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380 lines
12 KiB
380 lines
12 KiB
package events
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import (
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"fmt"
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"math/rand"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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)
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// TestAddListenerForEventFireOnce sets up an EventSwitch, subscribes a single
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// listener to an event, and sends a string "data".
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func TestAddListenerForEventFireOnce(t *testing.T) {
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evsw := NewEventSwitch()
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err := evsw.Start()
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if err != nil {
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t.Errorf("Failed to start EventSwitch, error: %v", err)
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}
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messages := make(chan EventData)
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evsw.AddListenerForEvent("listener", "event",
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func(data EventData) {
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messages <- data
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})
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go evsw.FireEvent("event", "data")
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received := <-messages
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if received != "data" {
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t.Errorf("Message received does not match: %v", received)
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}
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}
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// TestAddListenerForEventFireMany sets up an EventSwitch, subscribes a single
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// listener to an event, and sends a thousand integers.
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func TestAddListenerForEventFireMany(t *testing.T) {
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evsw := NewEventSwitch()
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err := evsw.Start()
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if err != nil {
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t.Errorf("Failed to start EventSwitch, error: %v", err)
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}
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doneSum := make(chan uint64)
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doneSending := make(chan uint64)
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numbers := make(chan uint64, 4)
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// subscribe one listener for one event
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evsw.AddListenerForEvent("listener", "event",
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func(data EventData) {
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numbers <- data.(uint64)
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})
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// collect received events
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go sumReceivedNumbers(numbers, doneSum)
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// go fire events
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go fireEvents(evsw, "event", doneSending, uint64(1))
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checkSum := <-doneSending
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close(numbers)
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eventSum := <-doneSum
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if checkSum != eventSum {
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t.Errorf("Not all messages sent were received.\n")
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}
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}
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// TestAddListenerForDifferentEvents sets up an EventSwitch, subscribes a single
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// listener to three different events and sends a thousand integers for each
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// of the three events.
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func TestAddListenerForDifferentEvents(t *testing.T) {
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evsw := NewEventSwitch()
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err := evsw.Start()
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if err != nil {
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t.Errorf("Failed to start EventSwitch, error: %v", err)
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}
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doneSum := make(chan uint64)
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doneSending1 := make(chan uint64)
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doneSending2 := make(chan uint64)
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doneSending3 := make(chan uint64)
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numbers := make(chan uint64, 4)
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// subscribe one listener to three events
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evsw.AddListenerForEvent("listener", "event1",
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func(data EventData) {
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numbers <- data.(uint64)
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})
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evsw.AddListenerForEvent("listener", "event2",
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func(data EventData) {
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numbers <- data.(uint64)
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})
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evsw.AddListenerForEvent("listener", "event3",
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func(data EventData) {
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numbers <- data.(uint64)
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})
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// collect received events
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go sumReceivedNumbers(numbers, doneSum)
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// go fire events
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go fireEvents(evsw, "event1", doneSending1, uint64(1))
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go fireEvents(evsw, "event2", doneSending2, uint64(1))
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go fireEvents(evsw, "event3", doneSending3, uint64(1))
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var checkSum uint64 = 0
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checkSum += <-doneSending1
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checkSum += <-doneSending2
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checkSum += <-doneSending3
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close(numbers)
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eventSum := <-doneSum
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if checkSum != eventSum {
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t.Errorf("Not all messages sent were received.\n")
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}
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}
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// TestAddDifferentListenerForDifferentEvents sets up an EventSwitch,
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// subscribes a first listener to three events, and subscribes a second
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// listener to two of those three events, and then sends a thousand integers
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// for each of the three events.
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func TestAddDifferentListenerForDifferentEvents(t *testing.T) {
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evsw := NewEventSwitch()
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err := evsw.Start()
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if err != nil {
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t.Errorf("Failed to start EventSwitch, error: %v", err)
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}
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doneSum1 := make(chan uint64)
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doneSum2 := make(chan uint64)
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doneSending1 := make(chan uint64)
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doneSending2 := make(chan uint64)
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doneSending3 := make(chan uint64)
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numbers1 := make(chan uint64, 4)
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numbers2 := make(chan uint64, 4)
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// subscribe two listener to three events
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evsw.AddListenerForEvent("listener1", "event1",
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func(data EventData) {
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numbers1 <- data.(uint64)
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})
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evsw.AddListenerForEvent("listener1", "event2",
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func(data EventData) {
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numbers1 <- data.(uint64)
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})
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evsw.AddListenerForEvent("listener1", "event3",
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func(data EventData) {
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numbers1 <- data.(uint64)
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})
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evsw.AddListenerForEvent("listener2", "event2",
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func(data EventData) {
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numbers2 <- data.(uint64)
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})
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evsw.AddListenerForEvent("listener2", "event3",
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func(data EventData) {
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numbers2 <- data.(uint64)
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})
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// collect received events for listener1
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go sumReceivedNumbers(numbers1, doneSum1)
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// collect received events for listener2
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go sumReceivedNumbers(numbers2, doneSum2)
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// go fire events
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go fireEvents(evsw, "event1", doneSending1, uint64(1))
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go fireEvents(evsw, "event2", doneSending2, uint64(1001))
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go fireEvents(evsw, "event3", doneSending3, uint64(2001))
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checkSumEvent1 := <-doneSending1
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checkSumEvent2 := <-doneSending2
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checkSumEvent3 := <-doneSending3
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checkSum1 := checkSumEvent1 + checkSumEvent2 + checkSumEvent3
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checkSum2 := checkSumEvent2 + checkSumEvent3
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close(numbers1)
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close(numbers2)
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eventSum1 := <-doneSum1
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eventSum2 := <-doneSum2
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if checkSum1 != eventSum1 ||
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checkSum2 != eventSum2 {
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t.Errorf("Not all messages sent were received for different listeners to different events.\n")
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}
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}
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// TestAddAndRemoveListener sets up an EventSwitch, subscribes a listener to
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// two events, fires a thousand integers for the first event, then unsubscribes
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// the listener and fires a thousand integers for the second event.
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func TestAddAndRemoveListener(t *testing.T) {
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evsw := NewEventSwitch()
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err := evsw.Start()
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if err != nil {
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t.Errorf("Failed to start EventSwitch, error: %v", err)
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}
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doneSum1 := make(chan uint64)
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doneSum2 := make(chan uint64)
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doneSending1 := make(chan uint64)
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doneSending2 := make(chan uint64)
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numbers1 := make(chan uint64, 4)
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numbers2 := make(chan uint64, 4)
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// subscribe two listener to three events
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evsw.AddListenerForEvent("listener", "event1",
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func(data EventData) {
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numbers1 <- data.(uint64)
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})
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evsw.AddListenerForEvent("listener", "event2",
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func(data EventData) {
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numbers2 <- data.(uint64)
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})
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// collect received events for event1
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go sumReceivedNumbers(numbers1, doneSum1)
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// collect received events for event2
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go sumReceivedNumbers(numbers2, doneSum2)
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// go fire events
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go fireEvents(evsw, "event1", doneSending1, uint64(1))
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checkSumEvent1 := <-doneSending1
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// after sending all event1, unsubscribe for all events
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evsw.RemoveListener("listener")
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go fireEvents(evsw, "event2", doneSending2, uint64(1001))
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checkSumEvent2 := <-doneSending2
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close(numbers1)
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close(numbers2)
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eventSum1 := <-doneSum1
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eventSum2 := <-doneSum2
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if checkSumEvent1 != eventSum1 ||
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// correct value asserted by preceding tests, suffices to be non-zero
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checkSumEvent2 == uint64(0) ||
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eventSum2 != uint64(0) {
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t.Errorf("Not all messages sent were received or unsubscription did not register.\n")
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}
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}
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// TestRemoveListener does basic tests on adding and removing
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func TestRemoveListener(t *testing.T) {
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evsw := NewEventSwitch()
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err := evsw.Start()
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if err != nil {
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t.Errorf("Failed to start EventSwitch, error: %v", err)
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}
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count := 10
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sum1, sum2 := 0, 0
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// add some listeners and make sure they work
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evsw.AddListenerForEvent("listener", "event1",
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func(data EventData) {
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sum1++
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})
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evsw.AddListenerForEvent("listener", "event2",
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func(data EventData) {
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sum2++
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})
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for i := 0; i < count; i++ {
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evsw.FireEvent("event1", true)
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evsw.FireEvent("event2", true)
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}
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assert.Equal(t, count, sum1)
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assert.Equal(t, count, sum2)
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// remove one by event and make sure it is gone
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evsw.RemoveListenerForEvent("event2", "listener")
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for i := 0; i < count; i++ {
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evsw.FireEvent("event1", true)
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evsw.FireEvent("event2", true)
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}
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assert.Equal(t, count*2, sum1)
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assert.Equal(t, count, sum2)
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// remove the listener entirely and make sure both gone
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evsw.RemoveListener("listener")
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for i := 0; i < count; i++ {
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evsw.FireEvent("event1", true)
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evsw.FireEvent("event2", true)
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}
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assert.Equal(t, count*2, sum1)
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assert.Equal(t, count, sum2)
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}
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// TestAddAndRemoveListenersAsync sets up an EventSwitch, subscribes two
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// listeners to three events, and fires a thousand integers for each event.
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// These two listeners serve as the baseline validation while other listeners
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// are randomly subscribed and unsubscribed.
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// More precisely it randomly subscribes new listeners (different from the first
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// two listeners) to one of these three events. At the same time it starts
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// randomly unsubscribing these additional listeners from all events they are
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// at that point subscribed to.
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// NOTE: it is important to run this test with race conditions tracking on,
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// `go test -race`, to examine for possible race conditions.
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func TestRemoveListenersAsync(t *testing.T) {
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evsw := NewEventSwitch()
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err := evsw.Start()
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if err != nil {
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t.Errorf("Failed to start EventSwitch, error: %v", err)
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}
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doneSum1 := make(chan uint64)
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doneSum2 := make(chan uint64)
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doneSending1 := make(chan uint64)
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doneSending2 := make(chan uint64)
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doneSending3 := make(chan uint64)
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numbers1 := make(chan uint64, 4)
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numbers2 := make(chan uint64, 4)
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// subscribe two listener to three events
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evsw.AddListenerForEvent("listener1", "event1",
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func(data EventData) {
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numbers1 <- data.(uint64)
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})
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evsw.AddListenerForEvent("listener1", "event2",
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func(data EventData) {
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numbers1 <- data.(uint64)
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})
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evsw.AddListenerForEvent("listener1", "event3",
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func(data EventData) {
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numbers1 <- data.(uint64)
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})
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evsw.AddListenerForEvent("listener2", "event1",
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func(data EventData) {
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numbers2 <- data.(uint64)
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})
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evsw.AddListenerForEvent("listener2", "event2",
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func(data EventData) {
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numbers2 <- data.(uint64)
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})
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evsw.AddListenerForEvent("listener2", "event3",
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func(data EventData) {
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numbers2 <- data.(uint64)
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})
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// collect received events for event1
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go sumReceivedNumbers(numbers1, doneSum1)
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// collect received events for event2
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go sumReceivedNumbers(numbers2, doneSum2)
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addListenersStress := func() {
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s1 := rand.NewSource(time.Now().UnixNano())
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r1 := rand.New(s1)
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for k := uint16(0); k < 400; k++ {
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listenerNumber := r1.Intn(100) + 3
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eventNumber := r1.Intn(3) + 1
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go evsw.AddListenerForEvent(fmt.Sprintf("listener%v", listenerNumber),
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fmt.Sprintf("event%v", eventNumber),
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func(_ EventData) {})
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}
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}
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removeListenersStress := func() {
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s2 := rand.NewSource(time.Now().UnixNano())
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r2 := rand.New(s2)
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for k := uint16(0); k < 80; k++ {
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listenerNumber := r2.Intn(100) + 3
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go evsw.RemoveListener(fmt.Sprintf("listener%v", listenerNumber))
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}
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}
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addListenersStress()
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// go fire events
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go fireEvents(evsw, "event1", doneSending1, uint64(1))
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removeListenersStress()
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go fireEvents(evsw, "event2", doneSending2, uint64(1001))
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go fireEvents(evsw, "event3", doneSending3, uint64(2001))
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checkSumEvent1 := <-doneSending1
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checkSumEvent2 := <-doneSending2
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checkSumEvent3 := <-doneSending3
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checkSum := checkSumEvent1 + checkSumEvent2 + checkSumEvent3
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close(numbers1)
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close(numbers2)
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eventSum1 := <-doneSum1
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eventSum2 := <-doneSum2
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if checkSum != eventSum1 ||
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checkSum != eventSum2 {
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t.Errorf("Not all messages sent were received.\n")
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}
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}
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//------------------------------------------------------------------------------
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// Helper functions
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// sumReceivedNumbers takes two channels and adds all numbers received
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// until the receiving channel `numbers` is closed; it then sends the sum
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// on `doneSum` and closes that channel. Expected to be run in a go-routine.
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func sumReceivedNumbers(numbers, doneSum chan uint64) {
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var sum uint64 = 0
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for {
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j, more := <-numbers
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sum += j
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if !more {
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doneSum <- sum
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close(doneSum)
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return
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}
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}
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}
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// fireEvents takes an EventSwitch and fires a thousand integers under
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// a given `event` with the integers mootonically increasing from `offset`
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// to `offset` + 999. It additionally returns the addition of all integers
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// sent on `doneChan` for assertion that all events have been sent, and enabling
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// the test to assert all events have also been received.
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func fireEvents(evsw EventSwitch, event string, doneChan chan uint64,
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offset uint64) {
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var sentSum uint64 = 0
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for i := offset; i <= offset+uint64(999); i++ {
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sentSum += i
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evsw.FireEvent(event, i)
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}
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doneChan <- sentSum
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close(doneChan)
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}
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