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Diffstat (limited to 'lib/diameter/test/diameter_gen_sctp_SUITE.erl')
| -rw-r--r-- | lib/diameter/test/diameter_gen_sctp_SUITE.erl | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/lib/diameter/test/diameter_gen_sctp_SUITE.erl b/lib/diameter/test/diameter_gen_sctp_SUITE.erl new file mode 100644 index 0000000000..be6d28beb2 --- /dev/null +++ b/lib/diameter/test/diameter_gen_sctp_SUITE.erl @@ -0,0 +1,354 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2010-2011. All Rights Reserved. +%% +%% The contents of this file are subject to the Erlang Public License, +%% Version 1.1, (the "License"); you may not use this file except in +%% compliance with the License. You should have received a copy of the +%% Erlang Public License along with this software. If not, it can be +%% retrieved online at http://www.erlang.org/. +%% +%% Software distributed under the License is distributed on an "AS IS" +%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See +%% the License for the specific language governing rights and limitations +%% under the License. +%% +%% %CopyrightEnd% +%% + +%% +%% Some gen_sctp-specific tests demonstrating problems that were +%% encountered during diameter development but have nothing +%% specifically to do with diameter. At least one of them can cause +%% diameter_transport_SUITE testcases to fail. +%% + +-module(diameter_gen_sctp_SUITE). + +-export([suite/0, + all/0, + init_per_suite/1, + end_per_suite/1]). + +%% testcases +-export([send_not_from_controlling_process/1, + send_from_multiple_clients/1, + receive_what_was_sent/1]). + +-include_lib("kernel/include/inet_sctp.hrl"). + +%% Message from gen_sctp are of this form. +-define(SCTP(Sock, Data), {sctp, Sock, _, _, Data}). + +%% Open sockets on the loopback address. +-define(ADDR, {127,0,0,1}). + +%% Snooze, nap, siesta. +-define(SLEEP(T), receive after T -> ok end). + +%% An indescribably long number of milliseconds after which everthing +%% that should have happened has. +-define(FOREVER, 2000). + +%% The first byte in each message we send as a simple guard against +%% not receiving what was sent. +-define(MAGIC, 42). + +%% =========================================================================== + +suite() -> + [{timetrap, {minutes, 2}}]. + +all() -> + [send_not_from_controlling_process, + send_from_multiple_clients, + receive_what_was_sent]. + +init_per_suite(Config) -> + try gen_sctp:open() of + {ok, Sock} -> + gen_sctp:close(Sock), + Config + catch + error: badarg -> + {skip, no_sctp} + end. + +end_per_suite(_Config) -> + ok. + +%% =========================================================================== + +%% send_not_from_controlling_process/1 +%% +%% This testcase failing shows gen_sctp:send/4 hanging when called +%% outside the controlling process of the socket in question. + +send_not_from_controlling_process(_) -> + Pids = send_not_from_controlling_process(), + ?SLEEP(?FOREVER), + try + [] = [{P,I} || P <- Pids, I <- [process_info(P)], I /= undefined] + after + lists:foreach(fun(P) -> exit(P, kill) end, Pids) + end. + +%% send_not_from_controlling_process/0 +%% +%% Returns the pids of three spawned processes: a listening process, a +%% connecting process and a sending process. +%% +%% The expected behaviour is that all three processes exit: +%% +%% - The listening process exits upon receiving an SCTP message +%% sent by the sending process. +%% - The connecting process exits upon listening process exit. +%% - The sending process exits upon gen_sctp:send/4 return. +%% +%% The observed behaviour is that all three processes remain alive +%% indefinitely: +%% +%% - The listening process never receives the SCTP message sent +%% by the sending process. +%% - The connecting process has an inet_reply message in its mailbox +%% as a consequence of the call to gen_sctp:send/4 call from the +%% sending process. +%% - The call to gen_sctp:send/4 in the sending process doesn't return, +%% hanging in prim_inet:getopts/2. + +send_not_from_controlling_process() -> + FPid = self(), + {L, MRef} = spawn_monitor(fun() -> listen(FPid) end),%% listening process + receive + {?MODULE, C, S} -> + erlang:demonitor(MRef, [flush]), + [L,C,S]; + {'DOWN', MRef, process, _, _} = T -> + error(T) + end. + +%% listen/1 + +listen(FPid) -> + {ok, Sock} = open(), + ok = gen_sctp:listen(Sock, true), + {ok, PortNr} = inet:port(Sock), + LPid = self(), + spawn(fun() -> connect1(PortNr, FPid, LPid) end), %% connecting process + Id = assoc(Sock), + ?SCTP(Sock, {[#sctp_sndrcvinfo{assoc_id = Id}], _Bin}) + = recv(). %% Waits with this as current_function. + +%% recv/0 + +recv() -> + receive T -> T end. + +%% connect1/3 + +connect1(PortNr, FPid, LPid) -> + {ok, Sock} = open(), + ok = gen_sctp:connect_init(Sock, ?ADDR, PortNr, []), + Id = assoc(Sock), + FPid ! {?MODULE, + self(), + spawn(fun() -> send(Sock, Id) end)}, %% sending process + MRef = erlang:monitor(process, LPid), + down(MRef). %% Waits with this as current_function. + +%% down/1 + +down(MRef) -> + receive {'DOWN', MRef, process, _, Reason} -> Reason end. + +%% send/2 + +send(Sock, Id) -> + ok = gen_sctp:send(Sock, Id, 0, <<0:32>>). + +%% =========================================================================== + +%% send_from_multiple_clients/0 +%% +%% Demonstrates sluggish delivery of messages. + +send_from_multiple_clients(_) -> + {S, Rs} = T = send_from_multiple_clients(8, 1024), + {false, [], _} = {?FOREVER < S, + Rs -- [OI || {O,_} = OI <- Rs, is_integer(O)], + T}. + +%% send_from_multiple_clients/2 +%% +%% Opens a listening socket and then spawns a specified number of +%% processes, each of which connects to the listening socket. Each +%% connecting process then sends a message, whose size in bytes is +%% passed as an argument, the listening process sends a reply +%% containing the time at which the message was received, and the +%% connecting process then exits upon reception of this reply. +%% +%% Returns the elapsed time for all connecting process to exit +%% together with a list of exit reasons for the connecting processes. +%% In the successful case a connecting process exits with the +%% outbound/inbound transit times for the sent/received message as +%% reason. +%% +%% The observed behaviour is that some outbound messages (that is, +%% from a connecting process to the listening process) can take an +%% unexpectedly long time to complete their journey. The more +%% connecting processes, the longer the possible delay it seems. +%% +%% eg. (With F = fun send_from_multiple_clients/2.) +%% +%% 5> F(2, 1024). +%% {875,[{128,116},{113,139}]} +%% 6> F(4, 1024). +%% {2995290,[{2994022,250},{2994071,80},{200,130},{211,113}]} +%% 7> F(8, 1024). +%% {8997461,[{8996161,116}, +%% {2996471,86}, +%% {2996278,116}, +%% {2996360,95}, +%% {246,112}, +%% {213,159}, +%% {373,173}, +%% {376,118}]} +%% 8> F(8, 1024). +%% {21001891,[{20999968,128}, +%% {8997891,172}, +%% {8997927,91}, +%% {2995716,164}, +%% {2995860,87}, +%% {134,100}, +%% {117,98}, +%% {149,125}]} + +send_from_multiple_clients(N, Sz) + when is_integer(N), 0 < N, is_integer(Sz), 0 < Sz -> + timer:tc(fun listen/2, [N, <<?MAGIC, 0:Sz/unit:8>>]). + +%% listen/2 + +listen(N, Bin) -> + {ok, Sock} = open(), + ok = gen_sctp:listen(Sock, true), + {ok, PortNr} = inet:port(Sock), + + %% Spawn a middleman that in turn spawns N connecting processes, + %% collects a list of exit reasons and then exits with the list as + %% reason. loop/3 returns when we receive this list from the + %% middleman's 'DOWN'. + + Self = self(), + Fun = fun() -> exit(connect2(Self, PortNr, Bin)) end, + {_, MRef} = spawn_monitor(fun() -> exit(fold(N, Fun)) end), + loop(Sock, MRef, Bin). + +%% fold/2 +%% +%% Spawn N processes and collect their exit reasons in a list. + +fold(N, Fun) -> + start(N, Fun), + acc(N, []). + +start(0, _) -> + ok; +start(N, Fun) -> + spawn_monitor(Fun), + start(N-1, Fun). + +acc(0, Acc) -> + Acc; +acc(N, Acc) -> + receive + {'DOWN', _MRef, process, _, RC} -> + acc(N-1, [RC | Acc]) + end. + +%% loop/3 + +loop(Sock, MRef, Bin) -> + receive + ?SCTP(Sock, {[#sctp_sndrcvinfo{assoc_id = Id}], B}) -> + Sz = size(Bin), + {Sz, Bin} = {size(B), B}, %% assert + ok = send(Sock, Id, mark(Bin)), + loop(Sock, MRef, Bin); + ?SCTP(Sock, _) -> + loop(Sock, MRef, Bin); + {'DOWN', MRef, process, _, Reason} -> + Reason + end. + +%% connect2/3 + +connect2(Pid, PortNr, Bin) -> + erlang:monitor(process, Pid), + + {ok, Sock} = open(), + ok = gen_sctp:connect_init(Sock, ?ADDR, PortNr, []), + Id = assoc(Sock), + + %% T1 = time before send + %% T2 = time after listening process received our message + %% T3 = time after reply is received + + T1 = now(), + ok = send(Sock, Id, Bin), + T2 = unmark(recv(Sock, Id)), + T3 = now(), + {timer:now_diff(T2, T1), timer:now_diff(T3, T2)}. %% {Outbound, Inbound} + +%% recv/2 + +recv(Sock, Id) -> + receive + ?SCTP(Sock, {[#sctp_sndrcvinfo{assoc_id = Id}], Bin}) -> + Bin; + T -> %% eg. 'DOWN' + exit(T) + end. + +%% send/3 + +send(Sock, Id, Bin) -> + gen_sctp:send(Sock, Id, 0, Bin). + +%% mark/1 + +mark(Bin) -> + Info = term_to_binary(now()), + <<Info/binary, Bin/binary>>. + +%% unmark/1 + +unmark(Bin) -> + {_,_,_} = binary_to_term(Bin). + +%% =========================================================================== + +%% receive_what_was_sent/1 +%% +%% Demonstrates reception of a message that differs from that sent. + +receive_what_was_sent(_Config) -> + send_from_multiple_clients(1, 1024*32). %% fails + +%% =========================================================================== + +%% open/0 + +open() -> + gen_sctp:open([{ip, ?ADDR}, {port, 0}, {active, true}, binary]). + +%% assoc/1 + +assoc(Sock) -> + receive + ?SCTP(Sock, {[], #sctp_assoc_change{state = S, + assoc_id = Id}}) -> + comm_up = S, %% assert + Id + end. |