DockerCLI/cli/command/stack/kubernetes/list.go

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package kubernetes
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"github.com/docker/cli/cli/command"
"github.com/docker/cli/cli/command/stack/formatter"
"github.com/docker/cli/cli/command/stack/options"
"github.com/docker/cli/cli/config/configfile"
"github.com/pkg/errors"
core_v1 "k8s.io/api/core/v1"
apierrs "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// GetStacks lists the kubernetes stacks
func GetStacks(kubeCli *KubeCli, opts options.List) ([]*formatter.Stack, error) {
if opts.AllNamespaces || len(opts.Namespaces) == 0 {
if isAllNamespacesDisabled(kubeCli.ConfigFile().Kubernetes) {
opts.AllNamespaces = true
}
return getStacksWithAllNamespaces(kubeCli, opts)
}
return getStacksWithNamespaces(kubeCli, opts, removeDuplicates(opts.Namespaces))
}
func isAllNamespacesDisabled(kubeCliConfig *configfile.KubernetesConfig) bool {
return kubeCliConfig == nil || kubeCliConfig != nil && kubeCliConfig.AllNamespaces != "disabled"
}
func getStacks(kubeCli *KubeCli, opts options.List) ([]*formatter.Stack, error) {
composeClient, err := kubeCli.composeClient()
if err != nil {
return nil, err
}
stackSvc, err := composeClient.Stacks(opts.AllNamespaces)
if err != nil {
return nil, err
}
stacks, err := stackSvc.List(metav1.ListOptions{})
if err != nil {
return nil, err
}
var formattedStacks []*formatter.Stack
for _, stack := range stacks {
formattedStacks = append(formattedStacks, &formatter.Stack{
Name: stack.Name,
Services: len(stack.getServices()),
Orchestrator: "Kubernetes",
Namespace: stack.Namespace,
})
}
return formattedStacks, nil
}
func getStacksWithAllNamespaces(kubeCli *KubeCli, opts options.List) ([]*formatter.Stack, error) {
stacks, err := getStacks(kubeCli, opts)
if !apierrs.IsForbidden(err) {
return stacks, err
}
namespaces, err2 := getUserVisibleNamespaces(*kubeCli)
if err2 != nil {
return nil, errors.Wrap(err2, "failed to query user visible namespaces")
}
if namespaces == nil {
// UCP API not present, fall back to Kubernetes error
return nil, err
}
opts.AllNamespaces = false
return getStacksWithNamespaces(kubeCli, opts, namespaces)
}
func getUserVisibleNamespaces(dockerCli command.Cli) ([]string, error) {
host := dockerCli.Client().DaemonHost()
endpoint, err := url.Parse(host)
if err != nil {
return nil, err
}
endpoint.Scheme = "https"
endpoint.Path = "/kubernetesNamespaces"
resp, err := dockerCli.Client().HTTPClient().Get(endpoint.String())
if err != nil {
return nil, err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, errors.Wrapf(err, "received %d status and unable to read response", resp.StatusCode)
}
switch resp.StatusCode {
case http.StatusOK:
nms := &core_v1.NamespaceList{}
if err := json.Unmarshal(body, nms); err != nil {
return nil, errors.Wrapf(err, "unmarshal failed: %s", string(body))
}
namespaces := make([]string, len(nms.Items))
for i, namespace := range nms.Items {
namespaces[i] = namespace.Name
}
return namespaces, nil
case http.StatusNotFound:
// UCP API not present
return nil, nil
default:
return nil, fmt.Errorf("received %d status while retrieving namespaces: %s", resp.StatusCode, string(body))
}
}
func getStacksWithNamespaces(kubeCli *KubeCli, opts options.List, namespaces []string) ([]*formatter.Stack, error) {
stacks := []*formatter.Stack{}
for _, namespace := range namespaces {
kubeCli.kubeNamespace = namespace
ss, err := getStacks(kubeCli, opts)
if err != nil {
return nil, err
}
stacks = append(stacks, ss...)
}
return stacks, nil
}
func removeDuplicates(namespaces []string) []string {
found := make(map[string]bool)
results := namespaces[:0]
for _, n := range namespaces {
if !found[n] {
results = append(results, n)
found[n] = true
}
}
return results
}