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%% This Source Code Form is subject to the terms of the Mozilla Public
%% License, v. 2.0. If a copy of the MPL was not distributed with this
%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
%%
%% Copyright (c) 2007-2020 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(rabbit_connection_sup).
%% Supervisor for a (network) AMQP 0-9-1 client connection.
%%
%% Supervises
%%
%% * rabbit_reader
%% * Auxiliary process supervisor
%%
%% See also rabbit_reader, rabbit_connection_helper_sup.
-behaviour(supervisor2).
-behaviour(ranch_protocol).
-export([start_link/4, reader/1]).
-export([init/1]).
-include("rabbit.hrl").
%%----------------------------------------------------------------------------
-spec start_link(any(), rabbit_net:socket(), module(), any()) ->
{'ok', pid(), pid()}.
start_link(Ref, _Sock, _Transport, _Opts) ->
{ok, SupPid} = supervisor2:start_link(?MODULE, []),
%% We need to get channels in the hierarchy here so they get shut
%% down after the reader, so the reader gets a chance to terminate
%% them cleanly. But for 1.0 readers we can't start the real
%% ch_sup_sup (because we don't know if we will be 0-9-1 or 1.0) -
%% so we add another supervisor into the hierarchy.
%%
%% This supervisor also acts as an intermediary for heartbeaters and
%% the queue collector process, since these must not be siblings of the
%% reader due to the potential for deadlock if they are added/restarted
%% whilst the supervision tree is shutting down.
{ok, HelperSup} =
supervisor2:start_child(
SupPid,
{helper_sup, {rabbit_connection_helper_sup, start_link, []},
intrinsic, infinity, supervisor, [rabbit_connection_helper_sup]}),
{ok, ReaderPid} =
supervisor2:start_child(
SupPid,
{reader, {rabbit_reader, start_link, [HelperSup, Ref]},
intrinsic, ?WORKER_WAIT, worker, [rabbit_reader]}),
{ok, SupPid, ReaderPid}.
-spec reader(pid()) -> pid().
reader(Pid) ->
hd(supervisor2:find_child(Pid, reader)).
%%--------------------------------------------------------------------------
init([]) ->
?LG_PROCESS_TYPE(connection_sup),
{ok, {{one_for_all, 0, 1}, []}}.
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