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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (the "License"); you may not use this file except in
%% compliance with the License. You may obtain a copy of the License at
%% http://www.mozilla.org/MPL/
%%
%% 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.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developers of the Original Code are LShift Ltd,
%% Cohesive Financial Technologies LLC, and Rabbit Technologies Ltd.
%%
%% Portions created before 22-Nov-2008 00:00:00 GMT by LShift Ltd,
%% Cohesive Financial Technologies LLC, or Rabbit Technologies Ltd
%% are Copyright (C) 2007-2008 LShift Ltd, Cohesive Financial
%% Technologies LLC, and Rabbit Technologies Ltd.
%%
%% Portions created by LShift Ltd are Copyright (C) 2007-2009 LShift
%% Ltd. Portions created by Cohesive Financial Technologies LLC are
%% Copyright (C) 2007-2009 Cohesive Financial Technologies
%% LLC. Portions created by Rabbit Technologies Ltd are Copyright
%% (C) 2007-2009 Rabbit Technologies Ltd.
%%
%% All Rights Reserved.
%%
%% Contributor(s): ______________________________________.
%%
-module(rabbit_router).
-include("rabbit.hrl").
-behaviour(gen_server).
-export([start_link/0,
deliver/5]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-define(SERVER, ?MODULE).
%% cross-node routing optimisation is disabled because of bug 19758.
-define(BUG19758, true).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-spec(start_link/0 :: () -> {'ok', pid()} | 'ignore' | {'error', any()}).
-spec(deliver/5 :: ([pid()], bool(), bool(), maybe(txn()), message()) ->
{'ok', [pid()]} | {'error', 'unroutable' | 'not_delivered'}).
-endif.
%%----------------------------------------------------------------------------
start_link() ->
gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
-ifdef(BUG19758).
deliver(QPids, Mandatory, Immediate, Txn, Message) ->
check_delivery(Mandatory, Immediate,
run_bindings(QPids, Mandatory, Immediate, Txn, Message)).
-else.
deliver(QPids, Mandatory, Immediate, Txn, Message) ->
%% we reduce inter-node traffic by grouping the qpids by node and
%% only delivering one copy of the message to each node involved,
%% which then in turn delivers it to its queues.
deliver_per_node(
dict:to_list(
lists:foldl(
fun (QPid, D) ->
dict:update(node(QPid),
fun (QPids1) -> [QPid | QPids1] end,
[QPid], D)
end,
dict:new(), QPids)),
Mandatory, Immediate, Txn, Message).
deliver_per_node([{Node, QPids}], Mandatory, Immediate,
Txn, Message)
when Node == node() ->
%% optimisation
check_delivery(Mandatory, Immediate,
run_bindings(QPids, Mandatory, Immediate, Txn, Message));
deliver_per_node(NodeQPids, Mandatory = false, Immediate = false,
Txn, Message) ->
%% optimisation: when Mandatory = false and Immediate = false,
%% rabbit_amqqueue:deliver in run_bindings below will deliver the
%% message to the queue process asynchronously, and return true,
%% which means all the QPids will always be returned. It is
%% therefore safe to use a fire-and-forget cast here and return
%% the QPids - the semantics is preserved. This scales much better
%% than the non-immediate case below.
{ok, lists:flatmap(
fun ({Node, QPids}) ->
gen_server:cast(
{?SERVER, Node},
{deliver, QPids, Mandatory, Immediate, Txn, Message}),
QPids
end,
NodeQPids)};
deliver_per_node(NodeQPids, Mandatory, Immediate,
Txn, Message) ->
R = rabbit_misc:upmap(
fun ({Node, QPids}) ->
try gen_server:call(
{?SERVER, Node},
{deliver, QPids, Mandatory, Immediate, Txn, Message})
catch
_Class:_Reason ->
%% TODO: figure out what to log (and do!) here
{false, []}
end
end,
NodeQPids),
{Routed, Handled} =
lists:foldl(fun ({Routed, Handled}, {RoutedAcc, HandledAcc}) ->
{Routed or RoutedAcc,
%% we do the concatenation below, which
%% should be faster
[Handled | HandledAcc]}
end,
{false, []},
R),
check_delivery(Mandatory, Immediate, {Routed, lists:append(Handled)}).
-endif.
%%--------------------------------------------------------------------
init([]) ->
{ok, no_state}.
handle_call({deliver, QPids, Mandatory, Immediate, Txn, Message},
From, State) ->
spawn(
fun () ->
R = run_bindings(QPids, Mandatory, Immediate, Txn, Message),
gen_server:reply(From, R)
end),
{noreply, State}.
handle_cast({deliver, QPids, Mandatory, Immediate, Txn, Message},
State) ->
%% in order to preserve message ordering we must not spawn here
run_bindings(QPids, Mandatory, Immediate, Txn, Message),
{noreply, State}.
handle_info(_Info, State) ->
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%--------------------------------------------------------------------
run_bindings(QPids, IsMandatory, IsImmediate, Txn, Message) ->
lists:foldl(
fun (QPid, {Routed, Handled}) ->
case catch rabbit_amqqueue:deliver(IsMandatory, IsImmediate,
Txn, Message, QPid) of
true -> {true, [QPid | Handled]};
false -> {true, Handled};
{'EXIT', _Reason} -> {Routed, Handled}
end
end,
{false, []},
QPids).
%% check_delivery(Mandatory, Immediate, {WasRouted, QPids})
check_delivery(true, _ , {false, []}) -> {error, unroutable};
check_delivery(_ , true, {_ , []}) -> {error, not_delivered};
check_delivery(_ , _ , {_ , Qs}) -> {ok, Qs}.
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