debug.go

/*
Copyright 2015 The Kubernetes Authors 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 podtask

import (
	"fmt"
	"io"
	"net/http"

	log "github.com/golang/glog"
)

//TODO(jdef) we use a Locker to guard against concurrent task state changes, but it would be
//really, really nice to avoid doing this. Maybe someday the registry won't return data ptrs
//but plain structs instead.
func InstallDebugHandlers(reg Registry, mux *http.ServeMux) {
	mux.HandleFunc("/debug/registry/tasks", func(w http.ResponseWriter, r *http.Request) {
		//TODO(jdef) support filtering tasks based on status
		alltasks := reg.List(nil)
		io.WriteString(w, fmt.Sprintf("task_count=%d\n", len(alltasks)))
		for _, task := range alltasks {
			if err := func() (err error) {
				podName := task.Pod.Name
				podNamespace := task.Pod.Namespace
				offerId := ""
				if task.Offer != nil {
					offerId = task.Offer.Id()
				}
				_, err = io.WriteString(w, fmt.Sprintf("%v\t%v/%v\t%v\t%v\n", task.ID, podNamespace, podName, task.State, offerId))
				return
			}(); err != nil {
				log.Warningf("aborting debug handler: %v", err)
				break // stop listing on I/O errors
			}
		}
		if flusher, ok := w.(http.Flusher); ok {
			flusher.Flush()
		}
	})
}