-
Notifications
You must be signed in to change notification settings - Fork 0
/
rpc.go
231 lines (203 loc) · 4.82 KB
/
rpc.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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
package rpcgo
import (
"context"
)
var logger Logger
func InitLogger(l Logger) {
logger = l
}
/*
* 注意,传递给RPC模块的所有回调函数可能在底层信道的接收/发送goroutine上执行,
* 为了避免接收/发送goroutine被阻塞,回调函数中不能调用阻塞函数。
* 如需调用阻塞函数,请在回调中启动一个goroutine来执行
*/
type Error struct {
code int
str string
}
func NewError(code int, err string) *Error {
if code <= 0 || code >= errEnd {
return nil
} else {
return &Error{code: code, str: err}
}
}
func (e *Error) Error() string {
return e.str
}
func (e *Error) Is(code int) bool {
return e.code == code
}
const (
ErrOk = iota
ErrInvaildMethod
ErrTimeout
ErrCancel
ErrMethod
ErrOther
ErrServiceUnavaliable
ErrDisconnet
errEnd
)
type RequestMsg struct {
Seq uint64
Method string
Arg []byte
UserData []byte
Oneway bool
arg interface{}
}
func (r RequestMsg) GetArg() interface{} {
return r.arg
}
type ResponseMsg struct {
Seq uint64
Err *Error
Ret []byte
UserData []byte
}
const (
lenSeq = 8
lenOneWay = 1
lenMethod = 2
lenUserData = 2
lenErrCode = 2
lenErrStr = 2
maxUserData = 65536
maxMethodLen = 65536
maxErrStrLen = 65536
reqHdrLen = lenSeq + lenOneWay + lenMethod + lenUserData // seq + oneway + len(method) + len(userdata)
respHdrLen = lenSeq + lenErrCode + lenUserData //seq + Error.Err.Code + len(userdata)
)
func EncodeRequest(req *RequestMsg) []byte {
method := []byte(req.Method)
if len(method) > maxMethodLen {
method = method[:maxMethodLen]
}
lenUserdata := len(req.UserData)
if len(req.UserData) > maxUserData {
lenUserdata = maxUserData
req.UserData = req.UserData[:lenUserdata]
}
bw := BytesWriter{
B: make([]byte, 0, reqHdrLen+len(method)+lenUserdata+len(req.Arg)),
}
//seq
bw.WriteUint64(req.Seq)
//oneway
bw.WriteBool(req.Oneway)
//method
bw.WriteBytes(method)
//userdata
bw.WriteBytes(req.UserData)
//arg
bw.WriteBytes(req.Arg)
return bw.B
}
func DecodeRequest(buff []byte) (*RequestMsg, error) {
var req RequestMsg
var err error
br := BytesReader{
B: buff,
}
if req.Seq, err = br.ReadUint64(); err != nil {
return nil, err
}
if req.Oneway, err = br.ReadBool(); err != nil {
return nil, err
}
if req.Method, err = br.ReadString(); err != nil {
return nil, err
}
if req.UserData, err = br.ReadBytes(); err != nil {
return nil, err
}
if req.Arg, err = br.ReadBytes(); err != nil {
return nil, err
}
return &req, nil
}
func EncodeResponse(resp *ResponseMsg) []byte {
var errByte []byte
var bw BytesWriter
lenUserdata := len(resp.UserData)
if len(resp.UserData) > maxUserData {
lenUserdata = maxUserData
resp.UserData = resp.UserData[:lenUserdata]
}
if resp.Err == nil {
bw.B = make([]byte, 0, respHdrLen+len(resp.Ret)+lenUserdata)
} else {
errByte = []byte(resp.Err.str)
if len(errByte) > maxErrStrLen {
errByte = errByte[:maxErrStrLen]
}
bw.B = make([]byte, 0, respHdrLen+lenErrStr+len(errByte)+len(resp.Ret)+lenUserdata)
}
//seq
bw.WriteUint64(resp.Seq)
//usedata
bw.WriteBytes(resp.UserData)
//err
if resp.Err != nil {
bw.WriteUint16(uint16(resp.Err.code))
bw.WriteBytes(errByte)
} else {
bw.WriteUint16(uint16(0))
}
//ret
bw.WriteBytes(resp.Ret)
return bw.B
}
func DecodeResponse(buff []byte) (*ResponseMsg, error) {
var resp ResponseMsg
var err error
var errCode uint16
var errStr string
br := BytesReader{
B: buff,
}
if resp.Seq, err = br.ReadUint64(); err != nil {
return nil, err
}
if resp.UserData, err = br.ReadBytes(); err != nil {
return nil, err
}
if errCode, err = br.ReadUint16(); err != nil {
return nil, err
}
if errCode != 0 {
if errStr, err = br.ReadString(); err != nil {
return nil, err
}
resp.Err = NewError(int(errCode), errStr)
}
if resp.Ret, err = br.ReadBytes(); err != nil {
return nil, err
}
return &resp, nil
}
// encode/decode Arg/Ret
type Codec interface {
Encode(interface{}) ([]byte, error)
Decode([]byte, interface{}) error
}
type Channel interface {
Request(*RequestMsg) error
RequestWithContext(context.Context, *RequestMsg) error
Reply(*ResponseMsg) error
Name() string
IsRetryAbleError(error) bool
}
/*
* 默认情况下不关注channel的断开事件,如果需要在channel断开的时候
* 快速中断等待中的RPC,使用者需要额外实现ChannelInterestDisconnect接口,自己管理调用上下文
*/
type PendingCall interface {
OnDisconnect()
}
type ChannelInterestDisconnect interface {
OnDisconnect()
PutPending(uint64, PendingCall)
LoadAndDeletePending(uint64) (interface{}, bool)
}