From e8d6401741021f76988091e6dc633afb65ffbe7b Mon Sep 17 00:00:00 2001
From: juhlig <j.uhlig@mailingwork.de>
Date: Fri, 21 Jun 2019 16:01:22 +0200
Subject: Embedded listeners depending on ranch_server

---
 src/ranch.erl              | 10 +++++---
 src/ranch_embedded_sup.erl | 34 ++++++++++++++++++++++++++
 src/ranch_server_proxy.erl | 61 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 101 insertions(+), 4 deletions(-)
 create mode 100644 src/ranch_embedded_sup.erl
 create mode 100644 src/ranch_server_proxy.erl

(limited to 'src')

diff --git a/src/ranch.erl b/src/ranch.erl
index b26f3a6..0e3541f 100644
--- a/src/ranch.erl
+++ b/src/ranch.erl
@@ -73,8 +73,10 @@ start_listener(Ref, Transport, TransOpts0, Protocol, ProtoOpts)
 	_ = code:ensure_loaded(Transport),
 	case {erlang:function_exported(Transport, name, 0), validate_transport_opts(TransOpts)} of
 		{true, ok} ->
-			maybe_started(supervisor:start_child(ranch_sup, child_spec(Ref,
-					Transport, TransOpts, Protocol, ProtoOpts)));
+			ChildSpec = #{id => {ranch_listener_sup, Ref}, start => {ranch_listener_sup, start_link, [
+				Ref, Transport, TransOpts, Protocol, ProtoOpts
+			]}, type => supervisor},
+			maybe_started(supervisor:start_child(ranch_sup, ChildSpec));
 		{false, _} ->
 			{error, {bad_transport, Transport}};
 		{_, TransOptsError} ->
@@ -191,9 +193,9 @@ maybe_resumed(Res) ->
 	-> supervisor:child_spec().
 child_spec(Ref, Transport, TransOpts0, Protocol, ProtoOpts) ->
 	TransOpts = normalize_opts(TransOpts0),
-	{{ranch_listener_sup, Ref}, {ranch_listener_sup, start_link, [
+	#{id => {ranch_embedded_sup, Ref}, start => {ranch_embedded_sup, start_link, [
 		Ref, Transport, TransOpts, Protocol, ProtoOpts
-	]}, permanent, infinity, supervisor, [ranch_listener_sup]}.
+	]}, type => supervisor}.
 
 -spec handshake(ref()) -> {ok, ranch_transport:socket()}.
 handshake(Ref) ->
diff --git a/src/ranch_embedded_sup.erl b/src/ranch_embedded_sup.erl
new file mode 100644
index 0000000..aa157e0
--- /dev/null
+++ b/src/ranch_embedded_sup.erl
@@ -0,0 +1,34 @@
+%% Copyright (c) 2019, Jan Uhlig <ju@mailingwork.de>
+%%
+%% Permission to use, copy, modify, and/or distribute this software for any
+%% purpose with or without fee is hereby granted, provided that the above
+%% copyright notice and this permission notice appear in all copies.
+%%
+%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+-module(ranch_embedded_sup).
+
+-behavior(supervisor).
+
+-export([start_link/5]).
+-export([init/1]).
+
+-spec start_link(ranch:ref(), module(), any(), module(), any())
+        -> {ok, pid()}.
+start_link(Ref, Transport, TransOpts, Protocol, ProtoOpts) ->
+	supervisor:start_link(?MODULE, {Ref, Transport, TransOpts, Protocol, ProtoOpts}).
+
+init({Ref, Transport, TransOpts, Protocol, ProtoOpts}) ->
+	Proxy = #{id => ranch_server_proxy,
+		start => {ranch_server_proxy, start_link, []},
+		shutdown => brutal_kill},
+	Listener = #{id => {ranch_listener_sup, Ref},
+		start => {ranch_listener_sup, start_link, [Ref, Transport, TransOpts, Protocol, ProtoOpts]},
+		type => supervisor},
+	{ok, {#{strategy => rest_for_one}, [Proxy, Listener]}}.
diff --git a/src/ranch_server_proxy.erl b/src/ranch_server_proxy.erl
new file mode 100644
index 0000000..949ac33
--- /dev/null
+++ b/src/ranch_server_proxy.erl
@@ -0,0 +1,61 @@
+%% Copyright (c) 2019, Jan Uhlig <ju@mailingwork.de>
+%%
+%% Permission to use, copy, modify, and/or distribute this software for any
+%% purpose with or without fee is hereby granted, provided that the above
+%% copyright notice and this permission notice appear in all copies.
+%%
+%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+-module(ranch_server_proxy).
+
+-behavior(gen_server).
+
+-export([start_link/0]).
+-export([init/1]).
+-export([handle_call/3]).
+-export([handle_cast/2]).
+-export([handle_info/2]).
+-export([code_change/3]).
+
+start_link() ->
+	gen_server:start_link(?MODULE, [], []).
+
+init([]) ->
+	case wait_ranch_server(50) of
+		{ok, Monitor} ->
+			{ok, Monitor, hibernate};
+		{error, Reason} ->
+			{stop, Reason}
+	end.
+
+handle_call(_, _, Monitor) ->
+	{noreply, Monitor, hibernate}.
+
+handle_cast(_, Monitor) ->
+	{noreply, Monitor, hibernate}.
+
+handle_info({'DOWN', Monitor, process, _, Reason}, Monitor) ->
+	{stop, Reason, Monitor};
+handle_info(_, Monitor) ->
+	{noreply, Monitor, hibernate}.
+
+code_change(_, Monitor, _) ->
+	{ok, Monitor}.
+
+wait_ranch_server(N) ->
+	case whereis(ranch_server) of
+		undefined when N > 0 ->
+			receive after 100 -> ok end,
+			wait_ranch_server(N - 1);
+		undefined ->
+			{error, noproc};
+		Pid ->
+			Monitor = monitor(process, Pid),
+			{ok, Monitor}
+	end.
-- 
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