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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").
-record(trace_state, {trace_exchange}).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-type(state() :: #trace_state{trace_exchange :: rabbit_exchange:name()}).
-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) ->
#trace_state{trace_exchange = trace_exchange(VHost)}.
tap_trace_in(Msg, #trace_state{trace_exchange = TraceX}) ->
maybe_trace(Msg, TraceX, <<"publish">>, xname(Msg), []).
tap_trace_out({#resource{name = QName}, _QPid, _QMsgId, Redelivered, Msg},
#trace_state{trace_exchange = TraceX}) ->
RedeliveredNum = case Redelivered of true -> 1; false -> 0 end,
maybe_trace(Msg, TraceX, <<"deliver">>, QName,
[{<<"redelivered">>, signedint, RedeliveredNum}]).
xname(#basic_message{exchange_name = #resource{name = XName}}) -> XName.
vhost(#basic_message{exchange_name = #resource{virtual_host = VHost}}) -> VHost.
maybe_trace(Msg, TraceX, RKPrefix, RKSuffix, Extra) ->
XName = xname(Msg),
case TraceX of
none -> ok;
XName -> ok;
_ -> case catch trace(TraceX, Msg, RKPrefix, RKSuffix, Extra) of
{'EXIT', R} -> rabbit_log:info("Trace died: ~p~n", [R]);
ok -> ok
end
end.
trace_exchange(VHost) ->
case application:get_env(rabbit, trace_exchanges) of
undefined -> none;
{ok, Xs} -> proplists:get_value(VHost, Xs, none)
end.
trace(TraceX, Msg0, RKPrefix, RKSuffix, Extra) ->
Msg = ensure_content_decoded(Msg0),
rabbit_basic:publish(rabbit_misc:r(vhost(Msg), exchange, TraceX),
<<RKPrefix/binary, ".", RKSuffix/binary>>,
#'P_basic'{headers = msg_to_table(Msg) ++ Extra},
payload(Msg)),
ok.
msg_to_table(#basic_message{exchange_name = #resource{name = XName},
routing_keys = RoutingKeys,
content = #content{properties = Props}}) ->
{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())}].
payload(#basic_message{content = #content{payload_fragments_rev = PFR}}) ->
list_to_binary(lists:reverse(PFR)).
ensure_content_decoded(Msg = #basic_message{content = Content}) ->
Msg#basic_message{content = rabbit_binary_parser:ensure_content_decoded(
Content)}.
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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