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service.go
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service.go
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package service
import (
"fmt"
"strings"
"time"
"golang.org/x/net/context"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/filters"
"github.com/docker/docker/api/types/network"
"github.com/docker/docker/client"
"github.com/docker/go-connections/nat"
"github.com/docker/libcompose/config"
"github.com/docker/libcompose/docker/auth"
"github.com/docker/libcompose/docker/builder"
composeclient "github.com/docker/libcompose/docker/client"
"github.com/docker/libcompose/docker/container"
"github.com/docker/libcompose/docker/ctx"
"github.com/docker/libcompose/docker/image"
"github.com/docker/libcompose/labels"
"github.com/docker/libcompose/project"
"github.com/docker/libcompose/project/events"
"github.com/docker/libcompose/project/options"
"github.com/docker/libcompose/utils"
"github.com/docker/libcompose/yaml"
)
// Service is a project.Service implementations.
type Service struct {
name string
project *project.Project
serviceConfig *config.ServiceConfig
clientFactory composeclient.Factory
authLookup auth.Lookup
// FIXME(vdemeester) remove this at some point
context *ctx.Context
}
// NewService creates a service
func NewService(name string, serviceConfig *config.ServiceConfig, context *ctx.Context) *Service {
return &Service{
name: name,
project: context.Project,
serviceConfig: serviceConfig,
clientFactory: context.ClientFactory,
authLookup: context.AuthLookup,
context: context,
}
}
// Name returns the service name.
func (s *Service) Name() string {
return s.name
}
// Config returns the configuration of the service (config.ServiceConfig).
func (s *Service) Config() *config.ServiceConfig {
return s.serviceConfig
}
// DependentServices returns the dependent services (as an array of ServiceRelationship) of the service.
func (s *Service) DependentServices() []project.ServiceRelationship {
return DefaultDependentServices(s.project, s)
}
// Create implements Service.Create. It ensures the image exists or build it
// if it can and then create a container.
func (s *Service) Create(ctx context.Context, options options.Create) error {
containers, err := s.collectContainers(ctx)
if err != nil {
return err
}
if err := s.ensureImageExists(ctx, options.NoBuild, options.ForceBuild); err != nil {
return err
}
if len(containers) != 0 {
return s.eachContainer(ctx, containers, func(c *container.Container) error {
_, err := s.recreateIfNeeded(ctx, c, options.NoRecreate, options.ForceRecreate)
return err
})
}
namer, err := s.namer(ctx, 1)
if err != nil {
return err
}
_, err = s.createContainer(ctx, namer, "", nil, false)
return err
}
func (s *Service) namer(ctx context.Context, count int) (Namer, error) {
var namer Namer
var err error
if s.serviceConfig.ContainerName != "" {
if count > 1 {
logrus.Warnf(`The "%s" service is using the custom container name "%s". Docker requires each container to have a unique name. Remove the custom name to scale the service.`, s.name, s.serviceConfig.ContainerName)
}
namer = NewSingleNamer(s.serviceConfig.ContainerName)
} else {
client := s.clientFactory.Create(s)
namer, err = NewNamer(ctx, client, s.project.Name, s.name, false)
if err != nil {
return nil, err
}
}
return namer, nil
}
func (s *Service) collectContainers(ctx context.Context) ([]*container.Container, error) {
client := s.clientFactory.Create(s)
containers, err := container.ListByFilter(ctx, client, labels.SERVICE.Eq(s.name), labels.PROJECT.Eq(s.project.Name))
if err != nil {
return nil, err
}
result := []*container.Container{}
for _, cont := range containers {
c, err := container.New(ctx, client, cont.ID)
if err != nil {
return nil, err
}
result = append(result, c)
}
return result, nil
}
func (s *Service) ensureImageExists(ctx context.Context, noBuild bool, forceBuild bool) error {
if forceBuild {
return s.build(ctx, options.Build{})
}
exists, err := image.Exists(ctx, s.clientFactory.Create(s), s.imageName())
if err != nil {
return err
}
if exists {
return nil
}
if s.Config().Build.Context != "" {
if noBuild {
return fmt.Errorf("Service %q needs to be built, but no-build was specified", s.name)
}
return s.build(ctx, options.Build{})
}
return s.Pull(ctx)
}
func (s *Service) imageName() string {
if s.Config().Image != "" {
return s.Config().Image
}
return fmt.Sprintf("%s_%s", s.project.Name, s.Name())
}
// Build implements Service.Build. It will try to build the image and returns an error if any.
func (s *Service) Build(ctx context.Context, buildOptions options.Build) error {
return s.build(ctx, buildOptions)
}
func (s *Service) build(ctx context.Context, buildOptions options.Build) error {
if s.Config().Build.Context == "" {
return fmt.Errorf("Specified service does not have a build section")
}
builder := &builder.DaemonBuilder{
Client: s.clientFactory.Create(s),
ContextDirectory: s.Config().Build.Context,
Dockerfile: s.Config().Build.Dockerfile,
BuildArgs: s.Config().Build.Args,
AuthConfigs: s.authLookup.All(),
NoCache: buildOptions.NoCache,
ForceRemove: buildOptions.ForceRemove,
Pull: buildOptions.Pull,
LoggerFactory: s.context.LoggerFactory,
}
return builder.Build(ctx, s.imageName())
}
func (s *Service) constructContainers(ctx context.Context, count int) ([]*container.Container, error) {
result, err := s.collectContainers(ctx)
if err != nil {
return nil, err
}
client := s.clientFactory.Create(s)
var namer Namer
if s.serviceConfig.ContainerName != "" {
if count > 1 {
logrus.Warnf(`The "%s" service is using the custom container name "%s". Docker requires each container to have a unique name. Remove the custom name to scale the service.`, s.name, s.serviceConfig.ContainerName)
}
namer = NewSingleNamer(s.serviceConfig.ContainerName)
} else {
namer, err = NewNamer(ctx, client, s.project.Name, s.name, false)
if err != nil {
return nil, err
}
}
for i := len(result); i < count; i++ {
c, err := s.createContainer(ctx, namer, "", nil, false)
if err != nil {
return nil, err
}
// FIXME(vdemeester) use property/method instead
id, _ := c.ID()
logrus.Debugf("Created container %s: %v", id, c.Name())
result = append(result, c)
}
return result, nil
}
// Up implements Service.Up. It builds the image if needed, creates a container
// and start it.
func (s *Service) Up(ctx context.Context, options options.Up) error {
containers, err := s.collectContainers(ctx)
if err != nil {
return err
}
var imageName = s.imageName()
if len(containers) == 0 || !options.NoRecreate {
if err = s.ensureImageExists(ctx, options.NoBuild, options.ForceBuild); err != nil {
return err
}
}
return s.up(ctx, imageName, true, options)
}
// Run implements Service.Run. It runs a one of command within the service container.
// It always create a new container.
func (s *Service) Run(ctx context.Context, commandParts []string, options options.Run) (int, error) {
err := s.ensureImageExists(ctx, false, false)
if err != nil {
return -1, err
}
client := s.clientFactory.Create(s)
namer, err := NewNamer(ctx, client, s.project.Name, s.name, true)
if err != nil {
return -1, err
}
configOverride := &config.ServiceConfig{Command: commandParts, Tty: true, StdinOpen: true}
c, err := s.createContainer(ctx, namer, "", configOverride, true)
if err != nil {
return -1, err
}
if err := s.connectContainerToNetworks(ctx, c, true); err != nil {
return -1, err
}
if options.Detached {
logrus.Infof("%s", c.Name())
return 0, c.Start(ctx)
}
return c.Run(ctx, configOverride)
}
// Info implements Service.Info. It returns an project.InfoSet with the containers
// related to this service (can be multiple if using the scale command).
func (s *Service) Info(ctx context.Context) (project.InfoSet, error) {
result := project.InfoSet{}
containers, err := s.collectContainers(ctx)
if err != nil {
return nil, err
}
for _, c := range containers {
info, err := c.Info(ctx)
if err != nil {
return nil, err
}
result = append(result, info)
}
return result, nil
}
// Start implements Service.Start. It tries to start a container without creating it.
func (s *Service) Start(ctx context.Context) error {
return s.collectContainersAndDo(ctx, func(c *container.Container) error {
if err := s.connectContainerToNetworks(ctx, c, false); err != nil {
return err
}
return c.Start(ctx)
})
}
func (s *Service) up(ctx context.Context, imageName string, create bool, options options.Up) error {
containers, err := s.collectContainers(ctx)
if err != nil {
return err
}
logrus.Debugf("Found %d existing containers for service %s", len(containers), s.name)
if len(containers) == 0 && create {
namer, err := s.namer(ctx, 1)
if err != nil {
return err
}
c, err := s.createContainer(ctx, namer, "", nil, false)
if err != nil {
return err
}
containers = []*container.Container{c}
}
return s.eachContainer(ctx, containers, func(c *container.Container) error {
var err error
if create {
c, err = s.recreateIfNeeded(ctx, c, options.NoRecreate, options.ForceRecreate)
if err != nil {
return err
}
}
if err := s.connectContainerToNetworks(ctx, c, false); err != nil {
return err
}
err = c.Start(ctx)
if err == nil {
s.project.Notify(events.ContainerStarted, s.name, map[string]string{
"name": c.Name(),
})
}
return err
})
}
func (s *Service) connectContainerToNetworks(ctx context.Context, c *container.Container, oneOff bool) error {
connectedNetworks, err := c.Networks()
if err != nil {
return nil
}
if s.serviceConfig.Networks != nil {
for _, network := range s.serviceConfig.Networks.Networks {
existingNetwork, ok := connectedNetworks[network.Name]
if ok {
// FIXME(vdemeester) implement alias checking (to not disconnect/reconnect for nothing)
aliasPresent := false
for _, alias := range existingNetwork.Aliases {
// FIXME(vdemeester) use shortID instead of ID
ID, _ := c.ID()
if alias == ID {
aliasPresent = true
}
}
if aliasPresent {
continue
}
if err := s.NetworkDisconnect(ctx, c, network, oneOff); err != nil {
return err
}
}
if err := s.NetworkConnect(ctx, c, network, oneOff); err != nil {
return err
}
}
}
return nil
}
// NetworkDisconnect disconnects the container from the specified network
func (s *Service) NetworkDisconnect(ctx context.Context, c *container.Container, net *yaml.Network, oneOff bool) error {
containerID, _ := c.ID()
client := s.clientFactory.Create(s)
return client.NetworkDisconnect(ctx, net.RealName, containerID, true)
}
// NetworkConnect connects the container to the specified network
// FIXME(vdemeester) will be refactor with Container refactoring
func (s *Service) NetworkConnect(ctx context.Context, c *container.Container, net *yaml.Network, oneOff bool) error {
containerID, _ := c.ID()
client := s.clientFactory.Create(s)
internalLinks, err := s.getLinks()
if err != nil {
return err
}
links := []string{}
// TODO(vdemeester) handle link to self (?)
for k, v := range internalLinks {
links = append(links, strings.Join([]string{v, k}, ":"))
}
for _, v := range s.serviceConfig.ExternalLinks {
links = append(links, v)
}
aliases := []string{}
if !oneOff {
aliases = []string{s.Name()}
}
aliases = append(aliases, net.Aliases...)
return client.NetworkConnect(ctx, net.RealName, containerID, &network.EndpointSettings{
Aliases: aliases,
Links: links,
IPAddress: net.IPv4Address,
IPAMConfig: &network.EndpointIPAMConfig{
IPv4Address: net.IPv4Address,
IPv6Address: net.IPv6Address,
},
})
}
func (s *Service) recreateIfNeeded(ctx context.Context, c *container.Container, noRecreate, forceRecreate bool) (*container.Container, error) {
if noRecreate {
return c, nil
}
outOfSync, err := s.OutOfSync(ctx, c)
if err != nil {
return c, err
}
logrus.WithFields(logrus.Fields{
"outOfSync": outOfSync,
"ForceRecreate": forceRecreate,
"NoRecreate": noRecreate}).Debug("Going to decide if recreate is needed")
if forceRecreate || outOfSync {
logrus.Infof("Recreating %s", s.name)
newContainer, err := s.recreate(ctx, c)
if err != nil {
return c, err
}
return newContainer, nil
}
return c, err
}
func (s *Service) recreate(ctx context.Context, c *container.Container) (*container.Container, error) {
name := c.Name()
id, _ := c.ID()
newName := fmt.Sprintf("%s_%s", name, id[:12])
logrus.Debugf("Renaming %s => %s", name, newName)
if err := c.Rename(ctx, newName); err != nil {
logrus.Errorf("Failed to rename old container %s", c.Name())
return nil, err
}
namer := NewSingleNamer(name)
newContainer, err := s.createContainer(ctx, namer, id, nil, false)
if err != nil {
return nil, err
}
newID, _ := newContainer.ID()
logrus.Debugf("Created replacement container %s", newID)
if err := c.Remove(ctx, false); err != nil {
logrus.Errorf("Failed to remove old container %s", c.Name())
return nil, err
}
logrus.Debugf("Removed old container %s %s", c.Name(), id)
return newContainer, nil
}
// OutOfSync checks if the container is out of sync with the service definition.
// It looks if the the service hash container label is the same as the computed one.
func (s *Service) OutOfSync(ctx context.Context, c *container.Container) (bool, error) {
if c.ImageConfig() != s.serviceConfig.Image {
logrus.Debugf("Images for %s do not match %s!=%s", c.Name(), c.ImageConfig(), s.serviceConfig.Image)
return true, nil
}
expectedHash := config.GetServiceHash(s.name, s.Config())
if c.Hash() != expectedHash {
logrus.Debugf("Hashes for %s do not match %s!=%s", c.Name(), c.Hash(), expectedHash)
return true, nil
}
image, err := image.InspectImage(ctx, s.clientFactory.Create(s), c.ImageConfig())
if err != nil {
if client.IsErrImageNotFound(err) {
logrus.Debugf("Image %s do not exist, do not know if it's out of sync", c.Image())
return false, nil
}
return false, err
}
logrus.Debugf("Checking existing image name vs id: %s == %s", image.ID, c.Image())
return image.ID != c.Image(), err
}
func (s *Service) collectContainersAndDo(ctx context.Context, action func(*container.Container) error) error {
containers, err := s.collectContainers(ctx)
if err != nil {
return err
}
return s.eachContainer(ctx, containers, action)
}
func (s *Service) eachContainer(ctx context.Context, containers []*container.Container, action func(*container.Container) error) error {
tasks := utils.InParallel{}
for _, cont := range containers {
task := func(cont *container.Container) func() error {
return func() error {
return action(cont)
}
}(cont)
tasks.Add(task)
}
return tasks.Wait()
}
// Stop implements Service.Stop. It stops any containers related to the service.
func (s *Service) Stop(ctx context.Context, timeout int) error {
return s.collectContainersAndDo(ctx, func(c *container.Container) error {
return c.Stop(ctx, timeout)
})
}
// Restart implements Service.Restart. It restarts any containers related to the service.
func (s *Service) Restart(ctx context.Context, timeout int) error {
return s.collectContainersAndDo(ctx, func(c *container.Container) error {
return c.Restart(ctx, timeout)
})
}
// Kill implements Service.Kill. It kills any containers related to the service.
func (s *Service) Kill(ctx context.Context, signal string) error {
return s.collectContainersAndDo(ctx, func(c *container.Container) error {
return c.Kill(ctx, signal)
})
}
// Delete implements Service.Delete. It removes any containers related to the service.
func (s *Service) Delete(ctx context.Context, options options.Delete) error {
return s.collectContainersAndDo(ctx, func(c *container.Container) error {
running, _ := c.IsRunning(ctx)
if !running || options.RemoveRunning {
return c.Remove(ctx, options.RemoveVolume)
}
return nil
})
}
// Log implements Service.Log. It returns the docker logs for each container related to the service.
func (s *Service) Log(ctx context.Context, follow bool) error {
return s.collectContainersAndDo(ctx, func(c *container.Container) error {
containerNumber, err := c.Number()
if err != nil {
return err
}
name := fmt.Sprintf("%s_%d", s.name, containerNumber)
if s.Config().ContainerName != "" {
name = s.Config().ContainerName
}
l := s.context.LoggerFactory.CreateContainerLogger(name)
return c.Log(ctx, l, follow)
})
}
// Scale implements Service.Scale. It creates or removes containers to have the specified number
// of related container to the service to run.
func (s *Service) Scale(ctx context.Context, scale int, timeout int) error {
if s.specificiesHostPort() {
logrus.Warnf("The \"%s\" service specifies a port on the host. If multiple containers for this service are created on a single host, the port will clash.", s.Name())
}
containers, err := s.collectContainers(ctx)
if err != nil {
return err
}
if len(containers) > scale {
foundCount := 0
for _, c := range containers {
foundCount++
if foundCount > scale {
if err := c.Stop(ctx, timeout); err != nil {
return err
}
// FIXME(vdemeester) remove volume in scale by default ?
if err := c.Remove(ctx, false); err != nil {
return err
}
}
}
}
if err != nil {
return err
}
if len(containers) < scale {
err := s.ensureImageExists(ctx, false, false)
if err != nil {
return err
}
if _, err = s.constructContainers(ctx, scale); err != nil {
return err
}
}
return s.up(ctx, "", false, options.Up{})
}
// Pull implements Service.Pull. It pulls the image of the service and skip the service that
// would need to be built.
func (s *Service) Pull(ctx context.Context) error {
if s.Config().Image == "" {
return nil
}
return image.PullImage(ctx, s.clientFactory.Create(s), s.name, s.authLookup, s.Config().Image)
}
// Pause implements Service.Pause. It puts into pause the container(s) related
// to the service.
func (s *Service) Pause(ctx context.Context) error {
return s.collectContainersAndDo(ctx, func(c *container.Container) error {
return c.Pause(ctx)
})
}
// Unpause implements Service.Pause. It brings back from pause the container(s)
// related to the service.
func (s *Service) Unpause(ctx context.Context) error {
return s.collectContainersAndDo(ctx, func(c *container.Container) error {
return c.Unpause(ctx)
})
}
// RemoveImage implements Service.RemoveImage. It removes images used for the service
// depending on the specified type.
func (s *Service) RemoveImage(ctx context.Context, imageType options.ImageType) error {
switch imageType {
case "local":
if s.Config().Image != "" {
return nil
}
return image.RemoveImage(ctx, s.clientFactory.Create(s), s.imageName())
case "all":
return image.RemoveImage(ctx, s.clientFactory.Create(s), s.imageName())
default:
// Don't do a thing, should be validated up-front
return nil
}
}
var eventAttributes = []string{"image", "name"}
// Events implements Service.Events. It listen to all real-time events happening
// for the service, and put them into the specified chan.
func (s *Service) Events(ctx context.Context, evts chan events.ContainerEvent) error {
filter := filters.NewArgs()
filter.Add("label", fmt.Sprintf("%s=%s", labels.PROJECT, s.project.Name))
filter.Add("label", fmt.Sprintf("%s=%s", labels.SERVICE, s.name))
client := s.clientFactory.Create(s)
eventq, errq := client.Events(ctx, types.EventsOptions{
Filters: filter,
})
go func() {
for {
select {
case event := <-eventq:
service := event.Actor.Attributes[labels.SERVICE.Str()]
attributes := map[string]string{}
for _, attr := range eventAttributes {
attributes[attr] = event.Actor.Attributes[attr]
}
e := events.ContainerEvent{
Service: service,
Event: event.Action,
Type: event.Type,
ID: event.Actor.ID,
Time: time.Unix(event.Time, 0),
Attributes: attributes,
}
evts <- e
}
}
}()
return <-errq
}
// Containers implements Service.Containers. It returns the list of containers
// that are related to the service.
func (s *Service) Containers(ctx context.Context) ([]project.Container, error) {
result := []project.Container{}
containers, err := s.collectContainers(ctx)
if err != nil {
return nil, err
}
for _, c := range containers {
result = append(result, c)
}
return result, nil
}
func (s *Service) specificiesHostPort() bool {
_, bindings, err := nat.ParsePortSpecs(s.Config().Ports)
if err != nil {
fmt.Println(err)
}
for _, portBindings := range bindings {
for _, portBinding := range portBindings {
if portBinding.HostPort != "" {
return true
}
}
}
return false
}