/
resource.go
229 lines (197 loc) · 5.71 KB
/
resource.go
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package k8s
import (
"errors"
"fmt"
"net/url"
"path"
"reflect"
"strconv"
"strings"
"time"
metav1 "github.com/ericchiang/k8s/apis/meta/v1"
)
// Option represents optional call parameters, such as label selectors.
type Option interface {
updateURL(base string, v url.Values) string
}
type queryParam struct {
paramName string
paramValue string
}
func (o queryParam) updateURL(base string, v url.Values) string {
v.Set(o.paramName, o.paramValue)
return base
}
// QueryParam can be used to manually set a URL query parameter by name.
func QueryParam(name, value string) Option {
return queryParam{
paramName: name,
paramValue: value,
}
}
// ResourceVersion causes watch operations to only show changes since
// a particular version of a resource.
func ResourceVersion(resourceVersion string) Option {
return queryParam{"resourceVersion", resourceVersion}
}
// Timeout declares the timeout for list and watch operations. Timeout
// is only accurate to the second.
func Timeout(d time.Duration) Option {
return queryParam{
"timeoutSeconds",
strconv.FormatInt(int64(d/time.Second), 10),
}
}
// Subresource is a way to interact with a part of an API object without needing
// permissions on the entire resource. For example, a node isn't able to modify
// a pod object, but can update the "pods/status" subresource.
//
// Common subresources are "status" and "scale".
//
// See https://kubernetes.io/docs/reference/api-concepts/
func Subresource(name string) Option {
return subresource{name}
}
type subresource struct {
name string
}
func (s subresource) updateURL(base string, v url.Values) string {
return base + "/" + s.name
}
type resourceType struct {
apiGroup string
apiVersion string
name string
namespaced bool
}
var (
resources = map[reflect.Type]resourceType{}
resourceLists = map[reflect.Type]resourceType{}
)
// Resource is a Kubernetes resource, such as a Node or Pod.
type Resource interface {
GetMetadata() *metav1.ObjectMeta
}
// Resource is list of common Kubernetes resources, such as a NodeList or
// PodList.
type ResourceList interface {
GetMetadata() *metav1.ListMeta
}
func Register(apiGroup, apiVersion, name string, namespaced bool, r Resource) {
rt := reflect.TypeOf(r)
if _, ok := resources[rt]; ok {
panic(fmt.Sprintf("resource registered twice %T", r))
}
resources[rt] = resourceType{apiGroup, apiVersion, name, namespaced}
}
func RegisterList(apiGroup, apiVersion, name string, namespaced bool, l ResourceList) {
rt := reflect.TypeOf(l)
if _, ok := resources[rt]; ok {
panic(fmt.Sprintf("resource registered twice %T", l))
}
resourceLists[rt] = resourceType{apiGroup, apiVersion, name, namespaced}
}
func urlFor(endpoint, apiGroup, apiVersion, namespace, resource, name string, options ...Option) string {
basePath := "apis/"
if apiGroup == "" {
basePath = "api/"
}
var p string
if namespace != "" {
p = path.Join(basePath, apiGroup, apiVersion, "namespaces", namespace, resource, name)
} else {
p = path.Join(basePath, apiGroup, apiVersion, resource, name)
}
e := ""
if strings.HasSuffix(endpoint, "/") {
e = endpoint + p
} else {
e = endpoint + "/" + p
}
if len(options) == 0 {
return e
}
v := url.Values{}
for _, option := range options {
e = option.updateURL(e, v)
}
if len(v) == 0 {
return e
}
return e + "?" + v.Encode()
}
func urlForPath(endpoint, path string) string {
if strings.HasPrefix(path, "/") {
path = path[1:]
}
if strings.HasSuffix(endpoint, "/") {
return endpoint + path
}
return endpoint + "/" + path
}
func resourceURL(endpoint string, r Resource, withName bool, options ...Option) (string, error) {
t, ok := resources[reflect.TypeOf(r)]
if !ok {
return "", fmt.Errorf("unregistered type %T", r)
}
meta := r.GetMetadata()
if meta == nil {
return "", errors.New("resource has no object meta")
}
switch {
case t.namespaced && (meta.Namespace == nil || *meta.Namespace == ""):
return "", errors.New("no resource namespace provided")
case !t.namespaced && (meta.Namespace != nil && *meta.Namespace != ""):
return "", errors.New("resource not namespaced")
case withName && (meta.Name == nil || *meta.Name == ""):
return "", errors.New("no resource name provided")
}
name := ""
if withName {
name = *meta.Name
}
namespace := ""
if t.namespaced {
namespace = *meta.Namespace
}
return urlFor(endpoint, t.apiGroup, t.apiVersion, namespace, t.name, name, options...), nil
}
func resourceGetURL(endpoint, namespace, name string, r Resource, options ...Option) (string, error) {
t, ok := resources[reflect.TypeOf(r)]
if !ok {
return "", fmt.Errorf("unregistered type %T", r)
}
if !t.namespaced && namespace != "" {
return "", fmt.Errorf("type not namespaced")
}
if t.namespaced && namespace == "" {
return "", fmt.Errorf("no namespace provided")
}
return urlFor(endpoint, t.apiGroup, t.apiVersion, namespace, t.name, name, options...), nil
}
func resourceListURL(endpoint, namespace string, r ResourceList, options ...Option) (string, error) {
t, ok := resourceLists[reflect.TypeOf(r)]
if !ok {
return "", fmt.Errorf("unregistered type %T", r)
}
if !t.namespaced && namespace != "" {
return "", fmt.Errorf("type not namespaced")
}
return urlFor(endpoint, t.apiGroup, t.apiVersion, namespace, t.name, "", options...), nil
}
func resourceWatchURL(endpoint, namespace string, r Resource, options ...Option) (string, error) {
t, ok := resources[reflect.TypeOf(r)]
if !ok {
return "", fmt.Errorf("unregistered type %T", r)
}
if !t.namespaced && namespace != "" {
return "", fmt.Errorf("type not namespaced")
}
url := urlFor(endpoint, t.apiGroup, t.apiVersion, namespace, t.name, "", options...)
if strings.Contains(url, "?") {
url = url + "&watch=true"
} else {
url = url + "?watch=true"
}
return url, nil
}