Migrate to stateless app.App (#17542)

* add request context

* move initialialization to server

* use app interface instead of global app functions

* remove app context from webconn

* cleanup

* remove duplicated services

* move context to separate package

* remove finalize init method and move content to NewServer function

* restart workers and schedulers after adding license for tests

* reflect review comments

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

api4/websocket.go

@@ -40,21 +40,21 @@ func connectWebSocket(c *Context, w http.ResponseWriter, r *http.Request) {
 	// If the queues are empty, they are initialized in the constructor.
 	cfg := &app.WebConnConfig{
 		WebSocket: ws,
-		Session:   *c.App.Session(),
-		TFunc:     c.App.T,
+		Session:   *c.AppContext.Session(),
+		TFunc:     c.AppContext.T,
 		Locale:    "",
 		Active:    true,
 	}
 
 	if *c.App.Config().ServiceSettings.EnableReliableWebSockets {
 		cfg.ConnectionID = r.URL.Query().Get(connectionIDParam)
-		if cfg.ConnectionID == "" || c.App.Session().UserId == "" {
+		if cfg.ConnectionID == "" || c.AppContext.Session().UserId == "" {
 			// If not present, we assume client is not capable yet, or it's a fresh connection.
 			// We just create a new ID.
 			cfg.ConnectionID = model.NewId()
 			// In case of fresh connection id, sequence number is already zero.
 		} else {
-			cfg, err = c.App.PopulateWebConnConfig(cfg, r.URL.Query().Get(sequenceNumberParam))
+			cfg, err = c.App.PopulateWebConnConfig(c.AppContext.Session(), cfg, r.URL.Query().Get(sequenceNumberParam))
 			if err != nil {
 				mlog.Warn("Error while populating webconn config", mlog.String("id", r.URL.Query().Get(connectionIDParam)), mlog.Err(err))
 				ws.Close()
@@ -64,7 +64,7 @@ func connectWebSocket(c *Context, w http.ResponseWriter, r *http.Request) {
 	}
 
 	wc := c.App.NewWebConn(cfg)
-	if c.App.Session().UserId != "" {
+	if c.AppContext.Session().UserId != "" {
 		c.App.HubRegister(wc)
 	}