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rabbit_disk_monitor.erl
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rabbit_disk_monitor.erl
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%% This Source Code Form is subject to the terms of the Mozilla Public
%% License, v. 2.0. If a copy of the MPL was not distributed with this
%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
%%
%% Copyright (c) 2007-2021 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(rabbit_disk_monitor).
%% Disk monitoring server. Monitors free disk space
%% periodically and sets alarms when it is below a certain
%% watermark (configurable either as an absolute value or
%% relative to the memory limit).
%%
%% Disk monitoring is done by shelling out to /usr/bin/df
%% instead of related built-in OTP functions because currently
%% this is the most reliable way of determining free disk space
%% for the partition our internal database is on.
%%
%% Update interval is dynamically calculated assuming disk
%% space is being filled at FAST_RATE.
-behaviour(gen_server).
-export([start_link/1]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-export([get_disk_free_limit/0, set_disk_free_limit/1,
get_min_check_interval/0, set_min_check_interval/1,
get_max_check_interval/0, set_max_check_interval/1,
get_disk_free/0, set_enabled/1]).
-define(SERVER, ?MODULE).
-define(DEFAULT_MIN_DISK_CHECK_INTERVAL, 100).
-define(DEFAULT_MAX_DISK_CHECK_INTERVAL, 10000).
-define(DEFAULT_DISK_FREE_LIMIT, 50000000).
%% 250MB/s i.e. 250kB/ms
-define(FAST_RATE, (250 * 1000)).
-record(state, {
%% monitor partition on which this directory resides
dir,
%% configured limit in bytes
limit,
%% last known free disk space amount in bytes
actual,
%% minimum check interval
min_interval,
%% maximum check interval
max_interval,
%% timer that drives periodic checks
timer,
%% is free disk space alarm currently in effect?
alarmed,
%% is monitoring enabled? false on unsupported
%% platforms
enabled,
%% number of retries to enable monitoring if it fails
%% on start-up
retries,
%% Interval between retries
interval
}).
%%----------------------------------------------------------------------------
-type disk_free_limit() :: integer() | {'absolute', integer()} | string() | {'mem_relative', float() | integer()}.
%%----------------------------------------------------------------------------
%% Public API
%%----------------------------------------------------------------------------
-spec get_disk_free_limit() -> integer().
get_disk_free_limit() ->
gen_server:call(?MODULE, get_disk_free_limit).
-spec set_disk_free_limit(disk_free_limit()) -> 'ok'.
set_disk_free_limit(Limit) ->
gen_server:call(?MODULE, {set_disk_free_limit, Limit}).
-spec get_min_check_interval() -> integer().
get_min_check_interval() ->
gen_server:call(?MODULE, get_min_check_interval).
-spec set_min_check_interval(integer()) -> 'ok'.
set_min_check_interval(Interval) ->
gen_server:call(?MODULE, {set_min_check_interval, Interval}).
-spec get_max_check_interval() -> integer().
get_max_check_interval() ->
gen_server:call(?MODULE, get_max_check_interval).
-spec set_max_check_interval(integer()) -> 'ok'.
set_max_check_interval(Interval) ->
gen_server:call(?MODULE, {set_max_check_interval, Interval}).
-spec get_disk_free() -> (integer() | 'unknown').
get_disk_free() ->
gen_server:call(?MODULE, get_disk_free).
-spec set_enabled(string()) -> 'ok'.
set_enabled(Enabled) ->
gen_server:call(?MODULE, {set_enabled, Enabled}).
%%----------------------------------------------------------------------------
%% gen_server callbacks
%%----------------------------------------------------------------------------
-spec start_link(disk_free_limit()) -> rabbit_types:ok_pid_or_error().
start_link(Args) ->
gen_server:start_link({local, ?SERVER}, ?MODULE, [Args], []).
init([Limit]) ->
Dir = dir(),
{ok, Retries} = application:get_env(rabbit, disk_monitor_failure_retries),
{ok, Interval} = application:get_env(rabbit, disk_monitor_failure_retry_interval),
State = #state{dir = Dir,
min_interval = ?DEFAULT_MIN_DISK_CHECK_INTERVAL,
max_interval = ?DEFAULT_MAX_DISK_CHECK_INTERVAL,
alarmed = false,
enabled = true,
limit = Limit,
retries = Retries,
interval = Interval},
{ok, enable(State)}.
handle_call(get_disk_free_limit, _From, State = #state{limit = Limit}) ->
{reply, Limit, State};
handle_call({set_disk_free_limit, _}, _From, #state{enabled = false} = State) ->
rabbit_log:info("Cannot set disk free limit: "
"disabled disk free space monitoring", []),
{reply, ok, State};
handle_call({set_disk_free_limit, Limit}, _From, State) ->
{reply, ok, set_disk_limits(State, Limit)};
handle_call(get_min_check_interval, _From, State) ->
{reply, State#state.min_interval, State};
handle_call(get_max_check_interval, _From, State) ->
{reply, State#state.max_interval, State};
handle_call({set_min_check_interval, MinInterval}, _From, State) ->
{reply, ok, State#state{min_interval = MinInterval}};
handle_call({set_max_check_interval, MaxInterval}, _From, State) ->
{reply, ok, State#state{max_interval = MaxInterval}};
handle_call(get_disk_free, _From, State = #state { actual = Actual }) ->
{reply, Actual, State};
handle_call({set_enabled, _Enabled = true}, _From, State) ->
start_timer(set_disk_limits(State, State#state.limit)),
rabbit_log:info("Free disk space monitor was enabled"),
{reply, ok, State#state{enabled = true}};
handle_call({set_enabled, _Enabled = false}, _From, State) ->
erlang:cancel_timer(State#state.timer),
rabbit_log:info("Free disk space monitor was manually disabled"),
{reply, ok, State#state{enabled = false}};
handle_call(_Request, _From, State) ->
{noreply, State}.
handle_cast(_Request, State) ->
{noreply, State}.
handle_info(try_enable, #state{retries = Retries} = State) ->
{noreply, enable(State#state{retries = Retries - 1})};
handle_info(update, State) ->
{noreply, start_timer(internal_update(State))};
handle_info(_Info, State) ->
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%----------------------------------------------------------------------------
%% Server Internals
%%----------------------------------------------------------------------------
% the partition / drive containing this directory will be monitored
dir() -> rabbit_mnesia:dir().
set_disk_limits(State, Limit0) ->
Limit = interpret_limit(Limit0),
State1 = State#state { limit = Limit },
rabbit_log:info("Disk free limit set to ~pMB",
[trunc(Limit / 1000000)]),
internal_update(State1).
internal_update(State = #state { limit = Limit,
dir = Dir,
alarmed = Alarmed}) ->
CurrentFree = get_disk_free(Dir),
NewAlarmed = CurrentFree < Limit,
case {Alarmed, NewAlarmed} of
{false, true} ->
emit_update_info("insufficient", CurrentFree, Limit),
rabbit_alarm:set_alarm({{resource_limit, disk, node()}, []});
{true, false} ->
emit_update_info("sufficient", CurrentFree, Limit),
rabbit_alarm:clear_alarm({resource_limit, disk, node()});
_ ->
ok
end,
State #state {alarmed = NewAlarmed, actual = CurrentFree}.
get_disk_free(Dir) ->
get_disk_free(Dir, os:type()).
get_disk_free(Dir, {unix, Sun})
when Sun =:= sunos; Sun =:= sunos4; Sun =:= solaris ->
Df = os:find_executable("df"),
parse_free_unix(run_cmd(Df ++ " -k " ++ Dir));
get_disk_free(Dir, {unix, _}) ->
Df = os:find_executable("df"),
parse_free_unix(run_cmd(Df ++ " -kP " ++ Dir));
get_disk_free(Dir, {win32, _}) ->
case win32_get_disk_free_fsutil(Dir) of
{ok, Free0} -> Free0;
error ->
case win32_get_disk_free_pwsh(Dir) of
{ok, Free1} -> Free1;
_ -> exit(could_not_determine_disk_free)
end
end.
parse_free_unix(Str) ->
case string:tokens(Str, "\n") of
[_, S | _] -> case string:tokens(S, " \t") of
[_, _, _, Free | _] -> list_to_integer(Free) * 1024;
_ -> exit({unparseable, Str})
end;
_ -> exit({unparseable, Str})
end.
win32_get_disk_free_fsutil(Dir) ->
% Dir:
% "c:/Users/username/AppData/Roaming/RabbitMQ/db/rabbit2@username-z01-mnesia"
Drive = string:slice(Dir, 0, 2),
% Drive: c:
FsutilCmd = "fsutil.exe volume diskfree " ++ Drive,
% C:\windows\system32>fsutil volume diskfree c:
% Total free bytes : 812,733,878,272 (756.9 GB)
% Total bytes : 1,013,310,287,872 (943.7 GB)
% Total quota free bytes : 812,733,878,272 (756.9 GB)
case run_cmd(FsutilCmd) of
{error, timeout} ->
error;
FsutilResult ->
case string:slice(FsutilResult, 0, 5) of
"Error" ->
error;
"Total" ->
FirstLine = hd(string:tokens(FsutilResult, "\r\n")),
{match, [FreeStr]} = re:run(FirstLine, "(\\d+,?)+", [{capture, first, list}]),
{ok, list_to_integer(lists:flatten(string:tokens(FreeStr, ",")))}
end
end.
win32_get_disk_free_pwsh(Dir) ->
% Dir:
% "c:/Users/username/AppData/Roaming/RabbitMQ/db/rabbit2@username-z01-mnesia"
Drive = string:slice(Dir, 0, 1),
PoshCmd = "powershell.exe -NoLogo -NoProfile -NonInteractive -Command (Get-PSDrive " ++ Drive ++ ").Free",
case run_cmd(PoshCmd) of
{error, timeout} ->
error;
PoshResultStr ->
% Note: remove \r\n
PoshResult = string:slice(PoshResultStr, 0, length(PoshResultStr) - 2),
{ok, list_to_integer(PoshResult)}
end.
interpret_limit({mem_relative, Relative})
when is_number(Relative) ->
round(Relative * vm_memory_monitor:get_total_memory());
interpret_limit({absolute, Absolute}) ->
interpret_limit(Absolute);
interpret_limit(Absolute) ->
case rabbit_resource_monitor_misc:parse_information_unit(Absolute) of
{ok, ParsedAbsolute} -> ParsedAbsolute;
{error, parse_error} ->
rabbit_log:error("Unable to parse disk_free_limit value ~p",
[Absolute]),
?DEFAULT_DISK_FREE_LIMIT
end.
emit_update_info(StateStr, CurrentFree, Limit) ->
rabbit_log:info(
"Free disk space is ~s. Free bytes: ~p. Limit: ~p",
[StateStr, CurrentFree, Limit]).
start_timer(State) ->
State#state{timer = erlang:send_after(interval(State), self(), update)}.
interval(#state{alarmed = true,
max_interval = MaxInterval}) ->
MaxInterval;
interval(#state{limit = Limit,
actual = Actual,
min_interval = MinInterval,
max_interval = MaxInterval}) ->
IdealInterval = 2 * (Actual - Limit) / ?FAST_RATE,
trunc(erlang:max(MinInterval, erlang:min(MaxInterval, IdealInterval))).
enable(#state{retries = 0} = State) ->
State;
enable(#state{dir = Dir, interval = Interval, limit = Limit, retries = Retries}
= State) ->
case {catch get_disk_free(Dir),
vm_memory_monitor:get_total_memory()} of
{N1, N2} when is_integer(N1), is_integer(N2) ->
rabbit_log:info("Enabling free disk space monitoring", []),
start_timer(set_disk_limits(State, Limit));
Err ->
rabbit_log:info("Free disk space monitor encountered an error "
"(e.g. failed to parse output from OS tools): ~p, retries left: ~b",
[Err, Retries]),
erlang:send_after(Interval, self(), try_enable),
State#state{enabled = false}
end.
run_cmd(Cmd) ->
Pid = self(),
Ref = make_ref(),
CmdFun = fun() ->
CmdResult = rabbit_misc:os_cmd(Cmd),
Pid ! {Pid, Ref, CmdResult}
end,
CmdPid = spawn(CmdFun),
receive
{Pid, Ref, CmdResult} ->
CmdResult
after 5000 ->
exit(CmdPid, kill),
rabbit_log:error("Command timed out: '~s'", [Cmd]),
{error, timeout}
end.