Fix context cache bug & enable context cache for dashabord commits' authors (#26991)

Unfortunately, when a system setting hasn't been stored in the database,
it cannot be cached.
Meanwhile, this PR also uses context cache for push email avatar display
which should avoid to read user table via email address again and again.

According to my local test, this should reduce dashboard elapsed time
from 150ms -> 80ms .

models/avatars/avatar.go

@@ -153,7 +153,12 @@ func generateEmailAvatarLink(ctx context.Context, email string, size int, final
 		return DefaultAvatarLink()
 	}
 
-	enableFederatedAvatar := system_model.GetSettingWithCacheBool(ctx, system_model.KeyPictureEnableFederatedAvatar)
+	disableGravatar := system_model.GetSettingWithCacheBool(ctx, system_model.KeyPictureDisableGravatar,
+		setting.GetDefaultDisableGravatar(),
+	)
+
+	enableFederatedAvatar := system_model.GetSettingWithCacheBool(ctx, system_model.KeyPictureEnableFederatedAvatar,
+		setting.GetDefaultEnableFederatedAvatar(disableGravatar))
 
 	var err error
 	if enableFederatedAvatar && system_model.LibravatarService != nil {
@@ -174,7 +179,6 @@ func generateEmailAvatarLink(ctx context.Context, email string, size int, final
 		return urlStr
 	}
 
-	disableGravatar := system_model.GetSettingWithCacheBool(ctx, system_model.KeyPictureDisableGravatar)
 	if !disableGravatar {
 		// copy GravatarSourceURL, because we will modify its Path.
 		avatarURLCopy := *system_model.GravatarSourceURL

models/fixtures/system_setting.yml

@@ -1,6 +1,6 @@
 -
   id: 1
-  setting_key: 'disable_gravatar'
+  setting_key: 'picture.disable_gravatar'
   setting_value: 'false'
   version: 1
   created: 1653533198
@@ -8,7 +8,7 @@
 
 -
   id: 2
-  setting_key: 'enable_federated_avatar'
+  setting_key: 'picture.enable_federated_avatar'
   setting_value: 'false'
   version: 1
   created: 1653533198

models/system/setting.go

@@ -94,11 +94,14 @@ func GetSetting(ctx context.Context, key string) (*Setting, error) {
 const contextCacheKey = "system_setting"
 
 // GetSettingWithCache returns the setting value via the key
-func GetSettingWithCache(ctx context.Context, key string) (string, error) {
+func GetSettingWithCache(ctx context.Context, key, defaultVal string) (string, error) {
 	return cache.GetWithContextCache(ctx, contextCacheKey, key, func() (string, error) {
 		return cache.GetString(genSettingCacheKey(key), func() (string, error) {
 			res, err := GetSetting(ctx, key)
 			if err != nil {
+				if IsErrSettingIsNotExist(err) {
+					return defaultVal, nil
+				}
 				return "", err
 			}
 			return res.SettingValue, nil
@@ -108,17 +111,21 @@ func GetSettingWithCache(ctx context.Context, key string) (string, error) {
 
 // GetSettingBool return bool value of setting,
 // none existing keys and errors are ignored and result in false
-func GetSettingBool(ctx context.Context, key string) bool {
-	s, _ := GetSetting(ctx, key)
-	if s == nil {
-		return false
+func GetSettingBool(ctx context.Context, key string, defaultVal bool) (bool, error) {
+	s, err := GetSetting(ctx, key)
+	switch {
+	case err == nil:
+		v, _ := strconv.ParseBool(s.SettingValue)
+		return v, nil
+	case IsErrSettingIsNotExist(err):
+		return defaultVal, nil
+	default:
+		return false, err
 	}
-	v, _ := strconv.ParseBool(s.SettingValue)
-	return v
 }
 
-func GetSettingWithCacheBool(ctx context.Context, key string) bool {
-	s, _ := GetSettingWithCache(ctx, key)
+func GetSettingWithCacheBool(ctx context.Context, key string, defaultVal bool) bool {
+	s, _ := GetSettingWithCache(ctx, key, strconv.FormatBool(defaultVal))
 	v, _ := strconv.ParseBool(s)
 	return v
 }
@@ -259,52 +266,41 @@ var (
 )
 
 func Init(ctx context.Context) error {
-	var disableGravatar bool
-	disableGravatarSetting, err := GetSetting(ctx, KeyPictureDisableGravatar)
-	if IsErrSettingIsNotExist(err) {
-		disableGravatar = setting_module.GetDefaultDisableGravatar()
-		disableGravatarSetting = &Setting{SettingValue: strconv.FormatBool(disableGravatar)}
-	} else if err != nil {
+	disableGravatar, err := GetSettingBool(ctx, KeyPictureDisableGravatar, setting_module.GetDefaultDisableGravatar())
+	if err != nil {
 		return err
-	} else {
-		disableGravatar = disableGravatarSetting.GetValueBool()
 	}
 
-	var enableFederatedAvatar bool
-	enableFederatedAvatarSetting, err := GetSetting(ctx, KeyPictureEnableFederatedAvatar)
-	if IsErrSettingIsNotExist(err) {
-		enableFederatedAvatar = setting_module.GetDefaultEnableFederatedAvatar(disableGravatar)
-		enableFederatedAvatarSetting = &Setting{SettingValue: strconv.FormatBool(enableFederatedAvatar)}
-	} else if err != nil {
+	enableFederatedAvatar, err := GetSettingBool(ctx, KeyPictureEnableFederatedAvatar, setting_module.GetDefaultEnableFederatedAvatar(disableGravatar))
+	if err != nil {
 		return err
-	} else {
-		enableFederatedAvatar = disableGravatarSetting.GetValueBool()
 	}
 
 	if setting_module.OfflineMode {
-		disableGravatar = true
-		enableFederatedAvatar = false
-		if !GetSettingBool(ctx, KeyPictureDisableGravatar) {
+		if !disableGravatar {
 			if err := SetSettingNoVersion(ctx, KeyPictureDisableGravatar, "true"); err != nil {
-				return fmt.Errorf("Failed to set setting %q: %w", KeyPictureDisableGravatar, err)
+				return fmt.Errorf("failed to set setting %q: %w", KeyPictureDisableGravatar, err)
 			}
 		}
-		if GetSettingBool(ctx, KeyPictureEnableFederatedAvatar) {
+		disableGravatar = true
+
+		if enableFederatedAvatar {
 			if err := SetSettingNoVersion(ctx, KeyPictureEnableFederatedAvatar, "false"); err != nil {
-				return fmt.Errorf("Failed to set setting %q: %w", KeyPictureEnableFederatedAvatar, err)
+				return fmt.Errorf("failed to set setting %q: %w", KeyPictureEnableFederatedAvatar, err)
 			}
 		}
+		enableFederatedAvatar = false
 	}
 
 	if enableFederatedAvatar || !disableGravatar {
 		var err error
 		GravatarSourceURL, err = url.Parse(setting_module.GravatarSource)
 		if err != nil {
-			return fmt.Errorf("Failed to parse Gravatar URL(%s): %w", setting_module.GravatarSource, err)
+			return fmt.Errorf("failed to parse Gravatar URL(%s): %w", setting_module.GravatarSource, err)
 		}
 	}
 
-	if GravatarSourceURL != nil && enableFederatedAvatarSetting.GetValueBool() {
+	if GravatarSourceURL != nil && enableFederatedAvatar {
 		LibravatarService = libravatar.New()
 		if GravatarSourceURL.Scheme == "https" {
 			LibravatarService.SetUseHTTPS(true)

models/user/avatar.go

@@ -67,7 +67,9 @@ func (u *User) AvatarLinkWithSize(ctx context.Context, size int) string {
 	useLocalAvatar := false
 	autoGenerateAvatar := false
 
-	disableGravatar := system_model.GetSettingWithCacheBool(ctx, system_model.KeyPictureDisableGravatar)
+	disableGravatar := system_model.GetSettingWithCacheBool(ctx, system_model.KeyPictureDisableGravatar,
+		setting.GetDefaultDisableGravatar(),
+	)
 
 	switch {
 	case u.UseCustomAvatar: