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-rw-r--r--lib/diameter/src/base/diameter_watchdog.erl51
1 files changed, 34 insertions, 17 deletions
diff --git a/lib/diameter/src/base/diameter_watchdog.erl b/lib/diameter/src/base/diameter_watchdog.erl
index c6d0a0b6ed..3c0d8f6f6e 100644
--- a/lib/diameter/src/base/diameter_watchdog.erl
+++ b/lib/diameter/src/base/diameter_watchdog.erl
@@ -66,7 +66,9 @@
%% end PCB
parent = self() :: pid(), %% service process
transport :: pid() | undefined, %% peer_fsm process
- tref :: reference(), %% reference for current watchdog timer
+ tref :: reference() %% reference for current watchdog timer
+ | integer() %% monotonic time
+ | undefined,
dictionary :: module(), %% common dictionary
receive_data :: term(),
%% term passed into diameter_service with incoming message
@@ -94,7 +96,7 @@ start({_,_} = Type, T) ->
Ack = make_ref(),
{ok, Pid} = diameter_watchdog_sup:start_child({Ack, Type, self(), T}),
try
- {erlang:monitor(process, Pid), Pid}
+ {monitor(process, Pid), Pid}
after
send(Pid, Ack)
end.
@@ -121,7 +123,7 @@ i({Ack, T, Pid, {RecvData,
#diameter_service{applications = Apps,
capabilities = Caps}
= Svc}}) ->
- erlang:monitor(process, Pid),
+ monitor(process, Pid),
wait(Ack, Pid),
{_, Seed} = diameter_lib:seed(),
random:seed(Seed),
@@ -246,11 +248,16 @@ handle_info(T, #watchdog{} = State) ->
event(T, State, S), %% before 'watchdog'
{noreply, S};
stop ->
- ?LOG(stop, T),
+ ?LOG(stop, truncate(T)),
event(T, State, State#watchdog{status = down}),
{stop, {shutdown, T}, State}
end.
+truncate({'DOWN' = T, _, process, Pid, _}) ->
+ {T, Pid};
+truncate(T) ->
+ T.
+
close({'DOWN', _, process, TPid, {shutdown, Reason}},
#watchdog{transport = TPid,
parent = Pid}) ->
@@ -447,11 +454,12 @@ transition({recv, TPid, Name, Pkt}, #watchdog{transport = TPid} = S) ->
%% Current watchdog has timed out.
transition({timeout, TRef, tw}, #watchdog{tref = TRef} = S) ->
- set_watchdog(timeout(S));
+ set_watchdog(0, timeout(S));
-%% Timer was canceled after message was already sent.
-transition({timeout, _, tw}, #watchdog{}) ->
- ok;
+%% Message has arrived since the timer was started: subtract time
+%% already elapsed from new timer.
+transition({timeout, _, tw}, #watchdog{tref = T0} = S) ->
+ set_watchdog(diameter_lib:micro_diff(T0) div 1000, S);
%% State query.
transition({state, Pid}, #watchdog{status = S}) ->
@@ -527,18 +535,27 @@ role() ->
%% set_watchdog/1
-set_watchdog(#watchdog{tw = TwInit,
- tref = TRef}
- = S) ->
- cancel(TRef),
- S#watchdog{tref = erlang:start_timer(tw(TwInit), self(), tw)};
+%% Timer not yet set.
+set_watchdog(#watchdog{tref = undefined} = S) ->
+ set_watchdog(0, S);
+
+%% Timer already set: start at new one only at expiry.
+set_watchdog(#watchdog{} = S) ->
+ S#watchdog{tref = diameter_lib:now()};
+
set_watchdog(stop = No) ->
No.
-cancel(undefined) ->
- ok;
-cancel(TRef) ->
- erlang:cancel_timer(TRef).
+%% set_watchdog/2
+
+set_watchdog(Ms, #watchdog{tw = TwInit} = S) ->
+ S#watchdog{tref = erlang:start_timer(tw(TwInit, Ms), self(), tw)}.
+
+%% A callback could return anything, so ensure the result isn't
+%% negative. Don't prevent abuse, even though the smallest valid
+%% timeout is 4000.
+tw(TwInit, Ms) ->
+ max(tw(TwInit) - Ms, 0).
tw(T)
when is_integer(T), T >= 6000 ->