forked from gopcua/opcua
-
Notifications
You must be signed in to change notification settings - Fork 0
/
uacp.go
183 lines (160 loc) · 4.09 KB
/
uacp.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
171
172
173
174
175
176
177
178
179
180
181
182
183
// Copyright 2018-2020 opcua authors. All rights reserved.
// Use of this source code is governed by a MIT-style license that can be
// found in the LICENSE file.
package uacp
import (
"github.com/arvindh123/opcua/errors"
"github.com/arvindh123/opcua/ua"
)
// MessageType definitions.
//
// Specification: Part 6, 7.1.2.2
const (
MessageTypeHello = "HEL"
MessageTypeAcknowledge = "ACK"
MessageTypeError = "ERR"
MessageTypeReverseHello = "RHE"
)
// ChunkType definitions.
//
// Specification: Part 6, 6.7.2.2
const (
ChunkTypeIntermediate = 'C'
ChunkTypeFinal = 'F'
ChunkTypeAbort = 'A'
)
// Header represents a OPC UA Connection Header.
//
// Specification: Part 6, 7.1.2.2
type Header struct {
MessageType string
ChunkType byte
MessageSize uint32
}
func (h *Header) Decode(b []byte) (int, error) {
buf := ua.NewBuffer(b)
h.MessageType = string(buf.ReadN(3))
h.ChunkType = buf.ReadByte()
h.MessageSize = buf.ReadUint32()
return buf.Pos(), buf.Error()
}
func (h *Header) Encode() ([]byte, error) {
buf := ua.NewBuffer(nil)
if len(h.MessageType) != 3 {
return nil, errors.Errorf("invalid message type: %q", h.MessageType)
}
buf.Write([]byte(h.MessageType))
buf.WriteByte(h.ChunkType)
buf.WriteUint32(h.MessageSize)
return buf.Bytes(), buf.Error()
}
// Hello represents a OPC UA Hello.
//
// Specification: Part6, 7.1.2.3
type Hello struct {
Version uint32
ReceiveBufSize uint32
SendBufSize uint32
MaxMessageSize uint32
MaxChunkCount uint32
EndpointURL string
}
func (h *Hello) Decode(b []byte) (int, error) {
buf := ua.NewBuffer(b)
h.Version = buf.ReadUint32()
h.ReceiveBufSize = buf.ReadUint32()
h.SendBufSize = buf.ReadUint32()
h.MaxMessageSize = buf.ReadUint32()
h.MaxChunkCount = buf.ReadUint32()
h.EndpointURL = buf.ReadString()
return buf.Pos(), buf.Error()
}
func (h *Hello) Encode() ([]byte, error) {
buf := ua.NewBuffer(nil)
buf.WriteUint32(h.Version)
buf.WriteUint32(h.ReceiveBufSize)
buf.WriteUint32(h.SendBufSize)
buf.WriteUint32(h.MaxMessageSize)
buf.WriteUint32(h.MaxChunkCount)
buf.WriteString(h.EndpointURL)
return buf.Bytes(), buf.Error()
}
// Acknowledge represents a OPC UA Acknowledge.
//
// Specification: Part6, 7.1.2.4
type Acknowledge struct {
Version uint32
ReceiveBufSize uint32
SendBufSize uint32
MaxMessageSize uint32
MaxChunkCount uint32
}
func (a *Acknowledge) Decode(b []byte) (int, error) {
buf := ua.NewBuffer(b)
a.Version = buf.ReadUint32()
a.ReceiveBufSize = buf.ReadUint32()
a.SendBufSize = buf.ReadUint32()
a.MaxMessageSize = buf.ReadUint32()
a.MaxChunkCount = buf.ReadUint32()
return buf.Pos(), buf.Error()
}
func (a *Acknowledge) Encode() ([]byte, error) {
buf := ua.NewBuffer(nil)
buf.WriteUint32(a.Version)
buf.WriteUint32(a.ReceiveBufSize)
buf.WriteUint32(a.SendBufSize)
buf.WriteUint32(a.MaxMessageSize)
buf.WriteUint32(a.MaxChunkCount)
return buf.Bytes(), buf.Error()
}
// ReverseHello represents a OPC UA ReverseHello.
//
// Specification: Part6, 7.1.2.6
type ReverseHello struct {
ServerURI string
EndpointURL string
}
func (r *ReverseHello) Decode(b []byte) (int, error) {
buf := ua.NewBuffer(b)
r.ServerURI = buf.ReadString()
r.EndpointURL = buf.ReadString()
return buf.Pos(), buf.Error()
}
func (r *ReverseHello) Encode() ([]byte, error) {
buf := ua.NewBuffer(nil)
buf.WriteString(r.ServerURI)
buf.WriteString(r.EndpointURL)
return buf.Bytes(), buf.Error()
}
// Error represents a OPC UA Error.
//
// Specification: Part6, 7.1.2.5
type Error struct {
ErrorCode uint32
Reason string
}
func (e *Error) Decode(b []byte) (int, error) {
buf := ua.NewBuffer(b)
e.ErrorCode = buf.ReadUint32()
e.Reason = buf.ReadString()
return buf.Pos(), buf.Error()
}
func (e *Error) Encode() ([]byte, error) {
buf := ua.NewBuffer(nil)
buf.WriteUint32(e.ErrorCode)
buf.WriteString(e.Reason)
return buf.Bytes(), buf.Error()
}
func (e *Error) Error() string {
return ua.StatusCode(e.ErrorCode).Error()
}
type Message struct {
Data []byte
}
func (m *Message) Decode(b []byte) (int, error) {
m.Data = b
return len(b), nil
}
func (m *Message) Encode() ([]byte, error) {
return m.Data, nil
}