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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_amqp1_0_outgoing_link).
-export([attach/3, delivery/6, transferred/3, credit_drained/3, flow/3]).
-include_lib("amqp_client/include/amqp_client.hrl").
-include("rabbit_amqp1_0.hrl").
-import(rabbit_amqp1_0_util, [protocol_error/3, serial_add/2]).
-import(rabbit_amqp1_0_link_util, [handle_to_ctag/1]).
-define(INIT_TXFR_COUNT, 0).
-define(DEFAULT_SEND_SETTLED, false).
-record(outgoing_link, {queue,
delivery_count = 0,
send_settled,
default_outcome,
route_state}).
attach(#'v1_0.attach'{name = Name,
handle = Handle,
source = Source,
snd_settle_mode = SndSettleMode,
rcv_settle_mode = RcvSettleMode}, BCh, DCh) ->
{DefaultOutcome, Outcomes} = rabbit_amqp1_0_link_util:outcomes(Source),
SndSettled =
case SndSettleMode of
?V_1_0_SENDER_SETTLE_MODE_SETTLED -> true;
?V_1_0_SENDER_SETTLE_MODE_UNSETTLED -> false;
_ -> ?DEFAULT_SEND_SETTLED
end,
DOSym = amqp10_framing:symbol_for(DefaultOutcome),
case ensure_source(Source,
#outgoing_link{delivery_count = ?INIT_TXFR_COUNT,
send_settled = SndSettled,
default_outcome = DOSym,
route_state =
rabbit_routing_util:init_state()},
DCh) of
{ok, Source1, OutgoingLink = #outgoing_link{queue = QueueName}} ->
CTag = handle_to_ctag(Handle),
case rabbit_amqp1_0_channel:subscribe(
BCh, #'basic.consume'{
queue = QueueName,
consumer_tag = CTag,
%% we will ack when we've transferred
%% a message, or when we get an ack
%% from the client.
no_ack = false,
%% TODO exclusive?
exclusive = false,
arguments = [{<<"x-credit">>, table,
[{<<"credit">>, long, 0},
{<<"drain">>, bool, false}]}]},
self()) of
#'basic.consume_ok'{} ->
%% TODO we should avoid the race by getting the queue to send
%% attach back, but a.t.m. it would use the wrong codec.
{ok, [#'v1_0.attach'{
name = Name,
handle = Handle,
initial_delivery_count = {uint, ?INIT_TXFR_COUNT},
snd_settle_mode =
case SndSettled of
true -> ?V_1_0_SENDER_SETTLE_MODE_SETTLED;
false -> ?V_1_0_SENDER_SETTLE_MODE_UNSETTLED
end,
rcv_settle_mode = RcvSettleMode,
source = Source1#'v1_0.source'{
default_outcome = DefaultOutcome,
outcomes = Outcomes
},
role = ?SEND_ROLE}], OutgoingLink};
Fail ->
protocol_error(?V_1_0_AMQP_ERROR_INTERNAL_ERROR,
"Consume failed: ~p", [Fail])
end;
{error, Reason} ->
%% TODO proper link establishment protocol here?
protocol_error(?V_1_0_AMQP_ERROR_INVALID_FIELD,
"Attach rejected: ~p", [Reason])
end.
credit_drained(#'basic.credit_drained'{credit_drained = CreditDrained},
Handle, Link = #outgoing_link{delivery_count = Count0}) ->
Count = Count0 + CreditDrained,
%% The transfer count that is given by the queue should be at
%% least that we have locally, since we will either have received
%% all the deliveries and transferred them, or the queue will have
%% advanced it due to drain. So we adopt the queue's idea of the
%% count.
%% TODO account for it not being there any more
F = #'v1_0.flow'{ handle = Handle,
delivery_count = {uint, Count},
link_credit = {uint, 0},
available = {uint, 0},
drain = true },
{F, Link#outgoing_link{delivery_count = Count}}.
flow(#outgoing_link{delivery_count = LocalCount},
#'v1_0.flow'{handle = Handle,
delivery_count = Count0,
link_credit = {uint, RemoteCredit},
drain = Drain0}, BCh) ->
{uint, RemoteCount} = default(Count0, {uint, LocalCount}),
Drain = default(Drain0, false),
%% See section 2.6.7
LocalCredit = RemoteCount + RemoteCredit - LocalCount,
CTag = handle_to_ctag(Handle),
#'basic.credit_ok'{available = Available} =
rabbit_amqp1_0_channel:call(
BCh, #'basic.credit'{consumer_tag = CTag,
credit = LocalCredit,
drain = Drain}),
case Available of
-1 ->
{ok, []};
%% We don't know - probably because this flow relates
%% to a handle that does not yet exist
%% TODO is this an error?
_ ->
{ok, [#'v1_0.flow'{
handle = Handle,
delivery_count = {uint, LocalCount},
link_credit = {uint, LocalCredit},
available = {uint, Available},
drain = Drain}]}
end.
default(undefined, Default) -> Default;
default(Thing, _Default) -> Thing.
ensure_source(Source = #'v1_0.source'{address = Address,
dynamic = Dynamic,
durable = Durable,
%% TODO
expiry_policy = _ExpiryPolicy,
%% TODO
timeout = _Timeout},
Link = #outgoing_link{ route_state = RouteState }, DCh) ->
DeclareParams = [{durable, rabbit_amqp1_0_link_util:durable(Durable)},
{exclusive, false},
{auto_delete, false},
{check_exchange, true},
{nowait, false}],
case Dynamic of
true -> protocol_error(?V_1_0_AMQP_ERROR_NOT_IMPLEMENTED,
"Dynamic sources not supported", []);
_ -> ok
end,
case Address of
{utf8, Destination} ->
case rabbit_routing_util:parse_endpoint(Destination, false) of
{ok, Dest} ->
{ok, Queue, RouteState1} =
rabbit_amqp1_0_channel:convert_error(
fun() ->
rabbit_routing_util:ensure_endpoint(
source, DCh, Dest, DeclareParams,
RouteState)
end),
ER = rabbit_routing_util:parse_routing(Dest),
ok = rabbit_routing_util:ensure_binding(Queue, ER, DCh),
{ok, Source, Link#outgoing_link{route_state = RouteState1,
queue = Queue}};
{error, _} = E ->
E
end;
_ ->
{error, {address_not_utf8_string, Address}}
end.
delivery(Deliver = #'basic.deliver'{delivery_tag = DeliveryTag,
routing_key = RKey},
Msg, FrameMax, Handle, Session,
#outgoing_link{send_settled = SendSettled,
default_outcome = DefaultOutcome}) ->
DeliveryId = rabbit_amqp1_0_session:next_delivery_id(Session),
Session1 = rabbit_amqp1_0_session:record_outgoing(
DeliveryTag, SendSettled, DefaultOutcome, Session),
Txfr = #'v1_0.transfer'{handle = Handle,
delivery_tag = {binary, <<DeliveryTag:64>>},
delivery_id = {uint, DeliveryId},
%% The only one in AMQP 1-0
message_format = {uint, 0},
settled = SendSettled,
resume = false,
more = false,
aborted = false,
%% TODO: actually batchable would be fine,
%% but in any case it's only a hint
batchable = false},
Msg1_0 = rabbit_amqp1_0_message:annotated_message(
RKey, Deliver, Msg),
?DEBUG("Outbound content:~n ~p",
[[amqp10_framing:pprint(Section) ||
Section <- amqp10_framing:decode_bin(
iolist_to_binary(Msg1_0))]]),
%% TODO Ugh
TLen = iolist_size(amqp10_framing:encode_bin(Txfr)),
Frames = case FrameMax of
unlimited ->
[[Txfr, Msg1_0]];
_ ->
encode_frames(Txfr, Msg1_0, FrameMax - TLen, [])
end,
{ok, Frames, Session1}.
encode_frames(_T, _Msg, MaxContentLen, _Transfers) when MaxContentLen =< 0 ->
protocol_error(?V_1_0_AMQP_ERROR_FRAME_SIZE_TOO_SMALL,
"Frame size is too small by ~p bytes", [-MaxContentLen]);
encode_frames(T, Msg, MaxContentLen, Transfers) ->
case iolist_size(Msg) > MaxContentLen of
true ->
<<Chunk:MaxContentLen/binary, Rest/binary>> =
iolist_to_binary(Msg),
T1 = T#'v1_0.transfer'{more = true},
encode_frames(T, Rest, MaxContentLen,
[[T1, Chunk] | Transfers]);
false ->
lists:reverse([[T, Msg] | Transfers])
end.
transferred(DeliveryTag, Channel,
Link = #outgoing_link{ delivery_count = Count,
send_settled = SendSettled }) ->
if SendSettled ->
rabbit_amqp1_0_channel:cast(
Channel, #'basic.ack'{ delivery_tag = DeliveryTag });
true ->
ok
end,
Link#outgoing_link{delivery_count = serial_add(Count, 1)}.
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