117 lines
3.4 KiB
Elixir
117 lines
3.4 KiB
Elixir
# source code taken from https://github.com/reachfh/brod_group_subscriber_example
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defmodule KafkaexLagExporter.KafkaUtils do
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@behaviour KafkaexLagExporter.KafkaUtils.Behaviour
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@moduledoc "Utility functions for dealing with Kafka"
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alias KafkaexLagExporter.KafkaWrapper.Behaviour, as: KafkaWrapper
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require Logger
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@default_client :client1
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def connection, do: connection(@default_client)
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@impl true
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def connection(client) do
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clients = Application.get_env(:brod, :clients)
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config = clients[client]
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endpoints = config[:endpoints] || [{~c"localhost", 9092}]
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sock_opts =
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case Keyword.fetch(config, :ssl) do
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{:ok, ssl_opts} ->
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[ssl: ssl_opts]
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:error ->
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[]
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end
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{endpoints, sock_opts}
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end
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@impl true
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def resolve_offsets(topic, type, client) do
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{endpoints, sock_opts} = connection(client)
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{:ok, partitions_count} = KafkaWrapper.get_partitions_count(client, topic)
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for i <- Range.new(0, partitions_count - 1),
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{:ok, offset} =
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KafkaWrapper.resolve_offset(endpoints, topic, i, type, sock_opts) do
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{i, offset}
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end
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end
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@impl true
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def fetch_committed_offsets(_topic, consumer_group, client) do
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{endpoints, sock_opts} = connection(client)
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{:ok, response} = KafkaWrapper.fetch_committed_offsets(endpoints, sock_opts, consumer_group)
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for r <- response,
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pr <- r[:partitions],
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do: {pr[:partition_index], pr[:committed_offset]}
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end
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@impl true
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def lag(topic, consumer_group, client) do
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offsets =
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resolve_offsets(topic, :latest, client)
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|> Enum.sort_by(fn {key, _value} -> key end)
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committed_offsets =
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fetch_committed_offsets(topic, consumer_group, client)
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|> Enum.sort_by(fn {key, _value} -> key end)
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for {{part, current}, {_part2, committed}} <- Enum.zip(offsets, committed_offsets) do
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{part, current - committed}
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end
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end
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@impl true
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def lag_total(topic, consumer_group, client) do
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for {_part, recs} <- lag(topic, consumer_group, client), reduce: 0 do
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acc -> acc + recs
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end
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end
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@impl true
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def get_consumer_group_names({host, port}) do
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[{_, groups} | _] = KafkaWrapper.list_all_groups([{host, port}], [])
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groups
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|> Enum.filter(fn {_, _, protocol} -> protocol === "consumer" end)
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|> Enum.map(fn {_, group_name, _} -> group_name end)
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end
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@impl true
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def get_consumer_group_info(endpoint, list \\ [], consumer_group_names) do
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{:ok, group_descriptions} = KafkaWrapper.describe_groups(endpoint, list, consumer_group_names)
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group_descriptions
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|> Enum.flat_map(fn %{group_id: consumer_group, members: members} ->
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get_member_info(members)
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|> Enum.map(fn {topic_names, consumer_id, member_host} ->
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{consumer_group, topic_names, consumer_id, member_host}
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end)
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end)
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end
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@spec get_member_info(
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list(%{client_host: binary, member_assignment: binary, member_id: binary})
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) ::
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list({topic_names :: list(binary), consumer_id :: binary, member_host :: binary})
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defp get_member_info(members) do
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Enum.map(members, fn %{
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client_host: member_host,
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member_assignment: member_assignment,
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member_id: consumer_id
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} ->
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topic_names = KafkaexLagExporter.TopicNameParser.parse_topic_names(member_assignment)
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{topic_names, consumer_id, member_host}
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end)
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end
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end
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