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ts_os_mon_munin.erl
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ts_os_mon_munin.erl
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%%%
%%% Copyright 2008 © Nicolas Niclausse
%%%
%%% Author : Nicolas Niclausse <nicolas.nniclausse@niclux.org>
%%% Created: 21 oct 2008 by Nicolas Niclausse <nicolas.niclausse@niclux.org>
%%%
%%% This program is free software; you can redistribute it and/or modify
%%% it under the terms of the GNU General Public License as published by
%%% the Free Software Foundation; either version 2 of the License, or
%%% (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
%%% GNU General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License
%%% along with this program; if not, write to the Free Software
%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
%%%
%%% In addition, as a special exception, you have the permission to
%%% link the code of this program with any library released under
%%% the EPL license and distribute linked combinations including
%%% the two; the MPL (Mozilla Public License), which EPL (Erlang
%%% Public License) is based on, is included in this exception.
-module(ts_os_mon_munin).
-vc('$Id: ts_os_mon_snmp.erl,v 0.0 2008/10/21 12:57:49 nniclaus Exp $ ').
-author('nicolas.niclausse@niclux.org').
-behaviour(gen_server).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%% @doc munin plugin for ts_os_mon
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-include("ts_macros.hrl").
-include("ts_os_mon.hrl").
-define(READ_TIMEOUT,2500). % 2.5 sec
-define(SEND_TIMEOUT,5000).
-define(RETRY_SLEEP,30000).
%% if interval is more than this, we must send ping to avoid closed
%% connection from munin node server (default timeout is 10s in recent
%% version of munin-node):
-define(MAX_INTERVAL,8000).
-define(PING_INTERVAL,5000).
-export([start/1]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-record(state,{
mon, % pid of mon server
interval, % interval in msec between gathering of data
socket, % tcp socket
port, % tcp port of munin-node server
host, % remote munin-node hostname
addr, % remote munin-node IP addr
ncpus % number of cpus of remote server
}).
start(Args) ->
?LOGF("starting os_mon_munin with args ~p",[Args],?NOTICE),
gen_server:start_link(?MODULE, Args, []).
%%--------------------------------------------------------------------
%% Function: init/1
%% Description: Initiates the server
%% Returns: {ok, State} |
%% {ok, State, Timeout} |
%% ignore |
%% {stop, Reason}
%%--------------------------------------------------------------------
init({HostStr, {Port}, Interval, MonServer}) ->
?LOGF("Starting munin mgr on ~p:~p~n", [HostStr,Port], ?DEB),
{ok, IP} = inet:getaddr(HostStr, inet),
erlang:start_timer(?INIT_WAIT, self(), connect ),
{ok, #state{mon=MonServer, host=HostStr, interval=Interval, addr=IP, port=Port}}.
%%--------------------------------------------------------------------
%% Function: handle_call/3
%% Description: Handling call messages
%% Returns: {reply, Reply, State} |
%% {reply, Reply, State, Timeout} |
%% {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, Reply, State} | (terminate/2 is called)
%% {stop, Reason, State} (terminate/2 is called)
%%--------------------------------------------------------------------
handle_call(_Request, _From, State) ->
Reply = ok,
{reply, Reply, State}.
%%--------------------------------------------------------------------
%% Function: handle_cast/2
%% Description: Handling cast messages
%% Returns: {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State} (terminate/2 is called)
%%--------------------------------------------------------------------
handle_cast(Msg, State) ->
{stop, {unknown_message, Msg}, State}.
%%--------------------------------------------------------------------
%% Function: handle_info/2
%% Description: Handling all non call/cast messages
%% Returns: {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State} (terminate/2 is called)
%%--------------------------------------------------------------------
handle_info({timeout,_Ref,connect},State=#state{addr=IP,port=Port,host=HostStr}) ->
Opts=[list,
{active, false},
{packet, line},
{send_timeout, ?SEND_TIMEOUT},
{keepalive, true}
],
case gen_tcp:connect(IP, Port, Opts) of
{ok, Socket} ->
case gen_tcp:recv(Socket,0, ?READ_TIMEOUT) of
{ok, "# munin node at "++ Str} ->
MuninHost = ts_utils:chop(Str),
?LOGF("Connected to ~p~n", [MuninHost], ?INFO),
%% We want CPU value ranging from 0 to 100, so we need the max value :
gen_tcp:send(Socket,"config cpu\n"),
ConfigCPU=read_munin_data(Socket),
NCPUs = case proplists:get_value('user.max',ConfigCPU) of
Num when is_number(Num) ->
Num/100 ;
_ ->
?LOG("can't find the number of CPU, assume one~n",?NOTICE),
1
end,
?LOGF("first fetch succesful to ~p~n", [MuninHost], ?INFO),
case (State#state.interval > ?MAX_INTERVAL) of
true ->
erlang:start_timer(?PING_INTERVAL, self(), ping );
_ ->
ok
end,
erlang:start_timer(State#state.interval, self(), send_request ),
{noreply, State#state{socket=Socket,host=MuninHost,ncpus=NCPUs}};
{error, Reason} ->
?LOGF("Error while connecting to munin server: ~p~n", [Reason], ?ERR),
{stop, Reason, State}
end;
{error, Reason} ->
?LOGF("Can't connect to munin server on ~p, reason:~p~n", [HostStr, Reason], ?ERR),
{stop, Reason, State}
end;
handle_info({timeout, _Ref, ping}, State=#state{socket=Socket} ) ->
gen_tcp:send(Socket,"\n"),
gen_tcp:recv(Socket,0,?READ_TIMEOUT),
erlang:start_timer(?PING_INTERVAL, self(), ping ),
{noreply, State};
handle_info({timeout, _Ref, send_request}, State=#state{socket=Socket,host=Hostname} ) ->
%% Currenly, fetch only cpu and memory
%% FIXME: should be customizable in XML config file
?LOGF("Fetching munin for cpu on host ~p~n", [Hostname], ?DEB),
gen_tcp:send(Socket,"fetch cpu\n"),
AllCPU=read_munin_data(Socket),
?LOGF("Fetching munin for memory on host ~p~n", [Hostname], ?DEB),
gen_tcp:send(Socket,"fetch memory\n"),
AllMem=read_munin_data(Socket),
?LOGF("Fetching munin for load on host ~p~n", [Hostname], ?DEB),
gen_tcp:send(Socket,"fetch load\n"),
AllLoad=read_munin_data(Socket),
%% sum all cpu types, except idle.
NonIdle=lists:keydelete('idle.value',1,AllCPU),
RawCpu = lists:foldl(fun({_Key,Val},Acc) when is_integer(Val)->
Acc+Val
end,0,NonIdle) / (State#state.interval div 1000),
Cpu=check_value(RawCpu,{Hostname,"cpu"})/State#state.ncpus,
?LOGF(" munin cpu on host ~p is ~p~n", [Hostname,Cpu], ?DEB),
%% returns free + buffer + cache
FunFree = fun({Key,Val},Acc) when ((Key=='buffers.value') or
(Key=='free.value') or
(Key=='cached.value') ) ->
Acc+Val;
(_, Acc) -> Acc
end,
FreeMem=check_value(lists:foldl(FunFree,0,AllMem),{Hostname,"memory"})/1048576,%MBytes
?LOGF(" munin memory on host ~p is ~p~n", [Hostname,FreeMem], ?DEB),
%% load only has one value at present
Load = lists:foldl(fun({_Key,Val},Acc) -> Acc+Val end,0,AllLoad),
?LOGF(" munin load on host ~p is ~p~n", [Hostname,Load], ?DEB),
ts_os_mon:send(State#state.mon,[{sample_counter, {cpu, Hostname}, Cpu},
{sample, {freemem, Hostname}, FreeMem},
{sample, {load, Hostname}, Load}]),
erlang:start_timer(State#state.interval, self(), send_request ),
{noreply, State}.
%%--------------------------------------------------------------------
%% Function: terminate/2
%% Description: Shutdown the server
%% Returns: any (ignored by gen_server)
%%--------------------------------------------------------------------
terminate(_Reason, #state{socket=undefined}) ->
ok;
terminate(_Reason, #state{socket=Socket}) ->
gen_tcp:close(Socket).
%%--------------------------------------------------------------------
%% Func: code_change/3
%% Purpose: Convert process state when code is changed
%% Returns: {ok, NewState}
%%--------------------------------------------------------------------
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%%----------------------------------------------------------------------
%%% Internal functions
%%%----------------------------------------------------------------------
read_munin_data(Socket)->
read_munin_data(Socket,gen_tcp:recv(Socket,0,?READ_TIMEOUT),[]).
read_munin_data(_Socket,{ok,".\n"}, Acc)->
Acc;
read_munin_data(Socket,{ok, "graph_args --base "++ Data}, Acc) when is_list(Acc)->
%% special case for getting the number of cpus
NewAcc = case re:run(Data,"--upper-limit (\\d+)",[{capture,all_but_first,list}]) of
{match,[Val]} when length(Val) > 0 ->
?LOGF("the munin node has ~p CPUs ~n",[Val],?INFO),
[{'user.max',list_to_integer(Val)}| Acc];
_ ->
?LOGF("upper-limit don't match ~p~n",[Data],?WARN),
Acc
end,
read_munin_data(Socket,gen_tcp:recv(Socket,0,?READ_TIMEOUT), NewAcc);
read_munin_data(Socket,{ok, Data}, Acc) when is_list(Acc)->
?DebugF("Parse munin data: ~p~n",[Data]),
NewAcc = case string:tokens(Data," \n") of
[Key, Value] ->
try ts_utils:list_to_number(Value) of
Num when is_number(Num) ->
[{list_to_atom(Key), Num }|Acc]
catch
_Type:_Exp ->
Acc
end;
[_Key| _Rest] ->
Acc;
_ ->
?LOGF("Unknown data received from munin server: ~p~n",[Data],?WARN),
Acc
end,
read_munin_data(Socket,gen_tcp:recv(Socket,0,?READ_TIMEOUT), NewAcc);
read_munin_data(Socket,{error, timeout}, Acc) when is_list(Acc)->
%% the remote server may be overloaded, wait a bit before retrying
?LOG("munin: timeout error, server must be overloaded, sleep for 30 sec~n", ?WARN),
gen_tcp:close(Socket),
timer:sleep(?RETRY_SLEEP),
erlang:error(server_timeout).
%% check is this a valid value (positive at least)
check_value(Val,_) when Val > 0 -> Val;
check_value(Val,{Host, Type}) ->
?LOGF("munin: bad ~s value on host ~p: ~p~n", [Type, Host, Val],?WARN),
0.