Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/app/web_hub.go

@@ -0,0 +1,69 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package app
+
+import (
+	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/server/channels/app/platform"
+)
+
+func (a *App) TotalWebsocketConnections() int {
+	return a.Srv().Platform().TotalWebsocketConnections()
+}
+
+func (a *App) GetHubForUserId(userID string) *platform.Hub {
+	return a.Srv().Platform().GetHubForUserId(userID)
+}
+
+// HubRegister registers a connection to a hub.
+func (a *App) HubRegister(webConn *platform.WebConn) {
+	a.Srv().Platform().HubRegister(webConn)
+}
+
+// HubUnregister unregisters a connection from a hub.
+func (a *App) HubUnregister(webConn *platform.WebConn) {
+	a.Srv().Platform().HubUnregister(webConn)
+}
+
+func (a *App) Publish(message *model.WebSocketEvent) {
+	a.Srv().Platform().Publish(message)
+}
+
+func (ch *Channels) Publish(message *model.WebSocketEvent) {
+	ch.srv.Platform().Publish(message)
+}
+
+func (a *App) invalidateCacheForChannelMembers(channelID string) {
+	a.Srv().Platform().InvalidateCacheForChannelMembers(channelID)
+}
+
+func (a *App) invalidateCacheForChannelMembersNotifyProps(channelID string) {
+	a.Srv().Platform().InvalidateCacheForChannelMembersNotifyProps(channelID)
+}
+
+func (a *App) invalidateCacheForChannelPosts(channelID string) {
+	a.Srv().Platform().InvalidateCacheForChannelPosts(channelID)
+}
+
+func (a *App) InvalidateCacheForUser(userID string) {
+	a.Srv().Platform().InvalidateCacheForUser(userID)
+}
+
+func (a *App) invalidateCacheForUserTeams(userID string) {
+	a.Srv().Platform().InvalidateCacheForUserTeams(userID)
+}
+
+// UpdateWebConnUserActivity sets the LastUserActivityAt of the hub for the given session.
+func (a *App) UpdateWebConnUserActivity(session model.Session, activityAt int64) {
+	a.Srv().Platform().UpdateWebConnUserActivity(session, activityAt)
+}
+
+// SessionIsRegistered determines if a specific session has been registered
+func (a *App) SessionIsRegistered(session model.Session) bool {
+	return a.Srv().Platform().SessionIsRegistered(session)
+}
+
+func (a *App) CheckWebConn(userID, connectionID string) *platform.CheckConnResult {
+	return a.Srv().Platform().CheckWebConn(userID, connectionID)
+}