test: harden weed mini readiness checks

test/s3tables/testutil/weed_mini.go

@@ -2,11 +2,16 @@ package testutil
 
 import (
 	"fmt"
+	"math/rand"
 	"net"
 	"os"
 	"path/filepath"
+	"testing"
+	"time"
 )
 
+const SeaweedMiniStartupTimeout = 45 * time.Second
+
 func FindBindIP() string {
 	addrs, err := net.InterfaceAddrs()
 	if err != nil {
@@ -54,3 +59,35 @@ func WriteIAMConfig(dir, accessKey, secretKey string) (string, error) {
 	}
 	return iamConfigPath, nil
 }
+
+func MustFreeMiniPort(t *testing.T, name string) int {
+	t.Helper()
+
+	const (
+		minPort = 10000
+		maxPort = 55000
+	)
+	r := rand.New(rand.NewSource(time.Now().UnixNano()))
+
+	for i := 0; i < 1000; i++ {
+		port := minPort + r.Intn(maxPort-minPort)
+
+		listener, err := net.Listen("tcp", fmt.Sprintf("127.0.0.1:%d", port))
+		if err != nil {
+			continue
+		}
+		_ = listener.Close()
+
+		grpcPort := port + 10000
+		grpcListener, err := net.Listen("tcp", fmt.Sprintf("127.0.0.1:%d", grpcPort))
+		if err != nil {
+			continue
+		}
+		_ = grpcListener.Close()
+
+		return port
+	}
+
+	t.Fatalf("failed to get free weed mini port for %s", name)
+	return 0
+}