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feat: add notification mechanism for network lifecycle events #566
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| package notification | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "net" | ||
|
|
||
| "github.com/containers/gvisor-tap-vsock/pkg/types" | ||
| log "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| type NotificationSender struct { | ||
| notificationCh chan types.NotificationMessage | ||
| socket string | ||
| } | ||
|
|
||
| func NewNotificationSender(socket string) *NotificationSender { | ||
| if socket == "" { | ||
| return &NotificationSender{ | ||
| socket: "", | ||
| notificationCh: nil, | ||
| } | ||
| } | ||
|
|
||
| return &NotificationSender{ | ||
| socket: socket, | ||
| notificationCh: make(chan types.NotificationMessage, 100), | ||
| } | ||
| } | ||
|
|
||
| func (s *NotificationSender) Send(notification types.NotificationMessage) { | ||
| if s.notificationCh == nil { | ||
| return | ||
| } | ||
| select { | ||
| case s.notificationCh <- notification: | ||
| default: | ||
| log.Warn("unable to send notification") | ||
| } | ||
| } | ||
|
|
||
| func (s *NotificationSender) Start(ctx context.Context) { | ||
| if s.notificationCh == nil { | ||
| return | ||
| } | ||
|
|
||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return | ||
| case notification := <-s.notificationCh: | ||
| if err := s.sendToSocket(notification); err != nil { | ||
| log.Errorf("failed to send notification: %v", err) | ||
| continue | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (s *NotificationSender) sendToSocket(notification types.NotificationMessage) error { | ||
| if s.socket == "" { | ||
| return nil | ||
| } | ||
| conn, err := net.DialUnix("unix", nil, &net.UnixAddr{Name: s.socket, Net: "unix"}) | ||
| if err != nil { | ||
| return fmt.Errorf("cannot dial notification socket: %w", err) | ||
| } | ||
| defer conn.Close() | ||
| enc := json.NewEncoder(conn) | ||
| if err := enc.Encode(notification); err != nil { | ||
| return fmt.Errorf("failed to encode notification: %w", err) | ||
| } | ||
| return nil | ||
| } |
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Initializing
notificationSenderhere becauseNewNotificationSenderalways returns a valid object (a no-op sender when socket is empty), removing the need for nil checks at everySend()call.