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-module(mongoose_iq_handler). |
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-include("mongoose.hrl"). |
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-include("jlib.hrl"). |
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%%---------------------------------------------------------------------- |
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%% Types |
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%%---------------------------------------------------------------------- |
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-record(iq_handler, {handler_fn :: handler_fn(), |
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extra :: map(), |
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execution_method :: execution_method()}). |
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-type t() :: #iq_handler{}. |
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-type handler_fn() :: fun((Acc :: mongoose_acc:t(), |
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From :: jid:jid(), |
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To :: jid:jid(), |
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IQ :: jlib:iq(), |
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Extra :: map()) -> {NewAcc :: mongoose_acc:t(), |
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IQResp :: ignore | jlib:iq()}). |
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-type execution_method() :: no_queue | parallel | {one_queue, pid()} | {queues, [pid()]}. |
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-type execution_type() :: no_queue | parallel | one_queue | {queues, pos_integer()}. |
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-export_type([t/0, handler_fn/0, execution_type/0]). |
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%%---------------------------------------------------------------------- |
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%% API |
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%%---------------------------------------------------------------------- |
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-export([new/3, |
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delete/1, |
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process_iq/5, |
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add_extra/2, |
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execute_handler/5]). |
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%% Getters |
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-export([module/1, extra/1]). |
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-ignore_xref([module/1]). |
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-spec new(IQHandlerFn :: handler_fn(), |
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Extra :: map(), |
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ExecutionType :: execution_type()) -> t(). |
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new(IQHandlerFn, Extra, ExecutionType) -> |
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6944 |
ExecutionMethod = execution_method(ExecutionType), |
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6944 |
#iq_handler{handler_fn = IQHandlerFn, extra = Extra, |
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execution_method = ExecutionMethod}. |
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-spec delete(IQHandler :: t()) -> ok. |
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delete(#iq_handler{execution_method = ExecutionMethod}) -> |
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6112 |
case ExecutionMethod of |
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3886 |
{one_queue, Pid} -> mongoose_iq_worker:stop(Pid); |
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{queues, Pids} -> |
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:-( |
[mongoose_iq_worker:stop(Pid) || Pid <- Pids], |
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:-( |
ok; |
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2226 |
_ -> ok |
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end. |
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-spec module(t()) -> module(). |
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module(#iq_handler{handler_fn = Fn}) -> |
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:-( |
{module, Mod} = erlang:fun_info(Fn, module), |
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:-( |
Mod. |
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-spec process_iq(Handler :: t(), |
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Acc :: mongoose_acc:t(), |
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From :: jid:jid(), |
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To :: jid:jid(), |
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IQ :: jlib:iq()) -> mongoose_acc:t(). |
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process_iq(#iq_handler{execution_method = ExecutionMethod} = Handler, |
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Acc, From, To, IQ) -> |
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4056 |
case ExecutionMethod of |
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no_queue -> |
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1440 |
?MODULE:execute_handler(Handler, Acc, From, To, IQ); |
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{one_queue, Pid} -> |
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581 |
mongoose_iq_worker:process_iq(Pid, Handler, Acc, From, To, IQ), |
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581 |
Acc; |
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{queues, Pids} -> |
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:-( |
Pid = lists:nth(rand:uniform(length(Pids)), Pids), |
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:-( |
mongoose_iq_worker:process_iq(Pid, Handler, Acc, From, To, IQ), |
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:-( |
Acc; |
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parallel -> |
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2035 |
spawn(?MODULE, execute_handler, [Handler, Acc, From, To, IQ]), |
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2035 |
Acc |
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end. |
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-spec extra(t()) -> map(). |
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extra(#iq_handler{ extra = Extra }) -> |
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Extra. |
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-spec add_extra(t(), map()) -> t(). |
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add_extra(#iq_handler{ extra = OldExtra } = Handler, Extra) -> |
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%% KV pairs from the OldExtra map will remain unchanged, only |
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%% the new keys from Extra map will be added to the NewExtra map |
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6888 |
NewExtra = maps:merge(Extra, OldExtra), |
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6888 |
Handler#iq_handler{extra = NewExtra}. |
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-spec execute_handler(Handler :: t(), |
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Acc :: mongoose_acc:t(), |
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From :: jid:jid(), |
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To :: jid:jid(), |
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IQ :: jlib:iq()) -> mongoose_acc:t(). |
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execute_handler(#iq_handler{handler_fn = IQHandlerFn, extra = Extra}, |
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Acc, From, To, IQ = #iq{sub_el = SubEl, lang = Lang}) -> |
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4056 |
try IQHandlerFn(Acc, From, To, IQ, Extra) of |
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{Acc1, ignore} -> |
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Acc1; |
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{Acc1, ResIQ} -> |
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3948 |
reply(From, To, Acc1, ResIQ) |
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catch |
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Class:Reason:StackTrace -> |
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:-( |
?LOG_WARNING(#{what => process_iq_error, from => From, to => To, iq => IQ, |
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acc => Acc, extra => Extra, handler_function => IQHandlerFn, |
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:-( |
class => Class, reason => Reason, stacktrace => StackTrace}), |
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:-( |
ErrorMsg = <<"The server could not process the IQ stanza">>, |
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:-( |
ErrorEl = mongoose_xmpp_errors:internal_server_error(Lang, ErrorMsg), |
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:-( |
ErrorIQ = IQ#iq{type = error, sub_el = [SubEl, ErrorEl]}, |
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:-( |
reply(From, To, Acc, ErrorIQ) |
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end. |
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-spec reply(jid:jid(), jid:jid(), mongoose_acc:t(), jlib:iq()) -> mongoose_acc:t(). |
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reply(From, To, Acc, IQReply) -> |
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3948 |
ejabberd_router:route(To, From, Acc, jlib:iq_to_xml(IQReply)). |
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%%-------------------------------------------------------------------- |
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%% Internal functions |
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%%-------------------------------------------------------------------- |
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-spec execution_method(execution_type()) -> execution_method(). |
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execution_method(ExecutionType) -> |
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6944 |
case ExecutionType of |
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no_queue -> no_queue; |
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1267 |
parallel -> parallel; |
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one_queue -> |
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4718 |
{ok, Pid} = mongoose_iq_worker:start(), |
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4718 |
{one_queue, Pid}; |
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{queues, N} -> |
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:-( |
Pids = lists:map(fun(_) -> |
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:-( |
{ok, Pid} = mongoose_iq_worker:start(), |
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:-( |
Pid |
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end, lists:seq(1, N)), |
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:-( |
{queues, Pids} |
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end. |