/
receiver.go
109 lines (96 loc) · 2.32 KB
/
receiver.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
package kuiperbelt
import (
"context"
"io"
"io/ioutil"
"net/http"
"net/url"
"sync"
"github.com/gorilla/websocket"
"github.com/pkg/errors"
)
type receivedMessage struct {
Message io.Reader
ContentType string
Header http.Header
}
func newReceivedMessage(msgType int, h http.Header, r io.Reader) receivedMessage {
var contentType string
switch msgType {
case websocket.TextMessage:
contentType = "text/plain"
case websocket.BinaryMessage:
contentType = "application/octet-stream"
}
return receivedMessage{
Message: r,
ContentType: contentType,
Header: h,
}
}
// Receiver is proxy message from a client
type Receiver interface {
Receive(context.Context, receivedMessage) error
}
// NewReceiverCallback is generate Receiver that proxy message to callback.Receive
func newCallbackReceiver(client *http.Client, callback *url.URL, c Config) Receiver {
return &callbackReceiver{
client: client,
callback: callback,
config: c,
}
}
type callbackReceiver struct {
client *http.Client
callback *url.URL
config Config
}
func (r *callbackReceiver) Receive(ctx context.Context, m receivedMessage) error {
req, err := http.NewRequest(
http.MethodPost,
r.callback.String(),
m.Message,
)
if err != nil {
return errors.Wrap(err, "cannot create receive callback request")
}
req = req.WithContext(ctx)
req.Header.Set("Content-Type", m.ContentType)
req.Header.Set(ENDPOINT_HEADER_NAME, r.config.Endpoint)
for k, v := range m.Header {
for _, vv := range v {
req.Header.Add(k, vv)
}
}
resp, err := r.client.Do(req)
if err != nil {
return errors.Wrap(err, "failed post receive callback request")
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
err := errCallbackResponseNotOK(resp.StatusCode)
return errors.Wrap(err, "unsuccessful post receive callback request")
}
return nil
}
type discardReceiver struct {
pool sync.Pool
}
func newDiscardReceiver() Receiver {
return &discardReceiver{
pool: sync.Pool{
New: func() interface{} {
return make([]byte, ioBufferSize)
},
},
}
}
func (r *discardReceiver) Receive(ctx context.Context, m receivedMessage) error {
buf := r.pool.Get().([]byte)
_, err := io.CopyBuffer(ioutil.Discard, m.Message, buf)
if err != nil {
return errors.Wrap(err, "cannot read message on discard")
}
r.pool.Put(buf)
return err
}