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contrib/podex: add daemon mode #4868

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merged 3 commits into from
Feb 26, 2015
Merged

contrib/podex: add daemon mode #4868

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aef560a
contrib/podex: split manifest generation
proppy Feb 26, 2015
bdaaa0f
podex: add daemon mode
proppy Feb 26, 2015
478257a
contrib/podex: add http status code handling
proppy Feb 26, 2015
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81 changes: 59 additions & 22 deletions contrib/podex/podex.go
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Original file line number Diff line number Diff line change
Expand Up @@ -45,9 +45,10 @@ import (

const usage = "podex [-format=yaml|json] [-type=pod|container] [-id NAME] IMAGES..."

var manifestFormat = flag.String("format", "yaml", "manifest format to output, `yaml` or `json`")
var manifestType = flag.String("type", "pod", "manifest type to output, `pod` or `container`")
var manifestName = flag.String("name", "", "manifest name, default to image base name")
var flManifestFormat = flag.String("format", "yaml", "manifest format to output, `yaml` or `json`")
var flManifestType = flag.String("type", "pod", "manifest type to output, `pod` or `container`")
var flManifestName = flag.String("name", "", "manifest name, default to image base name")
var flDaemon = flag.Bool("daemon", false, "daemon mode")

func init() {
flag.Usage = func() {
Expand All @@ -66,21 +67,54 @@ type image struct {
func main() {
flag.Parse()

if *flDaemon {
http.HandleFunc("/pods/", func(w http.ResponseWriter, r *http.Request) {
image := strings.TrimPrefix(r.URL.Path, "/pods/")
_, _, manifestName, _ := splitDockerImageName(image)
manifest, err := getManifest(manifestName, "pod", "json", image)
if err != nil {
errMessage := fmt.Sprintf("failed to generate pod manifest for image %q: %v", image, err)
log.Print(errMessage)
http.Error(w, errMessage, http.StatusInternalServerError)
return
}
io.Copy(w, manifest)
})
log.Fatal(http.ListenAndServe(":8080", nil))
}

if flag.NArg() < 1 {
flag.Usage()
log.Fatal("pod: missing image argument")
}
if *manifestName == "" {
if *flManifestName == "" {
if flag.NArg() > 1 {
flag.Usage()
log.Fatal("podex: -id arg is required when passing more than one image")
}
_, _, *manifestName, _ = splitDockerImageName(flag.Arg(0))
_, _, *flManifestName, _ = splitDockerImageName(flag.Arg(0))
}
if *flManifestType != "pod" && *flManifestType != "container" {
flag.Usage()
log.Fatalf("unsupported manifest type %q", *flManifestType)
}
if *flManifestFormat != "yaml" && *flManifestFormat != "json" {
flag.Usage()
log.Fatalf("unsupported manifest format %q", *flManifestFormat)
}

manifest, err := getManifest(*flManifestName, *flManifestType, *flManifestFormat, flag.Args()...)
if err != nil {
log.Fatalf("failed to generate %q manifest for %v: %v", *flManifestType, flag.Args(), err)
}
io.Copy(os.Stdout, manifest)
}

// getManifest infers a pod (or container) manifest for a list of docker images.
func getManifest(manifestName, manifestType, manifestFormat string, images ...string) (io.Reader, error) {
podContainers := []goyaml.MapSlice{}

for _, imageName := range flag.Args() {
for _, imageName := range images {
host, namespace, repo, tag := splitDockerImageName(imageName)

container := goyaml.MapSlice{
Expand All @@ -91,13 +125,13 @@ func main() {
img, err := getImageMetadata(host, namespace, repo, tag)

if err != nil {
log.Fatalf("failed to get image metadata %q: %v", imageName, err)
return nil, fmt.Errorf("failed to get image metadata %q: %v", imageName, err)
}
portSlice := []goyaml.MapSlice{}
for p := range img.ContainerConfig.ExposedPorts {
port, err := strconv.Atoi(p.Port())
if err != nil {
log.Fatalf("failed to parse port %q: %v", p.Port(), err)
return nil, fmt.Errorf("failed to parse port %q: %v", p.Port(), err)
}
portEntry := goyaml.MapSlice{{
Key: "name",
Expand Down Expand Up @@ -125,48 +159,47 @@ func main() {

var data interface{}

switch *manifestType {
switch manifestType {
case "container":
containerManifest = append(goyaml.MapSlice{
{Key: "id", Value: *manifestName},
{Key: "id", Value: manifestName},
}, containerManifest...)
data = containerManifest
case "pod":
data = goyaml.MapSlice{
{Key: "id", Value: *manifestName},
{Key: "id", Value: manifestName},
{Key: "kind", Value: "Pod"},
{Key: "apiVersion", Value: "v1beta1"},
{Key: "desiredState", Value: goyaml.MapSlice{
{Key: "manifest", Value: containerManifest},
}},
}
default:
flag.Usage()
log.Fatalf("unsupported manifest type %q", *manifestType)
return nil, fmt.Errorf("unsupported manifest type %q", manifestFormat)
}

yamlBytes, err := goyaml.Marshal(data)
if err != nil {
log.Fatalf("failed to marshal container manifest: %v", err)
return nil, fmt.Errorf("failed to marshal container manifest: %v", err)
}

switch *manifestFormat {
switch manifestFormat {
case "yaml":
os.Stdout.Write(yamlBytes)
return bytes.NewBuffer(yamlBytes), nil
case "json":
jsonBytes, err := yaml.YAMLToJSON(yamlBytes)
if err != nil {
log.Fatalf("failed to marshal container manifest into JSON: %v", err)
return nil, fmt.Errorf("failed to marshal container manifest into JSON: %v", err)
}
var jsonPretty bytes.Buffer
if err := json.Indent(&jsonPretty, jsonBytes, "", " "); err != nil {
log.Fatalf("failed to indent json %q: %v", string(jsonBytes), err)
return nil, fmt.Errorf("failed to indent json %q: %v", string(jsonBytes), err)
}
io.Copy(os.Stdout, &jsonPretty)
return &jsonPretty, nil
default:
flag.Usage()
log.Fatalf("unsupported manifest format %q", *manifestFormat)
return nil, fmt.Errorf("unsupported manifest format %q", manifestFormat)
}

}

// splitDockerImageName split a docker image name of the form [HOST/][NAMESPACE/]REPOSITORY[:TAG]
Expand Down Expand Up @@ -229,8 +262,12 @@ func getImageMetadata(host, namespace, repo, tag string) (*imageMetadata, error)
req.Header.Add("X-Docker-Token", "true")
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, fmt.Errorf("error getting X-Docker-Token from index.docker.io: %v", err)
return nil, fmt.Errorf("error making request to %q: %v", host, err)
}
if resp.StatusCode != 200 {
return nil, fmt.Errorf("error getting X-Docker-Token from %s: %q", host, resp.Status)
}

endpoints := resp.Header.Get("X-Docker-Endpoints")
token := resp.Header.Get("X-Docker-Token")
req, err = http.NewRequest("GET", fmt.Sprintf("https://%s/v1/repositories/%s/%s/tags/%s", endpoints, namespace, repo, tag), nil)
Expand Down