-
Notifications
You must be signed in to change notification settings - Fork 1
/
eventmessage.go
66 lines (55 loc) · 1.53 KB
/
eventmessage.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
// Copyright 2014 Matthias Kalb, Railsmechanic. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package eventsource
import (
"bytes"
"encoding/json"
"fmt"
"io"
"strings"
)
// EventMessage stores information of a message.
type eventMessage struct {
Id uint `json:"id"`
Event string `json:"event"`
Data string `json:"data"`
Channel string `json:"-"`
}
// NewEventMessage builds and returns a new eventMessage based on the given JSON data stream.
func newEventMessage(messageStream io.Reader, channel string) (*eventMessage, error) {
var em eventMessage
dec := json.NewDecoder(messageStream)
for {
if err := dec.Decode(&em); err == io.EOF {
break
} else if err != nil {
return nil, err
}
}
if channel == "" {
em.Channel = "default"
} else {
em.Channel = channel
}
return &em, nil
}
// Message formats a []byte message which is finally sent to the consumers of a channel.
// Empty fields or fields that does not match the standard are removed.
func (em *eventMessage) Message() []byte {
var messageData bytes.Buffer
if em.Id > 0 {
messageData.WriteString(fmt.Sprintf("id: %d\n", em.Id))
}
if len(em.Event) > 0 {
messageData.WriteString(fmt.Sprintf("event: %s\n", strings.Replace(em.Event, "\n", "", -1)))
}
if len(em.Data) > 0 {
lines := strings.Split(em.Data, "\n")
for _, line := range lines {
messageData.WriteString(fmt.Sprintf("data: %s\n", line))
}
}
messageData.WriteString("\n")
return messageData.Bytes()
}