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%%%---------------------------------------------------------------------- |
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%%% File : mongoose_packet_handler.erl |
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%%% Author : Piotr Nosek <piotr.nosek@erlang-solutions.com> |
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%%% Purpose : Packet handler behaviour |
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%%% Created : 24 Jan 2017 |
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%%%---------------------------------------------------------------------- |
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-module(mongoose_packet_handler). |
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-author('piotr.nosek@erlang-solutions.com'). |
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-record(packet_handler, { |
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handler :: process_packet(), |
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extra :: extra() |
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}). |
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-type extra() :: map(). |
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-type t() :: #packet_handler{}. |
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-export_type([t/0]). |
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-define(ARGS, Acc :: mongoose_acc:t(), |
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From :: jid:jid(), |
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To :: jid:jid(), |
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El :: exml:element(), |
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Extra :: extra()). |
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-type process_packet() :: fun((?ARGS) -> mongoose_acc:t()). |
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-callback process_packet(?ARGS) -> mongoose_acc:t(). |
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%%---------------------------------------------------------------------- |
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%% API |
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%%---------------------------------------------------------------------- |
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-export([new/1, new/2, process/5, add_extra/2]). |
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%% Getters |
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-export([module/1, extra/1]). |
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-spec new(Module :: module()) -> t(). |
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new(Module) -> |
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new(Module, #{}). |
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-spec new(Module :: module(), Extra :: extra()) -> t(). |
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new(Module, Extra) when is_atom(Module), is_map(Extra) -> |
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#packet_handler{handler = fun Module:process_packet/5, extra = Extra }. |
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-spec process(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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El :: exml:element()) -> mongoose_acc:t(). |
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process(#packet_handler{handler = ProcessPacket, extra = Extra }, Acc, From, To, El) -> |
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ProcessPacket(Acc, From, To, El, Extra). |
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module(#packet_handler{handler = ProcessPacket }) -> |
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{_, Module} = erlang:fun_info(ProcessPacket, module), |
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Module. |
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extra(#packet_handler{ extra = Extra }) -> |
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:-( |
Extra. |
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add_extra(#packet_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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NewExtra = maps:merge(Extra, OldExtra), |
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Handler#packet_handler{extra = NewExtra}. |