-
Notifications
You must be signed in to change notification settings - Fork 907
/
devlxdEvents.go
123 lines (97 loc) · 2.56 KB
/
devlxdEvents.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
package events
import (
"context"
"encoding/json"
"fmt"
"time"
"github.com/google/uuid"
"github.com/canonical/lxd/shared"
"github.com/canonical/lxd/shared/api"
"github.com/canonical/lxd/shared/cancel"
)
// DevLXDServer represents an instance of an devlxd event server.
type DevLXDServer struct {
serverCommon
listeners map[string]*DevLXDListener
}
// NewDevLXDServer returns a new devlxd event server.
func NewDevLXDServer(debug bool, verbose bool) *DevLXDServer {
server := &DevLXDServer{
serverCommon: serverCommon{
debug: debug,
verbose: verbose,
},
listeners: map[string]*DevLXDListener{},
}
return server
}
// AddListener creates and returns a new event listener.
func (s *DevLXDServer) AddListener(instanceID int, connection EventListenerConnection, messageTypes []string) (*DevLXDListener, error) {
listener := &DevLXDListener{
listenerCommon: listenerCommon{
EventListenerConnection: connection,
messageTypes: messageTypes,
done: cancel.New(context.Background()),
id: uuid.New().String(),
},
instanceID: instanceID,
}
s.lock.Lock()
defer s.lock.Unlock()
if s.listeners[listener.id] != nil {
return nil, fmt.Errorf("A listener with ID %q already exists", listener.id)
}
s.listeners[listener.id] = listener
go listener.start()
return listener, nil
}
// Send broadcasts a custom event.
func (s *DevLXDServer) Send(instanceID int, eventType string, eventMessage any) error {
encodedMessage, err := json.Marshal(eventMessage)
if err != nil {
return err
}
event := api.Event{
Type: eventType,
Timestamp: time.Now(),
Metadata: encodedMessage,
}
return s.broadcast(instanceID, event)
}
func (s *DevLXDServer) broadcast(instanceID int, event api.Event) error {
s.lock.Lock()
listeners := s.listeners
for _, listener := range listeners {
if !shared.ValueInSlice(event.Type, listener.messageTypes) {
continue
}
if listener.instanceID != instanceID {
continue
}
go func(listener *DevLXDListener, event api.Event) {
// Check that the listener still exists
if listener == nil {
return
}
// Make sure we're not done already
if listener.IsClosed() {
return
}
err := listener.WriteJSON(event)
if err != nil {
// Remove the listener from the list
s.lock.Lock()
delete(s.listeners, listener.id)
s.lock.Unlock()
listener.Close()
}
}(listener, event)
}
s.lock.Unlock()
return nil
}
// DevLXDListener describes a devlxd event listener.
type DevLXDListener struct {
listenerCommon
instanceID int
}