diff options
Diffstat (limited to 'lib/diameter/src/base/diameter_traffic.erl')
| -rw-r--r-- | lib/diameter/src/base/diameter_traffic.erl | 283 |
1 files changed, 114 insertions, 169 deletions
diff --git a/lib/diameter/src/base/diameter_traffic.erl b/lib/diameter/src/base/diameter_traffic.erl index 2112941d5e..bc1ccf4feb 100644 --- a/lib/diameter/src/base/diameter_traffic.erl +++ b/lib/diameter/src/base/diameter_traffic.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 2013-2016. All Rights Reserved. +%% Copyright Ericsson AB 2013-2017. All Rights Reserved. %% %% Licensed under the Apache License, Version 2.0 (the "License"); %% you may not use this file except in compliance with the License. @@ -30,7 +30,7 @@ -export([send_request/4]). %% towards diameter_watchdog --export([receive_message/4]). +-export([receive_message/6]). %% towards diameter_peer_fsm and diameter_watchdog -export([incr/4, @@ -40,11 +40,11 @@ %% towards diameter_service -export([make_recvdata/1, peer_up/1, - peer_down/1, - pending/1]). + peer_down/1]). -%% towards ?MODULE --export([send/1]). %% send from remote node +%% internal +-export([send/1, %% send from remote node + init/1]). %% monitor process start -include_lib("diameter/include/diameter.hrl"). -include("diameter_internal.hrl"). @@ -57,14 +57,12 @@ -define(DEFAULT_TIMEOUT, 5000). %% for outgoing requests -define(DEFAULT_SPAWN_OPTS, []). -%% Table containing outgoing requests for which a reply has yet to be -%% received. +%% Table containing outgoing entries that live and die with +%% peer_up/down. The name is historic, since the table used to contain +%% information about outgoing requests for which an answer has yet to +%% be received. -define(REQUEST_TABLE, diameter_request). -%% Workaround for dialyzer's lack of understanding of match specs. --type match(T) - :: T | '_' | '$1' | '$2' | '$3' | '$4'. - %% Record diameter:call/4 options are parsed into. -record(options, {filter = none :: diameter:peer_filter(), @@ -72,7 +70,7 @@ timeout = ?DEFAULT_TIMEOUT :: 0..16#FFFFFFFF, detach = false :: boolean()}). -%% Term passed back to receive_message/4 with every incoming message. +%% Term passed back to receive_message/6 with every incoming message. -record(recvdata, {peerT :: ets:tid(), service_name :: diameter:service_name(), @@ -87,12 +85,12 @@ %% Record stored in diameter_request for each outgoing request. -record(request, - {ref :: match(reference()), %% used to receive answer - caller :: match(pid()), %% calling process - handler :: match(pid()), %% request process - transport :: match(pid()), %% peer process - caps :: match(#diameter_caps{}), %% of connection - packet :: match(#diameter_packet{})}). %% of request + {ref :: reference(), %% used to receive answer + caller :: pid() | undefined, %% calling process + handler :: pid(), %% request process + transport :: pid() | undefined, %% peer process + caps :: #diameter_caps{} | undefined, %% of connection + packet :: #diameter_packet{} | undefined}). %% of request %% --------------------------------------------------------------------------- %% # make_recvdata/1 @@ -113,18 +111,27 @@ make_recvdata([SvcName, PeerT, Apps, SvcOpts | _]) -> %% peer_up/1 %% --------------------------------------------------------------------------- -%% Insert an element that is used to detect whether or not there has -%% been a failover when inserting an outgoing request. +%% Start a process that dies with peer_down/1, on which request +%% processes can monitor. There is no other process that dies with +%% peer_down since failover doesn't imply the loss of transport in the +%% case of a watchdog transition into state SUSPECT. peer_up(TPid) -> - ets:insert(?REQUEST_TABLE, {TPid}). + proc_lib:start(?MODULE, init, [TPid]). + +init(TPid) -> + ets:insert(?REQUEST_TABLE, {TPid, self()}), + proc_lib:init_ack(self()), + proc_lib:hibernate(erlang, exit, [{shutdown, TPid}]). %% --------------------------------------------------------------------------- %% peer_down/1 %% --------------------------------------------------------------------------- peer_down(TPid) -> + [{_, Pid}] = ets:lookup(?REQUEST_TABLE, TPid), ets:delete(?REQUEST_TABLE, TPid), - failover(TPid). + Pid ! ok, %% make it die + Pid. %% --------------------------------------------------------------------------- %% incr/4 @@ -199,54 +206,25 @@ incr_rc(Dir, Pkt, TPid, Dict0) -> incr_rc(Dir, Pkt, TPid, {Dict0, Dict0, Dict0}). %% --------------------------------------------------------------------------- -%% pending/1 -%% --------------------------------------------------------------------------- - -pending(TPids) -> - MatchSpec = [{{'$1', - #request{caller = '$2', - handler = '$3', - transport = '$4', - _ = '_'}, - '_'}, - [?ORCOND([{'==', T, '$4'} || T <- TPids])], - [{{'$1', [{{caller, '$2'}}, - {{handler, '$3'}}, - {{transport, '$4'}}]}}]}], - - try - ets:select(?REQUEST_TABLE, MatchSpec) - catch - error: badarg -> [] %% service has gone down - end. - -%% --------------------------------------------------------------------------- -%% # receive_message/4 +%% # receive_message/6 %% %% Handle an incoming Diameter message. %% --------------------------------------------------------------------------- -%% Handle an incoming Diameter message in the watchdog process. This -%% used to come through the service process but this avoids that -%% becoming a bottleneck. +%% Handle an incoming Diameter message in the watchdog process. -receive_message(TPid, {Pkt, NPid}, Dict0, RecvData) -> - NPid ! {diameter, incoming(TPid, Pkt, Dict0, RecvData)}; +receive_message(TPid, Route, Pkt, false, Dict0, RecvData) -> + incoming(TPid, Route, Pkt, Dict0, RecvData); -receive_message(TPid, Pkt, Dict0, RecvData) -> - incoming(TPid, Pkt, Dict0, RecvData). +receive_message(TPid, Route, Pkt, NPid, Dict0, RecvData) -> + NPid ! {diameter, incoming(TPid, Route, Pkt, Dict0, RecvData)}. %% incoming/4 -incoming(TPid, Pkt, Dict0, RecvData) +incoming(TPid, Route, Pkt, Dict0, RecvData) when is_pid(TPid) -> #diameter_packet{header = #diameter_header{is_request = R}} = Pkt, - recv(R, - (not R) andalso lookup_request(Pkt, TPid), - TPid, - Pkt, - Dict0, - RecvData). + recv(R, Route, TPid, Pkt, Dict0, RecvData). %% recv/6 @@ -261,8 +239,8 @@ recv(true, false, TPid, Pkt, Dict0, T) -> end; %% ... answer to known request ... -recv(false, #request{ref = Ref, handler = Pid} = Req, _, Pkt, Dict0, _) -> - Pid ! {answer, Ref, Req, Dict0, Pkt}, +recv(false, {Pid, Ref, TPid}, _, Pkt, Dict0, _) -> + Pid ! {answer, Ref, TPid, Dict0, Pkt}, {answer, Pid}; %% Note that failover could have happened prior to this message being @@ -911,7 +889,7 @@ failed(Rec, FailedAvp, Dict) -> {'Failed-AVP', [FailedAvp]} catch error: _ -> - Avps = Dict:'get-'('AVP', Rec), + Avps = Dict:'#get-'('AVP', Rec), A = #diameter_avp{name = 'Failed-AVP', value = FailedAvp}, {'AVP', [A|Avps]} @@ -1452,7 +1430,7 @@ make_request_packet(#diameter_packet{header = Hdr} = Pkt, make_request_packet(Msg, Pkt) -> Pkt#diameter_packet{msg = Msg}. -%% make_retransmit_packet/2 +%% make_retransmit_packet/1 make_retransmit_packet(#diameter_packet{msg = [#diameter_header{} = Hdr | Avps]} @@ -1495,32 +1473,39 @@ send_R(Pkt0, packet = Pkt0}, incr(send, Pkt, TPid, AppDict), - TRef = send_request(TPid, Pkt, Req, SvcName, Timeout), + {TRef, MRef} = zend_requezt(TPid, Pkt, Req, SvcName, Timeout), Pid ! Ref, %% tell caller a send has been attempted handle_answer(SvcName, App, - recv_A(Timeout, SvcName, App, Opts, {TRef, Req})). + recv_A(Timeout, SvcName, App, Opts, {TRef, MRef, Req})). %% recv_A/5 -recv_A(Timeout, SvcName, App, Opts, {TRef, #request{ref = Ref} = Req}) -> +recv_A(Timeout, SvcName, App, Opts, {TRef, MRef, #request{ref = Ref} = Req}) -> %% Matching on TRef below ensures we ignore messages that pertain %% to a previous transport prior to failover. The answer message - %% includes the #request{} since it's not necessarily Req; that - %% is, from the last peer to which we've transmitted. + %% includes the pid of the transport on which it was received, + %% which may not be the last peer to which we've transmitted. receive - {answer = A, Ref, Rq, Dict0, Pkt} -> %% Answer from peer - {A, Rq, Dict0, Pkt}; + {answer = A, Ref, TPid, Dict0, Pkt} -> %% Answer from peer + {A, #request{} = erase(TPid), Dict0, Pkt}; {timeout = Reason, TRef, _} -> %% No timely reply {error, Req, Reason}; - {failover, TRef} -> %% Service says peer has gone down - retransmit(pick_peer(SvcName, App, Req, Opts), - Req, - Opts, - SvcName, - Timeout) + {'DOWN', MRef, process, _, _} when false /= MRef -> %% local peer_down + failover(SvcName, App, Req, Opts, Timeout); + {failover, TRef} -> %% local or remote peer_down + failover(SvcName, App, Req, Opts, Timeout) end. +%% failover/5 + +failover(SvcName, App, Req, Opts, Timeout) -> + retransmit(pick_peer(SvcName, App, Req, Opts), + Req, + Opts, + SvcName, + Timeout). + %% handle_answer/3 handle_answer(SvcName, App, {error, Req, Reason}) -> @@ -1697,47 +1682,63 @@ encode(DictT, TPid, #diameter_packet{bin = undefined} = Pkt) -> encode(_, _, #diameter_packet{} = Pkt) -> Pkt. +%% zend_requezt/5 +%% +%% Strip potentially large record fields that aren't used by the +%% processes the records can be send to, possibly on a remote node. + +zend_requezt(TPid, Pkt, Req, SvcName, Timeout) -> + put(TPid, Req), + send_request(TPid, z(Pkt), Req, SvcName, Timeout). + %% send_request/5 send_request(TPid, #diameter_packet{bin = Bin} = Pkt, Req, _SvcName, Timeout) when node() == node(TPid) -> Seqs = diameter_codec:sequence_numbers(Bin), TRef = erlang:start_timer(Timeout, self(), TPid), - Entry = {Seqs, Req, TRef}, - - %% Ensure that request table is cleaned even if we receive an exit - %% signal. An alternative would be to simply trap exits, but - %% callbacks are applied in this process, and these could possibly - %% be expecting the prevailing behaviour. - Self = self(), - spawn(fun() -> diameter_lib:wait([Self]), erase_request(Entry) end), - - store_request(Entry, TPid), - send(TPid, Pkt), - TRef; + send(TPid, Pkt, _Route = {self(), Req#request.ref, Seqs}), + {TRef, _MRef = peer_monitor(TPid, TRef)}; %% Send using a remote transport: spawn a process on the remote node %% to relay the answer. send_request(TPid, #diameter_packet{} = Pkt, Req, SvcName, Timeout) -> TRef = erlang:start_timer(Timeout, self(), TPid), - T = {TPid, Pkt, Req, SvcName, Timeout, TRef}, + T = {TPid, Pkt, z(Req), SvcName, Timeout, TRef}, spawn(node(TPid), ?MODULE, send, [T]), - TRef. + {TRef, false}. + +%% z/1 +%% +%% Avoid sending potentially large terms unnecessarily. The records +%% themselves are retained since they're sent between nodes in send/1 +%% and changing what's sent causes upgrade issues. + +z(#request{ref = Ref, handler = Pid}) -> + #request{ref = Ref, + handler = Pid}; + +z(#diameter_packet{header = H, bin = Bin, transport_data = T}) -> + #diameter_packet{header = H, + bin = Bin, + transport_data = T}. %% send/1 send({TPid, Pkt, #request{handler = Pid} = Req0, SvcName, Timeout, TRef}) -> Req = Req0#request{handler = self()}, - recv(TPid, Pid, TRef, send_request(TPid, Pkt, Req, SvcName, Timeout)). + recv(TPid, Pid, TRef, zend_requezt(TPid, Pkt, Req, SvcName, Timeout)). %% recv/4 %% %% Relay an answer from a remote node. -recv(TPid, Pid, TRef, LocalTRef) -> +recv(TPid, Pid, TRef, {LocalTRef, MRef}) -> receive {answer, _, _, _, _} = A -> Pid ! A; + {'DOWN', MRef, process, _, _} -> + Pid ! {failover, TRef}; {failover = T, LocalTRef} -> Pid ! {T, TRef}; T -> @@ -1746,14 +1747,13 @@ recv(TPid, Pid, TRef, LocalTRef) -> %% send/2 -send(Pid, Pkt) -> %% Strip potentially large message terms. - #diameter_packet{header = H, - bin = Bin, - transport_data = T} - = Pkt, - Pid ! {send, #diameter_packet{header = H, - bin = Bin, - transport_data = T}}. +send(Pid, Pkt) -> + Pid ! {send, Pkt}. + +%% send/3 + +send(Pid, Pkt, Route) -> + Pid ! {send, Pkt, Route}. %% retransmit/4 @@ -1763,8 +1763,8 @@ retransmit({TPid, Caps, App} = Req, SvcName, Timeout) -> - have_request(Pkt0, TPid) %% Don't failover to a peer we've - andalso ?THROW(timeout), %% already sent to. + undefined == get(TPid) %% Don't failover to a peer we've + orelse ?THROW(timeout), %% already sent to. Pkt = make_retransmit_packet(Pkt0), @@ -1774,6 +1774,8 @@ retransmit({TPid, Caps, App} SvcName, Timeout, []). +%% When sending a binary, it's up to prepare_retransmit to modify it +%% accordingly. retransmit({send, Msg}, Transport, @@ -1815,77 +1817,20 @@ resend_request(Pkt0, ?LOG(retransmission, Pkt#diameter_packet.header), incr(TPid, {msg_id(Pkt, AppDict), send, retransmission}), - TRef = send_request(TPid, Pkt, Req, SvcName, Tmo), - {TRef, Req}. + {TRef, MRef} = zend_requezt(TPid, Pkt, Req, SvcName, Tmo), + {TRef, MRef, Req}. -%% store_request/2 +%% peer_monitor/2 -store_request(T, TPid) -> - ets:insert(?REQUEST_TABLE, T), - ets:member(?REQUEST_TABLE, TPid) - orelse begin - {_Seqs, _Req, TRef} = T, - self() ! {failover, TRef} %% failover/1 may have missed - end. - -%% lookup_request/2 -%% -%% Note the match on both the key and transport pid. The latter is -%% necessary since the same Hop-by-Hop and End-to-End identifiers are -%% reused in the case of retransmission. - -lookup_request(Msg, TPid) -> - Seqs = diameter_codec:sequence_numbers(Msg), - Spec = [{{Seqs, #request{transport = TPid, _ = '_'}, '_'}, - [], - ['$_']}], - case ets:select(?REQUEST_TABLE, Spec) of - [{_, Req, _}] -> - Req; - [] -> +peer_monitor(TPid, TRef) -> + case ets:lookup(?REQUEST_TABLE, TPid) of %% at peer_up/1 + [{_, MPid}] -> + monitor(process, MPid); + [] -> %% transport has gone down + self() ! {failover, TRef}, false end. -%% erase_request/1 - -erase_request(T) -> - ets:delete_object(?REQUEST_TABLE, T). - -%% match_requests/1 - -match_requests(TPid) -> - Pat = {'_', #request{transport = TPid, _ = '_'}, '_'}, - ets:select(?REQUEST_TABLE, [{Pat, [], ['$_']}]). - -%% have_request/2 - -have_request(Pkt, TPid) -> - Seqs = diameter_codec:sequence_numbers(Pkt), - Pat = {Seqs, #request{transport = TPid, _ = '_'}, '_'}, - '$end_of_table' /= ets:select(?REQUEST_TABLE, [{Pat, [], ['$_']}], 1). - -%% --------------------------------------------------------------------------- -%% # failover/1-2 -%% --------------------------------------------------------------------------- - -failover(TPid) - when is_pid(TPid) -> - lists:foreach(fun failover/1, match_requests(TPid)); -%% Note that a request process can store its request after failover -%% notifications are sent here: store_request/2 sends the notification -%% in that case. - -%% Failover as a consequence of peer_down/1: inform the -%% request process. -failover({_, Req, TRef}) -> - #request{handler = Pid, - packet = #diameter_packet{msg = M}} - = Req, - M /= undefined andalso (Pid ! {failover, TRef}). -%% Failover is not performed when msg = binary() since sending -%% pre-encoded binaries is only partially supported. (Mostly for -%% test.) - %% get_destination/2 get_destination(Dict, Msg) -> |