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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", NewLocalTransport)
}
// LocalTransport implements the TransportInterface without database and simply broadcast the live Updates.
type LocalTransport struct {
sync.RWMutex
subscribers map[*Subscriber]struct{}
lastEventID string
closed chan struct{}
closedOnce sync.Once
}
// NewLocalTransport create a new LocalTransport.
func NewLocalTransport(u *url.URL, l Logger, tss *TopicSelectorStore) (Transport, error) {
return &LocalTransport{
subscribers: make(map[*Subscriber]struct{}),
closed: make(chan struct{}),
lastEventID: EarliestLastEventID,
}, nil
}
// Dispatch dispatches an update to all subscribers.
func (t *LocalTransport) Dispatch(update *Update) error {
select {
case <-t.closed:
return ErrClosedTransport
default:
}
AssignUUID(update)
t.Lock()
defer t.Unlock()
for subscriber := range t.subscribers {
if !subscriber.Dispatch(update, false) {
delete(t.subscribers, subscriber)
}
}
t.lastEventID = update.ID
return nil
}
// AddSubscriber adds a new subscriber to the transport.
func (t *LocalTransport) AddSubscriber(s *Subscriber) error {
t.Lock()
defer t.Unlock()
select {
case <-t.closed:
return ErrClosedTransport
default:
}
t.subscribers[s] = struct{}{}
if s.RequestLastEventID != "" {
s.HistoryDispatched(EarliestLastEventID)
}
return nil
}
// GetSubscribers get the list of active subscribers.
func (t *LocalTransport) GetSubscribers() (string, []*Subscriber, error) {
t.RLock()
defer t.RUnlock()
subscribers := make([]*Subscriber, len(t.subscribers))
i := 0
for subscriber := range t.subscribers {
subscribers[i] = subscriber
i++
}
return t.lastEventID, subscribers, nil
}
// Close closes the Transport.
func (t *LocalTransport) Close() (err error) {
t.closedOnce.Do(func() {
t.Lock()
defer t.Unlock()
close(t.closed)
for subscriber := range t.subscribers {
subscriber.Disconnect()
delete(t.subscribers, subscriber)
}
})
return nil
}
// Interface guard.
var _ Transport = (*BoltTransport)(nil)