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moby--moby/server.go
2013-05-20 17:30:33 -07:00

878 lines
23 KiB
Go

package docker
import (
"fmt"
"github.com/dotcloud/docker/auth"
"github.com/dotcloud/docker/registry"
"github.com/dotcloud/docker/utils"
"io"
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"path"
"runtime"
"strings"
)
func (srv *Server) DockerVersion() ApiVersion {
return ApiVersion{VERSION, GIT_COMMIT, srv.runtime.capabilities.MemoryLimit, srv.runtime.capabilities.SwapLimit}
}
func (srv *Server) ContainerKill(name string) error {
if container := srv.runtime.Get(name); container != nil {
if err := container.Kill(); err != nil {
return fmt.Errorf("Error restarting container %s: %s", name, err.Error())
}
} else {
return fmt.Errorf("No such container: %s", name)
}
return nil
}
func (srv *Server) ContainerExport(name string, out io.Writer) error {
if container := srv.runtime.Get(name); container != nil {
data, err := container.Export()
if err != nil {
return err
}
// Stream the entire contents of the container (basically a volatile snapshot)
if _, err := io.Copy(out, data); err != nil {
return err
}
return nil
}
return fmt.Errorf("No such container: %s", name)
}
func (srv *Server) ImagesSearch(term string) ([]ApiSearch, error) {
results, err := srv.registry.SearchRepositories(term)
if err != nil {
return nil, err
}
var outs []ApiSearch
for _, repo := range results.Results {
var out ApiSearch
out.Description = repo["description"]
if len(out.Description) > 45 {
out.Description = utils.Trunc(out.Description, 42) + "..."
}
out.Name = repo["name"]
outs = append(outs, out)
}
return outs, nil
}
func (srv *Server) ImageInsert(name, url, path string, out io.Writer) error {
out = utils.NewWriteFlusher(out)
img, err := srv.runtime.repositories.LookupImage(name)
if err != nil {
return err
}
file, err := utils.Download(url, out)
if err != nil {
return err
}
defer file.Body.Close()
config, _, err := ParseRun([]string{img.Id, "echo", "insert", url, path}, srv.runtime.capabilities)
if err != nil {
return err
}
b := NewBuilder(srv.runtime)
c, err := b.Create(config)
if err != nil {
return err
}
if err := c.Inject(utils.ProgressReader(file.Body, int(file.ContentLength), out, "Downloading %v/%v (%v)"), path); err != nil {
return err
}
// FIXME: Handle custom repo, tag comment, author
img, err = b.Commit(c, "", "", img.Comment, img.Author, nil)
if err != nil {
return err
}
fmt.Fprintf(out, "%s\n", img.Id)
return nil
}
func (srv *Server) ImagesViz(out io.Writer) error {
images, _ := srv.runtime.graph.All()
if images == nil {
return nil
}
out.Write([]byte("digraph docker {\n"))
var (
parentImage *Image
err error
)
for _, image := range images {
parentImage, err = image.GetParent()
if err != nil {
return fmt.Errorf("Error while getting parent image: %v", err)
}
if parentImage != nil {
out.Write([]byte(" \"" + parentImage.ShortId() + "\" -> \"" + image.ShortId() + "\"\n"))
} else {
out.Write([]byte(" base -> \"" + image.ShortId() + "\" [style=invis]\n"))
}
}
reporefs := make(map[string][]string)
for name, repository := range srv.runtime.repositories.Repositories {
for tag, id := range repository {
reporefs[utils.TruncateId(id)] = append(reporefs[utils.TruncateId(id)], fmt.Sprintf("%s:%s", name, tag))
}
}
for id, repos := range reporefs {
out.Write([]byte(" \"" + id + "\" [label=\"" + id + "\\n" + strings.Join(repos, "\\n") + "\",shape=box,fillcolor=\"paleturquoise\",style=\"filled,rounded\"];\n"))
}
out.Write([]byte(" base [style=invisible]\n}\n"))
return nil
}
func (srv *Server) Images(all bool, filter string) ([]ApiImages, error) {
var (
allImages map[string]*Image
err error
)
if all {
allImages, err = srv.runtime.graph.Map()
} else {
allImages, err = srv.runtime.graph.Heads()
}
if err != nil {
return nil, err
}
outs := []ApiImages{} //produce [] when empty instead of 'null'
for name, repository := range srv.runtime.repositories.Repositories {
if filter != "" && name != filter {
continue
}
for tag, id := range repository {
var out ApiImages
image, err := srv.runtime.graph.Get(id)
if err != nil {
log.Printf("Warning: couldn't load %s from %s/%s: %s", id, name, tag, err)
continue
}
delete(allImages, id)
out.Repository = name
out.Tag = tag
out.Id = image.Id
out.Created = image.Created.Unix()
outs = append(outs, out)
}
}
// Display images which aren't part of a
if filter == "" {
for _, image := range allImages {
var out ApiImages
out.Id = image.Id
out.Created = image.Created.Unix()
outs = append(outs, out)
}
}
return outs, nil
}
func (srv *Server) DockerInfo() ApiInfo {
images, _ := srv.runtime.graph.All()
var imgcount int
if images == nil {
imgcount = 0
} else {
imgcount = len(images)
}
var out ApiInfo
out.Containers = len(srv.runtime.List())
out.Version = VERSION
out.Images = imgcount
out.GoVersion = runtime.Version()
if os.Getenv("DEBUG") != "" {
out.Debug = true
out.NFd = utils.GetTotalUsedFds()
out.NGoroutines = runtime.NumGoroutine()
}
return out
}
func (srv *Server) ImageHistory(name string) ([]ApiHistory, error) {
image, err := srv.runtime.repositories.LookupImage(name)
if err != nil {
return nil, err
}
var outs []ApiHistory = []ApiHistory{} //produce [] when empty instead of 'null'
err = image.WalkHistory(func(img *Image) error {
var out ApiHistory
out.Id = srv.runtime.repositories.ImageName(img.ShortId())
out.Created = img.Created.Unix()
out.CreatedBy = strings.Join(img.ContainerConfig.Cmd, " ")
outs = append(outs, out)
return nil
})
return outs, nil
}
func (srv *Server) ContainerChanges(name string) ([]Change, error) {
if container := srv.runtime.Get(name); container != nil {
return container.Changes()
}
return nil, fmt.Errorf("No such container: %s", name)
}
func (srv *Server) Containers(all bool, n int, since, before string) []ApiContainers {
var foundBefore bool
var displayed int
retContainers := []ApiContainers{}
for _, container := range srv.runtime.List() {
if !container.State.Running && !all && n == -1 && since == "" && before == "" {
continue
}
if before != "" {
if container.ShortId() == before {
foundBefore = true
continue
}
if !foundBefore {
continue
}
}
if displayed == n {
break
}
if container.ShortId() == since {
break
}
displayed++
c := ApiContainers{
Id: container.Id,
}
c.Image = srv.runtime.repositories.ImageName(container.Image)
c.Command = fmt.Sprintf("%s %s", container.Path, strings.Join(container.Args, " "))
c.Created = container.Created.Unix()
c.Status = container.State.String()
c.Ports = container.NetworkSettings.PortMappingHuman()
retContainers = append(retContainers, c)
}
return retContainers
}
func (srv *Server) ContainerCommit(name, repo, tag, author, comment string, config *Config) (string, error) {
container := srv.runtime.Get(name)
if container == nil {
return "", fmt.Errorf("No such container: %s", name)
}
img, err := NewBuilder(srv.runtime).Commit(container, repo, tag, comment, author, config)
if err != nil {
return "", err
}
return img.ShortId(), err
}
func (srv *Server) ContainerTag(name, repo, tag string, force bool) error {
if err := srv.runtime.repositories.Set(repo, tag, name, force); err != nil {
return err
}
return nil
}
func (srv *Server) pullImage(out io.Writer, imgId, registry string, token []string) error {
out = utils.NewWriteFlusher(out)
history, err := srv.registry.GetRemoteHistory(imgId, registry, token)
if err != nil {
return err
}
// FIXME: Try to stream the images?
// FIXME: Launch the getRemoteImage() in goroutines
for _, id := range history {
if !srv.runtime.graph.Exists(id) {
fmt.Fprintf(out, "Pulling %s metadata\r\n", id)
imgJson, err := srv.registry.GetRemoteImageJson(id, registry, token)
if err != nil {
// FIXME: Keep goging in case of error?
return err
}
img, err := NewImgJson(imgJson)
if err != nil {
return fmt.Errorf("Failed to parse json: %s", err)
}
// Get the layer
fmt.Fprintf(out, "Pulling %s fs layer\r\n", img.Id)
layer, contentLength, err := srv.registry.GetRemoteImageLayer(img.Id, registry, token)
if err != nil {
return err
}
if err := srv.runtime.graph.Register(utils.ProgressReader(layer, contentLength, out, "Downloading %v/%v (%v)"), false, img); err != nil {
return err
}
}
}
return nil
}
func (srv *Server) pullRepository(out io.Writer, remote, askedTag string) error {
out = utils.NewWriteFlusher(out)
fmt.Fprintf(out, "Pulling repository %s from %s\r\n", remote, auth.IndexServerAddress())
repoData, err := srv.registry.GetRepositoryData(remote)
if err != nil {
return err
}
utils.Debugf("Updating checksums")
// Reload the json file to make sure not to overwrite faster sums
if err := srv.runtime.graph.UpdateChecksums(repoData.ImgList); err != nil {
return err
}
utils.Debugf("Retrieving the tag list")
tagsList, err := srv.registry.GetRemoteTags(repoData.Endpoints, remote, repoData.Tokens)
if err != nil {
return err
}
utils.Debugf("Registering tags")
// If not specific tag have been asked, take all
if askedTag == "" {
for tag, id := range tagsList {
repoData.ImgList[id].Tag = tag
}
} else {
// Otherwise, check that the tag exists and use only that one
if id, exists := tagsList[askedTag]; !exists {
return fmt.Errorf("Tag %s not found in repositoy %s", askedTag, remote)
} else {
repoData.ImgList[id].Tag = askedTag
}
}
for _, img := range repoData.ImgList {
if askedTag != "" && img.Tag != askedTag {
utils.Debugf("(%s) does not match %s (id: %s), skipping", img.Tag, askedTag, img.Id)
continue
}
fmt.Fprintf(out, "Pulling image %s (%s) from %s\n", img.Id, img.Tag, remote)
success := false
for _, ep := range repoData.Endpoints {
if err := srv.pullImage(out, img.Id, "https://"+ep+"/v1", repoData.Tokens); err != nil {
fmt.Fprintf(out, "Error while retrieving image for tag: %s (%s); checking next endpoint\n", askedTag, err)
continue
}
success = true
break
}
if !success {
return fmt.Errorf("Could not find repository on any of the indexed registries.")
}
}
for tag, id := range tagsList {
if askedTag != "" && tag != askedTag {
continue
}
if err := srv.runtime.repositories.Set(remote, tag, id, true); err != nil {
return err
}
}
if err := srv.runtime.repositories.Save(); err != nil {
return err
}
return nil
}
func (srv *Server) ImagePull(name, tag, registry string, out io.Writer) error {
if registry != "" {
if err := srv.pullImage(out, name, registry, nil); err != nil {
return err
}
return nil
}
if err := srv.pullRepository(out, name, tag); err != nil {
return err
}
return nil
}
// Retrieve the checksum of an image
// Priority:
// - Check on the stored checksums
// - Check if the archive exists, if it does not, ask the registry
// - If the archive does exists, process the checksum from it
// - If the archive does not exists and not found on registry, process checksum from layer
func (srv *Server) getChecksum(imageId string) (string, error) {
// FIXME: Use in-memory map instead of reading the file each time
if sums, err := srv.runtime.graph.getStoredChecksums(); err != nil {
return "", err
} else if checksum, exists := sums[imageId]; exists {
return checksum, nil
}
img, err := srv.runtime.graph.Get(imageId)
if err != nil {
return "", err
}
if _, err := os.Stat(layerArchivePath(srv.runtime.graph.imageRoot(imageId))); err != nil {
if os.IsNotExist(err) {
// TODO: Ask the registry for the checksum
// As the archive is not there, it is supposed to come from a pull.
} else {
return "", err
}
}
checksum, err := img.Checksum()
if err != nil {
return "", err
}
return checksum, nil
}
// Retrieve the all the images to be uploaded in the correct order
// Note: we can't use a map as it is not ordered
func (srv *Server) getImageList(localRepo map[string]string) ([]*registry.ImgData, error) {
var imgList []*registry.ImgData
imageSet := make(map[string]struct{})
for tag, id := range localRepo {
img, err := srv.runtime.graph.Get(id)
if err != nil {
return nil, err
}
img.WalkHistory(func(img *Image) error {
if _, exists := imageSet[img.Id]; exists {
return nil
}
imageSet[img.Id] = struct{}{}
checksum, err := srv.getChecksum(img.Id)
if err != nil {
return err
}
imgList = append([]*registry.ImgData{{
Id: img.Id,
Checksum: checksum,
Tag: tag,
}}, imgList...)
return nil
})
}
return imgList, nil
}
func (srv *Server) pushRepository(out io.Writer, name string, localRepo map[string]string) error {
out = utils.NewWriteFlusher(out)
fmt.Fprintf(out, "Processing checksums\n")
imgList, err := srv.getImageList(localRepo)
if err != nil {
return err
}
fmt.Fprintf(out, "Sending image list\n")
repoData, err := srv.registry.PushImageJsonIndex(name, imgList, false)
if err != nil {
return err
}
// FIXME: Send only needed images
for _, ep := range repoData.Endpoints {
fmt.Fprintf(out, "Pushing repository %s to %s (%d tags)\r\n", name, ep, len(localRepo))
// For each image within the repo, push them
for _, elem := range imgList {
if _, exists := repoData.ImgList[elem.Id]; exists {
fmt.Fprintf(out, "Image %s already on registry, skipping\n", name)
continue
}
if err := srv.pushImage(out, name, elem.Id, ep, repoData.Tokens); err != nil {
// FIXME: Continue on error?
return err
}
fmt.Fprintf(out, "Pushing tags for rev [%s] on {%s}\n", elem.Id, ep+"/users/"+name+"/"+elem.Tag)
if err := srv.registry.PushRegistryTag(name, elem.Id, elem.Tag, ep, repoData.Tokens); err != nil {
return err
}
}
}
if _, err := srv.registry.PushImageJsonIndex(name, imgList, true); err != nil {
return err
}
return nil
}
func (srv *Server) pushImage(out io.Writer, remote, imgId, ep string, token []string) error {
out = utils.NewWriteFlusher(out)
jsonRaw, err := ioutil.ReadFile(path.Join(srv.runtime.graph.Root, imgId, "json"))
if err != nil {
return fmt.Errorf("Error while retreiving the path for {%s}: %s", imgId, err)
}
fmt.Fprintf(out, "Pushing %s\r\n", imgId)
// Make sure we have the image's checksum
checksum, err := srv.getChecksum(imgId)
if err != nil {
return err
}
imgData := &registry.ImgData{
Id: imgId,
Checksum: checksum,
}
// Send the json
if err := srv.registry.PushImageJsonRegistry(imgData, jsonRaw, ep, token); err != nil {
if err == registry.ErrAlreadyExists {
fmt.Fprintf(out, "Image %s already uploaded ; skipping\n", imgData.Id)
return nil
}
return err
}
// Retrieve the tarball to be sent
var layerData *TempArchive
// If the archive exists, use it
file, err := os.Open(layerArchivePath(srv.runtime.graph.imageRoot(imgId)))
if err != nil {
if os.IsNotExist(err) {
// If the archive does not exist, create one from the layer
layerData, err = srv.runtime.graph.TempLayerArchive(imgId, Xz, out)
if err != nil {
return fmt.Errorf("Failed to generate layer archive: %s", err)
}
} else {
return err
}
} else {
defer file.Close()
st, err := file.Stat()
if err != nil {
return err
}
layerData = &TempArchive{
File: file,
Size: st.Size(),
}
}
// Send the layer
if err := srv.registry.PushImageLayerRegistry(imgData.Id, utils.ProgressReader(layerData, int(layerData.Size), out, ""), ep, token); err != nil {
return err
}
return nil
}
func (srv *Server) ImagePush(name, registry string, out io.Writer) error {
out = utils.NewWriteFlusher(out)
img, err := srv.runtime.graph.Get(name)
if err != nil {
fmt.Fprintf(out, "The push refers to a repository [%s] (len: %d)\n", name, len(srv.runtime.repositories.Repositories[name]))
// If it fails, try to get the repository
if localRepo, exists := srv.runtime.repositories.Repositories[name]; exists {
if err := srv.pushRepository(out, name, localRepo); err != nil {
return err
}
return nil
}
return err
}
fmt.Fprintf(out, "The push refers to an image: [%s]\n", name)
if err := srv.pushImage(out, name, img.Id, registry, nil); err != nil {
return err
}
return nil
}
func (srv *Server) ImageImport(src, repo, tag string, in io.Reader, out io.Writer) error {
var archive io.Reader
var resp *http.Response
if src == "-" {
archive = in
} else {
u, err := url.Parse(src)
if err != nil {
fmt.Fprintf(out, "Error: %s\n", err)
}
if u.Scheme == "" {
u.Scheme = "http"
u.Host = src
u.Path = ""
}
fmt.Fprintf(out, "Downloading from %s\n", u)
// Download with curl (pretty progress bar)
// If curl is not available, fallback to http.Get()
resp, err = utils.Download(u.String(), out)
if err != nil {
return err
}
archive = utils.ProgressReader(resp.Body, int(resp.ContentLength), out, "Importing %v/%v (%v)")
}
img, err := srv.runtime.graph.Create(archive, nil, "Imported from "+src, "", nil)
if err != nil {
return err
}
// Optionally register the image at REPO/TAG
if repo != "" {
if err := srv.runtime.repositories.Set(repo, tag, img.Id, true); err != nil {
return err
}
}
fmt.Fprintf(out, "%s\n", img.ShortId())
return nil
}
func (srv *Server) ContainerCreate(config *Config) (string, error) {
if config.Memory > 0 && !srv.runtime.capabilities.MemoryLimit {
config.Memory = 0
}
if config.Memory > 0 && !srv.runtime.capabilities.SwapLimit {
config.MemorySwap = -1
}
b := NewBuilder(srv.runtime)
container, err := b.Create(config)
if err != nil {
if srv.runtime.graph.IsNotExist(err) {
return "", fmt.Errorf("No such image: %s", config.Image)
}
return "", err
}
return container.ShortId(), nil
}
func (srv *Server) ContainerRestart(name string, t int) error {
if container := srv.runtime.Get(name); container != nil {
if err := container.Restart(t); err != nil {
return fmt.Errorf("Error restarting container %s: %s", name, err.Error())
}
} else {
return fmt.Errorf("No such container: %s", name)
}
return nil
}
func (srv *Server) ContainerDestroy(name string, removeVolume bool) error {
if container := srv.runtime.Get(name); container != nil {
volumes := make(map[string]struct{})
// Store all the deleted containers volumes
for _, volumeId := range container.Volumes {
volumes[volumeId] = struct{}{}
}
if err := srv.runtime.Destroy(container); err != nil {
return fmt.Errorf("Error destroying container %s: %s", name, err.Error())
}
if removeVolume {
// Retrieve all volumes from all remaining containers
usedVolumes := make(map[string]*Container)
for _, container := range srv.runtime.List() {
for _, containerVolumeId := range container.Volumes {
usedVolumes[containerVolumeId] = container
}
}
for volumeId := range volumes {
// If the requested volu
if c, exists := usedVolumes[volumeId]; exists {
log.Printf("The volume %s is used by the container %s. Impossible to remove it. Skipping.\n", volumeId, c.Id)
continue
}
if err := srv.runtime.volumes.Delete(volumeId); err != nil {
return err
}
}
}
} else {
return fmt.Errorf("No such container: %s", name)
}
return nil
}
func (srv *Server) ImageDelete(name string) error {
img, err := srv.runtime.repositories.LookupImage(name)
if err != nil {
return fmt.Errorf("No such image: %s", name)
} else {
if err := srv.runtime.graph.Delete(img.Id); err != nil {
return fmt.Errorf("Error deleting image %s: %s", name, err.Error())
}
}
return nil
}
func (srv *Server) ImageGetCached(imgId string, config *Config) (*Image, error) {
// Retrieve all images
images, err := srv.runtime.graph.All()
if err != nil {
return nil, err
}
// Store the tree in a map of map (map[parentId][childId])
imageMap := make(map[string]map[string]struct{})
for _, img := range images {
if _, exists := imageMap[img.Parent]; !exists {
imageMap[img.Parent] = make(map[string]struct{})
}
imageMap[img.Parent][img.Id] = struct{}{}
}
// Loop on the children of the given image and check the config
for elem := range imageMap[imgId] {
img, err := srv.runtime.graph.Get(elem)
if err != nil {
return nil, err
}
if CompareConfig(&img.ContainerConfig, config) {
return img, nil
}
}
return nil, nil
}
func (srv *Server) ContainerStart(name string) error {
if container := srv.runtime.Get(name); container != nil {
if err := container.Start(); err != nil {
return fmt.Errorf("Error starting container %s: %s", name, err.Error())
}
} else {
return fmt.Errorf("No such container: %s", name)
}
return nil
}
func (srv *Server) ContainerStop(name string, t int) error {
if container := srv.runtime.Get(name); container != nil {
if err := container.Stop(t); err != nil {
return fmt.Errorf("Error stopping container %s: %s", name, err.Error())
}
} else {
return fmt.Errorf("No such container: %s", name)
}
return nil
}
func (srv *Server) ContainerWait(name string) (int, error) {
if container := srv.runtime.Get(name); container != nil {
return container.Wait(), nil
}
return 0, fmt.Errorf("No such container: %s", name)
}
func (srv *Server) ContainerAttach(name string, logs, stream, stdin, stdout, stderr bool, in io.ReadCloser, out io.Writer) error {
container := srv.runtime.Get(name)
if container == nil {
return fmt.Errorf("No such container: %s", name)
}
//logs
if logs {
if stdout {
cLog, err := container.ReadLog("stdout")
if err != nil {
utils.Debugf(err.Error())
} else if _, err := io.Copy(out, cLog); err != nil {
utils.Debugf(err.Error())
}
}
if stderr {
cLog, err := container.ReadLog("stderr")
if err != nil {
utils.Debugf(err.Error())
} else if _, err := io.Copy(out, cLog); err != nil {
utils.Debugf(err.Error())
}
}
}
//stream
if stream {
if container.State.Ghost {
return fmt.Errorf("Impossible to attach to a ghost container")
}
var (
cStdin io.ReadCloser
cStdout, cStderr io.Writer
cStdinCloser io.Closer
)
if stdin {
r, w := io.Pipe()
go func() {
defer w.Close()
defer utils.Debugf("Closing buffered stdin pipe")
io.Copy(w, in)
}()
cStdin = r
cStdinCloser = in
}
if stdout {
cStdout = out
}
if stderr {
cStderr = out
}
<-container.Attach(cStdin, cStdinCloser, cStdout, cStderr)
// If we are in stdinonce mode, wait for the process to end
// otherwise, simply return
if container.Config.StdinOnce && !container.Config.Tty {
container.Wait()
}
}
return nil
}
func (srv *Server) ContainerInspect(name string) (*Container, error) {
if container := srv.runtime.Get(name); container != nil {
return container, nil
}
return nil, fmt.Errorf("No such container: %s", name)
}
func (srv *Server) ImageInspect(name string) (*Image, error) {
if image, err := srv.runtime.repositories.LookupImage(name); err == nil && image != nil {
return image, nil
}
return nil, fmt.Errorf("No such image: %s", name)
}
func NewServer(autoRestart bool) (*Server, error) {
if runtime.GOARCH != "amd64" {
log.Fatalf("The docker runtime currently only supports amd64 (not %s). This will change in the future. Aborting.", runtime.GOARCH)
}
runtime, err := NewRuntime(autoRestart)
if err != nil {
return nil, err
}
srv := &Server{
runtime: runtime,
registry: registry.NewRegistry(runtime.root),
}
runtime.srv = srv
return srv, nil
}
type Server struct {
runtime *Runtime
registry *registry.Registry
}