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102 lines
2.4 KiB
Go
102 lines
2.4 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"fmt"
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"io/ioutil"
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"net/http"
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"os"
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"strings"
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"github.com/spf13/pflag"
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"k8s.io/apiserver/pkg/util/flag"
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"k8s.io/apiserver/pkg/util/logs"
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)
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// This Pod's /checknosnat takes `target` and `ips` arguments, and queries {target}/checknosnat?ips={ips}
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type MasqTestProxy struct {
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Port string
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}
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func NewMasqTestProxy() *MasqTestProxy {
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return &MasqTestProxy{
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Port: "31235",
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}
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}
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func (m *MasqTestProxy) AddFlags(fs *pflag.FlagSet) {
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fs.StringVar(&m.Port, "port", m.Port, "The port to serve /checknosnat endpoint on.")
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}
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func main() {
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m := NewMasqTestProxy()
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m.AddFlags(pflag.CommandLine)
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flag.InitFlags()
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logs.InitLogs()
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defer logs.FlushLogs()
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if err := m.Run(); err != nil {
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fmt.Fprintf(os.Stderr, "%v\n", err)
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os.Exit(1)
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}
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}
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func (m *MasqTestProxy) Run() error {
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// register handler
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http.HandleFunc("/checknosnat", checknosnat)
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// spin up the server
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return http.ListenAndServe(":"+m.Port, nil)
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}
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type handler func(http.ResponseWriter, *http.Request)
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func joinErrors(errs []error, sep string) string {
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strs := make([]string, len(errs))
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for i, err := range errs {
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strs[i] = err.Error()
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}
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return strings.Join(strs, sep)
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}
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func checknosnatURL(pip, ips string) string {
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return fmt.Sprintf("http://%s/checknosnat?ips=%s", pip, ips)
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}
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func checknosnat(w http.ResponseWriter, req *http.Request) {
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url := checknosnatURL(req.URL.Query().Get("target"), req.URL.Query().Get("ips"))
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resp, err := http.Get(url)
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if err != nil {
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w.WriteHeader(500)
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fmt.Fprintf(w, "error querying %q, err: %v", url, err)
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} else {
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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w.WriteHeader(500)
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fmt.Fprintf(w, "error reading body of response from %q, err: %v", url, err)
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} else {
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// Respond the same status code and body as /checknosnat on the internal Pod
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w.WriteHeader(resp.StatusCode)
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w.Write(body)
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}
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}
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resp.Body.Close()
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}
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