mirror of
https://github.com/processone/ejabberd.git
synced 2024-09-25 14:24:55 +02:00
feat: Hook subscribers
This commit is contained in:
Pouriya
badlop
parent
3124644315
commit
82d95ac81d
@ -34,6 +34,10 @@
|
||||
delete/3,
|
||||
delete/4,
|
||||
delete/5,
|
||||
subscribe/4,
|
||||
subscribe/5,
|
||||
unsubscribe/4,
|
||||
unsubscribe/5,
|
||||
run/2,
|
||||
run/3,
|
||||
run_fold/3,
|
||||
@ -59,6 +63,8 @@
|
||||
-include("ejabberd_stacktrace.hrl").
|
||||
|
||||
-record(state, {}).
|
||||
-type subscriber() :: {Module :: atom(), Function :: atom(), InitArg :: any()}.
|
||||
-type subscriber_event() :: before | 'after' | before_callback | after_callback.
|
||||
-type hook() :: {Seq :: integer(), Module :: atom(), Function :: atom() | fun()}.
|
||||
|
||||
-define(TRACE_HOOK_KEY, '$trace_hook').
|
||||
@ -87,6 +93,34 @@ add(Hook, Module, Function, Seq) ->
|
||||
add(Hook, Host, Module, Function, Seq) ->
|
||||
gen_server:call(?MODULE, {add, Hook, Host, Module, Function, Seq}).
|
||||
|
||||
-spec subscribe(atom(), atom(), atom(), any()) -> ok.
|
||||
%% @doc Add a subscriber to this hook.
|
||||
%%
|
||||
%% Before running any hook callback, the subscriber will be called in form of
|
||||
%% Module:Function(InitArg, 'before', Host :: binary() | global, Hook, HookArgs)
|
||||
%% Above function should return new state.
|
||||
%%
|
||||
%% Before running each callback, the subscriber will be called in form of
|
||||
%% Module:Function(State, 'before_callback', Host :: binary() | global, Hook, {CallbackMod, CallbackArg, Seq, HookArgs})
|
||||
%% Above function should return new state.
|
||||
%%
|
||||
%% After running each callback, the subscriber will be called in form of
|
||||
%% Module:Function(State, 'after_callback', Host :: binary() | global, Hook, {CallbackMod, CallbackArg, Seq, HookArgs})
|
||||
%% Above function should return new state.
|
||||
%%
|
||||
%% After running any hook callback, the subscriber will be called in form of
|
||||
%% Module:Function(State, 'after', Host :: binary() | global, Hook, HookArgs)
|
||||
%% Return value of this function call will be dropped.
|
||||
%%
|
||||
%% For every ejabberd_hooks:[run|run_fold] for every subscriber above functions will be called and the hook runner
|
||||
%% maintains State in above four calls.
|
||||
subscribe(Hook, Module, Function, InitArg) ->
|
||||
subscribe(Hook, global, Module, Function, InitArg).
|
||||
|
||||
-spec subscribe(atom(), binary() | global, atom(), atom(), any()) -> ok.
|
||||
subscribe(Hook, Host, Module, Function, InitArg) ->
|
||||
gen_server:call(?MODULE, {subscribe, Hook, Host, Module, Function, InitArg}).
|
||||
|
||||
-spec delete(atom(), fun(), integer()) -> ok.
|
||||
%% @doc See del/4.
|
||||
delete(Hook, Function, Seq) when is_function(Function) ->
|
||||
@ -105,8 +139,20 @@ delete(Hook, Module, Function, Seq) ->
|
||||
delete(Hook, Host, Module, Function, Seq) ->
|
||||
gen_server:call(?MODULE, {delete, Hook, Host, Module, Function, Seq}).
|
||||
|
||||
|
||||
|
||||
-spec unsubscribe(atom(), atom(), atom(), any()) -> ok.
|
||||
%% @doc Removes a subscriber from this hook.
|
||||
unsubscribe(Hook, Module, Function, InitArg) ->
|
||||
unsubscribe(Hook, global, Module, Function, InitArg).
|
||||
|
||||
-spec unsubscribe(atom(), binary() | global, atom(), atom(), any()) -> ok.
|
||||
unsubscribe(Hook, Host, Module, Function, InitArg) ->
|
||||
gen_server:call(?MODULE, {unsubscribe, Hook, Host, Module, Function, InitArg}).
|
||||
|
||||
|
||||
-spec run(atom(), list()) -> ok.
|
||||
%% @doc Run the calls of this hook in order, don't care about function results.
|
||||
%% @doc Run the calls (and subscibers) of this hook in order, don't care about function results.
|
||||
%% If a call returns stop, no more calls are performed.
|
||||
run(Hook, Args) ->
|
||||
run(Hook, global, Args).
|
||||
@ -114,17 +160,28 @@ run(Hook, Args) ->
|
||||
-spec run(atom(), binary() | global, list()) -> ok.
|
||||
run(Hook, Host, Args) ->
|
||||
try ets:lookup(hooks, {Hook, Host}) of
|
||||
[{_, Ls}] ->
|
||||
[{_, Ls, Subs}] ->
|
||||
case erlang:get(?TRACE_HOOK_KEY) of
|
||||
undefined ->
|
||||
undefined when Subs == [] ->
|
||||
run1(Ls, Hook, Args);
|
||||
undefined ->
|
||||
Subs2 = call_subscriber_list(Subs, Host, Hook, Args, before, []),
|
||||
Subs3 = run1(Ls, Hook, Args, Host, Subs2),
|
||||
_Subs4 = call_subscriber_list(Subs3, Host, Hook, Args, 'after', []),
|
||||
ok;
|
||||
TracingHooksOpts ->
|
||||
case do_get_tracing_options(Hook, Host, TracingHooksOpts) of
|
||||
undefined ->
|
||||
run1(Ls, Hook, Args);
|
||||
Subs2 = call_subscriber_list(Subs, Host, Hook, Args, before, []),
|
||||
Subs3 = run1(Ls, Hook, Args, Host, Subs2),
|
||||
_Subs4 = call_subscriber_list(Subs3, Host, Hook, Args, 'after', []),
|
||||
ok;
|
||||
TracingOpts ->
|
||||
foreach_start_hook_tracing(TracingOpts, Hook, Host, Args),
|
||||
run2(Ls, Hook, Args, Host, TracingOpts)
|
||||
Subs2 = call_subscriber_list(Subs, Host, Hook, Args, before, []),
|
||||
Subs3 = run2(Ls, Hook, Args, Host, TracingOpts, Subs2),
|
||||
_Subs4 = call_subscriber_list(Subs3, Host, Hook, Args, 'after', []),
|
||||
ok
|
||||
end
|
||||
end;
|
||||
[] ->
|
||||
@ -134,7 +191,7 @@ run(Hook, Host, Args) ->
|
||||
end.
|
||||
|
||||
-spec run_fold(atom(), T, list()) -> T.
|
||||
%% @doc Run the calls of this hook in order.
|
||||
%% @doc Run the calls (and subscribers) of this hook in order.
|
||||
%% The arguments passed to the function are: [Val | Args].
|
||||
%% The result of a call is used as Val for the next call.
|
||||
%% If a call returns 'stop', no more calls are performed.
|
||||
@ -145,17 +202,28 @@ run_fold(Hook, Val, Args) ->
|
||||
-spec run_fold(atom(), binary() | global, T, list()) -> T.
|
||||
run_fold(Hook, Host, Val, Args) ->
|
||||
try ets:lookup(hooks, {Hook, Host}) of
|
||||
[{_, Ls}] ->
|
||||
[{_, Ls, Subs}] ->
|
||||
case erlang:get(?TRACE_HOOK_KEY) of
|
||||
undefined ->
|
||||
undefined when Subs == [] ->
|
||||
run_fold1(Ls, Hook, Val, Args);
|
||||
undefined ->
|
||||
Subs2 = call_subscriber_list(Subs, Host, Hook, [Val | Args], before, []),
|
||||
{Val2, Subs3} = run_fold1(Ls, Hook, Val, Args, Host, Subs2),
|
||||
_Subs4 = call_subscriber_list(Subs3, Host, Hook, [Val2 | Args], 'after', []),
|
||||
Val2;
|
||||
TracingHooksOpts ->
|
||||
case do_get_tracing_options(Hook, Host, TracingHooksOpts) of
|
||||
undefined ->
|
||||
run_fold1(Ls, Hook, Val, Args);
|
||||
Subs2 = call_subscriber_list(Subs, Host, Hook, [Val | Args], before, []),
|
||||
{Val2, Subs3} = run_fold1(Ls, Hook, Val, Args, Host, Subs2),
|
||||
_Subs4 = call_subscriber_list(Subs3, Host, Hook, [Val2 | Args], 'after', []),
|
||||
Val2;
|
||||
TracingOpts ->
|
||||
fold_start_hook_tracing(TracingOpts, Hook, Host, [Val | Args]),
|
||||
run_fold2(Ls, Hook, Val, Args, Host, TracingOpts)
|
||||
Subs2 = call_subscriber_list(Subs, Host, Hook, [Val | Args], before, []),
|
||||
{Val2, Subs3} = run_fold2(Ls, Hook, Val, Args, Host, TracingOpts, Subs2),
|
||||
_Subs4 = call_subscriber_list(Subs3, Host, Hook, [Val2 | Args], 'after', []),
|
||||
Val2
|
||||
end
|
||||
end;
|
||||
[] ->
|
||||
@ -230,6 +298,14 @@ handle_call({delete, Hook, Host, Module, Function, Seq}, _From, State) ->
|
||||
HookFormat = {Seq, Module, Function},
|
||||
Reply = handle_delete(Hook, Host, HookFormat),
|
||||
{reply, Reply, State};
|
||||
handle_call({subscribe, Hook, Host, Module, Function, InitArg}, _From, State) ->
|
||||
SubscriberFormat = {Module, Function, InitArg},
|
||||
Reply = handle_subscribe(Hook, Host, SubscriberFormat),
|
||||
{reply, Reply, State};
|
||||
handle_call({unsubscribe, Hook, Host, Module, Function, InitArg}, _From, State) ->
|
||||
SubscriberFormat = {Module, Function, InitArg},
|
||||
Reply = handle_unsubscribe(Hook, Host, SubscriberFormat),
|
||||
{reply, Reply, State};
|
||||
handle_call(Request, From, State) ->
|
||||
?WARNING_MSG("Unexpected call from ~p: ~p", [From, Request]),
|
||||
{noreply, State}.
|
||||
@ -237,27 +313,53 @@ handle_call(Request, From, State) ->
|
||||
-spec handle_add(atom(), atom(), hook()) -> ok.
|
||||
handle_add(Hook, Host, El) ->
|
||||
case ets:lookup(hooks, {Hook, Host}) of
|
||||
[{_, Ls}] ->
|
||||
[{_, Ls, Subs}] ->
|
||||
case lists:member(El, Ls) of
|
||||
true ->
|
||||
ok;
|
||||
false ->
|
||||
NewLs = lists:merge(Ls, [El]),
|
||||
ets:insert(hooks, {{Hook, Host}, NewLs}),
|
||||
ets:insert(hooks, {{Hook, Host}, NewLs, Subs}),
|
||||
ok
|
||||
end;
|
||||
[] ->
|
||||
NewLs = [El],
|
||||
ets:insert(hooks, {{Hook, Host}, NewLs}),
|
||||
ets:insert(hooks, {{Hook, Host}, NewLs, []}),
|
||||
ok
|
||||
end.
|
||||
|
||||
-spec handle_delete(atom(), atom(), hook()) -> ok.
|
||||
handle_delete(Hook, Host, El) ->
|
||||
case ets:lookup(hooks, {Hook, Host}) of
|
||||
[{_, Ls}] ->
|
||||
[{_, Ls, Subs}] ->
|
||||
NewLs = lists:delete(El, Ls),
|
||||
ets:insert(hooks, {{Hook, Host}, NewLs}),
|
||||
ets:insert(hooks, {{Hook, Host}, NewLs, Subs}),
|
||||
ok;
|
||||
[] ->
|
||||
ok
|
||||
end.
|
||||
|
||||
-spec handle_subscribe(atom(), atom(), subscriber()) -> ok.
|
||||
handle_subscribe(Hook, Host, El) ->
|
||||
case ets:lookup(hooks, {Hook, Host}) of
|
||||
[{_, Ls, Subs}] ->
|
||||
case lists:member(El, Subs) of
|
||||
true ->
|
||||
ok;
|
||||
false ->
|
||||
ets:insert(hooks, {{Hook, Host}, Ls, Subs ++ [El]}),
|
||||
ok
|
||||
end;
|
||||
[] ->
|
||||
ets:insert(hooks, {{Hook, Host}, [], [El]}),
|
||||
ok
|
||||
end.
|
||||
|
||||
-spec handle_unsubscribe(atom(), atom(), subscriber()) -> ok.
|
||||
handle_unsubscribe(Hook, Host, El) ->
|
||||
case ets:lookup(hooks, {Hook, Host}) of
|
||||
[{_, Ls, Subs}] ->
|
||||
ets:insert(hooks, {{Hook, Host}, Ls, lists:delete(El, Subs)}),
|
||||
ok;
|
||||
[] ->
|
||||
ok
|
||||
@ -310,6 +412,40 @@ run_fold1([{_Seq, Module, Function} | Ls], Hook, Val, Args) ->
|
||||
run_fold1(Ls, Hook, NewVal, Args)
|
||||
end.
|
||||
|
||||
-spec run1([hook()], atom(), list(), binary() | global, [subscriber()]) -> [subscriber()].
|
||||
run1([], _Hook, _Args, _Host, SubscriberList) ->
|
||||
SubscriberList;
|
||||
run1([{Seq, Module, Function} | Ls], Hook, Args, Host, SubscriberList) ->
|
||||
SubscriberList2 = call_subscriber_list(SubscriberList, Host, Hook, {Module, Function, Seq, Args}, before_callback, []),
|
||||
Res = safe_apply(Hook, Module, Function, Args),
|
||||
SubscriberList3 = call_subscriber_list(SubscriberList2, Host, Hook, {Module, Function, Seq, Args}, after_callback, []),
|
||||
case Res of
|
||||
'EXIT' ->
|
||||
run1(Ls, Hook, Args, Host, SubscriberList3);
|
||||
stop ->
|
||||
SubscriberList3;
|
||||
_ ->
|
||||
run1(Ls, Hook, Args, Host, SubscriberList3)
|
||||
end.
|
||||
|
||||
-spec run_fold1([hook()], atom(), T, list(), binary() | global, [subscriber()]) -> {T, [subscriber()]}.
|
||||
run_fold1([], _Hook, Val, _Args, _Host, SubscriberList) ->
|
||||
{Val, SubscriberList};
|
||||
run_fold1([{Seq, Module, Function} | Ls], Hook, Val, Args, Host, SubscriberList) ->
|
||||
SubscriberList2 = call_subscriber_list(SubscriberList, Host, Hook, {Module, Function, Seq, [Val | Args]}, before_callback, []),
|
||||
Res = safe_apply(Hook, Module, Function, [Val | Args]),
|
||||
SubscriberList3 = call_subscriber_list(SubscriberList2, Host, Hook, {Module, Function, Seq, [Val | Args]}, after_callback, []),
|
||||
case Res of
|
||||
'EXIT' ->
|
||||
run_fold1(Ls, Hook, Val, Args, Host, SubscriberList3);
|
||||
stop ->
|
||||
{Val, SubscriberList3};
|
||||
{stop, NewVal} ->
|
||||
{NewVal, SubscriberList3};
|
||||
NewVal ->
|
||||
run_fold1(Ls, Hook, NewVal, Args, Host, SubscriberList3)
|
||||
end.
|
||||
|
||||
-spec safe_apply(atom(), atom(), atom() | fun(), list()) -> any().
|
||||
safe_apply(Hook, Module, Function, Args) ->
|
||||
?DEBUG("Running hook ~p: ~p:~p/~B",
|
||||
@ -332,6 +468,32 @@ safe_apply(Hook, Module, Function, Args) ->
|
||||
'EXIT'
|
||||
end.
|
||||
|
||||
-spec call_subscriber_list([subscriber()], binary() | global, atom(), {atom(), atom(), integer(), list()} | list(), subscriber_event(), [subscriber()]) -> any().
|
||||
call_subscriber_list([], _Host, _Hook, _CallbackOrArgs, _Event, []) ->
|
||||
[];
|
||||
call_subscriber_list([], _Host, _Hook, _CallbackOrArgs, _Event, Result) ->
|
||||
lists:reverse(Result);
|
||||
call_subscriber_list([{Mod, Func, InitArg} | SubscriberList], Host, Hook, CallbackOrArgs, Event, Result) ->
|
||||
SubscriberArgs = [InitArg, Event, Host, Hook, CallbackOrArgs],
|
||||
?DEBUG("Running hook subsciber ~p: ~p:~p/~B with event ~p",
|
||||
[Hook, Mod, Func, length(SubscriberArgs), Event]),
|
||||
try apply(Mod, Func, SubscriberArgs) of
|
||||
State ->
|
||||
call_subscriber_list(SubscriberList, Host, Hook, CallbackOrArgs, Event, [{Mod, Func, State} | Result])
|
||||
catch ?EX_RULE(E, R, St) when E /= exit; R /= normal ->
|
||||
Stack = ?EX_STACK(St),
|
||||
?ERROR_MSG("Hook subscriber ~p crashed when running ~p:~p/~p:~n" ++
|
||||
string:join(
|
||||
["** ~ts"|
|
||||
["** Arg " ++ integer_to_list(I) ++ " = ~p"
|
||||
|| I <- lists:seq(1, length(SubscriberArgs))]],
|
||||
"~n"),
|
||||
[Hook, Mod, Func, length(SubscriberArgs),
|
||||
misc:format_exception(2, E, R, Stack)|SubscriberArgs]),
|
||||
%% Do not append subscriber for next calls:
|
||||
call_subscriber_list(SubscriberList, Host, Hook, CallbackOrArgs, Event, Result)
|
||||
end.
|
||||
|
||||
%%%----------------------------------------------------------------------
|
||||
%%% Internal tracing functions
|
||||
%%%----------------------------------------------------------------------
|
||||
@ -453,41 +615,45 @@ do_get_tracing_options(Hook, Host, MaybeMap) ->
|
||||
end
|
||||
end.
|
||||
|
||||
run2([], Hook, Args, Host, Opts) ->
|
||||
run2([], Hook, Args, Host, Opts, SubscriberList) ->
|
||||
foreach_stop_hook_tracing(Opts, Hook, Host, Args, undefined),
|
||||
ok;
|
||||
run2([{Seq, Module, Function} | Ls], Hook, Args, Host, TracingOpts) ->
|
||||
SubscriberList;
|
||||
run2([{Seq, Module, Function} | Ls], Hook, Args, Host, TracingOpts, SubscriberList) ->
|
||||
foreach_start_callback_tracing(TracingOpts, Hook, Host, Module, Function, Args, Seq),
|
||||
SubscriberList2 = call_subscriber_list(SubscriberList, Host, Hook, {Module, Function, Seq, Args}, before_callback, []),
|
||||
Res = safe_apply(Hook, Module, Function, Args),
|
||||
SubscriberList3 = call_subscriber_list(SubscriberList2, Host, Hook, {Module, Function, Seq, Args}, after_callback, []),
|
||||
foreach_stop_callback_tracing(TracingOpts, Hook, Host, Module, Function, Args, Seq, Res),
|
||||
case Res of
|
||||
'EXIT' ->
|
||||
run2(Ls, Hook, Args, Host, TracingOpts);
|
||||
run2(Ls, Hook, Args, Host, TracingOpts, SubscriberList3);
|
||||
stop ->
|
||||
foreach_stop_hook_tracing(TracingOpts, Hook, Host, Args, {Module, Function, Seq, Ls}),
|
||||
ok;
|
||||
SubscriberList3;
|
||||
_ ->
|
||||
run2(Ls, Hook, Args, Host, TracingOpts)
|
||||
run2(Ls, Hook, Args, Host, TracingOpts, SubscriberList3)
|
||||
end.
|
||||
|
||||
run_fold2([], Hook, Val, Args, Host, Opts) ->
|
||||
run_fold2([], Hook, Val, Args, Host, Opts, SubscriberList) ->
|
||||
fold_stop_hook_tracing(Opts, Hook, Host, [Val | Args], undefined),
|
||||
Val;
|
||||
run_fold2([{Seq, Module, Function} | Ls], Hook, Val, Args, Host, TracingOpts) ->
|
||||
{Val, SubscriberList};
|
||||
run_fold2([{Seq, Module, Function} | Ls], Hook, Val, Args, Host, TracingOpts, SubscriberList) ->
|
||||
fold_start_callback_tracing(TracingOpts, Hook, Host, Module, Function, [Val | Args], Seq),
|
||||
SubscriberList2 = call_subscriber_list(SubscriberList, Host, Hook, {Module, Function, Seq, [Val | Args]}, before_callback, []),
|
||||
Res = safe_apply(Hook, Module, Function, [Val | Args]),
|
||||
SubscriberList3 = call_subscriber_list(SubscriberList2, Host, Hook, {Module, Function, Seq, [Val | Args]}, after_callback, []),
|
||||
fold_stop_callback_tracing(TracingOpts, Hook, Host, Module, Function, [Val | Args], Seq, Res),
|
||||
case Res of
|
||||
'EXIT' ->
|
||||
run_fold2(Ls, Hook, Val, Args, Host, TracingOpts);
|
||||
run_fold2(Ls, Hook, Val, Args, Host, TracingOpts, SubscriberList3);
|
||||
stop ->
|
||||
fold_stop_hook_tracing(TracingOpts, Hook, Host, [Val | Args], {Module, Function, Seq, {old, Val}, Ls}),
|
||||
Val;
|
||||
{Val, SubscriberList3};
|
||||
{stop, NewVal} ->
|
||||
fold_stop_hook_tracing(TracingOpts, Hook, Host, [Val | Args], {Module, Function, Seq, {new, NewVal}, Ls}),
|
||||
NewVal;
|
||||
{NewVal, SubscriberList3};
|
||||
NewVal ->
|
||||
run_fold2(Ls, Hook, NewVal, Args, Host, TracingOpts)
|
||||
run_fold2(Ls, Hook, NewVal, Args, Host, TracingOpts, SubscriberList3)
|
||||
end.
|
||||
|
||||
foreach_start_hook_tracing(TracingOpts, Hook, Host, Args) ->
|
||||
|
||||
Loading…
Reference in New Issue
Block a user