Remove global cfg vars (#8099)

* remove global cfg vars

* enterprise update

app/config.go

@@ -16,29 +16,59 @@ import (
 )
 
 func (a *App) Config() *model.Config {
-	return utils.Cfg
+	if cfg := a.config.Load(); cfg != nil {
+		return cfg.(*model.Config)
+	}
+	return &model.Config{}
 }
 
 func (a *App) UpdateConfig(f func(*model.Config)) {
-	old := utils.Cfg.Clone()
-	f(utils.Cfg)
-	utils.InvokeGlobalConfigListeners(old, utils.Cfg)
+	old := a.Config()
+	updated := old.Clone()
+	f(updated)
+	a.config.Store(updated)
+	utils.Cfg = updated
+	a.InvokeConfigListeners(old, updated)
 }
 
 func (a *App) PersistConfig() {
 	utils.SaveConfig(a.ConfigFileName(), a.Config())
 }
 
-func (a *App) ReloadConfig() {
+func (a *App) LoadConfig(configFile string) *model.AppError {
+	old := a.Config()
+
+	cfg, configPath, err := utils.LoadConfig(configFile)
+	if err != nil {
+		return err
+	}
+
+	a.configFile = configPath
+
+	utils.ConfigureLog(&cfg.LogSettings)
+
+	a.config.Store(cfg)
+	utils.Cfg = cfg
+
+	utils.SetSiteURL(*cfg.ServiceSettings.SiteURL)
+
+	a.InvokeConfigListeners(old, cfg)
+	return nil
+}
+
+func (a *App) ReloadConfig() *model.AppError {
 	debug.FreeOSMemory()
-	utils.LoadGlobalConfig(a.ConfigFileName())
+	if err := a.LoadConfig(a.configFile); err != nil {
+		return err
+	}
 
 	// start/restart email batching job if necessary
 	a.InitEmailBatching()
+	return nil
 }
 
 func (a *App) ConfigFileName() string {
-	return utils.CfgFileName
+	return a.configFile
 }
 
 func (a *App) ClientConfig() map[string]string {
@@ -51,7 +81,9 @@ func (a *App) ClientConfigHash() string {
 
 func (a *App) EnableConfigWatch() {
 	if a.configWatcher == nil && !a.disableConfigWatch {
-		configWatcher, err := utils.NewConfigWatcher(utils.CfgFileName)
+		configWatcher, err := utils.NewConfigWatcher(a.ConfigFileName(), func() {
+			a.ReloadConfig()
+		})
 		if err != nil {
 			l4g.Error(err)
 		}
@@ -66,8 +98,73 @@ func (a *App) DisableConfigWatch() {
 	}
 }
 
+// Registers a function with a given to be called when the config is reloaded and may have changed. The function
+// will be called with two arguments: the old config and the new config. AddConfigListener returns a unique ID
+// for the listener that can later be used to remove it.
+func (a *App) AddConfigListener(listener func(*model.Config, *model.Config)) string {
+	id := model.NewId()
+	a.configListeners[id] = listener
+	return id
+}
+
+// Removes a listener function by the unique ID returned when AddConfigListener was called
+func (a *App) RemoveConfigListener(id string) {
+	delete(a.configListeners, id)
+}
+
+func (a *App) InvokeConfigListeners(old, current *model.Config) {
+	for _, listener := range a.configListeners {
+		listener(old, current)
+	}
+}
+
 func (a *App) regenerateClientConfig() {
 	a.clientConfig = utils.GenerateClientConfig(a.Config(), a.DiagnosticId())
 	clientConfigJSON, _ := json.Marshal(a.clientConfig)
 	a.clientConfigHash = fmt.Sprintf("%x", md5.Sum(clientConfigJSON))
 }
+
+func (a *App) Desanitize(cfg *model.Config) {
+	actual := a.Config()
+
+	if cfg.LdapSettings.BindPassword != nil && *cfg.LdapSettings.BindPassword == model.FAKE_SETTING {
+		*cfg.LdapSettings.BindPassword = *actual.LdapSettings.BindPassword
+	}
+
+	if *cfg.FileSettings.PublicLinkSalt == model.FAKE_SETTING {
+		*cfg.FileSettings.PublicLinkSalt = *actual.FileSettings.PublicLinkSalt
+	}
+	if cfg.FileSettings.AmazonS3SecretAccessKey == model.FAKE_SETTING {
+		cfg.FileSettings.AmazonS3SecretAccessKey = actual.FileSettings.AmazonS3SecretAccessKey
+	}
+
+	if cfg.EmailSettings.InviteSalt == model.FAKE_SETTING {
+		cfg.EmailSettings.InviteSalt = actual.EmailSettings.InviteSalt
+	}
+	if cfg.EmailSettings.SMTPPassword == model.FAKE_SETTING {
+		cfg.EmailSettings.SMTPPassword = actual.EmailSettings.SMTPPassword
+	}
+
+	if cfg.GitLabSettings.Secret == model.FAKE_SETTING {
+		cfg.GitLabSettings.Secret = actual.GitLabSettings.Secret
+	}
+
+	if *cfg.SqlSettings.DataSource == model.FAKE_SETTING {
+		*cfg.SqlSettings.DataSource = *actual.SqlSettings.DataSource
+	}
+	if cfg.SqlSettings.AtRestEncryptKey == model.FAKE_SETTING {
+		cfg.SqlSettings.AtRestEncryptKey = actual.SqlSettings.AtRestEncryptKey
+	}
+
+	if *cfg.ElasticsearchSettings.Password == model.FAKE_SETTING {
+		*cfg.ElasticsearchSettings.Password = *actual.ElasticsearchSettings.Password
+	}
+
+	for i := range cfg.SqlSettings.DataSourceReplicas {
+		cfg.SqlSettings.DataSourceReplicas[i] = actual.SqlSettings.DataSourceReplicas[i]
+	}
+
+	for i := range cfg.SqlSettings.DataSourceSearchReplicas {
+		cfg.SqlSettings.DataSourceSearchReplicas[i] = actual.SqlSettings.DataSourceSearchReplicas[i]
+	}
+}