b22b627300
Organizes the cri related server packages under pkg/cri Signed-off-by: Derek McGowan <derek@mcg.dev>
122 lines
3.4 KiB
Go
122 lines
3.4 KiB
Go
/*
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Copyright The containerd 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 server
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import (
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"os"
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"sync"
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cni "github.com/containerd/go-cni"
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"github.com/fsnotify/fsnotify"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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)
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// cniNetConfSyncer is used to reload cni network conf triggered by fs change
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// events.
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type cniNetConfSyncer struct {
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// only used for lastSyncStatus
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sync.RWMutex
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lastSyncStatus error
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watcher *fsnotify.Watcher
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confDir string
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netPlugin cni.CNI
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loadOpts []cni.CNIOpt
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}
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// newCNINetConfSyncer creates cni network conf syncer.
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func newCNINetConfSyncer(confDir string, netPlugin cni.CNI, loadOpts []cni.CNIOpt) (*cniNetConfSyncer, error) {
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watcher, err := fsnotify.NewWatcher()
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if err != nil {
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return nil, errors.Wrap(err, "failed to create fsnotify watcher")
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}
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if err := os.MkdirAll(confDir, 0700); err != nil {
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return nil, errors.Wrapf(err, "failed to create cni conf dir=%s for watch", confDir)
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}
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if err := watcher.Add(confDir); err != nil {
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return nil, errors.Wrapf(err, "failed to watch cni conf dir %s", confDir)
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}
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syncer := &cniNetConfSyncer{
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watcher: watcher,
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confDir: confDir,
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netPlugin: netPlugin,
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loadOpts: loadOpts,
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}
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if err := syncer.netPlugin.Load(syncer.loadOpts...); err != nil {
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logrus.WithError(err).Error("failed to load cni during init, please check CRI plugin status before setting up network for pods")
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syncer.updateLastStatus(err)
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}
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return syncer, nil
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}
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// syncLoop monitors any fs change events from cni conf dir and tries to reload
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// cni configuration.
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func (syncer *cniNetConfSyncer) syncLoop() error {
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for {
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select {
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case event := <-syncer.watcher.Events:
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// Only reload config when receiving write/rename/remove
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// events
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//
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// TODO(fuweid): Might only reload target cni config
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// files to prevent no-ops.
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if event.Op&(fsnotify.Chmod|fsnotify.Create) > 0 {
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logrus.Debugf("ignore event from cni conf dir: %s", event)
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continue
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}
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logrus.Debugf("receiving change event from cni conf dir: %s", event)
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lerr := syncer.netPlugin.Load(syncer.loadOpts...)
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if lerr != nil {
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logrus.WithError(lerr).
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Errorf("failed to reload cni configuration after receiving fs change event(%s)", event)
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}
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syncer.updateLastStatus(lerr)
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case err := <-syncer.watcher.Errors:
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if err != nil {
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logrus.WithError(err).Error("failed to continue sync cni conf change")
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return err
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}
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}
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}
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}
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// lastStatus retrieves last sync status.
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func (syncer *cniNetConfSyncer) lastStatus() error {
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syncer.RLock()
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defer syncer.RUnlock()
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return syncer.lastSyncStatus
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}
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// updateLastStatus will be called after every single cni load.
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func (syncer *cniNetConfSyncer) updateLastStatus(err error) {
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syncer.Lock()
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defer syncer.Unlock()
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syncer.lastSyncStatus = err
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}
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// stop stops watcher in the syncLoop.
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func (syncer *cniNetConfSyncer) stop() error {
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return syncer.watcher.Close()
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}
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