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json.go
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json.go
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// Copyright 2020-2021 Dolthub, Inc.
//
// 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 sql
import (
"encoding/json"
"github.com/dolthub/vitess/go/sqltypes"
"github.com/dolthub/vitess/go/vt/proto/query"
"gopkg.in/src-d/go-errors.v1"
)
var ErrConvertingToJSON = errors.NewKind("value %v is not valid JSON")
var JSON JsonType = jsonType{}
type JsonType interface {
Type
}
type jsonType struct{}
// Compare implements Type interface.
func (t jsonType) Compare(a interface{}, b interface{}) (int, error) {
var err error
if a, err = t.Convert(a); err != nil {
return 0, err
}
if b, err = t.Convert(b); err != nil {
return 0, err
}
// todo: making a context here is expensive
return a.(JSONValue).Compare(NewEmptyContext(), b.(JSONValue))
}
// Convert implements Type interface.
func (t jsonType) Convert(v interface{}) (doc interface{}, err error) {
switch v := v.(type) {
case JSONValue:
return v, nil
case []byte:
err = json.Unmarshal(v, &doc)
case string:
err = json.Unmarshal([]byte(v), &doc)
default:
// if |v| can be marshalled, it contains
// a valid JSON document representation
if _, err = json.Marshal(v); err == nil {
return JSONDocument{Val: v}, nil
}
}
if err != nil {
return nil, err
}
return JSONDocument{Val: doc}, nil
}
// Promote implements the Type interface.
func (t jsonType) Promote() Type {
return t
}
// SQL implements Type interface.
func (t jsonType) SQL(v interface{}) (sqltypes.Value, error) {
if v == nil {
return sqltypes.NULL, nil
}
js, ok := v.(JSONValue)
if !ok {
return sqltypes.NULL, nil
}
// todo: making a context here is expensive
s, err := js.ToString(NewEmptyContext())
if err != nil {
return sqltypes.NULL, err
}
return sqltypes.MakeTrusted(sqltypes.TypeJSON, []byte(s)), nil
}
// String implements Type interface.
func (t jsonType) String() string {
return "JSON"
}
// Type implements Type interface.
func (t jsonType) Type() query.Type {
return sqltypes.TypeJSON
}
// Zero implements Type interface.
func (t jsonType) Zero() interface{} {
// JSON Null
return nil
}