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Allow dev i18n to be more concurrent (#20159)

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The recent changes to add live-reloading to the i18n translation files made the i18n code totally non-concurrent when using dev. This will make discovering other concurrency related issues far more difficult. This PR fixes these, adds some more comments to the code and slightly restructures a few functions.

Signed-off-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
zeripath
2022-07-04 11:17:09 +01:00
committed by GitHub
parent 33f6f91008
commit ba0f9274e9
1 changed files with 169 additions and 75 deletions
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216
modules/translation/i18n/i18n.go
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@@ -25,9 +25,13 @@ var (
)
type locale struct {
// This mutex will be set if we have live-reload enabled (e.g. dev mode)
reloadMu *sync.RWMutex
store *LocaleStore
langName string
textMap map[int]string // the map key (idx) is generated by store's textIdxMap
idxToMsgMap map[int]string // the map idx is generated by store's trKeyToIdxMap
sourceFileName string
sourceFileInfo os.FileInfo
@@ -35,147 +39,238 @@ type locale struct {
}
type LocaleStore struct {
reloadMu *sync.Mutex // for non-prod(dev), use a mutex for live-reload. for prod, no mutex, no live-reload.
// This mutex will be set if we have live-reload enabled (e.g. dev mode)
reloadMu *sync.RWMutex
langNames []string
langDescs []string
localeMap map[string]*locale
textIdxMap map[string]int
// this needs to be locked when live-reloading
trKeyToIdxMap map[string]int
defaultLang string
}
func NewLocaleStore(isProd bool) *LocaleStore {
ls := &LocaleStore{localeMap: make(map[string]*locale), textIdxMap: make(map[string]int)}
store := &LocaleStore{localeMap: make(map[string]*locale), trKeyToIdxMap: make(map[string]int)}
if !isProd {
ls.reloadMu = &sync.Mutex{}
store.reloadMu = &sync.RWMutex{}
}
return ls
return store
}
// AddLocaleByIni adds locale by ini into the store
// if source is a string, then the file is loaded. in dev mode, the file can be live-reloaded
// if source is a string, then the file is loaded. In dev mode, this file will be checked for live-reloading
// if source is a []byte, then the content is used
func (ls *LocaleStore) AddLocaleByIni(langName, langDesc string, source interface{}) error {
if _, ok := ls.localeMap[langName]; ok {
// Note: this is not concurrent safe
func (store *LocaleStore) AddLocaleByIni(langName, langDesc string, source interface{}) error {
if _, ok := store.localeMap[langName]; ok {
return ErrLocaleAlreadyExist
}
lc := &locale{store: ls, langName: langName}
l := &locale{store: store, langName: langName}
if store.reloadMu != nil {
l.reloadMu = &sync.RWMutex{}
l.reloadMu.Lock() // Arguably this is not necessary as AddLocaleByIni isn't concurrent safe - but for consistency we do this
defer l.reloadMu.Unlock()
}
if fileName, ok := source.(string); ok {
lc.sourceFileName = fileName
lc.sourceFileInfo, _ = os.Stat(fileName) // live-reload only works for regular files. the error can be ignored
l.sourceFileName = fileName
l.sourceFileInfo, _ = os.Stat(fileName) // live-reload only works for regular files. the error can be ignored
}
ls.langNames = append(ls.langNames, langName)
ls.langDescs = append(ls.langDescs, langDesc)
ls.localeMap[lc.langName] = lc
return ls.reloadLocaleByIni(langName, source)
var err error
l.idxToMsgMap, err = store.readIniToIdxToMsgMap(source)
if err != nil {
return err
}
func (ls *LocaleStore) reloadLocaleByIni(langName string, source interface{}) error {
store.langNames = append(store.langNames, langName)
store.langDescs = append(store.langDescs, langDesc)
store.localeMap[l.langName] = l
return nil
}
// readIniToIdxToMsgMap will read a provided ini and creates an idxToMsgMap
func (store *LocaleStore) readIniToIdxToMsgMap(source interface{}) (map[int]string, error) {
iniFile, err := ini.LoadSources(ini.LoadOptions{
IgnoreInlineComment: true,
UnescapeValueCommentSymbols: true,
}, source)
if err != nil {
return fmt.Errorf("unable to load ini: %w", err)
return nil, fmt.Errorf("unable to load ini: %w", err)
}
iniFile.BlockMode = false
lc := ls.localeMap[langName]
lc.textMap = make(map[int]string)
idxToMsgMap := make(map[int]string)
if store.reloadMu != nil {
store.reloadMu.Lock()
defer store.reloadMu.Unlock()
}
for _, section := range iniFile.Sections() {
for _, key := range section.Keys() {
var trKey string
if section.Name() == "" || section.Name() == "DEFAULT" {
trKey = key.Name()
} else {
trKey = section.Name() + "." + key.Name()
}
textIdx, ok := ls.textIdxMap[trKey]
// Instead of storing the key strings in multiple different maps we compute a idx which will act as numeric code for key
// This reduces the size of the locale idxToMsgMaps
idx, ok := store.trKeyToIdxMap[trKey]
if !ok {
textIdx = len(ls.textIdxMap)
ls.textIdxMap[trKey] = textIdx
idx = len(store.trKeyToIdxMap)
store.trKeyToIdxMap[trKey] = idx
}
lc.textMap[textIdx] = key.Value()
idxToMsgMap[idx] = key.Value()
}
}
iniFile = nil
return nil
return idxToMsgMap, nil
}
func (ls *LocaleStore) HasLang(langName string) bool {
_, ok := ls.localeMap[langName]
func (store *LocaleStore) idxForTrKey(trKey string) (int, bool) {
if store.reloadMu != nil {
store.reloadMu.RLock()
defer store.reloadMu.RUnlock()
}
idx, ok := store.trKeyToIdxMap[trKey]
return idx, ok
}
// HasLang reports if a language is available in the store
func (store *LocaleStore) HasLang(langName string) bool {
_, ok := store.localeMap[langName]
return ok
}
func (ls *LocaleStore) ListLangNameDesc() (names, desc []string) {
return ls.langNames, ls.langDescs
// ListLangNameDesc reports if a language available in the store
func (store *LocaleStore) ListLangNameDesc() (names, desc []string) {
return store.langNames, store.langDescs
}
// SetDefaultLang sets default language as a fallback
func (ls *LocaleStore) SetDefaultLang(lang string) {
ls.defaultLang = lang
func (store *LocaleStore) SetDefaultLang(lang string) {
store.defaultLang = lang
}
// Tr translates content to target language. fall back to default language.
func (ls *LocaleStore) Tr(lang, trKey string, trArgs ...interface{}) string {
l, ok := ls.localeMap[lang]
func (store *LocaleStore) Tr(lang, trKey string, trArgs ...interface{}) string {
l, ok := store.localeMap[lang]
if !ok {
l, ok = ls.localeMap[ls.defaultLang]
l, ok = store.localeMap[store.defaultLang]
}
if ok {
return l.Tr(trKey, trArgs...)
}
return trKey
}
// reloadIfNeeded will check if the locale needs to be reloaded
// this function will assume that the l.reloadMu has been RLocked if it already exists
func (l *locale) reloadIfNeeded() {
if l.reloadMu == nil {
return
}
now := time.Now()
if now.Sub(l.lastReloadCheckTime) < time.Second || l.sourceFileInfo == nil || l.sourceFileName == "" {
return
}
l.reloadMu.RUnlock()
l.reloadMu.Lock() // (NOTE: a pre-emption can occur between these two locks so we need to recheck)
defer l.reloadMu.RLock()
defer l.reloadMu.Unlock()
if now.Sub(l.lastReloadCheckTime) < time.Second || l.sourceFileInfo == nil || l.sourceFileName == "" {
return
}
l.lastReloadCheckTime = now
sourceFileInfo, err := os.Stat(l.sourceFileName)
if err != nil || sourceFileInfo.ModTime().Equal(l.sourceFileInfo.ModTime()) {
return
}
idxToMsgMap, err := l.store.readIniToIdxToMsgMap(l.sourceFileName)
if err == nil {
l.idxToMsgMap = idxToMsgMap
} else {
log.Error("Unable to live-reload the locale file %q, err: %v", l.sourceFileName, err)
}
// We will set the sourceFileInfo to this file to prevent repeated attempts to re-load this broken file
l.sourceFileInfo = sourceFileInfo
}
// Tr translates content to locale language. fall back to default language.
func (l *locale) Tr(trKey string, trArgs ...interface{}) string {
if l.store.reloadMu != nil {
l.store.reloadMu.Lock()
defer l.store.reloadMu.Unlock()
now := time.Now()
if now.Sub(l.lastReloadCheckTime) >= time.Second && l.sourceFileInfo != nil && l.sourceFileName != "" {
l.lastReloadCheckTime = now
if sourceFileInfo, err := os.Stat(l.sourceFileName); err == nil && !sourceFileInfo.ModTime().Equal(l.sourceFileInfo.ModTime()) {
if err = l.store.reloadLocaleByIni(l.langName, l.sourceFileName); err == nil {
l.sourceFileInfo = sourceFileInfo
} else {
log.Error("unable to live-reload the locale file %q, err: %v", l.sourceFileName, err)
}
}
}
if l.reloadMu != nil {
l.reloadMu.RLock()
defer l.reloadMu.RUnlock()
l.reloadIfNeeded()
}
msg, _ := l.tryTr(trKey, trArgs...)
return msg
}
func (l *locale) tryTr(trKey string, trArgs ...interface{}) (msg string, found bool) {
trMsg := trKey
textIdx, ok := l.store.textIdxMap[trKey]
// convert the provided trKey to a common idx from the store
idx, ok := l.store.idxForTrKey(trKey)
if ok {
if msg, found = l.textMap[textIdx]; found {
trMsg = msg // use current translation
if msg, found = l.idxToMsgMap[idx]; found {
trMsg = msg // use the translation that we have found
} else if l.langName != l.store.defaultLang {
// No translation available in our current language... fallback to the default language
// Attempt to get the default language from the locale store
if def, ok := l.store.localeMap[l.store.defaultLang]; ok {
return def.tryTr(trKey, trArgs...)
if def.reloadMu != nil {
def.reloadMu.RLock()
def.reloadIfNeeded()
}
if msg, found = def.idxToMsgMap[idx]; found {
trMsg = msg // use the translation that we have found
}
if def.reloadMu != nil {
def.reloadMu.RUnlock()
}
}
} else if !setting.IsProd {
log.Error("missing i18n translation key: %q", trKey)
}
}
if len(trArgs) > 0 {
if !found && !setting.IsProd {
log.Error("missing i18n translation key: %q", trKey)
}
if len(trArgs) == 0 {
return trMsg, found
}
fmtArgs := make([]interface{}, 0, len(trArgs))
for _, arg := range trArgs {
val := reflect.ValueOf(arg)
if val.Kind() == reflect.Slice {
// before, it can accept Tr(lang, key, a, [b, c], d, [e, f]) as Sprintf(msg, a, b, c, d, e, f), it's an unstable behavior
// now, we restrict the strange behavior and only support:
// Previously, we would accept Tr(lang, key, a, [b, c], d, [e, f]) as Sprintf(msg, a, b, c, d, e, f)
// but this is an unstable behavior.
//
// So we restrict the accepted arguments to either:
//
// 1. Tr(lang, key, [slice-items]) as Sprintf(msg, items...)
// 2. Tr(lang, key, args...) as Sprintf(msg, args...)
if len(trArgs) == 1 {
@@ -190,10 +285,9 @@ func (l *locale) tryTr(trKey string, trArgs ...interface{}) (msg string, found b
fmtArgs = append(fmtArgs, arg)
}
}
return fmt.Sprintf(trMsg, fmtArgs...), found
}
return trMsg, found
}
// ResetDefaultLocales resets the current default locales
// NOTE: this is not synchronized