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This introduces enough of the HTTP API to support fully server
applications, including creation of websocket style protocols,
pluggable handlers, and so forth.
We have also introduced scatter/gather I/O (rudimentary) for
aios, and made other enhancements to the AIO framework. The
internals of the AIOs themselves are now fully private, and we
have eliminated the aio->a_addr member, with plans to remove the
pipe and possibly message members as well.
A few other minor issues were found and fixed as well.
The HTTP API includes request, response, and connection objects,
which can be used with both servers and clients. It also defines
the HTTP server and handler objects, which support server applications.
Support for client applications will require a client object to be
exposed, and that should be happening shortly.
None of this is "documented" yet, bug again, we will follow up shortly.
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It is useful to have support for validating that a peer *was*
verified, especially in the presence of optional validation.
We have added a property that does this, NNG_OPT_TLS_VERIFIED.
Further, all the old NNG_OPT_WSS_TLS_* property names have also been
renamed to generic NNG_OPT_TLS property names, which have been
moved to nng.h to facilitate reuse and sharing, with the comments
moved and corrected as well.
Finally, the man pages have been updated, with substantial
improvements to the nng_ws man page in particular.
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First, httpbin.org was having some high latency (load) earlier today,
so we needed to bump the timeout up.
Next, this also uncovered a bug where our cancellation of http channels
was a bit dodgy. This is changed to be a bit more robust, separating the
"current" active http streams (for read or write) into separate tracking
variables variables. Also, now cancellation immediately calls the aio
finish for those -- there were assumptions elsewhere (expire timeouts)
that cancellation caused nni_aio_finish() to be called.
Finally there was a use after free bug in the websocket listener code
where the listener could be freed while still having outstanding streams
waiting to send the websocket reply.
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This introduces the wss:// scheme, which is available and works like
the ws:// scheme if TLS is enabled in the library.
The library modularization is refactored somewhat, to make it easier
to use. There is now a single NNG_ENABLE_TLS that enables TLS support
under the hood.
This also adds a new option for the TLS transport, NNG_OPT_TLS_CONFIG
(and a similar one for WSS, NNG_OPT_TLS_WSS_CONFIG) that offer access
to the underlying TLS configuration object, which now has a public API
to go with it as well.
Note that it is also possible to use pure HTTPS using the *private*
API, which will be exposed in a public form soon.
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This addresses a number of problems that were found on Windows,
including one bug that actually turned up in testing on POSIX.
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This is a rather large changeset -- it fundamentally adds websocket
transport, but as part of this changeset we added a generic framework
for both HTTP and websocket. We also made some supporting changes to
the core, such as changing the way timeouts work for AIOs and adding
additional state keeping for AIOs, and adding a common framework for
deferred finalization (to avoid certain kinds of circular deadlocks
during resource cleanup). We also invented a new initialization framework
so that we can avoid wiring in knowledge about them into the master
initialization framework.
The HTTP framework is not yet complete, but it is good enough for simple
static serving and building additional services on top of -- including
websocket. We expect both websocket and HTTP support to evolve
considerably, and so these are not part of the public API yet.
Property support for the websocket transport (in particular address
properties) is still missing, as is support for TLS.
The websocket transport here is a bit more robust than the original
nanomsg implementation, as it supports multiple sockets listening at
the same port sharing the same HTTP server instance, discriminating
between them based on URI (and possibly the virtual host).
Websocket is enabled by default at present, and work to conditionalize
HTTP and websocket further (to minimize bloat) is still pending.
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