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Work around OTP applications which do not respond #88

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Work around OTP applications which do not respond #88

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11 changes: 9 additions & 2 deletions apps/epl_st/src/epl_st.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,8 @@

-behaviour(gen_server).

-define(LIVENESS_TIMEOUT, 1000).
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I'd rename this to something more meaningful, maybe TOP_SUP_RESP_TIMEOUT?


%% API
-export([start_link/0,
subscribe/0,
Expand Down Expand Up @@ -101,8 +103,13 @@ generate_sup_tree(undefined) ->
#{};
generate_sup_tree(MasterPid) ->
{SupPid, _SupName} = command(fun application_master:get_child/1, [MasterPid]),
Children = command(fun supervisor:which_children/1, [SupPid]),
sup_node(SupPid, generate_children(Children)).
case catch sys:get_status(SupPid, ?LIVENESS_TIMEOUT) of
{'EXIT', {timeout, _}} ->
#{};
_ ->
Children = command(fun supervisor:which_children/1, [SupPid]),
sup_node(SupPid, generate_children(Children))
end.

generate_children(Children) ->
lists:filtermap(
Expand Down