mirror of
https://github.com/offen/docker-volume-backup.git
synced 2024-09-20 05:30:26 +02:00
303 lines
9.5 KiB
Go
303 lines
9.5 KiB
Go
package main
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"sync"
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"time"
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"github.com/docker/cli/cli/command/service/progress"
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"github.com/docker/docker/api/types"
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ctr "github.com/docker/docker/api/types/container"
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"github.com/docker/docker/api/types/filters"
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"github.com/docker/docker/api/types/swarm"
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"github.com/docker/docker/client"
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)
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func scaleService(cli *client.Client, serviceID string, replicas uint64) ([]string, error) {
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service, _, err := cli.ServiceInspectWithRaw(context.Background(), serviceID, types.ServiceInspectOptions{})
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if err != nil {
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return nil, fmt.Errorf("scaleService: error inspecting service %s: %w", serviceID, err)
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}
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serviceMode := &service.Spec.Mode
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switch {
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case serviceMode.Replicated != nil:
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serviceMode.Replicated.Replicas = &replicas
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default:
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return nil, fmt.Errorf("scaleService: service to be scaled %s has to be in replicated mode", service.Spec.Name)
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}
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response, err := cli.ServiceUpdate(context.Background(), service.ID, service.Version, service.Spec, types.ServiceUpdateOptions{})
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if err != nil {
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return nil, fmt.Errorf("scaleService: error updating service: %w", err)
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}
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discardWriter := &noopWriteCloser{io.Discard}
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if err := progress.ServiceProgress(context.Background(), cli, service.ID, discardWriter); err != nil {
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return nil, err
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}
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return response.Warnings, nil
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}
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func awaitContainerCountForService(cli *client.Client, serviceID string, count int) error {
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for {
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containers, err := cli.ContainerList(context.Background(), types.ContainerListOptions{
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Filters: filters.NewArgs(filters.KeyValuePair{
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Key: "label",
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Value: fmt.Sprintf("com.docker.swarm.service.id=%s", serviceID),
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}),
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})
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if err != nil {
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return fmt.Errorf("awaitContainerCount: error listing containers: %w", err)
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}
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if len(containers) == count {
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break
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}
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time.Sleep(time.Second)
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}
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return nil
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}
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// stopContainersAndServices stops all Docker containers that are marked as to being
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// stopped during the backup and returns a function that can be called to
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// restart everything that has been stopped.
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func (s *script) stopContainersAndServices() (func() error, error) {
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if s.cli == nil {
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return noop, nil
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}
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dockerInfo, err := s.cli.Info(context.Background())
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if err != nil {
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return noop, fmt.Errorf("(*script).stopContainersAndServices: error getting docker info: %w", err)
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}
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isDockerSwarm := dockerInfo.Swarm.LocalNodeState != "inactive"
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filterMatchLabel := fmt.Sprintf(
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"docker-volume-backup.stop-during-backup=%s",
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s.c.BackupStopContainerLabel,
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)
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allContainers, err := s.cli.ContainerList(context.Background(), types.ContainerListOptions{})
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if err != nil {
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return noop, fmt.Errorf("(*script).stopContainersAndServices: error querying for containers: %w", err)
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}
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containersToStop, err := s.cli.ContainerList(context.Background(), types.ContainerListOptions{
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Filters: filters.NewArgs(filters.KeyValuePair{
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Key: "label",
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Value: filterMatchLabel,
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}),
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})
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if err != nil {
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return noop, fmt.Errorf("(*script).stopContainersAndServices: error querying for containers to stop: %w", err)
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}
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var allServices []swarm.Service
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var servicesToScaleDown []handledSwarmService
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if isDockerSwarm {
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allServices, err = s.cli.ServiceList(context.Background(), types.ServiceListOptions{})
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if err != nil {
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return noop, fmt.Errorf("(*script).stopContainersAndServices: error querying for services: %w", err)
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}
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matchingServices, err := s.cli.ServiceList(context.Background(), types.ServiceListOptions{
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Filters: filters.NewArgs(filters.KeyValuePair{
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Key: "label",
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Value: filterMatchLabel,
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}),
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Status: true,
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})
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for _, s := range matchingServices {
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servicesToScaleDown = append(servicesToScaleDown, handledSwarmService{
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serviceID: s.ID,
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initialReplicaCount: *s.Spec.Mode.Replicated.Replicas,
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})
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}
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if err != nil {
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return noop, fmt.Errorf("(*script).stopContainersAndServices: error querying for services to scale down: %w", err)
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}
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}
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if len(containersToStop) == 0 && len(servicesToScaleDown) == 0 {
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return noop, nil
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}
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if isDockerSwarm {
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for _, container := range containersToStop {
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if swarmServiceID, ok := container.Labels["com.docker.swarm.service.id"]; ok {
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parentService, _, err := s.cli.ServiceInspectWithRaw(context.Background(), swarmServiceID, types.ServiceInspectOptions{})
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if err != nil {
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return noop, fmt.Errorf("(*script).stopContainersAndServices: error querying for parent service with ID %s: %w", swarmServiceID, err)
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}
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for label := range parentService.Spec.Labels {
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if label == "docker-volume-backup.stop-during-backup" {
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return noop, fmt.Errorf(
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"(*script).stopContainersAndServices: container %s is labeled to stop but has parent service %s which is also labeled, cannot continue",
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container.Names[0],
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parentService.Spec.Name,
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)
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}
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}
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}
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}
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}
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s.logger.Info(
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fmt.Sprintf(
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"Stopping %d out of %d running container(s) and scaling down %d out of %d active service(s) as they were labeled %s.",
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len(containersToStop),
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len(allContainers),
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len(servicesToScaleDown),
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len(allServices),
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filterMatchLabel,
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),
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)
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var stoppedContainers []types.Container
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var stopErrors []error
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for _, container := range containersToStop {
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if err := s.cli.ContainerStop(context.Background(), container.ID, ctr.StopOptions{}); err != nil {
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stopErrors = append(stopErrors, err)
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} else {
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stoppedContainers = append(stoppedContainers, container)
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}
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}
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var scaledDownServices []handledSwarmService
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var scaleDownErrors concurrentSlice[error]
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if isDockerSwarm {
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wg := sync.WaitGroup{}
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for _, svc := range servicesToScaleDown {
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wg.Add(1)
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go func(svc handledSwarmService) {
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defer wg.Done()
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warnings, err := scaleService(s.cli, svc.serviceID, 0)
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if err != nil {
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scaleDownErrors.append(err)
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} else {
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scaledDownServices = append(scaledDownServices, svc)
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}
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for _, warning := range warnings {
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s.logger.Warn(
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fmt.Sprintf("The Docker API returned a warning when scaling down service %s: %s", svc.serviceID, warning),
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)
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}
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// progress.ServiceProgress returns too early, so we need to manually check
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// whether all containers belonging to the service have actually been removed
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if err := awaitContainerCountForService(s.cli, svc.serviceID, 0); err != nil {
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scaleDownErrors.append(err)
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}
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}(svc)
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}
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wg.Wait()
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}
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s.stats.Containers = ContainersStats{
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All: uint(len(allContainers)),
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ToStop: uint(len(containersToStop)),
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Stopped: uint(len(stoppedContainers)),
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StopErrors: uint(len(stopErrors)),
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}
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s.stats.Services = ServicesStats{
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All: uint(len(allServices)),
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ToScaleDown: uint(len(servicesToScaleDown)),
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ScaledDown: uint(len(scaledDownServices)),
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ScaleDownErrors: uint(len(scaleDownErrors.value())),
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}
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var initialErr error
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allErrors := append(stopErrors, scaleDownErrors.value()...)
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if len(allErrors) != 0 {
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initialErr = fmt.Errorf(
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"(*script).stopContainersAndServices: %d error(s) stopping containers: %w",
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len(allErrors),
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errors.Join(allErrors...),
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)
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}
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return func() error {
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servicesRequiringForceUpdate := map[string]struct{}{}
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var restartErrors []error
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for _, container := range stoppedContainers {
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// in case a container was part of a swarm service, teh service requires to
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// be force updated instead of restarting the container as it would otherwise
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// remain in a "completed" state
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if swarmServiceName, ok := container.Labels["com.docker.swarm.service.name"]; ok {
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servicesRequiringForceUpdate[swarmServiceName] = struct{}{}
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continue
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}
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if err := s.cli.ContainerStart(context.Background(), container.ID, types.ContainerStartOptions{}); err != nil {
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restartErrors = append(restartErrors, err)
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}
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}
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if len(servicesRequiringForceUpdate) != 0 {
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services, _ := s.cli.ServiceList(context.Background(), types.ServiceListOptions{})
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for serviceName := range servicesRequiringForceUpdate {
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var serviceMatch swarm.Service
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for _, service := range services {
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if service.Spec.Name == serviceName {
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serviceMatch = service
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break
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}
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}
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if serviceMatch.ID == "" {
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restartErrors = append(
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restartErrors,
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fmt.Errorf("(*script).stopContainersAndServices: couldn't find service with name %s", serviceName),
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)
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continue
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}
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serviceMatch.Spec.TaskTemplate.ForceUpdate += 1
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if _, err := s.cli.ServiceUpdate(
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context.Background(), serviceMatch.ID,
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serviceMatch.Version, serviceMatch.Spec, types.ServiceUpdateOptions{},
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); err != nil {
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restartErrors = append(restartErrors, err)
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}
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}
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}
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var scaleUpErrors concurrentSlice[error]
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if isDockerSwarm {
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wg := &sync.WaitGroup{}
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for _, svc := range servicesToScaleDown {
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wg.Add(1)
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go func(svc handledSwarmService) {
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defer wg.Done()
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warnings, err := scaleService(s.cli, svc.serviceID, svc.initialReplicaCount)
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if err != nil {
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scaleDownErrors.append(err)
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return
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}
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for _, warning := range warnings {
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s.logger.Warn(
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fmt.Sprintf("The Docker API returned a warning when scaling up service %s: %s", svc.serviceID, warning),
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)
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}
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}(svc)
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}
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wg.Wait()
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}
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allErrors := append(restartErrors, scaleUpErrors.value()...)
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if len(allErrors) != 0 {
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return fmt.Errorf(
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"stopContainers: %d error(s) restarting containers and services: %w",
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len(allErrors),
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errors.Join(allErrors...),
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)
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}
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s.logger.Info(
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fmt.Sprintf(
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"Restarted %d container(s) and %d service(s).",
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len(stoppedContainers),
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len(scaledDownServices),
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),
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)
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return nil
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}, initialErr
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}
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