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%% This Source Code Form is subject to the terms of the Mozilla Public
%% License, v. 2.0. If a copy of the MPL was not distributed with this
%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
%%
%% Copyright (c) 2007-2021 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(rabbit_sharding_shard).
-include_lib("rabbit_common/include/rabbit.hrl").
-export([maybe_shard_exchanges/0,
ensure_sharded_queues/1,
maybe_update_shards/2,
stop_sharding/1]).
-import(rabbit_misc, [r/3]).
-import(rabbit_sharding_util, [a2b/1, exchange_bin/1, make_queue_name/3,
routing_key/1, shards_per_node/1]).
-rabbit_boot_step({rabbit_sharding_maybe_shard,
[{description, "rabbit sharding maybe shard"},
{mfa, {?MODULE, maybe_shard_exchanges, []}},
{requires, recovery}]}).
-define(MAX_CONNECTION_CLOSE_TIMEOUT, 10000).
-define(SHARDING_USER, <<"rmq-sharding">>).
%% We make sure the sharded queues are created when
%% RabbitMQ starts.
maybe_shard_exchanges() ->
[maybe_shard_exchanges(V) || V <- rabbit_vhost:list_names()],
ok.
maybe_shard_exchanges(VHost) ->
[ensure_sharded_queues(X) ||
X <- rabbit_sharding_util:sharded_exchanges(VHost)].
%% queue needs to be declared on the respective node.
ensure_sharded_queues(X) ->
add_queues(X),
bind_queues(X).
maybe_update_shards(OldX, NewX) ->
maybe_unbind_queues(routing_key(OldX), routing_key(NewX), OldX),
add_queues(NewX),
bind_queues(NewX).
stop_sharding(OldX) ->
unbind_queues(shards_per_node(OldX), OldX).
%% routing key didn't change. Do nothing.
maybe_unbind_queues(RK, RK, _OldX) ->
ok;
maybe_unbind_queues(_RK, _NewRK, OldX) ->
unbind_queues(shards_per_node(OldX), OldX).
unbind_queues(undefined, _X) ->
ok;
unbind_queues(OldSPN, #exchange{name = XName} = X) ->
OldRKey = routing_key(X),
foreach_node(fun(Node) ->
[unbind_queue(XName, OldRKey, N, Node)
|| N <- lists:seq(0, OldSPN-1)]
end).
add_queues(#exchange{name = XName, durable = Durable} = X) ->
SPN = shards_per_node(X),
foreach_node(fun(Node) ->
[declare_queue(XName, Durable, N, Node)
|| N <- lists:seq(0, SPN-1)]
end).
bind_queues(#exchange{name = XName} = X) ->
RKey = routing_key(X),
SPN = shards_per_node(X),
foreach_node(fun(Node) ->
[bind_queue(XName, RKey, N, Node) ||
N <- lists:seq(0, SPN-1)]
end).
%%----------------------------------------------------------------------------
declare_queue(XName, Durable, N, Node) ->
QBin = make_queue_name(exchange_bin(XName), a2b(Node), N),
QueueName = rabbit_misc:r(v(XName), queue, QBin),
try rabbit_amqqueue:declare(QueueName, Durable, false, [], none,
?SHARDING_USER, {ignore_location, Node}) of
{_Reply, _Q} ->
ok
catch
_Error:Reason ->
rabbit_log:error("sharding failed to declare queue for exchange ~p"
" - soft error:~n~p~n",
[exchange_bin(XName), Reason]),
error
end.
bind_queue(XName, RoutingKey, N, Node) ->
binding_action(fun rabbit_binding:add/3,
XName, RoutingKey, N, Node,
"sharding failed to bind queue ~p to exchange ~p"
" - soft error:~n~p~n").
unbind_queue(XName, RoutingKey, N, Node) ->
binding_action(fun rabbit_binding:remove/3,
XName, RoutingKey, N, Node,
"sharding failed to unbind queue ~p to exchange ~p"
" - soft error:~n~p~n").
binding_action(F, XName, RoutingKey, N, Node, ErrMsg) ->
QBin = make_queue_name(exchange_bin(XName), a2b(Node), N),
QueueName = rabbit_misc:r(v(XName), queue, QBin),
case F(#binding{source = XName,
destination = QueueName,
key = RoutingKey,
args = []},
fun (_X, _Q) -> ok end,
?SHARDING_USER) of
ok -> ok;
{error, Reason} ->
rabbit_log:error(ErrMsg, [QBin, exchange_bin(XName), Reason]),
error
end.
v(#resource{virtual_host = VHost}) ->
VHost.
foreach_node(F) ->
[F(Node) || Node <- running_nodes()].
running_nodes() ->
proplists:get_value(running_nodes, rabbit_mnesia:status(), []).
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