mirror of
https://github.com/processone/ejabberd.git
synced 2024-11-24 16:23:40 +01:00
206 lines
7.9 KiB
Erlang
206 lines
7.9 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_batch.erl
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%%% Author : Paweł Chmielowski <pawel@process-one.net>
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%%% Purpose : Batch tasks manager
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%%% Created : 8 mar 2022 by Paweł Chmielowski <pawel@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2024 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 along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%----------------------------------------------------------------------
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-module(ejabberd_batch).
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-author("pawel@process-one.net").
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-behaviour(gen_server).
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-include("logger.hrl").
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%% API
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-export([start_link/0]).
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%% gen_server callbacks
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2,
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code_change/3]).
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-export([register_task/5, task_status/1, abort_task/1]).
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-define(SERVER, ?MODULE).
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-record(state, {tasks = #{}}).
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-record(task, {state = not_started, pid, steps, done_steps}).
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%%%===================================================================
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%%% API
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%%%===================================================================
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%% @doc Spawns the server and registers the local name (unique)
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-spec(start_link() ->
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{ok, Pid :: pid()} | ignore | {error, Reason :: term()}).
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start_link() ->
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gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
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register_task(Type, Steps, Rate, JobState, JobFun) ->
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gen_server:call(?MODULE, {register_task, Type, Steps, Rate, JobState, JobFun}).
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task_status(Type) ->
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gen_server:call(?MODULE, {task_status, Type}).
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abort_task(Type) ->
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gen_server:call(?MODULE, {abort_task, Type}).
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%%%===================================================================
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%%% gen_server callbacks
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%%%===================================================================
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%% @private
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%% @doc Initializes the server
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-spec(init(Args :: term()) ->
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{ok, State :: #state{}} | {ok, State :: #state{}, timeout() | hibernate} |
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{stop, Reason :: term()} | ignore).
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init([]) ->
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{ok, #state{}}.
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%% @private
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%% @doc Handling call messages
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-spec(handle_call(Request :: term(), From :: {pid(), Tag :: term()},
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State :: #state{}) ->
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{reply, Reply :: term(), NewState :: #state{}} |
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{reply, Reply :: term(), NewState :: #state{}, timeout() | hibernate} |
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{noreply, NewState :: #state{}} |
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{noreply, NewState :: #state{}, timeout() | hibernate} |
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{stop, Reason :: term(), Reply :: term(), NewState :: #state{}} |
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{stop, Reason :: term(), NewState :: #state{}}).
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handle_call({register_task, Type, Steps, Rate, JobState, JobFun}, _From, #state{tasks = Tasks} = State) ->
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case maps:get(Type, Tasks, #task{}) of
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#task{state = S} when S == completed; S == not_started; S == aborted; S == failed ->
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Pid = spawn(fun() -> work_loop(Type, JobState, JobFun, Rate, erlang:monotonic_time(second), 0) end),
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Tasks2 = maps:put(Type, #task{state = working, pid = Pid, steps = Steps, done_steps = 0}, Tasks),
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{reply, ok, #state{tasks = Tasks2}};
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#task{state = working} ->
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{reply, {error, in_progress}, State}
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end;
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handle_call({task_status, Type}, _From, #state{tasks = Tasks} = State) ->
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case maps:get(Type, Tasks, none) of
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none ->
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{reply, not_started, State};
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#task{state = not_started} ->
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{reply, not_started, State};
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#task{state = failed, done_steps = Steps, pid = Error} ->
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{reply, {failed, Steps, Error}, State};
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#task{state = aborted, done_steps = Steps} ->
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{reply, {aborted, Steps}, State};
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#task{state = working, done_steps = Steps} ->
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{reply, {working, Steps}, State};
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#task{state = completed, done_steps = Steps} ->
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{reply, {completed, Steps}, State}
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end;
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handle_call({abort_task, Type}, _From, #state{tasks = Tasks} = State) ->
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case maps:get(Type, Tasks, none) of
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#task{state = working, pid = Pid} = T ->
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Pid ! abort,
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Tasks2 = maps:put(Type, T#task{state = aborted, pid = none}, Tasks),
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{reply, aborted, State#state{tasks = Tasks2}};
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_ ->
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{reply, not_started, State}
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end;
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handle_call(_Request, _From, State = #state{}) ->
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{reply, ok, State}.
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%% @private
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%% @doc Handling cast messages
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-spec(handle_cast(Request :: term(), State :: #state{}) ->
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{noreply, NewState :: #state{}} |
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{noreply, NewState :: #state{}, timeout() | hibernate} |
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{stop, Reason :: term(), NewState :: #state{}}).
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handle_cast({task_finished, Type, Pid}, #state{tasks = Tasks} = State) ->
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case maps:get(Type, Tasks, none) of
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#task{state = working, pid = Pid2} = T when Pid == Pid2 ->
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Tasks2 = maps:put(Type, T#task{state = completed, pid = none}, Tasks),
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{noreply, State#state{tasks = Tasks2}};
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_ ->
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{noreply, State}
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end;
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handle_cast({task_progress, Type, Pid, Count}, #state{tasks = Tasks} = State) ->
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case maps:get(Type, Tasks, none) of
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#task{state = working, pid = Pid2, done_steps = Steps} = T when Pid == Pid2 ->
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Tasks2 = maps:put(Type, T#task{done_steps = Steps + Count}, Tasks),
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{noreply, State#state{tasks = Tasks2}};
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_ ->
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{noreply, State}
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end;
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handle_cast({task_error, Type, Pid, Error}, #state{tasks = Tasks} = State) ->
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case maps:get(Type, Tasks, none) of
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#task{state = working, pid = Pid2} = T when Pid == Pid2 ->
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Tasks2 = maps:put(Type, T#task{state = failed, pid = Error}, Tasks),
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{noreply, State#state{tasks = Tasks2}};
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_ ->
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{noreply, State}
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end;
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handle_cast(_Request, State = #state{}) ->
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{noreply, State}.
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%% @private
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%% @doc Handling all non call/cast messages
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-spec(handle_info(Info :: timeout() | term(), State :: #state{}) ->
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{noreply, NewState :: #state{}} |
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{noreply, NewState :: #state{}, timeout() | hibernate} |
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{stop, Reason :: term(), NewState :: #state{}}).
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handle_info(_Info, State = #state{}) ->
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{noreply, State}.
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%% @private
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%% @doc 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
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%% necessary cleaning up. When it returns, the gen_server terminates
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%% with Reason. The return value is ignored.
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-spec(terminate(Reason :: (normal | shutdown | {shutdown, term()} | term()),
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State :: #state{}) -> term()).
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terminate(_Reason, _State = #state{}) ->
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ok.
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%% @private
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%% @doc Convert process state when code is changed
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-spec(code_change(OldVsn :: term() | {down, term()}, State :: #state{},
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Extra :: term()) ->
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{ok, NewState :: #state{}} | {error, Reason :: term()}).
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code_change(_OldVsn, State = #state{}, _Extra) ->
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{ok, State}.
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%%%===================================================================
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%%% Internal functions
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%%%===================================================================
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work_loop(Task, JobState, JobFun, Rate, StartDate, CurrentProgress) ->
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try JobFun(JobState) of
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{ok, _NewState, 0} ->
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gen_server:cast(?MODULE, {task_finished, Task, self()});
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{ok, NewState, Count} ->
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gen_server:cast(?MODULE, {task_progress, Task, self(), Count}),
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NewProgress = CurrentProgress + Count,
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TimeSpent = erlang:monotonic_time(second) - StartDate,
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SleepTime = max(0, NewProgress/Rate*60 - TimeSpent),
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receive
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abort -> ok
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after round(SleepTime*1000) ->
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work_loop(Task, NewState, JobFun, Rate, StartDate, NewProgress)
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end;
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{error, Error} ->
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gen_server:cast(?MODULE, {task_error, Task, self(), Error})
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catch _:_ ->
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gen_server:cast(?MODULE, {task_error, Task, self(), internal_error})
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end.
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