This repository has been archived by the owner on Apr 7, 2024. It is now read-only.
/
websocket.go
142 lines (128 loc) · 2.79 KB
/
websocket.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
package main
/*
* websocket.go
* Handles websocket comms
* By J. Stuart McMurray
* Created 20160108
* Last Modified 20160108
*/
import (
"bytes"
"encoding/json"
"fmt"
"log"
"time"
"golang.org/x/net/websocket"
)
/* Log unmarshal buffer */
var logMsgBuf = struct {
Messages struct {
Log []string
}
}{}
/* handleWebsocket connects to the service, auths with username u and
password p, and logs logs. It only returns on error */
func handleWebsocket(u, p string) error {
/* Dial the websocket server */
ws, err := websocket.Dial(wsURL, "", "http://kd5pbo/screepslog")
if nil != err {
return err
}
/* Authenticate */
if err := ws.SetWriteDeadline(time.Now().Add(wto)); nil != err {
return err
}
if _, err := ws.Write([]byte("auth " + token)); nil != err {
return err
}
/* Loop over read messages */
b := make([]byte, 10240)
for {
/* Set read deadline */
if err := ws.SetReadDeadline(time.Now().Add(
*rto,
)); nil != err {
return err
}
/* Read a message */
b = b[:cap(b)]
n, err := ws.Read(b)
b = b[:n]
if nil != err {
return err
}
/* Print it */
if err := handleMessage(b, ws); nil != err {
return err
}
}
}
/* handleMessage handles a message m from ws */
func handleMessage(m []byte, ws *websocket.Conn) error {
switch {
case bytes.HasPrefix(m, []byte("time")):
/* Ping */
return nil
case bytes.HasPrefix(m, []byte("auth ok")):
return handleAuthOk(ws)
default:
if err := handleLogMessage(m); nil != err {
return err
}
}
return nil
}
/* handleAuthOk requests a subscription to console log messages after an "auth
ok" has been received */
func handleAuthOk(ws *websocket.Conn) error {
/* Set write timeout */
if err := ws.SetWriteDeadline(time.Now().Add(wto)); nil != err {
return err
}
/* Ask to subscribe */
if _, err := ws.Write([]byte(
"subscribe user:" + uid + "/console",
)); nil != err {
return err
}
return nil
}
/* handleLogMessage handles a message which (hopefully) contains logs */
func handleLogMessage(m []byte) error {
/* Make a decoder */
dec := json.NewDecoder(bytes.NewBuffer(m))
/* Read to the open [ */
t, err := dec.Token()
if nil != err {
return err
}
if d, ok := t.(json.Delim); ok {
if "[" != d.String() {
return fmt.Errorf(
"bad delimiter %q in message %q",
d,
m,
)
}
} else {
return fmt.Errorf("unexpected delimiter (%T): %v", t, t)
}
/* Read the first bit, which is the uid */
var s string
if err := dec.Decode(&s); nil != err {
return err
}
/* If there's no more, something's wrong */
if !dec.More() {
return fmt.Errorf("unexpected end of message")
}
/* Try to unmarshal the rest */
if err := dec.Decode(&logMsgBuf); nil != err {
return err
}
/* Print out the log messages */
for _, v := range logMsgBuf.Messages.Log {
log.Printf("%v", v)
}
return nil
}