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%%============================================================================== |
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%% Copyright 2018 Erlang Solutions Ltd. |
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%% |
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%% Licensed under the Apache License, Version 2.0 (the "License"); |
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%% you may not use this file except in compliance with the License. |
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%% You may obtain a copy of the License at |
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%% |
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%% http://www.apache.org/licenses/LICENSE-2.0 |
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%% |
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%% Unless required by applicable law or agreed to in writing, software |
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%% distributed under the License is distributed on an "AS IS" BASIS, |
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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%% See the License for the specific language governing permissions and |
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%% limitations under the License. |
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%%============================================================================== |
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-module(mongoose_udp_listener). |
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-author('konrad.zemek@erlang-solutions.com'). |
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-include("mongoose.hrl"). |
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-type udp_listen_option() :: gen_udp:option() |
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| {ip, _} |
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| {fd, pos_integer()} |
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| {ifaddr, _} |
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| inet:address_family() |
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| {port, inet:port_number()}. |
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-export([start_link/6, init/6]). |
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%% Internal |
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-export([recv_loop/3]). |
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-ignore_xref([start_link/6, init/6]). |
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%%-------------------------------------------------------------------- |
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%% API |
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%%-------------------------------------------------------------------- |
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-spec start_link(Id :: mongoose_listener_config:listener_id(), |
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Module :: atom(), |
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Opts :: [any(), ...], |
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SockOpts :: [udp_listen_option()], |
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Port :: inet:port_number(), |
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IPS :: [any()]) -> any(). |
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start_link(Id, Module, Opts, SockOpts, Port, IPS) -> |
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:-( |
proc_lib:start_link(?MODULE, init, [Id, Module, Opts, SockOpts, Port, IPS]). |
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-spec init(Id :: mongoose_listener_config:listener_id(), |
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Module :: atom(), |
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Opts :: [any(), ...], |
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SockOpts :: [udp_listen_option()], |
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Port :: inet:port_number(), |
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IPS :: [any()]) -> no_return(). |
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init(Id, Module, Opts, SockOpts, Port, IPS) -> |
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:-( |
case gen_udp:open(Port, [binary, {active, false}, {reuseaddr, true} |
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| SockOpts]) of |
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{ok, Socket} -> |
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%% Inform my parent that this port was opened succesfully |
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:-( |
proc_lib:init_ack({ok, self()}), |
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recv_loop(Socket, Module, Opts); |
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{error, Reason} -> |
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ejabberd_listener:socket_error(Reason, Id, Module, SockOpts, Port, IPS) |
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end. |
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%%-------------------------------------------------------------------- |
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%% Helpers |
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%%-------------------------------------------------------------------- |
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-spec recv_loop(Socket :: port(), |
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Module :: atom(), |
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Opts :: [any(), ...]) -> no_return(). |
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recv_loop(Socket, Module, Opts) -> |
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:-( |
case gen_udp:recv(Socket, 0) of |
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{ok, {Addr, Port, Packet}} -> |
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:-( |
try Module:udp_recv(Socket, Addr, Port, Packet, Opts) |
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catch Class:Reason:Stacktrace -> |
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?LOG_ERROR(#{what => udp_listener_recv_failed, |
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text => <<"Failed to process UDP packet">>, |
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socket => Socket, handler_module => Module, |
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ip => Addr, port => Port, |
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class => Class, reason => Reason, |
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stacktrace => Stacktrace, udp_packet => Packet}) |
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end, |
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?MODULE:recv_loop(Socket, Module, Opts); |
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{error, Reason} -> |
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?LOG_ERROR(#{what => udp_listener_recv_failed, |
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text => <<"Unexpected UDP error">>, |
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socket => Socket, handler_module => Module, |
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reason => ejabberd_listener:format_error(Reason)}), |
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exit({error, Reason}) |
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end. |