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change.go
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change.go
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/*
Copyright The containerd 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 monitor
import (
"context"
"fmt"
"net/url"
"strconv"
"syscall"
"github.com/containerd/containerd"
"github.com/containerd/containerd/cio"
"github.com/containerd/containerd/runtime/restart"
"github.com/sirupsen/logrus"
)
type stopChange struct {
container containerd.Container
}
func (s *stopChange) apply(ctx context.Context, client *containerd.Client) error {
return killTask(ctx, s.container)
}
type startChange struct {
container containerd.Container
logURI string
count int
// Deprecated(in release 1.5): but recognized now, prefer to use logURI
logPath string
}
func (s *startChange) apply(ctx context.Context, client *containerd.Client) error {
log := cio.NullIO
if s.logURI != "" {
uri, err := url.Parse(s.logURI)
if err != nil {
return fmt.Errorf("failed to parse %v into url: %w", s.logURI, err)
}
log = cio.LogURI(uri)
} else if s.logPath != "" {
log = cio.LogFile(s.logPath)
}
if s.logURI != "" && s.logPath != "" {
logrus.Warnf("LogPathLabel=%v has been deprecated, using LogURILabel=%v",
s.logPath, s.logURI)
}
if s.count > 0 {
labels := map[string]string{
restart.CountLabel: strconv.Itoa(s.count),
}
opt := containerd.WithAdditionalContainerLabels(labels)
if err := s.container.Update(ctx, containerd.UpdateContainerOpts(opt)); err != nil {
return err
}
}
killTask(ctx, s.container)
task, err := s.container.NewTask(ctx, log)
if err != nil {
return err
}
return task.Start(ctx)
}
func killTask(ctx context.Context, container containerd.Container) error {
task, err := container.Task(ctx, nil)
if err == nil {
wait, err := task.Wait(ctx)
if err != nil {
if _, derr := task.Delete(ctx); derr == nil {
return nil
}
return err
}
if err := task.Kill(ctx, syscall.SIGKILL, containerd.WithKillAll); err != nil {
if _, derr := task.Delete(ctx); derr == nil {
return nil
}
return err
}
<-wait
if _, err := task.Delete(ctx); err != nil {
return err
}
}
return nil
}