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Allow operation with less privileged user #46

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1 change: 1 addition & 0 deletions database/notsupported.go
Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
//nolint:revive // ignore unused parameters because these are stubs
package database

// NotSupportedDB is a db implementation used on database drivers when the
Expand Down
35 changes: 31 additions & 4 deletions mysql/mysql.go
Original file line number Diff line number Diff line change
Expand Up @@ -44,10 +44,22 @@ func (db *DB) Open(dataSourceName string, opt ...database.Option) error {
if err != nil {
return errors.Wrap(err, "error connecting to mysql")
}
_, err = _db.Exec(fmt.Sprintf("CREATE DATABASE IF NOT EXISTS `%s`", opts.Database))
rows, err := _db.Query(fmt.Sprintf("SHOW DATABASES LIKE '%s'", opts.Database))
if err != nil {
return errors.Wrapf(err, "error creating database %s (if not exists)", opts.Database)
return errors.Wrapf(err, "error checking if database %s exists", opts.Database)
}
defer rows.Close()
// db doesn't exist, create it
if !rows.Next() {
_, err = _db.Exec(fmt.Sprintf("CREATE DATABASE IF NOT EXISTS `%s`", opts.Database))
if err != nil {
return errors.Wrapf(err, "error creating database %s (if not exists)", opts.Database)
}
}
if err = rows.Err(); err != nil {
return fmt.Errorf("error accessing databases: %w", err)
}

parsedDSN.DBName = opts.Database
db.db, err = sql.Open("mysql", parsedDSN.FormatDSN())
if err != nil {
Expand Down Expand Up @@ -82,6 +94,10 @@ func createTableQry(bucket []byte) string {
return fmt.Sprintf("CREATE TABLE IF NOT EXISTS `%s`(nkey VARBINARY(255), nvalue BLOB, PRIMARY KEY (nkey));", bucket)
}

func checkTableQry(bucket []byte) string {
return fmt.Sprintf("SHOW TABLES LIKE '%s';", bucket)
}

func deleteTableQry(bucket []byte) string {
return fmt.Sprintf("DROP TABLE `%s`", bucket)
}
Expand Down Expand Up @@ -261,9 +277,20 @@ func (db *DB) Update(tx *database.Tx) error {

// CreateTable creates a table in the database.
func (db *DB) CreateTable(bucket []byte) error {
_, err := db.db.Exec(createTableQry(bucket))
rows, err := db.db.Query(checkTableQry(bucket))
if err != nil {
return errors.Wrapf(err, "failed to create table %s", bucket)
return errors.Wrapf(err, "failed to check table %s", bucket)
}
defer rows.Close()
// Table doesn't exist, create it.
if !rows.Next() {
_, err := db.db.Exec(createTableQry(bucket))
if err != nil {
return errors.Wrapf(err, "failed to create table %s", bucket)
}
}
if err = rows.Err(); err != nil {
return errors.Wrap(err, "error accessing row")
}
return nil
}
Expand Down
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