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Use :ets and execute AWS in a task for isolation #1

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Use :ets and execute AWS in a task for isolation #1

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35 changes: 18 additions & 17 deletions lib/libcluster/ecs_cluster_info.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -13,37 +13,34 @@ defmodule Cluster.EcsClusterInfo do
@refresh_timeout 10_000

def start_link(config) do
GenServer.start_link(__MODULE__, config, name: __MODULE__)
GenServer.start_link(__MODULE__, config)
end

@spec get_nodes() ::
%{(node_name :: String.t()) => {ip :: tuple(), port :: integer()}} | no_return()
def get_nodes() do
GenServer.call(__MODULE__, :get_nodes)
:ets.tab2list(:ecs_cluster_info)
|> Map.new()
end

@impl true
def init(config) do
:ets.new(:ecs_cluster_info, [:set, :public, :named_table])

set_refresh()

state = set_config(config, %{})
Task.start(fn -> :ok = my_get_nodes(state) end)

{:ok, nodes} = my_get_nodes(state)

{:ok, state |> Map.put(:nodes, nodes)}
end

@impl true
def handle_call(:get_nodes, _from, state) do
{:reply, Map.get(state, :nodes, %{}), state}
{:ok, state}
end

@impl true
def handle_info(:refresh, state) do
{:ok, nodes} = my_get_nodes(state)

set_refresh()
{:noreply, state |> Map.put(:nodes, nodes)}
Task.start(fn -> :ok = my_get_nodes(state) end)

{:noreply, state}
end

defp set_refresh() do
Expand Down Expand Up @@ -79,10 +76,14 @@ defmodule Cluster.EcsClusterInfo do
{:ok, desc_task_body} <- describe_tasks(cluster_name, task_arns, region),
{:ok, arns_ports} <- extract_arns_ports(desc_task_body, container_port),
{:ok, ips_ports} <- extract_ips_ports(cluster_name, arns_ports, region) do
{:ok,
Map.new(ips_ports, fn {runtime_id, ip, port} ->
{runtime_id_to_nodename(runtime_id, app_prefix), {ip, port}}
end)}
Enum.each(ips_ports, fn {runtime_id, ip, port} ->
:ets.insert(
:ecs_cluster_info,
{runtime_id_to_nodename(runtime_id, app_prefix), {ip, port}}
)
end)

:ok
else
err ->
Logger.warn(fn -> "Error #{inspect(err)} while determining nodes in cluster via ECS" end)
Expand Down