func TestProducerReturnsExpectationsToChannels(t *testing.T) {
config := sarama.NewConfig()
config.Producer.Return.Successes = true
mp := NewAsyncProducer(t, config)
mp.ExpectInputAndSucceed()
mp.ExpectInputAndSucceed()
mp.ExpectInputAndFail(sarama.ErrOutOfBrokers)
mp.Input() <- &sarama.ProducerMessage{Topic: "test 1"}
mp.Input() <- &sarama.ProducerMessage{Topic: "test 2"}
mp.Input() <- &sarama.ProducerMessage{Topic: "test 3"}
msg1 := <-mp.Successes()
msg2 := <-mp.Successes()
err1 := <-mp.Errors()
if msg1.Topic != "test 1" {
t.Error("Expected message 1 to be returned first")
}
if msg2.Topic != "test 2" {
t.Error("Expected message 2 to be returned second")
}
if err1.Msg.Topic != "test 3" || err1.Err != sarama.ErrOutOfBrokers {
t.Error("Expected message 3 to be returned as error")
}
if err := mp.Close(); err != nil {
t.Error(err)
}
}
// kafkaClient initializes a connection to a Kafka cluster and
// initializes one or more clientProducer() (producer instances).
func kafkaClient(n int) {
switch noop {
// If not noop, actually fire up Kafka connections and send messages.
case false:
cId := "client_" + strconv.Itoa(n)
conf := kafka.NewConfig()
if compression != kafka.CompressionNone {
conf.Producer.Compression = compression
}
conf.Producer.Flush.MaxMessages = batchSize
client, err := kafka.NewClient(brokers, conf)
if err != nil {
log.Println(err)
os.Exit(1)
} else {
log.Printf("%s connected\n", cId)
}
for i := 0; i < producers; i++ {
go clientProducer(client)
}
// If noop, we're not creating connections at all.
// Just generate messages and burn CPU.
default:
for i := 0; i < producers; i++ {
go clientDummyProducer()
}
}
<-killClients
}
// NewConsumer returns a new mock Consumer instance. The t argument should
// be the *testing.T instance of your test method. An error will be written to it if
// an expectation is violated. The config argument is currently unused and can be set to nil.
func NewConsumer(t ErrorReporter, config *sarama.Config) *Consumer {
if config == nil {
config = sarama.NewConfig()
}
c := &Consumer{
t: t,
config: config,
partitionConsumers: make(map[string]map[int32]*PartitionConsumer),
}
return c
}
// NewAsyncProducer instantiates a new Producer mock. The t argument should
// be the *testing.T instance of your test method. An error will be written to it if
// an expectation is violated. The config argument is used to determine whether it
// should ack successes on the Successes channel.
func NewAsyncProducer(t ErrorReporter, config *sarama.Config) *AsyncProducer {
if config == nil {
config = sarama.NewConfig()
}
mp := &AsyncProducer{
t: t,
closed: make(chan struct{}, 0),
expectations: make([]*producerExpectation, 0),
input: make(chan *sarama.ProducerMessage, config.ChannelBufferSize),
successes: make(chan *sarama.ProducerMessage, config.ChannelBufferSize),
errors: make(chan *sarama.ProducerError, config.ChannelBufferSize),
}
go func() {
defer func() {
close(mp.successes)
close(mp.errors)
}()
for msg := range mp.input {
mp.l.Lock()
if mp.expectations == nil || len(mp.expectations) == 0 {
mp.expectations = nil
mp.t.Errorf("No more expectation set on this mock producer to handle the input message.")
} else {
expectation := mp.expectations[0]
mp.expectations = mp.expectations[1:]
if expectation.Result == errProduceSuccess {
mp.lastOffset++
if config.Producer.Return.Successes {
msg.Offset = mp.lastOffset
mp.successes <- msg
}
} else {
if config.Producer.Return.Errors {
mp.errors <- &sarama.ProducerError{Err: expectation.Result, Msg: msg}
}
}
}
mp.l.Unlock()
}
mp.l.Lock()
if len(mp.expectations) > 0 {
mp.t.Errorf("Expected to exhaust all expectations, but %d are left.", len(mp.expectations))
}
mp.l.Unlock()
close(mp.closed)
}()
return mp
}
