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local_transport.go
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local_transport.go
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package mercure
import (
"net/url"
"sync"
)
func init() { //nolint:gochecknoinits
RegisterTransportFactory("local", DeprecatedNewLocalTransport)
}
// LocalTransport implements the TransportInterface without database and simply broadcast the live Updates.
type LocalTransport struct {
sync.RWMutex
subscribers *SubscriberList
lastEventID string
closed chan struct{}
closedOnce sync.Once
}
// DeprecatedNewLocalTransport creates a new LocalTransport.
//
// Deprecated: use NewLocalTransport() instead.
func DeprecatedNewLocalTransport(_ *url.URL, _ Logger) (Transport, error) { //nolint:ireturn
return NewLocalTransport(), nil
}
// NewLocalTransport creates a new LocalTransport.
func NewLocalTransport() *LocalTransport {
return &LocalTransport{
subscribers: NewSubscriberList(1e5),
closed: make(chan struct{}),
lastEventID: EarliestLastEventID,
}
}
// Dispatch dispatches an update to all subscribers.
func (t *LocalTransport) Dispatch(update *Update) error {
select {
case <-t.closed:
return ErrClosedTransport
default:
}
AssignUUID(update)
for _, s := range t.subscribers.MatchAny(update) {
s.Dispatch(update, false)
}
t.Lock()
t.lastEventID = update.ID
t.Unlock()
return nil
}
// AddSubscriber adds a new subscriber to the transport.
func (t *LocalTransport) AddSubscriber(s *Subscriber) error {
select {
case <-t.closed:
return ErrClosedTransport
default:
}
t.Lock()
defer t.Unlock()
t.subscribers.Add(s)
if s.RequestLastEventID != "" {
s.HistoryDispatched(EarliestLastEventID)
}
s.Ready()
return nil
}
// RemoveSubscriber removes a subscriber from the transport.
func (t *LocalTransport) RemoveSubscriber(s *Subscriber) error {
select {
case <-t.closed:
return ErrClosedTransport
default:
}
t.Lock()
defer t.Unlock()
t.subscribers.Remove(s)
return nil
}
// GetSubscribers gets the list of active subscribers.
func (t *LocalTransport) GetSubscribers() (string, []*Subscriber, error) {
t.RLock()
defer t.RUnlock()
return t.lastEventID, getSubscribers(t.subscribers), nil
}
// Close closes the Transport.
func (t *LocalTransport) Close() (err error) {
t.closedOnce.Do(func() {
t.Lock()
defer t.Unlock()
close(t.closed)
t.subscribers.Walk(0, func(s *Subscriber) bool {
s.Disconnect()
return true
})
})
return nil
}
// Interface guard.
var _ Transport = (*LocalTransport)(nil)