PLT-6471 Properly panic when translations can't be loaded (#6414)

* PLT-6471 Properly panic when translations can't be loaded

* Print usage messages when errors occur during CLI initialization

* Reverted behaviour of FindDir and added second return value to it

* Fixed merge conflict

utils/config.go

@@ -78,17 +78,21 @@ func FindConfigFile(fileName string) string {
 	return fileName
 }
 
-func FindDir(dir string) string {
+func FindDir(dir string) (string, bool) {
 	fileName := "."
+	found := false
 	if _, err := os.Stat("./" + dir + "/"); err == nil {
 		fileName, _ = filepath.Abs("./" + dir + "/")
+		found = true
 	} else if _, err := os.Stat("../" + dir + "/"); err == nil {
 		fileName, _ = filepath.Abs("../" + dir + "/")
+		found = true
 	} else if _, err := os.Stat("../../" + dir + "/"); err == nil {
 		fileName, _ = filepath.Abs("../../" + dir + "/")
+		found = true
 	}
 
-	return fileName + "/"
+	return fileName + "/", found
 }
 
 func DisableDebugLogForTest() {
@@ -161,7 +165,8 @@ func configureLog(s *model.LogSettings) {
 
 func GetLogFileLocation(fileLocation string) string {
 	if fileLocation == "" {
-		return FindDir("logs") + LOG_FILENAME
+		logDir, _ := FindDir("logs")
+		return logDir + LOG_FILENAME
 	} else {
 		return fileLocation + LOG_FILENAME
 	}
@@ -258,19 +263,17 @@ func DisableConfigWatch() {
 	}
 }
 
-func InitAndLoadConfig(filename string) (err string) {
-	defer func() {
-		if r := recover(); r != nil {
-			err = fmt.Sprintf("%v", r)
-		}
-	}()
-	TranslationsPreInit()
+func InitAndLoadConfig(filename string) error {
+	if err := TranslationsPreInit(); err != nil {
+		return err
+	}
+
 	EnableConfigFromEnviromentVars()
 	LoadConfig(filename)
 	InitializeConfigWatch()
 	EnableConfigWatch()
 
-	return ""
+	return nil
 }
 
 // LoadConfig will try to search around for the corresponding config file.

utils/html.go

@@ -33,7 +33,7 @@ func InitHTMLWithDir(dir string) {
 		return
 	}
 
-	templatesDir := FindDir(dir)
+	templatesDir, _ := FindDir(dir)
 	l4g.Debug(T("api.api.init.parsing_templates.debug"), templatesDir)
 	var err error
 	if htmlTemplates, err = template.ParseGlob(templatesDir + "*.html"); err != nil {

utils/i18n.go

@@ -1,6 +1,7 @@
 package utils
 
 import (
+	"fmt"
 	"io/ioutil"
 	"net/http"
 	"path/filepath"
@@ -18,30 +19,47 @@ var settings model.LocalizationSettings
 
 // this functions loads translations from filesystem
 // and assign english while loading server config
-func TranslationsPreInit() {
-	InitTranslationsWithDir("i18n")
+func TranslationsPreInit() error {
+	if err := InitTranslationsWithDir("i18n"); err != nil {
+		return err
+	}
+
 	T = TfuncWithFallback("en")
 	TDefault = TfuncWithFallback("en")
+
+	return nil
 }
 
-func InitTranslations(localizationSettings model.LocalizationSettings) {
+func InitTranslations(localizationSettings model.LocalizationSettings) error {
 	settings = localizationSettings
-	T = GetTranslationsBySystemLocale()
+
+	var err error
+	T, err = GetTranslationsBySystemLocale()
+	return err
 }
 
-func InitTranslationsWithDir(dir string) {
-	i18nDirectory := FindDir(dir)
+func InitTranslationsWithDir(dir string) error {
+	i18nDirectory, found := FindDir(dir)
+	if !found {
+		return fmt.Errorf("Unable to find i18n directory")
+	}
+
 	files, _ := ioutil.ReadDir(i18nDirectory)
 	for _, f := range files {
 		if filepath.Ext(f.Name()) == ".json" {
 			filename := f.Name()
 			locales[strings.Split(filename, ".")[0]] = i18nDirectory + filename
-			i18n.MustLoadTranslationFile(i18nDirectory + filename)
+
+			if err := i18n.LoadTranslationFile(i18nDirectory + filename); err != nil {
+				return err
+			}
 		}
 	}
+
+	return nil
 }
 
-func GetTranslationsBySystemLocale() i18n.TranslateFunc {
+func GetTranslationsBySystemLocale() (i18n.TranslateFunc, error) {
 	locale := *settings.DefaultServerLocale
 	if _, ok := locales[locale]; !ok {
 		l4g.Error("Failed to load system translations for '%v' attempting to fall back to '%v'", locale, model.DEFAULT_LOCALE)
@@ -49,16 +67,16 @@ func GetTranslationsBySystemLocale() i18n.TranslateFunc {
 	}
 
 	if locales[locale] == "" {
-		panic("Failed to load system translations for '" + model.DEFAULT_LOCALE + "'")
+		return nil, fmt.Errorf("Failed to load system translations for '%v'", model.DEFAULT_LOCALE)
 	}
 
 	translations := TfuncWithFallback(locale)
 	if translations == nil {
-		panic("Failed to load system translations")
+		return nil, fmt.Errorf("Failed to load system translations")
 	}
 
 	l4g.Info(translations("utils.i18n.loaded"), locale, locales[locale])
-	return translations
+	return translations, nil
 }
 
 func GetUserTranslations(locale string) i18n.TranslateFunc {

utils/license.go

@@ -152,7 +152,8 @@ func GetLicenseFileFromDisk(fileName string) []byte {
 
 func GetLicenseFileLocation(fileLocation string) string {
 	if fileLocation == "" {
-		return FindDir("config") + "mattermost.mattermost-license"
+		configDir, _ := FindDir("config")
+		return configDir + "mattermost.mattermost-license"
 	} else {
 		return fileLocation
 	}