// joinGroup joins a consumer group and returns the group memberID and generationID
func joinGroup(broker *sarama.Broker, group string, topic string) (string, int32) {
joinGroupReq := &sarama.JoinGroupRequest{
GroupId: group,
SessionTimeout: int32((30 * time.Second) / time.Millisecond),
ProtocolType: "consumer",
}
meta := &sarama.ConsumerGroupMemberMetadata{
Version: 1,
Topics: []string{topic},
}
err := joinGroupReq.AddGroupProtocolMetadata("range", meta)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to add meta data err=%v\n", err)
os.Exit(1)
}
err = joinGroupReq.AddGroupProtocolMetadata("roundrobin", meta)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to add meta data err=%v\n", err)
os.Exit(1)
}
resp, err := broker.JoinGroup(joinGroupReq)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to join consumer group err=%v\n", err)
os.Exit(1)
} else if resp.Err != sarama.ErrNoError {
fmt.Fprintf(os.Stderr, "Failed to join consumer group err=%v\n", resp.Err)
os.Exit(1)
}
return resp.MemberId, resp.GenerationId
}
