feat: add go realtime redis api

go/vehicle-gateway/internal/realtime/model.go

@@ -0,0 +1,38 @@
+package realtime
+
+import (
+	"time"
+
+	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/envelope"
+)
+
+type Snapshot struct {
+	VIN            string            `json:"vin"`
+	Protocol       envelope.Protocol `json:"protocol,omitempty"`
+	EventID        string            `json:"event_id,omitempty"`
+	EventTimeMS    int64             `json:"event_time_ms"`
+	ReceivedAtMS   int64             `json:"received_at_ms"`
+	SourceEndpoint string            `json:"source_endpoint,omitempty"`
+	Fields         map[string]any    `json:"fields,omitempty"`
+	FieldTimesMS   map[string]int64  `json:"field_times_ms,omitempty"`
+	UpdatedAtMS    int64             `json:"updated_at_ms"`
+}
+
+type OnlineStatus struct {
+	VIN        string              `json:"vin"`
+	Online     bool                `json:"online"`
+	LastSeenMS int64               `json:"last_seen_ms"`
+	Protocols  []envelope.Protocol `json:"protocols,omitempty"`
+	TTLSeconds int64               `json:"ttl_seconds"`
+}
+
+type Config struct {
+	OnlineTTL time.Duration
+}
+
+func (c Config) ttl() time.Duration {
+	if c.OnlineTTL <= 0 {
+		return 10 * time.Minute
+	}
+	return c.OnlineTTL
+}