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// Copyright 2016 CoreOS, Inc.
//
// 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 runtime
import (
"fmt"
"io"
"net"
"net/http"
"sort"
"strings"
)
type httpHandler struct{}
func serve(host string) error {
ln, err := net.Listen("tcp", host)
if err != nil {
return err
}
go http.Serve(ln, &httpHandler{})
return nil
}
func (*httpHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// This prevents all failpoints from being triggered. It ensures
// the server(runtime) doesn't panic due to any failpoints during
// processing the HTTP request.
// It may be inefficient, but correctness is more important than
// efficiency. Usually users will not enable too many failpoints
// at a time, so it (the efficiency) isn't a problem.
failpointsMu.Lock()
defer failpointsMu.Unlock()
// flush before unlocking so a panic failpoint won't
// take down the http server before it sends the response
defer flush(w)
key := r.RequestURI
if len(key) == 0 || key[0] != '/' {
http.Error(w, "malformed request URI", http.StatusBadRequest)
return
}
key = key[1:]
switch {
// sets the failpoint
case r.Method == "PUT":
v, err := io.ReadAll(r.Body)
if err != nil {
http.Error(w, "failed ReadAll in PUT", http.StatusBadRequest)
return
}
fpMap := map[string]string{key: string(v)}
if strings.EqualFold(key, "failpoints") {
fpMap, err = parseFailpoints(string(v))
if err != nil {
http.Error(w, fmt.Sprintf("fail to parse failpoint: %v", err), http.StatusBadRequest)
return
}
}
for k, v := range fpMap {
if err := enable(k, v); err != nil {
http.Error(w, fmt.Sprintf("fail to set failpoint: %v", err), http.StatusBadRequest)
return
}
}
w.WriteHeader(http.StatusNoContent)
// gets status of the failpoint
case r.Method == "GET":
if len(key) == 0 {
fps := list()
sort.Strings(fps)
lines := make([]string, len(fps))
for i := range lines {
s, _ := status(fps[i])
lines[i] = fps[i] + "=" + s
}
w.Write([]byte(strings.Join(lines, "\n") + "\n"))
} else {
status, err := status(key)
if err != nil {
http.Error(w, "failed to GET: "+err.Error(), http.StatusNotFound)
}
w.Write([]byte(status + "\n"))
}
// deactivates a failpoint
case r.Method == "DELETE":
if err := disable(key); err != nil {
http.Error(w, "failed to delete failpoint "+err.Error(), http.StatusBadRequest)
return
}
w.WriteHeader(http.StatusNoContent)
default:
w.Header().Add("Allow", "DELETE")
w.Header().Add("Allow", "GET")
w.Header().Set("Allow", "PUT")
http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
}
}
func flush(w http.ResponseWriter) {
if f, ok := w.(http.Flusher); ok {
f.Flush()
}
}
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