feat: build vehicle data platform and production pipeline

go/vehicle-gateway/internal/observability/logger.go

@@ -3,11 +3,28 @@ package observability
 import (
 	"log/slog"
 	"os"
+	"strings"
 )
 
 // NewLogger returns a JSON logger with a stable service field so ECS logs from
 // different Go processes can be filtered without relying on container names.
 func NewLogger(service string) *slog.Logger {
-	handler := slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{AddSource: true})
+	handler := slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
+		AddSource: true,
+		Level:     parseLogLevel(os.Getenv("LOG_LEVEL")),
+	})
 	return slog.New(handler).With("service", service)
 }
+
+func parseLogLevel(value string) slog.Level {
+	switch strings.ToLower(strings.TrimSpace(value)) {
+	case "debug":
+		return slog.LevelDebug
+	case "warn", "warning":
+		return slog.LevelWarn
+	case "error":
+		return slog.LevelError
+	default:
+		return slog.LevelInfo
+	}
+}

go/vehicle-gateway/internal/observability/logger_test.go

@@ -0,0 +1,27 @@
+package observability
+
+import (
+	"log/slog"
+	"testing"
+)
+
+func TestParseLogLevel(t *testing.T) {
+	tests := []struct {
+		name  string
+		value string
+		want  slog.Level
+	}{
+		{name: "empty defaults to info", value: "", want: slog.LevelInfo},
+		{name: "unknown defaults to info", value: "trace", want: slog.LevelInfo},
+		{name: "debug", value: "debug", want: slog.LevelDebug},
+		{name: "warn alias", value: "warning", want: slog.LevelWarn},
+		{name: "error trims and lowercases", value: " ERROR ", want: slog.LevelError},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := parseLogLevel(tt.value); got != tt.want {
+				t.Fatalf("parseLogLevel(%q) = %v, want %v", tt.value, got, tt.want)
+			}
+		})
+	}
+}