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adapter.go
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/
adapter.go
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package container
import (
"encoding/base64"
"encoding/json"
"fmt"
"io"
"strings"
"syscall"
"github.com/Sirupsen/logrus"
executorpkg "github.com/docker/docker/daemon/cluster/executor"
"github.com/docker/engine-api/types"
"github.com/docker/libnetwork"
"github.com/docker/swarmkit/api"
"github.com/docker/swarmkit/log"
"golang.org/x/net/context"
)
// containerAdapter conducts remote operations for a container. All calls
// are mostly naked calls to the client API, seeded with information from
// containerConfig.
type containerAdapter struct {
backend executorpkg.Backend
container *containerConfig
}
func newContainerAdapter(b executorpkg.Backend, task *api.Task) (*containerAdapter, error) {
ctnr, err := newContainerConfig(task)
if err != nil {
return nil, err
}
return &containerAdapter{
container: ctnr,
backend: b,
}, nil
}
func (c *containerAdapter) pullImage(ctx context.Context) error {
spec := c.container.spec()
// if the image needs to be pulled, the auth config will be retrieved and updated
var encodedAuthConfig string
if spec.PullOptions != nil {
encodedAuthConfig = spec.PullOptions.RegistryAuth
}
authConfig := &types.AuthConfig{}
if encodedAuthConfig != "" {
if err := json.NewDecoder(base64.NewDecoder(base64.URLEncoding, strings.NewReader(encodedAuthConfig))).Decode(authConfig); err != nil {
logrus.Warnf("invalid authconfig: %v", err)
}
}
pr, pw := io.Pipe()
metaHeaders := map[string][]string{}
go func() {
err := c.backend.PullImage(ctx, c.container.image(), "", metaHeaders, authConfig, pw)
pw.CloseWithError(err)
}()
dec := json.NewDecoder(pr)
m := map[string]interface{}{}
for {
if err := dec.Decode(&m); err != nil {
if err == io.EOF {
break
}
return err
}
// TODO(stevvooe): Report this status somewhere.
logrus.Debugln("pull progress", m)
}
// if the final stream object contained an error, return it
if errMsg, ok := m["error"]; ok {
return fmt.Errorf("%v", errMsg)
}
return nil
}
func (c *containerAdapter) createNetworks(ctx context.Context) error {
for _, network := range c.container.networks() {
ncr, err := c.container.networkCreateRequest(network)
if err != nil {
return err
}
if err := c.backend.CreateManagedNetwork(ncr); err != nil { // todo name missing
if _, ok := err.(libnetwork.NetworkNameError); ok {
continue
}
return err
}
}
return nil
}
func (c *containerAdapter) removeNetworks(ctx context.Context) error {
for _, nid := range c.container.networks() {
if err := c.backend.DeleteManagedNetwork(nid); err != nil {
if _, ok := err.(*libnetwork.ActiveEndpointsError); ok {
continue
}
log.G(ctx).Errorf("network %s remove failed: %v", nid, err)
return err
}
}
return nil
}
func (c *containerAdapter) create(ctx context.Context, backend executorpkg.Backend) error {
var cr types.ContainerCreateResponse
var err error
if cr, err = backend.CreateManagedContainer(types.ContainerCreateConfig{
Name: c.container.name(),
Config: c.container.config(),
HostConfig: c.container.hostConfig(),
// Use the first network in container create
NetworkingConfig: c.container.createNetworkingConfig(),
}); err != nil {
return err
}
// Docker daemon currently doesn't support multiple networks in container create
// Connect to all other networks
nc := c.container.connectNetworkingConfig()
if nc != nil {
for n, ep := range nc.EndpointsConfig {
if err := backend.ConnectContainerToNetwork(cr.ID, n, ep); err != nil {
return err
}
}
}
if err := backend.UpdateContainerServiceConfig(cr.ID, c.container.serviceConfig()); err != nil {
return err
}
return nil
}
func (c *containerAdapter) start(ctx context.Context) error {
return c.backend.ContainerStart(c.container.name(), nil)
}
func (c *containerAdapter) inspect(ctx context.Context) (types.ContainerJSON, error) {
cs, err := c.backend.ContainerInspectCurrent(c.container.name(), false)
if ctx.Err() != nil {
return types.ContainerJSON{}, ctx.Err()
}
if err != nil {
return types.ContainerJSON{}, err
}
return *cs, nil
}
// events issues a call to the events API and returns a channel with all
// events. The stream of events can be shutdown by cancelling the context.
//
// A chan struct{} is returned that will be closed if the event processing
// fails and needs to be restarted.
func (c *containerAdapter) wait(ctx context.Context) error {
return c.backend.ContainerWaitWithContext(ctx, c.container.name())
}
func (c *containerAdapter) shutdown(ctx context.Context) error {
// Default stop grace period to 10s.
stopgrace := 10
spec := c.container.spec()
if spec.StopGracePeriod != nil {
stopgrace = int(spec.StopGracePeriod.Seconds)
}
return c.backend.ContainerStop(c.container.name(), stopgrace)
}
func (c *containerAdapter) terminate(ctx context.Context) error {
return c.backend.ContainerKill(c.container.name(), uint64(syscall.SIGKILL))
}
func (c *containerAdapter) remove(ctx context.Context) error {
return c.backend.ContainerRm(c.container.name(), &types.ContainerRmConfig{
RemoveVolume: true,
ForceRemove: true,
})
}
func (c *containerAdapter) createVolumes(ctx context.Context, backend executorpkg.Backend) error {
// Create plugin volumes that are embedded inside a Mount
for _, mount := range c.container.task.Spec.GetContainer().Mounts {
if mount.Type != api.MountTypeVolume {
continue
}
if mount.VolumeOptions == nil {
continue
}
if mount.VolumeOptions.DriverConfig == nil {
continue
}
req := c.container.volumeCreateRequest(&mount)
// Check if this volume exists on the engine
if _, err := backend.VolumeCreate(req.Name, req.Driver, req.DriverOpts, req.Labels); err != nil {
// TODO(amitshukla): Today, volume create through the engine api does not return an error
// when the named volume with the same parameters already exists.
// It returns an error if the driver name is different - that is a valid error
return err
}
}
return nil
}
// todo: typed/wrapped errors
func isContainerCreateNameConflict(err error) bool {
return strings.Contains(err.Error(), "Conflict. The name")
}
func isUnknownContainer(err error) bool {
return strings.Contains(err.Error(), "No such container:")
}
func isStoppedContainer(err error) bool {
return strings.Contains(err.Error(), "is already stopped")
}