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-rw-r--r--models/system/appstate.go56
1 files changed, 56 insertions, 0 deletions
diff --git a/models/system/appstate.go b/models/system/appstate.go
new file mode 100644
index 0000000..01faa1a
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+++ b/models/system/appstate.go
@@ -0,0 +1,56 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package system
+
+import (
+ "context"
+
+ "code.gitea.io/gitea/models/db"
+)
+
+// AppState represents a state record in database
+// if one day we would make Gitea run as a cluster,
+// we can introduce a new field `Scope` here to store different states for different nodes
+type AppState struct {
+ ID string `xorm:"pk varchar(200)"`
+ Revision int64
+ Content string `xorm:"LONGTEXT"`
+}
+
+func init() {
+ db.RegisterModel(new(AppState))
+}
+
+// SaveAppStateContent saves the app state item to database
+func SaveAppStateContent(ctx context.Context, key, content string) error {
+ return db.WithTx(ctx, func(ctx context.Context) error {
+ eng := db.GetEngine(ctx)
+ // try to update existing row
+ res, err := eng.Exec("UPDATE app_state SET revision=revision+1, content=? WHERE id=?", content, key)
+ if err != nil {
+ return err
+ }
+ rows, _ := res.RowsAffected()
+ if rows != 0 {
+ // the existing row is updated, so we can return
+ return nil
+ }
+ // if no existing row, insert a new row
+ _, err = eng.Insert(&AppState{ID: key, Content: content})
+ return err
+ })
+}
+
+// GetAppStateContent gets an app state from database
+func GetAppStateContent(ctx context.Context, key string) (content string, err error) {
+ e := db.GetEngine(ctx)
+ appState := &AppState{ID: key}
+ has, err := e.Get(appState)
+ if err != nil {
+ return "", err
+ } else if !has {
+ return "", nil
+ }
+ return appState.Content, nil
+}