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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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This eliminates a bunch of redundant URL parsing, using the common
URL logic we already have in place.
While here I fixed a problem with the TLS and WSS test suites that
was failing on older Ubuntu -- apparently older versions of mbedTLS
were unhappy if selecting OPTIONAL verification without a validate
certificate chain.
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This changes the backend (internal) HTTP API to provide a much more
sensible handler scheme, where the handlers are opaque objects and we
can allocate a handler for different types of tasks.
We've also added support serving up directories of static content, and
added code to validate that the directory serving is working as intended.
This is a key enabling step towards the public API.
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This adds support for configuration of TLS websockets using the files
for keys, certificates, and CRLs. Significant changes to the websocket,
TLS, and HTTP layers were made here. We now expect TLS configuration to
be tied to the HTTP layer, and the HTTP code creates default configuration
objects based on the URL supplied. (HTTP dialers and listeners are now
created with a URL rather than a sockaddr, giving them access to the scheme
as well.)
We fixed several bugs affecting TLS validation, and added a test suite
that confirms that validation works as it should. We also fixed an orphaned
socket during HTTP negotiation, responsible for an occasional assertion
error if the http handshake does not complete successfully. Finally several
use-after-free races were closed.
TLS layer changes include reporting of handshake failures using newly
created "standard" error codes for peer authentication and cryptographic
failures.
The use of the '*' wild card in URLs at bind time is no longer supported
for websocket at least.
Documentation updates for all this are in place as well.
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This also fixes a use-after-free bug in the HTTP framework, where the
handler could be deleted why callbacks were still using it. (We now
reference count the handlers.)
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This fixes a problem where the websocket would only send one message,
then no others, due to not clearing the "frame" busy flag on completion
of the frame transmit.
We have also added a test that tries to send 10 messages back and
forth to make sure that we catch this kind of problem in the future.
Finally we've fixed some problems that were found when testing edge
cases around the protocol, which were responsible for invalid memory
accesses.
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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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