cowboy/test/misc_SUITE.erl

%% Copyright (c) 2017, Loïc Hoguin <essen@ninenines.eu>
%%
%% 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(misc_SUITE).
-compile(export_all).
-compile(nowarn_export_all).

-import(ct_helper, [config/2]).
-import(ct_helper, [doc/1]).
-import(cowboy_test, [gun_open/1]).

all() ->
	[{group, app}, {group, set_env}|cowboy_test:common_all()].

groups() ->
	Common = ct_helper:all(?MODULE)
		-- [restart_gracefully, set_env, set_env_missing],
	[
		{app, [], [restart_gracefully]},
		{set_env, [parallel], [set_env, set_env_missing]}
	|cowboy_test:common_groups(Common)].

init_per_group(Name=app, Config) ->
	cowboy_test:init_http(Name, #{
		env => #{dispatch => init_dispatch(Config)}
	}, Config);
init_per_group(set_env, Config) ->
	Config;
init_per_group(Name, Config) ->
	cowboy_test:init_common_groups(Name, Config, ?MODULE).

end_per_group(set_env, _) ->
	ok;
end_per_group(Name, _) ->
	cowboy:stop_listener(Name).

init_dispatch(_) ->
	cowboy_router:compile([{"localhost", [
		{"/", hello_h, []}
	]}]).

%% Logger function silencing the expected crash.

error("Ranch listener " ++ _, [set_env_missing|_]) ->
	ok;
error(Format, Args) ->
	error_logger:error_msg(Format, Args).

%% Tests.

restart_gracefully(Config) ->
	doc("Ensure we can process request when the cowboy application is being restarted."),
	ConnPid = gun_open(Config),
	%% We can do a request before stopping cowboy.
	Ref1 = gun:get(ConnPid, "/"),
	{response, _, 200, _} = gun:await(ConnPid, Ref1),
	%% Stop the cowboy application.
	ok = application:stop(cowboy),
	%% We can still do a request even though cowboy is stopped.
	Ref2 = gun:get(ConnPid, "/"),
	{response, _, 200, _} = gun:await(ConnPid, Ref2),
	%% Start the cowboy application again.
	ok = application:start(cowboy),
	%% Even after restarting there are no issues.
	Ref3 = gun:get(ConnPid, "/"),
	{response, _, 200, _} = gun:await(ConnPid, Ref3),
	ok.

router_invalid_path(Config) ->
	doc("Ensure a path with invalid percent-encoded characters results in a 400."),
	ConnPid = gun_open(Config),
	Ref = gun:get(ConnPid, "/version/path/%\\u0016\\u0016/path"),
	{response, _, 400, _} = gun:await(ConnPid, Ref),
	ok.

set_env(Config0) ->
	doc("Live replace a middleware environment value."),
	Config = cowboy_test:init_http(?FUNCTION_NAME, #{
		env => #{dispatch => []}
	}, Config0),
	try
		ConnPid1 = gun_open(Config),
		Ref1 = gun:get(ConnPid1, "/"),
		{response, _, 400, _} = gun:await(ConnPid1, Ref1),
		cowboy:set_env(?FUNCTION_NAME, dispatch, init_dispatch(Config)),
		%% Only new connections get the updated environment.
		ConnPid2 = gun_open(Config),
		Ref2 = gun:get(ConnPid2, "/"),
		{response, _, 200, _} = gun:await(ConnPid2, Ref2)
	after
		cowboy:stop_listener(?FUNCTION_NAME)
	end.

set_env_missing(Config0) ->
	doc("Live replace a middleware environment value when env was not provided."),
	Config = cowboy_test:init_http(?FUNCTION_NAME, #{
		logger => ?MODULE
	}, Config0),
	try
		ConnPid1 = gun_open(Config),
		Ref1 = gun:get(ConnPid1, "/"),
		{response, _, 500, _} = gun:await(ConnPid1, Ref1),
		cowboy:set_env(?FUNCTION_NAME, dispatch, []),
		%% Only new connections get the updated environment.
		ConnPid2 = gun_open(Config),
		Ref2 = gun:get(ConnPid2, "/"),
		{response, _, 400, _} = gun:await(ConnPid2, Ref2)
	after
		cowboy:stop_listener(?FUNCTION_NAME)
	end.