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package events
import (
"context"
"fmt"
"math/rand"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/tendermint/tendermint/libs/log"
)
// TestAddListenerForEventFireOnce sets up an EventSwitch, subscribes a single
// listener to an event, and sends a string "data".
func TestAddListenerForEventFireOnce(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
evsw := NewEventSwitch(log.TestingLogger())
require.NoError(t, evsw.Start(ctx))
t.Cleanup(evsw.Wait)
messages := make(chan EventData)
require.NoError(t, evsw.AddListenerForEvent("listener", "event",
func(ctx context.Context, data EventData) error {
// test there's no deadlock if we remove the listener inside a callback
evsw.RemoveListener("listener")
select {
case messages <- data:
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
go evsw.FireEvent(ctx, "event", "data")
received := <-messages
if received != "data" {
t.Errorf("message received does not match: %v", received)
}
}
// TestAddListenerForEventFireMany sets up an EventSwitch, subscribes a single
// listener to an event, and sends a thousand integers.
func TestAddListenerForEventFireMany(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
evsw := NewEventSwitch(log.TestingLogger())
require.NoError(t, evsw.Start(ctx))
t.Cleanup(evsw.Wait)
doneSum := make(chan uint64)
doneSending := make(chan uint64)
numbers := make(chan uint64, 4)
// subscribe one listener for one event
require.NoError(t, evsw.AddListenerForEvent("listener", "event",
func(ctx context.Context, data EventData) error {
select {
case numbers <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
// collect received events
go sumReceivedNumbers(numbers, doneSum)
// go fire events
go fireEvents(ctx, evsw, "event", doneSending, uint64(1))
checkSum := <-doneSending
close(numbers)
eventSum := <-doneSum
if checkSum != eventSum {
t.Errorf("not all messages sent were received.\n")
}
}
// TestAddListenerForDifferentEvents sets up an EventSwitch, subscribes a single
// listener to three different events and sends a thousand integers for each
// of the three events.
func TestAddListenerForDifferentEvents(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
evsw := NewEventSwitch(log.TestingLogger())
require.NoError(t, evsw.Start(ctx))
t.Cleanup(evsw.Wait)
doneSum := make(chan uint64)
doneSending1 := make(chan uint64)
doneSending2 := make(chan uint64)
doneSending3 := make(chan uint64)
numbers := make(chan uint64, 4)
// subscribe one listener to three events
require.NoError(t, evsw.AddListenerForEvent("listener", "event1",
func(ctx context.Context, data EventData) error {
select {
case numbers <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
require.NoError(t, evsw.AddListenerForEvent("listener", "event2",
func(ctx context.Context, data EventData) error {
select {
case numbers <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
require.NoError(t, evsw.AddListenerForEvent("listener", "event3",
func(ctx context.Context, data EventData) error {
select {
case numbers <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
// collect received events
go sumReceivedNumbers(numbers, doneSum)
// go fire events
go fireEvents(ctx, evsw, "event1", doneSending1, uint64(1))
go fireEvents(ctx, evsw, "event2", doneSending2, uint64(1))
go fireEvents(ctx, evsw, "event3", doneSending3, uint64(1))
var checkSum uint64
checkSum += <-doneSending1
checkSum += <-doneSending2
checkSum += <-doneSending3
close(numbers)
eventSum := <-doneSum
if checkSum != eventSum {
t.Errorf("not all messages sent were received.\n")
}
}
// TestAddDifferentListenerForDifferentEvents sets up an EventSwitch,
// subscribes a first listener to three events, and subscribes a second
// listener to two of those three events, and then sends a thousand integers
// for each of the three events.
func TestAddDifferentListenerForDifferentEvents(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
evsw := NewEventSwitch(log.TestingLogger())
require.NoError(t, evsw.Start(ctx))
t.Cleanup(evsw.Wait)
doneSum1 := make(chan uint64)
doneSum2 := make(chan uint64)
doneSending1 := make(chan uint64)
doneSending2 := make(chan uint64)
doneSending3 := make(chan uint64)
numbers1 := make(chan uint64, 4)
numbers2 := make(chan uint64, 4)
// subscribe two listener to three events
require.NoError(t, evsw.AddListenerForEvent("listener1", "event1",
func(ctx context.Context, data EventData) error {
select {
case numbers1 <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
require.NoError(t, evsw.AddListenerForEvent("listener1", "event2",
func(ctx context.Context, data EventData) error {
select {
case numbers1 <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
require.NoError(t, evsw.AddListenerForEvent("listener1", "event3",
func(ctx context.Context, data EventData) error {
select {
case numbers1 <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
require.NoError(t, evsw.AddListenerForEvent("listener2", "event2",
func(ctx context.Context, data EventData) error {
select {
case numbers2 <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
require.NoError(t, evsw.AddListenerForEvent("listener2", "event3",
func(ctx context.Context, data EventData) error {
select {
case numbers2 <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
// collect received events for listener1
go sumReceivedNumbers(numbers1, doneSum1)
// collect received events for listener2
go sumReceivedNumbers(numbers2, doneSum2)
// go fire events
go fireEvents(ctx, evsw, "event1", doneSending1, uint64(1))
go fireEvents(ctx, evsw, "event2", doneSending2, uint64(1001))
go fireEvents(ctx, evsw, "event3", doneSending3, uint64(2001))
checkSumEvent1 := <-doneSending1
checkSumEvent2 := <-doneSending2
checkSumEvent3 := <-doneSending3
checkSum1 := checkSumEvent1 + checkSumEvent2 + checkSumEvent3
checkSum2 := checkSumEvent2 + checkSumEvent3
close(numbers1)
close(numbers2)
eventSum1 := <-doneSum1
eventSum2 := <-doneSum2
if checkSum1 != eventSum1 ||
checkSum2 != eventSum2 {
t.Errorf("not all messages sent were received for different listeners to different events.\n")
}
}
func TestAddAndRemoveListenerConcurrency(t *testing.T) {
var (
stopInputEvent = false
roundCount = 2000
)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
evsw := NewEventSwitch(log.TestingLogger())
require.NoError(t, evsw.Start(ctx))
t.Cleanup(evsw.Wait)
done1 := make(chan struct{})
done2 := make(chan struct{})
// Must be executed concurrently to uncover the data race.
// 1. RemoveListener
go func() {
defer close(done1)
for i := 0; i < roundCount; i++ {
evsw.RemoveListener("listener")
}
}()
// 2. AddListenerForEvent
go func() {
defer close(done2)
for i := 0; i < roundCount; i++ {
index := i
// we explicitly ignore errors here, since the listener will sometimes be removed
// (that's what we're testing)
_ = evsw.AddListenerForEvent("listener", fmt.Sprintf("event%d", index),
func(ctx context.Context, data EventData) error {
t.Errorf("should not run callback for %d.\n", index)
stopInputEvent = true
return nil
})
}
}()
<-done1
<-done2
evsw.RemoveListener("listener") // remove the last listener
for i := 0; i < roundCount && !stopInputEvent; i++ {
evsw.FireEvent(ctx, fmt.Sprintf("event%d", i), uint64(1001))
}
}
// TestAddAndRemoveListener sets up an EventSwitch, subscribes a listener to
// two events, fires a thousand integers for the first event, then unsubscribes
// the listener and fires a thousand integers for the second event.
func TestAddAndRemoveListener(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
evsw := NewEventSwitch(log.TestingLogger())
require.NoError(t, evsw.Start(ctx))
t.Cleanup(evsw.Wait)
doneSum1 := make(chan uint64)
doneSum2 := make(chan uint64)
doneSending1 := make(chan uint64)
doneSending2 := make(chan uint64)
numbers1 := make(chan uint64, 4)
numbers2 := make(chan uint64, 4)
// subscribe two listener to three events
require.NoError(t, evsw.AddListenerForEvent("listener", "event1",
func(ctx context.Context, data EventData) error {
select {
case numbers1 <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
require.NoError(t, evsw.AddListenerForEvent("listener", "event2",
func(ctx context.Context, data EventData) error {
select {
case numbers2 <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
// collect received events for event1
go sumReceivedNumbers(numbers1, doneSum1)
// collect received events for event2
go sumReceivedNumbers(numbers2, doneSum2)
// go fire events
go fireEvents(ctx, evsw, "event1", doneSending1, uint64(1))
checkSumEvent1 := <-doneSending1
// after sending all event1, unsubscribe for all events
evsw.RemoveListener("listener")
go fireEvents(ctx, evsw, "event2", doneSending2, uint64(1001))
checkSumEvent2 := <-doneSending2
close(numbers1)
close(numbers2)
eventSum1 := <-doneSum1
eventSum2 := <-doneSum2
if checkSumEvent1 != eventSum1 ||
// correct value asserted by preceding tests, suffices to be non-zero
checkSumEvent2 == uint64(0) ||
eventSum2 != uint64(0) {
t.Errorf("not all messages sent were received or unsubscription did not register.\n")
}
}
// TestRemoveListener does basic tests on adding and removing
func TestRemoveListener(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
evsw := NewEventSwitch(log.TestingLogger())
require.NoError(t, evsw.Start(ctx))
t.Cleanup(evsw.Wait)
count := 10
sum1, sum2 := 0, 0
// add some listeners and make sure they work
require.NoError(t, evsw.AddListenerForEvent("listener", "event1",
func(ctx context.Context, data EventData) error {
sum1++
return nil
}))
require.NoError(t, evsw.AddListenerForEvent("listener", "event2",
func(ctx context.Context, data EventData) error {
sum2++
return nil
}))
for i := 0; i < count; i++ {
evsw.FireEvent(ctx, "event1", true)
evsw.FireEvent(ctx, "event2", true)
}
assert.Equal(t, count, sum1)
assert.Equal(t, count, sum2)
// remove one by event and make sure it is gone
evsw.RemoveListenerForEvent("event2", "listener")
for i := 0; i < count; i++ {
evsw.FireEvent(ctx, "event1", true)
evsw.FireEvent(ctx, "event2", true)
}
assert.Equal(t, count*2, sum1)
assert.Equal(t, count, sum2)
// remove the listener entirely and make sure both gone
evsw.RemoveListener("listener")
for i := 0; i < count; i++ {
evsw.FireEvent(ctx, "event1", true)
evsw.FireEvent(ctx, "event2", true)
}
assert.Equal(t, count*2, sum1)
assert.Equal(t, count, sum2)
}
// TestAddAndRemoveListenersAsync sets up an EventSwitch, subscribes two
// listeners to three events, and fires a thousand integers for each event.
// These two listeners serve as the baseline validation while other listeners
// are randomly subscribed and unsubscribed.
// More precisely it randomly subscribes new listeners (different from the first
// two listeners) to one of these three events. At the same time it starts
// randomly unsubscribing these additional listeners from all events they are
// at that point subscribed to.
// NOTE: it is important to run this test with race conditions tracking on,
// `go test -race`, to examine for possible race conditions.
func TestRemoveListenersAsync(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
evsw := NewEventSwitch(log.TestingLogger())
require.NoError(t, evsw.Start(ctx))
t.Cleanup(evsw.Wait)
doneSum1 := make(chan uint64)
doneSum2 := make(chan uint64)
doneSending1 := make(chan uint64)
doneSending2 := make(chan uint64)
doneSending3 := make(chan uint64)
numbers1 := make(chan uint64, 4)
numbers2 := make(chan uint64, 4)
// subscribe two listener to three events
require.NoError(t, evsw.AddListenerForEvent("listener1", "event1",
func(ctx context.Context, data EventData) error {
select {
case numbers1 <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
require.NoError(t, evsw.AddListenerForEvent("listener1", "event2",
func(ctx context.Context, data EventData) error {
select {
case numbers1 <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
require.NoError(t, evsw.AddListenerForEvent("listener1", "event3",
func(ctx context.Context, data EventData) error {
select {
case numbers1 <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
require.NoError(t, evsw.AddListenerForEvent("listener2", "event1",
func(ctx context.Context, data EventData) error {
select {
case numbers2 <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
require.NoError(t, evsw.AddListenerForEvent("listener2", "event2",
func(ctx context.Context, data EventData) error {
select {
case numbers2 <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
require.NoError(t, evsw.AddListenerForEvent("listener2", "event3",
func(ctx context.Context, data EventData) error {
select {
case numbers2 <- data.(uint64):
return nil
case <-ctx.Done():
return ctx.Err()
}
}))
// collect received events for event1
go sumReceivedNumbers(numbers1, doneSum1)
// collect received events for event2
go sumReceivedNumbers(numbers2, doneSum2)
addListenersStress := func() {
r1 := rand.New(rand.NewSource(time.Now().Unix()))
r1.Seed(time.Now().UnixNano())
for k := uint16(0); k < 400; k++ {
listenerNumber := r1.Intn(100) + 3
eventNumber := r1.Intn(3) + 1
go evsw.AddListenerForEvent(fmt.Sprintf("listener%v", listenerNumber), //nolint:errcheck // ignore for tests
fmt.Sprintf("event%v", eventNumber),
func(context.Context, EventData) error { return nil })
}
}
removeListenersStress := func() {
r2 := rand.New(rand.NewSource(time.Now().Unix()))
r2.Seed(time.Now().UnixNano())
for k := uint16(0); k < 80; k++ {
listenerNumber := r2.Intn(100) + 3
go evsw.RemoveListener(fmt.Sprintf("listener%v", listenerNumber))
}
}
addListenersStress()
// go fire events
go fireEvents(ctx, evsw, "event1", doneSending1, uint64(1))
removeListenersStress()
go fireEvents(ctx, evsw, "event2", doneSending2, uint64(1001))
go fireEvents(ctx, evsw, "event3", doneSending3, uint64(2001))
checkSumEvent1 := <-doneSending1
checkSumEvent2 := <-doneSending2
checkSumEvent3 := <-doneSending3
checkSum := checkSumEvent1 + checkSumEvent2 + checkSumEvent3
close(numbers1)
close(numbers2)
eventSum1 := <-doneSum1
eventSum2 := <-doneSum2
if checkSum != eventSum1 ||
checkSum != eventSum2 {
t.Errorf("not all messages sent were received.\n")
}
}
//------------------------------------------------------------------------------
// Helper functions
// sumReceivedNumbers takes two channels and adds all numbers received
// until the receiving channel `numbers` is closed; it then sends the sum
// on `doneSum` and closes that channel. Expected to be run in a go-routine.
func sumReceivedNumbers(numbers, doneSum chan uint64) {
var sum uint64
for {
j, more := <-numbers
sum += j
if !more {
doneSum <- sum
close(doneSum)
return
}
}
}
// fireEvents takes an EventSwitch and fires a thousand integers under
// a given `event` with the integers mootonically increasing from `offset`
// to `offset` + 999. It additionally returns the addition of all integers
// sent on `doneChan` for assertion that all events have been sent, and enabling
// the test to assert all events have also been received.
func fireEvents(ctx context.Context, evsw Fireable, event string, doneChan chan uint64, offset uint64) {
defer close(doneChan)
var sentSum uint64
for i := offset; i <= offset+uint64(999); i++ {
if ctx.Err() != nil {
break
}
evsw.FireEvent(ctx, event, i)
sentSum += i
}
select {
case <-ctx.Done():
case doneChan <- sentSum:
}
}