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|
package events
import (
"context"
"encoding/json"
"fmt"
"slices"
"time"
"github.com/google/uuid"
"github.com/lxc/incus/v6/shared/api"
"github.com/lxc/incus/v6/shared/cancel"
)
// DevIncusServer represents an instance of an devIncus event server.
type DevIncusServer struct {
serverCommon
listeners map[string]*DevIncusListener
}
// NewDevIncusServer returns a new devIncus event server.
func NewDevIncusServer(debug bool, verbose bool) *DevIncusServer {
server := &DevIncusServer{
serverCommon: serverCommon{
debug: debug,
verbose: verbose,
},
listeners: map[string]*DevIncusListener{},
}
return server
}
// AddListener creates and returns a new event listener.
func (s *DevIncusServer) AddListener(instanceID int, connection EventListenerConnection, messageTypes []string) (*DevIncusListener, error) {
listener := &DevIncusListener{
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 *DevIncusServer) 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 *DevIncusServer) broadcast(instanceID int, event api.Event) error {
s.lock.Lock()
listeners := s.listeners
for _, listener := range listeners {
if !slices.Contains(listener.messageTypes, event.Type) {
continue
}
if listener.instanceID != instanceID {
continue
}
go func(listener *DevIncusListener, 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
}
// DevIncusListener describes a devIncus event listener.
type DevIncusListener struct {
listenerCommon
instanceID int
}
|
