[erlang-questions] cowboy websocket crash, need help

[Akash Chowdhury]

All,
I am trying to establish an websocket connection using cowboy. I am using
the base example given in cowboy websocket github. I am getting following
crash:

2015-01-15 20:40:01.777 [error] emulator Error in process <0.185.0> on node
'erws@REDACTED' with exit value: {[{re
ason,undef},{mfa,{erws_handler,terminate,3}},{stacktrace,[{lager,debug,["terminate"],[]},{erws_handler,terminate,3,[{fi
le,"erws_handler.erl"},{line,48}]},{cowboy_handler,terminate,4,[{file,"cowboy_handler.erl"},{line,69}]},...


2015-01-15 20:40:01.781 [error] <0.81.0> Ranch listener http had connection
process started with cowboy_protocol:start_
link/4 at <0.185.0> exit with reason:
{[{reason,undef},{mfa,{erws_handler,terminate,3}},{stacktrace,[{lager,debug,["ter
minate"],[]},{erws_handler,terminate,3,[{file,"erws_handler.erl"},{line,48}]},{cowboy_handler,terminate,4,[{file,"cowbo
y_handler.erl"},{line,69}]},{cowboy_handler,execute,2,[{file,"cowboy_handler.erl"},{line,54}]},{cowboy_protocol,execute
,4,[{file,"cowboy_protocol.erl"},{line,467}]}]},{req,[{socket,#Port<0.2498>},{transport,ranch_tcp},{connection,keepaliv
e},{pid,<0.185.0>},{method,<<"GET">>},{version,'HTTP/1.1'},{peer,{{10,69,209,221},49793}},{host,<<"sas755dev.hss.vzwcor
p.com
">>},{host_info,undefined},{port,10100},{path,<<"/websocket">>},{path_info,undefined},{qs,<<>>},{bindings,[]},{hea
ders,[{<<"host">>,<<"sas755dev.hss.xxxxxx.com:10100">>},{<<"user-agent">>,<<"Mozilla/5.0
(Windows NT 6.1; rv:34.0) Gec
ko/20100101
Firefox/34.0">>},{<<"accept">>,<<"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8">>},{<<"a
ccept-language">>,<<"en-US,en;q=0.5">>},{<<"accept-encoding">>,<<"gzip,
deflate">>},{<<"sec-websocket-version">>,<<"13"
>>},{<<"origin">>,<<"null">>},{<<"sec-websocket-key">>,<<"Uj2HLRfte83Kyu9r9qEesQ==">>},{<<"connection">>,<<"keep-alive,
 Upgrade">>},{<<"pragma">>,<<"no-cache">>},{<<"cache-control">>,<<"no-cache">>},{<<"upgrade">>,<<"websocket">>}]},{meta
,[]},{body_state,waiting},{buffer,<<>>},{multipart,undefined},{resp_compress,false},{resp_state,waiting},{resp_headers,
[]},{resp_body,<<>>},{onresponse,undefined}]},{state,[]},{terminate_reason,{crash,error,undef}}],[{cowboy_handler,execu
te,2,[{file,"cowboy_handler.erl"},{line,59}]},{cowboy_protocol,execute,4,[{file,"cowboy_protocol.erl"},{line,467}]}]}

Here is my erws_handler.erl  file which is almost like example file
provided in cowboy websocket github

-module(erws_handler).
-behaviour(cowboy_http_handler).
-behaviour(cowboy_websocket_handler).
-export([init/3, handle/2, terminate/3]).
-export([
    websocket_init/3, websocket_handle/3,
    websocket_info/3, websocket_terminate/3
]).

init({tcp, http}, _Req, _Opts) ->
  {upgrade, protocol, cowboy_websocket}.


handle(Req, State) ->
    lager:debug("Request not expected: ~p", [Req]),
    {ok, Req2} = cowboy_http_req:reply(404, [{'Content-Type',
<<"text/html">>}]),
    {ok, Req2, State}.


websocket_init(_TransportName, Req, _Opts) ->
    lager:debug("init websocket"),
    {ok, Req, undefined_state}.

websocket_handle({text, Msg}, Req, State) ->
    lager:debug("Got Data: ~p", [Msg]),
    {reply, {text, << "responding to ", Msg/binary >>}, Req, State,
hibernate };


websocket_handle(_Any, Req, State) ->
    lager:debug("Got Any"),
    {reply, {text, << "whut?">>}, Req, State, hibernate }.

websocket_info({timeout, _Ref, Msg}, Req, State) ->
    lager:debug("websocket info_timeout"),
    {reply, {text, Msg}, Req, State};

websocket_info(_Info, Req, State) ->
    lager:debug("websocket info"),
    {ok, Req, State, hibernate}.

websocket_terminate(_Reason, _Req, _State) ->
    % lager:debug("websocket terminate. reason: ~p",[_Reason]),
    lager:debug("websocket terminate"),
    ok.

terminate(_Reason, _Req, _State) ->
     % lager:debug("terminate. Reason : ~p",[_Reason]),
     lager:debug("terminate"),
    ok.

I am trying from a simple html file through Mozilla Firefox :

ws = new WebSocket("ws://sas755dev.hss.xxxxxx.com:10100/websocket");

I need to provide port number with host name. Is that ok? Does cowboy
support it? Is providing port number causing this issue? If not, then what
else? Can anyone help me? Any help regarding this will be highly
appreciated.
Thanks.
-
Akash
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