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kafka_ex_tc
0.12.1-21
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0.12.1-1
Kafka client for Elixir/Erlang.
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lib/kafka_ex/protocol/offset_fetch.ex
defmodule KafkaEx.Protocol.OffsetFetch do
alias KafkaEx.Protocol
import KafkaEx.Protocol.Common
@moduledoc """
Implementation of the Kafka OffsetFetch request and response APIs
"""
defmodule Request do
@moduledoc false
defstruct consumer_group: nil,
topic: nil,
partition: nil,
# NOTE api_version only used in new client
api_version: 0
@type t :: %Request{
consumer_group: nil | binary,
topic: binary,
partition: integer,
api_version: integer
}
end
defmodule Response do
@moduledoc false
defstruct topic: nil, partitions: []
@type t :: %Response{topic: binary, partitions: list}
def last_offset(:topic_not_found) do
0
end
def last_offset(offset_fetch_data) do
case offset_fetch_data do
[] ->
0
_ ->
partitions = offset_fetch_data |> hd |> Map.get(:partitions, [])
case partitions do
[] -> 0
_ -> partitions |> hd |> Map.get(:offset, 0)
end
end
end
end
def create_request(correlation_id, client_id, offset_fetch_request) do
KafkaEx.Protocol.create_request(:offset_fetch, correlation_id, client_id) <>
<<byte_size(offset_fetch_request.consumer_group)::16-signed,
offset_fetch_request.consumer_group::binary, 1::32-signed,
byte_size(offset_fetch_request.topic)::16-signed,
offset_fetch_request.topic::binary, 1::32-signed,
offset_fetch_request.partition::32>>
end
def parse_response(
<<_correlation_id::32-signed, topics_size::32-signed,
topics_data::binary>>
) do
parse_topics(topics_size, topics_data, __MODULE__)
end
def parse_partitions(0, rest, partitions, _topic), do: {partitions, rest}
def parse_partitions(
partitions_size,
<<partition::32-signed, offset::64-signed, metadata_size::16-signed,
metadata::size(metadata_size)-binary, error_code::16-signed,
rest::binary>>,
partitions,
topic
) do
parse_partitions(
partitions_size - 1,
rest,
[
%{
partition: partition,
offset: offset,
metadata: metadata,
error_code: Protocol.error(error_code)
}
| partitions
],
topic
)
end
end