broker_test.go

package sarama

import (
	"fmt"
	"testing"
)

func ExampleBroker() {
	broker := NewBroker("localhost:9092")
	err := broker.Open(nil)
	if err != nil {
		panic(err)
	}

	request := MetadataRequest{Topics: []string{"myTopic"}}
	response, err := broker.GetMetadata(&request)
	if err != nil {
		_ = broker.Close()
		panic(err)
	}

	fmt.Println("There are", len(response.Topics), "topics active in the cluster.")

	if err = broker.Close(); err != nil {
		panic(err)
	}
}

type mockEncoder struct {
	bytes []byte
}

func (m mockEncoder) encode(pe packetEncoder) error {
	return pe.putRawBytes(m.bytes)
}

func TestBrokerAccessors(t *testing.T) {
	broker := NewBroker("abc:123")

	if broker.ID() != -1 {
		t.Error("New broker didn't have an ID of -1.")
	}

	if broker.Addr() != "abc:123" {
		t.Error("New broker didn't have the correct address")
	}

	broker.id = 34
	if broker.ID() != 34 {
		t.Error("Manually setting broker ID did not take effect.")
	}
}

func TestSimpleBrokerCommunication(t *testing.T) {
	mb := newMockBroker(t, 0)
	defer mb.Close()

	broker := NewBroker(mb.Addr())
	err := broker.Open(nil)
	if err != nil {
		t.Fatal(err)
	}

	for _, tt := range brokerTestTable {
		mb.Returns(&mockEncoder{tt.response})
	}
	for _, tt := range brokerTestTable {
		tt.runner(t, broker)
	}

	err = broker.Close()
	if err != nil {
		t.Error(err)
	}
}

// We're not testing encoding/decoding here, so most of the requests/responses will be empty for simplicity's sake
var brokerTestTable = []struct {
	response []byte
	runner   func(*testing.T, *Broker)
}{
	{[]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
		func(t *testing.T, broker *Broker) {
			request := MetadataRequest{}
			response, err := broker.GetMetadata(&request)
			if err != nil {
				t.Error(err)
			}
			if response == nil {
				t.Error("Metadata request got no response!")
			}
		}},

	{[]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 't', 0x00, 0x00, 0x00, 0x00},
		func(t *testing.T, broker *Broker) {
			request := ConsumerMetadataRequest{}
			response, err := broker.GetConsumerMetadata(&request)
			if err != nil {
				t.Error(err)
			}
			if response == nil {
				t.Error("Consumer Metadata request got no response!")
			}
		}},

	{[]byte{},
		func(t *testing.T, broker *Broker) {
			request := ProduceRequest{}
			request.RequiredAcks = NoResponse
			response, err := broker.Produce(&request)
			if err != nil {
				t.Error(err)
			}
			if response != nil {
				t.Error("Produce request with NoResponse got a response!")
			}
		}},

	{[]byte{0x00, 0x00, 0x00, 0x00},
		func(t *testing.T, broker *Broker) {
			request := ProduceRequest{}
			request.RequiredAcks = WaitForLocal
			response, err := broker.Produce(&request)
			if err != nil {
				t.Error(err)
			}
			if response == nil {
				t.Error("Produce request without NoResponse got no response!")
			}
		}},

	{[]byte{0x00, 0x00, 0x00, 0x00},
		func(t *testing.T, broker *Broker) {
			request := FetchRequest{}
			response, err := broker.Fetch(&request)
			if err != nil {
				t.Error(err)
			}
			if response == nil {
				t.Error("Fetch request got no response!")
			}
		}},

	{[]byte{0x00, 0x00, 0x00, 0x00},
		func(t *testing.T, broker *Broker) {
			request := OffsetFetchRequest{}
			response, err := broker.FetchOffset(&request)
			if err != nil {
				t.Error(err)
			}
			if response == nil {
				t.Error("OffsetFetch request got no response!")
			}
		}},

	{[]byte{0x00, 0x00, 0x00, 0x00},
		func(t *testing.T, broker *Broker) {
			request := OffsetCommitRequest{}
			response, err := broker.CommitOffset(&request)
			if err != nil {
				t.Error(err)
			}
			if response == nil {
				t.Error("OffsetCommit request got no response!")
			}
		}},

	{[]byte{0x00, 0x00, 0x00, 0x00},
		func(t *testing.T, broker *Broker) {
			request := OffsetRequest{}
			response, err := broker.GetAvailableOffsets(&request)
			if err != nil {
				t.Error(err)
			}
			if response == nil {
				t.Error("Offset request got no response!")
			}
		}},
}