%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2002-2018. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(etop_tr).
-author('[email protected]').
%%-compile(export_all).
-export([setup_tracer/1,stop_tracer/1,reader/1]).
-import(etop,[getopt/2]).
-include("etop_defs.hrl").
setup_tracer(Config) ->
TraceNode = getopt(node,Config),
RHost = rpc:call(TraceNode, net_adm, localhost, []),
Store = ets:new(?MODULE, [set, public]),
%% We can only trace one process anyway kill the old one.
case erlang:whereis(dbg) of
undefined ->
case rpc:call(TraceNode, erlang, whereis, [dbg]) of
undefined -> fine;
Pid ->
exit(Pid, kill)
end;
Pid ->
exit(Pid,kill)
end,
dbg:tracer(TraceNode,port,dbg:trace_port(ip,{getopt(port,Config),5000})),
dbg:p(all,[running,timestamp]),
T = dbg:get_tracer(TraceNode),
Config#opts{tracer=T,host=RHost,store=Store}.
stop_tracer(_Config) ->
dbg:p(all,clear),
dbg:stop(),
ok.
reader(Config) ->
Host = getopt(host, Config),
Port = getopt(port, Config),
{ok, Sock} = gen_tcp:connect(Host, Port, [{active, false}]),
spawn_link(fun() -> reader_init(Sock,getopt(store,Config),[]) end).
%%%%%%%%%%%%%% Socket reader %%%%%%%%%%%%%%%%%%%%%%%%%%%
reader_init(Sock, Store, Last) ->
process_flag(priority, high),
reader(Sock, Store, Last).
reader(Sock, Store, Last) ->
Data = get_data(Sock),
New = handle_data(Last, Data, Store),
reader(Sock, Store, New).
handle_data(Last, {_, Pid, in, _, Time}, _) ->
[{Pid,Time}|Last];
handle_data([], {_, _, out, _, _}, _Store) ->
%% ignore - there was probably just a 'drop'
[];
handle_data(Last, {_, Pid, out, _, Time2} = G, Store) ->
case lists:keytake(Pid, 1, Last) of
{_, {_, Time1}, New} ->
Elapsed = elapsed(Time1, Time2),
case ets:member(Store,Pid) of
true -> ets:update_counter(Store, Pid, Elapsed);
false -> ets:insert(Store,{Pid,Elapsed})
end,
New;
false ->
io:format("Erlang top got garbage ~tp~n", [G]),
Last
end;
handle_data(_W, {drop, D}, _) -> %% Error case we are missing data here!
io:format("Erlang top dropped data ~p~n", [D]),
[];
handle_data(Last, G, _) ->
io:format("Erlang top got garbage ~tp~n", [G]),
Last.
elapsed({Me1, S1, Mi1}, {Me2, S2, Mi2}) ->
Me = (Me2 - Me1) * 1000000,
S = (S2 - S1 + Me) * 1000000,
Mi2 - Mi1 + S.
%%%%%% Socket helpers %%%%
get_data(Sock) ->
[Op | BESiz] = my_ip_read(Sock, 5),
Siz = get_be(BESiz),
case Op of
0 ->
B = list_to_binary(my_ip_read(Sock, Siz)),
binary_to_term(B);
1 ->
{drop, Siz};
Else ->
exit({'bad trace tag', Else})
end.
get_be([A,B,C,D]) ->
A * 16777216 + B * 65536 + C * 256 + D.
my_ip_read(Sock,N) ->
case gen_tcp:recv(Sock, N) of
{ok, Data} ->
case length(Data) of
N ->
Data;
X ->
Data ++ my_ip_read(Sock, N - X)
end;
_Else ->
exit(eof)
end.
