// Simple test for publishing and received versioned events using rabbitmq
func TestEventBus(t *testing.T) {
// Create a new event bus
bus := rabbit.NewEventBus("amqp://*****:*****@localhost:5672/", "rabbit_testevents", "testing.events")
// Register types
eventType := reflect.TypeOf(SampleEvent{})
eventTypeCache := cqrs.NewTypeRegistry()
eventTypeCache.RegisterType(SampleEvent{})
// Create communication channels
//
// for closing the queue listener,
closeChannel := make(chan chan error)
// receiving errors from the listener thread (go routine)
errorChannel := make(chan error)
// and receiving events from the queue
receiveEventChannel := make(chan cqrs.VersionedEventTransactedAccept)
// Start receiving events by passing these channels to the worker thread (go routine)
if err := bus.ReceiveEvents(cqrs.VersionedEventReceiverOptions{eventTypeCache, closeChannel, errorChannel, receiveEventChannel, false}); err != nil {
t.Fatal(err)
}
// Publish a simple event to the exchange http://www.rabbitmq.com/tutorials/tutorial-three-python.html
log.Println("Publishing events")
go func() {
if err := bus.PublishEvents([]cqrs.VersionedEvent{cqrs.VersionedEvent{
EventType: eventType.String(),
Event: SampleEvent{"rabbit_TestEventBus"}}}); err != nil {
t.Fatal(err)
}
}()
// If we dont receive a message within 5 seconds this test is a failure. Use a channel to signal the timeout
timeout := make(chan bool, 1)
go func() {
time.Sleep(5 * time.Second)
timeout <- true
}()
// Wait on multiple channels using the select control flow.
select {
// Test timeout
case <-timeout:
t.Fatal("Test timed out")
// Version event received channel receives a result with a channel to respond to, signifying successful processing of the message.
// This should eventually call an event handler. See cqrs.NewVersionedEventDispatcher()
case event := <-receiveEventChannel:
sampleEvent := event.Event.Event.(SampleEvent)
log.Println(sampleEvent.Message)
event.ProcessedSuccessfully <- true
// Receiving on this channel signifys an error has occured work processor side
case err := <-errorChannel:
t.Fatal(err)
}
}
func RunScenario(t *testing.T, persistance cqrs.EventStreamRepository) {
typeRegistry := cqrs.NewTypeRegistry()
bus := rabbit.NewEventBus("amqp://*****:*****@localhost:5672/", "example_test", "testing.example")
repository := cqrs.NewRepositoryWithPublisher(persistance, bus, typeRegistry)
repository.GetTypeRegistry().RegisterAggregate(&Account{})
repository.GetTypeRegistry().RegisterEvents(AccountCreatedEvent{}, EmailAddressChangedEvent{}, AccountCreditedEvent{}, AccountDebitedEvent{}, PasswordChangedEvent{})
accountID := "5058e029-d329-4c4b-b111-b042e48b0c5f"
readModel := NewReadModelAccounts()
usersModel := NewUsersModel()
eventDispatcher := cqrs.NewVersionedEventDispatchManager(bus, typeRegistry)
eventDispatcher.RegisterEventHandler(AccountCreatedEvent{}, func(event cqrs.VersionedEvent) error {
readModel.UpdateViewModel([]cqrs.VersionedEvent{event})
usersModel.UpdateViewModel([]cqrs.VersionedEvent{event})
return nil
})
eventDispatcher.RegisterEventHandler(AccountCreditedEvent{}, func(event cqrs.VersionedEvent) error {
readModel.UpdateViewModel([]cqrs.VersionedEvent{event})
return nil
})
eventDispatcher.RegisterEventHandler(AccountDebitedEvent{}, func(event cqrs.VersionedEvent) error {
readModel.UpdateViewModel([]cqrs.VersionedEvent{event})
return nil
})
eventDispatcher.RegisterEventHandler(EmailAddressChangedEvent{}, func(event cqrs.VersionedEvent) error {
readModel.UpdateViewModel([]cqrs.VersionedEvent{event})
usersModel.UpdateViewModel([]cqrs.VersionedEvent{event})
return nil
})
eventDispatcher.RegisterEventHandler(PasswordChangedEvent{}, func(event cqrs.VersionedEvent) error {
usersModel.UpdateViewModel([]cqrs.VersionedEvent{event})
return nil
})
stopChannel := make(chan bool)
go eventDispatcher.Listen(stopChannel)
testCorrelationID := uuid.New()
readModel.LoadAccounts(persistance)
usersModel.LoadUsers(persistance)
log.Println("Loaded accounts")
log.Println(readModel)
log.Println("Loaded Users")
log.Println(usersModel)
log.Println("Create or find an account")
readModelAccount := readModel.Accounts[accountID]
log.Println(readModelAccount)
log.Println("Create or find a user")
user := usersModel.Users[accountID]
log.Println(user)
var account *Account
if readModelAccount == nil {
log.Println("Get hash for user...")
hashedPassword, err := GetHashForPassword("$ThisIsMyPassword1")
if err != nil {
t.Fatal("Error: ", err)
}
log.Println("Get hash for user...")
log.Println("Create new account...")
account = NewAccount("John", "Snow", "*****@*****.**", hashedPassword, 0.0)
log.Println("Set ID...")
account.SetID(accountID)
log.Println(account)
} else {
account, _ = NewAccountFromHistory(accountID, repository)
}
log.Println(account)
log.Println(readModel)
log.Println(usersModel)
account.ChangePassword("$ThisIsANOTHERPassword")
if !account.CheckPassword("$ThisIsANOTHERPassword") {
t.Fatal("Password is incorrect for account")
}
log.Println("Change email address and credit the account")
account.ChangeEmailAddress("*****@*****.**")
account.Credit(50)
account.Credit(50)
log.Println(account)
log.Println(readModel)
log.Println("Persist the account")
repository.Save(account, "")
log.Println(readModel)
log.Println(usersModel)
log.Println("Load the account from history")
account, error := NewAccountFromHistory(accountID, repository)
if error != nil {
t.Fatal(error)
}
log.Println(account)
log.Println(readModel)
log.Println("Change the email address, credit 150, debit 200")
lastEmailAddress := "*****@*****.**"
account.ChangeEmailAddress(lastEmailAddress)
account.Credit(150)
account.Debit(200)
log.Println(account)
log.Println(readModel)
log.Println("Persist the account")
repository.Save(account, testCorrelationID)
log.Println(readModel)
log.Println(usersModel)
log.Println("Load the account from history")
account, error = NewAccountFromHistory(accountID, repository)
if error != nil {
t.Fatal(error)
}
time.Sleep(100 * time.Millisecond)
// All events should have been replayed and the email address should be the latest
log.Println(account)
log.Println(readModel)
// log.Println(usersModel)
if account.EmailAddress != lastEmailAddress {
t.Fatal("Expected emailaddress to be ", lastEmailAddress)
}
log.Println("Stop channel")
stopChannel <- true
log.Println("GetIntegrationEventsByCorrelationID")
correlationEvents, err := persistance.GetIntegrationEventsByCorrelationID(testCorrelationID)
if err != nil {
t.Fatal(err)
}
if len(correlationEvents) == 0 {
t.Fatal("Expected correlation events")
}
for _, correlationEvent := range correlationEvents {
log.Println(glr.Green(fmt.Sprintf("%v", correlationEvent.Event)))
}
}