Add websocket event and cache invalidation for deleting channels (#2807)

api/channel.go

@@ -687,14 +687,20 @@ func deleteChannel(c *Context, w http.ResponseWriter, r *http.Request) {
 
 		c.LogAudit("name=" + channel.Name)
 
-		post := &model.Post{ChannelId: channel.Id, Message: fmt.Sprintf(
-			c.T("api.channel.delete_channel.archived"),
-			user.Username)}
-		if _, err := CreatePost(c, post, false); err != nil {
-			l4g.Error(utils.T("api.channel.delete_channel.failed_post.error"), err)
-			c.Err = model.NewLocAppError("deleteChannel", "api.channel.delete_channel.failed_send.app_error", nil, "")
-			return
-		}
+		go func() {
+			InvalidateCacheForChannel(channel.Id)
+			message := model.NewMessage(c.TeamId, channel.Id, c.Session.UserId, model.ACTION_CHANNEL_DELETED)
+			PublishAndForget(message)
+
+			post := &model.Post{
+				ChannelId: channel.Id,
+				Message:   fmt.Sprintf(c.T("api.channel.delete_channel.archived"), user.Username),
+				Type:      model.POST_CHANNEL_DELETED,
+			}
+			if _, err := CreatePost(c, post, false); err != nil {
+				l4g.Error(utils.T("api.channel.delete_channel.failed_post.error"), err)
+			}
+		}()
 
 		result := make(map[string]string)
 		result["id"] = channel.Id

api/web_conn.go

@@ -118,6 +118,10 @@ func (c *WebConn) InvalidateCache() {
 	c.hasPermissionsToTeam = make(map[string]bool)
 }
 
+func (c *WebConn) InvalidateCacheForChannel(channelId string) {
+	delete(c.hasPermissionsToChannel, channelId)
+}
+
 func (c *WebConn) HasPermissionsToTeam(teamId string) bool {
 	perm, ok := c.hasPermissionsToTeam[teamId]
 	if !ok {

api/web_hub.go

@@ -10,21 +10,23 @@ import (
 )
 
 type Hub struct {
-	connections    map[*WebConn]bool
-	register       chan *WebConn
-	unregister     chan *WebConn
-	broadcast      chan *model.Message
-	stop           chan string
-	invalidateUser chan string
+	connections       map[*WebConn]bool
+	register          chan *WebConn
+	unregister        chan *WebConn
+	broadcast         chan *model.Message
+	stop              chan string
+	invalidateUser    chan string
+	invalidateChannel chan string
 }
 
 var hub = &Hub{
-	register:       make(chan *WebConn),
-	unregister:     make(chan *WebConn),
-	connections:    make(map[*WebConn]bool),
-	broadcast:      make(chan *model.Message),
-	stop:           make(chan string),
-	invalidateUser: make(chan string),
+	register:          make(chan *WebConn),
+	unregister:        make(chan *WebConn),
+	connections:       make(map[*WebConn]bool),
+	broadcast:         make(chan *model.Message),
+	stop:              make(chan string),
+	invalidateUser:    make(chan string),
+	invalidateChannel: make(chan string),
 }
 
 func PublishAndForget(message *model.Message) {
@@ -37,6 +39,10 @@ func InvalidateCacheForUser(userId string) {
 	hub.invalidateUser <- userId
 }
 
+func InvalidateCacheForChannel(channelId string) {
+	hub.invalidateChannel <- channelId
+}
+
 func (h *Hub) Register(webConn *WebConn) {
 	h.register <- webConn
 }
@@ -74,6 +80,11 @@ func (h *Hub) Start() {
 					}
 				}
 
+			case channelId := <-h.invalidateChannel:
+				for webCon := range h.connections {
+					webCon.InvalidateCacheForChannel(channelId)
+				}
+
 			case msg := <-h.broadcast:
 				for webCon := range h.connections {
 					if shouldSendEvent(webCon, msg) {
@@ -136,8 +147,8 @@ func shouldSendEvent(webCon *WebConn, msg *model.Message) bool {
 			}
 		}
 
-		// Only report events to users who are in the channel for the event
-		if len(msg.ChannelId) > 0 {
+		// Only report events to users who are in the channel for the event execept deleted events
+		if len(msg.ChannelId) > 0 && msg.Action != model.ACTION_CHANNEL_DELETED {
 			allowed := webCon.HasPermissionsToChannel(msg.ChannelId)
 
 			if !allowed {

model/message.go

@@ -13,6 +13,7 @@ const (
 	ACTION_POSTED             = "posted"
 	ACTION_POST_EDITED        = "post_edited"
 	ACTION_POST_DELETED       = "post_deleted"
+	ACTION_CHANNEL_DELETED    = "channel_deleted"
 	ACTION_CHANNEL_VIEWED     = "channel_viewed"
 	ACTION_NEW_USER           = "new_user"
 	ACTION_USER_ADDED         = "user_added"

model/post.go

@@ -16,6 +16,7 @@ const (
 	POST_SYSTEM_GENERIC        = "system_generic"
 	POST_JOIN_LEAVE            = "system_join_leave"
 	POST_HEADER_CHANGE         = "system_header_change"
+	POST_CHANNEL_DELETED       = "system_channel_deleted"
 	POST_EPHEMERAL             = "system_ephemeral"
 )
 

webapp/action_creators/websocket_actions.jsx

@@ -18,6 +18,8 @@ import * as GlobalActions from 'action_creators/global_actions.jsx';
 import Constants from 'utils/constants.jsx';
 const SocketEvents = Constants.SocketEvents;
 
+import {browserHistory} from 'react-router';
+
 const MAX_WEBSOCKET_FAILS = 7;
 const WEBSOCKET_RETRY_TIME = 3000;
 
@@ -135,6 +137,10 @@ function handleMessage(msg) {
         handleChannelViewedEvent(msg);
         break;
 
+    case SocketEvents.CHANNEL_DELETED:
+        handleChannelDeletedEvent(msg);
+        break;
+
     case SocketEvents.PREFERENCE_CHANGED:
         handlePreferenceChangedEvent(msg);
         break;
@@ -234,6 +240,15 @@ function handleChannelViewedEvent(msg) {
     }
 }
 
+function handleChannelDeletedEvent(msg) {
+    if (ChannelStore.getCurrentId() === msg.channel_id) {
+        const teamUrl = TeamStore.getCurrentTeamRelativeUrl();
+        browserHistory.push(teamUrl + '/channels/' + Constants.DEFAULT_CHANNEL);
+    } else {
+        AsyncClient.getChannels();
+    }
+}
+
 function handlePreferenceChangedEvent(msg) {
     const preference = JSON.parse(msg.props.preference);
     GlobalActions.emitPreferenceChangedEvent(preference);

webapp/stores/team_store.jsx

@@ -20,19 +20,6 @@ function getWindowLocationOrigin() {
 class TeamStoreClass extends EventEmitter {
     constructor() {
         super();
-
-        this.emitChange = this.emitChange.bind(this);
-        this.addChangeListener = this.addChangeListener.bind(this);
-        this.removeChangeListener = this.removeChangeListener.bind(this);
-        this.get = this.get.bind(this);
-        this.getByName = this.getByName.bind(this);
-        this.getAll = this.getAll.bind(this);
-        this.getCurrentId = this.getCurrentId.bind(this);
-        this.getCurrent = this.getCurrent.bind(this);
-        this.getCurrentTeamUrl = this.getCurrentTeamUrl.bind(this);
-        this.getCurrentInviteLink = this.getCurrentInviteLink.bind(this);
-        this.saveTeam = this.saveTeam.bind(this);
-
         this.clear();
     }
 
@@ -104,6 +91,13 @@ class TeamStoreClass extends EventEmitter {
         return null;
     }
 
+    getCurrentTeamRelativeUrl() {
+        if (this.getCurrent()) {
+            return '/' + this.getCurrent().name;
+        }
+        return null;
+    }
+
     getCurrentInviteLink() {
         const current = this.getCurrent();
 

webapp/utils/constants.jsx

@@ -147,6 +147,7 @@ export default {
         POSTED: 'posted',
         POST_EDITED: 'post_edited',
         POST_DELETED: 'post_deleted',
+        CHANNEL_DELETED: 'channel_deleted',
         CHANNEL_VIEWED: 'channel_viewed',
         NEW_USER: 'new_user',
         USER_ADDED: 'user_added',