%% 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 Developer of the Original Code is VMware, Inc. %% Copyright (c) 2007-2012 VMware, Inc. All rights reserved. %% -module(rabbit_channel). -include("rabbit_framing.hrl"). -include("rabbit.hrl"). -behaviour(gen_server2). -export([start_link/11, do/2, do/3, do_flow/3, flush/1, shutdown/1]). -export([send_command/2, deliver/4, flushed/2]). -export([list/0, info_keys/0, info/1, info/2, info_all/0, info_all/1]). -export([refresh_config_local/0, ready_for_close/1]). -export([force_event_refresh/0]). -export([init/1, terminate/2, code_change/3, handle_call/3, handle_cast/2, handle_info/2, handle_pre_hibernate/1, prioritise_call/3, prioritise_cast/2, prioritise_info/2, format_message_queue/2]). %% Internal -export([list_local/0]). -record(ch, {state, protocol, channel, reader_pid, writer_pid, conn_pid, conn_name, limiter, tx_status, next_tag, unacked_message_q, uncommitted_message_q, uncommitted_acks, uncommitted_nacks, user, virtual_host, most_recently_declared_queue, queue_monitors, consumer_mapping, blocking, queue_consumers, queue_collector_pid, stats_timer, confirm_enabled, publish_seqno, unconfirmed, confirmed, capabilities, trace_state}). -define(MAX_PERMISSION_CACHE_SIZE, 12). -define(STATISTICS_KEYS, [pid, transactional, confirm, consumer_count, messages_unacknowledged, messages_unconfirmed, messages_uncommitted, acks_uncommitted, prefetch_count, client_flow_blocked]). -define(CREATION_EVENT_KEYS, [pid, name, connection, number, user, vhost]). -define(INFO_KEYS, ?CREATION_EVENT_KEYS ++ ?STATISTICS_KEYS -- [pid]). %%---------------------------------------------------------------------------- -ifdef(use_specs). -export_type([channel_number/0]). -type(channel_number() :: non_neg_integer()). -spec(start_link/11 :: (channel_number(), pid(), pid(), pid(), string(), rabbit_types:protocol(), rabbit_types:user(), rabbit_types:vhost(), rabbit_framing:amqp_table(), pid(), rabbit_limiter:token()) -> rabbit_types:ok_pid_or_error()). -spec(do/2 :: (pid(), rabbit_framing:amqp_method_record()) -> 'ok'). -spec(do/3 :: (pid(), rabbit_framing:amqp_method_record(), rabbit_types:maybe(rabbit_types:content())) -> 'ok'). -spec(do_flow/3 :: (pid(), rabbit_framing:amqp_method_record(), rabbit_types:maybe(rabbit_types:content())) -> 'ok'). -spec(flush/1 :: (pid()) -> 'ok'). -spec(shutdown/1 :: (pid()) -> 'ok'). -spec(send_command/2 :: (pid(), rabbit_framing:amqp_method_record()) -> 'ok'). -spec(deliver/4 :: (pid(), rabbit_types:ctag(), boolean(), rabbit_amqqueue:qmsg()) -> 'ok'). -spec(flushed/2 :: (pid(), pid()) -> 'ok'). -spec(list/0 :: () -> [pid()]). -spec(list_local/0 :: () -> [pid()]). -spec(info_keys/0 :: () -> rabbit_types:info_keys()). -spec(info/1 :: (pid()) -> rabbit_types:infos()). -spec(info/2 :: (pid(), rabbit_types:info_keys()) -> rabbit_types:infos()). -spec(info_all/0 :: () -> [rabbit_types:infos()]). -spec(info_all/1 :: (rabbit_types:info_keys()) -> [rabbit_types:infos()]). -spec(refresh_config_local/0 :: () -> 'ok'). -spec(ready_for_close/1 :: (pid()) -> 'ok'). -spec(force_event_refresh/0 :: () -> 'ok'). -endif. %%---------------------------------------------------------------------------- start_link(Channel, ReaderPid, WriterPid, ConnPid, ConnName, Protocol, User, VHost, Capabilities, CollectorPid, Limiter) -> gen_server2:start_link( ?MODULE, [Channel, ReaderPid, WriterPid, ConnPid, ConnName, Protocol, User, VHost, Capabilities, CollectorPid, Limiter], []). do(Pid, Method) -> do(Pid, Method, none). do(Pid, Method, Content) -> gen_server2:cast(Pid, {method, Method, Content, noflow}). do_flow(Pid, Method, Content) -> credit_flow:send(Pid), gen_server2:cast(Pid, {method, Method, Content, flow}). flush(Pid) -> gen_server2:call(Pid, flush, infinity). shutdown(Pid) -> gen_server2:cast(Pid, terminate). send_command(Pid, Msg) -> gen_server2:cast(Pid, {command, Msg}). deliver(Pid, ConsumerTag, AckRequired, Msg) -> gen_server2:cast(Pid, {deliver, ConsumerTag, AckRequired, Msg}). flushed(Pid, QPid) -> gen_server2:cast(Pid, {flushed, QPid}). list() -> rabbit_misc:append_rpc_all_nodes(rabbit_mnesia:running_clustered_nodes(), rabbit_channel, list_local, []). list_local() -> pg_local:get_members(rabbit_channels). info_keys() -> ?INFO_KEYS. info(Pid) -> gen_server2:call(Pid, info, infinity). info(Pid, Items) -> case gen_server2:call(Pid, {info, Items}, infinity) of {ok, Res} -> Res; {error, Error} -> throw(Error) end. info_all() -> rabbit_misc:filter_exit_map(fun (C) -> info(C) end, list()). info_all(Items) -> rabbit_misc:filter_exit_map(fun (C) -> info(C, Items) end, list()). refresh_config_local() -> rabbit_misc:upmap( fun (C) -> gen_server2:call(C, refresh_config) end, list_local()), ok. ready_for_close(Pid) -> gen_server2:cast(Pid, ready_for_close). force_event_refresh() -> [gen_server2:cast(C, force_event_refresh) || C <- list()], ok. %%--------------------------------------------------------------------------- init([Channel, ReaderPid, WriterPid, ConnPid, ConnName, Protocol, User, VHost, Capabilities, CollectorPid, Limiter]) -> process_flag(trap_exit, true), ok = pg_local:join(rabbit_channels, self()), State = #ch{state = starting, protocol = Protocol, channel = Channel, reader_pid = ReaderPid, writer_pid = WriterPid, conn_pid = ConnPid, conn_name = ConnName, limiter = Limiter, tx_status = none, next_tag = 1, unacked_message_q = queue:new(), uncommitted_message_q = queue:new(), uncommitted_acks = [], uncommitted_nacks = [], user = User, virtual_host = VHost, most_recently_declared_queue = <<>>, queue_monitors = pmon:new(), consumer_mapping = dict:new(), blocking = sets:new(), queue_consumers = dict:new(), queue_collector_pid = CollectorPid, confirm_enabled = false, publish_seqno = 1, unconfirmed = dtree:empty(), confirmed = [], capabilities = Capabilities, trace_state = rabbit_trace:init(VHost)}, State1 = rabbit_event:init_stats_timer(State, #ch.stats_timer), rabbit_event:notify(channel_created, infos(?CREATION_EVENT_KEYS, State1)), rabbit_event:if_enabled(State1, #ch.stats_timer, fun() -> emit_stats(State1) end), {ok, State1, hibernate, {backoff, ?HIBERNATE_AFTER_MIN, ?HIBERNATE_AFTER_MIN, ?DESIRED_HIBERNATE}}. prioritise_call(Msg, _From, _State) -> case Msg of info -> 9; {info, _Items} -> 9; _ -> 0 end. prioritise_cast(Msg, _State) -> case Msg of {confirm, _MsgSeqNos, _QPid} -> 5; _ -> 0 end. prioritise_info(Msg, _State) -> case Msg of emit_stats -> 7; _ -> 0 end. handle_call(flush, _From, State) -> reply(ok, State); handle_call(info, _From, State) -> reply(infos(?INFO_KEYS, State), State); handle_call({info, Items}, _From, State) -> try reply({ok, infos(Items, State)}, State) catch Error -> reply({error, Error}, State) end; handle_call(refresh_config, _From, State = #ch{virtual_host = VHost}) -> reply(ok, State#ch{trace_state = rabbit_trace:init(VHost)}); handle_call(_Request, _From, State) -> noreply(State). handle_cast({method, Method, Content, Flow}, State = #ch{reader_pid = Reader}) -> case Flow of flow -> credit_flow:ack(Reader); noflow -> ok end, try handle_method(Method, Content, State) of {reply, Reply, NewState} -> ok = rabbit_writer:send_command(NewState#ch.writer_pid, Reply), noreply(NewState); {noreply, NewState} -> noreply(NewState); stop -> {stop, normal, State} catch exit:Reason = #amqp_error{} -> MethodName = rabbit_misc:method_record_type(Method), send_exception(Reason#amqp_error{method = MethodName}, State); _:Reason -> {stop, {Reason, erlang:get_stacktrace()}, State} end; handle_cast({flushed, QPid}, State) -> {noreply, queue_blocked(QPid, State), hibernate}; handle_cast(ready_for_close, State = #ch{state = closing, writer_pid = WriterPid}) -> ok = rabbit_writer:send_command_sync(WriterPid, #'channel.close_ok'{}), {stop, normal, State}; handle_cast(terminate, State) -> {stop, normal, State}; handle_cast({command, #'basic.consume_ok'{consumer_tag = ConsumerTag} = Msg}, State = #ch{writer_pid = WriterPid}) -> ok = rabbit_writer:send_command(WriterPid, Msg), noreply(consumer_monitor(ConsumerTag, State)); handle_cast({command, Msg}, State = #ch{writer_pid = WriterPid}) -> ok = rabbit_writer:send_command(WriterPid, Msg), noreply(State); handle_cast({deliver, ConsumerTag, AckRequired, Msg = {_QName, QPid, _MsgId, Redelivered, #basic_message{exchange_name = ExchangeName, routing_keys = [RoutingKey | _CcRoutes], content = Content}}}, State = #ch{writer_pid = WriterPid, next_tag = DeliveryTag}) -> ok = rabbit_writer:send_command_and_notify( WriterPid, QPid, self(), #'basic.deliver'{consumer_tag = ConsumerTag, delivery_tag = DeliveryTag, redelivered = Redelivered, exchange = ExchangeName#resource.name, routing_key = RoutingKey}, Content), noreply(record_sent(ConsumerTag, AckRequired, Msg, State)); handle_cast(force_event_refresh, State) -> rabbit_event:notify(channel_created, infos(?CREATION_EVENT_KEYS, State)), noreply(State); handle_cast({confirm, MsgSeqNos, From}, State) -> State1 = #ch{confirmed = C} = confirm(MsgSeqNos, From, State), noreply([send_confirms], State1, case C of [] -> hibernate; _ -> 0 end). handle_info({bump_credit, Msg}, State) -> credit_flow:handle_bump_msg(Msg), noreply(State); handle_info(timeout, State) -> noreply(State); handle_info(emit_stats, State) -> emit_stats(State), noreply([ensure_stats_timer], rabbit_event:reset_stats_timer(State, #ch.stats_timer)); handle_info({'DOWN', _MRef, process, QPid, Reason}, State) -> State1 = handle_publishing_queue_down(QPid, Reason, State), State2 = queue_blocked(QPid, State1), State3 = handle_consuming_queue_down(QPid, State2), credit_flow:peer_down(QPid), erase_queue_stats(QPid), noreply(State3#ch{queue_monitors = pmon:erase( QPid, State3#ch.queue_monitors)}); handle_info({'EXIT', _Pid, Reason}, State) -> {stop, Reason, State}. handle_pre_hibernate(State) -> ok = clear_permission_cache(), rabbit_event:if_enabled( State, #ch.stats_timer, fun () -> emit_stats(State, [{idle_since, now()}]) end), {hibernate, rabbit_event:stop_stats_timer(State, #ch.stats_timer)}. terminate(Reason, State) -> {Res, _State1} = notify_queues(State), case Reason of normal -> ok = Res; shutdown -> ok = Res; {shutdown, _Term} -> ok = Res; _ -> ok end, pg_local:leave(rabbit_channels, self()), rabbit_event:notify(channel_closed, [{pid, self()}]). code_change(_OldVsn, State, _Extra) -> {ok, State}. format_message_queue(Opt, MQ) -> rabbit_misc:format_message_queue(Opt, MQ). %%--------------------------------------------------------------------------- reply(Reply, NewState) -> reply(Reply, [], NewState). reply(Reply, Mask, NewState) -> reply(Reply, Mask, NewState, hibernate). reply(Reply, Mask, NewState, Timeout) -> {reply, Reply, next_state(Mask, NewState), Timeout}. noreply(NewState) -> noreply([], NewState). noreply(Mask, NewState) -> noreply(Mask, NewState, hibernate). noreply(Mask, NewState, Timeout) -> {noreply, next_state(Mask, NewState), Timeout}. -define(MASKED_CALL(Fun, Mask, State), case lists:member(Fun, Mask) of true -> State; false -> Fun(State) end). next_state(Mask, State) -> State1 = ?MASKED_CALL(ensure_stats_timer, Mask, State), State2 = ?MASKED_CALL(send_confirms, Mask, State1), State2. ensure_stats_timer(State) -> rabbit_event:ensure_stats_timer(State, #ch.stats_timer, emit_stats). return_ok(State, true, _Msg) -> {noreply, State}; return_ok(State, false, Msg) -> {reply, Msg, State}. ok_msg(true, _Msg) -> undefined; ok_msg(false, Msg) -> Msg. send_exception(Reason, State = #ch{protocol = Protocol, channel = Channel, writer_pid = WriterPid, reader_pid = ReaderPid, conn_pid = ConnPid}) -> {CloseChannel, CloseMethod} = rabbit_binary_generator:map_exception(Channel, Reason, Protocol), rabbit_log:error("connection ~p, channel ~p - error:~n~p~n", [ConnPid, Channel, Reason]), %% something bad's happened: notify_queues may not be 'ok' {_Result, State1} = notify_queues(State), case CloseChannel of Channel -> ok = rabbit_writer:send_command(WriterPid, CloseMethod), {noreply, State1}; _ -> ReaderPid ! {channel_exit, Channel, Reason}, {stop, normal, State1} end. return_queue_declare_ok(#resource{name = ActualName}, NoWait, MessageCount, ConsumerCount, State) -> return_ok(State#ch{most_recently_declared_queue = ActualName}, NoWait, #'queue.declare_ok'{queue = ActualName, message_count = MessageCount, consumer_count = ConsumerCount}). check_resource_access(User, Resource, Perm) -> V = {Resource, Perm}, Cache = case get(permission_cache) of undefined -> []; Other -> Other end, CacheTail = case lists:member(V, Cache) of true -> lists:delete(V, Cache); false -> ok = rabbit_access_control:check_resource_access( User, Resource, Perm), lists:sublist(Cache, ?MAX_PERMISSION_CACHE_SIZE - 1) end, put(permission_cache, [V | CacheTail]), ok. clear_permission_cache() -> erase(permission_cache), ok. check_configure_permitted(Resource, #ch{user = User}) -> check_resource_access(User, Resource, configure). check_write_permitted(Resource, #ch{user = User}) -> check_resource_access(User, Resource, write). check_read_permitted(Resource, #ch{user = User}) -> check_resource_access(User, Resource, read). check_user_id_header(#'P_basic'{user_id = undefined}, _) -> ok; check_user_id_header(#'P_basic'{user_id = Username}, #ch{user = #user{username = Username}}) -> ok; check_user_id_header(#'P_basic'{user_id = Claimed}, #ch{user = #user{username = Actual}}) -> rabbit_misc:protocol_error( precondition_failed, "user_id property set to '~s' but " "authenticated user was '~s'", [Claimed, Actual]). check_internal_exchange(#exchange{name = Name, internal = true}) -> rabbit_misc:protocol_error(access_refused, "cannot publish to internal ~s", [rabbit_misc:rs(Name)]); check_internal_exchange(_) -> ok. expand_queue_name_shortcut(<<>>, #ch{most_recently_declared_queue = <<>>}) -> rabbit_misc:protocol_error( not_found, "no previously declared queue", []); expand_queue_name_shortcut(<<>>, #ch{virtual_host = VHostPath, most_recently_declared_queue = MRDQ}) -> rabbit_misc:r(VHostPath, queue, MRDQ); expand_queue_name_shortcut(QueueNameBin, #ch{virtual_host = VHostPath}) -> rabbit_misc:r(VHostPath, queue, QueueNameBin). expand_routing_key_shortcut(<<>>, <<>>, #ch{most_recently_declared_queue = <<>>}) -> rabbit_misc:protocol_error( not_found, "no previously declared queue", []); expand_routing_key_shortcut(<<>>, <<>>, #ch{most_recently_declared_queue = MRDQ}) -> MRDQ; expand_routing_key_shortcut(_QueueNameBin, RoutingKey, _State) -> RoutingKey. expand_binding(queue, DestinationNameBin, RoutingKey, State) -> {expand_queue_name_shortcut(DestinationNameBin, State), expand_routing_key_shortcut(DestinationNameBin, RoutingKey, State)}; expand_binding(exchange, DestinationNameBin, RoutingKey, State) -> {rabbit_misc:r(State#ch.virtual_host, exchange, DestinationNameBin), RoutingKey}. check_not_default_exchange(#resource{kind = exchange, name = <<"">>}) -> rabbit_misc:protocol_error( access_refused, "operation not permitted on the default exchange", []); check_not_default_exchange(_) -> ok. %% check that an exchange/queue name does not contain the reserved %% "amq." prefix. %% %% One, quite reasonable, interpretation of the spec, taken by the %% QPid M1 Java client, is that the exclusion of "amq." prefixed names %% only applies on actual creation, and not in the cases where the %% entity already exists. This is how we use this function in the code %% below. However, AMQP JIRA 123 changes that in 0-10, and possibly %% 0-9SP1, making it illegal to attempt to declare an exchange/queue %% with an amq.* name when passive=false. So this will need %% revisiting. %% %% TODO: enforce other constraints on name. See AMQP JIRA 69. check_name(Kind, NameBin = <<"amq.", _/binary>>) -> rabbit_misc:protocol_error( access_refused, "~s name '~s' contains reserved prefix 'amq.*'",[Kind, NameBin]); check_name(_Kind, NameBin) -> NameBin. queue_blocked(QPid, State = #ch{blocking = Blocking}) -> case sets:is_element(QPid, Blocking) of false -> State; true -> Blocking1 = sets:del_element(QPid, Blocking), ok = case sets:size(Blocking1) of 0 -> rabbit_writer:send_command( State#ch.writer_pid, #'channel.flow_ok'{active = false}); _ -> ok end, State#ch{blocking = Blocking1} end. record_confirm(undefined, _, State) -> State; record_confirm(MsgSeqNo, XName, State) -> record_confirms([{MsgSeqNo, XName}], State). record_confirms([], State) -> State; record_confirms(MXs, State = #ch{confirmed = C}) -> State#ch{confirmed = [MXs | C]}. confirm([], _QPid, State) -> State; confirm(MsgSeqNos, QPid, State = #ch{unconfirmed = UC}) -> {MXs, UC1} = dtree:take(MsgSeqNos, QPid, UC), record_confirms(MXs, State#ch{unconfirmed = UC1}). handle_method(#'channel.open'{}, _, State = #ch{state = starting}) -> {reply, #'channel.open_ok'{}, State#ch{state = running}}; handle_method(#'channel.open'{}, _, _State) -> rabbit_misc:protocol_error( command_invalid, "second 'channel.open' seen", []); handle_method(_Method, _, #ch{state = starting}) -> rabbit_misc:protocol_error(channel_error, "expected 'channel.open'", []); handle_method(#'channel.close_ok'{}, _, #ch{state = closing}) -> stop; handle_method(#'channel.close'{}, _, State = #ch{state = closing}) -> {reply, #'channel.close_ok'{}, State}; handle_method(_Method, _, State = #ch{state = closing}) -> {noreply, State}; handle_method(#'channel.close'{}, _, State = #ch{reader_pid = ReaderPid}) -> {ok, State1} = notify_queues(State), ReaderPid ! {channel_closing, self()}, {noreply, State1}; %% Even though the spec prohibits the client from sending commands %% while waiting for the reply to a synchronous command, we generally %% do allow this...except in the case of a pending tx.commit, where %% it could wreak havoc. handle_method(_Method, _, #ch{tx_status = TxStatus}) when TxStatus =/= none andalso TxStatus =/= in_progress -> rabbit_misc:protocol_error( channel_error, "unexpected command while processing 'tx.commit'", []); handle_method(#'access.request'{},_, State) -> {reply, #'access.request_ok'{ticket = 1}, State}; handle_method(#'basic.publish'{exchange = ExchangeNameBin, routing_key = RoutingKey, mandatory = Mandatory, immediate = Immediate}, Content, State = #ch{virtual_host = VHostPath, tx_status = TxStatus, confirm_enabled = ConfirmEnabled, trace_state = TraceState}) -> ExchangeName = rabbit_misc:r(VHostPath, exchange, ExchangeNameBin), check_write_permitted(ExchangeName, State), Exchange = rabbit_exchange:lookup_or_die(ExchangeName), check_internal_exchange(Exchange), %% We decode the content's properties here because we're almost %% certain to want to look at delivery-mode and priority. DecodedContent = rabbit_binary_parser:ensure_content_decoded(Content), check_user_id_header(DecodedContent#content.properties, State), {MsgSeqNo, State1} = case {TxStatus, ConfirmEnabled} of {none, false} -> {undefined, State}; {_, _} -> SeqNo = State#ch.publish_seqno, {SeqNo, State#ch{publish_seqno = SeqNo + 1}} end, case rabbit_basic:message(ExchangeName, RoutingKey, DecodedContent) of {ok, Message} -> rabbit_trace:tap_trace_in(Message, TraceState), Delivery = rabbit_basic:delivery(Mandatory, Immediate, Message, MsgSeqNo), QNames = rabbit_exchange:route(Exchange, Delivery), {noreply, case TxStatus of none -> deliver_to_queues({Delivery, QNames}, State1); in_progress -> TMQ = State1#ch.uncommitted_message_q, NewTMQ = queue:in({Delivery, QNames}, TMQ), State1#ch{uncommitted_message_q = NewTMQ} end}; {error, Reason} -> rabbit_misc:protocol_error(precondition_failed, "invalid message: ~p", [Reason]) end; handle_method(#'basic.nack'{delivery_tag = DeliveryTag, multiple = Multiple, requeue = Requeue}, _, State) -> reject(DeliveryTag, Requeue, Multiple, State); handle_method(#'basic.ack'{delivery_tag = DeliveryTag, multiple = Multiple}, _, State = #ch{unacked_message_q = UAMQ, tx_status = TxStatus}) -> {Acked, Remaining} = collect_acks(UAMQ, DeliveryTag, Multiple), State1 = State#ch{unacked_message_q = Remaining}, {noreply, case TxStatus of none -> ack(Acked, State1), State1; in_progress -> State1#ch{uncommitted_acks = Acked ++ State1#ch.uncommitted_acks} end}; handle_method(#'basic.get'{queue = QueueNameBin, no_ack = NoAck}, _, State = #ch{writer_pid = WriterPid, conn_pid = ConnPid, next_tag = DeliveryTag}) -> QueueName = expand_queue_name_shortcut(QueueNameBin, State), check_read_permitted(QueueName, State), case rabbit_amqqueue:with_exclusive_access_or_die( QueueName, ConnPid, fun (Q) -> rabbit_amqqueue:basic_get(Q, self(), NoAck) end) of {ok, MessageCount, Msg = {_QName, _QPid, _MsgId, Redelivered, #basic_message{exchange_name = ExchangeName, routing_keys = [RoutingKey | _CcRoutes], content = Content}}} -> ok = rabbit_writer:send_command( WriterPid, #'basic.get_ok'{delivery_tag = DeliveryTag, redelivered = Redelivered, exchange = ExchangeName#resource.name, routing_key = RoutingKey, message_count = MessageCount}, Content), {noreply, record_sent(none, not(NoAck), Msg, State)}; empty -> {reply, #'basic.get_empty'{}, State} end; handle_method(#'basic.consume'{queue = QueueNameBin, consumer_tag = ConsumerTag, no_local = _, % FIXME: implement no_ack = NoAck, exclusive = ExclusiveConsume, nowait = NoWait}, _, State = #ch{conn_pid = ConnPid, limiter = Limiter, consumer_mapping = ConsumerMapping}) -> case dict:find(ConsumerTag, ConsumerMapping) of error -> QueueName = expand_queue_name_shortcut(QueueNameBin, State), check_read_permitted(QueueName, State), ActualConsumerTag = case ConsumerTag of <<>> -> rabbit_guid:binary(rabbit_guid:gen_secure(), "amq.ctag"); Other -> Other end, %% We get the queue process to send the consume_ok on our %% behalf. This is for symmetry with basic.cancel - see %% the comment in that method for why. case rabbit_amqqueue:with_exclusive_access_or_die( QueueName, ConnPid, fun (Q) -> {rabbit_amqqueue:basic_consume( Q, NoAck, self(), Limiter, ActualConsumerTag, ExclusiveConsume, ok_msg(NoWait, #'basic.consume_ok'{ consumer_tag = ActualConsumerTag})), Q} end) of {ok, Q} -> State1 = State#ch{consumer_mapping = dict:store(ActualConsumerTag, Q, ConsumerMapping)}, {noreply, case NoWait of true -> consumer_monitor(ActualConsumerTag, State1); false -> State1 end}; {{error, exclusive_consume_unavailable}, _Q} -> rabbit_misc:protocol_error( access_refused, "~s in exclusive use", [rabbit_misc:rs(QueueName)]) end; {ok, _} -> %% Attempted reuse of consumer tag. rabbit_misc:protocol_error( not_allowed, "attempt to reuse consumer tag '~s'", [ConsumerTag]) end; handle_method(#'basic.cancel'{consumer_tag = ConsumerTag, nowait = NoWait}, _, State = #ch{consumer_mapping = ConsumerMapping, queue_consumers = QCons}) -> OkMsg = #'basic.cancel_ok'{consumer_tag = ConsumerTag}, case dict:find(ConsumerTag, ConsumerMapping) of error -> %% Spec requires we ignore this situation. return_ok(State, NoWait, OkMsg); {ok, Q = #amqqueue{pid = QPid}} -> ConsumerMapping1 = dict:erase(ConsumerTag, ConsumerMapping), QCons1 = case dict:find(QPid, QCons) of error -> QCons; {ok, CTags} -> CTags1 = gb_sets:delete(ConsumerTag, CTags), case gb_sets:is_empty(CTags1) of true -> dict:erase(QPid, QCons); false -> dict:store(QPid, CTags1, QCons) end end, NewState = State#ch{consumer_mapping = ConsumerMapping1, queue_consumers = QCons1}, %% In order to ensure that no more messages are sent to %% the consumer after the cancel_ok has been sent, we get %% the queue process to send the cancel_ok on our %% behalf. If we were sending the cancel_ok ourselves it %% might overtake a message sent previously by the queue. case rabbit_misc:with_exit_handler( fun () -> {error, not_found} end, fun () -> rabbit_amqqueue:basic_cancel( Q, self(), ConsumerTag, ok_msg(NoWait, OkMsg)) end) of ok -> {noreply, NewState}; {error, not_found} -> %% Spec requires we ignore this situation. return_ok(NewState, NoWait, OkMsg) end end; handle_method(#'basic.qos'{global = true}, _, _State) -> rabbit_misc:protocol_error(not_implemented, "global=true", []); handle_method(#'basic.qos'{prefetch_size = Size}, _, _State) when Size /= 0 -> rabbit_misc:protocol_error(not_implemented, "prefetch_size!=0 (~w)", [Size]); handle_method(#'basic.qos'{prefetch_count = PrefetchCount}, _, State = #ch{limiter = Limiter}) -> Limiter1 = case {rabbit_limiter:is_enabled(Limiter), PrefetchCount} of {false, 0} -> Limiter; {false, _} -> enable_limiter(State); {_, _} -> Limiter end, Limiter3 = case rabbit_limiter:limit(Limiter1, PrefetchCount) of ok -> Limiter1; {disabled, Limiter2} -> ok = limit_queues(Limiter2, State), Limiter2 end, {reply, #'basic.qos_ok'{}, State#ch{limiter = Limiter3}}; handle_method(#'basic.recover_async'{requeue = true}, _, State = #ch{unacked_message_q = UAMQ, limiter = Limiter}) -> OkFun = fun () -> ok end, UAMQL = queue:to_list(UAMQ), ok = fold_per_queue( fun (QPid, MsgIds, ok) -> rabbit_misc:with_exit_handler( OkFun, fun () -> rabbit_amqqueue:requeue( QPid, MsgIds, self()) end) end, ok, UAMQL), ok = notify_limiter(Limiter, UAMQL), %% No answer required - basic.recover is the newer, synchronous %% variant of this method {noreply, State#ch{unacked_message_q = queue:new()}}; handle_method(#'basic.recover_async'{requeue = false}, _, _State) -> rabbit_misc:protocol_error(not_implemented, "requeue=false", []); handle_method(#'basic.recover'{requeue = Requeue}, Content, State) -> {noreply, State2 = #ch{writer_pid = WriterPid}} = handle_method(#'basic.recover_async'{requeue = Requeue}, Content, State), ok = rabbit_writer:send_command(WriterPid, #'basic.recover_ok'{}), {noreply, State2}; handle_method(#'basic.reject'{delivery_tag = DeliveryTag, requeue = Requeue}, _, State) -> reject(DeliveryTag, Requeue, false, State); handle_method(#'exchange.declare'{exchange = ExchangeNameBin, type = TypeNameBin, passive = false, durable = Durable, auto_delete = AutoDelete, internal = Internal, nowait = NoWait, arguments = Args}, _, State = #ch{virtual_host = VHostPath}) -> CheckedType = rabbit_exchange:check_type(TypeNameBin), ExchangeName = rabbit_misc:r(VHostPath, exchange, ExchangeNameBin), check_not_default_exchange(ExchangeName), check_configure_permitted(ExchangeName, State), X = case rabbit_exchange:lookup(ExchangeName) of {ok, FoundX} -> FoundX; {error, not_found} -> check_name('exchange', ExchangeNameBin), case rabbit_misc:r_arg(VHostPath, exchange, Args, <<"alternate-exchange">>) of undefined -> ok; AName -> check_read_permitted(ExchangeName, State), check_write_permitted(AName, State), ok end, rabbit_exchange:declare(ExchangeName, CheckedType, Durable, AutoDelete, Internal, Args) end, ok = rabbit_exchange:assert_equivalence(X, CheckedType, Durable, AutoDelete, Internal, Args), return_ok(State, NoWait, #'exchange.declare_ok'{}); handle_method(#'exchange.declare'{exchange = ExchangeNameBin, passive = true, nowait = NoWait}, _, State = #ch{virtual_host = VHostPath}) -> ExchangeName = rabbit_misc:r(VHostPath, exchange, ExchangeNameBin), check_not_default_exchange(ExchangeName), _ = rabbit_exchange:lookup_or_die(ExchangeName), return_ok(State, NoWait, #'exchange.declare_ok'{}); handle_method(#'exchange.delete'{exchange = ExchangeNameBin, if_unused = IfUnused, nowait = NoWait}, _, State = #ch{virtual_host = VHostPath}) -> ExchangeName = rabbit_misc:r(VHostPath, exchange, ExchangeNameBin), check_not_default_exchange(ExchangeName), check_configure_permitted(ExchangeName, State), case rabbit_exchange:delete(ExchangeName, IfUnused) of {error, not_found} -> rabbit_misc:not_found(ExchangeName); {error, in_use} -> rabbit_misc:protocol_error( precondition_failed, "~s in use", [rabbit_misc:rs(ExchangeName)]); ok -> return_ok(State, NoWait, #'exchange.delete_ok'{}) end; handle_method(#'exchange.bind'{destination = DestinationNameBin, source = SourceNameBin, routing_key = RoutingKey, nowait = NoWait, arguments = Arguments}, _, State) -> binding_action(fun rabbit_binding:add/2, SourceNameBin, exchange, DestinationNameBin, RoutingKey, Arguments, #'exchange.bind_ok'{}, NoWait, State); handle_method(#'exchange.unbind'{destination = DestinationNameBin, source = SourceNameBin, routing_key = RoutingKey, nowait = NoWait, arguments = Arguments}, _, State) -> binding_action(fun rabbit_binding:remove/2, SourceNameBin, exchange, DestinationNameBin, RoutingKey, Arguments, #'exchange.unbind_ok'{}, NoWait, State); handle_method(#'queue.declare'{queue = QueueNameBin, passive = false, durable = Durable, exclusive = ExclusiveDeclare, auto_delete = AutoDelete, nowait = NoWait, arguments = Args} = Declare, _, State = #ch{virtual_host = VHostPath, conn_pid = ConnPid, queue_collector_pid = CollectorPid}) -> Owner = case ExclusiveDeclare of true -> ConnPid; false -> none end, ActualNameBin = case QueueNameBin of <<>> -> rabbit_guid:binary(rabbit_guid:gen_secure(), "amq.gen"); Other -> check_name('queue', Other) end, QueueName = rabbit_misc:r(VHostPath, queue, ActualNameBin), check_configure_permitted(QueueName, State), case rabbit_amqqueue:with( QueueName, fun (Q) -> ok = rabbit_amqqueue:assert_equivalence( Q, Durable, AutoDelete, Args, Owner), rabbit_amqqueue:stat(Q) end) of {ok, MessageCount, ConsumerCount} -> return_queue_declare_ok(QueueName, NoWait, MessageCount, ConsumerCount, State); {error, not_found} -> case rabbit_amqqueue:declare(QueueName, Durable, AutoDelete, Args, Owner) of {new, #amqqueue{pid = QPid}} -> %% We need to notify the reader within the channel %% process so that we can be sure there are no %% outstanding exclusive queues being declared as %% the connection shuts down. ok = case Owner of none -> ok; _ -> rabbit_queue_collector:register( CollectorPid, QPid) end, return_queue_declare_ok(QueueName, NoWait, 0, 0, State); {existing, _Q} -> %% must have been created between the stat and the %% declare. Loop around again. handle_method(Declare, none, State) end end; handle_method(#'queue.declare'{queue = QueueNameBin, passive = true, nowait = NoWait}, _, State = #ch{virtual_host = VHostPath, conn_pid = ConnPid}) -> QueueName = rabbit_misc:r(VHostPath, queue, QueueNameBin), {{ok, MessageCount, ConsumerCount}, #amqqueue{} = Q} = rabbit_amqqueue:with_or_die( QueueName, fun (Q) -> {rabbit_amqqueue:stat(Q), Q} end), ok = rabbit_amqqueue:check_exclusive_access(Q, ConnPid), return_queue_declare_ok(QueueName, NoWait, MessageCount, ConsumerCount, State); handle_method(#'queue.delete'{queue = QueueNameBin, if_unused = IfUnused, if_empty = IfEmpty, nowait = NoWait}, _, State = #ch{conn_pid = ConnPid}) -> QueueName = expand_queue_name_shortcut(QueueNameBin, State), check_configure_permitted(QueueName, State), case rabbit_amqqueue:with_exclusive_access_or_die( QueueName, ConnPid, fun (Q) -> rabbit_amqqueue:delete(Q, IfUnused, IfEmpty) end) of {error, in_use} -> rabbit_misc:protocol_error( precondition_failed, "~s in use", [rabbit_misc:rs(QueueName)]); {error, not_empty} -> rabbit_misc:protocol_error( precondition_failed, "~s not empty", [rabbit_misc:rs(QueueName)]); {ok, PurgedMessageCount} -> return_ok(State, NoWait, #'queue.delete_ok'{message_count = PurgedMessageCount}) end; handle_method(#'queue.bind'{queue = QueueNameBin, exchange = ExchangeNameBin, routing_key = RoutingKey, nowait = NoWait, arguments = Arguments}, _, State) -> binding_action(fun rabbit_binding:add/2, ExchangeNameBin, queue, QueueNameBin, RoutingKey, Arguments, #'queue.bind_ok'{}, NoWait, State); handle_method(#'queue.unbind'{queue = QueueNameBin, exchange = ExchangeNameBin, routing_key = RoutingKey, arguments = Arguments}, _, State) -> binding_action(fun rabbit_binding:remove/2, ExchangeNameBin, queue, QueueNameBin, RoutingKey, Arguments, #'queue.unbind_ok'{}, false, State); handle_method(#'queue.purge'{queue = QueueNameBin, nowait = NoWait}, _, State = #ch{conn_pid = ConnPid}) -> QueueName = expand_queue_name_shortcut(QueueNameBin, State), check_read_permitted(QueueName, State), {ok, PurgedMessageCount} = rabbit_amqqueue:with_exclusive_access_or_die( QueueName, ConnPid, fun (Q) -> rabbit_amqqueue:purge(Q) end), return_ok(State, NoWait, #'queue.purge_ok'{message_count = PurgedMessageCount}); handle_method(#'tx.select'{}, _, #ch{confirm_enabled = true}) -> rabbit_misc:protocol_error( precondition_failed, "cannot switch from confirm to tx mode", []); handle_method(#'tx.select'{}, _, State) -> {reply, #'tx.select_ok'{}, State#ch{tx_status = in_progress}}; handle_method(#'tx.commit'{}, _, #ch{tx_status = none}) -> rabbit_misc:protocol_error( precondition_failed, "channel is not transactional", []); handle_method(#'tx.commit'{}, _, State = #ch{uncommitted_message_q = TMQ, uncommitted_acks = TAL, uncommitted_nacks = TNL, limiter = Limiter}) -> State1 = rabbit_misc:queue_fold(fun deliver_to_queues/2, State, TMQ), ack(TAL, State1), lists:foreach( fun({Requeue, Acked}) -> reject(Requeue, Acked, Limiter) end, TNL), {noreply, maybe_complete_tx(new_tx(State1#ch{tx_status = committing}))}; handle_method(#'tx.rollback'{}, _, #ch{tx_status = none}) -> rabbit_misc:protocol_error( precondition_failed, "channel is not transactional", []); handle_method(#'tx.rollback'{}, _, State = #ch{unacked_message_q = UAMQ, uncommitted_acks = TAL, uncommitted_nacks = TNL}) -> TNL1 = lists:append([L || {_, L} <- TNL]), UAMQ1 = queue:from_list(lists:usort(TAL ++ TNL1 ++ queue:to_list(UAMQ))), {reply, #'tx.rollback_ok'{}, new_tx(State#ch{unacked_message_q = UAMQ1})}; handle_method(#'confirm.select'{}, _, #ch{tx_status = in_progress}) -> rabbit_misc:protocol_error( precondition_failed, "cannot switch from tx to confirm mode", []); handle_method(#'confirm.select'{nowait = NoWait}, _, State) -> return_ok(State#ch{confirm_enabled = true}, NoWait, #'confirm.select_ok'{}); handle_method(#'channel.flow'{active = true}, _, State = #ch{limiter = Limiter}) -> Limiter2 = case rabbit_limiter:unblock(Limiter) of ok -> Limiter; {disabled, Limiter1} -> ok = limit_queues(Limiter1, State), Limiter1 end, {reply, #'channel.flow_ok'{active = true}, State#ch{limiter = Limiter2}}; handle_method(#'channel.flow'{active = false}, _, State = #ch{consumer_mapping = Consumers, limiter = Limiter}) -> Limiter1 = case rabbit_limiter:is_enabled(Limiter) of true -> Limiter; false -> enable_limiter(State) end, State1 = State#ch{limiter = Limiter1}, ok = rabbit_limiter:block(Limiter1), case consumer_queues(Consumers) of [] -> {reply, #'channel.flow_ok'{active = false}, State1}; QPids -> State2 = State1#ch{blocking = sets:from_list(QPids)}, ok = rabbit_amqqueue:flush_all(QPids, self()), {noreply, State2} end; handle_method(_MethodRecord, _Content, _State) -> rabbit_misc:protocol_error( command_invalid, "unimplemented method", []). %%---------------------------------------------------------------------------- consumer_monitor(ConsumerTag, State = #ch{consumer_mapping = ConsumerMapping, queue_monitors = QMons, queue_consumers = QCons, capabilities = Capabilities}) -> case rabbit_misc:table_lookup( Capabilities, <<"consumer_cancel_notify">>) of {bool, true} -> #amqqueue{pid = QPid} = dict:fetch(ConsumerTag, ConsumerMapping), QCons1 = dict:update(QPid, fun (CTags) -> gb_sets:insert(ConsumerTag, CTags) end, gb_sets:singleton(ConsumerTag), QCons), State#ch{queue_monitors = pmon:monitor(QPid, QMons), queue_consumers = QCons1}; _ -> State end. handle_publishing_queue_down(QPid, Reason, State = #ch{unconfirmed = UC}) -> case rabbit_misc:is_abnormal_termination(Reason) of true -> {MXs, UC1} = dtree:take_all(QPid, UC), send_nacks(MXs, State#ch{unconfirmed = UC1}); false -> {MXs, UC1} = dtree:take(QPid, UC), record_confirms(MXs, State#ch{unconfirmed = UC1}) end. handle_consuming_queue_down(QPid, State = #ch{consumer_mapping = ConsumerMapping, queue_consumers = QCons, writer_pid = WriterPid}) -> ConsumerTags = case dict:find(QPid, QCons) of error -> gb_sets:new(); {ok, CTags} -> CTags end, ConsumerMapping1 = gb_sets:fold(fun (CTag, CMap) -> Cancel = #'basic.cancel'{consumer_tag = CTag, nowait = true}, ok = rabbit_writer:send_command(WriterPid, Cancel), dict:erase(CTag, CMap) end, ConsumerMapping, ConsumerTags), State#ch{consumer_mapping = ConsumerMapping1, queue_consumers = dict:erase(QPid, QCons)}. binding_action(Fun, ExchangeNameBin, DestinationType, DestinationNameBin, RoutingKey, Arguments, ReturnMethod, NoWait, State = #ch{virtual_host = VHostPath, conn_pid = ConnPid }) -> %% FIXME: connection exception (!) on failure?? %% (see rule named "failure" in spec-XML) %% FIXME: don't allow binding to internal exchanges - %% including the one named "" ! {DestinationName, ActualRoutingKey} = expand_binding(DestinationType, DestinationNameBin, RoutingKey, State), check_write_permitted(DestinationName, State), ExchangeName = rabbit_misc:r(VHostPath, exchange, ExchangeNameBin), [check_not_default_exchange(N) || N <- [DestinationName, ExchangeName]], check_read_permitted(ExchangeName, State), case Fun(#binding{source = ExchangeName, destination = DestinationName, key = ActualRoutingKey, args = Arguments}, fun (_X, Q = #amqqueue{}) -> try rabbit_amqqueue:check_exclusive_access(Q, ConnPid) catch exit:Reason -> {error, Reason} end; (_X, #exchange{}) -> ok end) of {error, source_not_found} -> rabbit_misc:not_found(ExchangeName); {error, destination_not_found} -> rabbit_misc:not_found(DestinationName); {error, source_and_destination_not_found} -> rabbit_misc:protocol_error( not_found, "no ~s and no ~s", [rabbit_misc:rs(ExchangeName), rabbit_misc:rs(DestinationName)]); {error, binding_not_found} -> rabbit_misc:protocol_error( not_found, "no binding ~s between ~s and ~s", [RoutingKey, rabbit_misc:rs(ExchangeName), rabbit_misc:rs(DestinationName)]); {error, #amqp_error{} = Error} -> rabbit_misc:protocol_error(Error); ok -> return_ok(State, NoWait, ReturnMethod) end. basic_return(#basic_message{exchange_name = ExchangeName, routing_keys = [RoutingKey | _CcRoutes], content = Content}, #ch{protocol = Protocol, writer_pid = WriterPid}, Reason) -> {_Close, ReplyCode, ReplyText} = Protocol:lookup_amqp_exception(Reason), ok = rabbit_writer:send_command( WriterPid, #'basic.return'{reply_code = ReplyCode, reply_text = ReplyText, exchange = ExchangeName#resource.name, routing_key = RoutingKey}, Content). reject(DeliveryTag, Requeue, Multiple, State = #ch{unacked_message_q = UAMQ, tx_status = TxStatus}) -> {Acked, Remaining} = collect_acks(UAMQ, DeliveryTag, Multiple), State1 = State#ch{unacked_message_q = Remaining}, {noreply, case TxStatus of none -> reject(Requeue, Acked, State1#ch.limiter), State1; in_progress -> State1#ch{uncommitted_nacks = [{Requeue, Acked} | State1#ch.uncommitted_nacks]} end}. reject(Requeue, Acked, Limiter) -> ok = fold_per_queue( fun (QPid, MsgIds, ok) -> rabbit_amqqueue:reject(QPid, MsgIds, Requeue, self()) end, ok, Acked), ok = notify_limiter(Limiter, Acked). record_sent(ConsumerTag, AckRequired, Msg = {_QName, QPid, MsgId, Redelivered, _Message}, State = #ch{unacked_message_q = UAMQ, next_tag = DeliveryTag, trace_state = TraceState}) -> maybe_incr_stats([{QPid, 1}], case {ConsumerTag, AckRequired} of {none, true} -> get; {none, false} -> get_no_ack; {_ , true} -> deliver; {_ , false} -> deliver_no_ack end, State), maybe_incr_redeliver_stats(Redelivered, QPid, State), rabbit_trace:tap_trace_out(Msg, TraceState), UAMQ1 = case AckRequired of true -> queue:in({DeliveryTag, ConsumerTag, {QPid, MsgId}}, UAMQ); false -> UAMQ end, State#ch{unacked_message_q = UAMQ1, next_tag = DeliveryTag + 1}. collect_acks(Q, 0, true) -> {queue:to_list(Q), queue:new()}; collect_acks(Q, DeliveryTag, Multiple) -> collect_acks([], queue:new(), Q, DeliveryTag, Multiple). collect_acks(ToAcc, PrefixAcc, Q, DeliveryTag, Multiple) -> case queue:out(Q) of {{value, UnackedMsg = {CurrentDeliveryTag, _ConsumerTag, _Msg}}, QTail} -> if CurrentDeliveryTag == DeliveryTag -> {[UnackedMsg | ToAcc], queue:join(PrefixAcc, QTail)}; Multiple -> collect_acks([UnackedMsg | ToAcc], PrefixAcc, QTail, DeliveryTag, Multiple); true -> collect_acks(ToAcc, queue:in(UnackedMsg, PrefixAcc), QTail, DeliveryTag, Multiple) end; {empty, _} -> rabbit_misc:protocol_error( precondition_failed, "unknown delivery tag ~w", [DeliveryTag]) end. ack(Acked, State) -> QIncs = fold_per_queue( fun (QPid, MsgIds, L) -> ok = rabbit_amqqueue:ack(QPid, MsgIds, self()), [{QPid, length(MsgIds)} | L] end, [], Acked), ok = notify_limiter(State#ch.limiter, Acked), maybe_incr_stats(QIncs, ack, State). new_tx(State) -> State#ch{uncommitted_message_q = queue:new(), uncommitted_acks = [], uncommitted_nacks = []}. notify_queues(State = #ch{state = closing}) -> {ok, State}; notify_queues(State = #ch{consumer_mapping = Consumers}) -> {rabbit_amqqueue:notify_down_all(consumer_queues(Consumers), self()), State#ch{state = closing}}. fold_per_queue(_F, Acc, []) -> Acc; fold_per_queue(F, Acc, [{_DTag, _CTag, {QPid, MsgId}}]) -> %% common case F(QPid, [MsgId], Acc); fold_per_queue(F, Acc, UAL) -> T = lists:foldl(fun ({_DTag, _CTag, {QPid, MsgId}}, T) -> rabbit_misc:gb_trees_cons(QPid, MsgId, T) end, gb_trees:empty(), UAL), rabbit_misc:gb_trees_fold(F, Acc, T). enable_limiter(State = #ch{unacked_message_q = UAMQ, limiter = Limiter}) -> Limiter1 = rabbit_limiter:enable(Limiter, queue:len(UAMQ)), ok = limit_queues(Limiter1, State), Limiter1. limit_queues(Limiter, #ch{consumer_mapping = Consumers}) -> rabbit_amqqueue:limit_all(consumer_queues(Consumers), self(), Limiter). consumer_queues(Consumers) -> lists:usort([QPid || {_Key, #amqqueue{pid = QPid}} <- dict:to_list(Consumers)]). %% tell the limiter about the number of acks that have been received %% for messages delivered to subscribed consumers, but not acks for %% messages sent in a response to a basic.get (identified by their %% 'none' consumer tag) notify_limiter(Limiter, Acked) -> case rabbit_limiter:is_enabled(Limiter) of false -> ok; true -> case lists:foldl(fun ({_, none, _}, Acc) -> Acc; ({_, _, _}, Acc) -> Acc + 1 end, 0, Acked) of 0 -> ok; Count -> rabbit_limiter:ack(Limiter, Count) end end. deliver_to_queues({Delivery = #delivery{message = Message = #basic_message{ exchange_name = XName}, msg_seq_no = MsgSeqNo}, QNames}, State) -> {RoutingRes, DeliveredQPids} = rabbit_amqqueue:deliver_flow(rabbit_amqqueue:lookup(QNames), Delivery), State1 = State#ch{queue_monitors = pmon:monitor_all(DeliveredQPids, State#ch.queue_monitors)}, State2 = process_routing_result(RoutingRes, DeliveredQPids, XName, MsgSeqNo, Message, State1), maybe_incr_stats([{XName, 1} | [{{QPid, XName}, 1} || QPid <- DeliveredQPids]], publish, State2), State2. process_routing_result(unroutable, _, XName, MsgSeqNo, Msg, State) -> ok = basic_return(Msg, State, no_route), maybe_incr_stats([{Msg#basic_message.exchange_name, 1}], return_unroutable, State), record_confirm(MsgSeqNo, XName, State); process_routing_result(not_delivered, _, XName, MsgSeqNo, Msg, State) -> ok = basic_return(Msg, State, no_consumers), maybe_incr_stats([{XName, 1}], return_not_delivered, State), record_confirm(MsgSeqNo, XName, State); process_routing_result(routed, [], XName, MsgSeqNo, _, State) -> record_confirm(MsgSeqNo, XName, State); process_routing_result(routed, _, _, undefined, _, State) -> State; process_routing_result(routed, QPids, XName, MsgSeqNo, _, State) -> State#ch{unconfirmed = dtree:insert(MsgSeqNo, QPids, XName, State#ch.unconfirmed)}. send_nacks([], State) -> State; send_nacks(MXs, State = #ch{tx_status = none}) -> coalesce_and_send([MsgSeqNo || {MsgSeqNo, _} <- MXs], fun(MsgSeqNo, Multiple) -> #'basic.nack'{delivery_tag = MsgSeqNo, multiple = Multiple} end, State); send_nacks(_, State) -> maybe_complete_tx(State#ch{tx_status = failed}). send_confirms(State = #ch{tx_status = none, confirmed = []}) -> State; send_confirms(State = #ch{tx_status = none, confirmed = C}) -> MsgSeqNos = lists:foldl(fun ({MsgSeqNo, XName}, MSNs) -> maybe_incr_stats([{XName, 1}], confirm, State), [MsgSeqNo | MSNs] end, [], lists:append(C)), send_confirms(MsgSeqNos, State#ch{confirmed = []}); send_confirms(State) -> maybe_complete_tx(State). send_confirms([], State) -> State; send_confirms([MsgSeqNo], State = #ch{writer_pid = WriterPid}) -> ok = rabbit_writer:send_command(WriterPid, #'basic.ack'{delivery_tag = MsgSeqNo}), State; send_confirms(Cs, State) -> coalesce_and_send(Cs, fun(MsgSeqNo, Multiple) -> #'basic.ack'{delivery_tag = MsgSeqNo, multiple = Multiple} end, State). coalesce_and_send(MsgSeqNos, MkMsgFun, State = #ch{writer_pid = WriterPid, unconfirmed = UC}) -> SMsgSeqNos = lists:usort(MsgSeqNos), CutOff = case dtree:is_empty(UC) of true -> lists:last(SMsgSeqNos) + 1; false -> {SeqNo, _XName} = dtree:smallest(UC), SeqNo end, {Ms, Ss} = lists:splitwith(fun(X) -> X < CutOff end, SMsgSeqNos), case Ms of [] -> ok; _ -> ok = rabbit_writer:send_command( WriterPid, MkMsgFun(lists:last(Ms), true)) end, [ok = rabbit_writer:send_command( WriterPid, MkMsgFun(SeqNo, false)) || SeqNo <- Ss], State. maybe_complete_tx(State = #ch{tx_status = in_progress}) -> State; maybe_complete_tx(State = #ch{unconfirmed = UC}) -> case dtree:is_empty(UC) of false -> State; true -> complete_tx(State#ch{confirmed = []}) end. complete_tx(State = #ch{tx_status = committing}) -> ok = rabbit_writer:send_command(State#ch.writer_pid, #'tx.commit_ok'{}), State#ch{tx_status = in_progress}; complete_tx(State = #ch{tx_status = failed}) -> {noreply, State1} = send_exception( rabbit_misc:amqp_error( precondition_failed, "partial tx completion", [], 'tx.commit'), State), State1#ch{tx_status = in_progress}. infos(Items, State) -> [{Item, i(Item, State)} || Item <- Items]. i(pid, _) -> self(); i(connection, #ch{conn_pid = ConnPid}) -> ConnPid; i(number, #ch{channel = Channel}) -> Channel; i(user, #ch{user = User}) -> User#user.username; i(vhost, #ch{virtual_host = VHost}) -> VHost; i(transactional, #ch{tx_status = TE}) -> TE =/= none; i(confirm, #ch{confirm_enabled = CE}) -> CE; i(name, State) -> name(State); i(consumer_count, #ch{consumer_mapping = ConsumerMapping}) -> dict:size(ConsumerMapping); i(messages_unconfirmed, #ch{unconfirmed = UC}) -> dtree:size(UC); i(messages_unacknowledged, #ch{unacked_message_q = UAMQ}) -> queue:len(UAMQ); i(messages_uncommitted, #ch{uncommitted_message_q = TMQ}) -> queue:len(TMQ); i(acks_uncommitted, #ch{uncommitted_acks = TAL}) -> length(TAL); i(prefetch_count, #ch{limiter = Limiter}) -> rabbit_limiter:get_limit(Limiter); i(client_flow_blocked, #ch{limiter = Limiter}) -> rabbit_limiter:is_blocked(Limiter); i(Item, _) -> throw({bad_argument, Item}). name(#ch{conn_name = ConnName, channel = Channel}) -> list_to_binary(rabbit_misc:format("~s (~p)", [ConnName, Channel])). maybe_incr_redeliver_stats(true, QPid, State) -> maybe_incr_stats([{QPid, 1}], redeliver, State); maybe_incr_redeliver_stats(_, _, _State) -> ok. maybe_incr_stats(QXIncs, Measure, State) -> case rabbit_event:stats_level(State, #ch.stats_timer) of fine -> [incr_stats(QX, Inc, Measure) || {QX, Inc} <- QXIncs]; _ -> ok end. incr_stats({_, _} = QX, Inc, Measure) -> update_measures(queue_exchange_stats, QX, Inc, Measure); incr_stats(QPid, Inc, Measure) when is_pid(QPid) -> update_measures(queue_stats, QPid, Inc, Measure); incr_stats(X, Inc, Measure) -> update_measures(exchange_stats, X, Inc, Measure). update_measures(Type, QX, Inc, Measure) -> Measures = case get({Type, QX}) of undefined -> []; D -> D end, Cur = case orddict:find(Measure, Measures) of error -> 0; {ok, C} -> C end, put({Type, QX}, orddict:store(Measure, Cur + Inc, Measures)). emit_stats(State) -> emit_stats(State, []). emit_stats(State, Extra) -> CoarseStats = infos(?STATISTICS_KEYS, State), case rabbit_event:stats_level(State, #ch.stats_timer) of coarse -> rabbit_event:notify(channel_stats, Extra ++ CoarseStats); fine -> FineStats = [{channel_queue_stats, [{QPid, Stats} || {{queue_stats, QPid}, Stats} <- get()]}, {channel_exchange_stats, [{X, Stats} || {{exchange_stats, X}, Stats} <- get()]}, {channel_queue_exchange_stats, [{QX, Stats} || {{queue_exchange_stats, QX}, Stats} <- get()]}], rabbit_event:notify(channel_stats, Extra ++ CoarseStats ++ FineStats) end. erase_queue_stats(QPid) -> erase({queue_stats, QPid}), [erase({queue_exchange_stats, QX}) || {{queue_exchange_stats, QX = {QPid0, _}}, _} <- get(), QPid =:= QPid0].