Always enable caches (#28527)

Nowadays, cache will be used on almost everywhere of Gitea and it cannot
be disabled, otherwise some features will become unaviable.

Then I think we can just remove the option for cache enable. That means
cache cannot be disabled.
But of course, we can still use cache configuration to set how should
Gitea use the cache.

14 files changed, 31 insertions, 82 deletions

diff --git a/custom/conf/app.example.ini b/custom/conf/app.example.ini
index 9a5d190745..f10a3f2edf 100644
--- a/custom/conf/app.example.ini
+++ b/custom/conf/app.example.ini
@@ -1705,9 +1705,6 @@ LEVEL = Info
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;
-;; if the cache enabled
-;ENABLED = true
-;;
 ;; Either "memory", "redis", "memcache", or "twoqueue". default is "memory"
 ;ADAPTER = memory
 ;;
@@ -1732,8 +1729,6 @@ LEVEL = Info
 ;[cache.last_commit]
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;; if the cache enabled
-;ENABLED = true
 ;;
 ;; Time to keep items in cache if not used, default is 8760 hours.
 ;; Setting it to -1 disables caching
diff --git a/docs/content/administration/config-cheat-sheet.en-us.md b/docs/content/administration/config-cheat-sheet.en-us.md
index 9810dab49b..93a19cec4e 100644
--- a/docs/content/administration/config-cheat-sheet.en-us.md
+++ b/docs/content/administration/config-cheat-sheet.en-us.md
@@ -763,7 +763,6 @@ and
 
 ## Cache (`cache`)
 
-- `ENABLED`: **true**: Enable the cache.
 - `ADAPTER`: **memory**: Cache engine adapter, either `memory`, `redis`, `redis-cluster`, `twoqueue` or `memcache`. (`twoqueue` represents a size limited LRU cache.)
 - `INTERVAL`: **60**: Garbage Collection interval (sec), for memory and twoqueue cache only.
 - `HOST`: **_empty_**: Connection string for `redis`, `redis-cluster` and `memcache`. For `twoqueue` sets configuration for the queue.
@@ -775,7 +774,6 @@ and
 
 ## Cache - LastCommitCache settings (`cache.last_commit`)
 
-- `ENABLED`: **true**: Enable the cache.
 - `ITEM_TTL`: **8760h**: Time to keep items in cache if not used, Setting it to -1 disables caching.
 - `COMMITS_COUNT`: **1000**: Only enable the cache when repository's commits count great than.
 
diff --git a/docs/content/administration/config-cheat-sheet.zh-cn.md b/docs/content/administration/config-cheat-sheet.zh-cn.md
index eed752c1cb..596e82a12a 100644
--- a/docs/content/administration/config-cheat-sheet.zh-cn.md
+++ b/docs/content/administration/config-cheat-sheet.zh-cn.md
@@ -721,7 +721,6 @@ Gitea 创建以下非唯一队列：
 
 ## 缓存 (`cache`)
 
-- `ENABLED`: **true**: 是否启用缓存。
 - `ADAPTER`: **memory**: 缓存引擎，可以为 `memory`, `redis`, `redis-cluster`, `twoqueue` 和 `memcache`. (`twoqueue` 代表缓冲区固定的LRU缓存)
 - `INTERVAL`: **60**: 垃圾回收间隔(秒)，只对`memory`和`towqueue`有效。
 - `HOST`: **_empty_**: 缓存配置。`redis`, `redis-cluster`，`memcache`配置连接字符串;`twoqueue` 设置队列参数
@@ -733,7 +732,6 @@ Gitea 创建以下非唯一队列：
 
 ### 缓存 - 最后提交缓存设置 (`cache.last_commit`)
 
-- `ENABLED`: **true**：是否启用缓存。
 - `ITEM_TTL`: **8760h**：如果未使用，保持缓存中的项目的时间，将其设置为 -1 会禁用缓存。
 - `COMMITS_COUNT`: **1000**：仅在存储库的提交计数大于时启用缓存。
 
diff --git a/modules/cache/cache.go b/modules/cache/cache.go
index edaf483135..09afc8b7f7 100644
--- a/modules/cache/cache.go
+++ b/modules/cache/cache.go
@@ -24,11 +24,11 @@ func newCache(cacheConfig setting.Cache) (mc.Cache, error) {
 	})
 }
 
-// NewContext start cache service
-func NewContext() error {
+// Init start cache service
+func Init() error {
 	var err error
 
-	if conn == nil && setting.CacheService.Enabled {
+	if conn == nil {
 		if conn, err = newCache(setting.CacheService.Cache); err != nil {
 			return err
 		}
diff --git a/modules/cache/cache_test.go b/modules/cache/cache_test.go
index cf464af392..3f65040924 100644
--- a/modules/cache/cache_test.go
+++ b/modules/cache/cache_test.go
@@ -22,9 +22,9 @@ func createTestCache() {
 }
 
 func TestNewContext(t *testing.T) {
-	assert.NoError(t, NewContext())
+	assert.NoError(t, Init())
 
-	setting.CacheService.Cache = setting.Cache{Enabled: true, Adapter: "redis", Conn: "some random string"}
+	setting.CacheService.Cache = setting.Cache{Adapter: "redis", Conn: "some random string"}
 	con, err := newCache(setting.Cache{
 		Adapter:  "rand",
 		Conn:     "false conf",
diff --git a/modules/git/last_commit_cache.go b/modules/git/last_commit_cache.go
index 44a4f43728..7c7baedd2f 100644
--- a/modules/git/last_commit_cache.go
+++ b/modules/git/last_commit_cache.go
@@ -39,7 +39,7 @@ func NewLastCommitCache(count int64, repoPath string, gitRepo *Repository, cache
 	if cache == nil {
 		return nil
 	}
-	if !setting.CacheService.LastCommit.Enabled || count < setting.CacheService.LastCommit.CommitsCount {
+	if count < setting.CacheService.LastCommit.CommitsCount {
 		return nil
 	}
 
diff --git a/modules/setting/cache.go b/modules/setting/cache.go
index 783246077d..bfa6ca0e61 100644
--- a/modules/setting/cache.go
+++ b/modules/setting/cache.go
@@ -12,7 +12,6 @@ import (
 
 // Cache represents cache settings
 type Cache struct {
-	Enabled  bool
 	Adapter  string
 	Interval int
 	Conn     string
@@ -24,23 +23,19 @@ var CacheService = struct {
 	Cache `ini:"cache"`
 
 	LastCommit struct {
-		Enabled      bool
 		TTL          time.Duration `ini:"ITEM_TTL"`
 		CommitsCount int64
 	} `ini:"cache.last_commit"`
 }{
 	Cache: Cache{
-		Enabled:  true,
 		Adapter:  "memory",
 		Interval: 60,
 		TTL:      16 * time.Hour,
 	},
 	LastCommit: struct {
-		Enabled      bool
 		TTL          time.Duration `ini:"ITEM_TTL"`
 		CommitsCount int64
 	}{
-		Enabled:      true,
 		TTL:          8760 * time.Hour,
 		CommitsCount: 1000,
 	},
@@ -65,30 +60,12 @@ func loadCacheFrom(rootCfg ConfigProvider) {
 		if CacheService.Conn == "" {
 			CacheService.Conn = "50000"
 		}
-	case "": // disable cache
-		CacheService.Enabled = false
 	default:
 		log.Fatal("Unknown cache adapter: %s", CacheService.Adapter)
 	}
 
-	if CacheService.Enabled {
-		log.Info("Cache Service Enabled")
-	} else {
-		log.Warn("Cache Service Disabled so that captcha disabled too")
-		// captcha depends on cache service
-		Service.EnableCaptcha = false
-	}
-
 	sec = rootCfg.Section("cache.last_commit")
-	if !CacheService.Enabled {
-		CacheService.LastCommit.Enabled = false
-	}
-
 	CacheService.LastCommit.CommitsCount = sec.Key("COMMITS_COUNT").MustInt64(1000)
-
-	if CacheService.LastCommit.Enabled {
-		log.Info("Last Commit Cache Service Enabled")
-	}
 }
 
 // TTLSeconds returns the TTLSeconds or unix timestamp for memcache
diff --git a/routers/api/v1/misc/nodeinfo.go b/routers/api/v1/misc/nodeinfo.go
index f0d8d80dd4..cc754f64a2 100644
--- a/routers/api/v1/misc/nodeinfo.go
+++ b/routers/api/v1/misc/nodeinfo.go
@@ -29,10 +29,9 @@ func NodeInfo(ctx *context.APIContext) {
 
 	nodeInfoUsage := structs.NodeInfoUsage{}
 	if setting.Federation.ShareUserStatistics {
-		cached := false
-		if setting.CacheService.Enabled {
-			nodeInfoUsage, cached = ctx.Cache.Get(cacheKeyNodeInfoUsage).(structs.NodeInfoUsage)
-		}
+		var cached bool
+		nodeInfoUsage, cached = ctx.Cache.Get(cacheKeyNodeInfoUsage).(structs.NodeInfoUsage)
+
 		if !cached {
 			usersTotal := int(user_model.CountUsers(ctx, nil))
 			now := time.Now()
@@ -53,11 +52,10 @@ func NodeInfo(ctx *context.APIContext) {
 				LocalPosts:    int(allIssues),
 				LocalComments: int(allComments),
 			}
-			if setting.CacheService.Enabled {
-				if err := ctx.Cache.Put(cacheKeyNodeInfoUsage, nodeInfoUsage, 180); err != nil {
-					ctx.InternalServerError(err)
-					return
-				}
+
+			if err := ctx.Cache.Put(cacheKeyNodeInfoUsage, nodeInfoUsage, 180); err != nil {
+				ctx.InternalServerError(err)
+				return
 			}
 		}
 	}
diff --git a/routers/init.go b/routers/init.go
index c1cfe26bc4..ee98aedb16 100644
--- a/routers/init.go
+++ b/routers/init.go
@@ -118,7 +118,7 @@ func InitWebInstalled(ctx context.Context) {
 	mustInit(storage.Init)
 
 	mailer.NewContext(ctx)
-	mustInit(cache.NewContext)
+	mustInit(cache.Init)
 	mustInit(feed_service.Init)
 	mustInit(uinotification.Init)
 	mustInitCtx(ctx, archiver.Init)
diff --git a/routers/web/auth/auth.go b/routers/web/auth/auth.go
index 0ea91fc759..8f37d05fda 100644
--- a/routers/web/auth/auth.go
+++ b/routers/web/auth/auth.go
@@ -622,10 +622,8 @@ func handleUserCreated(ctx *context.Context, u *user_model.User, gothUser *goth.
 		ctx.Data["ActiveCodeLives"] = timeutil.MinutesToFriendly(setting.Service.ActiveCodeLives, ctx.Locale)
 		ctx.HTML(http.StatusOK, TplActivate)
 
-		if setting.CacheService.Enabled {
-			if err := ctx.Cache.Put("MailResendLimit_"+u.LowerName, u.LowerName, 180); err != nil {
-				log.Error("Set cache(MailResendLimit) fail: %v", err)
-			}
+		if err := ctx.Cache.Put("MailResendLimit_"+u.LowerName, u.LowerName, 180); err != nil {
+			log.Error("Set cache(MailResendLimit) fail: %v", err)
 		}
 		return false
 	}
@@ -645,16 +643,14 @@ func Activate(ctx *context.Context) {
 		}
 		// Resend confirmation email.
 		if setting.Service.RegisterEmailConfirm {
-			if setting.CacheService.Enabled && ctx.Cache.IsExist("MailResendLimit_"+ctx.Doer.LowerName) {
+			if ctx.Cache.IsExist("MailResendLimit_" + ctx.Doer.LowerName) {
 				ctx.Data["ResendLimited"] = true
 			} else {
 				ctx.Data["ActiveCodeLives"] = timeutil.MinutesToFriendly(setting.Service.ActiveCodeLives, ctx.Locale)
 				mailer.SendActivateAccountMail(ctx.Locale, ctx.Doer)
 
-				if setting.CacheService.Enabled {
-					if err := ctx.Cache.Put("MailResendLimit_"+ctx.Doer.LowerName, ctx.Doer.LowerName, 180); err != nil {
-						log.Error("Set cache(MailResendLimit) fail: %v", err)
-					}
+				if err := ctx.Cache.Put("MailResendLimit_"+ctx.Doer.LowerName, ctx.Doer.LowerName, 180); err != nil {
+					log.Error("Set cache(MailResendLimit) fail: %v", err)
 				}
 			}
 		} else {
@@ -789,7 +785,7 @@ func ActivateEmail(ctx *context.Context) {
 
 		if u, err := user_model.GetUserByID(ctx, email.UID); err != nil {
 			log.Warn("GetUserByID: %d", email.UID)
-		} else if setting.CacheService.Enabled {
+		} else {
 			// Allow user to validate more emails
 			_ = ctx.Cache.Delete("MailResendLimit_" + u.LowerName)
 		}
diff --git a/routers/web/auth/password.go b/routers/web/auth/password.go
index bdfa8c4025..def9c2bcaa 100644
--- a/routers/web/auth/password.go
+++ b/routers/web/auth/password.go
@@ -79,7 +79,7 @@ func ForgotPasswdPost(ctx *context.Context) {
 		return
 	}
 
-	if setting.CacheService.Enabled && ctx.Cache.IsExist("MailResendLimit_"+u.LowerName) {
+	if ctx.Cache.IsExist("MailResendLimit_" + u.LowerName) {
 		ctx.Data["ResendLimited"] = true
 		ctx.HTML(http.StatusOK, tplForgotPassword)
 		return
@@ -87,10 +87,8 @@ func ForgotPasswdPost(ctx *context.Context) {
 
 	mailer.SendResetPasswordMail(u)
 
-	if setting.CacheService.Enabled {
-		if err = ctx.Cache.Put("MailResendLimit_"+u.LowerName, u.LowerName, 180); err != nil {
-			log.Error("Set cache(MailResendLimit) fail: %v", err)
-		}
+	if err = ctx.Cache.Put("MailResendLimit_"+u.LowerName, u.LowerName, 180); err != nil {
+		log.Error("Set cache(MailResendLimit) fail: %v", err)
 	}
 
 	ctx.Data["ResetPwdCodeLives"] = timeutil.MinutesToFriendly(setting.Service.ResetPwdCodeLives, ctx.Locale)
diff --git a/routers/web/healthcheck/check.go b/routers/web/healthcheck/check.go
index ecb73a928f..85f47613f0 100644
--- a/routers/web/healthcheck/check.go
+++ b/routers/web/healthcheck/check.go
@@ -121,10 +121,6 @@ func checkDatabase(ctx context.Context, checks checks) status {
 
 // cache checks gitea cache status
 func checkCache(checks checks) status {
-	if !setting.CacheService.Enabled {
-		return pass
-	}
-
 	st := componentStatus{}
 	if err := cache.GetCache().Ping(); err != nil {
 		st.Status = fail
diff --git a/routers/web/user/setting/account.go b/routers/web/user/setting/account.go
index 5c14f3ad4b..6d61d8021c 100644
--- a/routers/web/user/setting/account.go
+++ b/routers/web/user/setting/account.go
@@ -105,7 +105,7 @@ func EmailPost(ctx *context.Context) {
 	// Send activation Email
 	if ctx.FormString("_method") == "SENDACTIVATION" {
 		var address string
-		if setting.CacheService.Enabled && ctx.Cache.IsExist("MailResendLimit_"+ctx.Doer.LowerName) {
+		if ctx.Cache.IsExist("MailResendLimit_" + ctx.Doer.LowerName) {
 			log.Error("Send activation: activation still pending")
 			ctx.Redirect(setting.AppSubURL + "/user/settings/account")
 			return
@@ -141,11 +141,10 @@ func EmailPost(ctx *context.Context) {
 		}
 		address = email.Email
 
-		if setting.CacheService.Enabled {
-			if err := ctx.Cache.Put("MailResendLimit_"+ctx.Doer.LowerName, ctx.Doer.LowerName, 180); err != nil {
-				log.Error("Set cache(MailResendLimit) fail: %v", err)
-			}
+		if err := ctx.Cache.Put("MailResendLimit_"+ctx.Doer.LowerName, ctx.Doer.LowerName, 180); err != nil {
+			log.Error("Set cache(MailResendLimit) fail: %v", err)
 		}
+
 		ctx.Flash.Info(ctx.Tr("settings.add_email_confirmation_sent", address, timeutil.MinutesToFriendly(setting.Service.ActiveCodeLives, ctx.Locale)))
 		ctx.Redirect(setting.AppSubURL + "/user/settings/account")
 		return
@@ -204,11 +203,10 @@ func EmailPost(ctx *context.Context) {
 	// Send confirmation email
 	if setting.Service.RegisterEmailConfirm {
 		mailer.SendActivateEmailMail(ctx.Doer, email)
-		if setting.CacheService.Enabled {
-			if err := ctx.Cache.Put("MailResendLimit_"+ctx.Doer.LowerName, ctx.Doer.LowerName, 180); err != nil {
-				log.Error("Set cache(MailResendLimit) fail: %v", err)
-			}
+		if err := ctx.Cache.Put("MailResendLimit_"+ctx.Doer.LowerName, ctx.Doer.LowerName, 180); err != nil {
+			log.Error("Set cache(MailResendLimit) fail: %v", err)
 		}
+
 		ctx.Flash.Info(ctx.Tr("settings.add_email_confirmation_sent", email.Email, timeutil.MinutesToFriendly(setting.Service.ActiveCodeLives, ctx.Locale)))
 	} else {
 		ctx.Flash.Success(ctx.Tr("settings.add_email_success"))
@@ -276,7 +274,7 @@ func loadAccountData(ctx *context.Context) {
 		user_model.EmailAddress
 		CanBePrimary bool
 	}
-	pendingActivation := setting.CacheService.Enabled && ctx.Cache.IsExist("MailResendLimit_"+ctx.Doer.LowerName)
+	pendingActivation := ctx.Cache.IsExist("MailResendLimit_" + ctx.Doer.LowerName)
 	emails := make([]*UserEmail, len(emlist))
 	for i, em := range emlist {
 		var email UserEmail
diff --git a/services/repository/cache.go b/services/repository/cache.go
index 91351cbf49..b0811a99fc 100644
--- a/services/repository/cache.go
+++ b/services/repository/cache.go
@@ -9,15 +9,10 @@ import (
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/modules/cache"
 	"code.gitea.io/gitea/modules/git"
-	"code.gitea.io/gitea/modules/setting"
 )
 
 // CacheRef cachhe last commit information of the branch or the tag
 func CacheRef(ctx context.Context, repo *repo_model.Repository, gitRepo *git.Repository, fullRefName git.RefName) error {
-	if !setting.CacheService.LastCommit.Enabled {
-		return nil
-	}
-
 	commit, err := gitRepo.GetCommit(fullRefName.String())
 	if err != nil {
 		return err