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
|
//
// rhctl
//
// Copyright (C) 2009-2016 Christian Pointner <equinox@helsinki.at>
//
// This file is part of rhctl.
//
// rhctl is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// rhctl is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with rhctl. If not, see <http://www.gnu.org/licenses/>.
//
package main
import (
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"github.com/gorilla/websocket"
)
type webSocketRequestData struct {
Command string `json:"COMMAND"`
}
type webSocketResponseBaseData struct {
ResponseCode int `json:"RESPONSE_CODE"`
Type string `json:"TYPE"`
ErrorString string `json:"ERROR_STRING"`
}
type webSocketResponseStateData struct {
webSocketResponseBaseData
State State `json:"STATE"`
}
func sendWebSocketResponse(ws *websocket.Conn, rd interface{}) {
if err := ws.WriteJSON(rd); err != nil {
rhdl.Println("Web(socket) client", ws.RemoteAddr(), "write error:", err)
}
}
func sendWebSocketErrorResponse(ws *websocket.Conn, code int, errStr string) {
rd := &webSocketResponseBaseData{}
rd.ResponseCode = code
rd.Type = "error"
rd.ErrorString = errStr
sendWebSocketResponse(ws, rd)
}
func sendWebSocketStateResponse(ws *websocket.Conn, state State) {
rd := &webSocketResponseStateData{}
rd.ResponseCode = http.StatusOK
rd.Type = "state"
rd.ErrorString = "OK"
rd.State = state
sendWebSocketResponse(ws, rd)
}
func webSocketSessionHandler(reqchan <-chan webSocketRequestData, ws *websocket.Conn, ctrl *SwitchControl) {
defer ws.Close()
for {
select {
case reqdata, ok := <-reqchan:
if !ok {
return
}
switch reqdata.Command {
case "state":
resp := make(chan interface{})
ctrl.Commands <- &Command{Type: CmdState, Response: resp}
result := <-resp
switch result.(type) {
case State:
sendWebSocketStateResponse(ws, result.(State))
case error:
sendWebSocketErrorResponse(ws, http.StatusInternalServerError, result.(error).Error())
default:
sendWebSocketErrorResponse(ws, http.StatusInternalServerError, fmt.Sprintf("invalid response of type %T: %+v", result, result))
}
default:
sendWebSocketErrorResponse(ws, http.StatusBadRequest, fmt.Sprintf("unknown command '%s'", reqdata.Command))
}
}
}
}
func webSocketHandler(ctrl *SwitchControl, w http.ResponseWriter, r *http.Request) {
ws, err := websocket.Upgrade(w, r, nil, 64*1024, 64*1024)
if _, ok := err.(websocket.HandshakeError); ok {
http.Error(w, "Not a websocket handshake", 400)
return
} else if err != nil {
rhdl.Println("Web(socket) client", ws.RemoteAddr(), "error:", err)
return
}
rhdl.Println("Web(socket) client", ws.RemoteAddr(), "connected")
reqchan := make(chan webSocketRequestData)
go webSocketSessionHandler(reqchan, ws, ctrl)
defer close(reqchan)
for {
t, r, err := ws.NextReader()
if err != nil {
rhdl.Println("Web(socket) Client", ws.RemoteAddr(), "disconnected:", err)
return
}
switch t {
case websocket.TextMessage:
var reqdata webSocketRequestData
if err := json.NewDecoder(r).Decode(&reqdata); err != nil {
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
rhdl.Println("Web(socket) client", ws.RemoteAddr(), "request error:", err)
sendWebSocketErrorResponse(ws, http.StatusBadRequest, err.Error())
return
}
// rhdl.Printf("Web(socket) client %s got: %+v", ws.RemoteAddr(), reqdata)
reqchan <- reqdata
case websocket.BinaryMessage:
sendWebSocketErrorResponse(ws, http.StatusBadRequest, "binary messages are not allowed")
io.Copy(ioutil.Discard, r) // consume all the data
}
}
}
|
