Make client generic.

group.go

@@ -21,6 +21,13 @@ import (
 	"github.com/pion/webrtc/v2"
 )
 
+type client interface {
+	getGroup() *group
+	getId() string
+	getUsername() string
+	pushConn(conn *upConnection, tracks []*upTrack, label string) error
+}
+
 type chatHistoryEntry struct {
 	id    string
 	user  string
@@ -41,7 +48,7 @@ type group struct {
 	locked      uint32
 
 	mu      sync.Mutex
-	clients map[string]*webClient
+	clients map[string]client
 	history []chatHistoryEntry
 }
 
@@ -64,7 +71,7 @@ type getUpAction struct {
 }
 
 type pushConnsAction struct {
-	c *webClient
+	c client
 }
 
 type connectionFailedAction struct {
@@ -122,7 +129,7 @@ func addGroup(name string, desc *groupDescription) (*group, error) {
 		g = &group{
 			name:        name,
 			description: desc,
-			clients:     make(map[string]*webClient),
+			clients:     make(map[string]client),
 		}
 		groups.groups[name] = g
 	} else if desc != nil {
@@ -195,7 +202,7 @@ type userid struct {
 	username string
 }
 
-func addClient(name string, client *webClient, user, pass string) (*group, []userid, error) {
+func addClient(name string, client client, user, pass string) (*group, []userid, error) {
 	g, err := addGroup(name, nil)
 	if err != nil {
 		return nil, nil, err
@@ -205,7 +212,10 @@ func addClient(name string, client *webClient, user, pass string) (*group, []use
 	if err != nil {
 		return nil, nil, err
 	}
-	client.permissions = perms
+	c, ok := client.(*webClient)
+	if ok {
+		c.permissions = perms
+	}
 
 	if !perms.Op && atomic.LoadUint32(&g.locked) != 0 {
 		return nil, nil, userError("group is locked")
@@ -219,34 +229,34 @@ func addClient(name string, client *webClient, user, pass string) (*group, []use
 			return nil, nil, userError("too many users")
 		}
 	}
-	if g.clients[client.id] != nil {
+	if g.clients[client.getId()] != nil {
 		return nil, nil, protocolError("duplicate client id")
 	}
 
 	var users []userid
 	for _, c := range g.clients {
-		users = append(users, userid{c.id, c.username})
+		users = append(users, userid{c.getId(), c.getUsername()})
 	}
-	g.clients[client.id] = client
+	g.clients[client.getId()] = client
 	return g, users, nil
 }
 
-func delClient(c *webClient) {
-	c.group.mu.Lock()
-	defer c.group.mu.Unlock()
-	g := c.group
+func delClient(c client) {
+	g := c.getGroup()
+	g.mu.Lock()
+	defer g.mu.Unlock()
 
-	if g.clients[c.id] != c {
+	if g.clients[c.getId()] != c {
 		log.Printf("Deleting unknown client")
 		return
 	}
-	delete(g.clients, c.id)
+	delete(g.clients, c.getId())
 }
 
-func (g *group) getClients(except *webClient) []*webClient {
+func (g *group) getClients(except client) []client {
 	g.mu.Lock()
 	defer g.mu.Unlock()
-	clients := make([]*webClient, 0, len(g.clients))
+	clients := make([]client, 0, len(g.clients))
 	for _, c := range g.clients {
 		if c != except {
 			clients = append(clients, c)
@@ -255,16 +265,16 @@ func (g *group) getClients(except *webClient) []*webClient {
 	return clients
 }
 
-func (g *group) getClientUnlocked(id string) *webClient {
-	for _, c := range g.clients {
-		if c.id == id {
+func (g *group) getClientUnlocked(id string) client {
+	for idd, c := range g.clients {
+		if idd == id {
 			return c
 		}
 	}
 	return nil
 }
 
-func (g *group) Range(f func(c *webClient) bool) {
+func (g *group) Range(f func(c client) bool) {
 	g.mu.Lock()
 	defer g.mu.Unlock()
 	for _, c := range g.clients {
@@ -311,42 +321,12 @@ func (err writerDeadError) Error() string {
 	return "client writer died"
 }
 
-func (c *webClient) write(m clientMessage) error {
-	select {
-	case c.writeCh <- m:
-		return nil
-	case <-c.writerDone:
-		return writerDeadError(0)
-	}
-}
-
-func (c *webClient) error(err error) error {
-	switch e := err.(type) {
-	case userError:
-		return c.write(clientMessage{
-			Type:  "error",
-			Value: string(e),
-		})
-	default:
-		return err
-	}
-}
-
 type clientDeadError int
 
 func (err clientDeadError) Error() string {
 	return "client dead"
 }
 
-func (c *webClient) action(m interface{}) error {
-	select {
-	case c.actionCh <- m:
-		return nil
-	case <-c.done:
-		return clientDeadError(0)
-	}
-}
-
 type groupUser struct {
 	Username string `json:"username,omitempty"`
 	Password string `json:"password,omitempty"`
@@ -453,42 +433,6 @@ func getPermission(desc *groupDescription, user, pass string) (userPermission, e
 	return p, userError("not authorised")
 }
 
-func setPermission(g *group, id string, perm string) error {
-	g.mu.Lock()
-	defer g.mu.Unlock()
-
-	c := g.getClientUnlocked(id)
-	if c == nil {
-		return userError("no such user")
-	}
-
-	switch perm {
-	case "op":
-		c.permissions.Op = true
-	case "unop":
-		c.permissions.Op = false
-	case "present":
-		c.permissions.Present = true
-	case "unpresent":
-		c.permissions.Present = false
-	default:
-		return userError("unknown permission")
-	}
-	return c.action(permissionsChangedAction{})
-}
-
-func kickClient(g *group, id string) error {
-	g.mu.Lock()
-	defer g.mu.Unlock()
-
-	c := g.getClientUnlocked(id)
-	if c == nil {
-		return userError("no such user")
-	}
-
-	return c.action(kickAction{})
-}
-
 type publicGroup struct {
 	Name        string `json:"name"`
 	ClientCount int    `json:"clientCount"`
@@ -580,9 +524,12 @@ func getGroupStats() []groupStats {
 			clients: make([]clientStats, 0, len(clients)),
 		}
 		for _, c := range clients {
+			c, ok := c.(*webClient)
+			if ok {
 				cs := getClientStats(c)
 				stats.clients = append(stats.clients, cs)
 			}
+		}
 		sort.Slice(stats.clients, func(i, j int) bool {
 			return stats.clients[i].id < stats.clients[j].id
 		})

webclient.go

@@ -107,6 +107,18 @@ type webClient struct {
 	up   map[string]*upConnection
 }
 
+func (c *webClient) getGroup() *group {
+	return c.group
+}
+
+func (c *webClient) getId() string {
+	return c.id
+}
+
+func (c *webClient) getUsername() string {
+	return c.username
+}
+
 type rateMap map[string]uint32
 
 func (v *rateMap) UnmarshalJSON(b []byte) error {
@@ -259,8 +271,11 @@ func startClient(conn *websocket.Conn) (err error) {
 		Username: c.username,
 	}
 	for _, c := range clients {
+		c, ok := c.(*webClient)
+		if ok {
 			c.write(u)
 		}
+	}
 
 	defer func() {
 		clients := g.getClients(c)
@@ -271,8 +286,11 @@ func startClient(conn *websocket.Conn) (err error) {
 			Del:      true,
 		}
 		for _, c := range clients {
+			c, ok := c.(*webClient)
+			if ok {
 				c.write(u)
 			}
+		}
 	}()
 
 	return clientLoop(c, conn)
@@ -403,7 +421,7 @@ func addUpConn(c *webClient, id string) (*upConnection, error) {
 		if tracks != nil {
 			clients := c.group.getClients(c)
 			for _, cc := range clients {
-				pushConn(cc, u, tracks, u.label)
+				cc.pushConn(u, tracks, u.label)
 			}
 		}
 	})
@@ -1208,7 +1226,10 @@ func (c *webClient) setRequested(requested map[string]uint32) error {
 	go func() {
 		clients := c.group.getClients(c)
 		for _, cc := range clients {
-			cc.action(pushConnsAction{c})
+			ccc, ok := cc.(*webClient)
+			if ok {
+				ccc.action(pushConnsAction{c})
+			}
 		}
 	}()
 
@@ -1250,11 +1271,18 @@ func addDownConnTracks(c *webClient, remote *upConnection, tracks []*upTrack) (*
 	return down, nil
 }
 
-func pushConn(c *webClient, conn *upConnection, tracks []*upTrack, label string) {
-	c.action(addConnAction{conn, tracks})
+func (c *webClient) pushConn(conn *upConnection, tracks []*upTrack, label string) error {
+	err := c.action(addConnAction{conn, tracks})
+	if err != nil {
+		return err
+	}
 	if label != "" {
-		c.action(addLabelAction{conn.id, conn.label})
+		err := c.action(addLabelAction{conn.id, conn.label})
+		if err != nil {
+			return err
 		}
+	}
+	return nil
 }
 
 func clientLoop(c *webClient, conn *websocket.Conn) error {
@@ -1354,7 +1382,7 @@ func clientLoop(c *webClient, conn *websocket.Conn) error {
 				for _, u := range c.up {
 					tracks := make([]*upTrack, len(u.tracks))
 					copy(tracks, u.tracks)
-					go pushConn(a.c, u, tracks, u.label)
+					go a.c.pushConn(u, tracks, u.label)
 				}
 			case connectionFailedAction:
 				found := delUpConn(c, a.id)
@@ -1428,6 +1456,52 @@ func failConnection(c *webClient, id string, message string) error {
 	return nil
 }
 
+func setPermissions(g *group, id string, perm string) error {
+	g.mu.Lock()
+	defer g.mu.Unlock()
+
+	client := g.getClientUnlocked(id)
+	if client == nil {
+		return userError("no such user")
+	}
+
+	c, ok := client.(*webClient)
+	if !ok {
+		return userError("this is not a real user")
+	}
+
+	switch perm {
+	case "op":
+		c.permissions.Op = true
+	case "unop":
+		c.permissions.Op = false
+	case "present":
+		c.permissions.Present = true
+	case "unpresent":
+		c.permissions.Present = false
+	default:
+		return userError("unknown permission")
+	}
+	return c.action(permissionsChangedAction{})
+}
+
+func kickClient(g *group, id string) error {
+	g.mu.Lock()
+	defer g.mu.Unlock()
+
+	client := g.getClientUnlocked(id)
+	if client == nil {
+		return userError("no such user")
+	}
+
+	c, ok := client.(*webClient)
+	if !ok {
+		return userError("this is not a real user")
+	}
+
+	return c.action(kickAction{})
+}
+
 func handleClientMessage(c *webClient, m clientMessage) error {
 	switch m.Type {
 	case "request":
@@ -1476,20 +1550,26 @@ func handleClientMessage(c *webClient, m clientMessage) error {
 		c.group.addToChatHistory(m.Id, m.Username, m.Value, m.Me)
 		clients := c.group.getClients(c)
 		for _, cc := range clients {
+			cc, ok := cc.(*webClient)
+			if ok {
 				cc.write(m)
 			}
+		}
 	case "clearchat":
 		c.group.clearChatHistory()
 		m := clientMessage{Type: "clearchat"}
 		clients := c.group.getClients(nil)
 		for _, cc := range clients {
+			cc, ok := cc.(*webClient)
+			if ok {
 				cc.write(m)
 			}
+		}
 	case "op", "unop", "present", "unpresent":
 		if !c.permissions.Op {
 			return c.error(userError("not authorised"))
 		}
-		err := setPermission(c.group, m.Id, m.Type)
+		err := setPermissions(c.group, m.Id, m.Type)
 		if err != nil {
 			return c.error(err)
 		}
@@ -1619,3 +1699,33 @@ func clientWriter(conn *websocket.Conn, ch <-chan interface{}, done chan<- struc
 		}
 	}
 }
+
+func (c *webClient) action(m interface{}) error {
+	select {
+	case c.actionCh <- m:
+		return nil
+	case <-c.done:
+		return clientDeadError(0)
+	}
+}
+
+func (c *webClient) write(m clientMessage) error {
+	select {
+	case c.writeCh <- m:
+		return nil
+	case <-c.writerDone:
+		return writerDeadError(0)
+	}
+}
+
+func (c *webClient) error(err error) error {
+	switch e := err.(type) {
+	case userError:
+		return c.write(clientMessage{
+			Type:  "error",
+			Value: string(e),
+		})
+	default:
+		return err
+	}
+}