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// Copyright 2024 Google LLC
//
// 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 mysql defines the IssuanceChainStorage type, which implements IssuanceChainStorage interface with FindByKey and Add methods.
package mysql
import (
"context"
"database/sql"
"errors"
"strings"
"k8s.io/klog/v2"
"github.com/go-sql-driver/mysql"
)
const (
selectIssuanceChainByKeySQL = "SELECT c.ChainValue FROM IssuanceChain AS c WHERE c.IdentityHash = ?"
insertIssuanceChainSQL = "INSERT INTO IssuanceChain(IdentityHash, ChainValue) VALUES (?, ?)"
)
// IssuanceChainStorage is a MySQL implementation of the IssuanceChainStorage interface.
type IssuanceChainStorage struct {
db *sql.DB
}
// NewIssuanceChainStorage takes the database connection string as the input and return the IssuanceChainStorage.
func NewIssuanceChainStorage(ctx context.Context, dbConn string) *IssuanceChainStorage {
db, err := open(ctx, dbConn)
if err != nil {
klog.Exitf("failed to open database: %v", err)
}
return &IssuanceChainStorage{
db: db,
}
}
// FindByKey returns the key-value pair of issuance chain by the key.
func (s *IssuanceChainStorage) FindByKey(ctx context.Context, key []byte) ([]byte, error) {
row := s.db.QueryRowContext(ctx, selectIssuanceChainByKeySQL, key)
if err := row.Err(); err != nil {
return nil, err
}
var chain []byte
if err := row.Scan(&chain); err != nil {
return nil, err
}
return chain, nil
}
// Add inserts the key-value pair of issuance chain.
func (s *IssuanceChainStorage) Add(ctx context.Context, key []byte, chain []byte) error {
_, err := s.db.ExecContext(ctx, insertIssuanceChainSQL, key, chain)
if err != nil {
// Ignore duplicated key error.
var mysqlErr *mysql.MySQLError
if errors.As(err, &mysqlErr) && mysqlErr.Number == 1062 {
return nil
}
return err
}
return nil
}
// open takes the data source name and returns the sql.DB object.
func open(ctx context.Context, dataSourceName string) (*sql.DB, error) {
// Verify data source name format.
conn := strings.Split(dataSourceName, "://")
if len(conn) != 2 {
return nil, errors.New("could not parse MySQL data source name")
}
if conn[0] != "mysql" {
return nil, errors.New("expect data source name to start with mysql")
}
db, err := sql.Open("mysql", conn[1])
if err != nil {
// Don't log data source name as it could contain credentials.
klog.Errorf("could not open MySQL database, check config: %s", err)
return nil, err
}
// Enable strict SQL mode to ensure consistent behaviour among different storage engines when handling invalid or missing values in data-change statements.
if _, err := db.ExecContext(ctx, "SET sql_mode = 'STRICT_ALL_TABLES'"); err != nil {
klog.Warningf("failed to set strict mode on mysql db: %s", err)
return nil, err
}
return db, nil
}
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