-
Notifications
You must be signed in to change notification settings - Fork 4
/
message.go
170 lines (144 loc) · 3.6 KB
/
message.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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
package nrpc
import (
"context"
"fmt"
spb "google.golang.org/genproto/googleapis/rpc/status"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/proto"
)
type recvMsg struct {
ctx context.Context
data []byte
req *Request
}
func (m *recvMsg) request() (*Request, error) {
if m.req != nil {
return m.req, nil
}
var req Request
if r := proto.Unmarshal(m.data, &req); r != nil {
return nil, r
}
m.req = &req
return m.req, nil
}
type respMsg struct {
ctx context.Context
data []byte
}
func marshalProto(subj string, args proto.Message, msgType MessageType) ([]byte, error) {
innerPayload, err := proto.Marshal(args)
if err != nil {
return nil, err
}
payload, err := proto.Marshal(&Message{
Subject: subj,
Data: innerPayload,
Type: msgType,
})
if err != nil {
return nil, err
}
return payload, nil
}
func marshalReqMsg(ctx context.Context, args proto.Message, reqSubj, respSubj string, timeout int64) ([]byte, error) {
innerPayload, err := proto.Marshal(args)
if err != nil {
return nil, err
}
md, _ := metadata.FromOutgoingContext(ctx)
return proto.Marshal(&Request{
Header: fromMD(md),
Data: innerPayload,
ReqSubject: reqSubj,
RespSubject: respSubj,
Timeout: timeout,
})
}
func marshalRespMsg(resp proto.Message, header metadata.MD, trailer metadata.MD, eos bool, headerOnly bool) ([]byte, []byte, error) {
innerPayload, err := proto.Marshal(resp)
if err != nil {
return nil, nil, err
}
payload, err := proto.Marshal(&Response{
Header: fromMD(header),
Trailer: fromMD(trailer),
HeaderOnly: headerOnly,
Data: innerPayload,
Eos: eos,
})
return innerPayload, payload, err
}
func marshalUnaryRespMsg(subj string, resp proto.Message, header metadata.MD, trailer metadata.MD, eos bool, headerOnly bool) ([]byte, []byte, error) {
innerPayload, err := proto.Marshal(resp)
if err != nil {
return nil, nil, err
}
payload, err := marshalProto(subj, &Response{
Header: fromMD(header),
Trailer: fromMD(trailer),
HeaderOnly: headerOnly,
Data: innerPayload,
Eos: eos,
}, MessageType_Data)
return innerPayload, payload, err
}
func marshalEOS() ([]byte, error) {
return proto.Marshal(&Request{
Eos: true,
})
}
func unmarshalReq(data []byte) (*Request, error) {
var req Request
if r := proto.Unmarshal(data, &req); r != nil {
return nil, r
}
return &req, nil
}
func unmarshalRespMsg(data []byte, target interface{}) (*Response, error) {
var resp Response
if r := proto.Unmarshal(data, &resp); r != nil {
return nil, r
}
// nolint: forcetypeassert
return &resp, proto.Unmarshal(resp.GetData(), target.(proto.Message))
}
func unmarshalUnaryRespMsg(data []byte, target interface{}) (*Response, error) {
var msg Message
if r := proto.Unmarshal(data, &msg); r != nil {
return nil, r
}
if msg.GetType() == MessageType_Error {
return nil, unmarshalErr(msg.GetData())
}
var resp Response
if r := proto.Unmarshal(msg.GetData(), &resp); r != nil {
return nil, r
}
// nolint: forcetypeassert
return &resp, proto.Unmarshal(resp.GetData(), target.(proto.Message))
}
func unmarshalErr(data []byte) error {
var stats spb.Status
if r := proto.Unmarshal(data, &stats); r != nil {
return fmt.Errorf("unable to unmarshal error: %w", r)
}
return status.ErrorProto(&stats)
}
func toMD(header map[string]*Header) metadata.MD {
h := metadata.MD{}
for k, v := range header {
h[k] = v.Values
}
return h
}
func fromMD(header metadata.MD) map[string]*Header {
h := map[string]*Header{}
for k, v := range header {
h[k] = &Header{
Values: v,
}
}
return h
}