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|
package pubsub
import (
"fmt"
"testing"
"time"
)
func TestSendToOneSub(t *testing.T) {
p := NewPublisher(100*time.Millisecond, 10)
c := p.Subscribe()
p.Publish("hi")
msg := <-c
if msg.(string) != "hi" {
t.Fatalf("expected message hi but received %v", msg)
}
}
func TestSendToMultipleSubs(t *testing.T) {
p := NewPublisher(100*time.Millisecond, 10)
var subs []chan interface{}
subs = append(subs, p.Subscribe(), p.Subscribe(), p.Subscribe())
p.Publish("hi")
for _, c := range subs {
msg := <-c
if msg.(string) != "hi" {
t.Fatalf("expected message hi but received %v", msg)
}
}
}
func TestEvictOneSub(t *testing.T) {
p := NewPublisher(100*time.Millisecond, 10)
s1 := p.Subscribe()
s2 := p.Subscribe()
p.Evict(s1)
p.Publish("hi")
if _, ok := <-s1; ok {
t.Fatal("expected s1 to not receive the published message")
}
msg := <-s2
if msg.(string) != "hi" {
t.Fatalf("expected message hi but received %v", msg)
}
}
func TestClosePublisher(t *testing.T) {
p := NewPublisher(100*time.Millisecond, 10)
var subs []chan interface{}
subs = append(subs, p.Subscribe(), p.Subscribe(), p.Subscribe())
p.Close()
for _, c := range subs {
if _, ok := <-c; ok {
t.Fatal("expected all subscriber channels to be closed")
}
}
}
const sampleText = "test"
type testSubscriber struct {
dataCh chan interface{}
ch chan error
}
func (s *testSubscriber) Wait() error {
return <-s.ch
}
func newTestSubscriber(p *Publisher) *testSubscriber {
ts := &testSubscriber{
dataCh: p.Subscribe(),
ch: make(chan error),
}
go func() {
for data := range ts.dataCh {
s, ok := data.(string)
if !ok {
ts.ch <- fmt.Errorf("Unexpected type %T", data)
break
}
if s != sampleText {
ts.ch <- fmt.Errorf("Unexpected text %s", s)
break
}
}
close(ts.ch)
}()
return ts
}
// for testing with -race
func TestPubSubRace(t *testing.T) {
p := NewPublisher(0, 1024)
var subs []*testSubscriber
for j := 0; j < 50; j++ {
subs = append(subs, newTestSubscriber(p))
}
for j := 0; j < 1000; j++ {
p.Publish(sampleText)
}
time.AfterFunc(1*time.Second, func() {
for _, s := range subs {
p.Evict(s.dataCh)
}
})
for _, s := range subs {
_ = s.Wait()
}
}
func BenchmarkPubSub(b *testing.B) {
for i := 0; i < b.N; i++ {
b.StopTimer()
p := NewPublisher(0, 1024)
var subs []*testSubscriber
for j := 0; j < 50; j++ {
subs = append(subs, newTestSubscriber(p))
}
b.StartTimer()
for j := 0; j < 1000; j++ {
p.Publish(sampleText)
}
time.AfterFunc(1*time.Second, func() {
for _, s := range subs {
p.Evict(s.dataCh)
}
})
for _, s := range subs {
if err := s.Wait(); err != nil {
b.Fatal(err)
}
}
}
}
|
