/
rabbit_basic.erl
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/
rabbit_basic.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 VMware, Inc.
%% Copyright (c) 2007-2011 VMware, Inc. All rights reserved.
%%
-module(rabbit_basic).
-include("rabbit.hrl").
-include("rabbit_framing.hrl").
-export([publish/1, message/3, message/4, properties/1, delivery/5]).
-export([publish/4, publish/7]).
-export([build_content/2, from_content/1]).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-type(properties_input() ::
(rabbit_framing:amqp_property_record() | [{atom(), any()}])).
-type(publish_result() ::
({ok, rabbit_router:routing_result(), [pid()]}
| rabbit_types:error('not_found'))).
-type(exchange_input() :: (rabbit_types:exchange() | rabbit_exchange:name())).
-type(body_input() :: (binary() | [binary()])).
-spec(publish/1 ::
(rabbit_types:delivery()) -> publish_result()).
-spec(delivery/5 ::
(boolean(), boolean(), rabbit_types:maybe(rabbit_types:txn()),
rabbit_types:message(), undefined | integer()) ->
rabbit_types:delivery()).
-spec(message/4 ::
(rabbit_exchange:name(), rabbit_router:routing_key(),
properties_input(), binary()) -> rabbit_types:message()).
-spec(message/3 ::
(rabbit_exchange:name(), rabbit_router:routing_key(),
rabbit_types:decoded_content()) ->
rabbit_types:ok_or_error2(rabbit_types:message(), any())).
-spec(properties/1 ::
(properties_input()) -> rabbit_framing:amqp_property_record()).
-spec(publish/4 ::
(exchange_input(), rabbit_router:routing_key(), properties_input(),
body_input()) -> publish_result()).
-spec(publish/7 ::
(exchange_input(), rabbit_router:routing_key(), boolean(), boolean(),
rabbit_types:maybe(rabbit_types:txn()), properties_input(),
body_input()) -> publish_result()).
-spec(build_content/2 :: (rabbit_framing:amqp_property_record(),
binary() | [binary()]) -> rabbit_types:content()).
-spec(from_content/1 :: (rabbit_types:content()) ->
{rabbit_framing:amqp_property_record(), binary()}).
-endif.
%%----------------------------------------------------------------------------
publish(Delivery = #delivery{
message = #basic_message{exchange_name = ExchangeName}}) ->
case rabbit_exchange:lookup(ExchangeName) of
{ok, X} -> publish(X, Delivery);
Other -> Other
end.
delivery(Mandatory, Immediate, Txn, Message, MsgSeqNo) ->
#delivery{mandatory = Mandatory, immediate = Immediate, txn = Txn,
sender = self(), message = Message, msg_seq_no = MsgSeqNo}.
build_content(Properties, BodyBin) when is_binary(BodyBin) ->
build_content(Properties, [BodyBin]);
build_content(Properties, PFR) ->
%% basic.publish hasn't changed so we can just hard-code amqp_0_9_1
{ClassId, _MethodId} =
rabbit_framing_amqp_0_9_1:method_id('basic.publish'),
#content{class_id = ClassId,
properties = Properties,
properties_bin = none,
protocol = none,
payload_fragments_rev = PFR}.
from_content(Content) ->
#content{class_id = ClassId,
properties = Props,
payload_fragments_rev = FragmentsRev} =
rabbit_binary_parser:ensure_content_decoded(Content),
%% basic.publish hasn't changed so we can just hard-code amqp_0_9_1
{ClassId, _MethodId} =
rabbit_framing_amqp_0_9_1:method_id('basic.publish'),
{Props, list_to_binary(lists:reverse(FragmentsRev))}.
%% This breaks the spec rule forbidding message modification
strip_header(#content{properties = #'P_basic'{headers = undefined}}
= DecodedContent, _Key) ->
DecodedContent;
strip_header(#content{properties = Props = #'P_basic'{headers = Headers}}
= DecodedContent, Key) ->
case lists:keysearch(Key, 1, Headers) of
false -> DecodedContent;
{value, Found} -> Headers0 = lists:delete(Found, Headers),
rabbit_binary_generator:clear_encoded_content(
DecodedContent#content{
properties = Props#'P_basic'{
headers = Headers0}})
end.
message(ExchangeName, RoutingKey,
#content{properties = Props} = DecodedContent) ->
try
{ok, #basic_message{
exchange_name = ExchangeName,
content = strip_header(DecodedContent, ?DELETED_HEADER),
id = rabbit_guid:guid(),
is_persistent = is_message_persistent(DecodedContent),
routing_keys = [RoutingKey |
header_routes(Props#'P_basic'.headers)]}}
catch
{error, _Reason} = Error -> Error
end.
message(ExchangeName, RoutingKey, RawProperties, Body) ->
Properties = properties(RawProperties),
Content = build_content(Properties, Body),
{ok, Msg} = message(ExchangeName, RoutingKey, Content),
Msg.
properties(P = #'P_basic'{}) ->
P;
properties(P) when is_list(P) ->
%% Yes, this is O(length(P) * record_info(size, 'P_basic') / 2),
%% i.e. slow. Use the definition of 'P_basic' directly if
%% possible!
lists:foldl(fun ({Key, Value}, Acc) ->
case indexof(record_info(fields, 'P_basic'), Key) of
0 -> throw({unknown_basic_property, Key});
N -> setelement(N + 1, Acc, Value)
end
end, #'P_basic'{}, P).
indexof(L, Element) -> indexof(L, Element, 1).
indexof([], _Element, _N) -> 0;
indexof([Element | _Rest], Element, N) -> N;
indexof([_ | Rest], Element, N) -> indexof(Rest, Element, N + 1).
%% Convenience function, for avoiding round-trips in calls across the
%% erlang distributed network.
publish(Exchange, RoutingKeyBin, Properties, Body) ->
publish(Exchange, RoutingKeyBin, false, false, none, Properties,
Body).
%% Convenience function, for avoiding round-trips in calls across the
%% erlang distributed network.
publish(X = #exchange{name = XName}, RKey, Mandatory, Immediate, Txn,
Props, Body) ->
publish(X, delivery(Mandatory, Immediate, Txn,
message(XName, RKey, properties(Props), Body),
undefined));
publish(XName, RKey, Mandatory, Immediate, Txn, Props, Body) ->
case rabbit_exchange:lookup(XName) of
{ok, X} -> publish(X, RKey, Mandatory, Immediate, Txn, Props, Body);
Err -> Err
end.
publish(X, Delivery) ->
{RoutingRes, DeliveredQPids} = rabbit_exchange:publish(X, Delivery),
{ok, RoutingRes, DeliveredQPids}.
is_message_persistent(#content{properties = #'P_basic'{
delivery_mode = Mode}}) ->
case Mode of
1 -> false;
2 -> true;
undefined -> false;
Other -> throw({error, {delivery_mode_unknown, Other}})
end.
%% Extract CC routes from headers
header_routes(undefined) ->
[];
header_routes(HeadersTable) ->
lists:append(
[case rabbit_misc:table_lookup(HeadersTable, HeaderKey) of
{array, Routes} -> [Route || {longstr, Route} <- Routes];
undefined -> [];
{Type, _Val} -> throw({error, {unacceptable_type_in_header,
Type,
binary_to_list(HeaderKey)}})
end || HeaderKey <- ?ROUTING_HEADERS]).