124 lines
3.3 KiB
Go
124 lines
3.3 KiB
Go
// +build linux
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/*
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Copyright 2016 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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// Reads the pod configuration from file or a directory of files.
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package config
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import (
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"fmt"
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"os"
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"github.com/golang/glog"
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"golang.org/x/exp/inotify"
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"k8s.io/kubernetes/pkg/api/v1"
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kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
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)
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type podEventType int
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const (
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podAdd podEventType = iota
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podModify
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podDelete
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)
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func (s *sourceFile) watch() error {
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_, err := os.Stat(s.path)
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if err != nil {
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if !os.IsNotExist(err) {
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return err
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}
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// Emit an update with an empty PodList to allow FileSource to be marked as seen
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s.updates <- kubetypes.PodUpdate{Pods: []*v1.Pod{}, Op: kubetypes.SET, Source: kubetypes.FileSource}
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return fmt.Errorf("path does not exist, ignoring")
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}
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w, err := inotify.NewWatcher()
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if err != nil {
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return fmt.Errorf("unable to create inotify: %v", err)
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}
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defer w.Close()
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err = w.AddWatch(s.path, inotify.IN_DELETE_SELF|inotify.IN_CREATE|inotify.IN_MOVED_TO|inotify.IN_MODIFY|inotify.IN_MOVED_FROM|inotify.IN_DELETE)
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if err != nil {
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return fmt.Errorf("unable to create inotify for path %q: %v", s.path, err)
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}
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// Reset store with config files already existing when starting
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if err := s.resetStoreFromPath(); err != nil {
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return fmt.Errorf("unable to read config path %q: %v", s.path, err)
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}
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for {
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select {
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case event := <-w.Event:
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err = s.processEvent(event)
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if err != nil {
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return fmt.Errorf("error while processing event (%+v): %v", event, err)
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}
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case err = <-w.Error:
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return fmt.Errorf("error while watching %q: %v", s.path, err)
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}
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}
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}
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func (s *sourceFile) processEvent(e *inotify.Event) error {
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var eventType podEventType
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switch {
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case (e.Mask & inotify.IN_ISDIR) > 0:
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glog.V(1).Infof("Not recursing into config path %q", s.path)
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return nil
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case (e.Mask & inotify.IN_CREATE) > 0:
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eventType = podAdd
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case (e.Mask & inotify.IN_MOVED_TO) > 0:
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eventType = podAdd
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case (e.Mask & inotify.IN_MODIFY) > 0:
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eventType = podModify
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case (e.Mask & inotify.IN_DELETE) > 0:
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eventType = podDelete
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case (e.Mask & inotify.IN_MOVED_FROM) > 0:
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eventType = podDelete
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case (e.Mask & inotify.IN_DELETE_SELF) > 0:
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return fmt.Errorf("the watched path is deleted")
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default:
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// Ignore rest events
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return nil
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}
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switch eventType {
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case podAdd, podModify:
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if pod, err := s.extractFromFile(e.Name); err != nil {
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glog.Errorf("can't process config file %q: %v", e.Name, err)
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} else {
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return s.store.Add(pod)
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}
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case podDelete:
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if objKey, keyExist := s.fileKeyMapping[e.Name]; keyExist {
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pod, podExist, err := s.store.GetByKey(objKey)
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if err != nil {
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return err
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} else if !podExist {
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return fmt.Errorf("the pod with key %s doesn't exist in cache", objKey)
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} else {
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return s.store.Delete(pod)
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}
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}
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}
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return nil
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}
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