mirror of
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345 lines
11 KiB
Erlang
345 lines
11 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_hooks.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : Manage hooks
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%%% Created : 8 Aug 2004 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2010 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_hooks).
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-author('alexey@process-one.net').
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-behaviour(gen_server).
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%% External exports
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-export([start_link/0,
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add/3,
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add/4,
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add_dist/5,
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delete/3,
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delete/4,
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delete_dist/5,
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run/2,
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run_fold/3,
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add/5,
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add_dist/6,
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delete/5,
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delete_dist/6,
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run/3,
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run_fold/4]).
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%% gen_server callbacks
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-export([init/1,
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handle_call/3,
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handle_cast/2,
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code_change/3,
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handle_info/2,
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terminate/2]).
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-include("ejabberd.hrl").
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%% Timeout of 5 seconds in calls to distributed hooks
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-define(TIMEOUT_DISTRIBUTED_HOOK, 5000).
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-record(state, {}).
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%%%----------------------------------------------------------------------
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%%% API
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%%%----------------------------------------------------------------------
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start_link() ->
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gen_server:start_link({local, ejabberd_hooks}, ejabberd_hooks, [], []).
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%% @spec (Hook::atom(), Function::function(), Seq::integer()) -> ok
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%% @doc See add/4.
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add(Hook, Function, Seq) when is_function(Function) ->
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add(Hook, global, undefined, Function, Seq).
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add(Hook, Host, Function, Seq) when is_function(Function) ->
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add(Hook, Host, undefined, Function, Seq);
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%% @spec (Hook::atom(), Module::atom(), Function::atom(), Seq::integer()) -> ok
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%% @doc Add a module and function to this hook.
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%% The integer sequence is used to sort the calls: low number is called before high number.
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add(Hook, Module, Function, Seq) ->
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add(Hook, global, Module, Function, Seq).
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add(Hook, Host, Module, Function, Seq) ->
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gen_server:call(ejabberd_hooks, {add, Hook, Host, Module, Function, Seq}).
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add_dist(Hook, Node, Module, Function, Seq) ->
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gen_server:call(ejabberd_hooks, {add, Hook, global, Node, Module, Function, Seq}).
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add_dist(Hook, Host, Node, Module, Function, Seq) ->
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gen_server:call(ejabberd_hooks, {add, Hook, Host, Node, Module, Function, Seq}).
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%% @spec (Hook::atom(), Function::function(), Seq::integer()) -> ok
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%% @doc See del/4.
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delete(Hook, Function, Seq) when is_function(Function) ->
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delete(Hook, global, undefined, Function, Seq).
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delete(Hook, Host, Function, Seq) when is_function(Function) ->
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delete(Hook, Host, undefined, Function, Seq);
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%% @spec (Hook::atom(), Module::atom(), Function::atom(), Seq::integer()) -> ok
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%% @doc Delete a module and function from this hook.
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%% It is important to indicate exactly the same information than when the call was added.
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delete(Hook, Module, Function, Seq) ->
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delete(Hook, global, Module, Function, Seq).
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delete(Hook, Host, Module, Function, Seq) ->
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gen_server:call(ejabberd_hooks, {delete, Hook, Host, Module, Function, Seq}).
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delete_dist(Hook, Node, Module, Function, Seq) ->
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delete_dist(Hook, global, Node, Module, Function, Seq).
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delete_dist(Hook, Host, Node, Module, Function, Seq) ->
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gen_server:call(ejabberd_hooks, {delete, Hook, Host, Node, Module, Function, Seq}).
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%% @spec (Hook::atom(), Args) -> ok
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%% @doc Run the calls of this hook in order, don't care about function results.
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%% If a call returns stop, no more calls are performed.
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run(Hook, Args) ->
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run(Hook, global, Args).
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run(Hook, Host, Args) ->
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case ets:lookup(hooks, {Hook, Host}) of
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[{_, Ls}] ->
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run1(Ls, Hook, Args);
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[] ->
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ok
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end.
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%% @spec (Hook::atom(), Val, Args) -> Val | stopped | NewVal
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%% @doc Run the calls of this hook in order.
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%% The arguments passed to the function are: [Val | Args].
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%% The result of a call is used as Val for the next call.
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%% If a call returns 'stop', no more calls are performed and 'stopped' is returned.
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%% If a call returns {stopped, NewVal}, no more calls are performed and NewVal is returned.
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run_fold(Hook, Val, Args) ->
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run_fold(Hook, global, Val, Args).
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run_fold(Hook, Host, Val, Args) ->
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case ets:lookup(hooks, {Hook, Host}) of
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[{_, Ls}] ->
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run_fold1(Ls, Hook, Val, Args);
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[] ->
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Val
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end.
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%%%----------------------------------------------------------------------
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%%% Callback functions from gen_server
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%%%----------------------------------------------------------------------
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%%----------------------------------------------------------------------
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%% Func: init/1
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%% Returns: {ok, State} |
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%% {ok, State, Timeout} |
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%% ignore |
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%% {stop, Reason}
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%%----------------------------------------------------------------------
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init([]) ->
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ets:new(hooks, [named_table]),
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{ok, #state{}}.
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%%----------------------------------------------------------------------
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%% Func: handle_call/3
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%% Returns: {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} | (terminate/2 is called)
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%% {stop, Reason, State} (terminate/2 is called)
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%%----------------------------------------------------------------------
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handle_call({add, Hook, Host, Module, Function, Seq}, _From, State) ->
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Reply = case ets:lookup(hooks, {Hook, Host}) of
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[{_, Ls}] ->
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El = {Seq, Module, Function},
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case lists:member(El, Ls) of
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true ->
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ok;
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false ->
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NewLs = lists:merge(Ls, [El]),
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ets:insert(hooks, {{Hook, Host}, NewLs}),
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ok
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end;
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[] ->
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NewLs = [{Seq, Module, Function}],
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ets:insert(hooks, {{Hook, Host}, NewLs}),
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ok
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end,
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{reply, Reply, State};
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handle_call({add, Hook, Host, Node, Module, Function, Seq}, _From, State) ->
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Reply = case ets:lookup(hooks, {Hook, Host}) of
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[{_, Ls}] ->
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El = {Seq, Node, Module, Function},
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case lists:member(El, Ls) of
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true ->
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ok;
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false ->
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NewLs = lists:merge(Ls, [El]),
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ets:insert(hooks, {{Hook, Host}, NewLs}),
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ok
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end;
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[] ->
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NewLs = [{Seq, Node, Module, Function}],
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ets:insert(hooks, {{Hook, Host}, NewLs}),
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ok
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end,
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{reply, Reply, State};
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handle_call({delete, Hook, Host, Module, Function, Seq}, _From, State) ->
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Reply = case ets:lookup(hooks, {Hook, Host}) of
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[{_, Ls}] ->
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NewLs = lists:delete({Seq, Module, Function}, Ls),
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ets:insert(hooks, {{Hook, Host}, NewLs}),
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ok;
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[] ->
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ok
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end,
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{reply, Reply, State};
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handle_call({delete, Hook, Host, Node, Module, Function, Seq}, _From, State) ->
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Reply = case ets:lookup(hooks, {Hook, Host}) of
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[{_, Ls}] ->
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NewLs = lists:delete({Seq, Node, Module, Function}, Ls),
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ets:insert(hooks, {{Hook, Host}, NewLs}),
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ok;
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[] ->
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ok
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end,
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{reply, Reply, State};
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handle_call(_Request, _From, State) ->
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Reply = ok,
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{reply, Reply, State}.
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%%----------------------------------------------------------------------
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%% Func: handle_cast/2
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%% Returns: {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, State} (terminate/2 is called)
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%%----------------------------------------------------------------------
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handle_cast(_Msg, State) ->
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{noreply, State}.
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%%----------------------------------------------------------------------
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%% Func: handle_info/2
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%% Returns: {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, State} (terminate/2 is called)
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%%----------------------------------------------------------------------
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handle_info(_Info, State) ->
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{noreply, State}.
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%%----------------------------------------------------------------------
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%% Func: terminate/2
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%% Purpose: Shutdown the server
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%% Returns: any (ignored by gen_server)
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%%----------------------------------------------------------------------
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terminate(_Reason, _State) ->
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ok.
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code_change(_OldVsn, 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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run1([], _Hook, _Args) ->
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ok;
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run1([{_Seq, Node, Module, Function} | Ls], Hook, Args) ->
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case rpc:call(Node, Module, Function, Args, ?TIMEOUT_DISTRIBUTED_HOOK) of
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timeout ->
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?ERROR_MSG("Timeout on RPC to ~p~nrunning hook: ~p",
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[Node, {Hook, Args}]),
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run1(Ls, Hook, Args);
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{badrpc, Reason} ->
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?ERROR_MSG("Bad RPC error to ~p: ~p~nrunning hook: ~p",
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[Node, Reason, {Hook, Args}]),
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run1(Ls, Hook, Args);
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stop ->
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?INFO_MSG("~nThe process ~p in node ~p ran a hook in node ~p.~n"
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"Stop.", [self(), node(), Node]), % debug code
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ok;
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Res ->
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?INFO_MSG("~nThe process ~p in node ~p ran a hook in node ~p.~n"
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"The response is:~n~s", [self(), node(), Node, Res]), % debug code
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run1(Ls, Hook, Args)
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end;
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run1([{_Seq, Module, Function} | Ls], Hook, Args) ->
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Res = if is_function(Function) ->
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catch apply(Function, Args);
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true ->
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catch apply(Module, Function, Args)
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end,
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case Res of
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{'EXIT', Reason} ->
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?ERROR_MSG("~p~nrunning hook: ~p",
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[Reason, {Hook, Args}]),
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run1(Ls, Hook, Args);
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stop ->
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ok;
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_ ->
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run1(Ls, Hook, Args)
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end.
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run_fold1([], _Hook, Val, _Args) ->
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Val;
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run_fold1([{_Seq, Node, Module, Function} | Ls], Hook, Val, Args) ->
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case rpc:call(Node, Module, Function, [Val | Args], ?TIMEOUT_DISTRIBUTED_HOOK) of
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{badrpc, Reason} ->
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?ERROR_MSG("Bad RPC error to ~p: ~p~nrunning hook: ~p",
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[Node, Reason, {Hook, Args}]),
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run_fold1(Ls, Hook, Val, Args);
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timeout ->
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?ERROR_MSG("Timeout on RPC to ~p~nrunning hook: ~p",
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[Node, {Hook, Args}]),
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run_fold1(Ls, Hook, Val, Args);
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stop ->
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stopped;
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{stop, NewVal} ->
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?INFO_MSG("~nThe process ~p in node ~p ran a hook in node ~p.~n"
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"Stop, and the NewVal is:~n~p", [self(), node(), Node, NewVal]), % debug code
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NewVal;
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NewVal ->
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?INFO_MSG("~nThe process ~p in node ~p ran a hook in node ~p.~n"
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"The NewVal is:~n~p", [self(), node(), Node, NewVal]), % debug code
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run_fold1(Ls, Hook, NewVal, Args)
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end;
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run_fold1([{_Seq, Module, Function} | Ls], Hook, Val, Args) ->
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Res = if is_function(Function) ->
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catch apply(Function, [Val | Args]);
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true ->
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catch apply(Module, Function, [Val | Args])
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end,
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case Res of
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{'EXIT', Reason} ->
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?ERROR_MSG("~p~nrunning hook: ~p",
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[Reason, {Hook, Args}]),
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run_fold1(Ls, Hook, Val, Args);
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stop ->
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stopped;
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{stop, NewVal} ->
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NewVal;
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NewVal ->
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run_fold1(Ls, Hook, NewVal, Args)
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end.
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