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-rw-r--r--lib/diameter/src/base/diameter_peer_fsm.erl111
1 files changed, 49 insertions, 62 deletions
diff --git a/lib/diameter/src/base/diameter_peer_fsm.erl b/lib/diameter/src/base/diameter_peer_fsm.erl
index 5dab6214b1..de341741db 100644
--- a/lib/diameter/src/base/diameter_peer_fsm.erl
+++ b/lib/diameter/src/base/diameter_peer_fsm.erl
@@ -126,24 +126,17 @@
%% State Machine rather than closer to the transport. This is what we
%% now do below: connect/accept call diameter_watchdog and return the
%% pid of the watchdog process, and the watchdog in turn calls start/3
-%% below to start the process implementing the Peer State Machine. The
-%% former is a "peer" in diameter_service while the latter is a
-%% "conn". In a sense, diameter_service sees the watchdog as
-%% implementing the Peer State Machine and the process implemented
-%% here as being the transport, not being aware of the watchdog at
-%% all.
+%% below to start the process implementing the Peer State Machine.
%%
-%%% ---------------------------------------------------------------------------
-%%% # start({connect|accept, Ref}, Opts, Service)
-%%%
-%%% Output: Pid
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # start/3
+%% ---------------------------------------------------------------------------
-spec start(T, [Opt], {diameter:sequence(),
diameter:restriction(),
#diameter_service{}})
- -> pid()
+ -> {reference(), pid()}
when T :: {connect|accept, diameter:transport_ref()},
Opt :: diameter:transport_opt().
@@ -152,9 +145,15 @@
%% specified on the transport in question. Check here that the list is
%% still non-empty.
-start({_,_} = Type, Opts, MS) ->
- {ok, Pid} = diameter_peer_fsm_sup:start_child({self(), Type, Opts, MS}),
- Pid.
+start({_,_} = Type, Opts, S) ->
+ Ack = make_ref(),
+ T = {Ack, self(), Type, Opts, S},
+ {ok, Pid} = diameter_peer_fsm_sup:start_child(T),
+ try
+ {erlang:monitor(process, Pid), Pid}
+ after
+ Pid ! Ack
+ end.
start_link(T) ->
{ok, _} = proc_lib:start_link(?MODULE,
@@ -163,8 +162,8 @@ start_link(T) ->
infinity,
diameter_lib:spawn_opts(server, [])).
-%%% ---------------------------------------------------------------------------
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
%% init/1
@@ -172,12 +171,13 @@ init(T) ->
proc_lib:init_ack({ok, self()}),
gen_server:enter_loop(?MODULE, [], i(T)).
-i({WPid, T, Opts, {Mask, Nodes, #diameter_service{applications = Apps,
- capabilities = LCaps}
- = Svc}}) ->
- [] /= Apps orelse ?ERROR({no_apps, T, Opts}),
+i({Ack, WPid, {M, Ref} = T, Opts, {Mask,
+ Nodes,
+ #diameter_service{capabilities = LCaps}
+ = Svc}}) ->
+ erlang:monitor(process, WPid),
+ wait(Ack, WPid),
putr(?DWA_KEY, dwa(LCaps)),
- {M, Ref} = T,
diameter_stats:reg(Ref),
{[Cs,Ds], Rest} = proplists:split(Opts, [capabilities_cb, disconnect_cb]),
putr(?CB_KEY, {Ref, [F || {_,F} <- Cs]}),
@@ -185,7 +185,6 @@ i({WPid, T, Opts, {Mask, Nodes, #diameter_service{applications = Apps,
putr(?REF_KEY, Ref),
putr(?SEQUENCE_KEY, Mask),
putr(?RESTRICT_KEY, Nodes),
- erlang:monitor(process, WPid),
{TPid, Addrs} = start_transport(T, Rest, Svc),
Tmo = proplists:get_value(capx_timeout, Opts, ?EVENT_TIMEOUT),
?IS_TIMEOUT(Tmo) orelse ?ERROR({invalid, {capx_timeout, Tmo}}),
@@ -203,6 +202,16 @@ i({WPid, T, Opts, {Mask, Nodes, #diameter_service{applications = Apps,
%% watchdog start (start/2) succeeds regardless so as not to crash the
%% service.
+%% Wait for the caller to have a monitor to avoid a race with our
+%% death. (Since the exit reason is used in diameter_service.)
+wait(Ref, Pid) ->
+ receive
+ Ref ->
+ ok;
+ {'DOWN', _, process, Pid, _} = D ->
+ exit({shutdown, D})
+ end.
+
start_transport(T, Opts, #diameter_service{capabilities = LCaps} = Svc) ->
Addrs0 = LCaps#diameter_caps.host_ip_address,
start_transport(Addrs0, {T, Opts, Svc}).
@@ -274,13 +283,12 @@ handle_info(T, #state{} = State) ->
{noreply, S};
{stop, Reason} ->
?LOG(stop, Reason),
- x(Reason, State);
+ {stop, {shutdown, Reason}, State};
stop ->
?LOG(stop, T),
- x(T, State)
+ {stop, {shutdown, T}, State}
catch
exit: {diameter_codec, encode, _} = Reason ->
- close_wd(Reason, State#state.parent),
?LOG(stop, Reason),
%% diameter_codec:encode/2 emits an error report. Only
%% indicate the probable reason here.
@@ -300,10 +308,6 @@ handle_info(T, #state{} = State) ->
%% succesfully encoded. It's not checked at diameter:add_transport/2
%% since this can be called before creating the service.
-x(Reason, #state{} = S) ->
- close_wd(Reason, S),
- {stop, {shutdown, Reason}, S}.
-
%% terminate/2
terminate(_, _) ->
@@ -314,8 +318,8 @@ terminate(_, _) ->
code_change(_, State, _) ->
{ok, State}.
-%%% ---------------------------------------------------------------------------
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
putr(Key, Val) ->
put({?MODULE, Key}, Val).
@@ -378,9 +382,8 @@ transition({diameter, {recv, Pkt}}, S) ->
recv(Pkt, S);
%% Timeout when still in the same state ...
-transition({timeout = T, PS}, #state{state = PS} = S) ->
- close({capx(PS), T}, S),
- stop;
+transition({timeout = T, PS}, #state{state = PS}) ->
+ {stop, {capx(PS), T}};
%% ... or not.
transition({timeout, _}, _) ->
@@ -393,8 +396,6 @@ transition({send, Msg}, #state{transport = TPid}) ->
%% Request for graceful shutdown at remove_transport, stop_service of
%% application shutdown.
-transition({shutdown = T, Pid}, S) ->
- transition({T, Pid, transport}, S);
transition({shutdown, Pid, Reason}, #state{parent = Pid, dpr = false} = S) ->
dpr(Reason, S);
transition({shutdown, Pid, _}, #state{parent = Pid}) ->
@@ -459,7 +460,7 @@ send_CER(#state{state = {'Wait-Conn-Ack', Tmo},
OH = LCaps#diameter_caps.origin_host,
req_send_CER(OH, Remote)
orelse
- close({already_connected, Remote, LCaps}, S),
+ close({already_connected, Remote, LCaps}),
CER = build_CER(S),
?LOG(send, 'CER'),
#diameter_packet{header = #diameter_header{end_to_end_id = Eid,
@@ -692,17 +693,17 @@ cea(CEA, RC) ->
CEA#diameter_base_CEA{'Result-Code' = RC}.
post('CER' = T, RC, Pkt, S) ->
- [fun close/2, {T, caps(S), {RC, Pkt}}];
+ [fun(_) -> close({T, caps(S), {RC, Pkt}}) end];
post(_, _, _, _) ->
ok.
rejected({capabilities_cb, _F, Reason}, T, S) ->
rejected(Reason, T, S);
-rejected(discard, T, S) ->
- close(T, S);
+rejected(discard, T, _) ->
+ close(T);
rejected({N, Es}, T, S) ->
- {answer('CER', N, Es, S), [fun close/2, T]};
+ {answer('CER', N, Es, S), [fun(_) -> close(T) end]};
rejected(N, T, S) ->
rejected({N, []}, T, S).
@@ -862,7 +863,7 @@ handle_CEA(#diameter_packet{bin = Bin}
of
_ -> open(DPkt, SApps, Caps, {connect, hd([_] = IS)}, S)
catch
- ?FAILURE(Reason) -> close({'CEA', Reason, Caps, DPkt}, S)
+ ?FAILURE(Reason) -> close({'CEA', Reason, Caps, DPkt})
end.
%% Check more than the result code since the peer could send success
%% regardless. If not 2001 then a peer_up callback could do anything
@@ -882,7 +883,7 @@ recv_CEA(#diameter_packet{header = #diameter_header{version
T;
recv_CEA(Pkt, S) ->
- close({'CEA', caps(S), Pkt}, S).
+ close({'CEA', caps(S), Pkt}).
caps(#diameter_service{capabilities = Caps}) ->
Caps;
@@ -935,14 +936,14 @@ open(Pkt, SupportedApps, Caps, {Type, IS}, #state{parent = Pid,
%% We've advertised TLS support: tell the transport the result
%% and expect a reply when the handshake is complete.
-tls_ack(true, Caps, Type, IS, #state{transport = TPid} = S) ->
+tls_ack(true, Caps, Type, IS, #state{transport = TPid}) ->
Ref = make_ref(),
TPid ! {diameter, {tls, Ref, Type, IS == ?TLS}},
receive
{diameter, {tls, Ref}} ->
ok;
{'DOWN', _, process, TPid, Reason} ->
- close({tls_ack, Reason, Caps}, S)
+ close({tls_ack, Reason, Caps})
end;
%% Or not. Don't send anything to the transport so that transports
@@ -955,25 +956,11 @@ capz(#diameter_caps{} = L, #diameter_caps{} = R) ->
= list_to_tuple([diameter_caps | lists:zip(tl(tuple_to_list(L)),
tl(tuple_to_list(R)))]).
-%% close/2
+%% close/1
-%% Tell the watchdog that our death isn't due to transport failure.
-close(Reason, #state{parent = Pid}) ->
- close_wd(Reason, Pid),
+close(Reason) ->
throw({?MODULE, close, Reason}).
-%% close_wd/2
-
-%% Ensure the watchdog dies if DPR has been sent ...
-close_wd(_, #state{dpr = false}) ->
- ok;
-close_wd(Reason, #state{parent = Pid}) ->
- close_wd(Reason, Pid);
-
-%% ... or otherwise
-close_wd(Reason, Pid) ->
- Pid ! {close, self(), Reason}.
-
%% dwa/1
dwa(#diameter_caps{origin_host = OH,
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-04 20:32:19 +0000