Add generic set type (#21408)

This PR adds a generic set type to get rid of maps used as sets.

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

19 files changed, 174 insertions, 114 deletions

diff --git a/modules/base/tool.go b/modules/base/tool.go
index a981fd6c57..f1e4a3bf97 100644
--- a/modules/base/tool.go
+++ b/modules/base/tool.go
@@ -241,15 +241,6 @@ func Int64sToStrings(ints []int64) []string {
 	return strs
 }
 
-// Int64sToMap converts a slice of int64 to a int64 map.
-func Int64sToMap(ints []int64) map[int64]bool {
-	m := make(map[int64]bool)
-	for _, i := range ints {
-		m[i] = true
-	}
-	return m
-}
-
 // Int64sContains returns if a int64 in a slice of int64
 func Int64sContains(intsSlice []int64, a int64) bool {
 	for _, c := range intsSlice {
diff --git a/modules/base/tool_test.go b/modules/base/tool_test.go
index 6685168bac..87de898e0b 100644
--- a/modules/base/tool_test.go
+++ b/modules/base/tool_test.go
@@ -214,16 +214,7 @@ func TestInt64sToStrings(t *testing.T) {
 	)
 }
 
-func TestInt64sToMap(t *testing.T) {
-	assert.Equal(t, map[int64]bool{}, Int64sToMap([]int64{}))
-	assert.Equal(t,
-		map[int64]bool{1: true, 4: true, 16: true},
-		Int64sToMap([]int64{1, 4, 16}),
-	)
-}
-
 func TestInt64sContains(t *testing.T) {
-	assert.Equal(t, map[int64]bool{}, Int64sToMap([]int64{}))
 	assert.True(t, Int64sContains([]int64{6, 44324, 4324, 32, 1, 2323}, 1))
 	assert.True(t, Int64sContains([]int64{2323}, 2323))
 	assert.False(t, Int64sContains([]int64{6, 44324, 4324, 32, 1, 2323}, 232))
diff --git a/modules/container/map.go b/modules/container/map.go
deleted file mode 100644
index 3519de0951..0000000000
--- a/modules/container/map.go
+++ /dev/null
@@ -1,14 +0,0 @@
-// Copyright 2022 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
-
-package container
-
-// KeysInt64 returns keys slice for a map with int64 key
-func KeysInt64(m map[int64]struct{}) []int64 {
-	keys := make([]int64, 0, len(m))
-	for k := range m {
-		keys = append(keys, k)
-	}
-	return keys
-}
diff --git a/modules/container/set.go b/modules/container/set.go
new file mode 100644
index 0000000000..4b4c74525d
--- /dev/null
+++ b/modules/container/set.go
@@ -0,0 +1,57 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package container
+
+type Set[T comparable] map[T]struct{}
+
+// SetOf creates a set and adds the specified elements to it.
+func SetOf[T comparable](values ...T) Set[T] {
+	s := make(Set[T], len(values))
+	s.AddMultiple(values...)
+	return s
+}
+
+// Add adds the specified element to a set.
+// Returns true if the element is added; false if the element is already present.
+func (s Set[T]) Add(value T) bool {
+	if _, has := s[value]; !has {
+		s[value] = struct{}{}
+		return true
+	}
+	return false
+}
+
+// AddMultiple adds the specified elements to a set.
+func (s Set[T]) AddMultiple(values ...T) {
+	for _, value := range values {
+		s.Add(value)
+	}
+}
+
+// Contains determines whether a set contains the specified element.
+// Returns true if the set contains the specified element; otherwise, false.
+func (s Set[T]) Contains(value T) bool {
+	_, has := s[value]
+	return has
+}
+
+// Remove removes the specified element.
+// Returns true if the element is successfully found and removed; otherwise, false.
+func (s Set[T]) Remove(value T) bool {
+	if _, has := s[value]; has {
+		delete(s, value)
+		return true
+	}
+	return false
+}
+
+// Values gets a list of all elements in the set.
+func (s Set[T]) Values() []T {
+	keys := make([]T, 0, len(s))
+	for k := range s {
+		keys = append(keys, k)
+	}
+	return keys
+}
diff --git a/modules/container/set_test.go b/modules/container/set_test.go
new file mode 100644
index 0000000000..6654763e56
--- /dev/null
+++ b/modules/container/set_test.go
@@ -0,0 +1,37 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package container
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSet(t *testing.T) {
+	s := make(Set[string])
+
+	assert.True(t, s.Add("key1"))
+	assert.False(t, s.Add("key1"))
+	assert.True(t, s.Add("key2"))
+
+	assert.True(t, s.Contains("key1"))
+	assert.True(t, s.Contains("key2"))
+	assert.False(t, s.Contains("key3"))
+
+	assert.True(t, s.Remove("key2"))
+	assert.False(t, s.Contains("key2"))
+
+	assert.False(t, s.Remove("key3"))
+
+	s.AddMultiple("key4", "key5")
+	assert.True(t, s.Contains("key4"))
+	assert.True(t, s.Contains("key5"))
+
+	s = SetOf("key6", "key7")
+	assert.False(t, s.Contains("key1"))
+	assert.True(t, s.Contains("key6"))
+	assert.True(t, s.Contains("key7"))
+}
diff --git a/modules/doctor/authorizedkeys.go b/modules/doctor/authorizedkeys.go
index 34dfe939d3..d4ceef87c0 100644
--- a/modules/doctor/authorizedkeys.go
+++ b/modules/doctor/authorizedkeys.go
@@ -14,6 +14,7 @@ import (
 	"strings"
 
 	asymkey_model "code.gitea.io/gitea/models/asymkey"
+	"code.gitea.io/gitea/modules/container"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
 )
@@ -40,7 +41,7 @@ func checkAuthorizedKeys(ctx context.Context, logger log.Logger, autofix bool) e
 	}
 	defer f.Close()
 
-	linesInAuthorizedKeys := map[string]bool{}
+	linesInAuthorizedKeys := make(container.Set[string])
 
 	scanner := bufio.NewScanner(f)
 	for scanner.Scan() {
@@ -48,7 +49,7 @@ func checkAuthorizedKeys(ctx context.Context, logger log.Logger, autofix bool) e
 		if strings.HasPrefix(line, tplCommentPrefix) {
 			continue
 		}
-		linesInAuthorizedKeys[line] = true
+		linesInAuthorizedKeys.Add(line)
 	}
 	f.Close()
 
@@ -64,7 +65,7 @@ func checkAuthorizedKeys(ctx context.Context, logger log.Logger, autofix bool) e
 		if strings.HasPrefix(line, tplCommentPrefix) {
 			continue
 		}
-		if ok := linesInAuthorizedKeys[line]; ok {
+		if linesInAuthorizedKeys.Contains(line) {
 			continue
 		}
 		if !autofix {
diff --git a/modules/git/log_name_status.go b/modules/git/log_name_status.go
index 80f1602708..469932525f 100644
--- a/modules/git/log_name_status.go
+++ b/modules/git/log_name_status.go
@@ -14,6 +14,8 @@ import (
 	"sort"
 	"strings"
 
+	"code.gitea.io/gitea/modules/container"
+
 	"github.com/djherbis/buffer"
 	"github.com/djherbis/nio/v3"
 )
@@ -339,7 +341,7 @@ func WalkGitLog(ctx context.Context, repo *Repository, head *Commit, treepath st
 	lastEmptyParent := head.ID.String()
 	commitSinceLastEmptyParent := uint64(0)
 	commitSinceNextRestart := uint64(0)
-	parentRemaining := map[string]bool{}
+	parentRemaining := make(container.Set[string])
 
 	changed := make([]bool, len(paths))
 
@@ -365,7 +367,7 @@ heaploop:
 		if current == nil {
 			break heaploop
 		}
-		delete(parentRemaining, current.CommitID)
+		parentRemaining.Remove(current.CommitID)
 		if current.Paths != nil {
 			for i, found := range current.Paths {
 				if !found {
@@ -410,14 +412,12 @@ heaploop:
 					}
 				}
 				g = NewLogNameStatusRepoParser(ctx, repo.Path, lastEmptyParent, treepath, remainingPaths...)
-				parentRemaining = map[string]bool{}
+				parentRemaining = make(container.Set[string])
 				nextRestart = (remaining * 3) / 4
 				continue heaploop
 			}
 		}
-		for _, parent := range current.ParentIDs {
-			parentRemaining[parent] = true
-		}
+		parentRemaining.AddMultiple(current.ParentIDs...)
 	}
 	g.Close()
 
diff --git a/modules/git/repo_stats.go b/modules/git/repo_stats.go
index c0c91c6fc6..cb44c58cec 100644
--- a/modules/git/repo_stats.go
+++ b/modules/git/repo_stats.go
@@ -13,6 +13,8 @@ import (
 	"strconv"
 	"strings"
 	"time"
+
+	"code.gitea.io/gitea/modules/container"
 )
 
 // CodeActivityStats represents git statistics data
@@ -80,7 +82,7 @@ func (repo *Repository) GetCodeActivityStats(fromTime time.Time, branch string)
 			stats.Additions = 0
 			stats.Deletions = 0
 			authors := make(map[string]*CodeActivityAuthor)
-			files := make(map[string]bool)
+			files := make(container.Set[string])
 			var author string
 			p := 0
 			for scanner.Scan() {
@@ -119,9 +121,7 @@ func (repo *Repository) GetCodeActivityStats(fromTime time.Time, branch string)
 								stats.Deletions += c
 							}
 						}
-						if _, ok := files[parts[2]]; !ok {
-							files[parts[2]] = true
-						}
+						files.Add(parts[2])
 					}
 				}
 			}
diff --git a/modules/issue/template/template.go b/modules/issue/template/template.go
index a4c0fb5aa6..3b33852cb5 100644
--- a/modules/issue/template/template.go
+++ b/modules/issue/template/template.go
@@ -11,6 +11,7 @@ import (
 	"strconv"
 	"strings"
 
+	"code.gitea.io/gitea/modules/container"
 	api "code.gitea.io/gitea/modules/structs"
 
 	"gitea.com/go-chi/binding"
@@ -43,7 +44,7 @@ func validateYaml(template *api.IssueTemplate) error {
 	if len(template.Fields) == 0 {
 		return fmt.Errorf("'body' is required")
 	}
-	ids := map[string]struct{}{}
+	ids := make(container.Set[string])
 	for idx, field := range template.Fields {
 		if err := validateID(field, idx, ids); err != nil {
 			return err
@@ -125,7 +126,7 @@ func validateRequired(field *api.IssueFormField, idx int) error {
 	return validateBoolItem(newErrorPosition(idx, field.Type), field.Validations, "required")
 }
 
-func validateID(field *api.IssueFormField, idx int, ids map[string]struct{}) error {
+func validateID(field *api.IssueFormField, idx int, ids container.Set[string]) error {
 	if field.Type == api.IssueFormFieldTypeMarkdown {
 		// The ID is not required for a markdown field
 		return nil
@@ -139,10 +140,9 @@ func validateID(field *api.IssueFormField, idx int, ids map[string]struct{}) err
 	if binding.AlphaDashPattern.MatchString(field.ID) {
 		return position.Errorf("'id' should contain only alphanumeric, '-' and '_'")
 	}
-	if _, ok := ids[field.ID]; ok {
+	if !ids.Add(field.ID) {
 		return position.Errorf("'id' should be unique")
 	}
-	ids[field.ID] = struct{}{}
 	return nil
 }
 
diff --git a/modules/markup/markdown/goldmark.go b/modules/markup/markdown/goldmark.go
index 24f1ab7a01..8417019ddb 100644
--- a/modules/markup/markdown/goldmark.go
+++ b/modules/markup/markdown/goldmark.go
@@ -10,6 +10,7 @@ import (
 	"regexp"
 	"strings"
 
+	"code.gitea.io/gitea/modules/container"
 	"code.gitea.io/gitea/modules/markup"
 	"code.gitea.io/gitea/modules/markup/common"
 	"code.gitea.io/gitea/modules/setting"
@@ -198,7 +199,7 @@ func (g *ASTTransformer) Transform(node *ast.Document, reader text.Reader, pc pa
 }
 
 type prefixedIDs struct {
-	values map[string]bool
+	values container.Set[string]
 }
 
 // Generate generates a new element id.
@@ -219,14 +220,12 @@ func (p *prefixedIDs) GenerateWithDefault(value, dft []byte) []byte {
 	if !bytes.HasPrefix(result, []byte("user-content-")) {
 		result = append([]byte("user-content-"), result...)
 	}
-	if _, ok := p.values[util.BytesToReadOnlyString(result)]; !ok {
-		p.values[util.BytesToReadOnlyString(result)] = true
+	if p.values.Add(util.BytesToReadOnlyString(result)) {
 		return result
 	}
 	for i := 1; ; i++ {
 		newResult := fmt.Sprintf("%s-%d", result, i)
-		if _, ok := p.values[newResult]; !ok {
-			p.values[newResult] = true
+		if p.values.Add(newResult) {
 			return []byte(newResult)
 		}
 	}
@@ -234,12 +233,12 @@ func (p *prefixedIDs) GenerateWithDefault(value, dft []byte) []byte {
 
 // Put puts a given element id to the used ids table.
 func (p *prefixedIDs) Put(value []byte) {
-	p.values[util.BytesToReadOnlyString(value)] = true
+	p.values.Add(util.BytesToReadOnlyString(value))
 }
 
 func newPrefixedIDs() *prefixedIDs {
 	return &prefixedIDs{
-		values: map[string]bool{},
+		values: make(container.Set[string]),
 	}
 }
 
diff --git a/modules/notification/ui/ui.go b/modules/notification/ui/ui.go
index 5e5196a70a..4d96a6b0ed 100644
--- a/modules/notification/ui/ui.go
+++ b/modules/notification/ui/ui.go
@@ -10,6 +10,7 @@ import (
 	issues_model "code.gitea.io/gitea/models/issues"
 	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/container"
 	"code.gitea.io/gitea/modules/graceful"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/notification/base"
@@ -123,14 +124,14 @@ func (ns *notificationService) NotifyNewPullRequest(pr *issues_model.PullRequest
 		log.Error("Unable to load issue: %d for pr: %d: Error: %v", pr.IssueID, pr.ID, err)
 		return
 	}
-	toNotify := make(map[int64]struct{}, 32)
+	toNotify := make(container.Set[int64], 32)
 	repoWatchers, err := repo_model.GetRepoWatchersIDs(db.DefaultContext, pr.Issue.RepoID)
 	if err != nil {
 		log.Error("GetRepoWatchersIDs: %v", err)
 		return
 	}
 	for _, id := range repoWatchers {
-		toNotify[id] = struct{}{}
+		toNotify.Add(id)
 	}
 	issueParticipants, err := issues_model.GetParticipantsIDsByIssueID(pr.IssueID)
 	if err != nil {
@@ -138,11 +139,11 @@ func (ns *notificationService) NotifyNewPullRequest(pr *issues_model.PullRequest
 		return
 	}
 	for _, id := range issueParticipants {
-		toNotify[id] = struct{}{}
+		toNotify.Add(id)
 	}
 	delete(toNotify, pr.Issue.PosterID)
 	for _, mention := range mentions {
-		toNotify[mention.ID] = struct{}{}
+		toNotify.Add(mention.ID)
 	}
 	for receiverID := range toNotify {
 		_ = ns.issueQueue.Push(issueNotificationOpts{
diff --git a/modules/public/public.go b/modules/public/public.go
index 7804e945e7..ac1d80c860 100644
--- a/modules/public/public.go
+++ b/modules/public/public.go
@@ -11,6 +11,7 @@ import (
 	"path/filepath"
 	"strings"
 
+	"code.gitea.io/gitea/modules/container"
 	"code.gitea.io/gitea/modules/httpcache"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
@@ -83,11 +84,11 @@ func AssetsHandlerFunc(opts *Options) http.HandlerFunc {
 }
 
 // parseAcceptEncoding parse Accept-Encoding: deflate, gzip;q=1.0, *;q=0.5 as compress methods
-func parseAcceptEncoding(val string) map[string]bool {
+func parseAcceptEncoding(val string) container.Set[string] {
 	parts := strings.Split(val, ";")
-	types := make(map[string]bool)
+	types := make(container.Set[string])
 	for _, v := range strings.Split(parts[0], ",") {
-		types[strings.TrimSpace(v)] = true
+		types.Add(strings.TrimSpace(v))
 	}
 	return types
 }
diff --git a/modules/public/public_test.go b/modules/public/public_test.go
index 430e734564..8b58d6af33 100644
--- a/modules/public/public_test.go
+++ b/modules/public/public_test.go
@@ -7,28 +7,23 @@ package public
 import (
 	"testing"
 
+	"code.gitea.io/gitea/modules/container"
+
 	"github.com/stretchr/testify/assert"
 )
 
 func TestParseAcceptEncoding(t *testing.T) {
 	kases := []struct {
 		Header   string
-		Expected map[string]bool
+		Expected container.Set[string]
 	}{
 		{
-			Header: "deflate, gzip;q=1.0, *;q=0.5",
-			Expected: map[string]bool{
-				"deflate": true,
-				"gzip":    true,
-			},
+			Header:   "deflate, gzip;q=1.0, *;q=0.5",
+			Expected: container.SetOf("deflate", "gzip"),
 		},
 		{
-			Header: " gzip, deflate, br",
-			Expected: map[string]bool{
-				"deflate": true,
-				"gzip":    true,
-				"br":      true,
-			},
+			Header:   " gzip, deflate, br",
+			Expected: container.SetOf("deflate", "gzip", "br"),
 		},
 	}
 
diff --git a/modules/public/serve_static.go b/modules/public/serve_static.go
index 9666880adf..10120bf85d 100644
--- a/modules/public/serve_static.go
+++ b/modules/public/serve_static.go
@@ -60,7 +60,7 @@ func AssetIsDir(name string) (bool, error) {
 // serveContent serve http content
 func serveContent(w http.ResponseWriter, req *http.Request, fi os.FileInfo, modtime time.Time, content io.ReadSeeker) {
 	encodings := parseAcceptEncoding(req.Header.Get("Accept-Encoding"))
-	if encodings["gzip"] {
+	if encodings.Contains("gzip") {
 		if cf, ok := fi.(*vfsgen۰CompressedFileInfo); ok {
 			rdGzip := bytes.NewReader(cf.GzipBytes())
 			// all static files are managed by Gitea, so we can make sure every file has the correct ext name
diff --git a/modules/queue/unique_queue_channel.go b/modules/queue/unique_queue_channel.go
index 6e8d37a20c..d1bf7239eb 100644
--- a/modules/queue/unique_queue_channel.go
+++ b/modules/queue/unique_queue_channel.go
@@ -12,6 +12,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	"code.gitea.io/gitea/modules/container"
 	"code.gitea.io/gitea/modules/json"
 	"code.gitea.io/gitea/modules/log"
 )
@@ -33,7 +34,7 @@ type ChannelUniqueQueueConfiguration ChannelQueueConfiguration
 type ChannelUniqueQueue struct {
 	*WorkerPool
 	lock               sync.Mutex
-	table              map[string]bool
+	table              container.Set[string]
 	shutdownCtx        context.Context
 	shutdownCtxCancel  context.CancelFunc
 	terminateCtx       context.Context
@@ -58,7 +59,7 @@ func NewChannelUniqueQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue
 	shutdownCtx, shutdownCtxCancel := context.WithCancel(terminateCtx)
 
 	queue := &ChannelUniqueQueue{
-		table:              map[string]bool{},
+		table:              make(container.Set[string]),
 		shutdownCtx:        shutdownCtx,
 		shutdownCtxCancel:  shutdownCtxCancel,
 		terminateCtx:       terminateCtx,
@@ -73,7 +74,7 @@ func NewChannelUniqueQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue
 			bs, _ := json.Marshal(datum)
 
 			queue.lock.Lock()
-			delete(queue.table, string(bs))
+			queue.table.Remove(string(bs))
 			queue.lock.Unlock()
 
 			if u := handle(datum); u != nil {
@@ -127,16 +128,15 @@ func (q *ChannelUniqueQueue) PushFunc(data Data, fn func() error) error {
 			q.lock.Unlock()
 		}
 	}()
-	if _, ok := q.table[string(bs)]; ok {
+	if !q.table.Add(string(bs)) {
 		return ErrAlreadyInQueue
 	}
 	// FIXME: We probably need to implement some sort of limit here
 	// If the downstream queue blocks this table will grow without limit
-	q.table[string(bs)] = true
 	if fn != nil {
 		err := fn()
 		if err != nil {
-			delete(q.table, string(bs))
+			q.table.Remove(string(bs))
 			return err
 		}
 	}
@@ -155,8 +155,7 @@ func (q *ChannelUniqueQueue) Has(data Data) (bool, error) {
 
 	q.lock.Lock()
 	defer q.lock.Unlock()
-	_, has := q.table[string(bs)]
-	return has, nil
+	return q.table.Contains(string(bs)), nil
 }
 
 // Flush flushes the channel with a timeout - the Flush worker will be registered as a flush worker with the manager
diff --git a/modules/repository/repo.go b/modules/repository/repo.go
index 48c3edf60f..b01be322d2 100644
--- a/modules/repository/repo.go
+++ b/modules/repository/repo.go
@@ -18,6 +18,7 @@ import (
 	"code.gitea.io/gitea/models/organization"
 	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/container"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/lfs"
 	"code.gitea.io/gitea/modules/log"
@@ -275,7 +276,7 @@ func SyncReleasesWithTags(repo *repo_model.Repository, gitRepo *git.Repository)
 		return pullMirrorReleaseSync(repo, gitRepo)
 	}
 
-	existingRelTags := make(map[string]struct{})
+	existingRelTags := make(container.Set[string])
 	opts := repo_model.FindReleasesOptions{
 		IncludeDrafts: true,
 		IncludeTags:   true,
@@ -303,14 +304,14 @@ func SyncReleasesWithTags(repo *repo_model.Repository, gitRepo *git.Repository)
 					return fmt.Errorf("unable to PushUpdateDeleteTag: %q in Repo[%d:%s/%s]: %w", rel.TagName, repo.ID, repo.OwnerName, repo.Name, err)
 				}
 			} else {
-				existingRelTags[strings.ToLower(rel.TagName)] = struct{}{}
+				existingRelTags.Add(strings.ToLower(rel.TagName))
 			}
 		}
 	}
 
 	_, err := gitRepo.WalkReferences(git.ObjectTag, 0, 0, func(sha1, refname string) error {
 		tagName := strings.TrimPrefix(refname, git.TagPrefix)
-		if _, ok := existingRelTags[strings.ToLower(tagName)]; ok {
+		if existingRelTags.Contains(strings.ToLower(tagName)) {
 			return nil
 		}
 
diff --git a/modules/setting/queue.go b/modules/setting/queue.go
index cb86cbdfe0..d3bb33b248 100644
--- a/modules/setting/queue.go
+++ b/modules/setting/queue.go
@@ -9,6 +9,7 @@ import (
 	"strconv"
 	"time"
 
+	"code.gitea.io/gitea/modules/container"
 	"code.gitea.io/gitea/modules/log"
 
 	ini "gopkg.in/ini.v1"
@@ -109,8 +110,8 @@ func NewQueueService() {
 	// Now handle the old issue_indexer configuration
 	// FIXME: DEPRECATED to be removed in v1.18.0
 	section := Cfg.Section("queue.issue_indexer")
-	directlySet := toDirectlySetKeysMap(section)
-	if !directlySet["TYPE"] && defaultType == "" {
+	directlySet := toDirectlySetKeysSet(section)
+	if !directlySet.Contains("TYPE") && defaultType == "" {
 		switch typ := Cfg.Section("indexer").Key("ISSUE_INDEXER_QUEUE_TYPE").MustString(""); typ {
 		case "levelqueue":
 			_, _ = section.NewKey("TYPE", "level")
@@ -124,25 +125,25 @@ func NewQueueService() {
 			log.Fatal("Unsupported indexer queue type: %v", typ)
 		}
 	}
-	if !directlySet["LENGTH"] {
+	if !directlySet.Contains("LENGTH") {
 		length := Cfg.Section("indexer").Key("UPDATE_BUFFER_LEN").MustInt(0)
 		if length != 0 {
 			_, _ = section.NewKey("LENGTH", strconv.Itoa(length))
 		}
 	}
-	if !directlySet["BATCH_LENGTH"] {
+	if !directlySet.Contains("BATCH_LENGTH") {
 		fallback := Cfg.Section("indexer").Key("ISSUE_INDEXER_QUEUE_BATCH_NUMBER").MustInt(0)
 		if fallback != 0 {
 			_, _ = section.NewKey("BATCH_LENGTH", strconv.Itoa(fallback))
 		}
 	}
-	if !directlySet["DATADIR"] {
+	if !directlySet.Contains("DATADIR") {
 		queueDir := filepath.ToSlash(Cfg.Section("indexer").Key("ISSUE_INDEXER_QUEUE_DIR").MustString(""))
 		if queueDir != "" {
 			_, _ = section.NewKey("DATADIR", queueDir)
 		}
 	}
-	if !directlySet["CONN_STR"] {
+	if !directlySet.Contains("CONN_STR") {
 		connStr := Cfg.Section("indexer").Key("ISSUE_INDEXER_QUEUE_CONN_STR").MustString("")
 		if connStr != "" {
 			_, _ = section.NewKey("CONN_STR", connStr)
@@ -178,19 +179,19 @@ func handleOldLengthConfiguration(queueName, oldSection, oldKey string, defaultV
 	}
 
 	section := Cfg.Section("queue." + queueName)
-	directlySet := toDirectlySetKeysMap(section)
-	if !directlySet["LENGTH"] {
+	directlySet := toDirectlySetKeysSet(section)
+	if !directlySet.Contains("LENGTH") {
 		_, _ = section.NewKey("LENGTH", strconv.Itoa(value))
 	}
 }
 
-// toDirectlySetKeysMap returns a bool map of keys directly set by this section
+// toDirectlySetKeysSet returns a set of keys directly set by this section
 // Note: we cannot use section.HasKey(...) as that will immediately set the Key if a parent section has the Key
 // but this section does not.
-func toDirectlySetKeysMap(section *ini.Section) map[string]bool {
-	sectionMap := map[string]bool{}
+func toDirectlySetKeysSet(section *ini.Section) container.Set[string] {
+	sections := make(container.Set[string])
 	for _, key := range section.Keys() {
-		sectionMap[key.Name()] = true
+		sections.Add(key.Name())
 	}
-	return sectionMap
+	return sections
 }
diff --git a/modules/setting/setting.go b/modules/setting/setting.go
index 6233437bf5..007e3ef61f 100644
--- a/modules/setting/setting.go
+++ b/modules/setting/setting.go
@@ -21,6 +21,7 @@ import (
 	"text/template"
 	"time"
 
+	"code.gitea.io/gitea/modules/container"
 	"code.gitea.io/gitea/modules/json"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/user"
@@ -234,7 +235,7 @@ var (
 		DefaultTheme          string
 		Themes                []string
 		Reactions             []string
-		ReactionsMap          map[string]bool `ini:"-"`
+		ReactionsLookup       container.Set[string] `ini:"-"`
 		CustomEmojis          []string
 		CustomEmojisMap       map[string]string `ini:"-"`
 		SearchRepoDescription bool
@@ -1100,9 +1101,9 @@ func loadFromConf(allowEmpty bool, extraConfig string) {
 
 	newMarkup()
 
-	UI.ReactionsMap = make(map[string]bool)
+	UI.ReactionsLookup = make(container.Set[string])
 	for _, reaction := range UI.Reactions {
-		UI.ReactionsMap[reaction] = true
+		UI.ReactionsLookup.Add(reaction)
 	}
 	UI.CustomEmojisMap = make(map[string]string)
 	for _, emoji := range UI.CustomEmojis {
diff --git a/modules/sync/status_pool.go b/modules/sync/status_pool.go
index acbd93ab17..99e5ce9cb3 100644
--- a/modules/sync/status_pool.go
+++ b/modules/sync/status_pool.go
@@ -6,6 +6,8 @@ package sync
 
 import (
 	"sync"
+
+	"code.gitea.io/gitea/modules/container"
 )
 
 // StatusTable is a table maintains true/false values.
@@ -14,13 +16,13 @@ import (
 // in different goroutines.
 type StatusTable struct {
 	lock sync.RWMutex
-	pool map[string]struct{}
+	pool container.Set[string]
 }
 
 // NewStatusTable initializes and returns a new StatusTable object.
 func NewStatusTable() *StatusTable {
 	return &StatusTable{
-		pool: make(map[string]struct{}),
+		pool: make(container.Set[string]),
 	}
 }
 
@@ -28,32 +30,29 @@ func NewStatusTable() *StatusTable {
 // Returns whether set value was set to true
 func (p *StatusTable) StartIfNotRunning(name string) bool {
 	p.lock.Lock()
-	_, ok := p.pool[name]
-	if !ok {
-		p.pool[name] = struct{}{}
-	}
+	added := p.pool.Add(name)
 	p.lock.Unlock()
-	return !ok
+	return added
 }
 
 // Start sets value of given name to true in the pool.
 func (p *StatusTable) Start(name string) {
 	p.lock.Lock()
-	p.pool[name] = struct{}{}
+	p.pool.Add(name)
 	p.lock.Unlock()
 }
 
 // Stop sets value of given name to false in the pool.
 func (p *StatusTable) Stop(name string) {
 	p.lock.Lock()
-	delete(p.pool, name)
+	p.pool.Remove(name)
 	p.lock.Unlock()
 }
 
 // IsRunning checks if value of given name is set to true in the pool.
 func (p *StatusTable) IsRunning(name string) bool {
 	p.lock.RLock()
-	_, ok := p.pool[name]
+	exists := p.pool.Contains(name)
 	p.lock.RUnlock()
-	return ok
+	return exists
 }