-module(batch_echo_protocol).
-behaviour(ranch_protocol).
-export([start_link/3]).
-export([init/3]).
start_link(Ref, Transport, [{batch_size, N}]) ->
Pid = spawn_link(?MODULE, init, [Ref, Transport, N]),
{ok, Pid}.
init(Ref, Transport, N) ->
{ok, Socket} = ranch:handshake(Ref),
Transport:setopts(Socket, [{active, N}]),
loop(Socket, Transport, N, <<>>).
loop(Socket, Transport, N, Acc) ->
{OK, Closed, Error, Passive} = Transport:messages(),
receive
{OK, Socket, Data} ->
Transport:send(Socket, <<"OK">>),
loop(Socket, Transport, N, <<Acc/binary, Data/binary>>);
{Passive, Socket} ->
Transport:send(Socket, Acc),
Transport:setopts(Socket, [{active, N}]),
loop(Socket, Transport, N, <<>>);
{Closed, Socket} ->
ok;
{Error, Socket, _} ->
ok = Transport:close(Socket)
end.
