feat: enhance EvoBGP with new command-line options for the evobgp-agent, including a watch command for periodic configuration updates. Update go.mod with additional dependencies and improve Docker Compose setup for new services, including NATS and various worker components.

cmd/evobgp-agent/main.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"flag"
 	"fmt"
+	"log"
 	"os"
 	"time"
 
@@ -15,11 +16,13 @@ func main() {
 	birdc := flag.String("birdc", "", "path to birdc binary (default: birdc from PATH)")
 	socket := flag.String("socket", "", "optional birdc control socket (-s)")
 	timeout := flag.Duration("timeout", 30*time.Second, "timeout for bird/birdc")
+	watchEvery := flag.Duration("watch-interval", 30*time.Second, "for watch: interval between birdc configure")
 	flag.Usage = func() {
 		fmt.Fprintf(os.Stderr, "Usage: %s [flags] <command>\n", os.Args[0])
 		fmt.Fprintf(os.Stderr, "Commands:\n")
 		fmt.Fprintf(os.Stderr, "  parse-check <path/to/bird.conf>   run bird -c <path> -p (syntax check)\n")
 		fmt.Fprintf(os.Stderr, "  configure                         run birdc configure (reload running BIRD)\n")
+		fmt.Fprintf(os.Stderr, "  watch                             periodically run birdc configure (compose sidecar)\n")
 		flag.PrintDefaults()
 	}
 	flag.Parse()
@@ -59,6 +62,21 @@ func main() {
 			fmt.Fprintln(os.Stderr, err)
 			os.Exit(1)
 		}
+	case "watch":
+		if *watchEvery <= 0 {
+			fmt.Fprintln(os.Stderr, "watch-interval must be > 0")
+			os.Exit(2)
+		}
+		log.Printf("evobgp-agent watch: birdc configure every %s (socket=%q)", *watchEvery, *socket)
+		for {
+			cctx, cancel := context.WithTimeout(context.Background(), *timeout)
+			err := ctl.Configure(cctx)
+			cancel()
+			if err != nil {
+				log.Printf("evobgp-agent watch: configure: %v", err)
+			}
+			time.Sleep(*watchEvery)
+		}
 	default:
 		fmt.Fprintf(os.Stderr, "unknown command: %s\n", args[0])
 		flag.Usage()