Move runtime to core/runtime
Signed-off-by: Derek McGowan <derek@mcg.dev>
This commit is contained in:
Derek McGowan
219
core/runtime/restart/restart.go
Normal file
219
core/runtime/restart/restart.go
Normal file
@@ -0,0 +1,219 @@
|
||||
/*
|
||||
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 restart enables containers to have labels added and monitored to
|
||||
// keep the container's task running if it is killed.
|
||||
//
|
||||
// Setting the StatusLabel on a container instructs the restart monitor to keep
|
||||
// that container's task in a specific status.
|
||||
// Setting the LogPathLabel on a container will setup the task's IO to be redirected
|
||||
// to a log file when running a task within the restart manager.
|
||||
//
|
||||
// The restart labels can be cleared off of a container using the WithNoRestarts Opt.
|
||||
//
|
||||
// The restart monitor has one option in the containerd config under the [plugins.restart]
|
||||
// section. `interval = "10s" sets the reconcile interval that the restart monitor checks
|
||||
// for task state and reconciles the desired status for that task.
|
||||
package restart
|
||||
|
||||
import (
|
||||
"context"
|
||||
"fmt"
|
||||
"net/url"
|
||||
"strconv"
|
||||
"strings"
|
||||
|
||||
containerd "github.com/containerd/containerd/v2/client"
|
||||
"github.com/containerd/containerd/v2/core/containers"
|
||||
"github.com/containerd/containerd/v2/pkg/cio"
|
||||
"github.com/containerd/log"
|
||||
)
|
||||
|
||||
const (
|
||||
// StatusLabel sets the restart status label for a container
|
||||
StatusLabel = "containerd.io/restart.status"
|
||||
// LogURILabel sets the restart log uri label for a container
|
||||
LogURILabel = "containerd.io/restart.loguri"
|
||||
|
||||
// PolicyLabel sets the restart policy label for a container
|
||||
PolicyLabel = "containerd.io/restart.policy"
|
||||
// CountLabel sets the restart count label for a container
|
||||
CountLabel = "containerd.io/restart.count"
|
||||
// ExplicitlyStoppedLabel sets the restart explicitly stopped label for a container
|
||||
ExplicitlyStoppedLabel = "containerd.io/restart.explicitly-stopped"
|
||||
)
|
||||
|
||||
// Policy represents the restart policies of a container.
|
||||
type Policy struct {
|
||||
name string
|
||||
maximumRetryCount int
|
||||
}
|
||||
|
||||
// NewPolicy creates a restart policy with the specified name.
|
||||
// supports the following restart policies:
|
||||
// - no, Do not restart the container.
|
||||
// - always, Always restart the container regardless of the exit status.
|
||||
// - on-failure[:max-retries], Restart only if the container exits with a non-zero exit status.
|
||||
// - unless-stopped, Always restart the container unless it is stopped.
|
||||
func NewPolicy(policy string) (*Policy, error) {
|
||||
policySlice := strings.Split(policy, ":")
|
||||
var (
|
||||
err error
|
||||
retryCount int
|
||||
)
|
||||
switch policySlice[0] {
|
||||
case "", "no", "always", "unless-stopped":
|
||||
policy = policySlice[0]
|
||||
if policy == "" {
|
||||
policy = "always"
|
||||
}
|
||||
if len(policySlice) > 1 {
|
||||
return nil, fmt.Errorf("restart policy %q not support max retry count", policySlice[0])
|
||||
}
|
||||
case "on-failure":
|
||||
policy = policySlice[0]
|
||||
if len(policySlice) > 1 {
|
||||
retryCount, err = strconv.Atoi(policySlice[1])
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("invalid max retry count: %s", policySlice[1])
|
||||
}
|
||||
}
|
||||
default:
|
||||
return nil, fmt.Errorf("restart policy %q not supported", policy)
|
||||
}
|
||||
return &Policy{
|
||||
name: policy,
|
||||
maximumRetryCount: retryCount,
|
||||
}, nil
|
||||
}
|
||||
|
||||
func (rp *Policy) String() string {
|
||||
if rp.maximumRetryCount > 0 {
|
||||
return fmt.Sprintf("%s:%d", rp.name, rp.maximumRetryCount)
|
||||
}
|
||||
return rp.name
|
||||
}
|
||||
|
||||
func (rp *Policy) Name() string {
|
||||
return rp.name
|
||||
}
|
||||
|
||||
func (rp *Policy) MaximumRetryCount() int {
|
||||
return rp.maximumRetryCount
|
||||
}
|
||||
|
||||
// Reconcile reconciles the restart policy of a container.
|
||||
func Reconcile(status containerd.Status, labels map[string]string) bool {
|
||||
rp, err := NewPolicy(labels[PolicyLabel])
|
||||
if err != nil {
|
||||
log.L.WithError(err).Error("policy reconcile")
|
||||
return false
|
||||
}
|
||||
switch rp.Name() {
|
||||
case "", "always":
|
||||
return true
|
||||
case "on-failure":
|
||||
restartCount, err := strconv.Atoi(labels[CountLabel])
|
||||
if err != nil && labels[CountLabel] != "" {
|
||||
log.L.WithError(err).Error("policy reconcile")
|
||||
return false
|
||||
}
|
||||
if status.ExitStatus != 0 && (rp.maximumRetryCount == 0 || restartCount < rp.maximumRetryCount) {
|
||||
return true
|
||||
}
|
||||
case "unless-stopped":
|
||||
explicitlyStopped, _ := strconv.ParseBool(labels[ExplicitlyStoppedLabel])
|
||||
if !explicitlyStopped {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
// WithLogURI sets the specified log uri for a container.
|
||||
func WithLogURI(uri *url.URL) func(context.Context, *containerd.Client, *containers.Container) error {
|
||||
return WithLogURIString(uri.String())
|
||||
}
|
||||
|
||||
// WithLogURIString sets the specified log uri string for a container.
|
||||
func WithLogURIString(uriString string) func(context.Context, *containerd.Client, *containers.Container) error {
|
||||
return func(_ context.Context, _ *containerd.Client, c *containers.Container) error {
|
||||
ensureLabels(c)
|
||||
c.Labels[LogURILabel] = uriString
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
// WithBinaryLogURI sets the binary-type log uri for a container.
|
||||
//
|
||||
// Deprecated(in release 1.5): use WithLogURI
|
||||
func WithBinaryLogURI(binary string, args map[string]string) func(context.Context, *containerd.Client, *containers.Container) error {
|
||||
uri, err := cio.LogURIGenerator("binary", binary, args)
|
||||
if err != nil {
|
||||
return func(context.Context, *containerd.Client, *containers.Container) error {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return WithLogURI(uri)
|
||||
}
|
||||
|
||||
// WithFileLogURI sets the file-type log uri for a container.
|
||||
//
|
||||
// Deprecated(in release 1.5): use WithLogURI
|
||||
func WithFileLogURI(path string) func(context.Context, *containerd.Client, *containers.Container) error {
|
||||
uri, err := cio.LogURIGenerator("file", path, nil)
|
||||
if err != nil {
|
||||
return func(context.Context, *containerd.Client, *containers.Container) error {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return WithLogURI(uri)
|
||||
}
|
||||
|
||||
// WithStatus sets the status for a container
|
||||
func WithStatus(status containerd.ProcessStatus) func(context.Context, *containerd.Client, *containers.Container) error {
|
||||
return func(_ context.Context, _ *containerd.Client, c *containers.Container) error {
|
||||
ensureLabels(c)
|
||||
c.Labels[StatusLabel] = string(status)
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
// WithPolicy sets the restart policy for a container
|
||||
func WithPolicy(policy *Policy) func(context.Context, *containerd.Client, *containers.Container) error {
|
||||
return func(_ context.Context, _ *containerd.Client, c *containers.Container) error {
|
||||
ensureLabels(c)
|
||||
c.Labels[PolicyLabel] = policy.String()
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
// WithNoRestarts clears any restart information from the container
|
||||
func WithNoRestarts(_ context.Context, _ *containerd.Client, c *containers.Container) error {
|
||||
if c.Labels == nil {
|
||||
return nil
|
||||
}
|
||||
delete(c.Labels, StatusLabel)
|
||||
delete(c.Labels, PolicyLabel)
|
||||
delete(c.Labels, LogURILabel)
|
||||
return nil
|
||||
}
|
||||
|
||||
func ensureLabels(c *containers.Container) {
|
||||
if c.Labels == nil {
|
||||
c.Labels = make(map[string]string)
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user