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author | Loïc Hoguin <[email protected]> | 2017-02-18 18:26:20 +0100 |
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committer | Loïc Hoguin <[email protected]> | 2017-02-18 18:26:20 +0100 |
commit | a45813c60f0f983a24ea29d491b37f0590fdd087 (patch) | |
tree | c7e741ac4a684b365e70f7ff73d0c4b6e34232a7 /src/cowboy_rest.erl | |
parent | 80f8cda7ff8fe6a575b4c2eaedd8451acf4fcef3 (diff) | |
download | cowboy-a45813c60f0f983a24ea29d491b37f0590fdd087.tar.gz cowboy-a45813c60f0f983a24ea29d491b37f0590fdd087.tar.bz2 cowboy-a45813c60f0f983a24ea29d491b37f0590fdd087.zip |
Allow passing options to sub protocols
Before this commit we had an issue where configuring a
Websocket connection was simply not possible without
doing magic, adding callbacks or extra return values.
The init/2 function only allowed setting hibernate
and timeout options.
After this commit, when switching to a different
type of handler you can either return
{module, Req, State}
or
{module, Req, State, Opts}
where Opts is any value (as far as the sub protocol
interface is concerned) and is ultimately checked
by the custom handlers.
A large protocol like Websocket would accept only
a map there, with many different options, while a
small interface like loop handlers would allow
passing hibernate and nothing else.
For Websocket, hibernate must be set from the
websocket_init/1 callback, because init/2 executes
in a separate process.
Sub protocols now have two callbacks: one with the
Opts value, one without.
The loop handler code was largely reworked and
simplified. It does not need to manage a timeout
or read from the socket anymore, it's the job of
the protocol code. A lot of unnecessary stuff was
therefore removed.
Websocket compression must now be enabled from
the handler options instead of per listener. This
means that a project can have two separate Websocket
handlers with different options. Compression is
still disabled by default, and the idle_timeout
value was changed from inifnity to 60000 (60 seconds),
as that's safer and is also a good value for mobile
devices.
Diffstat (limited to 'src/cowboy_rest.erl')
-rw-r--r-- | src/cowboy_rest.erl | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/src/cowboy_rest.erl b/src/cowboy_rest.erl index 49e1946..21d56a5 100644 --- a/src/cowboy_rest.erl +++ b/src/cowboy_rest.erl @@ -17,15 +17,14 @@ -module(cowboy_rest). -behaviour(cowboy_sub_protocol). --export([upgrade/6]). +-export([upgrade/4]). +-export([upgrade/5]). %% Common handler callbacks. -callback init(Req, any()) -> {ok | module(), Req, any()} - | {module(), Req, any(), hibernate} - | {module(), Req, any(), timeout()} - | {module(), Req, any(), timeout(), hibernate} + | {module(), Req, any(), any()} when Req::cowboy_req:req(). -callback terminate(any(), cowboy_req:req(), any()) -> ok. @@ -232,14 +231,20 @@ expires :: undefined | no_call | calendar:datetime() | binary() }). --spec upgrade(Req, Env, module(), any(), infinity, run) +-spec upgrade(Req, Env, module(), any()) -> {ok, Req, Env} when Req::cowboy_req:req(), Env::cowboy_middleware:env(). -upgrade(Req0, Env, Handler, HandlerState, infinity, run) -> +upgrade(Req0, Env, Handler, HandlerState) -> Method = cowboy_req:method(Req0), {ok, Req, Result} = service_available(Req0, #state{method=Method, handler=Handler, handler_state=HandlerState}), {ok, Req, Env#{result => Result}}. +-spec upgrade(Req, Env, module(), any(), any()) + -> {ok, Req, Env} when Req::cowboy_req:req(), Env::cowboy_middleware:env(). +%% cowboy_rest takes no options. +upgrade(Req, Env, Handler, HandlerState, _Opts) -> + upgrade(Req, Env, Handler, HandlerState). + service_available(Req, State) -> expect(Req, State, service_available, true, fun known_methods/2, 503). |