add internal/{processor,streaming}

internal/streaming/event.go

@@ -0,0 +1,57 @@
+package streaming
+
+import "encoding/json"
+
+type EventType int8
+
+const (
+	EventTypeError EventType = 1
+	EventTypePost  EventType = 2
+
+	EventTypeSubscribe   EventType = 126
+	EventTypeUnsubscribe EventType = 127
+)
+
+func (et EventType) Valid() bool {
+	switch et {
+	case EventTypeError:
+		return true
+	case EventTypePost:
+		return true
+	case EventTypeSubscribe:
+		return true
+	case EventTypeUnsubscribe:
+		return true
+	default:
+		return false
+	}
+}
+
+// Returns true if this event can be subscribed to/unsubscribed from
+func (et EventType) ValidReceive() bool {
+	if !et.Valid() {
+		return false
+	}
+
+	switch et {
+	case EventTypeError, EventTypeSubscribe, EventTypeUnsubscribe:
+		return false
+	default:
+		return true
+	}
+}
+
+type Event struct {
+	Type EventType `json:"t"`
+	Data any       `json:"d"`
+}
+
+type ErrorEvent struct {
+	Code    int    `json:"code"`
+	Message string `json:"message"`
+}
+
+type IncomingEvent struct {
+	Type EventType       `json:"t"`
+	Data json.RawMessage `json:"d"` // this is a RawMessage so we can easily unmarshal it later
+}