f-50: lab: topologie et calcul du plan #50

Signed-off-by: GnomeZworc <nicolas.boufidjeline@g3e.fr>

cmd/lab/main.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	"git.g3e.fr/syonad/two/internal/lab/topology"
+)
+
+const usage = `usage: lab <command> <topology.yml>
+
+  plan    validate the topology and print the deterministic plan: addresses, cables, ports
+`
+
+func main() {
+	os.Exit(run(os.Args[1:], os.Stdout, os.Stderr))
+}
+
+func run(args []string, stdout, stderr io.Writer) int {
+	if len(args) != 2 {
+		fmt.Fprint(stderr, usage)
+		return 2
+	}
+	switch args[0] {
+	case "plan":
+		return plan(args[1], stdout, stderr)
+	default:
+		fmt.Fprint(stderr, usage)
+		return 2
+	}
+}
+
+func plan(path string, stdout, stderr io.Writer) int {
+	t, err := topology.Load(path)
+	if err != nil {
+		fmt.Fprintf(stderr, "lab: %v\n", err)
+		return 1
+	}
+	p, err := topology.Compute(t)
+	if err != nil {
+		fmt.Fprintf(stderr, "lab: %s:\n%v\n", path, err)
+		return 1
+	}
+	if err := p.Write(stdout); err != nil {
+		fmt.Fprintf(stderr, "lab: %v\n", err)
+		return 1
+	}
+	return 0
+}