Initial bot functionality

* The bot now properly joins the management room
* The management room is persisted in the database
* Welcome/help messages are sent in the management room

bridge/portal.go

@@ -0,0 +1,95 @@
+package bridge
+
+import (
+	"fmt"
+
+	log "maunium.net/go/maulogger/v2"
+	"maunium.net/go/mautrix/event"
+	"maunium.net/go/mautrix/id"
+
+	"gitlab.com/beeper/discord/database"
+)
+
+type PortalMatrixMessage struct {
+	evt  *event.Event
+	user *User
+}
+
+type Portal struct {
+	*database.Portal
+
+	bridge *Bridge
+	log    log.Logger
+
+	matrixMessages chan PortalMatrixMessage
+}
+
+func (b *Bridge) loadPortal(dbPortal *database.Portal, key *database.PortalKey) *Portal {
+	// If we weren't given a portal we'll attempt to create it if a key was
+	// provided.
+	if dbPortal == nil {
+		if key == nil {
+			return nil
+		}
+
+		dbPortal = b.db.Portal.New()
+		dbPortal.Key = *key
+		dbPortal.Insert()
+	}
+
+	portal := b.NewPortal(dbPortal)
+
+	// No need to lock, it is assumed that our callers have already acquired
+	// the lock.
+	b.portalsByID[portal.Key] = portal
+	if portal.MXID != "" {
+		b.portalsByMXID[portal.MXID] = portal
+	}
+
+	return portal
+}
+
+func (b *Bridge) GetPortalByMXID(mxid id.RoomID) *Portal {
+	b.portalsLock.Lock()
+	defer b.portalsLock.Unlock()
+
+	portal, ok := b.portalsByMXID[mxid]
+	if !ok {
+		return b.loadPortal(b.db.Portal.GetByMXID(mxid), nil)
+	}
+
+	return portal
+}
+
+func (b *Bridge) NewPortal(dbPortal *database.Portal) *Portal {
+	portal := &Portal{
+		Portal: dbPortal,
+		bridge: b,
+		log:    b.log.Sub(fmt.Sprintf("Portal/%s", dbPortal.Key)),
+
+		matrixMessages: make(chan PortalMatrixMessage, b.config.Bridge.PortalMessageBuffer),
+	}
+
+	go portal.messageLoop()
+
+	return portal
+}
+
+func (p *Portal) HandleMatrixInvite(sender *User, evt *event.Event) {
+	// Look up an existing puppet or create a new one.
+	puppet := p.bridge.GetPuppetByMXID(id.UserID(evt.GetStateKey()))
+	if puppet != nil {
+		p.log.Infoln("no puppet for %v", sender)
+		// Open a conversation on the discord side?
+	}
+	p.log.Infoln("puppet:", puppet)
+}
+
+func (p *Portal) messageLoop() {
+	for {
+		select {
+		case msg := <-p.matrixMessages:
+			p.log.Infoln("got message", msg)
+		}
+	}
+}