From 85b61c0f4d90ed164080d21d826f8950cd7cbb73 Mon Sep 17 00:00:00 2001
From: Gyuho Lee <leegyuho@amazon.com>
Date: Wed, 25 Nov 2020 10:38:42 -0800
Subject: [PATCH] pkg/netutil: remove unused "iptables" wrapper

Signed-off-by: Gyuho Lee <leegyuho@amazon.com>
---
 pkg/netutil/isolate_linux.go | 82 ------------------------------------
 pkg/netutil/isolate_stub.go  | 25 -----------
 2 files changed, 107 deletions(-)
 delete mode 100644 pkg/netutil/isolate_linux.go
 delete mode 100644 pkg/netutil/isolate_stub.go

diff --git a/pkg/netutil/isolate_linux.go b/pkg/netutil/isolate_linux.go
deleted file mode 100644
index 418580ac4..000000000
--- a/pkg/netutil/isolate_linux.go
+++ /dev/null
@@ -1,82 +0,0 @@
-// Copyright 2015 The etcd 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 netutil
-
-import (
-	"fmt"
-	"os/exec"
-)
-
-// DropPort drops all tcp packets that are received from the given port and sent to the given port.
-func DropPort(port int) error {
-	cmdStr := fmt.Sprintf("sudo iptables -A OUTPUT -p tcp --destination-port %d -j DROP", port)
-	if _, err := exec.Command("/bin/sh", "-c", cmdStr).Output(); err != nil {
-		return err
-	}
-	cmdStr = fmt.Sprintf("sudo iptables -A INPUT -p tcp --destination-port %d -j DROP", port)
-	_, err := exec.Command("/bin/sh", "-c", cmdStr).Output()
-	return err
-}
-
-// RecoverPort stops dropping tcp packets at given port.
-func RecoverPort(port int) error {
-	cmdStr := fmt.Sprintf("sudo iptables -D OUTPUT -p tcp --destination-port %d -j DROP", port)
-	if _, err := exec.Command("/bin/sh", "-c", cmdStr).Output(); err != nil {
-		return err
-	}
-	cmdStr = fmt.Sprintf("sudo iptables -D INPUT -p tcp --destination-port %d -j DROP", port)
-	_, err := exec.Command("/bin/sh", "-c", cmdStr).Output()
-	return err
-}
-
-// SetLatency adds latency in millisecond scale with random variations.
-func SetLatency(ms, rv int) error {
-	ifces, err := GetDefaultInterfaces()
-	if err != nil {
-		return err
-	}
-
-	if rv > ms {
-		rv = 1
-	}
-	for ifce := range ifces {
-		cmdStr := fmt.Sprintf("sudo tc qdisc add dev %s root netem delay %dms %dms distribution normal", ifce, ms, rv)
-		_, err = exec.Command("/bin/sh", "-c", cmdStr).Output()
-		if err != nil {
-			// the rule has already been added. Overwrite it.
-			cmdStr = fmt.Sprintf("sudo tc qdisc change dev %s root netem delay %dms %dms distribution normal", ifce, ms, rv)
-			_, err = exec.Command("/bin/sh", "-c", cmdStr).Output()
-			if err != nil {
-				return err
-			}
-		}
-	}
-	return nil
-}
-
-// RemoveLatency resets latency configurations.
-func RemoveLatency() error {
-	ifces, err := GetDefaultInterfaces()
-	if err != nil {
-		return err
-	}
-	for ifce := range ifces {
-		_, err = exec.Command("/bin/sh", "-c", fmt.Sprintf("sudo tc qdisc del dev %s root netem", ifce)).Output()
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}
diff --git a/pkg/netutil/isolate_stub.go b/pkg/netutil/isolate_stub.go
deleted file mode 100644
index 7f4c3e67c..000000000
--- a/pkg/netutil/isolate_stub.go
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright 2015 The etcd 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.
-
-// +build !linux
-
-package netutil
-
-func DropPort(port int) error { return nil }
-
-func RecoverPort(port int) error { return nil }
-
-func SetLatency(ms, rv int) error { return nil }
-
-func RemoveLatency() error { return nil }