forked from maddyblue/sqlfmt
-
Notifications
You must be signed in to change notification settings - Fork 0
/
jsonpb_marshal.go
executable file
·138 lines (121 loc) · 4.15 KB
/
jsonpb_marshal.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
// Copyright 2016 The Cockroach Authors.
//
// Use of this software is governed by the Business Source License
// included in the file licenses/BSL.txt.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0, included in the file
// licenses/APL.txt.
package protoutil
import (
"bytes"
"encoding/json"
"fmt"
"io"
"reflect"
"github.com/cockroachdb/errors"
"github.com/gogo/protobuf/jsonpb"
"github.com/gogo/protobuf/proto"
gwruntime "github.com/grpc-ecosystem/grpc-gateway/runtime"
)
var _ gwruntime.Marshaler = (*JSONPb)(nil)
var typeProtoMessage = reflect.TypeOf((*proto.Message)(nil)).Elem()
// JSONPb is a gwruntime.Marshaler that uses github.com/gogo/protobuf/jsonpb.
type JSONPb jsonpb.Marshaler
// ContentType implements gwruntime.Marshaler.
func (*JSONPb) ContentType() string {
// NB: This is the same as httputil.JSONContentType which we can't use due to
// an import cycle.
const JSONContentType = "application/json"
return JSONContentType
}
// Marshal implements gwruntime.Marshaler.
func (j *JSONPb) Marshal(v interface{}) ([]byte, error) {
return j.marshal(v)
}
// a lower-case version of marshal to allow for a call from
// marshalNonProtoField without upsetting TestProtoMarshal().
func (j *JSONPb) marshal(v interface{}) ([]byte, error) {
// NB: we use proto.Message here because grpc-gateway passes us protos that
// we don't control and thus don't implement protoutil.Message.
if pb, ok := v.(proto.Message); ok {
var buf bytes.Buffer
marshalFn := (*jsonpb.Marshaler)(j).Marshal
if err := marshalFn(&buf, pb); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
return j.marshalNonProtoField(v)
}
// Cribbed verbatim from grpc-gateway.
type protoEnum interface {
fmt.Stringer
EnumDescriptor() ([]byte, []int)
}
// Cribbed verbatim from grpc-gateway.
func (j *JSONPb) marshalNonProtoField(v interface{}) ([]byte, error) {
rv := reflect.ValueOf(v)
for rv.Kind() == reflect.Ptr {
if rv.IsNil() {
return []byte("null"), nil
}
rv = rv.Elem()
}
if rv.Kind() == reflect.Map {
m := make(map[string]*json.RawMessage)
for _, k := range rv.MapKeys() {
buf, err := j.marshal(rv.MapIndex(k).Interface())
if err != nil {
return nil, err
}
m[fmt.Sprintf("%v", k.Interface())] = (*json.RawMessage)(&buf)
}
if j.Indent != "" {
return json.MarshalIndent(m, "", j.Indent)
}
return json.Marshal(m)
}
if enum, ok := rv.Interface().(protoEnum); ok && !j.EnumsAsInts {
return json.Marshal(enum.String())
}
return json.Marshal(rv.Interface())
}
// Unmarshal implements gwruntime.Marshaler.
func (j *JSONPb) Unmarshal(data []byte, v interface{}) error {
// NB: we use proto.Message here because grpc-gateway passes us protos that
// we don't control and thus don't implement protoutil.Message.
if pb, ok := v.(proto.Message); ok {
return jsonpb.Unmarshal(bytes.NewReader(data), pb)
}
return errors.Errorf("unexpected type %T does not implement %s", v, typeProtoMessage)
}
// NewDecoder implements gwruntime.Marshaler.
func (j *JSONPb) NewDecoder(r io.Reader) gwruntime.Decoder {
return gwruntime.DecoderFunc(func(v interface{}) error {
// NB: we use proto.Message here because grpc-gateway passes us protos that
// we don't control and thus don't implement protoutil.Message.
if pb, ok := v.(proto.Message); ok {
return jsonpb.Unmarshal(r, pb)
}
return errors.Errorf("unexpected type %T does not implement %s", v, typeProtoMessage)
})
}
// NewEncoder implements gwruntime.Marshaler.
func (j *JSONPb) NewEncoder(w io.Writer) gwruntime.Encoder {
return gwruntime.EncoderFunc(func(v interface{}) error {
// NB: we use proto.Message here because grpc-gateway passes us protos that
// we don't control and thus don't implement protoutil.Message.
if pb, ok := v.(proto.Message); ok {
marshalFn := (*jsonpb.Marshaler)(j).Marshal
return marshalFn(w, pb)
}
return errors.Errorf("unexpected type %T does not implement %s", v, typeProtoMessage)
})
}
var _ gwruntime.Delimited = (*JSONPb)(nil)
// Delimiter implements gwruntime.Delimited.
func (*JSONPb) Delimiter() []byte {
return []byte("\n")
}