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sharedclientfactory.go
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/
sharedclientfactory.go
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package client
import (
"context"
"fmt"
"sync"
"time"
"github.com/rancher/lasso/pkg/mapper"
"github.com/rancher/lasso/pkg/scheme"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/client-go/discovery"
"k8s.io/client-go/rest"
)
type SharedClientFactoryOptions struct {
Mapper meta.RESTMapper
Scheme *runtime.Scheme
}
type SharedClientFactory interface {
ForKind(gvk schema.GroupVersionKind) (*Client, error)
ForResource(gvr schema.GroupVersionResource, namespaced bool) (*Client, error)
ForResourceKind(gvr schema.GroupVersionResource, kind string, namespaced bool) *Client
NewObjects(gvk schema.GroupVersionKind) (runtime.Object, runtime.Object, error)
GVKForObject(obj runtime.Object) (schema.GroupVersionKind, error)
GVKForResource(gvr schema.GroupVersionResource) (schema.GroupVersionKind, error)
IsNamespaced(gvk schema.GroupVersionKind) (bool, error)
ResourceForGVK(gvk schema.GroupVersionKind) (schema.GroupVersionResource, bool, error)
IsHealthy(ctx context.Context) bool
}
type sharedClientFactory struct {
createLock sync.RWMutex
discovery discovery.DiscoveryInterface
clients map[schema.GroupVersionResource]*Client
timeout time.Duration
rest rest.Interface
Mapper meta.RESTMapper
Scheme *runtime.Scheme
}
func NewSharedClientFactoryForConfig(config *rest.Config) (SharedClientFactory, error) {
return NewSharedClientFactory(config, nil)
}
func NewSharedClientFactory(config *rest.Config, opts *SharedClientFactoryOptions) (_ SharedClientFactory, err error) {
opts, err = applyDefaults(config, opts)
if err != nil {
return nil, err
}
config, timeout := populateConfig(opts.Scheme, config)
rest, err := rest.UnversionedRESTClientFor(config)
if err != nil {
return nil, err
}
discovery, err := discovery.NewDiscoveryClientForConfig(config)
if err != nil {
return nil, err
}
return &sharedClientFactory{
timeout: timeout,
clients: map[schema.GroupVersionResource]*Client{},
Scheme: opts.Scheme,
Mapper: opts.Mapper,
rest: rest,
discovery: discovery,
}, nil
}
func applyDefaults(config *rest.Config, opts *SharedClientFactoryOptions) (*SharedClientFactoryOptions, error) {
var newOpts SharedClientFactoryOptions
if opts != nil {
newOpts = *opts
}
if newOpts.Scheme == nil {
newOpts.Scheme = scheme.All
}
if newOpts.Mapper == nil {
mapperOpt, err := mapper.New(config)
if err != nil {
return nil, err
}
newOpts.Mapper = mapperOpt
}
return &newOpts, nil
}
func (s *sharedClientFactory) GVKForResource(gvr schema.GroupVersionResource) (schema.GroupVersionKind, error) {
return s.Mapper.KindFor(gvr)
}
func (s *sharedClientFactory) IsHealthy(ctx context.Context) bool {
_, err := s.rest.Get().AbsPath("/version").Do(ctx).Raw()
return err == nil
}
func (s *sharedClientFactory) IsNamespaced(gvk schema.GroupVersionKind) (bool, error) {
mapping, err := s.Mapper.RESTMapping(gvk.GroupKind(), gvk.Version)
if err != nil {
return false, err
}
return IsNamespaced(mapping.Resource, s.Mapper)
}
func (s *sharedClientFactory) ResourceForGVK(gvk schema.GroupVersionKind) (schema.GroupVersionResource, bool, error) {
mapping, err := s.Mapper.RESTMapping(gvk.GroupKind(), gvk.Version)
if err != nil {
return schema.GroupVersionResource{}, false, err
}
nsed, err := IsNamespaced(mapping.Resource, s.Mapper)
if err != nil {
return schema.GroupVersionResource{}, false, err
}
return mapping.Resource, nsed, nil
}
func (s *sharedClientFactory) GVKForObject(obj runtime.Object) (schema.GroupVersionKind, error) {
gvks, _, err := s.Scheme.ObjectKinds(obj)
if err != nil {
return schema.GroupVersionKind{}, err
}
if len(gvks) == 0 {
return schema.GroupVersionKind{}, fmt.Errorf("failed to find schema.GroupVersionKind for %T", obj)
}
return gvks[0], nil
}
func (s *sharedClientFactory) NewObjects(gvk schema.GroupVersionKind) (runtime.Object, runtime.Object, error) {
obj, err := s.Scheme.New(gvk)
if runtime.IsNotRegisteredError(err) {
return &unstructured.Unstructured{}, &unstructured.UnstructuredList{}, nil
} else if err != nil {
return nil, nil, err
}
objList, err := s.Scheme.New(schema.GroupVersionKind{
Group: gvk.Group,
Version: gvk.Version,
Kind: gvk.Kind + "List",
})
return obj, objList, err
}
func (s *sharedClientFactory) ForKind(gvk schema.GroupVersionKind) (*Client, error) {
gvr, nsed, err := s.ResourceForGVK(gvk)
if err != nil {
return nil, err
}
return s.ForResourceKind(gvr, gvk.Kind, nsed), nil
}
func (s *sharedClientFactory) ForResource(gvr schema.GroupVersionResource, namespaced bool) (*Client, error) {
gvk, err := s.GVKForResource(gvr)
if err != nil {
return nil, err
}
return s.ForResourceKind(gvr, gvk.Kind, namespaced), nil
}
func (s *sharedClientFactory) ForResourceKind(gvr schema.GroupVersionResource, kind string, namespaced bool) *Client {
client := s.getClient(gvr)
if client != nil {
return client
}
s.createLock.Lock()
defer s.createLock.Unlock()
client = s.clients[gvr]
if client != nil {
return client
}
client = NewClient(gvr, kind, namespaced, s.rest, s.timeout)
s.clients[gvr] = client
return client
}
func (s *sharedClientFactory) getClient(gvr schema.GroupVersionResource) *Client {
s.createLock.RLock()
defer s.createLock.RUnlock()
return s.clients[gvr]
}
func populateConfig(scheme *runtime.Scheme, config *rest.Config) (*rest.Config, time.Duration) {
config = rest.CopyConfig(config)
config.NegotiatedSerializer = unstructuredNegotiator{
NegotiatedSerializer: serializer.NewCodecFactory(scheme).WithoutConversion(),
}
if config.UserAgent == "" {
config.UserAgent = rest.DefaultKubernetesUserAgent()
}
timeout := config.Timeout
config.Timeout = 0
return config, timeout
}
type unstructuredNegotiator struct {
runtime.NegotiatedSerializer
}
func (u unstructuredNegotiator) DecoderToVersion(serializer runtime.Decoder, gv runtime.GroupVersioner) runtime.Decoder {
result := u.NegotiatedSerializer.DecoderToVersion(serializer, gv)
return unstructuredDecoder{
Decoder: result,
}
}
type unstructuredDecoder struct {
runtime.Decoder
}
func (u unstructuredDecoder) Decode(data []byte, defaults *schema.GroupVersionKind, into runtime.Object) (runtime.Object, *schema.GroupVersionKind, error) {
obj, gvk, err := u.Decoder.Decode(data, defaults, into)
if into == nil && runtime.IsNotRegisteredError(err) {
return u.Decode(data, defaults, &unstructured.Unstructured{})
}
return obj, gvk, err
}