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%%% Textgroup server. |
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%%% |
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%%% Copyright (c) 2022, 2023 Holger Weiss <holger@zedat.fu-berlin.de>. |
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%%% All rights reserved. |
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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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-module(textgroup_acceptor). |
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-export([start_link/1]). |
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-export([init/1]). |
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-export([loop/1]). |
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-export([system_continue/3, |
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system_terminate/4, |
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system_code_change/4]). |
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-export_type([state/0]). |
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-include_lib("kernel/include/logger.hrl"). |
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-record(acceptor_state, |
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{parent :: pid() | undefined, |
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listener :: gen_tcp:socket() | undefined}). |
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-opaque state() :: #acceptor_state{}. |
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%% API. |
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-spec start_link(gen_tcp:socket()) -> term() | {error, term()}. |
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start_link(Listener) -> |
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?LOG_DEBUG("Creating acceptor process"), |
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State = #acceptor_state{parent = self(), listener = Listener}, |
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proc_lib:start_link(?MODULE, init, [State]). |
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-spec init(state()) -> no_return(). |
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init(State) -> |
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?LOG_DEBUG("Initializing acceptor process"), |
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process_flag(trap_exit, true), |
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proc_lib:init_ack({ok, self()}), |
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loop(State). |
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-spec system_continue(pid(), [sys:dbg_opt()], state()) -> no_return(). |
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system_continue(_Parent, _Debug, State) -> |
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?LOG_DEBUG("Continuing acceptor process after handling system message"), |
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loop(State). |
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-spec system_terminate(term(), pid(), [sys:dbg_opt()], state()) -> no_return(). |
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system_terminate(Reason, _Parent, _Debug, _State) -> |
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?LOG_DEBUG("Terminating acceptor process (~p)", [Reason]), |
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exit(Reason). |
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-spec system_code_change(state(), module(), term() | undefined, term()) |
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-> {ok, state()}. |
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system_code_change(State, _Mod, _OldVsn, _Extra) -> |
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?LOG_DEBUG("Got code change request"), |
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{ok, State}. |
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%% Internal functions. |
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-spec loop(state()) -> no_return(). |
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loop(#acceptor_state{parent = Parent, listener = Listener} = State) -> |
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case gen_tcp:accept(Listener, timer:seconds(3)) of |
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{ok, Socket} -> |
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ok = handle_connection(Socket); |
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{error, timeout} -> |
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ok |
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end, |
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receive |
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{system, From, Request} -> |
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sys:handle_system_msg(Request, From, Parent, ?MODULE, [], State); |
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{'EXIT', Parent, Reason} -> |
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system_terminate(Reason, Parent, [], State); |
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Msg -> |
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?LOG_ERROR("Got unexpected message: ~p", [Msg]), |
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?MODULE:loop(State) |
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after 0 -> |
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?MODULE:loop(State) |
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end. |
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-spec handle_connection(gen_tcp:socket()) -> ok. |
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handle_connection(Socket) -> |
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{ok, {LAddr, LPort}} = inet:sockname(Socket), |
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{ok, {RAddr, RPort}} = inet:peername(Socket), |
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?LOG_INFO("Accepting connection: ~s:~B -> ~s:~B", |
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[inet:ntoa(RAddr), RPort, |
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inet:ntoa(LAddr), LPort]), |
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ok = textgroup_client:start(Socket). |