Add generated file

This PR adds generated files under pkg/client and vendor folder.

vendor/k8s.io/kubernetes/pkg/util/metrics/BUILD

@@ -0,0 +1,40 @@
+package(default_visibility = ["//visibility:public"])
+
+load(
+    "@io_bazel_rules_go//go:def.bzl",
+    "go_library",
+    "go_test",
+)
+
+go_library(
+    name = "go_default_library",
+    srcs = ["util.go"],
+    importpath = "k8s.io/kubernetes/pkg/util/metrics",
+    deps = [
+        "//vendor/github.com/golang/glog:go_default_library",
+        "//vendor/github.com/prometheus/client_golang/prometheus:go_default_library",
+        "//vendor/k8s.io/client-go/util/flowcontrol:go_default_library",
+    ],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = ["util_test.go"],
+    embed = [":go_default_library"],
+    deps = [
+        "//vendor/k8s.io/client-go/util/flowcontrol:go_default_library",
+    ],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+)

vendor/k8s.io/kubernetes/pkg/util/metrics/util.go

@@ -0,0 +1,100 @@
+/*
+Copyright 2015 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 metrics
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"k8s.io/client-go/util/flowcontrol"
+
+	"github.com/golang/glog"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+const (
+	updatePeriod = 5 * time.Second
+)
+
+var (
+	metricsLock        sync.Mutex
+	rateLimiterMetrics = make(map[string]rateLimiterMetric)
+)
+
+type rateLimiterMetric struct {
+	metric prometheus.Gauge
+	stopCh chan struct{}
+}
+
+func registerRateLimiterMetric(ownerName string) error {
+	metricsLock.Lock()
+	defer metricsLock.Unlock()
+
+	if _, ok := rateLimiterMetrics[ownerName]; ok {
+		return fmt.Errorf("Rate Limiter Metric for %v already registered", ownerName)
+	}
+	metric := prometheus.NewGauge(prometheus.GaugeOpts{
+		Name:      "rate_limiter_use",
+		Subsystem: ownerName,
+		Help:      fmt.Sprintf("A metric measuring the saturation of the rate limiter for %v", ownerName),
+	})
+	if err := prometheus.Register(metric); err != nil {
+		return fmt.Errorf("error registering rate limiter usage metric: %v", err)
+	}
+	stopCh := make(chan struct{})
+	rateLimiterMetrics[ownerName] = rateLimiterMetric{
+		metric: metric,
+		stopCh: stopCh,
+	}
+	return nil
+}
+
+// RegisterMetricAndTrackRateLimiterUsage registers a metric ownerName_rate_limiter_use in prometheus to track
+// how much used rateLimiter is and starts a goroutine that updates this metric every updatePeriod
+func RegisterMetricAndTrackRateLimiterUsage(ownerName string, rateLimiter flowcontrol.RateLimiter) error {
+	if err := registerRateLimiterMetric(ownerName); err != nil {
+		return err
+	}
+	// TODO: determine how to track rate limiter saturation
+	// See discussion at https://go-review.googlesource.com/c/time/+/29958#message-4caffc11669cadd90e2da4c05122cfec50ea6a22
+	// go wait.Until(func() {
+	//   metricsLock.Lock()
+	//   defer metricsLock.Unlock()
+	//   rateLimiterMetrics[ownerName].metric.Set()
+	// }, updatePeriod, rateLimiterMetrics[ownerName].stopCh)
+	return nil
+}
+
+// UnregisterMetricAndUntrackRateLimiterUsage unregisters a metric ownerName_rate_limiter_use from prometheus and
+// stops the goroutine that updates this metric
+func UnregisterMetricAndUntrackRateLimiterUsage(ownerName string) bool {
+	metricsLock.Lock()
+	defer metricsLock.Unlock()
+
+	rlm, ok := rateLimiterMetrics[ownerName]
+	if !ok {
+		glog.Warningf("Rate Limiter Metric for %v not registered", ownerName)
+		return false
+	}
+
+	close(rlm.stopCh)
+	prometheus.Unregister(rlm.metric)
+	delete(rateLimiterMetrics, ownerName)
+
+	return true
+}

vendor/k8s.io/kubernetes/pkg/util/metrics/util_test.go

@@ -0,0 +1,83 @@
+/*
+Copyright 2017 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 metrics
+
+import (
+	"strings"
+	"testing"
+
+	"k8s.io/client-go/util/flowcontrol"
+)
+
+func TestRegisterMetricAndTrackRateLimiterUsage(t *testing.T) {
+	testCases := []struct {
+		ownerName   string
+		rateLimiter flowcontrol.RateLimiter
+		err         string
+	}{
+		{
+			ownerName:   "owner_name",
+			rateLimiter: flowcontrol.NewTokenBucketRateLimiter(1, 1),
+			err:         "",
+		},
+		{
+			ownerName:   "owner_name",
+			rateLimiter: flowcontrol.NewTokenBucketRateLimiter(1, 1),
+			err:         "already registered",
+		},
+		{
+			ownerName:   "invalid-owner-name",
+			rateLimiter: flowcontrol.NewTokenBucketRateLimiter(1, 1),
+			err:         "error registering rate limiter usage metric",
+		},
+	}
+
+	for i, tc := range testCases {
+		e := RegisterMetricAndTrackRateLimiterUsage(tc.ownerName, tc.rateLimiter)
+		if e != nil {
+			if tc.err == "" {
+				t.Errorf("[%d] unexpected error: %v", i, e)
+			} else if !strings.Contains(e.Error(), tc.err) {
+				t.Errorf("[%d] expected an error containing %q: %v", i, tc.err, e)
+			}
+		}
+	}
+}
+
+func TestUnregisterMetricAndUntrackRateLimiterUsage(t *testing.T) {
+	RegisterMetricAndTrackRateLimiterUsage("owner_name", flowcontrol.NewTokenBucketRateLimiter(1, 1))
+	testCases := []struct {
+		ownerName string
+		ok        bool
+	}{
+		{
+			ownerName: "owner_name",
+			ok:        true,
+		},
+		{
+			ownerName: "owner_name",
+			ok:        false,
+		},
+	}
+
+	for i, tc := range testCases {
+		ok := UnregisterMetricAndUntrackRateLimiterUsage(tc.ownerName)
+		if tc.ok != ok {
+			t.Errorf("Case[%d] Expected %v, got %v", i, tc.ok, ok)
+		}
+	}
+}