From 75218c4be0e9a2b55c871499668ceba56f7e4aa9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lo=C3=AFc=20Hoguin?= <essen@ninenines.eu>
Date: Mon, 21 Apr 2014 21:22:08 +0200
Subject: Silence expected test error reports from the console output

The errors are still logged by common_test to the report it creates.
The process that is going to crash has to call cowboy_error_h:ignore/3
with the MFA where the crash is expected to occur for it to be ignored.
Gun retry failures are also ignored. Only unexpected crashes are printed.
---
 test/cowboy_error_h.erl | 92 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 test/cowboy_error_h.erl

(limited to 'test/cowboy_error_h.erl')

diff --git a/test/cowboy_error_h.erl b/test/cowboy_error_h.erl
new file mode 100644
index 0000000..fe79645
--- /dev/null
+++ b/test/cowboy_error_h.erl
@@ -0,0 +1,92 @@
+%% Copyright (c) 2014, 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(cowboy_error_h).
+-behaviour(gen_event).
+
+%% Public interface.
+-export([ignore/3]).
+
+%% gen_event.
+-export([init/1]).
+-export([handle_event/2]).
+-export([handle_call/2]).
+-export([handle_info/2]).
+-export([terminate/2]).
+-export([code_change/3]).
+
+%% Public interface.
+
+%% Ignore crashes from Pid occuring in M:F/A.
+ignore(M, F, A) ->
+	gen_event:call(error_logger, ?MODULE, {expect, self(), M, F, A}).
+
+%% gen_event.
+
+init(_) ->
+	{ok, []}.
+
+%% Ignore supervisor and progress reports.
+handle_event({info_report, _, {_, progress, _}}, State) ->
+	{ok, State};
+handle_event({info_report, _, {_, std_info, _}}, State) ->
+	{ok, State};
+handle_event({error_report, _, {_, supervisor_report, _}}, State) ->
+	{ok, State};
+%% Ignore gun retry failures.
+handle_event({error_report, _, {_, crash_report,
+		[[{initial_call, {gun, init, _}}, _, _,
+			{error_info, {error, gone, _}}|_]|_]}},
+		State) ->
+	{ok, State};
+%% Ignore emulator reports, they are a duplicate of what Ranch gives us.
+handle_event({error, _, {emulator, _, _}}, State) ->
+	{ok, State};
+handle_event(Event = {error, GL,
+		{_, "Ranch listener" ++ _, [_, _, Pid, {[_, _,
+			{stacktrace, [{M, F, A, _}|_]}|_], _}]}},
+		State) when node(GL) =:= node() ->
+	A2 = if is_list(A) -> length(A); true -> A end,
+	Crash = {Pid, M, F, A2},
+	case lists:member(Crash, State) of
+		true ->
+			{ok, lists:delete(Crash, State)};
+		false ->
+			write_event(Event),
+			{ok, State}
+	end;
+handle_event(Event = {_, GL, _}, State) when node(GL) =:= node() ->
+	write_event(Event),
+	{ok, State};
+handle_event(_, State) ->
+	{ok, State}.
+
+handle_call({expect, Pid, M, F, A}, State) ->
+	{ok, ok, [{Pid, M, F, A}|State]};
+handle_call(_, State) ->
+	{ok, {error, bad_query}, State}.
+
+handle_info(_, State) ->
+	{ok, State}.
+
+terminate(_, _) ->
+	ok.
+
+code_change(_, State, _) ->
+	{ok, State}.
+
+write_event(Event) ->
+	error_logger_tty_h:write_event(
+		{erlang:universaltime(), Event},
+		io).
-- 
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