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db.go
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db.go
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// The MIT License
//
// Copyright (c) 2020 Temporal Technologies Inc. All rights reserved.
//
// Copyright (c) 2020 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 mysql
import (
"context"
"fmt"
"github.com/go-sql-driver/mysql"
"github.com/jmoiron/sqlx"
"go.temporal.io/server/common/persistence/schema"
"go.temporal.io/server/common/persistence/sql/sqlplugin"
mysqlschema "go.temporal.io/server/schema/mysql"
)
// db represents a logical connection to mysql database
type db struct {
dbKind sqlplugin.DbKind
dbName string
db *sqlx.DB
tx *sqlx.Tx
conn sqlplugin.Conn
converter DataConverter
}
var _ sqlplugin.AdminDB = (*db)(nil)
var _ sqlplugin.DB = (*db)(nil)
var _ sqlplugin.Tx = (*db)(nil)
// ErrDupEntryCode 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 ErrDupEntryCode = 1062
func (mdb *db) IsDupEntryError(err error) bool {
sqlErr, ok := err.(*mysql.MySQLError)
return ok && sqlErr.Number == ErrDupEntryCode
}
// newDB returns an instance of DB, which is a logical
// connection to the underlying mysql database
func newDB(
dbKind sqlplugin.DbKind,
dbName string,
xdb *sqlx.DB,
tx *sqlx.Tx,
) *db {
mdb := &db{
dbKind: dbKind,
dbName: dbName,
db: xdb,
tx: tx,
}
mdb.conn = xdb
if tx != nil {
mdb.conn = tx
}
mdb.converter = &converter{}
return mdb
}
// BeginTx starts a new transaction and returns a reference to the Tx object
func (mdb *db) BeginTx(ctx context.Context) (sqlplugin.Tx, error) {
xtx, err := mdb.db.BeginTxx(ctx, nil)
if err != nil {
return nil, err
}
return newDB(mdb.dbKind, mdb.dbName, mdb.db, xtx), nil
}
// Commit commits a previously started transaction
func (mdb *db) Commit() error {
return mdb.tx.Commit()
}
// Rollback triggers rollback of a previously started transaction
func (mdb *db) Rollback() error {
return mdb.tx.Rollback()
}
// Close closes the connection to the mysql db
func (mdb *db) Close() error {
return mdb.db.Close()
}
// PluginName returns the name of the mysql plugin
func (mdb *db) PluginName() string {
return PluginName
}
// ExpectedVersion returns expected version.
func (mdb *db) ExpectedVersion() string {
switch mdb.dbKind {
case sqlplugin.DbKindMain:
return mysqlschema.Version
case sqlplugin.DbKindVisibility:
return mysqlschema.VisibilityVersion
default:
panic(fmt.Sprintf("unknown db kind %v", mdb.dbKind))
}
}
// VerifyVersion verify schema version is up to date
func (mdb *db) VerifyVersion() error {
expectedVersion := mdb.ExpectedVersion()
return schema.VerifyCompatibleVersion(mdb, mdb.dbName, expectedVersion)
}