mirror of
https://github.com/k3s-io/k3s.git
synced 2024-06-07 19:41:36 +00:00
127 lines
3.1 KiB
Go
127 lines
3.1 KiB
Go
|
/*
|
||
|
|
Copyright 2018 The Kubernetes 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 routes
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"html/template"
|
||
|
|
"io/ioutil"
|
||
|
|
"net/http"
|
||
|
|
"path"
|
||
|
|
"sync"
|
||
|
|
|
||
|
|
"k8s.io/klog"
|
||
|
|
|
||
|
|
"k8s.io/apiserver/pkg/server/mux"
|
||
|
|
)
|
||
|
|
|
||
|
|
var (
|
||
|
|
lock = &sync.RWMutex{}
|
||
|
|
registeredFlags = map[string]debugFlag{}
|
||
|
|
)
|
||
|
|
|
||
|
|
// DebugFlags adds handlers for flags under /debug/flags.
|
||
|
|
type DebugFlags struct {
|
||
|
|
}
|
||
|
|
|
||
|
|
// Install registers the APIServer's flags handler.
|
||
|
|
func (f DebugFlags) Install(c *mux.PathRecorderMux, flag string, handler func(http.ResponseWriter, *http.Request)) {
|
||
|
|
c.UnlistedHandle("/debug/flags", http.HandlerFunc(f.Index))
|
||
|
|
c.UnlistedHandlePrefix("/debug/flags/", http.HandlerFunc(f.Index))
|
||
|
|
|
||
|
|
url := path.Join("/debug/flags", flag)
|
||
|
|
c.UnlistedHandleFunc(url, handler)
|
||
|
|
|
||
|
|
f.addFlag(flag)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Index responds with the `/debug/flags` request.
|
||
|
|
// For example, "/debug/flags/v" serves the "--v" flag.
|
||
|
|
// Index responds to a request for "/debug/flags/" with an HTML page
|
||
|
|
// listing the available flags.
|
||
|
|
func (f DebugFlags) Index(w http.ResponseWriter, r *http.Request) {
|
||
|
|
lock.RLock()
|
||
|
|
defer lock.RUnlock()
|
||
|
|
if err := indexTmpl.Execute(w, registeredFlags); err != nil {
|
||
|
|
klog.Error(err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
var indexTmpl = template.Must(template.New("index").Parse(`<html>
|
||
|
|
<head>
|
||
|
|
<title>/debug/flags/</title>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
/debug/flags/<br>
|
||
|
|
<br>
|
||
|
|
flags:<br>
|
||
|
|
<table>
|
||
|
|
{{range .}}
|
||
|
|
<tr>{{.Flag}}<br>
|
||
|
|
{{end}}
|
||
|
|
</table>
|
||
|
|
<br>
|
||
|
|
full flags configurable<br>
|
||
|
|
</body>
|
||
|
|
</html>
|
||
|
|
`))
|
||
|
|
|
||
|
|
type debugFlag struct {
|
||
|
|
Flag string
|
||
|
|
}
|
||
|
|
|
||
|
|
func (f DebugFlags) addFlag(flag string) {
|
||
|
|
lock.Lock()
|
||
|
|
defer lock.Unlock()
|
||
|
|
registeredFlags[flag] = debugFlag{flag}
|
||
|
|
}
|
||
|
|
|
||
|
|
// StringFlagSetterFunc is a func used for setting string type flag.
|
||
|
|
type StringFlagSetterFunc func(string) (string, error)
|
||
|
|
|
||
|
|
// StringFlagPutHandler wraps an http Handler to set string type flag.
|
||
|
|
func StringFlagPutHandler(setter StringFlagSetterFunc) http.HandlerFunc {
|
||
|
|
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
|
||
|
|
switch {
|
||
|
|
case req.Method == "PUT":
|
||
|
|
body, err := ioutil.ReadAll(req.Body)
|
||
|
|
if err != nil {
|
||
|
|
writePlainText(http.StatusBadRequest, "error reading request body: "+err.Error(), w)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
defer req.Body.Close()
|
||
|
|
response, err := setter(string(body))
|
||
|
|
if err != nil {
|
||
|
|
writePlainText(http.StatusBadRequest, err.Error(), w)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
writePlainText(http.StatusOK, response, w)
|
||
|
|
return
|
||
|
|
default:
|
||
|
|
writePlainText(http.StatusNotAcceptable, "unsupported http method", w)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
// writePlainText renders a simple string response.
|
||
|
|
func writePlainText(statusCode int, text string, w http.ResponseWriter) {
|
||
|
|
w.Header().Set("Content-Type", "text/plain")
|
||
|
|
w.WriteHeader(statusCode)
|
||
|
|
fmt.Fprintln(w, text)
|
||
|
|
}
|