[GITEA] notifies admins on new user registration (squash) performance bottleneck

Refs: https://codeberg.org/forgejo/forgejo/issues/1479
(cherry picked from commit 97ac9147ff)
(cherry picked from commit 19f295c16b)

models/user/user.go

@@ -223,6 +223,12 @@ func GetAllUsers(ctx context.Context) ([]*User, error) {
 	return users, db.GetEngine(ctx).OrderBy("id").Where("type = ?", UserTypeIndividual).Find(&users)
 }
 
+// GetAllAdmins returns a slice of all adminusers found in DB.
+func GetAllAdmins(ctx context.Context) ([]*User, error) {
+	users := make([]*User, 0)
+	return users, db.GetEngine(ctx).OrderBy("id").Where("type = ?", UserTypeIndividual).And("is_admin = ?", true).Find(&users)
+}
+
 // IsLocal returns true if user login type is LoginPlain.
 func (u *User) IsLocal() bool {
 	return u.LoginType <= auth.Plain

models/user/user_test.go

@@ -544,3 +544,13 @@ func Test_ValidateUser(t *testing.T) {
 		assert.EqualValues(t, expected, err == nil, fmt.Sprintf("case: %+v", kase))
 	}
 }
+
+func TestGetAllAdmins(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	admins, err := user_model.GetAllAdmins(db.DefaultContext)
+	assert.NoError(t, err)
+
+	assert.Len(t, admins, 1)
+	assert.Equal(t, int64(1), admins[0].ID)
+}

services/mailer/mail_admin_new_user.go

@@ -32,17 +32,15 @@ func MailNewUser(ctx context.Context, u *user_model.User) {
 		return
 	}
 
-	recipients, err := user_model.GetAllUsers(ctx)
+	recipients, err := user_model.GetAllAdmins(ctx)
 	if err != nil {
-		log.Error("user_model.GetAllUsers: %v", err)
+		log.Error("user_model.GetAllAdmins: %v", err)
 		return
 	}
 
 	langMap := make(map[string][]string)
 	for _, r := range recipients {
-		if r.IsAdmin {
+		langMap[r.Language] = append(langMap[r.Language], r.Email)
-			langMap[r.Language] = append(langMap[r.Language], r.Email)
-		}
 	}
 
 	for lang, tos := range langMap {