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kafka_ex_tc
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0.12.1-1
Kafka client for Elixir/Erlang.
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lib/kafka_ex/protocol/delete_topics.ex
defmodule KafkaEx.Protocol.DeleteTopics do
alias KafkaEx.Protocol
import KafkaEx.Protocol.Common
@supported_versions_range {0, 0}
@moduledoc """
Implementation of the Kafka DeleteTopics request and response APIs
See: https://kafka.apache.org/protocol.html#The_Messages_DeleteTopics
"""
# DeleteTopics Request (Version: 0) => [topics] timeout
# topics => STRING
# timeout => INT32
# DeleteTopics Response (Version: 0) => [topic_error_codes]
# topic_error_codes => topic error_code
# topic => STRING
# error_code => INT16
defmodule Request do
@moduledoc false
defstruct topics: nil, timeout: nil
@type t :: %Request{topics: [String.t()], timeout: integer}
end
defmodule TopicError do
@moduledoc false
defstruct topic_name: nil, error_code: nil
@type t :: %TopicError{topic_name: binary, error_code: atom}
end
defmodule Response do
@moduledoc false
defstruct topic_errors: nil
@type t :: %Response{topic_errors: [TopicError.t()]}
end
def api_version(api_versions) do
KafkaEx.ApiVersions.find_api_version(
api_versions,
:delete_topics,
@supported_versions_range
)
end
@spec create_request(integer, binary, Request.t(), integer) :: binary
def create_request(
correlation_id,
client_id,
delete_topics_request,
api_version
)
def create_request(correlation_id, client_id, delete_topics_request, 0) do
Protocol.create_request(:delete_topics, correlation_id, client_id) <>
encode_topics(delete_topics_request.topics) <>
<<delete_topics_request.timeout::32-signed>>
end
@spec encode_topics([String.t()]) :: binary
defp encode_topics(topics) do
topics |> map_encode(&encode_string/1)
end
@spec parse_response(binary, integer) :: [] | Response.t()
def parse_response(
<<_correlation_id::32-signed, topic_errors_count::32-signed,
topic_errors::binary>>,
0
) do
%Response{
topic_errors: parse_topic_errors(topic_errors_count, topic_errors)
}
end
@spec parse_topic_errors(integer, binary) :: [TopicError.t()]
defp parse_topic_errors(0, _), do: []
defp parse_topic_errors(
topic_errors_count,
<<topic_name_size::16-signed, topic_name::size(topic_name_size)-binary,
error_code::16-signed, rest::binary>>
) do
[
%TopicError{
topic_name: topic_name,
error_code: Protocol.error(error_code)
}
| parse_topic_errors(topic_errors_count - 1, rest)
]
end
end