Use session for rolling back

gogs.go

 // Test that go1.2 tag above is included in builds. main.go refers to this definition.
 const go12tag = true
 
-const APP_VER = "0.2.0.0403 Alpha"
+const APP_VER = "0.2.0.0404 Alpha"
 
 func init() {
 	base.AppVer = APP_VER

models/access.go

 import (
 	"strings"
 	"time"
+
+	"github.com/lunny/xorm"
 )
 
 // Access types.
 	return err
 }
 
+// UpdateAccess updates access information with session for rolling back.
+func UpdateAccessWithSession(sess *xorm.Session, access *Access) error {
+	if _, err := sess.Id(access.Id).Update(access); err != nil {
+		sess.Rollback()
+		return err
+	}
+	return nil
+}
+
 // HasAccess returns true if someone can read or write to given repository.
 func HasAccess(userName, repoName string, mode int) (bool, error) {
 	return orm.Get(&Access{

models/repo.go

 	if err = orm.Find(&accesses, &Access{RepoName: user.LowerName + "/" + repo.LowerName}); err != nil {
 		return err
 	}
+
+	sess := orm.NewSession()
+	defer sess.Close()
+	if err = sess.Begin(); err != nil {
+		return err
+	}
+
 	for i := range accesses {
 		accesses[i].RepoName = newUser.LowerName + "/" + repo.LowerName
 		if accesses[i].UserName == user.LowerName {
 			accesses[i].UserName = newUser.LowerName
 		}
-		if err = UpdateAccess(&accesses[i]); err != nil {
+		if err = UpdateAccessWithSession(sess, &accesses[i]); err != nil {
 			return err
 		}
 	}
 
 	// Update repository.
 	repo.OwnerId = newUser.Id
-	if _, err := orm.Id(repo.Id).Update(repo); err != nil {
+	if _, err := sess.Id(repo.Id).Update(repo); err != nil {
+		sess.Rollback()
 		return err
 	}
 
 	// Update user repository number.
 	rawSql := "UPDATE `user` SET num_repos = num_repos + 1 WHERE id = ?"
-	if _, err = orm.Exec(rawSql, newUser.Id); err != nil {
+	if _, err = sess.Exec(rawSql, newUser.Id); err != nil {
+		sess.Rollback()
 		return err
 	}
 	rawSql = "UPDATE `user` SET num_repos = num_repos - 1 WHERE id = ?"
-	if _, err = orm.Exec(rawSql, user.Id); err != nil {
+	if _, err = sess.Exec(rawSql, user.Id); err != nil {
+		sess.Rollback()
 		return err
 	}
 
 	// Add watch of new owner to repository.
 	if !IsWatching(newUser.Id, repo.Id) {
 		if err = WatchRepo(newUser.Id, repo.Id, true); err != nil {
+			sess.Rollback()
 			return err
 		}
 	}
 
 	if err = TransferRepoAction(user, newUser, repo); err != nil {
+		sess.Rollback()
 		return err
 	}
 
 	// Change repository directory name.
-	return os.Rename(RepoPath(user.Name, repo.Name), RepoPath(newUser.Name, repo.Name))
+	if err = os.Rename(RepoPath(user.Name, repo.Name), RepoPath(newUser.Name, repo.Name)); err != nil {
+		sess.Rollback()
+		return err
+	}
+
+	return sess.Commit()
 }
 
 // ChangeRepositoryName changes all corresponding setting from old repository name to new one.
 	if err = orm.Find(&accesses, &Access{RepoName: strings.ToLower(userName + "/" + oldRepoName)}); err != nil {
 		return err
 	}
+
+	sess := orm.NewSession()
+	defer sess.Close()
+	if err = sess.Begin(); err != nil {
+		return err
+	}
+
 	for i := range accesses {
 		accesses[i].RepoName = userName + "/" + newRepoName
-		if err = UpdateAccess(&accesses[i]); err != nil {
+		if err = UpdateAccessWithSession(sess, &accesses[i]); err != nil {
 			return err
 		}
 	}
 
 	// Change repository directory name.
-	return os.Rename(RepoPath(userName, oldRepoName), RepoPath(userName, newRepoName))
+	if err = os.Rename(RepoPath(userName, oldRepoName), RepoPath(userName, newRepoName)); err != nil {
+		sess.Rollback()
+		return err
+	}
+
+	return sess.Commit()
 }
 
 func UpdateRepository(repo *Repository) error {

models/user.go

 	if err = orm.Find(&accesses, &Access{UserName: user.LowerName}); err != nil {
 		return err
 	}
+
+	sess := orm.NewSession()
+	defer sess.Close()
+	if err = sess.Begin(); err != nil {
+		return err
+	}
+
 	for i := range accesses {
 		accesses[i].UserName = newUserName
 		if strings.HasPrefix(accesses[i].RepoName, user.LowerName+"/") {
 			accesses[i].RepoName = strings.Replace(accesses[i].RepoName, user.LowerName, newUserName, 1)
-			if err = UpdateAccess(&accesses[i]); err != nil {
+			if err = UpdateAccessWithSession(sess, &accesses[i]); err != nil {
 				return err
 			}
 		}
 
 		for j := range accesses {
 			accesses[j].RepoName = newUserName + "/" + repos[i].LowerName
-			if err = UpdateAccess(&accesses[j]); err != nil {
+			if err = UpdateAccessWithSession(sess, &accesses[j]); err != nil {
 				return err
 			}
 		}
 	}
 
 	// Change user directory name.
-	return os.Rename(UserPath(user.LowerName), UserPath(newUserName))
+	if err = os.Rename(UserPath(user.LowerName), UserPath(newUserName)); err != nil {
+		sess.Rollback()
+		return err
+	}
+
+	return sess.Commit()
 }
 
 // UpdateUser updates user's information.