/
transaction_impl.go
119 lines (94 loc) · 2.71 KB
/
transaction_impl.go
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package neo4j
type neoTransaction struct {
session *neoSession
outcomeApplied bool
beginResult Result
}
// TransactionWork represents a unit of work that will be executed against the provided
// transaction
type TransactionWork func(tx Transaction) (interface{}, error)
func ensureTxState(transaction *neoTransaction) error {
if transaction.outcomeApplied {
return newDriverError("transaction is already committed or rolled back")
}
if transaction.session.runner == nil {
return newDriverError("transaction is closed")
}
return nil
}
func (transaction *neoTransaction) Commit() error {
if err := ensureTxState(transaction); err != nil {
return err
}
commit, err := transaction.session.runner.commitTransaction()
if err != nil {
return err
}
_, err = commit.Consume()
if err != nil {
return err
}
transaction.outcomeApplied = true
return nil
}
func (transaction *neoTransaction) Rollback() error {
if err := ensureTxState(transaction); err != nil {
return err
}
rollback, err := transaction.session.runner.rollbackTransaction()
if err != nil {
return err
}
_, err = rollback.Consume()
if err != nil {
return err
}
transaction.outcomeApplied = true
return nil
}
func (transaction *neoTransaction) Close() error {
if !transaction.outcomeApplied {
if err := transaction.Rollback(); err != nil {
return err
}
}
if err := closeRunner(transaction.session); err != nil {
return err
}
transaction.session.tx = nil
return nil
}
func (transaction *neoTransaction) Run(cypher string, params map[string]interface{}) (Result, error) {
return runStatementOnTransaction(transaction, &neoStatement{text: cypher, params: params})
}
func runStatementOnTransaction(transaction *neoTransaction, statement *neoStatement) (Result, error) {
if err := statement.validate(); err != nil {
return nil, err
}
if err := ensureTxState(transaction); err != nil {
return nil, err
}
result, err := transaction.session.runner.runStatement(statement, nil, TransactionConfig{})
if err != nil {
return nil, err
}
return result, nil
}