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iptables-locker.go
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/
iptables-locker.go
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// Copyright (c) 2017 Tigera, Inc. All rights reserved.
//
// 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 main
import (
"time"
"github.com/docopt/docopt-go"
log "github.com/sirupsen/logrus"
"github.com/projectcalico/felix/iptables"
)
const usage = `iptables-locker, test tool for grabbing the iptables lock.
Usage:
iptables-locker <duration>
`
func main() {
arguments, err := docopt.Parse(usage, nil, true, "v0.1", false)
if err != nil {
println(usage)
log.WithError(err).Fatal("Failed to parse usage")
}
durationStr := arguments["<duration>"].(string)
duration, err := time.ParseDuration(durationStr)
if err != nil {
println(usage)
log.WithError(err).Fatal("Failed to parse usage")
}
iptablesLock := iptables.NewSharedLock(
"/run/xtables.lock",
1*time.Second,
50*time.Millisecond,
)
iptablesLock.Lock()
println("LOCKED")
time.Sleep(duration)
iptablesLock.Unlock()
}