make *http.Client configurable

Signed-off-by: Tim Ramlot <42113979+inteon@users.noreply.github.com>

pkg/cache/cache.go

@@ -19,6 +19,7 @@ package cache
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"reflect"
 	"time"
 
@@ -158,6 +159,15 @@ var defaultResyncTime = 10 * time.Hour
 
 // New initializes and returns a new Cache.
 func New(config *rest.Config, opts Options) (Cache, error) {
+	httpClient, err := rest.HTTPClientFor(config)
+	if err != nil {
+		return nil, err
+	}
+	return NewForConfigAndClient(config, httpClient, opts)
+}
+
+// NewForConfigAndClient initializes and returns a new Cache.
+func NewForConfigAndClient(config *rest.Config, httpClient *http.Client, opts Options) (Cache, error) {
 	opts, err := defaultOpts(config, opts)
 	if err != nil {
 		return nil, err
@@ -183,7 +193,7 @@ func New(config *rest.Config, opts Options) (Cache, error) {
 
 	return &informerCache{
 		scheme: opts.Scheme,
-		InformersMap: internal.NewInformersMap(config, &internal.InformersMapOptions{
+		InformersMap: internal.NewInformersMapForConfigAndClient(config, httpClient, &internal.InformersMapOptions{
 			Scheme:       opts.Scheme,
 			Mapper:       opts.Mapper,
 			ResyncPeriod: *opts.Resync,

pkg/cache/internal/informers_map.go

@@ -20,6 +20,7 @@ import (
 	"context"
 	"fmt"
 	"math/rand"
+	"net/http"
 	"sync"
 	"time"
 
@@ -60,11 +61,33 @@ type InformersMapOptionsByGVK struct {
 }
 
 // NewInformersMap creates a new InformersMap that can create informers under the hood.
+// Deprecated: use NewInformersMapForConfig instead.
 func NewInformersMap(config *rest.Config, options *InformersMapOptions) *InformersMap {
+	informersMap, err := NewInformersMapForConfig(config, options)
+	if err != nil {
+		panic(fmt.Sprintf("unable to create informers map: %v", err))
+	}
+	return informersMap
+}
+
+// NewInformersMapForConfig creates a new InformersMap that can create informers under the hood.
+// It differs from NewInformersMap in that allows you to pass in a custom http.Client.
+func NewInformersMapForConfig(config *rest.Config, options *InformersMapOptions) (*InformersMap, error) {
+	httpClient, err := rest.HTTPClientFor(config)
+	if err != nil {
+		return nil, err
+	}
+	return NewInformersMapForConfigAndClient(config, httpClient, options), nil
+}
+
+// NewInformersMapForConfigAndClient creates a new InformersMap that can create informers under the hood.
+// It differs from NewInformersMapForConfig in that it allows you to pass in a custom http.Client.
+func NewInformersMapForConfigAndClient(config *rest.Config, h *http.Client, options *InformersMapOptions) *InformersMap {
 	return &InformersMap{
-		config: config,
-		scheme: options.Scheme,
-		mapper: options.Mapper,
+		httpClient: h,
+		config:     config,
+		scheme:     options.Scheme,
+		mapper:     options.Mapper,
 		informers: informers{
 			Structured:   make(map[schema.GroupVersionKind]*MapEntry),
 			Unstructured: make(map[schema.GroupVersionKind]*MapEntry),
@@ -99,6 +122,9 @@ type informers struct {
 // InformersMap create and caches Informers for (runtime.Object, schema.GroupVersionKind) pairs.
 // It uses a standard parameter codec constructed based on the given generated Scheme.
 type InformersMap struct {
+	// httpClient is used to create a new REST client
+	httpClient *http.Client
+
 	// scheme maps runtime.Objects to GroupVersionKinds
 	scheme *runtime.Scheme
 
@@ -343,7 +369,7 @@ func (ip *InformersMap) makeListWatcher(gvk schema.GroupVersionKind, obj runtime
 		// we should remove it and use the one that the dynamic client sets for us.
 		cfg := rest.CopyConfig(ip.config)
 		cfg.NegotiatedSerializer = nil
-		dynamicClient, err := dynamic.NewForConfig(cfg)
+		dynamicClient, err := dynamic.NewForConfigAndClient(cfg, ip.httpClient)
 		if err != nil {
 			return nil, err
 		}
@@ -373,7 +399,7 @@ func (ip *InformersMap) makeListWatcher(gvk schema.GroupVersionKind, obj runtime
 		cfg.NegotiatedSerializer = nil
 
 		// Grab the metadata metadataClient.
-		metadataClient, err := metadata.NewForConfig(cfg)
+		metadataClient, err := metadata.NewForConfigAndClient(cfg, ip.httpClient)
 		if err != nil {
 			return nil, err
 		}
@@ -414,7 +440,7 @@ func (ip *InformersMap) makeListWatcher(gvk schema.GroupVersionKind, obj runtime
 	// Structured.
 	//
 	default:
-		client, err := apiutil.RESTClientForGVK(gvk, false, ip.config, ip.codecs)
+		client, err := apiutil.RESTClientForGVKAndClient(gvk, false, ip.config, ip.codecs, ip.httpClient)
 		if err != nil {
 			return nil, err
 		}

pkg/client/apiutil/apimachinery.go

@@ -21,6 +21,7 @@ package apiutil
 
 import (
 	"fmt"
+	"net/http"
 	"reflect"
 	"sync"
 
@@ -122,6 +123,14 @@ func RESTClientForGVK(gvk schema.GroupVersionKind, isUnstructured bool, baseConf
 	return rest.RESTClientFor(createRestConfig(gvk, isUnstructured, baseConfig, codecs))
 }
 
+// RESTClientForGVKAndClient constructs a new rest.Interface capable of accessing the resource associated
+// with the given GroupVersionKind. The REST client will be configured to use the negotiated serializer from
+// baseConfig, if set, otherwise a default serializer will be set.
+// Unlike RESTClientForGVK, this function allows the caller to specify a custom http.Client.
+func RESTClientForGVKAndClient(gvk schema.GroupVersionKind, isUnstructured bool, baseConfig *rest.Config, codecs serializer.CodecFactory, httpClient *http.Client) (rest.Interface, error) {
+	return rest.RESTClientForConfigAndClient(createRestConfig(gvk, isUnstructured, baseConfig, codecs), httpClient)
+}
+
 // serializerWithDecodedGVK is a CodecFactory that overrides the DecoderToVersion of a WithoutConversionCodecFactory
 // in order to avoid clearing the GVK from the decoded object.
 //

pkg/client/apiutil/dynamicrestmapper.go

@@ -17,6 +17,7 @@ limitations under the License.
 package apiutil
 
 import (
+	"net/http"
 	"sync"
 	"sync/atomic"
 
@@ -76,7 +77,19 @@ func WithCustomMapper(newMapper func() (meta.RESTMapper, error)) DynamicRESTMapp
 // RESTMapper dynamically discovers resource types at runtime. opts
 // configure the RESTMapper.
 func NewDynamicRESTMapper(cfg *rest.Config, opts ...DynamicRESTMapperOption) (meta.RESTMapper, error) {
-	client, err := discovery.NewDiscoveryClientForConfig(cfg)
+	httpClient, err := rest.HTTPClientFor(cfg)
+	if err != nil {
+		return nil, err
+	}
+	return NewDynamicRESTMapperForConfigAndClient(cfg, httpClient, opts...)
+}
+
+// NewDynamicRESTMapperForConfigAndClient returns a dynamic RESTMapper for cfg. The dynamic
+// RESTMapper dynamically discovers resource types at runtime. opts
+// configure the RESTMapper.
+// Unlike NewDynamicRESTMapper, this function allows you to specify a custom http client.
+func NewDynamicRESTMapperForConfigAndClient(cfg *rest.Config, httpClient *http.Client, opts ...DynamicRESTMapperOption) (meta.RESTMapper, error) {
+	client, err := discovery.NewDiscoveryClientForConfigAndClient(cfg, httpClient)
 	if err != nil {
 		return nil, err
 	}

pkg/client/client.go

@@ -20,6 +20,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"net/http"
 	"strings"
 
 	"k8s.io/apimachinery/pkg/api/meta"
@@ -74,14 +75,37 @@ type Options struct {
 // case of unstructured types, the group, version, and kind will be extracted
 // from the corresponding fields on the object.
 func New(config *rest.Config, options Options) (Client, error) {
-	return newClient(config, options)
+	httpClient, err := rest.HTTPClientFor(config)
+	if err != nil {
+		return nil, err
+	}
+	return newClient(config, httpClient, options)
 }
 
-func newClient(config *rest.Config, options Options) (*client, error) {
+// NewForConfigAndClient returns a new Client using the provided config and Options.
+// The returned client reads *and* writes directly from the server
+// (it doesn't use object caches).  It understands how to work with
+// normal types (both custom resources and aggregated/built-in resources),
+// as well as unstructured types.
+//
+// In the case of normal types, the scheme will be used to look up the
+// corresponding group, version, and kind for the given type.  In the
+// case of unstructured types, the group, version, and kind will be extracted
+// from the corresponding fields on the object.
+// Unlike New, this function allows you to provide your own http.Client.
+func NewForConfigAndClient(config *rest.Config, httpClient *http.Client, options Options) (Client, error) {
+	return newClient(config, httpClient, options)
+}
+
+func newClient(config *rest.Config, httpClient *http.Client, options Options) (*client, error) {
 	if config == nil {
 		return nil, fmt.Errorf("must provide non-nil rest.Config to client.New")
 	}
 
+	if httpClient == nil {
+		return nil, fmt.Errorf("must provide non-nil http.Client to client.NewForConfigAndClient")
+	}
+
 	if !options.Opts.SuppressWarnings {
 		// surface warnings
 		logger := log.Log.WithName("KubeAPIWarningLogger")
@@ -113,16 +137,17 @@ func newClient(config *rest.Config, options Options) (*client, error) {
 	}
 
 	resources := &clientRestResources{
-		config: config,
-		scheme: options.Scheme,
-		mapper: options.Mapper,
-		codecs: serializer.NewCodecFactory(options.Scheme),
+		httpClient: httpClient,
+		config:     config,
+		scheme:     options.Scheme,
+		mapper:     options.Mapper,
+		codecs:     serializer.NewCodecFactory(options.Scheme),
 
 		structuredResourceByType:   make(map[schema.GroupVersionKind]*resourceMeta),
 		unstructuredResourceByType: make(map[schema.GroupVersionKind]*resourceMeta),
 	}
 
-	rawMetaClient, err := metadata.NewForConfig(config)
+	rawMetaClient, err := metadata.NewForConfigAndClient(config, httpClient)
 	if err != nil {
 		return nil, fmt.Errorf("unable to construct metadata-only client for use as part of client: %w", err)
 	}

pkg/client/client_rest_resources.go

@@ -17,6 +17,7 @@ limitations under the License.
 package client
 
 import (
+	"net/http"
 	"strings"
 	"sync"
 
@@ -32,6 +33,9 @@ import (
 
 // clientRestResources creates and stores rest clients and metadata for Kubernetes types.
 type clientRestResources struct {
+	// httpClient is the http client to use for requests
+	httpClient *http.Client
+
 	// config is the rest.Config to talk to an apiserver
 	config *rest.Config
 
@@ -59,7 +63,7 @@ func (c *clientRestResources) newResource(gvk schema.GroupVersionKind, isList, i
 		gvk.Kind = gvk.Kind[:len(gvk.Kind)-4]
 	}
 
-	client, err := apiutil.RESTClientForGVK(gvk, isUnstructured, c.config, c.codecs)
+	client, err := apiutil.RESTClientForGVKAndClient(gvk, isUnstructured, c.config, c.codecs, c.httpClient)
 	if err != nil {
 		return nil, err
 	}

pkg/client/watch.go

@@ -18,6 +18,7 @@ package client
 
 import (
 	"context"
+	"net/http"
 	"strings"
 
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -29,11 +30,21 @@ import (
 
 // NewWithWatch returns a new WithWatch.
 func NewWithWatch(config *rest.Config, options Options) (WithWatch, error) {
-	client, err := newClient(config, options)
+	httpClient, err := rest.HTTPClientFor(config)
 	if err != nil {
 		return nil, err
 	}
-	dynamicClient, err := dynamic.NewForConfig(config)
+	return NewWithWatchForConfigAndClient(config, httpClient, options)
+}
+
+// NewWithWatchForConfigAndClient is a client that can watch objects.
+// It differs from NewForConfigAndClient in that it returns a client that can watch objects.
+func NewWithWatchForConfigAndClient(config *rest.Config, httpClient *http.Client, options Options) (WithWatch, error) {
+	client, err := newClient(config, httpClient, options)
+	if err != nil {
+		return nil, err
+	}
+	dynamicClient, err := dynamic.NewForConfigAndClient(config, httpClient)
 	if err != nil {
 		return nil, err
 	}

pkg/cluster/cluster.go

@@ -19,6 +19,7 @@ package cluster
 import (
 	"context"
 	"errors"
+	"net/http"
 	"time"
 
 	"github.com/go-logr/logr"
@@ -105,6 +106,11 @@ type Options struct {
 	// will only hold objects from the desired namespace.
 	Namespace string
 
+	// HTTPClient is the http client that will be used to create the default
+	// Cache and Client. If not set the rest.HTTPClientFor function will be used
+	// to create the http client.
+	HTTPClient *http.Client
+
 	// NewCache is the function that will create the cache to be used
 	// by the manager. If not set this will use the default new cache function.
 	NewCache cache.NewCacheFunc
@@ -153,7 +159,7 @@ func New(config *rest.Config, opts ...Option) (Cluster, error) {
 	for _, opt := range opts {
 		opt(&options)
 	}
-	options = setOptionsDefaults(options)
+	options = setOptionsDefaults(options, config)
 
 	// Create the mapper provider
 	mapper, err := options.MapperProvider(config)
@@ -206,31 +212,47 @@ func New(config *rest.Config, opts ...Option) (Cluster, error) {
 }
 
 // setOptionsDefaults set default values for Options fields.
-func setOptionsDefaults(options Options) Options {
+func setOptionsDefaults(options Options, config *rest.Config) Options {
+	if options.HTTPClient == nil {
+		httpClient, err := rest.HTTPClientFor(config)
+		if err != nil {
+			panic(err)
+		}
+		options.HTTPClient = httpClient
+	}
+
 	// Use the Kubernetes client-go scheme if none is specified
 	if options.Scheme == nil {
 		options.Scheme = scheme.Scheme
 	}
 
 	if options.MapperProvider == nil {
 		options.MapperProvider = func(c *rest.Config) (meta.RESTMapper, error) {
-			return apiutil.NewDynamicRESTMapper(c)
+			return apiutil.NewDynamicRESTMapperForConfigAndClient(c, options.HTTPClient)
 		}
 	}
 
 	// Allow users to define how to create a new client
 	if options.NewClient == nil {
-		options.NewClient = DefaultNewClient
+		options.NewClient = func(cache cache.Cache, config *rest.Config, clientOptions client.Options, uncachedObjects ...client.Object) (client.Client, error) {
+			return ClientBuilderWithOptions(ClientOptions{
+				HTTPClient: options.HTTPClient,
+			})(cache, config, clientOptions, uncachedObjects...)
+		}
 	}
 
 	// Allow newCache to be mocked
 	if options.NewCache == nil {
-		options.NewCache = cache.New
+		options.NewCache = func(config *rest.Config, opts cache.Options) (cache.Cache, error) {
+			return cache.NewForConfigAndClient(config, options.HTTPClient, opts)
+		}
 	}
 
 	// Allow newRecorderProvider to be mocked
 	if options.newRecorderProvider == nil {
-		options.newRecorderProvider = intrec.NewProvider
+		options.newRecorderProvider = func(config *rest.Config, scheme *runtime.Scheme, logger logr.Logger, makeBroadcaster intrec.EventBroadcasterProducer) (*intrec.Provider, error) {
+			return intrec.NewProviderForConfigAndClient(config, options.HTTPClient, scheme, logger, makeBroadcaster)
+		}
 	}
 
 	// This is duplicated with pkg/manager, we need it here to provide
@@ -260,6 +282,7 @@ type NewClientFunc func(cache cache.Cache, config *rest.Config, options client.O
 type ClientOptions struct {
 	UncachedObjects   []client.Object
 	CacheUnstructured bool
+	HTTPClient        *http.Client
 }
 
 // DefaultNewClient creates the default caching client, that will never cache Unstructured.
@@ -273,7 +296,7 @@ func ClientBuilderWithOptions(options ClientOptions) NewClientFunc {
 	return func(cache cache.Cache, config *rest.Config, clientOpts client.Options, uncachedObjects ...client.Object) (client.Client, error) {
 		options.UncachedObjects = append(options.UncachedObjects, uncachedObjects...)
 
-		c, err := client.New(config, clientOpts)
+		c, err := client.NewForConfigAndClient(config, options.HTTPClient, clientOpts)
 		if err != nil {
 			return nil, err
 		}