Fix context cache bug & enable context cache for dashabord commits' authors(#26991) (#27017)

backport #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 .

7 files changed, 62 insertions, 84 deletions

diff --git a/models/avatars/avatar.go b/models/avatars/avatar.go
index 265ee6428e..e40aa3f542 100644
--- a/models/avatars/avatar.go
+++ b/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
diff --git a/models/fixtures/system_setting.yml b/models/fixtures/system_setting.yml
index 6c960168fc..30542bc82a 100644
--- a/models/fixtures/system_setting.yml
+++ b/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
diff --git a/models/system/setting.go b/models/system/setting.go
index 6af759dc8a..9fffa74e94 100644
--- a/models/system/setting.go
+++ b/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)
diff --git a/models/user/avatar.go b/models/user/avatar.go
index 3d1e2ed20b..7f996fa79a 100644
--- a/models/user/avatar.go
+++ b/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:
diff --git a/modules/repository/commits.go b/modules/repository/commits.go
index 96844d5b1d..ede60429a1 100644
--- a/modules/repository/commits.go
+++ b/modules/repository/commits.go
@@ -11,6 +11,7 @@ import (
 
 	"code.gitea.io/gitea/models/avatars"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/cache"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
@@ -34,42 +35,36 @@ type PushCommits struct {
 	HeadCommit *PushCommit
 	CompareURL string
 	Len        int
-
-	avatars    map[string]string
-	emailUsers map[string]*user_model.User
 }
 
 // NewPushCommits creates a new PushCommits object.
 func NewPushCommits() *PushCommits {
-	return &PushCommits{
-		avatars:    make(map[string]string),
-		emailUsers: make(map[string]*user_model.User),
-	}
+	return &PushCommits{}
 }
 
 // toAPIPayloadCommit converts a single PushCommit to an api.PayloadCommit object.
-func (pc *PushCommits) toAPIPayloadCommit(ctx context.Context, repoPath, repoLink string, commit *PushCommit) (*api.PayloadCommit, error) {
+func (pc *PushCommits) toAPIPayloadCommit(ctx context.Context, emailUsers map[string]*user_model.User, repoPath, repoLink string, commit *PushCommit) (*api.PayloadCommit, error) {
 	var err error
 	authorUsername := ""
-	author, ok := pc.emailUsers[commit.AuthorEmail]
+	author, ok := emailUsers[commit.AuthorEmail]
 	if !ok {
 		author, err = user_model.GetUserByEmail(ctx, commit.AuthorEmail)
 		if err == nil {
 			authorUsername = author.Name
-			pc.emailUsers[commit.AuthorEmail] = author
+			emailUsers[commit.AuthorEmail] = author
 		}
 	} else {
 		authorUsername = author.Name
 	}
 
 	committerUsername := ""
-	committer, ok := pc.emailUsers[commit.CommitterEmail]
+	committer, ok := emailUsers[commit.CommitterEmail]
 	if !ok {
 		committer, err = user_model.GetUserByEmail(ctx, commit.CommitterEmail)
 		if err == nil {
 			// TODO: check errors other than email not found.
 			committerUsername = committer.Name
-			pc.emailUsers[commit.CommitterEmail] = committer
+			emailUsers[commit.CommitterEmail] = committer
 		}
 	} else {
 		committerUsername = committer.Name
@@ -107,11 +102,10 @@ func (pc *PushCommits) ToAPIPayloadCommits(ctx context.Context, repoPath, repoLi
 	commits := make([]*api.PayloadCommit, len(pc.Commits))
 	var headCommit *api.PayloadCommit
 
-	if pc.emailUsers == nil {
-		pc.emailUsers = make(map[string]*user_model.User)
-	}
+	emailUsers := make(map[string]*user_model.User)
+
 	for i, commit := range pc.Commits {
-		apiCommit, err := pc.toAPIPayloadCommit(ctx, repoPath, repoLink, commit)
+		apiCommit, err := pc.toAPIPayloadCommit(ctx, emailUsers, repoPath, repoLink, commit)
 		if err != nil {
 			return nil, nil, err
 		}
@@ -123,7 +117,7 @@ func (pc *PushCommits) ToAPIPayloadCommits(ctx context.Context, repoPath, repoLi
 	}
 	if pc.HeadCommit != nil && headCommit == nil {
 		var err error
-		headCommit, err = pc.toAPIPayloadCommit(ctx, repoPath, repoLink, pc.HeadCommit)
+		headCommit, err = pc.toAPIPayloadCommit(ctx, emailUsers, repoPath, repoLink, pc.HeadCommit)
 		if err != nil {
 			return nil, nil, err
 		}
@@ -134,35 +128,21 @@ func (pc *PushCommits) ToAPIPayloadCommits(ctx context.Context, repoPath, repoLi
 // AvatarLink tries to match user in database with e-mail
 // in order to show custom avatar, and falls back to general avatar link.
 func (pc *PushCommits) AvatarLink(ctx context.Context, email string) string {
-	if pc.avatars == nil {
-		pc.avatars = make(map[string]string)
-	}
-	avatar, ok := pc.avatars[email]
-	if ok {
-		return avatar
-	}
-
 	size := avatars.DefaultAvatarPixelSize * setting.Avatar.RenderedSizeFactor
 
-	u, ok := pc.emailUsers[email]
-	if !ok {
-		var err error
-		u, err = user_model.GetUserByEmail(ctx, email)
+	v, _ := cache.GetWithContextCache(ctx, "push_commits", email, func() (string, error) {
+		u, err := user_model.GetUserByEmail(ctx, email)
 		if err != nil {
-			pc.avatars[email] = avatars.GenerateEmailAvatarFastLink(ctx, email, size)
 			if !user_model.IsErrUserNotExist(err) {
 				log.Error("GetUserByEmail: %v", err)
-				return ""
+				return "", err
 			}
-		} else {
-			pc.emailUsers[email] = u
+			return avatars.GenerateEmailAvatarFastLink(ctx, email, size), nil
 		}
-	}
-	if u != nil {
-		pc.avatars[email] = u.AvatarLinkWithSize(ctx, size)
-	}
+		return u.AvatarLinkWithSize(ctx, size), nil
+	})
 
-	return pc.avatars[email]
+	return v
 }
 
 // CommitToPushCommit transforms a git.Commit to PushCommit type.
@@ -189,7 +169,5 @@ func GitToPushCommits(gitCommits []*git.Commit) *PushCommits {
 		HeadCommit: nil,
 		CompareURL: "",
 		Len:        len(commits),
-		avatars:    make(map[string]string),
-		emailUsers: make(map[string]*user_model.User),
 	}
 }
diff --git a/modules/repository/commits_test.go b/modules/repository/commits_test.go
index b6ad967d4c..0931092597 100644
--- a/modules/repository/commits_test.go
+++ b/modules/repository/commits_test.go
@@ -103,11 +103,9 @@ func TestPushCommits_ToAPIPayloadCommits(t *testing.T) {
 	assert.EqualValues(t, []string{"readme.md"}, headCommit.Modified)
 }
 
-func enableGravatar(t *testing.T) {
-	err := system_model.SetSettingNoVersion(db.DefaultContext, system_model.KeyPictureDisableGravatar, "false")
-	assert.NoError(t, err)
+func initGravatarSource(t *testing.T) {
 	setting.GravatarSource = "https://secure.gravatar.com/avatar"
-	err = system_model.Init(db.DefaultContext)
+	err := system_model.Init(db.DefaultContext)
 	assert.NoError(t, err)
 }
 
@@ -134,7 +132,7 @@ func TestPushCommits_AvatarLink(t *testing.T) {
 		},
 	}
 
-	enableGravatar(t)
+	initGravatarSource(t)
 
 	assert.Equal(t,
 		"https://secure.gravatar.com/avatar/ab53a2911ddf9b4817ac01ddcd3d975f?d=identicon&s="+strconv.Itoa(28*setting.Avatar.RenderedSizeFactor),
diff --git a/modules/templates/helper.go b/modules/templates/helper.go
index 2b918f42c0..ff60054c40 100644
--- a/modules/templates/helper.go
+++ b/modules/templates/helper.go
@@ -104,7 +104,7 @@ func NewFuncMap() template.FuncMap {
 			return setting.AssetVersion
 		},
 		"DisableGravatar": func(ctx context.Context) bool {
-			return system_model.GetSettingWithCacheBool(ctx, system_model.KeyPictureDisableGravatar)
+			return system_model.GetSettingWithCacheBool(ctx, system_model.KeyPictureDisableGravatar, setting.GetDefaultDisableGravatar())
 		},
 		"DefaultShowFullName": func() bool {
 			return setting.UI.DefaultShowFullName