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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) 2011-2021 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(rabbit_mgmt_wm_queue_get).
-export([init/2, resource_exists/2, is_authorized/2,
allowed_methods/2, accept_content/2, content_types_provided/2,
content_types_accepted/2]).
-export([variances/2]).
-include_lib("rabbitmq_management_agent/include/rabbit_mgmt_records.hrl").
-include_lib("amqp_client/include/amqp_client.hrl").
%%--------------------------------------------------------------------
init(Req, _State) ->
{cowboy_rest, rabbit_mgmt_headers:set_common_permission_headers(Req, ?MODULE), #context{}}.
variances(Req, Context) ->
{[<<"accept-encoding">>, <<"origin">>], Req, Context}.
allowed_methods(ReqData, Context) ->
{[<<"POST">>, <<"OPTIONS">>], ReqData, Context}.
content_types_provided(ReqData, Context) ->
{rabbit_mgmt_util:responder_map(to_json), ReqData, Context}.
resource_exists(ReqData, Context) ->
{case rabbit_mgmt_wm_queue:queue(ReqData) of
not_found -> false;
_ -> true
end, ReqData, Context}.
content_types_accepted(ReqData, Context) ->
{[{'*', accept_content}], ReqData, Context}.
accept_content(ReqData, Context) ->
rabbit_mgmt_util:post_respond(do_it(ReqData, Context)).
do_it(ReqData0, Context) ->
VHost = rabbit_mgmt_util:vhost(ReqData0),
Q = rabbit_mgmt_util:id(queue, ReqData0),
rabbit_mgmt_util:with_decode(
[ackmode, count, encoding], ReqData0, Context,
fun([AckModeBin, CountBin, EncBin], Body, ReqData) ->
rabbit_mgmt_util:with_channel(
VHost, ReqData, Context,
fun (Ch) ->
AckMode = list_to_atom(binary_to_list(AckModeBin)),
Count = rabbit_mgmt_util:parse_int(CountBin),
Enc = case EncBin of
<<"auto">> -> auto;
<<"base64">> -> base64;
_ -> throw({error, <<"Unsupported encoding. Please use auto or base64.">>})
end,
Trunc = case maps:get(truncate, Body, undefined) of
undefined -> none;
TruncBin -> rabbit_mgmt_util:parse_int(
TruncBin)
end,
Reply = basic_gets(Count, Ch, Q, AckMode, Enc, Trunc),
maybe_rejects(Reply, Ch, AckMode),
rabbit_mgmt_util:reply(remove_delivery_tag(Reply),
ReqData, Context)
end)
end).
basic_gets(0, _, _, _, _, _) ->
[];
basic_gets(Count, Ch, Q, AckMode, Enc, Trunc) ->
case basic_get(Ch, Q, AckMode, Enc, Trunc) of
none -> [];
M -> [M | basic_gets(Count - 1, Ch, Q, AckMode, Enc, Trunc)]
end.
ackmode_to_requeue(reject_requeue_false) -> false;
ackmode_to_requeue(reject_requeue_true) -> true.
parse_ackmode(ack_requeue_false) -> true;
parse_ackmode(ack_requeue_true) -> false;
parse_ackmode(reject_requeue_false) -> false;
parse_ackmode(reject_requeue_true) -> false.
% the messages must rejects later,
% because we get always the same message if the
% messages are requeued inside basic_get/5
maybe_rejects(R, Ch, AckMode) ->
lists:foreach(fun(X) ->
maybe_reject(Ch, AckMode,
proplists:get_value(delivery_tag, X))
end, R).
% removes the delivery_tag from the reply.
% it is not necessary
remove_delivery_tag([]) -> [];
remove_delivery_tag([H|T]) ->
[proplists:delete(delivery_tag, H) | [X || X <- remove_delivery_tag(T)]].
maybe_reject(Ch, AckMode, DeliveryTag) when AckMode == reject_requeue_true;
AckMode == reject_requeue_false ->
amqp_channel:call(Ch,
#'basic.reject'{delivery_tag = DeliveryTag,
requeue = ackmode_to_requeue(AckMode)});
maybe_reject(_Ch, _AckMode, _DeliveryTag) -> ok.
basic_get(Ch, Q, AckMode, Enc, Trunc) ->
case amqp_channel:call(Ch,
#'basic.get'{queue = Q,
no_ack = parse_ackmode(AckMode)}) of
{#'basic.get_ok'{redelivered = Redelivered,
exchange = Exchange,
routing_key = RoutingKey,
message_count = MessageCount,
delivery_tag = DeliveryTag},
#amqp_msg{props = Props, payload = Payload}} ->
[{payload_bytes, size(Payload)},
{redelivered, Redelivered},
{exchange, Exchange},
{routing_key, RoutingKey},
{message_count, MessageCount},
{delivery_tag, DeliveryTag},
{properties, rabbit_mgmt_format:basic_properties(Props)}] ++
payload_part(maybe_truncate(Payload, Trunc), Enc);
#'basic.get_empty'{} ->
none
end.
is_authorized(ReqData, Context) ->
rabbit_mgmt_util:is_authorized_vhost(ReqData, Context).
%%--------------------------------------------------------------------
maybe_truncate(Payload, none) -> Payload;
maybe_truncate(Payload, Len) when size(Payload) < Len -> Payload;
maybe_truncate(Payload, Len) ->
<<Start:Len/binary, _Rest/binary>> = Payload,
Start.
payload_part(Payload, Enc) ->
{PL, E} = case Enc of
auto -> case is_utf8(Payload) of
true -> {Payload, string};
false -> {base64:encode(Payload), base64}
end;
_ -> {base64:encode(Payload), base64}
end,
[{payload, PL}, {payload_encoding, E}].
is_utf8(<<>>) -> true;
is_utf8(<<_/utf8, Rest/bits>>) -> is_utf8(Rest);
is_utf8(_) -> false.
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