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authorAnders Svensson <[email protected]>2017-06-12 21:54:50 +0200
committerAnders Svensson <[email protected]>2017-06-13 15:30:24 +0200
commitfd2850798f68c9a3c502ad9d66ef46561816ab6f (patch)
treec1f561e711cba38f62cad9ab547f695f0d6d7bdc /lib/diameter/src/base/diameter_traffic.erl
parent205521d3927ed6f53c9a6fa3095f8a879bdca929 (diff)
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Let spawn_opt config replace erlang:spawn_opt/2 for request processes
By accepting an MFA that is applied to the fun that is otherwise spawned for each incoming request, to allow handler processes to be reused. This is not yet documented and may change, but the motivation is to let spawn be replaced by process pool, from which the MFA selects. A list-valued spawn_opt is equivalent to {erlang, spawn_opt, [Opts]}.
Diffstat (limited to 'lib/diameter/src/base/diameter_traffic.erl')
-rw-r--r--lib/diameter/src/base/diameter_traffic.erl42
1 files changed, 36 insertions, 6 deletions
diff --git a/lib/diameter/src/base/diameter_traffic.erl b/lib/diameter/src/base/diameter_traffic.erl
index 54f39afbf0..af7ac10f13 100644
--- a/lib/diameter/src/base/diameter_traffic.erl
+++ b/lib/diameter/src/base/diameter_traffic.erl
@@ -212,8 +212,9 @@ incr_rc(Dir, Pkt, TPid, Dict0) ->
%% ---------------------------------------------------------------------------
-spec receive_message(pid(), Route, #diameter_packet{}, module(), RecvData)
- -> pid()
- | boolean()
+ -> pid() %% request handler
+ | boolean() %% answer, known request or not
+ | discard %% request discarded by MFA
when Route :: {Handler, RequestRef, Seqs}
| Ack,
RecvData :: {[SpawnOpt], #recvdata{}},
@@ -230,9 +231,10 @@ receive_message(TPid, Route, Pkt, Dict0, RecvData) ->
%% recv/6
%% Incoming request ...
-recv(true, Ack, TPid, Pkt, Dict0, RecvData)
+recv(true, Ack, TPid, Pkt, Dict0, T)
when is_boolean(Ack) ->
- spawn_request(Ack, TPid, Pkt, Dict0, RecvData);
+ {Opts, RecvData} = T,
+ spawn_request(Ack, TPid, Pkt, Dict0, RecvData, Opts);
%% ... answer to known request ...
recv(false, {Pid, Ref, TPid}, _, Pkt, Dict0, _) ->
@@ -254,18 +256,46 @@ recv(false, false, TPid, Pkt, _, _) ->
incr(TPid, {{unknown, 0}, recv, discarded}),
false.
-%% spawn_request/5
+%% spawn_request/6
-spawn_request(Ack, TPid, Pkt, Dict0, {Opts, RecvData}) ->
+%% An MFA should return a pid() or the atom 'discard'. The latter
+%% results in an acknowledgment back to the transport process when
+%% appropriate, to ensure that send/recv callbacks can count
+%% outstanding requests. Acknowledgement is implicit if the
+%% handler process dies (in a handle_request callback for example).
+spawn_request(Ack, TPid, Pkt, Dict0, RecvData, {M,F,A}) ->
+ ReqF = fun() ->
+ ack(Ack, TPid, recv_request(Ack, TPid, Pkt, Dict0, RecvData))
+ end,
+ ack(Ack, TPid, apply(M, F, [ReqF | A]));
+
+%% A spawned process acks implicitly when it dies, so there's no need
+%% to handle 'discard'.
+spawn_request(Ack, TPid, Pkt, Dict0, RecvData, Opts) ->
spawn_opt(fun() ->
recv_request(Ack, TPid, Pkt, Dict0, RecvData)
end,
Opts).
+%% ack/3
+
+ack(Ack, TPid, RC) ->
+ RC == discard andalso Ack andalso (TPid ! {send, false}),
+ RC.
+
%% ---------------------------------------------------------------------------
%% recv_request/5
%% ---------------------------------------------------------------------------
+-spec recv_request(Ack :: boolean(),
+ TPid :: pid(),
+ #diameter_packet{},
+ Dict0 :: module(),
+ #recvdata{})
+ -> ok %% answer was sent
+ | discard %% or not
+ | false. %% no transport
+
recv_request(Ack,
TPid,
#diameter_packet{header = #diameter_header{application_id = Id}}