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common.go
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common.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package sql
import (
"bytes"
"encoding/binary"
"encoding/gob"
"fmt"
"github.com/go-sql-driver/mysql"
workflow "github.com/uber/cadence/.gen/go/shared"
"github.com/uber/cadence/common/log"
"github.com/uber/cadence/common/persistence"
"github.com/uber/cadence/common/persistence/sql/storage/sqldb"
)
// TODO: Rename all SQL Managers to Stores
type sqlStore struct {
db sqldb.Interface
logger log.Logger
}
func (m *sqlStore) GetName() string {
return m.db.DriverName()
}
func (m *sqlStore) Close() {
if m.db != nil {
m.db.Close()
}
}
func (m *sqlStore) txExecute(operation string, f func(tx sqldb.Tx) error) error {
tx, err := m.db.BeginTx()
if err != nil {
return &workflow.InternalServiceError{
Message: fmt.Sprintf("%s failed. Failed to start transaction. Error: %v", operation, err),
}
}
err = f(tx)
if err != nil {
tx.Rollback()
switch err.(type) {
case *persistence.ConditionFailedError,
*persistence.CurrentWorkflowConditionFailedError,
*workflow.InternalServiceError,
*persistence.WorkflowExecutionAlreadyStartedError,
*workflow.DomainAlreadyExistsError,
*persistence.ShardOwnershipLostError:
return err
default:
return &workflow.InternalServiceError{
Message: fmt.Sprintf("%v: %v", operation, err),
}
}
}
if err := tx.Commit(); err != nil {
return &workflow.InternalServiceError{
Message: fmt.Sprintf("%s operation failed. Failed to commit transaction. Error: %v", operation, err),
}
}
return nil
}
// ErrDupEntry MySQL Error 1062 indicates a duplicate primary key i.e. the row already exists,
// so we don't do the insert and return a ConditionalUpdate error.
const ErrDupEntry = 1062
func isDupEntry(err error) bool {
sqlErr, ok := err.(*mysql.MySQLError)
return ok && sqlErr.Number == ErrDupEntry
}
func gobSerialize(x interface{}) ([]byte, error) {
b := bytes.Buffer{}
e := gob.NewEncoder(&b)
err := e.Encode(x)
if err != nil {
return nil, &workflow.InternalServiceError{
Message: fmt.Sprintf("Error in serialization: %v", err),
}
}
return b.Bytes(), nil
}
func gobDeserialize(a []byte, x interface{}) error {
b := bytes.NewBuffer(a)
d := gob.NewDecoder(b)
err := d.Decode(x)
if err != nil {
return &workflow.InternalServiceError{
Message: fmt.Sprintf("Error in deserialization: %v", err),
}
}
return nil
}
func boolToInt64(b bool) int64 {
if b {
return 1
}
return 0
}
func int64ToBool(i int64) bool {
if i == 0 {
return false
}
return true
}
func takeAddressIfNotNil(a []byte) *[]byte {
if a != nil {
return &a
}
return nil
}
func dereferenceIfNotNil(a *[]byte) []byte {
if a != nil {
return *a
}
return nil
}
func serializePageToken(offset int64) []byte {
b := make([]byte, 8)
binary.LittleEndian.PutUint64(b, uint64(offset))
return b
}
func deserializePageToken(payload []byte) (int64, error) {
if len(payload) != 8 {
return 0, fmt.Errorf("Invalid token of %v length", len(payload))
}
return int64(binary.LittleEndian.Uint64(payload)), nil
}