feat: build vehicle data platform and production pipeline

go/vehicle-gateway/internal/gateway/fields.go

@@ -0,0 +1,42 @@
+package gateway
+
+import (
+	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/envelope"
+	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/realtime"
+)
+
+const (
+	gatewayFieldsPublished          = "published"
+	gatewayFieldsDelegated          = "delegated_to_bridge"
+	gatewayFieldsSkippedNonRealtime = "skipped_non_realtime"
+	gatewayFieldsSkippedMissing     = "skipped_missing_fields"
+	gatewayFieldsPublishError       = "publish_error"
+)
+
+func gatewayFieldsEnvelope(env envelope.FrameEnvelope) (envelope.FrameEnvelope, string, bool) {
+	if !envelope.IsRealtimeTelemetryFrame(env) {
+		return envelope.FrameEnvelope{}, gatewayFieldsSkippedNonRealtime, false
+	}
+	fieldsEnv, ok := realtime.BuildFieldsEnvelope(env)
+	if !ok {
+		return envelope.FrameEnvelope{}, gatewayFieldsSkippedMissing, false
+	}
+	return fieldsEnv, gatewayFieldsPublished, true
+}
+
+func gatewayDelegatedFields(env envelope.FrameEnvelope) (int, string, bool) {
+	if !envelope.IsRealtimeTelemetryFrame(env) {
+		return 0, gatewayFieldsSkippedNonRealtime, false
+	}
+	if len(env.ParsedFields) == 0 {
+		return 0, gatewayFieldsSkippedMissing, false
+	}
+	return len(env.ParsedFields), gatewayFieldsDelegated, true
+}
+
+func canonicalRawEnvelope(env envelope.FrameEnvelope) envelope.FrameEnvelope {
+	env.EventKind = envelope.EventKindRaw
+	env.Parsed = nil
+	env.Fields = nil
+	return env
+}