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-module(rexi_utils).
-export([recv/6]).
%% @doc set up the receive loop with an overall timeout
-spec recv([any()], integer(), function(), any(), timeout(), timeout()) ->
{ok, any()} | timeout | {error, any()}.
recv(Refs, Keypos, Fun, Acc0, infinity, PerMsgTO) ->
process_mailbox(Refs, Keypos, Fun, Acc0, nil, PerMsgTO);
recv(Refs, Keypos, Fun, Acc0, GlobalTimeout, PerMsgTO) ->
TimeoutRef = erlang:make_ref(),
TRef = erlang:send_after(GlobalTimeout, self(), {timeout, TimeoutRef}),
try
process_mailbox(Refs, Keypos, Fun, Acc0, TimeoutRef, PerMsgTO)
after
erlang:cancel_timer(TRef)
end.
process_mailbox(RefList, Keypos, Fun, Acc0, TimeoutRef, PerMsgTO) ->
case process_message(RefList, Keypos, Fun, Acc0, TimeoutRef, PerMsgTO) of
{ok, Acc} ->
process_mailbox(RefList, Keypos, Fun, Acc, TimeoutRef, PerMsgTO);
{stop, Acc} ->
{ok, Acc};
Error ->
Error
end.
process_message(RefList, Keypos, Fun, Acc0, TimeoutRef, PerMsgTO) ->
receive
{timeout, TimeoutRef} ->
timeout;
{Ref, Msg} ->
case lists:keyfind(Ref, Keypos, RefList) of
false ->
% this was some non-matching message which we will ignore
{ok, Acc0};
Worker ->
Fun(Msg, Worker, Acc0)
end;
{Ref, From, Msg} ->
case lists:keyfind(Ref, Keypos, RefList) of
false ->
{ok, Acc0};
Worker ->
Fun(Msg, {Worker, From}, Acc0)
end;
{rexi_DOWN, _RexiMonPid, ServerPid, Reason} = Msg ->
io:format("rexi_DOWN ~p ~p", [ServerPid, Reason]),
Fun(Msg, nil, Acc0)
after PerMsgTO ->
timeout
end.
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