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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) 2019-2020 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(rabbit_boot_state).
-include_lib("eunit/include/eunit.hrl").
-export([get/0,
set/1,
wait_for/2]).
-define(PT_KEY_BOOT_STATE, {?MODULE, boot_state}).
-type boot_state() :: 'stopped' | 'booting' | 'ready' | 'stopping'.
-export_type([boot_state/0]).
-spec get() -> boot_state().
get() ->
persistent_term:get(?PT_KEY_BOOT_STATE, stopped).
-spec set(boot_state()) -> ok.
set(BootState) ->
rabbit_log_prelaunch:debug("Change boot state to `~s`", [BootState]),
?assert(is_valid(BootState)),
case BootState of
stopped -> persistent_term:erase(?PT_KEY_BOOT_STATE);
_ -> persistent_term:put(?PT_KEY_BOOT_STATE, BootState)
end,
rabbit_boot_state_sup:notify_boot_state_listeners(BootState).
-spec wait_for(boot_state(), timeout()) -> ok | {error, timeout}.
wait_for(BootState, infinity) ->
case is_reached(BootState) of
true -> ok;
false -> Wait = 200,
timer:sleep(Wait),
wait_for(BootState, infinity)
end;
wait_for(BootState, Timeout)
when is_integer(Timeout) andalso Timeout >= 0 ->
case is_reached(BootState) of
true -> ok;
false -> Wait = 200,
timer:sleep(Wait),
wait_for(BootState, Timeout - Wait)
end;
wait_for(_, _) ->
{error, timeout}.
boot_state_idx(stopped) -> 0;
boot_state_idx(booting) -> 1;
boot_state_idx(ready) -> 2;
boot_state_idx(stopping) -> 3.
is_valid(BootState) ->
is_integer(boot_state_idx(BootState)).
is_reached(TargetBootState) ->
is_reached(?MODULE:get(), TargetBootState).
is_reached(CurrentBootState, CurrentBootState) ->
true;
is_reached(stopping, stopped) ->
false;
is_reached(_CurrentBootState, stopped) ->
true;
is_reached(stopped, _TargetBootState) ->
true;
is_reached(CurrentBootState, TargetBootState) ->
boot_state_idx(TargetBootState) =< boot_state_idx(CurrentBootState).
|
