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>

app/upload.go

@@ -12,6 +12,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/mattermost/mattermost-server/v5/app/request"
 	"github.com/mattermost/mattermost-server/v5/model"
 	"github.com/mattermost/mattermost-server/v5/plugin"
 	"github.com/mattermost/mattermost-server/v5/shared/mlog"
@@ -21,7 +22,7 @@ import (
 const minFirstPartSize = 5 * 1024 * 1024 // 5MB
 const IncompleteUploadSuffix = ".tmp"
 
-func (a *App) runPluginsHook(info *model.FileInfo, file io.Reader) *model.AppError {
+func (a *App) runPluginsHook(c *request.Context, info *model.FileInfo, file io.Reader) *model.AppError {
 	pluginsEnvironment := a.GetPluginsEnvironment()
 	if pluginsEnvironment == nil {
 		return nil
@@ -39,7 +40,7 @@ func (a *App) runPluginsHook(info *model.FileInfo, file io.Reader) *model.AppErr
 		defer close(errChan)
 		var rejErr *model.AppError
 		var once sync.Once
-		pluginContext := a.PluginContext()
+		pluginContext := pluginContext(c)
 		pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
 			once.Do(func() {
 				hookHasRunCh <- struct{}{}
@@ -162,7 +163,7 @@ func (a *App) GetUploadSessionsForUser(userID string) ([]*model.UploadSession, *
 	return uss, nil
 }
 
-func (a *App) UploadData(us *model.UploadSession, rd io.Reader) (*model.FileInfo, *model.AppError) {
+func (a *App) UploadData(c *request.Context, us *model.UploadSession, rd io.Reader) (*model.FileInfo, *model.AppError) {
 	// prevent more than one caller to upload data at the same time for a given upload session.
 	// This is to avoid possible inconsistencies.
 	a.Srv().uploadLockMapMut.Lock()
@@ -258,7 +259,7 @@ func (a *App) UploadData(us *model.UploadSession, rd io.Reader) (*model.FileInfo
 	}
 
 	// run plugins upload hook
-	if err := a.runPluginsHook(info, file); err != nil {
+	if err := a.runPluginsHook(c, info, file); err != nil {
 		return nil, err
 	}