/
metadata.go
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/
metadata.go
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// Copyright 2020 Asim Aslam
//
// 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
//
// https://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.
//
// Original source: github.com/micro/go-plugins/v3/store/cockroach/metadata.go
package postgres
import (
"database/sql/driver"
"encoding/json"
"errors"
)
// https://github.com/upper/db/blob/master/postgresql/custom_types.go#L43
type Metadata map[string]interface{}
// Scan satisfies the sql.Scanner interface.
func (m *Metadata) Scan(src interface{}) error {
source, ok := src.([]byte)
if !ok {
return errors.New("Type assertion .([]byte) failed.")
}
var i interface{}
err := json.Unmarshal(source, &i)
if err != nil {
return err
}
*m, ok = i.(map[string]interface{})
if !ok {
return errors.New("Type assertion .(map[string]interface{}) failed.")
}
return nil
}
// Value satisfies the driver.Valuer interface.
func (m Metadata) Value() (driver.Value, error) {
j, err := json.Marshal(m)
return j, err
}
func toMetadata(m *Metadata) map[string]interface{} {
md := make(map[string]interface{})
for k, v := range *m {
md[k] = v
}
return md
}