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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_trace).
-export([tap_trace_in/1, tap_trace_out/1]).
-include("rabbit.hrl").
-include("rabbit_framing.hrl").
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-spec(tap_trace_in/1 :: (rabbit_types:basic_message()) -> 'ok').
-spec(tap_trace_out/1 :: (rabbit_amqqueue:qmsg()) -> 'ok').
-endif.
%%----------------------------------------------------------------------------
tap_trace_in(Message = #basic_message{
exchange_name = #resource{virtual_host = VHost,
name = XName}}) ->
check_trace(
XName, VHost,
fun (TraceExchange) ->
{EncodedMetadata, Payload} = message_to_table(Message),
publish(TraceExchange, VHost, <<"publish">>, XName,
EncodedMetadata, Payload)
end).
tap_trace_out({#resource{name = QName}, _QPid, _QMsgId, Redelivered,
Message = #basic_message{
exchange_name = #resource{virtual_host = VHost,
name = XName}}}) ->
check_trace(
XName, VHost,
fun (TraceExchange) ->
RedeliveredNum = case Redelivered of true -> 1; false -> 0 end,
{EncodedMetadata, Payload} = message_to_table(Message),
Fields = [{<<"redelivered">>, signedint, RedeliveredNum}]
++ EncodedMetadata,
publish(TraceExchange, VHost, <<"deliver">>, QName,
Fields, Payload)
end).
check_trace(XName, VHost, F) ->
case application:get_env(rabbit, {trace_exchange, VHost}) of
undefined -> ok;
{ok, XName} -> ok;
{ok, TraceX} -> case catch F(TraceX) of
{'EXIT', R} -> rabbit_log:info(
"Trace tap died: ~p~n", [R]);
ok -> ok
end
end.
publish(TraceExchange, VHost, RKPrefix, RKSuffix, Table, Payload) ->
rabbit_basic:publish(rabbit_misc:r(VHost, exchange, TraceExchange),
<<RKPrefix/binary, ".", RKSuffix/binary>>,
#'P_basic'{headers = Table}, Payload),
ok.
message_to_table(#basic_message{exchange_name = #resource{name = XName},
routing_keys = RoutingKeys,
content = Content}) ->
#content{properties = Props,
payload_fragments_rev = PFR} =
rabbit_binary_parser:ensure_content_decoded(Content),
{PropsTable, _Ix} =
lists:foldl(
fun (K, {L, Ix}) ->
V = element(Ix, Props),
NewL = case V of
undefined -> L;
_ -> [{a2b(K), type(V), V} | L]
end,
{NewL, Ix + 1}
end, {[], 2}, record_info(fields, 'P_basic')),
{[{<<"exchange_name">>, longstr, XName},
{<<"routing_keys">>, array, [{longstr, K} || K <- RoutingKeys]},
{<<"properties">>, table, PropsTable},
{<<"node">>, longstr, a2b(node())}],
list_to_binary(lists:reverse(PFR))}.
a2b(A) ->
list_to_binary(atom_to_list(A)).
type(V) when is_list(V) -> table;
type(V) when is_integer(V) -> signedint;
type(_V) -> longstr.
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