Hi,
I am trying to create a library in Go, to use the Kafka protocol binary format.
As a first step, I am trying the ApiVersions request.
The request is processed successfully by the Kafka broker and it responds with
an ApiVersions response as well. And it conforms to the following spec as per
the protocol :
ApiVersions Response (Version: 0) => error_code [api_keys]
error_code => INT16
api_keys => api_key min_version max_version
api_key => INT16
min_version => INT16
max_version => INT16
When I look at the response, how do I know how many api_keys list items I need
to process ?
I did manage to arrive at a way of doing this as below, but not sure if that is
the way to do it :
If I look at the Wireshark capture, I can see that just before the first
api_keys item in the response, there is a single byte/octet which contains a
value of let's say 0x61. This evaluates to 97.
Whereas I get 96 api_keys items in the response.
This is the case everytime I send an ApiVersions request to different versions
of Kafka.
Meaning that the value in this byte is always 1 more than the number of items
returned.
Is it a fair understanding that this byte will always indicate a number one
more than the number of ApiKey items returned in the response ?
Regards,
Neeraj
