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rabbit_amqqueue.erl
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rabbit_amqqueue.erl
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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 Developer of the Original Code is GoPivotal, Inc.
%% Copyright (c) 2007-2017 Pivotal Software, Inc. All rights reserved.
%%
-module(rabbit_amqqueue).
-export([warn_file_limit/0]).
-export([recover/1, stop/1, start/1, declare/6, declare/7,
delete_immediately/1, delete_exclusive/2, delete/4, purge/1,
forget_all_durable/1, delete_crashed/1, delete_crashed/2,
delete_crashed_internal/2]).
-export([pseudo_queue/2, immutable/1]).
-export([lookup/1, not_found_or_absent/1, with/2, with/3, with_or_die/2,
assert_equivalence/5,
check_exclusive_access/2, with_exclusive_access_or_die/3,
stat/1, deliver/2, requeue/3, ack/3, reject/4]).
-export([list/0, list/1, info_keys/0, info/1, info/2, info_all/1, info_all/2,
emit_info_all/5, list_local/1, info_local/1,
emit_info_local/4, emit_info_down/4]).
-export([list_down/1, count/1, list_names/0, list_local_names/0]).
-export([force_event_refresh/1, notify_policy_changed/1]).
-export([consumers/1, consumers_all/1, emit_consumers_all/4, consumer_info_keys/0]).
-export([basic_get/4, basic_consume/11, basic_cancel/5, notify_decorators/1]).
-export([notify_sent/2, notify_sent_queue_down/1, resume/2]).
-export([notify_down_all/2, notify_down_all/3, activate_limit_all/2, credit/5]).
-export([on_node_up/1, on_node_down/1]).
-export([update/2, store_queue/1, update_decorators/1, policy_changed/2]).
-export([update_mirroring/1, sync_mirrors/1, cancel_sync_mirrors/1]).
-export([emit_unresponsive/6, emit_unresponsive_local/5, is_unresponsive/2]).
-export([is_mirrored/1, is_dead_exclusive/1]). % Note: exported due to use in qlc expression.
-export([pid_of/1, pid_of/2]).
-export([mark_local_durable_queues_stopped/1]).
%% internal
-export([internal_declare/2, internal_delete/2, run_backing_queue/3,
set_ram_duration_target/2, set_maximum_since_use/2,
emit_consumers_local/3, internal_delete/3]).
-include("rabbit.hrl").
-include_lib("stdlib/include/qlc.hrl").
-define(INTEGER_ARG_TYPES, [byte, short, signedint, long,
unsignedbyte, unsignedshort, unsignedint]).
-define(MORE_CONSUMER_CREDIT_AFTER, 50).
%%----------------------------------------------------------------------------
-export_type([name/0, qmsg/0, absent_reason/0]).
-type name() :: rabbit_types:r('queue').
-type qpids() :: [pid()].
-type qlen() :: rabbit_types:ok(non_neg_integer()).
-type qfun(A) :: fun ((rabbit_types:amqqueue()) -> A | no_return()).
-type qmsg() :: {name(), pid(), msg_id(), boolean(), rabbit_types:message()}.
-type msg_id() :: non_neg_integer().
-type ok_or_errors() ::
'ok' | {'error', [{'error' | 'exit' | 'throw', any()}]}.
-type absent_reason() :: 'nodedown' | 'crashed'.
-type queue_or_absent() :: rabbit_types:amqqueue() |
{'absent', rabbit_types:amqqueue(),absent_reason()}.
-type not_found_or_absent() ::
'not_found' | {'absent', rabbit_types:amqqueue(), absent_reason()}.
-spec recover(rabbit_types:vhost()) -> [rabbit_types:amqqueue()].
-spec stop(rabbit_types:vhost()) -> 'ok'.
-spec start([rabbit_types:amqqueue()]) -> 'ok'.
-spec declare
(name(), boolean(), boolean(), rabbit_framing:amqp_table(),
rabbit_types:maybe(pid()), rabbit_types:username()) ->
{'new' | 'existing' | 'absent' | 'owner_died',
rabbit_types:amqqueue()} |
rabbit_types:channel_exit().
-spec declare
(name(), boolean(), boolean(), rabbit_framing:amqp_table(),
rabbit_types:maybe(pid()), rabbit_types:username(), node()) ->
{'new' | 'existing' | 'owner_died', rabbit_types:amqqueue()} |
{'absent', rabbit_types:amqqueue(), absent_reason()} |
rabbit_types:channel_exit().
-spec internal_declare(rabbit_types:amqqueue(), boolean()) ->
queue_or_absent() | rabbit_misc:thunk(queue_or_absent()).
-spec update
(name(), fun((rabbit_types:amqqueue()) -> rabbit_types:amqqueue())) ->
'not_found' | rabbit_types:amqqueue().
-spec lookup
(name()) ->
rabbit_types:ok(rabbit_types:amqqueue()) |
rabbit_types:error('not_found');
([name()]) ->
[rabbit_types:amqqueue()].
-spec not_found_or_absent(name()) -> not_found_or_absent().
-spec with(name(), qfun(A)) ->
A | rabbit_types:error(not_found_or_absent()).
-spec with(name(), qfun(A), fun((not_found_or_absent()) -> B)) -> A | B.
-spec with_or_die(name(), qfun(A)) -> A | rabbit_types:channel_exit().
-spec assert_equivalence
(rabbit_types:amqqueue(), boolean(), boolean(),
rabbit_framing:amqp_table(), rabbit_types:maybe(pid())) ->
'ok' | rabbit_types:channel_exit() | rabbit_types:connection_exit().
-spec check_exclusive_access(rabbit_types:amqqueue(), pid()) ->
'ok' | rabbit_types:channel_exit().
-spec with_exclusive_access_or_die(name(), pid(), qfun(A)) ->
A | rabbit_types:channel_exit().
-spec list() -> [rabbit_types:amqqueue()].
-spec list(rabbit_types:vhost()) -> [rabbit_types:amqqueue()].
-spec list_names() -> [rabbit_amqqueue:name()].
-spec list_down(rabbit_types:vhost()) -> [rabbit_types:amqqueue()].
-spec info_keys() -> rabbit_types:info_keys().
-spec info(rabbit_types:amqqueue()) -> rabbit_types:infos().
-spec info(rabbit_types:amqqueue(), rabbit_types:info_keys()) ->
rabbit_types:infos().
-spec info_all(rabbit_types:vhost()) -> [rabbit_types:infos()].
-spec info_all(rabbit_types:vhost(), rabbit_types:info_keys()) ->
[rabbit_types:infos()].
-spec force_event_refresh(reference()) -> 'ok'.
-spec notify_policy_changed(rabbit_types:amqqueue()) -> 'ok'.
-spec consumers(rabbit_types:amqqueue()) ->
[{pid(), rabbit_types:ctag(), boolean(), non_neg_integer(),
rabbit_framing:amqp_table()}].
-spec consumer_info_keys() -> rabbit_types:info_keys().
-spec consumers_all(rabbit_types:vhost()) ->
[{name(), pid(), rabbit_types:ctag(), boolean(),
non_neg_integer(), rabbit_framing:amqp_table()}].
-spec stat(rabbit_types:amqqueue()) ->
{'ok', non_neg_integer(), non_neg_integer()}.
-spec delete_immediately(qpids()) -> 'ok'.
-spec delete_exclusive(qpids(), pid()) -> 'ok'.
-spec delete
(rabbit_types:amqqueue(), 'false', 'false', rabbit_types:username()) ->
qlen();
(rabbit_types:amqqueue(), 'true' , 'false', rabbit_types:username()) ->
qlen() | rabbit_types:error('in_use');
(rabbit_types:amqqueue(), 'false', 'true', rabbit_types:username()) ->
qlen() | rabbit_types:error('not_empty');
(rabbit_types:amqqueue(), 'true' , 'true', rabbit_types:username()) ->
qlen() |
rabbit_types:error('in_use') |
rabbit_types:error('not_empty').
-spec delete_crashed(rabbit_types:amqqueue()) -> 'ok'.
-spec delete_crashed_internal(rabbit_types:amqqueue(), rabbit_types:username()) -> 'ok'.
-spec purge(rabbit_types:amqqueue()) -> qlen().
-spec forget_all_durable(node()) -> 'ok'.
-spec deliver([rabbit_types:amqqueue()], rabbit_types:delivery()) ->
qpids().
-spec requeue(pid(), [msg_id()], pid()) -> 'ok'.
-spec ack(pid(), [msg_id()], pid()) -> 'ok'.
-spec reject(pid(), [msg_id()], boolean(), pid()) -> 'ok'.
-spec notify_down_all(qpids(), pid()) -> ok_or_errors().
-spec notify_down_all(qpids(), pid(), non_neg_integer()) ->
ok_or_errors().
-spec activate_limit_all(qpids(), pid()) -> ok_or_errors().
-spec basic_get(rabbit_types:amqqueue(), pid(), boolean(), pid()) ->
{'ok', non_neg_integer(), qmsg()} | 'empty'.
-spec credit
(rabbit_types:amqqueue(), pid(), rabbit_types:ctag(), non_neg_integer(),
boolean()) ->
'ok'.
-spec basic_consume
(rabbit_types:amqqueue(), boolean(), pid(), pid(), boolean(),
non_neg_integer(), rabbit_types:ctag(), boolean(),
rabbit_framing:amqp_table(), any(), rabbit_types:username()) ->
rabbit_types:ok_or_error('exclusive_consume_unavailable').
-spec basic_cancel
(rabbit_types:amqqueue(), pid(), rabbit_types:ctag(), any(),
rabbit_types:username()) -> 'ok'.
-spec notify_decorators(rabbit_types:amqqueue()) -> 'ok'.
-spec resume(pid(), pid()) -> 'ok'.
-spec internal_delete(name(), rabbit_types:username()) ->
'ok' | rabbit_types:connection_exit() |
fun (() ->
'ok' | rabbit_types:connection_exit()).
-spec run_backing_queue
(pid(), atom(), (fun ((atom(), A) -> {[rabbit_types:msg_id()], A}))) ->
'ok'.
-spec set_ram_duration_target(pid(), number() | 'infinity') -> 'ok'.
-spec set_maximum_since_use(pid(), non_neg_integer()) -> 'ok'.
-spec on_node_up(node()) -> 'ok'.
-spec on_node_down(node()) -> 'ok'.
-spec pseudo_queue(name(), pid()) -> rabbit_types:amqqueue().
-spec immutable(rabbit_types:amqqueue()) -> rabbit_types:amqqueue().
-spec store_queue(rabbit_types:amqqueue()) -> 'ok'.
-spec update_decorators(name()) -> 'ok'.
-spec policy_changed(rabbit_types:amqqueue(), rabbit_types:amqqueue()) ->
'ok'.
-spec update_mirroring(pid()) -> 'ok'.
-spec sync_mirrors(rabbit_types:amqqueue() | pid()) ->
'ok' | rabbit_types:error('not_mirrored').
-spec cancel_sync_mirrors(rabbit_types:amqqueue() | pid()) ->
'ok' | {'ok', 'not_syncing'}.
-spec is_mirrored(rabbit_types:amqqueue()) -> boolean().
-spec pid_of(rabbit_types:amqqueue()) ->
{'ok', pid()} | rabbit_types:error('not_found').
-spec pid_of(rabbit_types:vhost(), rabbit_misc:resource_name()) ->
{'ok', pid()} | rabbit_types:error('not_found').
%%----------------------------------------------------------------------------
-define(CONSUMER_INFO_KEYS,
[queue_name, channel_pid, consumer_tag, ack_required, prefetch_count,
arguments]).
warn_file_limit() ->
DurableQueues = find_durable_queues(),
L = length(DurableQueues),
%% if there are not enough file handles, the server might hang
%% when trying to recover queues, warn the user:
case file_handle_cache:get_limit() < L of
true ->
rabbit_log:warning(
"Recovering ~p queues, available file handles: ~p. Please increase max open file handles limit to at least ~p!~n",
[L, file_handle_cache:get_limit(), L]);
false ->
ok
end.
recover(VHost) ->
Queues = find_durable_queues(VHost),
{ok, BQ} = application:get_env(rabbit, backing_queue_module),
%% We rely on BQ:start/1 returning the recovery terms in the same
%% order as the supplied queue names, so that we can zip them together
%% for further processing in recover_durable_queues.
{ok, OrderedRecoveryTerms} =
BQ:start(VHost, [QName || #amqqueue{name = QName} <- Queues]),
case rabbit_amqqueue_sup_sup:start_for_vhost(VHost) of
{ok, _} ->
recover_durable_queues(lists:zip(Queues, OrderedRecoveryTerms));
{error, Reason} ->
rabbit_log:error("Failed to start queue supervisor for vhost '~s': ~s", [VHost, Reason]),
throw({error, Reason})
end.
stop(VHost) ->
ok = rabbit_amqqueue_sup_sup:stop_for_vhost(VHost),
{ok, BQ} = application:get_env(rabbit, backing_queue_module),
ok = BQ:stop(VHost).
start(Qs) ->
%% At this point all recovered queues and their bindings are
%% visible to routing, so now it is safe for them to complete
%% their initialisation (which may involve interacting with other
%% queues).
[Pid ! {self(), go} || #amqqueue{pid = Pid} <- Qs],
ok.
mark_local_durable_queues_stopped(VHost) ->
Qs = find_durable_queues(VHost),
rabbit_misc:execute_mnesia_transaction(
fun() ->
[ store_queue(Q#amqqueue{ state = stopped })
|| Q = #amqqueue{ state = State } <- Qs,
State =/= stopped ]
end).
find_durable_queues(VHost) ->
Node = node(),
mnesia:async_dirty(
fun () ->
qlc:e(qlc:q([Q || Q = #amqqueue{name = Name,
vhost = VH,
pid = Pid}
<- mnesia:table(rabbit_durable_queue),
VH =:= VHost,
node(Pid) == Node andalso
%% Terminations on node down will not remove the rabbit_queue
%% record if it is a mirrored queue (such info is now obtained from
%% the policy). Thus, we must check if the local pid is alive
%% - if the record is present - in order to restart.
(mnesia:read(rabbit_queue, Name, read) =:= []
orelse not erlang:is_process_alive(Pid))]))
end).
find_durable_queues() ->
Node = node(),
mnesia:async_dirty(
fun () ->
qlc:e(qlc:q([Q || Q = #amqqueue{name = Name,
pid = Pid}
<- mnesia:table(rabbit_durable_queue),
node(Pid) == Node andalso
%% Terminations on node down will not remove the rabbit_queue
%% record if it is a mirrored queue (such info is now obtained from
%% the policy). Thus, we must check if the local pid is alive
%% - if the record is present - in order to restart.
(mnesia:read(rabbit_queue, Name, read) =:= []
orelse not erlang:is_process_alive(Pid))]))
end).
recover_durable_queues(QueuesAndRecoveryTerms) ->
{Results, Failures} =
gen_server2:mcall(
[{rabbit_amqqueue_sup_sup:start_queue_process(node(), Q, recovery),
{init, {self(), Terms}}} || {Q, Terms} <- QueuesAndRecoveryTerms]),
[rabbit_log:error("Queue ~p failed to initialise: ~p~n",
[Pid, Error]) || {Pid, Error} <- Failures],
[Q || {_, {new, Q}} <- Results].
declare(QueueName, Durable, AutoDelete, Args, Owner, ActingUser) ->
declare(QueueName, Durable, AutoDelete, Args, Owner, ActingUser, node()).
%% The Node argument suggests where the queue (master if mirrored)
%% should be. Note that in some cases (e.g. with "nodes" policy in
%% effect) this might not be possible to satisfy.
declare(QueueName = #resource{virtual_host = VHost}, Durable, AutoDelete, Args,
Owner, ActingUser, Node) ->
ok = check_declare_arguments(QueueName, Args),
Q = rabbit_queue_decorator:set(
rabbit_policy:set(#amqqueue{name = QueueName,
durable = Durable,
auto_delete = AutoDelete,
arguments = Args,
exclusive_owner = Owner,
pid = none,
slave_pids = [],
sync_slave_pids = [],
recoverable_slaves = [],
gm_pids = [],
state = live,
policy_version = 0,
slave_pids_pending_shutdown = [],
vhost = VHost,
options = #{user => ActingUser}})),
Node1 = case rabbit_queue_master_location_misc:get_location(Q) of
{ok, Node0} -> Node0;
{error, _} -> Node
end,
Node1 = rabbit_mirror_queue_misc:initial_queue_node(Q, Node1),
case rabbit_vhost_sup_sup:get_vhost_sup(VHost, Node1) of
{ok, _} ->
gen_server2:call(
rabbit_amqqueue_sup_sup:start_queue_process(Node1, Q, declare),
{init, new}, infinity);
{error, Error} ->
rabbit_misc:protocol_error(internal_error,
"Cannot declare a queue '~s' on node '~s': ~255p",
[rabbit_misc:rs(QueueName), Node1, Error])
end.
internal_declare(Q, true) ->
rabbit_misc:execute_mnesia_tx_with_tail(
fun () ->
ok = store_queue(Q#amqqueue{state = live}),
rabbit_misc:const(Q)
end);
internal_declare(Q = #amqqueue{name = QueueName}, false) ->
rabbit_misc:execute_mnesia_tx_with_tail(
fun () ->
case mnesia:wread({rabbit_queue, QueueName}) of
[] ->
case not_found_or_absent(QueueName) of
not_found -> Q1 = rabbit_policy:set(Q),
Q2 = Q1#amqqueue{state = live},
ok = store_queue(Q2),
B = add_default_binding(Q1),
fun () -> B(), Q1 end;
{absent, _Q, _} = R -> rabbit_misc:const(R)
end;
[ExistingQ] ->
rabbit_misc:const(ExistingQ)
end
end).
update(Name, Fun) ->
case mnesia:wread({rabbit_queue, Name}) of
[Q = #amqqueue{durable = Durable}] ->
Q1 = Fun(Q),
ok = mnesia:write(rabbit_queue, Q1, write),
case Durable of
true -> ok = mnesia:write(rabbit_durable_queue, Q1, write);
_ -> ok
end,
Q1;
[] ->
not_found
end.
store_queue(Q = #amqqueue{durable = true}) ->
ok = mnesia:write(rabbit_durable_queue,
Q#amqqueue{slave_pids = [],
sync_slave_pids = [],
gm_pids = [],
decorators = undefined}, write),
store_queue_ram(Q);
store_queue(Q = #amqqueue{durable = false}) ->
store_queue_ram(Q).
store_queue_ram(Q) ->
ok = mnesia:write(rabbit_queue, rabbit_queue_decorator:set(Q), write).
update_decorators(Name) ->
rabbit_misc:execute_mnesia_transaction(
fun() ->
case mnesia:wread({rabbit_queue, Name}) of
[Q] -> store_queue_ram(Q),
ok;
[] -> ok
end
end).
policy_changed(Q1 = #amqqueue{decorators = Decorators1},
Q2 = #amqqueue{decorators = Decorators2}) ->
rabbit_mirror_queue_misc:update_mirrors(Q1, Q2),
D1 = rabbit_queue_decorator:select(Decorators1),
D2 = rabbit_queue_decorator:select(Decorators2),
[ok = M:policy_changed(Q1, Q2) || M <- lists:usort(D1 ++ D2)],
%% Make sure we emit a stats event even if nothing
%% mirroring-related has changed - the policy may have changed anyway.
notify_policy_changed(Q1).
add_default_binding(#amqqueue{name = QueueName}) ->
ExchangeName = rabbit_misc:r(QueueName, exchange, <<>>),
RoutingKey = QueueName#resource.name,
rabbit_binding:add(#binding{source = ExchangeName,
destination = QueueName,
key = RoutingKey,
args = []},
?INTERNAL_USER).
lookup([]) -> []; %% optimisation
lookup([Name]) -> ets:lookup(rabbit_queue, Name); %% optimisation
lookup(Names) when is_list(Names) ->
%% Normally we'd call mnesia:dirty_read/1 here, but that is quite
%% expensive for reasons explained in rabbit_misc:dirty_read/1.
lists:append([ets:lookup(rabbit_queue, Name) || Name <- Names]);
lookup(Name) ->
rabbit_misc:dirty_read({rabbit_queue, Name}).
not_found_or_absent(Name) ->
%% NB: we assume that the caller has already performed a lookup on
%% rabbit_queue and not found anything
case mnesia:read({rabbit_durable_queue, Name}) of
[] -> not_found;
[Q] -> {absent, Q, nodedown} %% Q exists on stopped node
end.
not_found_or_absent_dirty(Name) ->
%% We should read from both tables inside a tx, to get a
%% consistent view. But the chances of an inconsistency are small,
%% and only affect the error kind.
case rabbit_misc:dirty_read({rabbit_durable_queue, Name}) of
{error, not_found} -> not_found;
{ok, Q} -> {absent, Q, nodedown}
end.
with(Name, F, E) ->
with(Name, F, E, 2000).
with(Name, F, E, RetriesLeft) ->
case lookup(Name) of
{ok, Q = #amqqueue{state = live}} when RetriesLeft =:= 0 ->
%% Something bad happened to that queue, we are bailing out
%% on processing current request.
E({absent, Q, timeout});
{ok, Q = #amqqueue{state = stopped}} when RetriesLeft =:= 0 ->
%% The queue was stopped and not migrated
E({absent, Q, stopped});
%% The queue process has crashed with unknown error
{ok, Q = #amqqueue{state = crashed}} ->
E({absent, Q, crashed});
%% The queue process has been stopped by a supervisor.
%% In that case a synchronised slave can take over
%% so we should retry.
{ok, Q = #amqqueue{state = stopped}} ->
%% The queue process was stopped by the supervisor
rabbit_misc:with_exit_handler(
fun () -> retry_wait(Q, F, E, RetriesLeft) end,
fun () -> F(Q) end);
%% The queue is supposed to be active.
%% The master node can go away or queue can be killed
%% so we retry, waiting for a slave to take over.
{ok, Q = #amqqueue{state = live}} ->
%% We check is_process_alive(QPid) in case we receive a
%% nodedown (for example) in F() that has nothing to do
%% with the QPid. F() should be written s.t. that this
%% cannot happen, so we bail if it does since that
%% indicates a code bug and we don't want to get stuck in
%% the retry loop.
rabbit_misc:with_exit_handler(
fun () -> retry_wait(Q, F, E, RetriesLeft) end,
fun () -> F(Q) end);
{error, not_found} ->
E(not_found_or_absent_dirty(Name))
end.
retry_wait(Q = #amqqueue{pid = QPid, name = Name, state = QState}, F, E, RetriesLeft) ->
case {QState, is_mirrored(Q)} of
%% We don't want to repeat an operation if
%% there are no slaves to migrate to
{stopped, false} ->
E({absent, Q, stopped});
_ ->
false = rabbit_mnesia:is_process_alive(QPid),
timer:sleep(30),
with(Name, F, E, RetriesLeft - 1)
end.
with(Name, F) -> with(Name, F, fun (E) -> {error, E} end).
with_or_die(Name, F) ->
with(Name, F, fun (not_found) -> rabbit_misc:not_found(Name);
({absent, Q, Reason}) -> rabbit_misc:absent(Q, Reason)
end).
assert_equivalence(#amqqueue{name = QName,
durable = Durable,
auto_delete = AD} = Q,
Durable1, AD1, Args1, Owner) ->
rabbit_misc:assert_field_equivalence(Durable, Durable1, QName, durable),
rabbit_misc:assert_field_equivalence(AD, AD1, QName, auto_delete),
assert_args_equivalence(Q, Args1),
check_exclusive_access(Q, Owner, strict).
check_exclusive_access(Q, Owner) -> check_exclusive_access(Q, Owner, lax).
check_exclusive_access(#amqqueue{exclusive_owner = Owner}, Owner, _MatchType) ->
ok;
check_exclusive_access(#amqqueue{exclusive_owner = none}, _ReaderPid, lax) ->
ok;
check_exclusive_access(#amqqueue{name = QueueName}, _ReaderPid, _MatchType) ->
rabbit_misc:protocol_error(
resource_locked,
"cannot obtain exclusive access to locked ~s",
[rabbit_misc:rs(QueueName)]).
with_exclusive_access_or_die(Name, ReaderPid, F) ->
with_or_die(Name,
fun (Q) -> check_exclusive_access(Q, ReaderPid), F(Q) end).
assert_args_equivalence(#amqqueue{name = QueueName, arguments = Args},
RequiredArgs) ->
rabbit_misc:assert_args_equivalence(Args, RequiredArgs, QueueName,
[Key || {Key, _Fun} <- declare_args()]).
check_declare_arguments(QueueName, Args) ->
check_arguments(QueueName, Args, declare_args()).
check_consume_arguments(QueueName, Args) ->
check_arguments(QueueName, Args, consume_args()).
check_arguments(QueueName, Args, Validators) ->
[case rabbit_misc:table_lookup(Args, Key) of
undefined -> ok;
TypeVal -> case Fun(TypeVal, Args) of
ok -> ok;
{error, Error} -> rabbit_misc:protocol_error(
precondition_failed,
"invalid arg '~s' for ~s: ~255p",
[Key, rabbit_misc:rs(QueueName),
Error])
end
end || {Key, Fun} <- Validators],
ok.
declare_args() ->
[{<<"x-expires">>, fun check_expires_arg/2},
{<<"x-message-ttl">>, fun check_message_ttl_arg/2},
{<<"x-dead-letter-exchange">>, fun check_dlxname_arg/2},
{<<"x-dead-letter-routing-key">>, fun check_dlxrk_arg/2},
{<<"x-max-length">>, fun check_non_neg_int_arg/2},
{<<"x-max-length-bytes">>, fun check_non_neg_int_arg/2},
{<<"x-max-priority">>, fun check_max_priority_arg/2},
{<<"x-overflow">>, fun check_overflow/2},
{<<"x-queue-mode">>, fun check_queue_mode/2}].
consume_args() -> [{<<"x-priority">>, fun check_int_arg/2},
{<<"x-cancel-on-ha-failover">>, fun check_bool_arg/2}].
check_int_arg({Type, _}, _) ->
case lists:member(Type, ?INTEGER_ARG_TYPES) of
true -> ok;
false -> {error, {unacceptable_type, Type}}
end.
check_bool_arg({bool, _}, _) -> ok;
check_bool_arg({Type, _}, _) -> {error, {unacceptable_type, Type}}.
check_non_neg_int_arg({Type, Val}, Args) ->
case check_int_arg({Type, Val}, Args) of
ok when Val >= 0 -> ok;
ok -> {error, {value_negative, Val}};
Error -> Error
end.
check_expires_arg({Type, Val}, Args) ->
case check_int_arg({Type, Val}, Args) of
ok when Val == 0 -> {error, {value_zero, Val}};
ok -> rabbit_misc:check_expiry(Val);
Error -> Error
end.
check_message_ttl_arg({Type, Val}, Args) ->
case check_int_arg({Type, Val}, Args) of
ok -> rabbit_misc:check_expiry(Val);
Error -> Error
end.
check_max_priority_arg({Type, Val}, Args) ->
case check_non_neg_int_arg({Type, Val}, Args) of
ok when Val =< ?MAX_SUPPORTED_PRIORITY -> ok;
ok -> {error, {max_value_exceeded, Val}};
Error -> Error
end.
%% Note that the validity of x-dead-letter-exchange is already verified
%% by rabbit_channel's queue.declare handler.
check_dlxname_arg({longstr, _}, _) -> ok;
check_dlxname_arg({Type, _}, _) -> {error, {unacceptable_type, Type}}.
check_dlxrk_arg({longstr, _}, Args) ->
case rabbit_misc:table_lookup(Args, <<"x-dead-letter-exchange">>) of
undefined -> {error, routing_key_but_no_dlx_defined};
_ -> ok
end;
check_dlxrk_arg({Type, _}, _Args) ->
{error, {unacceptable_type, Type}}.
check_overflow({longstr, Val}, _Args) ->
case lists:member(Val, [<<"drop-head">>, <<"reject-publish">>]) of
true -> ok;
false -> {error, invalid_overflow}
end;
check_overflow({Type, _}, _Args) ->
{error, {unacceptable_type, Type}}.
check_queue_mode({longstr, Val}, _Args) ->
case lists:member(Val, [<<"default">>, <<"lazy">>]) of
true -> ok;
false -> {error, invalid_queue_mode}
end;
check_queue_mode({Type, _}, _Args) ->
{error, {unacceptable_type, Type}}.
list() -> mnesia:dirty_match_object(rabbit_queue, #amqqueue{_ = '_'}).
list_names() -> mnesia:dirty_all_keys(rabbit_queue).
list_local_names() ->
[ Q#amqqueue.name || #amqqueue{state = State, pid = QPid} = Q <- list(),
State =/= crashed,
node() =:= node(QPid) ].
list(VHostPath) ->
list(VHostPath, rabbit_queue).
%% Not dirty_match_object since that would not be transactional when used in a
%% tx context
list(VHostPath, TableName) ->
mnesia:async_dirty(
fun () ->
mnesia:match_object(
TableName,
#amqqueue{name = rabbit_misc:r(VHostPath, queue), _ = '_'},
read)
end).
list_down(VHostPath) ->
case rabbit_vhost:exists(VHostPath) of
false -> [];
true ->
Present = list(VHostPath),
Durable = list(VHostPath, rabbit_durable_queue),
PresentS = sets:from_list([N || #amqqueue{name = N} <- Present]),
sets:to_list(sets:filter(fun (#amqqueue{name = N}) ->
not sets:is_element(N, PresentS)
end, sets:from_list(Durable)))
end.
count(VHost) ->
try
%% this is certainly suboptimal but there is no way to count
%% things using a secondary index in Mnesia. Our counter-table-per-node
%% won't work here because with master migration of mirrored queues
%% the "ownership" of queues by nodes becomes a non-trivial problem
%% that requires a proper consensus algorithm.
length(mnesia:dirty_index_read(rabbit_queue, VHost, #amqqueue.vhost))
catch _:Err ->
rabbit_log:error("Failed to fetch number of queues in vhost ~p:~n~p~n",
[VHost, Err]),
0
end.
info_keys() -> rabbit_amqqueue_process:info_keys().
map(Qs, F) -> rabbit_misc:filter_exit_map(F, Qs).
is_unresponsive(#amqqueue{ state = crashed }, _Timeout) ->
false;
is_unresponsive(#amqqueue{ pid = QPid }, Timeout) ->
try
delegate:invoke(QPid, {gen_server2, call, [{info, [name]}, Timeout]}),
false
catch
%% TODO catch any exit??
exit:{timeout, _} ->
true
end.
info(Q = #amqqueue{ state = crashed }) -> info_down(Q, crashed);
info(Q = #amqqueue{ state = stopped }) -> info_down(Q, stopped);
info(#amqqueue{ pid = QPid }) -> delegate:invoke(QPid, {gen_server2, call, [info, infinity]}).
info(Q = #amqqueue{ state = crashed }, Items) ->
info_down(Q, Items, crashed);
info(Q = #amqqueue{ state = stopped }, Items) ->
info_down(Q, Items, stopped);
info(#amqqueue{ pid = QPid }, Items) ->
case delegate:invoke(QPid, {gen_server2, call, [{info, Items}, infinity]}) of
{ok, Res} -> Res;
{error, Error} -> throw(Error)
end.
info_down(Q, DownReason) ->
info_down(Q, rabbit_amqqueue_process:info_keys(), DownReason).
info_down(Q, Items, DownReason) ->
[{Item, i_down(Item, Q, DownReason)} || Item <- Items].
i_down(name, #amqqueue{name = Name}, _) -> Name;
i_down(durable, #amqqueue{durable = Dur}, _) -> Dur;
i_down(auto_delete, #amqqueue{auto_delete = AD}, _) -> AD;
i_down(arguments, #amqqueue{arguments = Args}, _) -> Args;
i_down(pid, #amqqueue{pid = QPid}, _) -> QPid;
i_down(recoverable_slaves, #amqqueue{recoverable_slaves = RS}, _) -> RS;
i_down(state, _Q, DownReason) -> DownReason;
i_down(K, _Q, _DownReason) ->
case lists:member(K, rabbit_amqqueue_process:info_keys()) of
true -> '';
false -> throw({bad_argument, K})
end.
info_all(VHostPath) ->
map(list(VHostPath), fun (Q) -> info(Q) end) ++
map(list_down(VHostPath), fun (Q) -> info_down(Q, down) end).
info_all(VHostPath, Items) ->
map(list(VHostPath), fun (Q) -> info(Q, Items) end) ++
map(list_down(VHostPath), fun (Q) -> info_down(Q, Items, down) end).
emit_info_local(VHostPath, Items, Ref, AggregatorPid) ->
rabbit_control_misc:emitting_map_with_exit_handler(
AggregatorPid, Ref, fun(Q) -> info(Q, Items) end, list_local(VHostPath)).
emit_info_all(Nodes, VHostPath, Items, Ref, AggregatorPid) ->
Pids = [ spawn_link(Node, rabbit_amqqueue, emit_info_local, [VHostPath, Items, Ref, AggregatorPid]) || Node <- Nodes ],
rabbit_control_misc:await_emitters_termination(Pids).
emit_info_down(VHostPath, Items, Ref, AggregatorPid) ->
rabbit_control_misc:emitting_map_with_exit_handler(
AggregatorPid, Ref, fun(Q) -> info_down(Q, Items, down) end,
list_down(VHostPath)).
emit_unresponsive_local(VHostPath, Items, Timeout, Ref, AggregatorPid) ->
rabbit_control_misc:emitting_map_with_exit_handler(
AggregatorPid, Ref, fun(Q) -> case is_unresponsive(Q, Timeout) of
true -> info_down(Q, Items, unresponsive);
false -> []
end
end, list_local(VHostPath)
).
emit_unresponsive(Nodes, VHostPath, Items, Timeout, Ref, AggregatorPid) ->
Pids = [ spawn_link(Node, rabbit_amqqueue, emit_unresponsive_local,
[VHostPath, Items, Timeout, Ref, AggregatorPid]) || Node <- Nodes ],
rabbit_control_misc:await_emitters_termination(Pids).
info_local(VHostPath) ->
map(list_local(VHostPath), fun (Q) -> info(Q, [name]) end).
list_local(VHostPath) ->
[ Q || #amqqueue{state = State, pid=QPid} = Q <- list(VHostPath),
State =/= crashed,
node() =:= node(QPid) ].
force_event_refresh(Ref) ->
[gen_server2:cast(Q#amqqueue.pid,
{force_event_refresh, Ref}) || Q <- list()],
ok.
notify_policy_changed(#amqqueue{pid = QPid}) ->
gen_server2:cast(QPid, policy_changed).
consumers(#amqqueue{ pid = QPid }) ->
delegate:invoke(QPid, {gen_server2, call, [consumers, infinity]}).
consumer_info_keys() -> ?CONSUMER_INFO_KEYS.
consumers_all(VHostPath) ->
ConsumerInfoKeys = consumer_info_keys(),
lists:append(
map(list(VHostPath),
fun(Q) -> get_queue_consumer_info(Q, ConsumerInfoKeys) end)).
emit_consumers_all(Nodes, VHostPath, Ref, AggregatorPid) ->
Pids = [ spawn_link(Node, rabbit_amqqueue, emit_consumers_local, [VHostPath, Ref, AggregatorPid]) || Node <- Nodes ],
rabbit_control_misc:await_emitters_termination(Pids),
ok.
emit_consumers_local(VHostPath, Ref, AggregatorPid) ->
ConsumerInfoKeys = consumer_info_keys(),
rabbit_control_misc:emitting_map(
AggregatorPid, Ref,
fun(Q) -> get_queue_consumer_info(Q, ConsumerInfoKeys) end,
list_local(VHostPath)).
get_queue_consumer_info(Q, ConsumerInfoKeys) ->
[lists:zip(ConsumerInfoKeys,
[Q#amqqueue.name, ChPid, CTag,
AckRequired, Prefetch, Args]) ||
{ChPid, CTag, AckRequired, Prefetch, Args, _} <- consumers(Q)].
stat(#amqqueue{pid = QPid}) -> delegate:invoke(QPid, {gen_server2, call, [stat, infinity]}).
pid_of(#amqqueue{pid = Pid}) -> Pid.
pid_of(VHost, QueueName) ->
case lookup(rabbit_misc:r(VHost, queue, QueueName)) of
{ok, Q} -> pid_of(Q);
{error, not_found} = E -> E
end.
delete_exclusive(QPids, ConnId) ->
[gen_server2:cast(QPid, {delete_exclusive, ConnId}) || QPid <- QPids],
ok.
delete_immediately(QPids) ->
[gen_server2:cast(QPid, delete_immediately) || QPid <- QPids],
ok.
delete(Q, IfUnused, IfEmpty, ActingUser) ->
case wait_for_promoted_or_stopped(Q) of
{promoted, #amqqueue{pid = QPid}} ->
delegate:invoke(QPid, {gen_server2, call, [{delete, IfUnused, IfEmpty, ActingUser}, infinity]});
{stopped, Q1} ->
#resource{name = Name, virtual_host = Vhost} = Q1#amqqueue.name,
case IfEmpty of
true ->
rabbit_log:error("Queue ~s in vhost ~s has its master node down and "
"no mirrors available or eligible for promotion. "
"The queue may be non-empty. "
"Refusing to force-delete.",
[Name, Vhost]),
{error, not_empty};
false ->
rabbit_log:warning("Queue ~s in vhost ~s has its master node is down and "
"no mirrors available or eligible for promotion. "
"Forcing queue deletion.",
[Name, Vhost]),
delete_crashed_internal(Q1, ActingUser),
{ok, 0}
end;
{error, not_found} ->
%% Assume the queue was deleted
{ok, 0}
end.
-spec wait_for_promoted_or_stopped(#amqqueue{}) -> {promoted, #amqqueue{}} | {stopped, #amqqueue{}} | {error, not_found}.
wait_for_promoted_or_stopped(#amqqueue{name = QName}) ->
case lookup(QName) of
{ok, Q = #amqqueue{pid = QPid, slave_pids = SPids}} ->
case rabbit_mnesia:is_process_alive(QPid) of
true -> {promoted, Q};
false ->
case lists:any(fun(Pid) ->
rabbit_mnesia:is_process_alive(Pid)
end, SPids) of
%% There is a live slave. May be promoted
true ->
timer:sleep(100),
wait_for_promoted_or_stopped(Q);
%% All slave pids are stopped.
%% No process left for the queue
false -> {stopped, Q}
end
end;
{error, not_found} ->
{error, not_found}
end.
delete_crashed(Q) ->
delete_crashed(Q, ?INTERNAL_USER).
delete_crashed(#amqqueue{ pid = QPid } = Q, ActingUser) ->
ok = rpc:call(node(QPid), ?MODULE, delete_crashed_internal, [Q, ActingUser]).
delete_crashed_internal(Q = #amqqueue{ name = QName }, ActingUser) ->
{ok, BQ} = application:get_env(rabbit, backing_queue_module),
BQ:delete_crashed(Q),
ok = internal_delete(QName, ActingUser).
purge(#amqqueue{ pid = QPid }) ->
delegate:invoke(QPid, {gen_server2, call, [purge, infinity]}).
requeue(QPid, MsgIds, ChPid) ->
delegate:invoke(QPid, {gen_server2, call, [{requeue, MsgIds, ChPid}, infinity]}).
ack(QPid, MsgIds, ChPid) ->
delegate:invoke_no_result(QPid, {gen_server2, cast, [{ack, MsgIds, ChPid}]}).
reject(QPid, Requeue, MsgIds, ChPid) ->
delegate:invoke_no_result(QPid, {gen_server2, cast, [{reject, Requeue, MsgIds, ChPid}]}).
notify_down_all(QPids, ChPid) ->
notify_down_all(QPids, ChPid, ?CHANNEL_OPERATION_TIMEOUT).
notify_down_all(QPids, ChPid, Timeout) ->
case rpc:call(node(), delegate, invoke,
[QPids, {gen_server2, call, [{notify_down, ChPid}, infinity]}], Timeout) of
{badrpc, timeout} -> {error, {channel_operation_timeout, Timeout}};
{badrpc, Reason} -> {error, Reason};
{_, Bads} ->
case lists:filter(
fun ({_Pid, {exit, {R, _}, _}}) ->
rabbit_misc:is_abnormal_exit(R);
({_Pid, _}) -> false
end, Bads) of
[] -> ok;
Bads1 -> {error, Bads1}
end;
Error -> {error, Error}
end.
activate_limit_all(QPids, ChPid) ->
delegate:invoke_no_result(QPids, {gen_server2, cast, [{activate_limit, ChPid}]}).
credit(#amqqueue{pid = QPid}, ChPid, CTag, Credit, Drain) ->
delegate:invoke_no_result(QPid, {gen_server2, cast, [{credit, ChPid, CTag, Credit, Drain}]}).
basic_get(#amqqueue{pid = QPid}, ChPid, NoAck, LimiterPid) ->
delegate:invoke(QPid, {gen_server2, call, [{basic_get, ChPid, NoAck, LimiterPid}, infinity]}).
basic_consume(#amqqueue{pid = QPid, name = QName}, NoAck, ChPid, LimiterPid,
LimiterActive, ConsumerPrefetchCount, ConsumerTag,
ExclusiveConsume, Args, OkMsg, ActingUser) ->
ok = check_consume_arguments(QName, Args),
delegate:invoke(QPid, {gen_server2, call,
[{basic_consume, NoAck, ChPid, LimiterPid, LimiterActive,
ConsumerPrefetchCount, ConsumerTag, ExclusiveConsume,
Args, OkMsg, ActingUser}, infinity]}).
basic_cancel(#amqqueue{pid = QPid}, ChPid, ConsumerTag, OkMsg, ActingUser) ->
delegate:invoke(QPid, {gen_server2, call,
[{basic_cancel, ChPid, ConsumerTag, OkMsg, ActingUser}, infinity]}).
notify_decorators(#amqqueue{pid = QPid}) ->
delegate:invoke_no_result(QPid, {gen_server2, cast, [notify_decorators]}).
notify_sent(QPid, ChPid) ->
rabbit_amqqueue_common:notify_sent(QPid, ChPid).
notify_sent_queue_down(QPid) ->
rabbit_amqqueue_common:notify_sent_queue_down(QPid).
resume(QPid, ChPid) -> delegate:invoke_no_result(QPid, {gen_server2, cast, [{resume, ChPid}]}).
internal_delete1(QueueName, OnlyDurable) ->
internal_delete1(QueueName, OnlyDurable, normal).
internal_delete1(QueueName, OnlyDurable, Reason) ->
ok = mnesia:delete({rabbit_queue, QueueName}),
case Reason of
auto_delete ->
case mnesia:wread({rabbit_durable_queue, QueueName}) of
[] -> ok;
[_] -> ok = mnesia:delete({rabbit_durable_queue, QueueName})
end;
_ ->
mnesia:delete({rabbit_durable_queue, QueueName})
end,
%% we want to execute some things, as decided by rabbit_exchange,
%% after the transaction.
rabbit_binding:remove_for_destination(QueueName, OnlyDurable).
internal_delete(QueueName, ActingUser) ->
internal_delete(QueueName, ActingUser, normal).
internal_delete(QueueName, ActingUser, Reason) ->
rabbit_misc:execute_mnesia_tx_with_tail(
fun () ->
case {mnesia:wread({rabbit_queue, QueueName}),
mnesia:wread({rabbit_durable_queue, QueueName})} of
{[], []} ->
rabbit_misc:const(ok);
_ ->
Deletions = internal_delete1(QueueName, false, Reason),
T = rabbit_binding:process_deletions(Deletions,
?INTERNAL_USER),