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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.
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One had the todo text fixed, another had the task to do done.
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Also finish implementing the relevant test, getting rid of todos.
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A bit late but at least removes a todo.
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... instead of hard-coding "make".
First, we check the value of `$MAKE`. If it's unset, we look for `gmake`
in the `$PATH`. If it's missing, we assume it's `make`.
This fixes the testsuite where GNU Make is installed as `gmake`.
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If cowboy_static is initialized with `{priv_file, ...}` or `{priv_dir,
...}`, it is now able to read files from Erlang application .ez
archives.
When serving a file from an archive, the #file_info{} comes from the
archive, not the contained file, except for the size and type. The
erl_prim_loader module is used to read the latter's #file_info{} and the
actual file content (ie. sendfile(2) is not used in this case).
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Currently marked as experimental because it can't be tweaked
(just enabled/disabled) and because it is not documented yet.
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This would prevent the client from knowing whether the request
was received fully without the connection closing first.
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The {data, IsFin, Data} uses IsFin to indicate whether this
is the last chunk, while chunked transfer-encoding uses the
length of Data, and ends when it is 0. We must therefore not
send chunks with empty data.
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The stream handlers can be specified using the protocol
option 'stream_handlers'. It defaults to [cowboy_stream_h].
The cowboy_stream_h module currently does not forward the
calls to further stream handlers. It feels like an edge
case; usually we'd want to put our own handlers between
the protocol code and the request process. I am therefore
going to focus on other things for now.
The various types and specifications for stream handlers
have been updated and the cowboy_stream module can now
be safely used as a behavior. The interface might change
a little more, though.
This commit does not include tests or documentation.
They will follow separately.
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Putting them in the correct test suite, with the proper
documentation etc.
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This commit changes Cowboy to follow RFC6585.
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The only ROADMAP now is small fixes toward making it stable
and very little interface changes, so the file is not that
useful anymore.
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Information can be found in cgit.
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In particular the cowboy_sub_protocol is subject to change soon.
Also the cowboy_stream behavior is going to be left hidden in
this release and enabled when it becomes easier to chain them.
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Also fixes a small mistake in cowboy_websocket.
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The changelog had a wrong reference to an option that was updated.
`max_header_request_line_length` -> `max_request_line_length`
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Updates and replaces the cowboy_protocol manual.
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