mirror of https://github.com/k3s-io/k3s
kubectl env resolve: copy core fieldpath and resource dependencies into kubectl
Sean Sullivan
parent
d4c4871852
commit
50c5b379b7
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@ -10,12 +10,13 @@ go_library(
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importpath = "k8s.io/kubernetes/pkg/kubectl/cmd/set/env",
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visibility = ["//visibility:public"],
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deps = [
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"//pkg/api/v1/resource:go_default_library",
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"//pkg/fieldpath:go_default_library",
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"//staging/src/k8s.io/api/core/v1:go_default_library",
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"//staging/src/k8s.io/apimachinery/pkg/api/meta:go_default_library",
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"//staging/src/k8s.io/apimachinery/pkg/api/resource:go_default_library",
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"//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
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"//staging/src/k8s.io/apimachinery/pkg/runtime:go_default_library",
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"//staging/src/k8s.io/apimachinery/pkg/util/sets:go_default_library",
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"//staging/src/k8s.io/apimachinery/pkg/util/validation:go_default_library",
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"//staging/src/k8s.io/client-go/kubernetes:go_default_library",
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],
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)
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@ -18,31 +18,36 @@ package env
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import (
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"fmt"
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"math"
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"strconv"
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"strings"
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"k8s.io/api/core/v1"
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corev1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/api/resource"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/apimachinery/pkg/util/validation"
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"k8s.io/client-go/kubernetes"
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"k8s.io/kubernetes/pkg/api/v1/resource"
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"k8s.io/kubernetes/pkg/fieldpath"
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)
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// ResourceStore defines a new resource store data structure.
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type ResourceStore struct {
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SecretStore map[string]*v1.Secret
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ConfigMapStore map[string]*v1.ConfigMap
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SecretStore map[string]*corev1.Secret
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ConfigMapStore map[string]*corev1.ConfigMap
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}
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// NewResourceStore returns a pointer to a new resource store data structure.
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func NewResourceStore() *ResourceStore {
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return &ResourceStore{
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SecretStore: make(map[string]*v1.Secret),
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ConfigMapStore: make(map[string]*v1.ConfigMap),
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SecretStore: make(map[string]*corev1.Secret),
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ConfigMapStore: make(map[string]*corev1.ConfigMap),
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}
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}
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// getSecretRefValue returns the value of a secret in the supplied namespace
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func getSecretRefValue(client kubernetes.Interface, namespace string, store *ResourceStore, secretSelector *v1.SecretKeySelector) (string, error) {
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func getSecretRefValue(client kubernetes.Interface, namespace string, store *ResourceStore, secretSelector *corev1.SecretKeySelector) (string, error) {
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secret, ok := store.SecretStore[secretSelector.Name]
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if !ok {
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var err error
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@ -60,7 +65,7 @@ func getSecretRefValue(client kubernetes.Interface, namespace string, store *Res
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}
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// getConfigMapRefValue returns the value of a configmap in the supplied namespace
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func getConfigMapRefValue(client kubernetes.Interface, namespace string, store *ResourceStore, configMapSelector *v1.ConfigMapKeySelector) (string, error) {
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func getConfigMapRefValue(client kubernetes.Interface, namespace string, store *ResourceStore, configMapSelector *corev1.ConfigMapKeySelector) (string, error) {
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configMap, ok := store.ConfigMapStore[configMapSelector.Name]
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if !ok {
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var err error
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@ -77,17 +82,149 @@ func getConfigMapRefValue(client kubernetes.Interface, namespace string, store *
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}
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// getFieldRef returns the value of the supplied path in the given object
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func getFieldRef(obj runtime.Object, from *v1.EnvVarSource) (string, error) {
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return fieldpath.ExtractFieldPathAsString(obj, from.FieldRef.FieldPath)
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func getFieldRef(obj runtime.Object, from *corev1.EnvVarSource) (string, error) {
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return extractFieldPathAsString(obj, from.FieldRef.FieldPath)
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}
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// extractFieldPathAsString extracts the field from the given object
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// and returns it as a string. The object must be a pointer to an
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// API type.
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func extractFieldPathAsString(obj interface{}, fieldPath string) (string, error) {
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accessor, err := meta.Accessor(obj)
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if err != nil {
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return "", nil
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}
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if path, subscript, ok := splitMaybeSubscriptedPath(fieldPath); ok {
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switch path {
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case "metadata.annotations":
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if errs := validation.IsQualifiedName(strings.ToLower(subscript)); len(errs) != 0 {
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return "", fmt.Errorf("invalid key subscript in %s: %s", fieldPath, strings.Join(errs, ";"))
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}
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return accessor.GetAnnotations()[subscript], nil
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case "metadata.labels":
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if errs := validation.IsQualifiedName(subscript); len(errs) != 0 {
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return "", fmt.Errorf("invalid key subscript in %s: %s", fieldPath, strings.Join(errs, ";"))
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}
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return accessor.GetLabels()[subscript], nil
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default:
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return "", fmt.Errorf("fieldPath %q does not support subscript", fieldPath)
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}
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}
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switch fieldPath {
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case "metadata.annotations":
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return formatMap(accessor.GetAnnotations()), nil
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case "metadata.labels":
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return formatMap(accessor.GetLabels()), nil
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case "metadata.name":
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return accessor.GetName(), nil
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case "metadata.namespace":
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return accessor.GetNamespace(), nil
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case "metadata.uid":
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return string(accessor.GetUID()), nil
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}
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return "", fmt.Errorf("unsupported fieldPath: %v", fieldPath)
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}
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// splitMaybeSubscriptedPath checks whether the specified fieldPath is
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// subscripted, and
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// - if yes, this function splits the fieldPath into path and subscript, and
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// returns (path, subscript, true).
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// - if no, this function returns (fieldPath, "", false).
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//
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// Example inputs and outputs:
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// - "metadata.annotations['myKey']" --> ("metadata.annotations", "myKey", true)
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// - "metadata.annotations['a[b]c']" --> ("metadata.annotations", "a[b]c", true)
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// - "metadata.labels['']" --> ("metadata.labels", "", true)
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// - "metadata.labels" --> ("metadata.labels", "", false)
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func splitMaybeSubscriptedPath(fieldPath string) (string, string, bool) {
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if !strings.HasSuffix(fieldPath, "']") {
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return fieldPath, "", false
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}
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s := strings.TrimSuffix(fieldPath, "']")
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parts := strings.SplitN(s, "['", 2)
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if len(parts) < 2 {
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return fieldPath, "", false
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}
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if len(parts[0]) == 0 {
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return fieldPath, "", false
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}
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return parts[0], parts[1], true
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}
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// formatMap formats map[string]string to a string.
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func formatMap(m map[string]string) (fmtStr string) {
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// output with keys in sorted order to provide stable output
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keys := sets.NewString()
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for key := range m {
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keys.Insert(key)
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}
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for _, key := range keys.List() {
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fmtStr += fmt.Sprintf("%v=%q\n", key, m[key])
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}
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fmtStr = strings.TrimSuffix(fmtStr, "\n")
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return
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}
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// getResourceFieldRef returns the value of a resource in the given container
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func getResourceFieldRef(from *v1.EnvVarSource, c *v1.Container) (string, error) {
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return resource.ExtractContainerResourceValue(from.ResourceFieldRef, c)
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func getResourceFieldRef(from *corev1.EnvVarSource, container *corev1.Container) (string, error) {
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return extractContainerResourceValue(from.ResourceFieldRef, container)
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}
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// ExtractContainerResourceValue extracts the value of a resource
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// in an already known container
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func extractContainerResourceValue(fs *corev1.ResourceFieldSelector, container *corev1.Container) (string, error) {
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divisor := resource.Quantity{}
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if divisor.Cmp(fs.Divisor) == 0 {
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divisor = resource.MustParse("1")
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} else {
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divisor = fs.Divisor
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}
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switch fs.Resource {
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case "limits.cpu":
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return convertResourceCPUToString(container.Resources.Limits.Cpu(), divisor)
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case "limits.memory":
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return convertResourceMemoryToString(container.Resources.Limits.Memory(), divisor)
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case "limits.ephemeral-storage":
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return convertResourceEphemeralStorageToString(container.Resources.Limits.StorageEphemeral(), divisor)
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case "requests.cpu":
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return convertResourceCPUToString(container.Resources.Requests.Cpu(), divisor)
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case "requests.memory":
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return convertResourceMemoryToString(container.Resources.Requests.Memory(), divisor)
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case "requests.ephemeral-storage":
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return convertResourceEphemeralStorageToString(container.Resources.Requests.StorageEphemeral(), divisor)
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}
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return "", fmt.Errorf("Unsupported container resource : %v", fs.Resource)
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}
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// convertResourceCPUToString converts cpu value to the format of divisor and returns
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// ceiling of the value.
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func convertResourceCPUToString(cpu *resource.Quantity, divisor resource.Quantity) (string, error) {
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c := int64(math.Ceil(float64(cpu.MilliValue()) / float64(divisor.MilliValue())))
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return strconv.FormatInt(c, 10), nil
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}
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// convertResourceMemoryToString converts memory value to the format of divisor and returns
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// ceiling of the value.
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func convertResourceMemoryToString(memory *resource.Quantity, divisor resource.Quantity) (string, error) {
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m := int64(math.Ceil(float64(memory.Value()) / float64(divisor.Value())))
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return strconv.FormatInt(m, 10), nil
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}
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// convertResourceEphemeralStorageToString converts ephemeral storage value to the format of divisor and returns
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// ceiling of the value.
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func convertResourceEphemeralStorageToString(ephemeralStorage *resource.Quantity, divisor resource.Quantity) (string, error) {
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m := int64(math.Ceil(float64(ephemeralStorage.Value()) / float64(divisor.Value())))
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return strconv.FormatInt(m, 10), nil
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}
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// GetEnvVarRefValue returns the value referenced by the supplied EnvVarSource given the other supplied information.
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func GetEnvVarRefValue(kc kubernetes.Interface, ns string, store *ResourceStore, from *v1.EnvVarSource, obj runtime.Object, c *v1.Container) (string, error) {
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func GetEnvVarRefValue(kc kubernetes.Interface, ns string, store *ResourceStore, from *corev1.EnvVarSource, obj runtime.Object, c *corev1.Container) (string, error) {
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if from.SecretKeyRef != nil {
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return getSecretRefValue(kc, ns, store, from.SecretKeyRef)
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}
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@ -108,7 +245,7 @@ func GetEnvVarRefValue(kc kubernetes.Interface, ns string, store *ResourceStore,
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}
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// GetEnvVarRefString returns a text description of whichever field is set within the supplied EnvVarSource argument.
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func GetEnvVarRefString(from *v1.EnvVarSource) string {
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func GetEnvVarRefString(from *corev1.EnvVarSource) string {
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if from.ConfigMapKeyRef != nil {
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return fmt.Sprintf("configmap %s, key %s", from.ConfigMapKeyRef.Name, from.ConfigMapKeyRef.Key)
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}
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