feat: distribute new local posts to followers via websocket

internal/streaming/sockets.go

@@ -13,6 +13,12 @@ type SocketHolder struct {
 	mu      sync.Mutex
 }
 
+func NewSocketHolder() *SocketHolder {
+	return &SocketHolder{
+		sockets: make(map[ulid.ULID]*userSockets),
+	}
+}
+
 func (sh *SocketHolder) Send(acctID ulid.ULID, et EventType, data any) {
 	userSockets := sh.SocketsFor(acctID)
 
@@ -22,7 +28,7 @@ func (sh *SocketHolder) Send(acctID ulid.ULID, et EventType, data any) {
 	userSockets.mu.Unlock()
 
 	for _, s := range sockets {
-		if s.willAcceptEvent(et) {
+		if s.WillAcceptEvent(et) {
 			// the socket might block for a bit, so spin this off into a separate goroutine
 			go func(s *Socket) {
 				s.ch <- Event{Type: et, Data: data}
@@ -71,7 +77,7 @@ type Socket struct {
 	mu sync.RWMutex
 }
 
-func (s *Socket) willAcceptEvent(mt EventType) bool {
+func (s *Socket) WillAcceptEvent(mt EventType) bool {
 	if mt == EventTypeError {
 		return true
 	}
@@ -109,6 +115,8 @@ func NewSocket(ctx context.Context, cancel context.CancelFunc) *Socket {
 		ctx:    ctx,
 		cancel: cancel,
 		ch:     make(chan Event),
-		types:  make(map[EventType]struct{}),
+		types: map[EventType]struct{}{
+			EventTypeEcho: {},
+		},
 	}
 }