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Kafka protocol library for Erlang/Elixir
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kafka_protocol
README.md
README.md
# Kafka protocol library for Erlang/Elixir
This is a kafka wire format encode/decode library, not a kafka client.
See https://github.com/klarna/brod for kafka client implementation.
Code generated from org.apache.kafka.common.protocol.Protocol.
## How to generate priv/kafka.bnf
Ensure you have JDK (1.7+) and gradle (2.0+) installed.
Change kafka version in priv/kafka_protocol_bnf/build.gradle if needed.
make kafka-bnf
## How to generate src/kafka_schema.erl
make gen-code
## Schema explained
Take `produce_request` for example
```
get(produce_request, V) when V >= 0, V =< 2 ->
[{acks,int16},
{timeout,int32},
{topic_data,{array,[{topic,string},
{data,{array,[{partition,int32},
{record_set,records}]}}]}}];
```
It is generated from below BNF block.
```
ProduceRequestV0 => acks timeout [topic_data]
acks => INT16
timeout => INT32
topic_data => topic [data]
topic => STRING
data => partition record_set
partition => INT32
record_set => RECORDS
```
The root level `schema` is always a `struct`.
A `struct` consists of fields having lower level `schema`
which can be another `struct`, an `array` or a `primitive`.