forked from streamingfast/solana-go
/
reconnect.go
268 lines (214 loc) · 5.2 KB
/
reconnect.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
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
package ws
import (
"errors"
"fmt"
"math/rand"
"net/http"
"net/url"
"sync"
"time"
"github.com/gorilla/websocket"
"github.com/jpillora/backoff"
"go.uber.org/zap"
)
var (
ErrNotConnected = errors.New("websocket not connected")
ErrUrlEmpty = errors.New("url can not be empty")
ErrUrlWrongScheme = errors.New("websocket uri must start with ws or wss scheme")
ErrUrlNamePassNotAllowed = errors.New("user name and password are not allowed in websocket uri")
// ErrCantConnect = errors.New("websocket can't connect")
)
type WsOpts func(dl *websocket.Dialer)
type Websocket struct {
// Websocket ID
Id uint64
// Websocket Meta
Meta map[string]interface{}
Logger *zap.Logger
Errors chan<- error
Reconnect bool
// default to 2 seconds
ReconnectIntervalMin time.Duration
// default to 30 seconds
ReconnectIntervalMax time.Duration
// interval, default to 1.5
ReconnectIntervalFactor float64
// default to 2 seconds
HandshakeTimeout time.Duration
// Verbose suppress connecting/reconnecting messages.
Verbose bool
// Cal function
OnConnect func(ws *Websocket)
OnDisconnect func(ws *Websocket)
OnConnectError func(ws *Websocket, err error)
OnDisconnectError func(ws *Websocket, err error)
OnReadError func(ws *Websocket, err error)
OnWriteError func(ws *Websocket, err error)
dialer *websocket.Dialer
url string
requestHeader http.Header
httpResponse *http.Response
mu sync.Mutex
dialErr error
isConnected bool
isClosed bool
*websocket.Conn
}
func (ws *Websocket) WriteJSON(v interface{}) error {
err := ErrNotConnected
if ws.IsConnected() {
err = ws.Conn.WriteJSON(v)
if err != nil {
if ws.OnWriteError != nil {
ws.OnWriteError(ws, err)
}
ws.closeAndReconnect()
}
}
return err
}
func (ws *Websocket) WriteMessage(messageType int, data []byte) error {
err := ErrNotConnected
if ws.IsConnected() {
ws.mu.Lock()
defer ws.mu.Unlock()
err = ws.Conn.WriteMessage(messageType, data)
if err != nil {
if ws.OnWriteError != nil {
ws.OnWriteError(ws, err)
}
ws.closeAndReconnect()
}
}
return err
}
func (ws *Websocket) ReadMessage() (messageType int, message []byte, err error) {
err = ErrNotConnected
if ws.IsConnected() {
messageType, message, err = ws.Conn.ReadMessage()
if err != nil {
if ws.OnReadError != nil {
ws.OnReadError(ws, err)
}
ws.closeAndReconnect()
}
}
return messageType, message, err
}
func (ws *Websocket) Close() {
ws.mu.Lock()
defer ws.mu.Unlock()
if ws.Conn != nil {
err := ws.Conn.Close()
if err == nil && ws.isConnected && ws.OnDisconnect != nil {
ws.OnDisconnect(ws)
}
if err != nil && ws.OnDisconnectError != nil {
ws.OnDisconnectError(ws, err)
}
}
ws.isConnected = false
}
func (ws *Websocket) closeAndReconnect() {
ws.Close()
ws.Connect()
}
func (ws *Websocket) Dial(urlStr string) error {
_, err := parseUrl(urlStr)
if err != nil {
return err
}
ws.url = urlStr
ws.setDefaults()
ws.dialer = &websocket.Dialer{
Proxy: http.ProxyFromEnvironment,
HandshakeTimeout: ws.HandshakeTimeout,
}
hs := ws.HandshakeTimeout
go ws.Connect()
// wait on first attempt
time.Sleep(hs)
return nil
}
func (ws *Websocket) Connect() {
b := &backoff.Backoff{
Min: ws.ReconnectIntervalMin,
Max: ws.ReconnectIntervalMax,
Factor: ws.ReconnectIntervalFactor,
Jitter: true,
}
// seed rand for backoff
rand.Seed(time.Now().UTC().UnixNano())
for {
nextInterval := b.Duration()
wsConn, httpResp, err := ws.dialer.Dial(ws.url, ws.requestHeader)
ws.mu.Lock()
ws.Conn = wsConn
ws.dialErr = err
ws.isConnected = err == nil
ws.httpResponse = httpResp
ws.mu.Unlock()
if err == nil {
if ws.Verbose && ws.Logger != nil {
ws.Logger.Info(fmt.Sprintf("Websocket[%d].Dial: connection was successfully established with %s\n", ws.Id, ws.url))
}
if ws.OnConnect != nil {
ws.OnConnect(ws)
}
return
} else {
if ws.Verbose && ws.Logger != nil {
ws.Logger.Error(fmt.Sprintf("Websocket[%d].Dial: can't connect to %s, will try again in %v\n", ws.Id, ws.url, nextInterval))
}
if ws.OnConnectError != nil {
ws.OnConnectError(ws, err)
}
}
time.Sleep(nextInterval)
}
}
func (ws *Websocket) GetHTTPResponse() *http.Response {
ws.mu.Lock()
defer ws.mu.Unlock()
return ws.httpResponse
}
func (ws *Websocket) GetDialError() error {
ws.mu.Lock()
defer ws.mu.Unlock()
return ws.dialErr
}
func (ws *Websocket) IsConnected() bool {
ws.mu.Lock()
defer ws.mu.Unlock()
return ws.isConnected
}
func (ws *Websocket) setDefaults() {
if ws.ReconnectIntervalMin == 0 {
ws.ReconnectIntervalMin = 2 * time.Second
}
if ws.ReconnectIntervalMax == 0 {
ws.ReconnectIntervalMax = 30 * time.Second
}
if ws.ReconnectIntervalFactor == 0 {
ws.ReconnectIntervalFactor = 1.5
}
if ws.HandshakeTimeout == 0 {
ws.HandshakeTimeout = 2 * time.Second
}
}
func parseUrl(urlStr string) (*url.URL, error) {
if urlStr == "" {
return nil, ErrUrlEmpty
}
u, err := url.Parse(urlStr)
if err != nil {
return nil, err
}
if u.Scheme != "ws" && u.Scheme != "wss" {
return nil, ErrUrlWrongScheme
}
if u.User != nil {
return nil, ErrUrlNamePassNotAllowed
}
return u, nil
}