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tendermint/libs/pubsub/pubsub_test.go

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package pubsub_test
import (
"context"
"fmt"
"runtime/debug"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/tendermint/tendermint/libs/log"
"github.com/tendermint/tendermint/libs/pubsub"
"github.com/tendermint/tendermint/libs/pubsub/query"
)
const (
clientID = "test-client"
)
func TestSubscribe(t *testing.T) {
s := pubsub.NewServer()
s.SetLogger(log.TestingLogger())
s.Start()
defer s.Stop()
ctx := context.Background()
subscription, err := s.Subscribe(ctx, clientID, query.Empty{})
require.NoError(t, err)
assert.Equal(t, 1, s.NumClients())
assert.Equal(t, 1, s.NumClientSubscriptions(clientID))
err = s.Publish(ctx, "Ka-Zar")
require.NoError(t, err)
assertReceive(t, "Ka-Zar", subscription.Out())
published := make(chan struct{})
go func() {
defer close(published)
err := s.Publish(ctx, "Quicksilver")
assert.NoError(t, err)
err = s.Publish(ctx, "Asylum")
assert.NoError(t, err)
}()
select {
case <-published:
assertReceive(t, "Quicksilver", subscription.Out())
assertCancelled(t, subscription, pubsub.ErrOutOfCapacity)
case <-time.After(100 * time.Millisecond):
t.Fatal("Expected Publish(Asylum) not to block")
}
}
func TestSubscribeWithCapacity(t *testing.T) {
s := pubsub.NewServer()
s.SetLogger(log.TestingLogger())
s.Start()
defer s.Stop()
ctx := context.Background()
assert.Panics(t, func() {
s.Subscribe(ctx, clientID, query.Empty{}, -1)
})
assert.Panics(t, func() {
s.Subscribe(ctx, clientID, query.Empty{}, 0)
})
subscription, err := s.Subscribe(ctx, clientID, query.Empty{}, 1)
require.NoError(t, err)
err = s.Publish(ctx, "Aggamon")
require.NoError(t, err)
assertReceive(t, "Aggamon", subscription.Out())
}
func TestSubscribeUnbuffered(t *testing.T) {
s := pubsub.NewServer()
s.SetLogger(log.TestingLogger())
s.Start()
defer s.Stop()
ctx := context.Background()
subscription, err := s.SubscribeUnbuffered(ctx, clientID, query.Empty{})
require.NoError(t, err)
published := make(chan struct{})
go func() {
defer close(published)
err := s.Publish(ctx, "Ultron")
assert.NoError(t, err)
err = s.Publish(ctx, "Darkhawk")
assert.NoError(t, err)
}()
select {
case <-published:
t.Fatal("Expected Publish(Darkhawk) to block")
case <-time.After(100 * time.Millisecond):
assertReceive(t, "Ultron", subscription.Out())
assertReceive(t, "Darkhawk", subscription.Out())
}
}
func TestSlowClientIsRemovedWithErrOutOfCapacity(t *testing.T) {
s := pubsub.NewServer()
s.SetLogger(log.TestingLogger())
s.Start()
defer s.Stop()
ctx := context.Background()
subscription, err := s.Subscribe(ctx, clientID, query.Empty{})
require.NoError(t, err)
err = s.Publish(ctx, "Fat Cobra")
require.NoError(t, err)
err = s.Publish(ctx, "Viper")
require.NoError(t, err)
assertCancelled(t, subscription, pubsub.ErrOutOfCapacity)
}
func TestDifferentClients(t *testing.T) {
s := pubsub.NewServer()
s.SetLogger(log.TestingLogger())
s.Start()
defer s.Stop()
ctx := context.Background()
subscription1, err := s.Subscribe(ctx, "client-1", query.MustParse("tm.events.type='NewBlock'"))
require.NoError(t, err)
err = s.PublishWithTags(ctx, "Iceman", map[string]string{"tm.events.type": "NewBlock"})
require.NoError(t, err)
assertReceive(t, "Iceman", subscription1.Out())
subscription2, err := s.Subscribe(ctx, "client-2", query.MustParse("tm.events.type='NewBlock' AND abci.account.name='Igor'"))
require.NoError(t, err)
err = s.PublishWithTags(ctx, "Ultimo", map[string]string{"tm.events.type": "NewBlock", "abci.account.name": "Igor"})
require.NoError(t, err)
assertReceive(t, "Ultimo", subscription1.Out())
assertReceive(t, "Ultimo", subscription2.Out())
subscription3, err := s.Subscribe(ctx, "client-3", query.MustParse("tm.events.type='NewRoundStep' AND abci.account.name='Igor' AND abci.invoice.number = 10"))
require.NoError(t, err)
err = s.PublishWithTags(ctx, "Valeria Richards", map[string]string{"tm.events.type": "NewRoundStep"})
require.NoError(t, err)
assert.Zero(t, len(subscription3.Out()))
}
func TestClientSubscribesTwice(t *testing.T) {
s := pubsub.NewServer()
s.SetLogger(log.TestingLogger())
s.Start()
defer s.Stop()
ctx := context.Background()
q := query.MustParse("tm.events.type='NewBlock'")
subscription1, err := s.Subscribe(ctx, clientID, q)
require.NoError(t, err)
err = s.PublishWithTags(ctx, "Goblin Queen", map[string]string{"tm.events.type": "NewBlock"})
require.NoError(t, err)
assertReceive(t, "Goblin Queen", subscription1.Out())
subscription2, err := s.Subscribe(ctx, clientID, q)
require.Error(t, err)
require.Nil(t, subscription2)
err = s.PublishWithTags(ctx, "Spider-Man", map[string]string{"tm.events.type": "NewBlock"})
require.NoError(t, err)
assertReceive(t, "Spider-Man", subscription1.Out())
}
func TestUnsubscribe(t *testing.T) {
s := pubsub.NewServer()
s.SetLogger(log.TestingLogger())
s.Start()
defer s.Stop()
ctx := context.Background()
subscription, err := s.Subscribe(ctx, clientID, query.MustParse("tm.events.type='NewBlock'"))
require.NoError(t, err)
err = s.Unsubscribe(ctx, clientID, query.MustParse("tm.events.type='NewBlock'"))
require.NoError(t, err)
err = s.Publish(ctx, "Nick Fury")
require.NoError(t, err)
assert.Zero(t, len(subscription.Out()), "Should not receive anything after Unsubscribe")
assertCancelled(t, subscription, pubsub.ErrUnsubscribed)
}
func TestClientUnsubscribesTwice(t *testing.T) {
s := pubsub.NewServer()
s.SetLogger(log.TestingLogger())
s.Start()
defer s.Stop()
ctx := context.Background()
_, err := s.Subscribe(ctx, clientID, query.MustParse("tm.events.type='NewBlock'"))
require.NoError(t, err)
err = s.Unsubscribe(ctx, clientID, query.MustParse("tm.events.type='NewBlock'"))
require.NoError(t, err)
err = s.Unsubscribe(ctx, clientID, query.MustParse("tm.events.type='NewBlock'"))
assert.Equal(t, pubsub.ErrSubscriptionNotFound, err)
err = s.UnsubscribeAll(ctx, clientID)
assert.Equal(t, pubsub.ErrSubscriptionNotFound, err)
}
func TestResubscribe(t *testing.T) {
s := pubsub.NewServer()
s.SetLogger(log.TestingLogger())
s.Start()
defer s.Stop()
ctx := context.Background()
subscription, err := s.Subscribe(ctx, clientID, query.Empty{})
require.NoError(t, err)
err = s.Unsubscribe(ctx, clientID, query.Empty{})
require.NoError(t, err)
subscription, err = s.Subscribe(ctx, clientID, query.Empty{})
require.NoError(t, err)
err = s.Publish(ctx, "Cable")
require.NoError(t, err)
assertReceive(t, "Cable", subscription.Out())
}
func TestUnsubscribeAll(t *testing.T) {
s := pubsub.NewServer()
s.SetLogger(log.TestingLogger())
s.Start()
defer s.Stop()
ctx := context.Background()
subscription1, err := s.Subscribe(ctx, clientID, query.MustParse("tm.events.type='NewBlock'"))
require.NoError(t, err)
subscription2, err := s.Subscribe(ctx, clientID, query.MustParse("tm.events.type='NewBlockHeader'"))
require.NoError(t, err)
err = s.UnsubscribeAll(ctx, clientID)
require.NoError(t, err)
err = s.Publish(ctx, "Nick Fury")
require.NoError(t, err)
assert.Zero(t, len(subscription1.Out()), "Should not receive anything after UnsubscribeAll")
assert.Zero(t, len(subscription2.Out()), "Should not receive anything after UnsubscribeAll")
assertCancelled(t, subscription1, pubsub.ErrUnsubscribed)
assertCancelled(t, subscription2, pubsub.ErrUnsubscribed)
}
func TestBufferCapacity(t *testing.T) {
s := pubsub.NewServer(pubsub.BufferCapacity(2))
s.SetLogger(log.TestingLogger())
assert.Equal(t, 2, s.BufferCapacity())
ctx := context.Background()
err := s.Publish(ctx, "Nighthawk")
require.NoError(t, err)
err = s.Publish(ctx, "Sage")
require.NoError(t, err)
ctx, cancel := context.WithTimeout(ctx, 10*time.Millisecond)
defer cancel()
err = s.Publish(ctx, "Ironclad")
if assert.Error(t, err) {
assert.Equal(t, context.DeadlineExceeded, err)
}
}
func Benchmark10Clients(b *testing.B) { benchmarkNClients(10, b) }
func Benchmark100Clients(b *testing.B) { benchmarkNClients(100, b) }
func Benchmark1000Clients(b *testing.B) { benchmarkNClients(1000, b) }
func Benchmark10ClientsOneQuery(b *testing.B) { benchmarkNClientsOneQuery(10, b) }
func Benchmark100ClientsOneQuery(b *testing.B) { benchmarkNClientsOneQuery(100, b) }
func Benchmark1000ClientsOneQuery(b *testing.B) { benchmarkNClientsOneQuery(1000, b) }
func benchmarkNClients(n int, b *testing.B) {
s := pubsub.NewServer()
s.Start()
defer s.Stop()
ctx := context.Background()
for i := 0; i < n; i++ {
subscription, err := s.Subscribe(ctx, clientID, query.MustParse(fmt.Sprintf("abci.Account.Owner = 'Ivan' AND abci.Invoices.Number = %d", i)))
if err != nil {
b.Fatal(err)
}
go func() {
for {
select {
case <-subscription.Out():
continue
case <-subscription.Cancelled():
return
}
}
}()
}
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
s.PublishWithTags(ctx, "Gamora", map[string]string{"abci.Account.Owner": "Ivan", "abci.Invoices.Number": string(i)})
}
}
func benchmarkNClientsOneQuery(n int, b *testing.B) {
s := pubsub.NewServer()
s.Start()
defer s.Stop()
ctx := context.Background()
q := query.MustParse("abci.Account.Owner = 'Ivan' AND abci.Invoices.Number = 1")
for i := 0; i < n; i++ {
subscription, err := s.Subscribe(ctx, clientID, q)
if err != nil {
b.Fatal(err)
}
go func() {
for {
select {
case <-subscription.Out():
continue
case <-subscription.Cancelled():
return
}
}
}()
}
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
s.PublishWithTags(ctx, "Gamora", map[string]string{"abci.Account.Owner": "Ivan", "abci.Invoices.Number": "1"})
}
}
///////////////////////////////////////////////////////////////////////////////
/// HELPERS
///////////////////////////////////////////////////////////////////////////////
func assertReceive(t *testing.T, expected interface{}, ch <-chan pubsub.Message, msgAndArgs ...interface{}) {
select {
case actual := <-ch:
assert.Equal(t, expected, actual.Data(), msgAndArgs...)
case <-time.After(1 * time.Second):
t.Errorf("Expected to receive %v from the channel, got nothing after 1s", expected)
debug.PrintStack()
}
}
func assertCancelled(t *testing.T, subscription *pubsub.Subscription, err error) {
_, ok := <-subscription.Cancelled()
assert.False(t, ok)
assert.Equal(t, err, subscription.Err())
}