Cleanup math/rand package usage

Kubernetes-commit: 4ce1fb7d40beb9010e56d60792c4da25e8d86ed0

tools/record/event.go

@@ -162,17 +162,14 @@ type eventBroadcasterImpl struct {
 // The return value can be ignored or used to stop recording, if desired.
 // TODO: make me an object with parameterizable queue length and retry interval
 func (eventBroadcaster *eventBroadcasterImpl) StartRecordingToSink(sink EventSink) watch.Interface {
-	// The default math/rand package functions aren't thread safe, so create a
-	// new Rand object for each StartRecording call.
-	randGen := rand.New(rand.NewSource(time.Now().UnixNano()))
 	eventCorrelator := NewEventCorrelatorWithOptions(eventBroadcaster.options)
 	return eventBroadcaster.StartEventWatcher(
 		func(event *v1.Event) {
-			recordToSink(sink, event, eventCorrelator, randGen, eventBroadcaster.sleepDuration)
+			recordToSink(sink, event, eventCorrelator, eventBroadcaster.sleepDuration)
 		})
 }
 
-func recordToSink(sink EventSink, event *v1.Event, eventCorrelator *EventCorrelator, randGen *rand.Rand, sleepDuration time.Duration) {
+func recordToSink(sink EventSink, event *v1.Event, eventCorrelator *EventCorrelator, sleepDuration time.Duration) {
 	// Make a copy before modification, because there could be multiple listeners.
 	// Events are safe to copy like this.
 	eventCopy := *event
@@ -197,7 +194,7 @@ func recordToSink(sink EventSink, event *v1.Event, eventCorrelator *EventCorrela
 		// Randomize the first sleep so that various clients won't all be
 		// synced up if the master goes down.
 		if tries == 1 {
-			time.Sleep(time.Duration(float64(sleepDuration) * randGen.Float64()))
+			time.Sleep(time.Duration(float64(sleepDuration) * rand.Float64()))
 		} else {
 			time.Sleep(sleepDuration)
 		}

tools/record/event_test.go

@@ -19,7 +19,6 @@ package record
 import (
 	"encoding/json"
 	"fmt"
-	"math/rand"
 	"net/http"
 	"strconv"
 	"testing"
@@ -417,7 +416,6 @@ func TestWriteEventError(t *testing.T) {
 
 	clock := clock.IntervalClock{Time: time.Now(), Duration: time.Second}
 	eventCorrelator := NewEventCorrelator(&clock)
-	randGen := rand.New(rand.NewSource(time.Now().UnixNano()))
 
 	for caseName, ent := range table {
 		attempts := 0
@@ -431,7 +429,7 @@ func TestWriteEventError(t *testing.T) {
 			},
 		}
 		ev := &v1.Event{}
-		recordToSink(sink, ev, eventCorrelator, randGen, 0)
+		recordToSink(sink, ev, eventCorrelator, 0)
 		if attempts != ent.attemptsWanted {
 			t.Errorf("case %v: wanted %d, got %d attempts", caseName, ent.attemptsWanted, attempts)
 		}
@@ -441,7 +439,6 @@ func TestWriteEventError(t *testing.T) {
 func TestUpdateExpiredEvent(t *testing.T) {
 	clock := clock.IntervalClock{Time: time.Now(), Duration: time.Second}
 	eventCorrelator := NewEventCorrelator(&clock)
-	randGen := rand.New(rand.NewSource(time.Now().UnixNano()))
 
 	var createdEvent *v1.Event
 
@@ -462,7 +459,7 @@ func TestUpdateExpiredEvent(t *testing.T) {
 	ev := &v1.Event{}
 	ev.ResourceVersion = "updated-resource-version"
 	ev.Count = 2
-	recordToSink(sink, ev, eventCorrelator, randGen, 0)
+	recordToSink(sink, ev, eventCorrelator, 0)
 
 	if createdEvent == nil {
 		t.Error("Event did not get created after patch failed")

tools/record/main_test.go

@@ -0,0 +1,29 @@
+/*
+Copyright 2018 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 record
+
+import (
+	"math/rand"
+	"os"
+	"testing"
+	"time"
+)
+
+func TestMain(m *testing.M) {
+	rand.Seed(time.Now().UnixNano())
+	os.Exit(m.Run())
+}