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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 storage defines the IssuanceChainStorage type, which allows different storage implementation for the key-value pairs of issuance chains.
package storage
import (
"context"
"errors"
"strings"
"github.com/google/certificate-transparency-go/trillian/ctfe/configpb"
"github.com/google/certificate-transparency-go/trillian/ctfe/storage/mysql"
"github.com/google/certificate-transparency-go/trillian/ctfe/storage/postgresql"
)
// IssuanceChainStorage is an interface which allows CTFE binaries to use different storage implementations for issuance chains.
type IssuanceChainStorage interface {
// FindByKey returns the issuance chain associated with the provided key.
FindByKey(ctx context.Context, key []byte) ([]byte, error)
// Add inserts the key-value pair of issuance chain.
Add(ctx context.Context, key []byte, chain []byte) error
}
// NewIssuanceChainStorage returns nil for Trillian gRPC, or mysql.IssuanceChainStorage or postgresql.IssuanceChainStorage
// when mysql or postgres is the prefix in database connection string.
func NewIssuanceChainStorage(ctx context.Context, backend configpb.LogConfig_IssuanceChainStorageBackend, dbConn string) (IssuanceChainStorage, error) {
switch backend {
case configpb.LogConfig_ISSUANCE_CHAIN_STORAGE_BACKEND_TRILLIAN_GRPC:
return nil, nil
case configpb.LogConfig_ISSUANCE_CHAIN_STORAGE_BACKEND_CTFE:
if strings.HasPrefix(dbConn, "mysql") {
return mysql.NewIssuanceChainStorage(ctx, dbConn), nil
} else if strings.HasPrefix(dbConn, "postgres") {
return postgresql.NewIssuanceChainStorage(ctx, dbConn), nil
}
return nil, errors.New("failed to initialise IssuanceChainService due to unsupported driver in CTFE storage connection string")
}
return nil, errors.New("unsupported issuance chain storage backend")
}
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