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A simple & modern pure Elixir socket server
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lib/thousand_island/acceptor.ex
defmodule ThousandIsland.Acceptor do
@moduledoc false
use Task, restart: :transient
def start_link(arg), do: Task.start_link(__MODULE__, :run, [arg])
def run({server_pid, parent_pid, %ThousandIsland.ServerConfig{} = server_config}) do
listener_pid = ThousandIsland.Server.listener_pid(server_pid)
{listener_socket, listener_span} = ThousandIsland.Listener.acceptor_info(listener_pid)
connection_sup_pid = ThousandIsland.AcceptorSupervisor.connection_sup_pid(parent_pid)
span = ThousandIsland.Telemetry.start_child_span(listener_span, :acceptor)
accept(listener_socket, connection_sup_pid, server_config, span, 0)
end
defp accept(listener_socket, connection_sup_pid, server_config, span, count) do
case server_config.transport_module.accept(listener_socket) do
{:ok, socket} ->
ThousandIsland.Connection.start(connection_sup_pid, socket, server_config, span)
accept(listener_socket, connection_sup_pid, server_config, span, count + 1)
{:error, reason} when reason in [:closed, :einval] ->
ThousandIsland.Telemetry.stop_span(span, %{connections: count})
{:error, reason} ->
ThousandIsland.Telemetry.stop_span(span, %{connections: count}, %{error: reason})
raise "Unexpected error in accept: #{inspect(reason)}"
end
end
end