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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) 2013-2020 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(rabbit_routing_util).
-export([init_state/0, dest_prefixes/0, all_dest_prefixes/0]).
-export([ensure_endpoint/4, ensure_endpoint/5, ensure_binding/3]).
-export([parse_endpoint/1, parse_endpoint/2]).
-export([parse_routing/1, dest_temp_queue/1]).
-include("amqp_client.hrl").
-include("rabbit_routing_prefixes.hrl").
%%----------------------------------------------------------------------------
init_state() -> sets:new().
dest_prefixes() -> [?EXCHANGE_PREFIX, ?TOPIC_PREFIX, ?QUEUE_PREFIX,
?AMQQUEUE_PREFIX, ?REPLY_QUEUE_PREFIX].
all_dest_prefixes() -> [?TEMP_QUEUE_PREFIX | dest_prefixes()].
%% --------------------------------------------------------------------------
parse_endpoint(Destination) ->
parse_endpoint(Destination, false).
parse_endpoint(undefined, AllowAnonymousQueue) ->
parse_endpoint("/queue", AllowAnonymousQueue);
parse_endpoint(Destination, AllowAnonymousQueue) when is_binary(Destination) ->
parse_endpoint(unicode:characters_to_list(Destination),
AllowAnonymousQueue);
parse_endpoint(Destination, AllowAnonymousQueue) when is_list(Destination) ->
case re:split(Destination, "/", [{return, list}]) of
[Name] ->
{ok, {queue, unescape(Name)}};
["", Type | Rest]
when Type =:= "exchange" orelse Type =:= "queue" orelse
Type =:= "topic" orelse Type =:= "temp-queue" ->
parse_endpoint0(atomise(Type), Rest, AllowAnonymousQueue);
["", "amq", "queue" | Rest] ->
parse_endpoint0(amqqueue, Rest, AllowAnonymousQueue);
["", "reply-queue" = Prefix | [_|_]] ->
parse_endpoint0(reply_queue,
[lists:nthtail(2 + length(Prefix), Destination)],
AllowAnonymousQueue);
_ ->
{error, {unknown_destination, Destination}}
end.
parse_endpoint0(exchange, ["" | _] = Rest, _) ->
{error, {invalid_destination, exchange, to_url(Rest)}};
parse_endpoint0(exchange, [Name], _) ->
{ok, {exchange, {unescape(Name), undefined}}};
parse_endpoint0(exchange, [Name, Pattern], _) ->
{ok, {exchange, {unescape(Name), unescape(Pattern)}}};
parse_endpoint0(queue, [], false) ->
{error, {invalid_destination, queue, []}};
parse_endpoint0(queue, [], true) ->
{ok, {queue, undefined}};
parse_endpoint0(Type, [[_|_]] = [Name], _) ->
{ok, {Type, unescape(Name)}};
parse_endpoint0(Type, Rest, _) ->
{error, {invalid_destination, Type, to_url(Rest)}}.
%% --------------------------------------------------------------------------
ensure_endpoint(Dir, Channel, Endpoint, State) ->
ensure_endpoint(Dir, Channel, Endpoint, [], State).
ensure_endpoint(source, Channel, {exchange, {Name, _}}, Params, State) ->
check_exchange(Name, Channel,
proplists:get_value(check_exchange, Params, false)),
Method = queue_declare_method(#'queue.declare'{}, exchange, Params),
#'queue.declare_ok'{queue = Queue} = amqp_channel:call(Channel, Method),
{ok, Queue, State};
ensure_endpoint(source, Channel, {topic, _}, Params, State) ->
Method = queue_declare_method(#'queue.declare'{}, topic, Params),
#'queue.declare_ok'{queue = Queue} = amqp_channel:call(Channel, Method),
{ok, Queue, State};
ensure_endpoint(_Dir, _Channel, {queue, undefined}, _Params, State) ->
{ok, undefined, State};
ensure_endpoint(_, Channel, {queue, Name}, Params, State) ->
Params1 = rabbit_misc:pmerge(durable, true, Params),
Queue = list_to_binary(Name),
State1 = case sets:is_element(Queue, State) of
true -> State;
_ -> Method = queue_declare_method(
#'queue.declare'{queue = Queue,
nowait = true},
queue, Params1),
case Method#'queue.declare'.nowait of
true -> amqp_channel:cast(Channel, Method);
false -> amqp_channel:call(Channel, Method)
end,
sets:add_element(Queue, State)
end,
{ok, Queue, State1};
ensure_endpoint(dest, Channel, {exchange, {Name, _}}, Params, State) ->
check_exchange(Name, Channel,
proplists:get_value(check_exchange, Params, false)),
{ok, undefined, State};
ensure_endpoint(dest, _Ch, {topic, _}, _Params, State) ->
{ok, undefined, State};
ensure_endpoint(_, _Ch, {amqqueue, Name}, _Params, State) ->
{ok, list_to_binary(Name), State};
ensure_endpoint(_, _Ch, {reply_queue, Name}, _Params, State) ->
{ok, list_to_binary(Name), State};
ensure_endpoint(_Direction, _Ch, _Endpoint, _Params, _State) ->
{error, invalid_endpoint}.
%% --------------------------------------------------------------------------
ensure_binding(QueueBin, {"", Queue}, _Channel) ->
%% i.e., we should only be asked to bind to the default exchange a
%% queue with its own name
QueueBin = list_to_binary(Queue),
ok;
ensure_binding(Queue, {Exchange, RoutingKey}, Channel) ->
#'queue.bind_ok'{} =
amqp_channel:call(Channel,
#'queue.bind'{
queue = Queue,
exchange = list_to_binary(Exchange),
routing_key = list_to_binary(RoutingKey)}),
ok.
%% --------------------------------------------------------------------------
parse_routing({exchange, {Name, undefined}}) ->
{Name, ""};
parse_routing({exchange, {Name, Pattern}}) ->
{Name, Pattern};
parse_routing({topic, Name}) ->
{"amq.topic", Name};
parse_routing({Type, Name})
when Type =:= queue orelse Type =:= reply_queue orelse Type =:= amqqueue ->
{"", Name}.
dest_temp_queue({temp_queue, Name}) -> Name;
dest_temp_queue(_) -> none.
%% --------------------------------------------------------------------------
check_exchange(_, _, false) ->
ok;
check_exchange(ExchangeName, Channel, true) ->
XDecl = #'exchange.declare'{ exchange = list_to_binary(ExchangeName),
passive = true },
#'exchange.declare_ok'{} = amqp_channel:call(Channel, XDecl),
ok.
update_queue_declare_arguments(Method, Params) ->
Method#'queue.declare'{arguments =
proplists:get_value(arguments, Params, [])}.
update_queue_declare_exclusive(Method, Params) ->
case proplists:get_value(exclusive, Params) of
undefined -> Method;
Val -> Method#'queue.declare'{exclusive = Val}
end.
update_queue_declare_auto_delete(Method, Params) ->
case proplists:get_value(auto_delete, Params) of
undefined -> Method;
Val -> Method#'queue.declare'{auto_delete = Val}
end.
update_queue_declare_nowait(Method, Params) ->
case proplists:get_value(nowait, Params) of
undefined -> Method;
Val -> Method#'queue.declare'{nowait = Val}
end.
queue_declare_method(#'queue.declare'{} = Method, Type, Params) ->
%% defaults
Method1 = case proplists:get_value(durable, Params, false) of
true -> Method#'queue.declare'{durable = true};
false -> Method#'queue.declare'{auto_delete = true,
exclusive = true}
end,
%% set the rest of queue.declare fields from Params
Method2 = lists:foldl(fun (F, Acc) -> F(Acc, Params) end,
Method1, [fun update_queue_declare_arguments/2,
fun update_queue_declare_exclusive/2,
fun update_queue_declare_auto_delete/2,
fun update_queue_declare_nowait/2]),
case {Type, proplists:get_value(subscription_queue_name_gen, Params)} of
{topic, SQNG} when is_function(SQNG) ->
Method2#'queue.declare'{queue = SQNG()};
{exchange, SQNG} when is_function(SQNG) ->
Method2#'queue.declare'{queue = SQNG()};
_ ->
Method2
end.
%% --------------------------------------------------------------------------
to_url([]) -> [];
to_url(Lol) -> "/" ++ string:join(Lol, "/").
atomise(Name) when is_list(Name) ->
list_to_atom(re:replace(Name, "-", "_", [{return,list}, global])).
unescape(Str) -> unescape(Str, []).
unescape("%2F" ++ Str, Acc) -> unescape(Str, [$/ | Acc]);
unescape([C | Str], Acc) -> unescape(Str, [C | Acc]);
unescape([], Acc) -> lists:reverse(Acc).
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