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Add {switch_handler, Module} return value to cowboy_rest

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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.
This commit is contained in:
Loïc Hoguin 2017-11-01 16:27:26 +00:00
parent 5e88a9b394
commit 836342abb8
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GPG key ID: 8A9DF795F6FED764
5 changed files with 191 additions and 11 deletions
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70
test/rest_handler_SUITE.erl Normal file
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%% Copyright (c) 2017, Loïc Hoguin <essen@ninenines.eu>
%%
%% 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(rest_handler_SUITE).
-compile(export_all).
-import(ct_helper, [config/2]).
-import(ct_helper, [doc/1]).
-import(cowboy_test, [gun_open/1]).
%% ct.
all() ->
cowboy_test:common_all().
groups() ->
cowboy_test:common_groups(ct_helper:all(?MODULE)).
init_per_group(Name, Config) ->
cowboy_test:init_common_groups(Name, Config, ?MODULE).
end_per_group(Name, _) ->
cowboy:stop_listener(Name).
%% Dispatch configuration.
init_dispatch(_) ->
cowboy_router:compile([{'_', [
{"/switch_handler", switch_handler_h, run},
{"/switch_handler_opts", switch_handler_h, hibernate}
]}]).
%% Internal.
do_decode(Headers, Body) ->
case lists:keyfind(<<"content-encoding">>, 1, Headers) of
{_, <<"gzip">>} -> zlib:gunzip(Body);
_ -> Body
end.
%% Tests.
switch_handler(Config) ->
doc("Switch REST to loop handler for streaming the response body."),
ConnPid = gun_open(Config),
Ref = gun:get(ConnPid, "/switch_handler", [{<<"accept-encoding">>, <<"gzip">>}]),
{response, nofin, 200, Headers} = gun:await(ConnPid, Ref),
{ok, Body} = gun:await_body(ConnPid, Ref),
<<"Hello\nstreamed\nworld!\n">> = do_decode(Headers, Body),
ok.
switch_handler_opts(Config) ->
doc("Switch REST to loop handler for streaming the response body; with options."),
ConnPid = gun_open(Config),
Ref = gun:get(ConnPid, "/switch_handler_opts", [{<<"accept-encoding">>, <<"gzip">>}]),
{response, nofin, 200, Headers} = gun:await(ConnPid, Ref),
{ok, Body} = gun:await_body(ConnPid, Ref),
<<"Hello\nstreamed\nworld!\n">> = do_decode(Headers, Body),
ok.