docker-compose/local/compose/create.go

/*
   Copyright 2020 Docker Compose CLI 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 compose

import (
	"context"
	"fmt"
	"path/filepath"
	"strconv"
	"strings"

	convert "github.com/docker/compose-cli/local/moby"
	"github.com/docker/compose-cli/progress"

	"github.com/compose-spec/compose-go/types"
	moby "github.com/docker/docker/api/types"
	"github.com/docker/docker/api/types/container"
	"github.com/docker/docker/api/types/mount"
	"github.com/docker/docker/api/types/network"
	"github.com/docker/docker/api/types/strslice"
	volume_api "github.com/docker/docker/api/types/volume"
	"github.com/docker/docker/errdefs"
	"github.com/docker/go-connections/nat"
	"github.com/pkg/errors"
)

func (s *composeService) Create(ctx context.Context, project *types.Project) error {
	err := s.ensureImagesExists(ctx, project)
	if err != nil {
		return err
	}

	for k, network := range project.Networks {
		if !network.External.External && network.Name != "" {
			network.Name = fmt.Sprintf("%s_%s", project.Name, k)
			project.Networks[k] = network
		}
		network.Labels = network.Labels.Add(networkLabel, k)
		network.Labels = network.Labels.Add(projectLabel, project.Name)
		network.Labels = network.Labels.Add(versionLabel, ComposeVersion)
		err := s.ensureNetwork(ctx, network)
		if err != nil {
			return err
		}
	}

	for k, volume := range project.Volumes {
		if !volume.External.External && volume.Name != "" {
			volume.Name = fmt.Sprintf("%s_%s", project.Name, k)
			project.Volumes[k] = volume
		}
		volume.Labels = volume.Labels.Add(volumeLabel, k)
		volume.Labels = volume.Labels.Add(projectLabel, project.Name)
		volume.Labels = volume.Labels.Add(versionLabel, ComposeVersion)
		err := s.ensureVolume(ctx, volume)
		if err != nil {
			return err
		}
	}

	return InDependencyOrder(ctx, project, func(c context.Context, service types.ServiceConfig) error {
		return s.ensureService(c, project, service)
	})
}

func getContainerCreateOptions(p *types.Project, s types.ServiceConfig, number int, inherit *moby.Container) (*container.Config, *container.HostConfig, *network.NetworkingConfig, error) {
	hash, err := jsonHash(s)
	if err != nil {
		return nil, nil, nil, err
	}
	// TODO: change oneoffLabel value for containers started with `docker compose run`
	labels := map[string]string{
		projectLabel:         p.Name,
		serviceLabel:         s.Name,
		versionLabel:         ComposeVersion,
		oneoffLabel:          "False",
		configHashLabel:      hash,
		workingDirLabel:      p.WorkingDir,
		configFilesLabel:     strings.Join(p.ComposeFiles, ","),
		containerNumberLabel: strconv.Itoa(number),
	}

	var (
		runCmd     strslice.StrSlice
		entrypoint strslice.StrSlice
	)
	if len(s.Command) > 0 {
		runCmd = strslice.StrSlice(s.Command)
	}
	if len(s.Entrypoint) > 0 {
		entrypoint = strslice.StrSlice(s.Entrypoint)
	}
	image := s.Image
	if s.Image == "" {
		image = fmt.Sprintf("%s_%s", p.Name, s.Name)
	}

	var (
		tty         = s.Tty
		stdinOpen   = s.StdinOpen
		attachStdin = false
	)

	containerConfig := container.Config{
		Hostname:        s.Hostname,
		Domainname:      s.DomainName,
		User:            s.User,
		ExposedPorts:    buildContainerPorts(s),
		Tty:             tty,
		OpenStdin:       stdinOpen,
		StdinOnce:       true,
		AttachStdin:     attachStdin,
		AttachStderr:    true,
		AttachStdout:    true,
		Cmd:             runCmd,
		Image:           image,
		WorkingDir:      s.WorkingDir,
		Entrypoint:      entrypoint,
		NetworkDisabled: s.NetworkMode == "disabled",
		MacAddress:      s.MacAddress,
		Labels:          labels,
		StopSignal:      s.StopSignal,
		Env:             convert.ToMobyEnv(s.Environment),
		Healthcheck:     convert.ToMobyHealthCheck(s.HealthCheck),
		// Volumes:         // FIXME unclear to me the overlap with HostConfig.Mounts
		StopTimeout: convert.ToSeconds(s.StopGracePeriod),
	}

	mountOptions, err := buildContainerMountOptions(s, inherit)
	if err != nil {
		return nil, nil, nil, err
	}
	bindings := buildContainerBindingOptions(s)

	networkMode := getNetworkMode(p, s)
	hostConfig := container.HostConfig{
		Mounts:         mountOptions,
		CapAdd:         strslice.StrSlice(s.CapAdd),
		CapDrop:        strslice.StrSlice(s.CapDrop),
		NetworkMode:    networkMode,
		Init:           s.Init,
		ReadonlyRootfs: s.ReadOnly,
		// ShmSize: , TODO
		Sysctls:      s.Sysctls,
		PortBindings: bindings,
	}

	networkConfig := buildDefaultNetworkConfig(s, networkMode)
	return &containerConfig, &hostConfig, networkConfig, nil
}

func buildContainerPorts(s types.ServiceConfig) nat.PortSet {
	ports := nat.PortSet{}
	for _, p := range s.Ports {
		p := nat.Port(fmt.Sprintf("%d/%s", p.Target, p.Protocol))
		ports[p] = struct{}{}
	}
	return ports
}

func buildContainerBindingOptions(s types.ServiceConfig) nat.PortMap {
	bindings := nat.PortMap{}
	for _, port := range s.Ports {
		p := nat.Port(fmt.Sprintf("%d/%s", port.Target, port.Protocol))
		bind := []nat.PortBinding{}
		binding := nat.PortBinding{}
		if port.Published > 0 {
			binding.HostPort = fmt.Sprint(port.Published)
		}
		bind = append(bind, binding)
		bindings[p] = bind
	}
	return bindings
}

func buildContainerMountOptions(s types.ServiceConfig, inherit *moby.Container) ([]mount.Mount, error) {
	mounts := []mount.Mount{}
	var inherited []string
	if inherit != nil {
		for _, m := range inherit.Mounts {
			if m.Type == "tmpfs" {
				continue
			}
			src := m.Source
			if m.Type == "volume" {
				src = m.Name
			}
			mounts = append(mounts, mount.Mount{
				Type:     m.Type,
				Source:   src,
				Target:   m.Destination,
				ReadOnly: !m.RW,
			})
			inherited = append(inherited, m.Destination)
		}
	}

	for _, v := range s.Volumes {
		if contains(inherited, v.Target) {
			continue
		}
		mount, err := buildMount(v)
		if err != nil {
			return nil, err
		}
		mounts = append(mounts, mount)
	}
	return mounts, nil
}

func buildMount(volume types.ServiceVolumeConfig) (mount.Mount, error) {
	source := volume.Source
	if volume.Type == "bind" && !filepath.IsAbs(source) {
		// volume source has already been prefixed with workdir if required, by compose-go project loader
		var err error
		source, err = filepath.Abs(source)
		if err != nil {
			return mount.Mount{}, err
		}
	}

	return mount.Mount{
		Type:          mount.Type(volume.Type),
		Source:        source,
		Target:        volume.Target,
		ReadOnly:      volume.ReadOnly,
		Consistency:   mount.Consistency(volume.Consistency),
		BindOptions:   buildBindOption(volume.Bind),
		VolumeOptions: buildVolumeOptions(volume.Volume),
		TmpfsOptions:  buildTmpfsOptions(volume.Tmpfs),
	}, nil
}

func buildBindOption(bind *types.ServiceVolumeBind) *mount.BindOptions {
	if bind == nil {
		return nil
	}
	return &mount.BindOptions{
		Propagation: mount.Propagation(bind.Propagation),
		// NonRecursive: false, FIXME missing from model ?
	}
}

func buildVolumeOptions(vol *types.ServiceVolumeVolume) *mount.VolumeOptions {
	if vol == nil {
		return nil
	}
	return &mount.VolumeOptions{
		NoCopy: vol.NoCopy,
		// Labels:       , // FIXME missing from model ?
		// DriverConfig: , // FIXME missing from model ?
	}
}

func buildTmpfsOptions(tmpfs *types.ServiceVolumeTmpfs) *mount.TmpfsOptions {
	if tmpfs == nil {
		return nil
	}
	return &mount.TmpfsOptions{
		SizeBytes: tmpfs.Size,
		// Mode:      , // FIXME missing from model ?
	}
}

func buildDefaultNetworkConfig(s types.ServiceConfig, networkMode container.NetworkMode) *network.NetworkingConfig {
	config := map[string]*network.EndpointSettings{}
	net := string(networkMode)
	config[net] = &network.EndpointSettings{
		Aliases: getAliases(s, s.Networks[net]),
	}

	return &network.NetworkingConfig{
		EndpointsConfig: config,
	}
}

func getAliases(s types.ServiceConfig, c *types.ServiceNetworkConfig) []string {
	aliases := []string{s.Name}
	if c != nil {
		aliases = append(aliases, c.Aliases...)
	}
	return aliases
}

func getNetworkMode(p *types.Project, service types.ServiceConfig) container.NetworkMode {
	mode := service.NetworkMode
	if mode == "" {
		if len(p.Networks) > 0 {
			for name := range getNetworksForService(service) {
				return container.NetworkMode(p.Networks[name].Name)
			}
		}
		return container.NetworkMode("none")
	}

	// FIXME incomplete implementation
	if strings.HasPrefix(mode, "service:") {
		panic("Not yet implemented")
	}
	if strings.HasPrefix(mode, "container:") {
		panic("Not yet implemented")
	}

	return container.NetworkMode(mode)
}

func getNetworksForService(s types.ServiceConfig) map[string]*types.ServiceNetworkConfig {
	if len(s.Networks) > 0 {
		return s.Networks
	}
	return map[string]*types.ServiceNetworkConfig{"default": nil}
}

func (s *composeService) ensureNetwork(ctx context.Context, n types.NetworkConfig) error {
	_, err := s.apiClient.NetworkInspect(ctx, n.Name, moby.NetworkInspectOptions{})
	if err != nil {
		if errdefs.IsNotFound(err) {
			if n.External.External {
				return fmt.Errorf("network %s declared as external, but could not be found", n.Name)
			}
			createOpts := moby.NetworkCreate{
				// TODO NameSpace Labels
				Labels:     n.Labels,
				Driver:     n.Driver,
				Options:    n.DriverOpts,
				Internal:   n.Internal,
				Attachable: n.Attachable,
			}

			if n.Ipam.Driver != "" || len(n.Ipam.Config) > 0 {
				createOpts.IPAM = &network.IPAM{}
			}

			if n.Ipam.Driver != "" {
				createOpts.IPAM.Driver = n.Ipam.Driver
			}

			for _, ipamConfig := range n.Ipam.Config {
				config := network.IPAMConfig{
					Subnet: ipamConfig.Subnet,
				}
				createOpts.IPAM.Config = append(createOpts.IPAM.Config, config)
			}
			networkEventName := fmt.Sprintf("Network %q", n.Name)
			w := progress.ContextWriter(ctx)
			w.Event(progress.CreatingEvent(networkEventName))
			if _, err := s.apiClient.NetworkCreate(ctx, n.Name, createOpts); err != nil {
				w.Event(progress.ErrorEvent(networkEventName))
				return errors.Wrapf(err, "failed to create network %s", n.Name)
			}
			w.Event(progress.CreatedEvent(networkEventName))
			return nil
		}
		return err
	}
	return nil
}

func (s *composeService) ensureNetworkDown(ctx context.Context, networkID string, networkName string) error {
	w := progress.ContextWriter(ctx)
	eventName := fmt.Sprintf("Network %q", networkName)
	w.Event(progress.RemovingEvent(eventName))

	if err := s.apiClient.NetworkRemove(ctx, networkID); err != nil {
		w.Event(progress.ErrorEvent(eventName))
		return errors.Wrapf(err, fmt.Sprintf("failed to create network %s", networkID))
	}

	w.Event(progress.RemovedEvent(eventName))
	return nil
}

func (s *composeService) ensureVolume(ctx context.Context, volume types.VolumeConfig) error {
	// TODO could identify volume by label vs name
	_, err := s.apiClient.VolumeInspect(ctx, volume.Name)
	if err != nil {
		if !errdefs.IsNotFound(err) {
			return err
		}
		eventName := fmt.Sprintf("Volume %q", volume.Name)
		w := progress.ContextWriter(ctx)
		w.Event(progress.CreatingEvent(eventName))
		// TODO we miss support for driver_opts and labels
		_, err := s.apiClient.VolumeCreate(ctx, volume_api.VolumeCreateBody{
			Labels:     volume.Labels,
			Name:       volume.Name,
			Driver:     volume.Driver,
			DriverOpts: volume.DriverOpts,
		})
		if err != nil {
			w.Event(progress.ErrorEvent(eventName))
			return err
		}
		w.Event(progress.CreatedEvent(eventName))
	}
	return nil
}