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serializer.go
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serializer.go
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// Copyright 2016-2022 Fraunhofer AISEC
//
// 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.
//
// $$\ $$\ $$\ $$\
// $$ | $$ |\__| $$ |
// $$$$$$$\ $$ | $$$$$$\ $$\ $$\ $$$$$$$ |$$\ $$$$$$\ $$$$$$\ $$$$$$\
// $$ _____|$$ |$$ __$$\ $$ | $$ |$$ __$$ |$$ |\_$$ _| $$ __$$\ $$ __$$\
// $$ / $$ |$$ / $$ |$$ | $$ |$$ / $$ |$$ | $$ | $$ / $$ |$$ | \__|
// $$ | $$ |$$ | $$ |$$ | $$ |$$ | $$ |$$ | $$ |$$\ $$ | $$ |$$ |
// \$$$$$$\ $$ |\$$$$$ |\$$$$$ |\$$$$$$ |$$ | \$$$ |\$$$$$ |$$ |
// \_______|\__| \______/ \______/ \_______|\__| \____/ \______/ \__|
//
// This file is part of Clouditor Community Edition.
package gorm
import (
"context"
"fmt"
"reflect"
"time"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/types/known/anypb"
"google.golang.org/protobuf/types/known/timestamppb"
"gorm.io/gorm/schema"
"clouditor.io/clouditor/persistence"
)
// TimestampSerializer is a GORM serializer that allows the serialization and deserialization of the
// google.protobuf.Timestamp protobuf message type.
type TimestampSerializer struct{}
// Value implements https://pkg.go.dev/gorm.io/gorm/schema#SerializerValuerInterface to indicate
// how this struct will be saved into an SQL database field.
func (TimestampSerializer) Value(_ context.Context, _ *schema.Field, _ reflect.Value, fieldValue interface{}) (interface{}, error) {
var (
t *timestamppb.Timestamp
ok bool
)
if fieldValue == nil {
return nil, nil
}
if t, ok = fieldValue.(*timestamppb.Timestamp); !ok {
return nil, persistence.ErrUnsupportedType
}
return t.AsTime(), nil
}
// Scan implements https://pkg.go.dev/gorm.io/gorm/schema#SerializerInterface to indicate how
// this struct can be loaded from an SQL database field.
func (TimestampSerializer) Scan(ctx context.Context, field *schema.Field, dst reflect.Value, dbValue interface{}) (err error) {
var t *timestamppb.Timestamp
if dbValue != nil {
switch v := dbValue.(type) {
case time.Time:
t = timestamppb.New(v)
default:
return persistence.ErrUnsupportedType
}
field.ReflectValueOf(ctx, dst).Set(reflect.ValueOf(t))
}
return
}
// AnySerializer is a GORM serializer that allows the serialization and deserialization of the
// google.protobuf.Any protobuf message type using a JSONB field.
type AnySerializer struct{}
// Value implements https://pkg.go.dev/gorm.io/gorm/schema#SerializerValuerInterface to indicate
// how this struct will be saved into an SQL database field.
func (AnySerializer) Value(_ context.Context, _ *schema.Field, _ reflect.Value, fieldValue interface{}) (interface{}, error) {
var (
a *anypb.Any
ok bool
)
if fieldValue == nil {
return nil, nil
}
if a, ok = fieldValue.(*anypb.Any); !ok {
return nil, persistence.ErrUnsupportedType
}
return protojson.Marshal(a)
}
// Scan implements https://pkg.go.dev/gorm.io/gorm/schema#SerializerInterface to indicate how
// this struct can be loaded from an SQL database field.
func (AnySerializer) Scan(ctx context.Context, field *schema.Field, dst reflect.Value, dbValue interface{}) (err error) {
var (
a anypb.Any
)
if dbValue != nil {
var bytes []byte
switch v := dbValue.(type) {
case []byte:
bytes = v
case string:
bytes = []byte(v)
default:
return persistence.ErrUnsupportedType
}
err = protojson.Unmarshal(bytes, &a)
if err != nil {
return fmt.Errorf("could not unmarshal JSONB value into protobuf message: %w", err)
}
}
field.ReflectValueOf(ctx, dst).Set(reflect.ValueOf(&a))
return
}