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-rw-r--r--lib/diameter/src/transport/diameter_tcp.erl221
1 files changed, 51 insertions, 170 deletions
diff --git a/lib/diameter/src/transport/diameter_tcp.erl b/lib/diameter/src/transport/diameter_tcp.erl
index f745e2a6f7..c81701b624 100644
--- a/lib/diameter/src/transport/diameter_tcp.erl
+++ b/lib/diameter/src/transport/diameter_tcp.erl
@@ -19,7 +19,6 @@
%%
-module(diameter_tcp).
--dialyzer({no_fail_call, throttle/2}).
-behaviour(gen_server).
@@ -109,22 +108,19 @@
| gen_tcp:listen_option().
-type option() :: {port, non_neg_integer()}
- | {fragment_timer, 0..16#FFFFFFFF}
- | {throttle_cb, diameter:evaluable()}.
+ | {fragment_timer, 0..16#FFFFFFFF}.
%% Accepting/connecting transport process state.
-record(transport,
{socket :: inet:socket() | ssl:sslsocket(), %% accept/connect socket
parent :: pid(), %% of process that started us
module :: module(), %% gen_tcp-like module
- frag = <<>> :: frag(), %% message fragment
ssl :: [term()] | boolean(), %% ssl options, ssl or not
+ frag = <<>> :: frag(), %% message fragment
timeout :: infinity | 0..16#FFFFFFFF, %% fragment timeout
tref = false :: false | reference(), %% fragment timer reference
flush = false :: boolean(), %% flush fragment at timeout?
- throttle_cb :: false | diameter:evaluable(), %% ask to receive
- throttled :: boolean() | binary(), %% stopped receiving?
- monitor :: pid()}).
+ monitor :: pid()}). %% monitor/sender process
%% The usual transport using gen_tcp can be replaced by anything
%% sufficiently gen_tcp-like by passing a 'module' option as the first
@@ -213,30 +209,26 @@ i({T, Ref, Mod, Pid, Opts, Addrs, SPid})
%% Since accept/connect might block indefinitely, spawn a process
%% that kills us with the parent until call returns, and then
%% sends outgoing messages.
- {ok, MPid} = diameter_tcp_sup:start_child(#monitor{parent = Pid}),
{[SO|TO], Rest} = proplists:split(Opts, [ssl_options,
- fragment_timer,
- throttle_cb]),
+ fragment_timer]),
SslOpts = ssl_opts(SO),
OwnOpts = lists:append(TO),
Tmo = proplists:get_value(fragment_timer,
OwnOpts,
?DEFAULT_FRAGMENT_TIMEOUT),
?IS_TIMEOUT(Tmo) orelse ?ERROR({fragment_timer, Tmo}),
- Throttle = proplists:get_value(throttle_cb, OwnOpts, false),
+ {ok, MPid} = diameter_tcp_sup:start_child(#monitor{parent = Pid}),
Sock = init(T, Ref, Mod, Pid, SslOpts, Rest, Addrs, SPid),
M = if SslOpts -> ssl; true -> Mod end,
monitor(process, MPid),
MPid ! {start, self(), Sock, M}, %% prepare monitor for sending
putr(?REF_KEY, Ref),
- throttle(#transport{parent = Pid,
- module = M,
- socket = Sock,
- ssl = SslOpts,
- timeout = Tmo,
- throttle_cb = Throttle,
- throttled = false /= Throttle,
- monitor = MPid});
+ setopts(#transport{parent = Pid,
+ module = M,
+ socket = Sock,
+ ssl = SslOpts,
+ timeout = Tmo,
+ monitor = MPid});
%% Put the reference in the process dictionary since we now use it
%% advertise the ssl socket after TLS upgrade.
@@ -518,7 +510,7 @@ getr(Key) ->
%% Transition monitor state.
%% Outgoing message.
-m(Bin, #monitor{} = S)
+m(Bin, S)
when is_binary(Bin) ->
send(Bin, S),
S;
@@ -539,7 +531,7 @@ m({stop, TPid} = T, #monitor{transport = TPid}) ->
%% Transport is telling us that TLS has been negotiated after
%% capabilities exchange.
-m({tls, SSock}, #monitor{} = S) ->
+m({tls, SSock}, S) ->
S#monitor{socket = SSock,
module = ssl};
@@ -583,22 +575,14 @@ t(T,S) ->
%% transition/2
-%% Incoming message.
+%% Incoming packets.
transition({P, Sock, Bin}, #transport{socket = Sock,
- ssl = B,
- throttled = T}
+ ssl = B}
= S)
when P == ssl, true == B;
P == tcp ->
- false = T, %% assert
recv(Bin, S);
-%% Make a new throttling callback after a timeout.
-transition(throttle, #transport{throttled = false}) ->
- ok;
-transition(throttle, S) ->
- throttle(S);
-
%% Capabilties exchange has decided on whether or not to run over TLS.
transition({diameter, {tls, Ref, Type, B}}, #transport{parent = Pid}
= S) ->
@@ -607,7 +591,7 @@ transition({diameter, {tls, Ref, Type, B}}, #transport{parent = Pid}
= NS
= tls_handshake(Type, B, S),
Pid ! {diameter, {tls, Ref}},
- throttle(NS#transport{ssl = B});
+ NS#transport{ssl = B};
transition({C, Sock}, #transport{socket = Sock,
ssl = B})
@@ -623,8 +607,8 @@ transition({E, Sock, _Reason} = T, #transport{socket = Sock,
?ERROR({T,S});
%% Outgoing message.
-transition({diameter, {send, Bin}}, #transport{} = S) ->
- send(Bin, S),
+transition({diameter, {send, Msg}}, #transport{} = S) ->
+ send(Msg, S),
ok;
%% Request to close the transport connection.
@@ -703,24 +687,16 @@ tls(accept, Sock, Opts) ->
%% using Nagle.
%% Receive packets until a full message is received,
-recv(Bin, #transport{frag = Head, throttled = false} = S) ->
+recv(Bin, #transport{parent = Pid, frag = Head} = S) ->
case rcv(Head, Bin) of
- {Msg, B} ->
- throttle(S#transport{frag = B, throttled = Msg});
- Frag ->
- setopts(S),
- start_fragment_timer(S#transport{frag = Frag,
- flush = false})
+ {Msg, B} -> %% have a complete message ...
+ diameter_peer:recv(Pid, Msg),
+ recv(<<>>, S#transport{frag = B});
+ Frag -> %% read more on the socket
+ start_fragment_timer(setopts(S#transport{frag = Frag,
+ flush = false}))
end.
-%% recv/1
-
-recv(#transport{throttled = false} = S) ->
- recv(<<>>, S);
-
-recv(#transport{} = S) ->
- S.
-
%% rcv/2
%% No previous fragment.
@@ -780,13 +756,16 @@ recv1(Len, Bin) ->
<<Msg:Len/binary, Rest/binary>> = Bin,
{Msg, Rest}.
-%% bin/1-2
+%% bin/2
bin(Head, Acc) ->
list_to_binary([Head | lists:reverse(Acc)]).
+%% bin/1
+
bin({_, _, Head, Acc}) ->
bin(Head, Acc);
+
bin(Bin)
when is_binary(Bin) ->
Bin.
@@ -805,9 +784,7 @@ bin(Bin)
%% also eventually lead to watchdog failover.
%% No fragment to flush or not receiving messages.
-flush(#transport{frag = Frag, throttled = B} = S)
- when Frag == <<>>;
- B /= false ->
+flush(#transport{frag = <<>>} = S) ->
S;
%% Messages have been received since last timer expiry.
@@ -850,14 +827,11 @@ connect(Mod, Host, Port, Opts) ->
%% send/2
-send(Bin, #monitor{socket = Sock,
- module = M}) ->
- case send(M, Sock, Bin) of
- ok ->
- ok;
- {error, Reason} ->
- x({send, Reason})
- end;
+send(#diameter_packet{bin = Bin}, S) ->
+ send(Bin, S);
+
+send(Bin, #monitor{} = S) ->
+ send1(Bin, S);
%% Send from the monitor process to avoid deadlock if both the
%% receiver and the peer were to block in send.
@@ -865,6 +839,17 @@ send(Bin, #transport{monitor = MPid}) ->
MPid ! Bin,
MPid.
+%% send1/2
+
+send1(Bin, #monitor{socket = Sock,
+ module = M}) ->
+ case send(M, Sock, Bin) of
+ ok ->
+ ok;
+ {error, Reason} ->
+ x({send, Reason})
+ end.
+
%% send/3
send(gen_tcp, Sock, Bin) ->
@@ -885,116 +870,12 @@ setopts(M, Sock, Opts) ->
%% setopts/1
-setopts(#transport{socket = Sock, module = M}) ->
- setopts(M, Sock).
-
-%% setopts/2
-
-setopts(M, Sock) ->
+setopts(#transport{socket = Sock,
+ module = M}
+ = S)->
case setopts(M, Sock, [{active, once}]) of
- ok -> ok;
- X -> x({setopts, M, Sock, X}) %% possibly on peer disconnect
- end.
-
-%% throttle/1
-
-%% Still collecting packets for a complete message: keep receiving.
-throttle(#transport{throttled = false} = S) ->
- recv(S);
-
-%% Decide whether to receive another, or whether to accept a message
-%% that's been received.
-throttle(#transport{throttle_cb = F, throttled = T} = S) ->
- Res = cb(F, T),
-
- try throttle(Res, S) of
- #transport{ssl = SB} = NS when is_boolean(SB) ->
- throttle(defrag(NS));
- #transport{throttled = Msg} = NS when is_binary(Msg) ->
- %% Initial incoming message when we might need to upgrade
- %% to TLS: wait for reception of a tls tuple.
- defrag(NS)
- catch
- #transport{} = NS ->
- recv(NS)
- end.
-
-%% cb/2
-
-cb(false, _) ->
- ok;
-
-cb(F, B) ->
- diameter_lib:eval([F, true /= B andalso B]).
-
-%% throttle/2
-
-%% Callback says to receive another message.
-throttle(ok, #transport{throttled = true} = S) ->
- throw(S#transport{throttled = false});
-
-%% Callback says to accept a received message.
-throttle(ok, #transport{parent = Pid, throttled = Msg} = S)
- when is_binary(Msg) ->
- diameter_peer:recv(Pid, Msg),
- S;
-
-throttle({ok = T, F}, S) ->
- throttle(T, S#transport{throttle_cb = F});
-
-%% Callback says to accept a received message and acknowledged the
-%% returned pid with a {request, Pid} message if a request pid is
-%% spawned, a discard message otherwise. The latter does not mean that
-%% the message was necessarily discarded: it could have been an
-%% answer.
-throttle(NPid, #transport{parent = Pid, throttled = Msg} = S)
- when is_pid(NPid), is_binary(Msg) ->
- diameter_peer:recv(Pid, {Msg, NPid}),
- S;
-
-throttle({NPid, F}, #transport{throttled = Msg} = S)
- when is_pid(NPid), is_binary(Msg) ->
- throttle(NPid, S#transport{throttle_cb = F});
-
-%% Callback to accept a received message says to discard it.
-throttle(discard, #transport{throttled = Msg} = S)
- when is_binary(Msg) ->
- S;
-throttle({discard = T, F}, #transport{throttled = Msg} = S)
- when is_binary(Msg) ->
- throttle(T, S#transport{throttle_cb = F});
-
-%% Callback to accept a received message says to answer it with the
-%% supplied binary.
-throttle(Bin, #transport{throttled = Msg} = S)
- when is_binary(Bin), is_binary(Msg) ->
- send(Bin, S),
- S;
-throttle({Bin, F}, #transport{throttled = Msg} = S)
- when is_binary(Bin), is_binary(Msg) ->
- throttle(Bin, S#transport{throttle_cb = F});
-
-%% Callback says to ask again in the specified number of milliseconds.
-throttle({timeout, Tmo}, S) ->
- erlang:send_after(Tmo, self(), throttle),
- throw(S);
-throttle({timeout = T, Tmo, F}, S) ->
- throttle({T, Tmo}, S#transport{throttle_cb = F});
-
-throttle(T, #transport{throttle_cb = F}) ->
- ?ERROR({invalid_return, T, F}).
-
-%% defrag/1
-%%
-%% Try to extract another message from packets already read before
-%% another throttling callback.
-
-defrag(#transport{frag = Head} = S) ->
- case rcv(Head, <<>>) of
- {Msg, B} ->
- S#transport{throttled = Msg, frag = B};
- _ ->
- S#transport{throttled = true}
+ ok -> S;
+ X -> x({setopts, Sock, M, X}) %% possibly on peer disconnect
end.
%% portnr/2