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()) err := s.Start() require.NoError(t, err) t.Cleanup(func() { if err := s.Stop(); err != nil { t.Error(err) } }) 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) err = s.Publish(ctx, "Ivan") assert.NoError(t, err) }() select { case <-published: assertReceive(t, "Quicksilver", subscription.Out()) assertCanceled(t, subscription, pubsub.ErrOutOfCapacity) case <-time.After(3 * time.Second): t.Fatal("Expected Publish(Asylum) not to block") } } func TestSubscribeWithCapacity(t *testing.T) { s := pubsub.NewServer() s.SetLogger(log.TestingLogger()) err := s.Start() require.NoError(t, err) t.Cleanup(func() { if err := s.Stop(); err != nil { t.Error(err) } }) ctx := context.Background() assert.Panics(t, func() { _, err = s.Subscribe(ctx, clientID, query.Empty{}, -1) require.NoError(t, err) }) assert.Panics(t, func() { _, err = s.Subscribe(ctx, clientID, query.Empty{}, 0) require.NoError(t, err) }) 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()) err := s.Start() require.NoError(t, err) t.Cleanup(func() { if err := s.Stop(); err != nil { t.Error(err) } }) 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(3 * time.Second): assertReceive(t, "Ultron", subscription.Out()) assertReceive(t, "Darkhawk", subscription.Out()) } } func TestSlowClientIsRemovedWithErrOutOfCapacity(t *testing.T) { s := pubsub.NewServer() s.SetLogger(log.TestingLogger()) err := s.Start() require.NoError(t, err) t.Cleanup(func() { if err := s.Stop(); err != nil { t.Error(err) } }) 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) assertCanceled(t, subscription, pubsub.ErrOutOfCapacity) } func TestDifferentClients(t *testing.T) { s := pubsub.NewServer() s.SetLogger(log.TestingLogger()) err := s.Start() require.NoError(t, err) t.Cleanup(func() { if err := s.Stop(); err != nil { t.Error(err) } }) ctx := context.Background() subscription1, err := s.Subscribe(ctx, "client-1", query.MustParse("tm.events.type='NewBlock'")) require.NoError(t, err) err = s.PublishWithEvents(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.PublishWithEvents( 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.PublishWithEvents(ctx, "Valeria Richards", map[string][]string{"tm.events.type": {"NewRoundStep"}}) require.NoError(t, err) assert.Zero(t, len(subscription3.Out())) } func TestSubscribeDuplicateKeys(t *testing.T) { ctx := context.Background() s := pubsub.NewServer() s.SetLogger(log.TestingLogger()) require.NoError(t, s.Start()) t.Cleanup(func() { if err := s.Stop(); err != nil { t.Error(err) } }) testCases := []struct { query string expected interface{} }{ { "withdraw.rewards='17'", "Iceman", }, { "withdraw.rewards='22'", "Iceman", }, { "withdraw.rewards='1' AND withdraw.rewards='22'", "Iceman", }, { "withdraw.rewards='100'", nil, }, } for i, tc := range testCases { sub, err := s.Subscribe(ctx, fmt.Sprintf("client-%d", i), query.MustParse(tc.query)) require.NoError(t, err) err = s.PublishWithEvents( ctx, "Iceman", map[string][]string{ "transfer.sender": {"foo", "bar", "baz"}, "withdraw.rewards": {"1", "17", "22"}, }, ) require.NoError(t, err) if tc.expected != nil { assertReceive(t, tc.expected, sub.Out()) } else { require.Zero(t, len(sub.Out())) } } } func TestClientSubscribesTwice(t *testing.T) { s := pubsub.NewServer() s.SetLogger(log.TestingLogger()) err := s.Start() require.NoError(t, err) t.Cleanup(func() { if err := s.Stop(); err != nil { t.Error(err) } }) ctx := context.Background() q := query.MustParse("tm.events.type='NewBlock'") subscription1, err := s.Subscribe(ctx, clientID, q) require.NoError(t, err) err = s.PublishWithEvents(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.PublishWithEvents(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()) err := s.Start() require.NoError(t, err) t.Cleanup(func() { if err := s.Stop(); err != nil { t.Error(err) } }) ctx := context.Background() subscription, err := s.Subscribe(ctx, clientID, query.MustParse("tm.events.type='NewBlock'")) require.NoError(t, err) err = s.Unsubscribe(ctx, pubsub.UnsubscribeArgs{ Subscriber: clientID, Query: 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") assertCanceled(t, subscription, pubsub.ErrUnsubscribed) } func TestClientUnsubscribesTwice(t *testing.T) { s := pubsub.NewServer() s.SetLogger(log.TestingLogger()) err := s.Start() require.NoError(t, err) t.Cleanup(func() { if err := s.Stop(); err != nil { t.Error(err) } }) ctx := context.Background() _, err = s.Subscribe(ctx, clientID, query.MustParse("tm.events.type='NewBlock'")) require.NoError(t, err) err = s.Unsubscribe(ctx, pubsub.UnsubscribeArgs{ Subscriber: clientID, Query: query.MustParse("tm.events.type='NewBlock'")}) require.NoError(t, err) err = s.Unsubscribe(ctx, pubsub.UnsubscribeArgs{ Subscriber: clientID, Query: 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()) err := s.Start() require.NoError(t, err) t.Cleanup(func() { if err := s.Stop(); err != nil { t.Error(err) } }) ctx := context.Background() _, err = s.Subscribe(ctx, clientID, query.Empty{}) require.NoError(t, err) err = s.Unsubscribe(ctx, pubsub.UnsubscribeArgs{Subscriber: clientID, Query: 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()) err := s.Start() require.NoError(t, err) t.Cleanup(func() { if err := s.Stop(); err != nil { t.Error(err) } }) 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") assertCanceled(t, subscription1, pubsub.ErrUnsubscribed) assertCanceled(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() err := s.Start() require.NoError(b, err) b.Cleanup(func() { if err := s.Stop(); err != nil { b.Error(err) } }) 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.Canceled(): return } } }() } b.ReportAllocs() b.ResetTimer() for i := 0; i < b.N; i++ { err = s.PublishWithEvents( ctx, "Gamora", map[string][]string{"abci.Account.Owner": {"Ivan"}, "abci.Invoices.Number": {string(rune(i))}}, ) require.NoError(b, err) } } func benchmarkNClientsOneQuery(n int, b *testing.B) { s := pubsub.NewServer() err := s.Start() require.NoError(b, err) b.Cleanup(func() { if err := s.Stop(); err != nil { b.Error(err) } }) 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.Canceled(): return } } }() } b.ReportAllocs() b.ResetTimer() for i := 0; i < b.N; i++ { err = s.PublishWithEvents(ctx, "Gamora", map[string][]string{"abci.Account.Owner": {"Ivan"}, "abci.Invoices.Number": {"1"}}) require.NoError(b, err) } } // 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 assertCanceled(t *testing.T, subscription *pubsub.Subscription, err error) { _, ok := <-subscription.Canceled() assert.False(t, ok) assert.Equal(t, err, subscription.Err()) }