1 files changed, 38 insertions, 0 deletions
diff --git a/test/benchmarks/harness/util.go b/test/benchmarks/harness/util.go
new file mode 100644
index 000000000..cc7de6426
--- /dev/null
+++ b/test/benchmarks/harness/util.go
@@ -0,0 +1,38 @@
+// Copyright 2020 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package harness
+
+import (
+	"context"
+	"fmt"
+	"net"
+
+	"gvisor.dev/gvisor/pkg/test/dockerutil"
+	"gvisor.dev/gvisor/pkg/test/testutil"
+)
+
+// WaitUntilServing grabs a container from `machine` and waits for a server at
+// IP:port.
+func WaitUntilServing(ctx context.Context, machine Machine, server net.IP, port int) error {
+	var logger testutil.DefaultLogger = "netcat"
+	netcat := machine.GetContainer(ctx, logger)
+	defer netcat.CleanUp(ctx)
+
+	cmd := fmt.Sprintf("while ! nc -zv %s %d; do true; done", server.String(), port)
+	_, err := netcat.Run(ctx, dockerutil.RunOpts{
+		Image: "packetdrill",
+	}, "sh", "-c", cmd)
+	return err
+}