add version parsing to metrics framework, use build version information for registry version

pkg/util/metrics/BUILD

@@ -14,10 +14,13 @@ go_library(
         "opts.go",
         "registry.go",
         "util.go",
+        "version_parser.go",
         "wrappers.go",
     ],
     importpath = "k8s.io/kubernetes/pkg/util/metrics",
     deps = [
+        "//pkg/version:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/version:go_default_library",
         "//staging/src/k8s.io/client-go/util/flowcontrol:go_default_library",
         "//vendor/github.com/blang/semver:go_default_library",
         "//vendor/github.com/prometheus/client_golang/prometheus:go_default_library",
@@ -32,9 +35,11 @@ go_test(
         "counter_test.go",
         "registry_test.go",
         "util_test.go",
+        "version_parser_test.go",
     ],
     embed = [":go_default_library"],
     deps = [
+        "//staging/src/k8s.io/apimachinery/pkg/version:go_default_library",
         "//staging/src/k8s.io/client-go/util/flowcontrol:go_default_library",
         "//vendor/github.com/blang/semver:go_default_library",
         "//vendor/github.com/prometheus/client_golang/prometheus:go_default_library",

pkg/util/metrics/counter.go

@@ -33,13 +33,13 @@ type kubeCounter struct {
 // NewCounter returns an object which satisfies the KubeCollector and KubeCounter interfaces.
 // However, the object returned will not measure anything unless the collector is first
 // registered, since the metric is lazily instantiated.
-func NewCounter(opts CounterOpts) *kubeCounter {
+func NewCounter(opts *CounterOpts) *kubeCounter {
 	// todo: handle defaulting better
 	if opts.StabilityLevel == "" {
 		opts.StabilityLevel = ALPHA
 	}
 	kc := &kubeCounter{
-		CounterOpts: &opts,
+		CounterOpts: opts,
 		lazyMetric:  lazyMetric{},
 	}
 	kc.setPrometheusCounter(noop)
@@ -85,10 +85,10 @@ type kubeCounterVec struct {
 // NewCounterVec returns an object which satisfies the KubeCollector and KubeCounterVec interfaces.
 // However, the object returned will not measure anything unless the collector is first
 // registered, since the metric is lazily instantiated.
-func NewCounterVec(opts CounterOpts, labels []string) *kubeCounterVec {
+func NewCounterVec(opts *CounterOpts, labels []string) *kubeCounterVec {
 	cv := &kubeCounterVec{
 		CounterVec:     noopCounterVec,
-		CounterOpts:    &opts,
+		CounterOpts:    opts,
 		originalLabels: labels,
 		lazyMetric:     lazyMetric{},
 	}

pkg/util/metrics/counter_test.go

@@ -28,14 +28,14 @@ func TestCounter(t *testing.T) {
 	v114 := semver.MustParse("1.14.0")
 	var tests = []struct {
 		desc string
-		CounterOpts
+		*CounterOpts
 		registryVersion     *semver.Version
 		expectedMetricCount int
 		expectedHelp        string
 	}{
 		{
 			desc: "Test non deprecated",
-			CounterOpts: CounterOpts{
+			CounterOpts: &CounterOpts{
 				Namespace:      "namespace",
 				Name:           "metric_test_name",
 				Subsystem:      "subsystem",
@@ -48,7 +48,7 @@ func TestCounter(t *testing.T) {
 		},
 		{
 			desc: "Test deprecated",
-			CounterOpts: CounterOpts{
+			CounterOpts: &CounterOpts{
 				Namespace:         "namespace",
 				Name:              "metric_test_name",
 				Subsystem:         "subsystem",
@@ -62,7 +62,7 @@ func TestCounter(t *testing.T) {
 		},
 		{
 			desc: "Test hidden",
-			CounterOpts: CounterOpts{
+			CounterOpts: &CounterOpts{
 				Namespace:         "namespace",
 				Name:              "metric_test_name",
 				Subsystem:         "subsystem",
@@ -77,7 +77,7 @@ func TestCounter(t *testing.T) {
 
 	for _, test := range tests {
 		t.Run(test.desc, func(t *testing.T) {
-			registry := NewKubeRegistry(*test.registryVersion)
+			registry := newKubeRegistry(*test.registryVersion)
 			c := NewCounter(test.CounterOpts)
 			registry.MustRegister(c)
 
@@ -126,7 +126,7 @@ func TestCounterVec(t *testing.T) {
 	v114 := semver.MustParse("1.14.0")
 	var tests = []struct {
 		desc string
-		CounterOpts
+		*CounterOpts
 		labels                    []string
 		registryVersion           *semver.Version
 		expectedMetricFamilyCount int
@@ -134,7 +134,7 @@ func TestCounterVec(t *testing.T) {
 	}{
 		{
 			desc: "Test non deprecated",
-			CounterOpts: CounterOpts{
+			CounterOpts: &CounterOpts{
 				Namespace: "namespace",
 				Name:      "metric_test_name",
 				Subsystem: "subsystem",
@@ -147,7 +147,7 @@ func TestCounterVec(t *testing.T) {
 		},
 		{
 			desc: "Test deprecated",
-			CounterOpts: CounterOpts{
+			CounterOpts: &CounterOpts{
 				Namespace:         "namespace",
 				Name:              "metric_test_name",
 				Subsystem:         "subsystem",
@@ -161,7 +161,7 @@ func TestCounterVec(t *testing.T) {
 		},
 		{
 			desc: "Test hidden",
-			CounterOpts: CounterOpts{
+			CounterOpts: &CounterOpts{
 				Namespace:         "namespace",
 				Name:              "metric_test_name",
 				Subsystem:         "subsystem",
@@ -177,7 +177,7 @@ func TestCounterVec(t *testing.T) {
 
 	for _, test := range tests {
 		t.Run(test.desc, func(t *testing.T) {
-			registry := NewKubeRegistry(*test.registryVersion)
+			registry := newKubeRegistry(*test.registryVersion)
 			c := NewCounterVec(test.CounterOpts, test.labels)
 			registry.MustRegister(c)
 			c.WithLabelValues("1", "2").Inc()

pkg/util/metrics/metric.go

@@ -29,7 +29,7 @@ This extends the prometheus.Collector interface to allow customization of the me
 registration process. Defer metric initialization until Create() is called, which then
 delegates to the underlying metric's initializeMetric or initializeDeprecatedMetric
 method call depending on whether the metric is deprecated or not.
- */
+*/
 type KubeCollector interface {
 	Collector
 	LazyMetric
@@ -46,7 +46,7 @@ type KubeCollector interface {
 LazyMetric defines our registration functionality. LazyMetric objects are expected
 to lazily instantiate metrics (i.e defer metric instantiation until when
 the Create() function is explicitly called).
- */
+*/
 type LazyMetric interface {
 	Create(*semver.Version) bool
 	IsCreated() bool
@@ -59,7 +59,7 @@ lazyMetric implements LazyMetric. A lazy metric is lazy because it waits until m
 registration time before instantiation. Add it as an anonymous field to a struct that
 implements KubeCollector to get deferred registration behavior. You must call lazyInit
 with the KubeCollector itself as an argument.
- */
+*/
 type lazyMetric struct {
 	isDeprecated        bool
 	isHidden            bool
@@ -136,7 +136,7 @@ This code is directly lifted from the prometheus codebase. It's a convenience st
 allows you satisfy the Collector interface automatically if you already satisfy the Metric interface.
 
 For reference: https://github.com/prometheus/client_golang/blob/v0.9.2/prometheus/collector.go#L98-L120
- */
+*/
 type selfCollector struct {
 	metric prometheus.Metric
 }

pkg/util/metrics/opts.go

@@ -67,7 +67,7 @@ func (o *CounterOpts) annotateStabilityLevel() {
 
 // convenience function to allow easy transformation to the prometheus
 // counterpart. This will do more once we have a proper label abstraction
-func (o CounterOpts) toPromCounterOpts() prometheus.CounterOpts {
+func (o *CounterOpts) toPromCounterOpts() prometheus.CounterOpts {
 	return prometheus.CounterOpts{
 		Namespace:   o.Namespace,
 		Subsystem:   o.Subsystem,

pkg/util/metrics/registry.go

@@ -20,12 +20,11 @@ import (
 	"github.com/blang/semver"
 	"github.com/prometheus/client_golang/prometheus"
 	dto "github.com/prometheus/client_model/go"
+	"k8s.io/klog"
+	"k8s.io/kubernetes/pkg/version"
 )
 
-var (
-	// todo: load the version dynamically at application boot.
-	DefaultGlobalRegistry = NewKubeRegistry(semver.MustParse("1.15.0"))
-)
+var DefaultGlobalRegistry = NewKubeRegistry()
 
 type KubeRegistry struct {
 	PromRegistry
@@ -69,9 +68,23 @@ func (kr *KubeRegistry) Gather() ([]*dto.MetricFamily, error) {
 	return kr.PromRegistry.Gather()
 }
 
-// NewRegistry creates a new vanilla Registry without any Collectors
+func NewKubeRegistry() *KubeRegistry {
+	v, err := parseVersion(version.Get())
+	if err != nil {
+		klog.Fatalf("Can't initialize a registry without a valid version %v", err)
+	}
+	if v == nil {
+		klog.Fatalf("No valid version %v", *v)
+	}
+	return &KubeRegistry{
+		PromRegistry: prometheus.NewRegistry(),
+		version:      semver.MustParse(*v),
+	}
+}
+
+// newKubeRegistry creates a new vanilla Registry without any Collectors
 // pre-registered.
-func NewKubeRegistry(version semver.Version) *KubeRegistry {
+func newKubeRegistry(version semver.Version) *KubeRegistry {
 	return &KubeRegistry{
 		PromRegistry: prometheus.NewRegistry(),
 		version:      version,

pkg/util/metrics/registry_test.go

@@ -27,7 +27,7 @@ var (
 	v115         = semver.MustParse("1.15.0")
 	v114         = semver.MustParse("1.14.0")
 	alphaCounter = NewCounter(
-		CounterOpts{
+		&CounterOpts{
 			Namespace:      "some_namespace",
 			Name:           "test_counter_name",
 			Subsystem:      "subsystem",
@@ -36,7 +36,7 @@ var (
 		},
 	)
 	alphaDeprecatedCounter = NewCounter(
-		CounterOpts{
+		&CounterOpts{
 			Namespace:         "some_namespace",
 			Name:              "test_alpha_dep_counter",
 			Subsystem:         "subsystem",
@@ -46,7 +46,7 @@ var (
 		},
 	)
 	alphaHiddenCounter = NewCounter(
-		CounterOpts{
+		&CounterOpts{
 			Namespace:         "some_namespace",
 			Name:              "test_alpha_hidden_counter",
 			Subsystem:         "subsystem",
@@ -56,7 +56,7 @@ var (
 		},
 	)
 	stableCounter = NewCounter(
-		CounterOpts{
+		&CounterOpts{
 			Namespace:      "some_namespace",
 			Name:           "test_some_other_counter",
 			Subsystem:      "subsystem",
@@ -116,7 +116,7 @@ func TestRegister(t *testing.T) {
 
 	for _, test := range tests {
 		t.Run(test.desc, func(t *testing.T) {
-			registry := NewKubeRegistry(*test.registryVersion)
+			registry := newKubeRegistry(*test.registryVersion)
 			for i, m := range test.metrics {
 				err := registry.Register(m)
 				if err != test.expectedErrors[i] && err.Error() != test.expectedErrors[i].Error() {
@@ -183,7 +183,7 @@ func TestMustRegister(t *testing.T) {
 
 	for _, test := range tests {
 		t.Run(test.desc, func(t *testing.T) {
-			registry := NewKubeRegistry(*test.registryVersion)
+			registry := newKubeRegistry(*test.registryVersion)
 			for i, m := range test.metrics {
 				if test.expectedPanics[i] {
 					assert.Panics(t,

pkg/util/metrics/version_parser.go

@@ -0,0 +1,40 @@
+/*
+Copyright 2019 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"
+	apimachineryversion "k8s.io/apimachinery/pkg/version"
+	"regexp"
+)
+
+const (
+	versionRegexpString = `^v(\d+\.\d+\.\d+)`
+)
+
+var (
+	versionRe = regexp.MustCompile(versionRegexpString)
+)
+
+func parseVersion(ver apimachineryversion.Info) (*string, error) {
+	matches := versionRe.FindAllStringSubmatch(ver.String(), -1)
+
+	if len(matches) != 1 {
+		return nil, fmt.Errorf("version string \"%v\" doesn't match expected regular expression: \"%v\"", ver.String(), versionRe.String())
+	}
+	return &matches[0][1], nil
+}

pkg/util/metrics/version_parser_test.go

@@ -0,0 +1,56 @@
+/*
+Copyright 2019 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 (
+	apimachineryversion "k8s.io/apimachinery/pkg/version"
+	"testing"
+)
+
+func TestVersionParsing(t *testing.T) {
+	var tests = []struct {
+		desc            string
+		versionString   string
+		expectedVersion string
+	}{
+		{
+			"v1.15.0-alpha-1.12345",
+			"v1.15.0-alpha-1.12345",
+			"1.15.0",
+		},
+		{
+			"Parse out defaulted string",
+			"v0.0.0-master",
+			"0.0.0",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.desc, func(t *testing.T) {
+			version := apimachineryversion.Info{
+				GitVersion: test.versionString,
+			}
+			parsedV, err := parseVersion(version)
+			if err != nil {
+				t.Fatalf("Should be able to parse %v", version)
+			}
+			if test.expectedVersion != *parsedV {
+				t.Errorf("Got %v, wanted %v", *parsedV, test.expectedVersion)
+			}
+		})
+	}
+}