ID = gw.getDestMsgID(rmsg.Protocol+" "+rmsg.ID, dest, channel)
	}

	// for api we need originchannel as channel
	if dest.Protocol == apiProtocol {
		msg.Channel = rmsg.Channel
	}

	msg.ParentID = gw.getDestMsgID(canonicalParentMsgID, dest, channel)
	if msg.ParentID == "" {
		msg.ParentID = strings.Replace(canonicalParentMsgID, dest.Protocol+" ", "", 1)
	}

	// if the parentID is still empty and we have a parentID set in the original message
	// this means that we didn't find it in the cache so set it to a "msg-parent-not-found" constant
	if msg.ParentID == "" && rmsg.ParentID != "" {
		msg.ParentID = config.ParentIDNotFound
	}

	drop, err := gw.modifyOutMessageTengo(rmsg, &msg, dest)
	if err != nil {
		gw.logger.Errorf("modifySendMessageTengo: %s", err)