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Don't crash when cowboy_clock is not running

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This can happen normally when Cowboy is restarted, for example.
Instead of failing requests when that happens, we degrade
gracefully and do a little more work to provide the current
date header.
This commit is contained in:
Loïc Hoguin 2017-11-01 17:06:37 +00:00
parent 836342abb8
commit 5bb6438e10
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2 changed files with 36 additions and 3 deletions
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10
src/cowboy_clock.erl
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@ -49,9 +49,17 @@ start_link() ->
stop() ->
gen_server:call(?MODULE, stop).
%% When the ets table doesn't exist, either because of a bug
%% or because Cowboy is being restarted, we perform in a
%% slightly degraded state and build a new timestamp for
%% every request.
-spec rfc1123() -> binary().
rfc1123() ->
ets:lookup_element(?MODULE, rfc1123, 2).
try
ets:lookup_element(?MODULE, rfc1123, 2)
catch error:badarg ->
rfc1123(erlang:universaltime())
end.
-spec rfc1123(calendar:datetime()) -> binary().
rfc1123(DateTime) ->