From 836342abb86b3ff15d1c8319a455d776f7027a87 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lo=C3=AFc=20Hoguin?= <essen@ninenines.eu>
Date: Wed, 1 Nov 2017 16:27:26 +0000
Subject: Add {switch_handler, Module} return value to cowboy_rest

Also {switch_handler, Module, Opts}.

Allows switching to a different handler type. This is
particularly useful for processing most of the request
with cowboy_rest and then streaming the response body
using cowboy_loop.
---
 test/handlers/switch_handler_h.erl | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 test/handlers/switch_handler_h.erl

(limited to 'test/handlers')

diff --git a/test/handlers/switch_handler_h.erl b/test/handlers/switch_handler_h.erl
new file mode 100644
index 0000000..f1580d1
--- /dev/null
+++ b/test/handlers/switch_handler_h.erl
@@ -0,0 +1,36 @@
+-module(switch_handler_h).
+
+-export([init/2]).
+-export([content_types_provided/2]).
+-export([provide/2]).
+-export([info/3]).
+
+init(Req, State) ->
+	{cowboy_rest, Req, State}.
+
+content_types_provided(Req, State) ->
+	{[{<<"text/plain">>, provide}], Req, State}.
+
+provide(Req0, run) ->
+	Req = cowboy_req:stream_reply(200, Req0),
+	send_after(0),
+	{{switch_handler, cowboy_loop}, Req, 0};
+provide(Req0, hibernate) ->
+	Req = cowboy_req:stream_reply(200, Req0),
+	send_after(0),
+	{{switch_handler, cowboy_loop, hibernate}, Req, 0}.
+
+send_after(N) ->
+	erlang:send_after(100, self(), {stream, msg(N)}).
+
+msg(0) -> <<"Hello\n">>;
+msg(1) -> <<"streamed\n">>;
+msg(2) -> <<"world!\n">>;
+msg(3) -> stop.
+
+info({stream, stop}, Req, State) ->
+	{stop, Req, State};
+info({stream, What}, Req, State) ->
+	cowboy_req:stream_body(What, nofin, Req),
+	send_after(State + 1),
+	{ok, Req, State + 1}.
-- 
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