mirror of
https://github.com/processone/ejabberd.git
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336 lines
12 KiB
Erlang
336 lines
12 KiB
Erlang
%%%-------------------------------------------------------------------
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%%% File : ejabberd_system_monitor.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Description : Ejabberd watchdog
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%%% Created : 21 Mar 2007 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2014 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License
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%%% along with this program; if not, write to the Free Software
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%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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%%% 02111-1307 USA
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%%%
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%%%-------------------------------------------------------------------
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-module(ejabberd_system_monitor).
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-author('alexey@process-one.net').
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-behaviour(gen_server).
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%% API
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-export([start_link/0, process_command/3,
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process_remote_command/1]).
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%% gen_server callbacks
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-export([init/1, handle_call/3, handle_cast/2,
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handle_info/2, terminate/2, code_change/3]).
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-include("ejabberd.hrl").
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-include("logger.hrl").
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-include("jlib.hrl").
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-record(state, {}).
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%%====================================================================
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%% API
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%%====================================================================
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%%--------------------------------------------------------------------
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%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
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%% Description: Starts the server
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%%--------------------------------------------------------------------
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start_link() ->
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LH = ejabberd_config:get_option(
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watchdog_large_heap,
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fun(I) when is_integer(I), I > 0 -> I end,
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1000000),
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Opts = [{large_heap, LH}],
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gen_server:start_link({local, ?MODULE}, ?MODULE, Opts,
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[]).
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process_command(From, To, Packet) ->
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case To of
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#jid{luser = <<"">>, lresource = <<"watchdog">>} ->
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#xmlel{name = Name} = Packet,
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case Name of
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<<"message">> ->
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LFrom =
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jlib:jid_tolower(jlib:jid_remove_resource(From)),
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case lists:member(LFrom, get_admin_jids()) of
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true ->
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Body = xml:get_path_s(Packet,
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[{elem, <<"body">>}, cdata]),
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spawn(fun () ->
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process_flag(priority, high),
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process_command1(From, To, Body)
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end),
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stop;
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false -> ok
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end;
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_ -> ok
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end;
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_ -> ok
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end.
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%%====================================================================
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%% gen_server callbacks
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%%====================================================================
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%%--------------------------------------------------------------------
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%% Function: init(Args) -> {ok, State} |
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%% {ok, State, Timeout} |
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%% ignore |
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%% {stop, Reason}
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%% Description: Initiates the server
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%%--------------------------------------------------------------------
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init(Opts) ->
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LH = proplists:get_value(large_heap, Opts),
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process_flag(priority, high),
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erlang:system_monitor(self(), [{large_heap, LH}]),
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lists:foreach(fun (Host) ->
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ejabberd_hooks:add(local_send_to_resource_hook, Host,
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?MODULE, process_command, 50)
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end,
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?MYHOSTS),
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{ok, #state{}}.
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%%--------------------------------------------------------------------
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%% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} |
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%% {reply, Reply, State, Timeout} |
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%% {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, Reply, State} |
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%% {stop, Reason, State}
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%% Description: Handling call messages
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%%--------------------------------------------------------------------
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handle_call({get, large_heap}, _From, State) ->
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{reply, get_large_heap(), State};
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handle_call({set, large_heap, NewValue}, _From,
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State) ->
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MonSettings = erlang:system_monitor(self(),
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[{large_heap, NewValue}]),
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OldLH = get_large_heap(MonSettings),
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NewLH = get_large_heap(),
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{reply, {lh_changed, OldLH, NewLH}, State};
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handle_call(_Request, _From, State) ->
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Reply = ok, {reply, Reply, State}.
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get_large_heap() ->
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MonSettings = erlang:system_monitor(),
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get_large_heap(MonSettings).
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get_large_heap(MonSettings) ->
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{_MonitorPid, Options} = MonSettings,
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proplists:get_value(large_heap, Options).
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%%--------------------------------------------------------------------
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%% Function: handle_cast(Msg, State) -> {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, State}
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%% Description: Handling cast messages
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%%--------------------------------------------------------------------
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handle_cast(_Msg, State) -> {noreply, State}.
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%%--------------------------------------------------------------------
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%% Function: handle_info(Info, State) -> {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, State}
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%% Description: Handling all non call/cast messages
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%%--------------------------------------------------------------------
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handle_info({monitor, Pid, large_heap, Info}, State) ->
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spawn(fun () ->
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process_flag(priority, high),
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process_large_heap(Pid, Info)
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end),
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{noreply, State};
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handle_info(_Info, State) -> {noreply, State}.
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%%--------------------------------------------------------------------
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%% Function: terminate(Reason, State) -> void()
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%% Description: This function is called by a gen_server when it is about to
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%% terminate. It should be the opposite of Module:init/1 and do any necessary
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%% cleaning up. When it returns, the gen_server terminates with Reason.
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%% The return value is ignored.
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%%--------------------------------------------------------------------
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terminate(_Reason, _State) -> ok.
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%%--------------------------------------------------------------------
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%% Func: code_change(OldVsn, State, Extra) -> {ok, NewState}
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%% Description: Convert process state when code is changed
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%%--------------------------------------------------------------------
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code_change(_OldVsn, State, _Extra) -> {ok, State}.
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%%--------------------------------------------------------------------
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%%% Internal functions
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%%--------------------------------------------------------------------
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process_large_heap(Pid, Info) ->
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Host = (?MYNAME),
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JIDs = get_admin_jids(),
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DetailedInfo = detailed_info(Pid),
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Body = iolist_to_binary(
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io_lib:format("(~w) The process ~w is consuming too "
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"much memory:~n~p~n~s",
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[node(), Pid, Info, DetailedInfo])),
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From = jlib:make_jid(<<"">>, Host, <<"watchdog">>),
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lists:foreach(fun (JID) ->
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send_message(From, jlib:make_jid(JID), Body)
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end, JIDs).
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send_message(From, To, Body) ->
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ejabberd_router:route(From, To,
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#xmlel{name = <<"message">>,
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attrs = [{<<"type">>, <<"chat">>}],
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children =
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[#xmlel{name = <<"body">>, attrs = [],
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children =
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[{xmlcdata, Body}]}]}).
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get_admin_jids() ->
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ejabberd_config:get_option(
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watchdog_admins,
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fun(JIDs) ->
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[jlib:jid_tolower(
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jlib:string_to_jid(
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iolist_to_binary(S))) || S <- JIDs]
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end, []).
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detailed_info(Pid) ->
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case process_info(Pid, dictionary) of
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{dictionary, Dict} ->
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case lists:keysearch('$ancestors', 1, Dict) of
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{value, {'$ancestors', [Sup | _]}} ->
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case Sup of
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ejabberd_c2s_sup -> c2s_info(Pid);
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ejabberd_s2s_out_sup -> s2s_out_info(Pid);
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ejabberd_service_sup -> service_info(Pid);
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_ -> detailed_info1(Pid)
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end;
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_ -> detailed_info1(Pid)
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end;
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_ -> detailed_info1(Pid)
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end.
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detailed_info1(Pid) ->
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io_lib:format("~p",
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[[process_info(Pid, current_function),
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process_info(Pid, initial_call),
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process_info(Pid, message_queue_len),
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process_info(Pid, links), process_info(Pid, dictionary),
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process_info(Pid, heap_size),
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process_info(Pid, stack_size)]]).
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c2s_info(Pid) ->
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[<<"Process type: c2s">>, check_send_queue(Pid),
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<<"\n">>,
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io_lib:format("Command to kill this process: kill ~s ~w",
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[iolist_to_binary(atom_to_list(node())), Pid])].
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s2s_out_info(Pid) ->
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FromTo = mnesia:dirty_select(s2s,
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[{{s2s, '$1', Pid, '_'}, [], ['$1']}]),
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[<<"Process type: s2s_out">>,
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case FromTo of
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[{From, To}] ->
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<<"\n",
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(io_lib:format("S2S connection: from ~s to ~s",
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[From, To]))/binary>>;
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_ -> <<"">>
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end,
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check_send_queue(Pid), <<"\n">>,
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io_lib:format("Command to kill this process: kill ~s ~w",
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[iolist_to_binary(atom_to_list(node())), Pid])].
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service_info(Pid) ->
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Routes = mnesia:dirty_select(route,
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[{{route, '$1', Pid, '_'}, [], ['$1']}]),
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[<<"Process type: s2s_out">>,
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case Routes of
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[Route] -> <<"\nServiced domain: ", Route/binary>>;
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_ -> <<"">>
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end,
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check_send_queue(Pid), <<"\n">>,
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io_lib:format("Command to kill this process: kill ~s ~w",
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[iolist_to_binary(atom_to_list(node())), Pid])].
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check_send_queue(Pid) ->
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case {process_info(Pid, current_function),
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process_info(Pid, message_queue_len)}
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of
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{{current_function, MFA}, {message_queue_len, MLen}} ->
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if MLen > 100 ->
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case MFA of
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{prim_inet, send, 2} ->
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<<"\nPossible reason: the process is blocked "
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"trying to send data over its TCP connection.">>;
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{M, F, A} ->
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[<<"\nPossible reason: the process can't "
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"process messages faster than they arrive. ">>,
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io_lib:format("Current function is ~w:~w/~w",
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[M, F, A])]
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end;
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true -> <<"">>
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end;
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_ -> <<"">>
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end.
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process_command1(From, To, Body) ->
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process_command2(str:tokens(Body, <<" ">>), From, To).
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process_command2([<<"kill">>, SNode, SPid], From, To) ->
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Node = jlib:binary_to_atom(SNode),
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remote_command(Node, [kill, SPid], From, To);
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process_command2([<<"showlh">>, SNode], From, To) ->
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Node = jlib:binary_to_atom(SNode),
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remote_command(Node, [showlh], From, To);
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process_command2([<<"setlh">>, SNode, NewValueString],
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From, To) ->
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Node = jlib:binary_to_atom(SNode),
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NewValue = jlib:binary_to_integer(NewValueString),
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remote_command(Node, [setlh, NewValue], From, To);
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process_command2([<<"help">>], From, To) ->
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send_message(To, From, help());
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process_command2(_, From, To) ->
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send_message(To, From, help()).
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help() ->
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<<"Commands:\n kill <node> <pid>\n showlh "
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"<node>\n setlh <node> <integer>">>.
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remote_command(Node, Args, From, To) ->
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Message = case rpc:call(Node, ?MODULE,
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process_remote_command, [Args])
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of
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{badrpc, Reason} ->
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io_lib:format("Command failed:~n~p", [Reason]);
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Result -> Result
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end,
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send_message(To, From, iolist_to_binary(Message)).
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process_remote_command([kill, SPid]) ->
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exit(list_to_pid(SPid), kill), <<"ok">>;
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process_remote_command([showlh]) ->
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Res = gen_server:call(ejabberd_system_monitor,
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{get, large_heap}),
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io_lib:format("Current large heap: ~p", [Res]);
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process_remote_command([setlh, NewValue]) ->
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{lh_changed, OldLH, NewLH} =
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gen_server:call(ejabberd_system_monitor,
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{set, large_heap, NewValue}),
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io_lib:format("Result of set large heap: ~p --> ~p",
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[OldLH, NewLH]);
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process_remote_command(_) -> throw(unknown_command).
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