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%% Copyright (c) 2017-2020, Loïc Hoguin <[email protected]>
%%
%% Permission to use, copy, modify, and/or distribute this software for any
%% purpose with or without fee is hereby granted, provided that the above
%% copyright notice and this permission notice appear in all copies.
%%
%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-module(gun_ws_h).
-export([init/4]).
-export([handle/2]).
-record(state, {
reply_to :: pid(),
stream_ref :: reference(),
frag_buffer = <<>> :: binary(),
silence_pings :: boolean()
}).
init(ReplyTo, StreamRef, _, Opts) ->
{ok, #state{reply_to=ReplyTo, stream_ref=StreamRef,
silence_pings=maps:get(silence_pings, Opts, true)}}.
handle({fragment, nofin, _, Payload},
State=#state{frag_buffer=SoFar}) ->
{ok, 0, State#state{frag_buffer= << SoFar/binary, Payload/binary >>}};
handle({fragment, fin, Type, Payload},
State=#state{reply_to=ReplyTo, stream_ref=StreamRef, frag_buffer=SoFar}) ->
ReplyTo ! {gun_ws, self(), StreamRef, {Type, << SoFar/binary, Payload/binary >>}},
{ok, 1, State#state{frag_buffer= <<>>}};
handle(Frame, State=#state{silence_pings=true}) when Frame =:= ping; Frame =:= pong;
element(1, Frame) =:= ping; element(1, Frame) =:= pong ->
{ok, 0, State};
handle(Frame, State=#state{reply_to=ReplyTo, stream_ref=StreamRef}) ->
ReplyTo ! {gun_ws, self(), StreamRef, Frame},
{ok, 1, State}.
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