forked from redpanda-data/connect
-
Notifications
You must be signed in to change notification settings - Fork 0
/
websocket.go
176 lines (146 loc) · 4.49 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
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
// Copyright (c) 2018 Ashley Jeffs
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package reader
import (
"net/http"
"net/url"
"sync"
"time"
"github.com/Jeffail/benthos/lib/log"
"github.com/Jeffail/benthos/lib/message"
"github.com/Jeffail/benthos/lib/metrics"
"github.com/Jeffail/benthos/lib/types"
"github.com/Jeffail/benthos/lib/util/http/auth"
"github.com/gorilla/websocket"
)
//------------------------------------------------------------------------------
// WebsocketConfig contains configuration fields for the Websocket input type.
type WebsocketConfig struct {
URL string `json:"url" yaml:"url"`
OpenMsg string `json:"open_message" yaml:"open_message"`
auth.Config `json:",inline" yaml:",inline"`
}
// NewWebsocketConfig creates a new WebsocketConfig with default values.
func NewWebsocketConfig() WebsocketConfig {
return WebsocketConfig{
URL: "ws://localhost:4195/get/ws",
OpenMsg: "",
Config: auth.NewConfig(),
}
}
//------------------------------------------------------------------------------
// Websocket is an input type that reads Websocket messages.
type Websocket struct {
log log.Modular
stats metrics.Type
lock *sync.Mutex
conf WebsocketConfig
client *websocket.Conn
}
// NewWebsocket creates a new Websocket input type.
func NewWebsocket(
conf WebsocketConfig,
log log.Modular,
stats metrics.Type,
) (*Websocket, error) {
ws := &Websocket{
log: log.NewModule(".input.websocket"),
stats: stats,
lock: &sync.Mutex{},
conf: conf,
}
return ws, nil
}
//------------------------------------------------------------------------------
func (w *Websocket) getWS() *websocket.Conn {
w.lock.Lock()
ws := w.client
w.lock.Unlock()
return ws
}
//------------------------------------------------------------------------------
// Connect establishes a connection to a Websocket server.
func (w *Websocket) Connect() error {
w.lock.Lock()
defer w.lock.Unlock()
if w.client != nil {
return nil
}
headers := http.Header{}
purl, err := url.Parse(w.conf.URL)
if err != nil {
return err
}
if err = w.conf.Sign(&http.Request{
URL: purl,
Header: headers,
}); err != nil {
return err
}
var client *websocket.Conn
if client, _, err = websocket.DefaultDialer.Dial(w.conf.URL, headers); err != nil {
return err
}
if len(w.conf.OpenMsg) > 0 {
if err = client.WriteMessage(
websocket.BinaryMessage, []byte(w.conf.OpenMsg),
); err != nil {
return err
}
}
w.client = client
return nil
}
//------------------------------------------------------------------------------
// Read attempts to read a new message from the websocket.
func (w *Websocket) Read() (types.Message, error) {
client := w.getWS()
if client == nil {
return nil, types.ErrNotConnected
}
_, data, err := client.ReadMessage()
if err != nil {
w.lock.Lock()
w.client = nil
w.lock.Unlock()
err = types.ErrNotConnected
return nil, err
}
return message.New([][]byte{data}), nil
}
// Acknowledge instructs whether the pending messages were propagated
// successfully.
func (w *Websocket) Acknowledge(err error) error {
return nil
}
// CloseAsync shuts down the Websocket input and stops reading messages.
func (w *Websocket) CloseAsync() {
w.lock.Lock()
if w.client != nil {
w.client.Close()
w.client = nil
}
w.lock.Unlock()
}
// WaitForClose blocks until the Websocket input has closed down.
func (w *Websocket) WaitForClose(timeout time.Duration) error {
return nil
}
//------------------------------------------------------------------------------