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a45813c60f
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.
22 lines
538 B
Erlang
22 lines
538 B
Erlang
%% This module implements a loop handler that reads
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%% the request body after sending itself a message,
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%% checks that its size is exactly 100000 bytes,
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%% then sends a 200 reply back.
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-module(loop_handler_body_h).
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-export([init/2]).
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-export([info/3]).
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-export([terminate/3]).
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init(Req, _) ->
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self() ! timeout,
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{cowboy_loop, Req, undefined, hibernate}.
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info(timeout, Req0, State) ->
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{ok, Body, Req} = cowboy_req:read_body(Req0),
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100000 = byte_size(Body),
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{stop, cowboy_req:reply(200, Req), State}.
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terminate(stop, _, _) ->
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ok.
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