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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([init/1, tap_trace_in/2, tap_trace_out/2]).
-include("rabbit.hrl").
-include("rabbit_framing.hrl").
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-type(state() :: rabbit_exchange:name() | 'none').
-spec(init/1 :: (rabbit_types:vhost()) -> state()).
-spec(tap_trace_in/2 :: (rabbit_types:basic_message(), state()) -> 'ok').
-spec(tap_trace_out/2 :: (rabbit_amqqueue:qmsg(), state()) -> 'ok').
-endif.
%%----------------------------------------------------------------------------
init(VHost) ->
case application:get_env(rabbit, trace_exchanges) of
undefined -> none;
{ok, XNs} -> case proplists:get_value(VHost, XNs, none) of
none -> none;
Name -> rabbit_misc:r(VHost, exchange, Name)
end
end.
tap_trace_in(Msg = #basic_message{exchange_name = #resource{name = XName}},
TraceXN) ->
maybe_trace(TraceXN, Msg, <<"publish">>, XName, []).
tap_trace_out({#resource{name = QName}, _QPid, _QMsgId, Redelivered, Msg},
TraceXN) ->
RedeliveredNum = case Redelivered of true -> 1; false -> 0 end,
maybe_trace(TraceXN, Msg, <<"deliver">>, QName,
[{<<"redelivered">>, signedint, RedeliveredNum}]).
maybe_trace(none, _Msg, _RKPrefix, _RKSuffix, _Extra) ->
ok;
maybe_trace(XName, #basic_message{exchange_name = #resource{name = XName}},
_RKPrefix, _RKSuffix, _Extra) ->
ok;
maybe_trace(XName, Msg = #basic_message{content = #content{
payload_fragments_rev = PFR}},
RKPrefix, RKSuffix, Extra) ->
case rabbit_basic:publish(XName,
<<RKPrefix/binary, ".", RKSuffix/binary>>,
#'P_basic'{headers = msg_to_table(Msg) ++ Extra},
list_to_binary(lists:reverse(PFR))) of
{ok, _, _} -> ok;
{error, not_found} -> rabbit_log:info("trace ~s not found~n",
[rabbit_misc:rs(XName)])
end.
msg_to_table(#basic_message{exchange_name = #resource{name = XName},
routing_keys = RoutingKeys,
content = Content}) ->
#content{properties = Props} =
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())}].
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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