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

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package kubernetes
import (
"fmt"
"strings"
"github.com/docker/cli/cli/command/service"
"github.com/docker/cli/cli/command/stack/formatter"
"github.com/docker/cli/cli/command/stack/options"
"github.com/docker/cli/kubernetes/labels"
"github.com/docker/docker/api/types/filters"
"github.com/docker/docker/api/types/swarm"
appsv1beta2 "k8s.io/api/apps/v1beta2"
corev1 "k8s.io/api/core/v1"
apierrs "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
var supportedServicesFilters = map[string]bool{
"mode": true,
"name": true,
"label": true,
}
func generateSelector(labels map[string][]string) []string {
var result []string
for k, v := range labels {
for _, val := range v {
result = append(result, fmt.Sprintf("%s=%s", k, val))
}
if len(v) == 0 {
result = append(result, k)
}
}
return result
}
func parseLabelFilters(rawFilters []string) map[string][]string {
labels := map[string][]string{}
for _, rawLabel := range rawFilters {
v := strings.SplitN(rawLabel, "=", 2)
key := v[0]
if len(v) > 1 {
labels[key] = append(labels[key], v[1])
} else if _, ok := labels[key]; !ok {
labels[key] = []string{}
}
}
return labels
}
func generateLabelSelector(f filters.Args, stackName string) string {
selectors := append(generateSelector(parseLabelFilters(f.Get("label"))), labels.SelectorForStack(stackName))
return strings.Join(selectors, ",")
}
func getResourcesForServiceList(dockerCli *KubeCli, filters filters.Args, labelSelector string) (*appsv1beta2.ReplicaSetList, *appsv1beta2.DaemonSetList, *corev1.ServiceList, error) {
client, err := dockerCli.composeClient()
if err != nil {
return nil, nil, nil, err
}
modes := filters.Get("mode")
replicas := &appsv1beta2.ReplicaSetList{}
if len(modes) == 0 || filters.ExactMatch("mode", "replicated") {
if replicas, err = client.ReplicaSets().List(metav1.ListOptions{LabelSelector: labelSelector}); err != nil {
return nil, nil, nil, err
}
}
daemons := &appsv1beta2.DaemonSetList{}
if len(modes) == 0 || filters.ExactMatch("mode", "global") {
if daemons, err = client.DaemonSets().List(metav1.ListOptions{LabelSelector: labelSelector}); err != nil {
return nil, nil, nil, err
}
}
services, err := client.Services().List(metav1.ListOptions{LabelSelector: labelSelector})
if err != nil {
return nil, nil, nil, err
}
return replicas, daemons, services, nil
}
// RunServices is the kubernetes implementation of docker stack services
func RunServices(dockerCli *KubeCli, opts options.Services) error {
filters := opts.Filter.Value()
if err := filters.Validate(supportedServicesFilters); err != nil {
return err
}
client, err := dockerCli.composeClient()
if err != nil {
return nil
}
stacks, err := client.Stacks(false)
if err != nil {
return nil
}
stackName := opts.Namespace
_, err = stacks.Get(stackName)
if apierrs.IsNotFound(err) {
return fmt.Errorf("nothing found in stack: %s", stackName)
}
if err != nil {
return err
}
labelSelector := generateLabelSelector(filters, stackName)
replicasList, daemonsList, servicesList, err := getResourcesForServiceList(dockerCli, filters, labelSelector)
if err != nil {
return err
}
// Convert Replicas sets and kubernetes services to swarm services and formatter information
services, info, err := convertToServices(replicasList, daemonsList, servicesList)
if err != nil {
return err
}
services = filterServicesByName(services, filters.Get("name"), stackName)
if opts.Quiet {
info = map[string]service.ListInfo{}
}
format := opts.Format
if len(format) == 0 {
if len(dockerCli.ConfigFile().ServicesFormat) > 0 && !opts.Quiet {
format = dockerCli.ConfigFile().ServicesFormat
} else {
format = formatter.TableFormatKey
}
}
servicesCtx := formatter.Context{
Output: dockerCli.Out(),
Format: service.NewListFormat(format, opts.Quiet),
}
return service.ListFormatWrite(servicesCtx, services, info)
}
func filterServicesByName(services []swarm.Service, names []string, stackName string) []swarm.Service {
if len(names) == 0 {
return services
}
prefix := stackName + "_"
// Accepts unprefixed service name (for compatibility with existing swarm scripts where service names are prefixed by stack names)
for i, n := range names {
if !strings.HasPrefix(n, prefix) {
names[i] = stackName + "_" + n
}
}
// Filter services
result := []swarm.Service{}
for _, s := range services {
for _, n := range names {
if strings.HasPrefix(s.Spec.Name, n) {
result = append(result, s)
}
}
}
return result
}