fix the Postgres database transaction cannot continue to execute afte…

…r failure (#50)

pkg/datastore/database.go

@@ -4,11 +4,13 @@ import (
 	"xorm.io/xorm"
 
 	"github.com/mayswind/ezbookkeeping/pkg/core"
+	"github.com/mayswind/ezbookkeeping/pkg/settings"
 )
 
 // Database represents a database instance
 type Database struct {
-	engineGroup *xorm.EngineGroup
+	databaseType string
+	engineGroup  *xorm.EngineGroup
 }
 
 // NewSession starts a new session with the specified context
@@ -41,3 +43,23 @@ func (db *Database) DoTransaction(c core.Context, fn func(sess *xorm.Session) er
 
 	return nil
 }
+
+// SetSavePoint sets a save point in the current transaction for Postgres
+func (db *Database) SetSavePoint(sess *xorm.Session, savePointName string) error {
+	if db.databaseType == settings.PostgresDbType {
+		_, err := sess.Exec("SAVEPOINT " + savePointName)
+		return err
+	}
+
+	return nil
+}
+
+// RollbackToSavePoint rolls back to the specified save point in the current transaction for Postgres
+func (db *Database) RollbackToSavePoint(sess *xorm.Session, savePointName string) error {
+	if db.databaseType == settings.PostgresDbType {
+		_, err := sess.Exec("ROLLBACK TO SAVEPOINT " + savePointName)
+		return err
+	}
+
+	return nil
+}

pkg/datastore/datastore_container.go

@@ -104,7 +104,8 @@ func initializeDatabase(dbConfig *settings.DatabaseConfig) (*Database, error) {
 	engineGroup.SetConnMaxLifetime(time.Duration(dbConfig.ConnectionMaxLifeTime) * time.Second)
 
 	return &Database{
-		engineGroup: engineGroup,
+		databaseType: dbConfig.DatabaseType,
+		engineGroup:  engineGroup,
 	}, nil
 }
 

pkg/services/accounts.go

@@ -9,6 +9,7 @@ import (
 	"github.com/mayswind/ezbookkeeping/pkg/core"
 	"github.com/mayswind/ezbookkeeping/pkg/datastore"
 	"github.com/mayswind/ezbookkeeping/pkg/errs"
+	"github.com/mayswind/ezbookkeeping/pkg/log"
 	"github.com/mayswind/ezbookkeeping/pkg/models"
 	"github.com/mayswind/ezbookkeeping/pkg/utils"
 	"github.com/mayswind/ezbookkeeping/pkg/uuid"
@@ -270,7 +271,9 @@ func (s *AccountService) CreateAccounts(c core.Context, mainAccount *models.Acco
 		}
 	}
 
-	return s.UserDataDB(mainAccount.Uid).DoTransaction(c, func(sess *xorm.Session) error {
+	userDataDb := s.UserDataDB(mainAccount.Uid)
+
+	return userDataDb.DoTransaction(c, func(sess *xorm.Session) error {
 		for i := 0; i < len(allAccounts); i++ {
 			account := allAccounts[i]
 			_, err := sess.Insert(account)
@@ -282,9 +285,25 @@ func (s *AccountService) CreateAccounts(c core.Context, mainAccount *models.Acco
 
 		for i := 0; i < len(allInitTransactions); i++ {
 			transaction := allInitTransactions[i]
+
+			insertTransactionSavePointName := "insert_transaction"
+			err := userDataDb.SetSavePoint(sess, insertTransactionSavePointName)
+
+			if err != nil {
+				log.Errorf(c, "[accounts.CreateAccounts] failed to set save point \"%s\", because %s", insertTransactionSavePointName, err.Error())
+				return err
+			}
+
 			createdRows, err := sess.Insert(transaction)
 
 			if err != nil || createdRows < 1 { // maybe another transaction has same time
+				err = userDataDb.RollbackToSavePoint(sess, insertTransactionSavePointName)
+
+				if err != nil {
+					log.Errorf(c, "[accounts.CreateAccounts] failed to rollback to save point \"%s\", because %s", insertTransactionSavePointName, err.Error())
+					return err
+				}
+
 				sameSecondLatestTransaction := &models.Transaction{}
 				minTransactionTime := utils.GetMinTransactionTimeFromUnixTime(utils.GetUnixTimeFromTransactionTime(transaction.TransactionTime))
 				maxTransactionTime := utils.GetMaxTransactionTimeFromUnixTime(utils.GetUnixTimeFromTransactionTime(transaction.TransactionTime))

pkg/services/transactions.go

@@ -252,8 +252,10 @@ func (s *TransactionService) CreateTransaction(c core.Context, transaction *mode
 		UpdatedUnixTime: now,
 	}
 
-	return s.UserDataDB(transaction.Uid).DoTransaction(c, func(sess *xorm.Session) error {
-		return s.doCreateTransaction(c, sess, transaction, transactionTagIndexes, tagIds, pictureIds, pictureUpdateModel)
+	userDataDb := s.UserDataDB(transaction.Uid)
+
+	return userDataDb.DoTransaction(c, func(sess *xorm.Session) error {
+		return s.doCreateTransaction(c, userDataDb, sess, transaction, transactionTagIndexes, tagIds, pictureIds, pictureUpdateModel)
 	})
 }
 
@@ -355,12 +357,14 @@ func (s *TransactionService) BatchCreateTransactions(c core.Context, uid int64,
 		allTransactionTagIds[transaction.TransactionId] = uniqueTagIds
 	}
 
-	return s.UserDataDB(uid).DoTransaction(c, func(sess *xorm.Session) error {
+	userDataDb := s.UserDataDB(uid)
+
+	return userDataDb.DoTransaction(c, func(sess *xorm.Session) error {
 		for i := 0; i < len(transactions); i++ {
 			transaction := transactions[i]
 			transactionTagIndexes := allTransactionTagIndexes[transaction.TransactionId]
 			transactionTagIds := allTransactionTagIds[transaction.TransactionId]
-			err := s.doCreateTransaction(c, sess, transaction, transactionTagIndexes, transactionTagIds, nil, nil)
+			err := s.doCreateTransaction(c, userDataDb, sess, transaction, transactionTagIndexes, transactionTagIds, nil, nil)
 
 			if err != nil {
 				transactionUnixTime := utils.GetUnixTimeFromTransactionTime(transaction.TransactionTime)
@@ -1562,7 +1566,7 @@ func (s *TransactionService) GetTransactionIds(transactions []*models.Transactio
 	return transactionIds
 }
 
-func (s *TransactionService) doCreateTransaction(c core.Context, sess *xorm.Session, transaction *models.Transaction, transactionTagIndexes []*models.TransactionTagIndex, tagIds []int64, pictureIds []int64, pictureUpdateModel *models.TransactionPictureInfo) error {
+func (s *TransactionService) doCreateTransaction(c core.Context, database *datastore.Database, sess *xorm.Session, transaction *models.Transaction, transactionTagIndexes []*models.TransactionTagIndex, tagIds []int64, pictureIds []int64, pictureUpdateModel *models.TransactionPictureInfo) error {
 	// Get and verify source and destination account
 	sourceAccount, destinationAccount, err := s.getAccountModels(sess, transaction)
 
@@ -1646,6 +1650,14 @@ func (s *TransactionService) doCreateTransaction(c core.Context, sess *xorm.Sess
 		relatedTransaction = s.GetRelatedTransferTransaction(transaction)
 	}
 
+	insertTransactionSavePointName := "insert_transaction"
+	err = database.SetSavePoint(sess, insertTransactionSavePointName)
+
+	if err != nil {
+		log.Errorf(c, "[transactions.doCreateTransaction] failed to set save point \"%s\", because %s", insertTransactionSavePointName, err.Error())
+		return err
+	}
+
 	createdRows, err := sess.Insert(transaction)
 
 	if err != nil || createdRows < 1 { // maybe another transaction has same time
@@ -1655,6 +1667,13 @@ func (s *TransactionService) doCreateTransaction(c core.Context, sess *xorm.Sess
 			log.Warnf(c, "[transactions.doCreateTransaction] cannot create trasaction, regenerate transaction time value")
 		}
 
+		err = database.RollbackToSavePoint(sess, insertTransactionSavePointName)
+
+		if err != nil {
+			log.Errorf(c, "[transactions.doCreateTransaction] failed to rollback to save point \"%s\", because %s", insertTransactionSavePointName, err.Error())
+			return err
+		}
+
 		sameSecondLatestTransaction := &models.Transaction{}
 		minTransactionTime := utils.GetMinTransactionTimeFromUnixTime(utils.GetUnixTimeFromTransactionTime(transaction.TransactionTime))
 		maxTransactionTime := utils.GetMaxTransactionTimeFromUnixTime(utils.GetUnixTimeFromTransactionTime(transaction.TransactionTime))