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/api4/websocket_norace_test.go

@@ -0,0 +1,65 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+//go:build !race
+// +build !race
+
+package api4
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/mattermost/mattermost-server/v6/model"
+)
+
+// TestWebSocket is intentionally made to skip -race mode
+// because the websocket client is known to be racy and needs a big overhaul
+// to fix everything.
+func TestWebSocket(t *testing.T) {
+	th := Setup(t).InitBasic()
+	defer th.TearDown()
+	WebSocketClient, err := th.CreateWebSocketClient()
+	require.NoError(t, err)
+	defer WebSocketClient.Close()
+
+	time.Sleep(300 * time.Millisecond)
+
+	// Test closing and reconnecting
+	WebSocketClient.Close()
+	appErr := WebSocketClient.Connect()
+	require.Nil(t, appErr)
+
+	WebSocketClient.Listen()
+
+	resp := <-WebSocketClient.ResponseChannel
+	require.Equal(t, resp.Status, model.StatusOk, "should have responded OK to authentication challenge")
+
+	WebSocketClient.SendMessage("ping", nil)
+	resp = <-WebSocketClient.ResponseChannel
+	require.Equal(t, resp.Data["text"].(string), "pong", "wrong response")
+
+	WebSocketClient.SendMessage("", nil)
+	resp = <-WebSocketClient.ResponseChannel
+	require.Equal(t, resp.Error.Id, "api.web_socket_router.no_action.app_error", "should have been no action response")
+
+	WebSocketClient.SendMessage("junk", nil)
+	resp = <-WebSocketClient.ResponseChannel
+	require.Equal(t, resp.Error.Id, "api.web_socket_router.bad_action.app_error", "should have been bad action response")
+
+	WebSocketClient.UserTyping("", "")
+	resp = <-WebSocketClient.ResponseChannel
+	require.Equal(t, resp.Error.Id, "api.websocket_handler.invalid_param.app_error", "should have been invalid param response")
+	require.Equal(t, resp.Error.DetailedError, "", "detailed error not cleared")
+
+	WebSocketClient.UserTyping(th.BasicChannel.Id, "")
+	resp = <-WebSocketClient.ResponseChannel
+	require.Nil(t, resp.Error)
+
+	WebSocketClient.UserTyping(th.BasicPrivateChannel2.Id, "")
+	resp = <-WebSocketClient.ResponseChannel
+	require.Equal(t, resp.Error.Id, "api.websocket_handler.invalid_param.app_error", "should have been invalid param response")
+	require.Equal(t, resp.Error.DetailedError, "", "detailed error not cleared")
+}