Add glide.yaml and vendor deps

vendor/k8s.io/kubernetes/plugin/pkg/webhook/BUILD

@@ -0,0 +1,29 @@
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+load(
+    "@io_bazel_rules_go//go:def.bzl",
+    "go_binary",
+    "go_library",
+    "go_test",
+    "cgo_library",
+)
+
+go_library(
+    name = "go_default_library",
+    srcs = ["webhook.go"],
+    tags = ["automanaged"],
+    deps = [
+        "//pkg/api:go_default_library",
+        "//pkg/api/errors:go_default_library",
+        "//pkg/apimachinery/registered:go_default_library",
+        "//pkg/apis/authorization/install:go_default_library",
+        "//pkg/client/restclient:go_default_library",
+        "//pkg/client/unversioned/clientcmd:go_default_library",
+        "//pkg/runtime:go_default_library",
+        "//pkg/runtime/schema:go_default_library",
+        "//pkg/runtime/serializer:go_default_library",
+        "//pkg/util/wait:go_default_library",
+    ],
+)

vendor/k8s.io/kubernetes/plugin/pkg/webhook/webhook.go

@@ -0,0 +1,107 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package webhook implements a generic HTTP webhook plugin.
+package webhook
+
+import (
+	"fmt"
+	"time"
+
+	"k8s.io/kubernetes/pkg/api"
+	apierrors "k8s.io/kubernetes/pkg/api/errors"
+	"k8s.io/kubernetes/pkg/apimachinery/registered"
+	"k8s.io/kubernetes/pkg/client/restclient"
+	"k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
+	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/runtime/schema"
+	runtimeserializer "k8s.io/kubernetes/pkg/runtime/serializer"
+	"k8s.io/kubernetes/pkg/util/wait"
+
+	_ "k8s.io/kubernetes/pkg/apis/authorization/install"
+)
+
+type GenericWebhook struct {
+	RestClient     *restclient.RESTClient
+	initialBackoff time.Duration
+}
+
+// NewGenericWebhook creates a new GenericWebhook from the provided kubeconfig file.
+func NewGenericWebhook(kubeConfigFile string, groupVersions []schema.GroupVersion, initialBackoff time.Duration) (*GenericWebhook, error) {
+	for _, groupVersion := range groupVersions {
+		if !registered.IsEnabledVersion(groupVersion) {
+			return nil, fmt.Errorf("webhook plugin requires enabling extension resource: %s", groupVersion)
+		}
+	}
+
+	loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
+	loadingRules.ExplicitPath = kubeConfigFile
+	loader := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, &clientcmd.ConfigOverrides{})
+
+	clientConfig, err := loader.ClientConfig()
+	if err != nil {
+		return nil, err
+	}
+	codec := api.Codecs.LegacyCodec(groupVersions...)
+	clientConfig.ContentConfig.NegotiatedSerializer = runtimeserializer.NegotiatedSerializerWrapper(runtime.SerializerInfo{Serializer: codec})
+
+	restClient, err := restclient.UnversionedRESTClientFor(clientConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	// TODO(ericchiang): Can we ensure remote service is reachable?
+
+	return &GenericWebhook{restClient, initialBackoff}, nil
+}
+
+// WithExponentialBackoff will retry webhookFn() up to 5 times with exponentially increasing backoff when
+// it returns an error for which apierrors.SuggestsClientDelay() or apierrors.IsInternalError() returns true.
+func (g *GenericWebhook) WithExponentialBackoff(webhookFn func() restclient.Result) restclient.Result {
+	var result restclient.Result
+	WithExponentialBackoff(g.initialBackoff, func() error {
+		result = webhookFn()
+		return result.Error()
+	})
+	return result
+}
+
+// WithExponentialBackoff will retry webhookFn() up to 5 times with exponentially increasing backoff when
+// it returns an error for which apierrors.SuggestsClientDelay() or apierrors.IsInternalError() returns true.
+func WithExponentialBackoff(initialBackoff time.Duration, webhookFn func() error) error {
+	backoff := wait.Backoff{
+		Duration: initialBackoff,
+		Factor:   1.5,
+		Jitter:   0.2,
+		Steps:    5,
+	}
+
+	var err error
+	wait.ExponentialBackoff(backoff, func() (bool, error) {
+		err = webhookFn()
+		if _, shouldRetry := apierrors.SuggestsClientDelay(err); shouldRetry {
+			return false, nil
+		}
+		if apierrors.IsInternalError(err) {
+			return false, nil
+		}
+		if err != nil {
+			return false, err
+		}
+		return true, nil
+	})
+	return err
+}