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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 GoPivotal, Inc.
%% Copyright (c) 2007-2013 GoPivotal, Inc. All rights reserved.
%%
-module(rabbit_trace).
-export([init/1, enabled/1, tap_in/2, tap_out/2, start/1, stop/1]).
-include("rabbit.hrl").
-include("rabbit_framing.hrl").
-define(TRACE_VHOSTS, trace_vhosts).
-define(XNAME, <<"amq.rabbitmq.trace">>).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-type(state() :: rabbit_types:exchange() | 'none').
-spec(init/1 :: (rabbit_types:vhost()) -> state()).
-spec(enabled/1 :: (rabbit_types:vhost()) -> boolean()).
-spec(tap_in/2 :: (rabbit_types:basic_message(), state()) -> 'ok').
-spec(tap_out/2 :: (rabbit_amqqueue:qmsg(), state()) -> 'ok').
-spec(start/1 :: (rabbit_types:vhost()) -> 'ok').
-spec(stop/1 :: (rabbit_types:vhost()) -> 'ok').
-endif.
%%----------------------------------------------------------------------------
init(VHost) ->
case enabled(VHost) of
false -> none;
true -> {ok, X} = rabbit_exchange:lookup(
rabbit_misc:r(VHost, exchange, ?XNAME)),
X
end.
enabled(VHost) ->
{ok, VHosts} = application:get_env(rabbit, ?TRACE_VHOSTS),
lists:member(VHost, VHosts).
tap_in(_Msg, none) -> ok;
tap_in(Msg = #basic_message{exchange_name = #resource{name = XName}}, TraceX) ->
trace(TraceX, Msg, <<"publish">>, XName, []).
tap_out(_Msg, none) -> ok;
tap_out({#resource{name = QName}, _QPid, _QMsgId, Redelivered, Msg}, TraceX) ->
RedeliveredNum = case Redelivered of true -> 1; false -> 0 end,
trace(TraceX, Msg, <<"deliver">>, QName,
[{<<"redelivered">>, signedint, RedeliveredNum}]).
%%----------------------------------------------------------------------------
start(VHost) ->
rabbit_log:info("Enabling tracing for vhost '~s'~n", [VHost]),
update_config(fun (VHosts) -> [VHost | VHosts -- [VHost]] end).
stop(VHost) ->
rabbit_log:info("Disabling tracing for vhost '~s'~n", [VHost]),
update_config(fun (VHosts) -> VHosts -- [VHost] end).
update_config(Fun) ->
{ok, VHosts0} = application:get_env(rabbit, ?TRACE_VHOSTS),
VHosts = Fun(VHosts0),
application:set_env(rabbit, ?TRACE_VHOSTS, VHosts),
rabbit_channel:refresh_config_local(),
ok.
%%----------------------------------------------------------------------------
trace(#exchange{name = Name}, #basic_message{exchange_name = Name},
_RKPrefix, _RKSuffix, _Extra) ->
ok;
trace(X, Msg = #basic_message{content = #content{payload_fragments_rev = PFR}},
RKPrefix, RKSuffix, Extra) ->
{ok, _, _} = rabbit_basic:publish(
X, <<RKPrefix/binary, ".", RKSuffix/binary>>,
#'P_basic'{headers = msg_to_table(Msg) ++ Extra}, PFR),
ok.
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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