| Commit message (Collapse) | Author | Age |
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This changeset needs work. We are seeing errors described by
This reverts commit d7f7c896c0ede24249ef63b1e45b1878bf4bd473.
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fixes #208 pipe start should occur before connect / accept
fixes #616 Race condition closing between header & body
This refactors the transports to handle their own connection
handshaking before passing the pipe to the socket. This
changes and simplifies the setup. This also fixes a rather
challenging race condition described by #616.
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fixes #170 Make more use of reaper
This is a complete restructure/rethink of how child objects interact
with the socket. (This also backs out #576 as it turns out not to be
needed.) While 568 says reader/writer lock, for now we have settled
for a single writer lock. Its likely that this is sufficient.
Essentially we use the single socket lock to guard lists of the socket
children. We also use deferred deletion in the idhash to facilitate
teardown, which means endpoint closes are no longer synchronous.
We use the reaper to clean up objects when the reference count drops
to zero. We make a special exception for pipes, since they really
are not reference counted by their parents, and they are leaf objects
anyway.
We believe this addresses the main outstanding race conditions in
a much more correct and holistic way.
Note that endpoint shutdown is a little tricky, as it makes use of
atomic flags to guard against double entry, and against recursive
lock entry. This is something that would be nice to make a bit more
obvious, but what we have is safe, and the complexity is at least
confined to one place.
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fixes #573 atomic flags could help
This introduces a new atomic flag, and reduces some of the global
locking. The lock refactoring work is not yet complete, but this is
a positive step forward, and should help with certain things.
While here we also fixed a compile warning due to incorrect types.
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fixes #565 Option getting should validate sizes more aggressively
fixes #563 Reconnect timeouts should be settable on dialers
fixes #562 pipe test is fragile
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This separates the plumbing for endpoints into distinct
dialer and listeners. Some of the transports could benefit
from further separation, but we've done some rather larger
separation e.g. for the websocket transport.
IPC would be a good one to update later, when we start looking
at exposing a more natural underlying API.
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fixes #538 setopt should have an explicit chkopt routine
fixes #537 Internal TCP API needs better name separation
fixes #524 Option types should be "typed"
This is a rework of the option management code, to make it both clearer
and to prepare for further work to break up endpoints. This reduces
a certain amount of dead or redundant code, and actually saves cycles
when setting options, as some loops were not terminated that should have
been.
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fixes #468 TCP nodelay and keepalive should start usable
fixes #467 NN_RCVMAXSZ option does not work (compat)
fixes #465 Support NN_OPT_TCPNODELAY (compat)
This is a rather larger change set than I'd like, but when adding
support for legacy TCP keepalive, I found a number if issues using
the legacy TCP test (which we are introducing with this commit.)
This fixes the concerns that are relevant and addressible.
We have elected not to try to support to local address binding at this
time, and the IPv6 test case in the old code was wrong, so changes
relevant to that are commented out.
I've also updated the nng_compat manual page to reflect additional
caveats that folks should be aware of, including the previously
undocumented caveat around the NN_SNDBUF and NN_RCVBUF options.
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This changes the signature of nng_pipe_notify(), and the associated
events. The documentation is updated to reflect this.
We have also broken the lock up so that we don't hold the master
socket lock for some of these things, which may have beneficial
impact on performance.
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* fixes #419 want to nni_aio_stop without blocking
This actually introduces an nni_aio_close() API that causes
nni_aio_begin to return NNG_ECLOSED, while scheduling a callback
on the AIO to do an NNG_ECLOSED as well. This should be called
in non-blocking close() contexts instead of nni_aio_stop(), and
the cases where we call nni_aio_fini() multiple times are updated
updated to add nni_aio_stop() calls on all "interlinked" aios before
finalizing them.
Furthermore, we call nni_aio_close() as soon as practical in the
close path. This closes an annoying race condition where the
callback from a lower subsystem could wind up rescheduling an
operation that we wanted to abort.
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This adds a new pipe event notification API (callbacks called
on either pipe add or remove), including both tests and docs.
Also supporting APIs to get the socket or endpoint associated
with a pipe are included (tested and documented as well.)
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This includes the test from legacy libnanomsg and a man page.
We have refactored the message queue notification system so
that it uses nni_pollable, leading we hope to a more consistent
system, and reducing the code size and complexity.
We also fixed the size of the NN_RCVFD and NN_SNDFD so that they
are a SOCKET on Windows systems, rather than an integer. This
addresses 64-bit compilation problems.
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Ultimately, this just removes the support for lingering altogether.
Based on prior experience, lingering has always been unreliable, and
was removed in legacy libnanomsg ages ago.
The problem is that operating system support for lingering is very
inconsistent at best, and for some transports the very concept is somewhat
meaningless.
Making things worse, we were never able to adequately capture an exit()
event from another thread -- so lingering was always a false promise.
Applications that need to be sure that messages are delivered should
either include an ack in their protocol, use req/rep (which has an ack),
or inject a suitable delay of their own.
For things going over local networks, an extra delay of 100 msec should
be sufficient *most of the time*.
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This provides context support for REQ and REP sockets.
More discussion around this is in the issue itself.
Optionally we would like to extend this to the surveyor pattern.
Note that we specifically do not support pollable descriptors
for non-default contexts, and the results of using file descriptors
for polling (NNG_OPT_SENDFD and NNG_OPT_RECVFD) is undefined.
In the future, it might be nice to figure out how to factor in
optional use of a message queue for users who want more buffering,
but we think there is little need for this with cooked mode.
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This makes the raw mode something that is immutable, determined
at socket construction. This is an enabling change for the
separate context support coming soon.
As a result, this is an API breaking change for users of the raw
mode option (NNG_OPT_RAW). There aren't many of them out there.
Cooked mode is entirely unaffected.
There are changes to tests and documentation included.
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fixes #302 nng_dialer/listener/pipe_getopt_sockaddr desired
This adds plumbing to pass and check the type of options
all the way through.
NNG_ZT_OPT_ORBIT is type UINT64, but you can use the untyped form to
pass two of them if needed.
No typed access for retrieving strings yet. I think this should allocate
a pointer and copy that out, but that's for later.
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While here we documented that certain options are not supported in the
compatibility layer.
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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 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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This makes all the protocols and transports optional. All
of them except ZeroTier are enabled by default, but you can
now disable them (remove from the build) with cmake options.
The test suite is modified so that tests still run as much
as they can, but skip over things caused by missing functionality
from the library (due to configuration).
Further, the constant definitions and prototypes for functions
that are specific to transports or protocols are moved into
appropriate headers, which should be included directly by
applications wishing to use these.
We have also added and improved documentation -- all of the
transports are documented, and several more man pages for
protocols have been added. (Req/Rep and Surveyor are still
missing.)
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This eliminates the separate threads used for devices, letting them
benefit from the new aio framework. It also eliminates the legacy
nni_sock_sendmsg and nni_sock_recvmsg internal APIs.
It would appear that there is an opportunity here to provide asynchronous
device support out to userland as well, exposing an aio to them. That
work is deferred to later.
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While here we added a test for the aio stuff, and cleaned up some dead
code for the old fd notifications. There were a few improvements to
shorten & clean code elsewhere, such as short-circuiting task wait
when the task has no callback.
The legacy sendmsg() and recvmsg() APIs are still in the socket core
until we convert the device code to use the aios.
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This eliminates the "quasi-functional" notify API altogether.
The aio framework will be coming soon to replace it.
As a bonus, apps (legacy apps) that use the notification FDs
will see improved performance, since we don't have to context
switch to give them a notification.
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There is now a public nng_duration type. We have also updated the
zerotier work to work with the signed int64_t's that the latst ZeroTier
dev branch is using.
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The NNG_OPT_SOCKNAME option is settable, to a limit of 64 bytes.
The NNG_OPT_DOMAIN is read-only, but changes to match the setting
of the NNG_OPT_RAW field. New applications should not use the
NNG_OPT_DOMAIN option -- it is provided solely for use with the
legacy NN_DOMAIN option in the compatibility layer.
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This makes the APIs use string keys, and largely eliminates the use of
integer option IDs altogether. The underlying registration for options
is also now a bit richer, letting protcols and transports declare the
actual options they use, rather than calling down into each entry point
carte blanche and relying on ENOTSUP.
This code may not be as fast as the integers was, but it is more intuitive,
easier to extend, and is not on any hot code paths. (If you're diddling
options on a hot code path you're doing something wrong.)
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We allocate AIO structures dynamically, so that we can use them
abstractly in more places without inlining them. This will be used
for the ZeroTier transport to allow us to create operations consisting
of just the AIO. Furthermore, we provide accessors for some of the
aio members, in the hopes that we will be able to wrap these for
"safe" version of the AIO capability to export to applications, and
to protocol and transport implementors.
While here we cleaned up the protocol details to use consistently
shorter names (no nni_ prefix for static symbols needed), and we
also fixed a bug in the surveyor code.
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This eliminates all the old #define's or enum values, making all
option IDs now totally dynamic, and providing well-known string
values for well-behaved applications.
We have added tests of some of these options, including lookups, and
so forth. We have also fixed a few problems; including at least
one crasher bug when the timeouts on reconnect were zero.
Protocol specific options are now handled in the protocol. We will
be moving the initialization for a few of those well known entities
to the protocol startup code, following the PAIRv1 pattern, later.
Applications must therefore not depend on the value of the integer IDs,
at least until the application has opened a socket of the appropriate
type.
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We intend to use this with transports where dynamic "port numbers"
might be 32-bits. This would allow us to formulate a 64-bit number
representing a conversation, and be able to find that conversation
by the 64-bit value.
Note that the hashed values are probably not perfectly optimal, as
only the low order bits are particularly significant in the hash.
We might want to consider XOR'ing in the upper bits to address that.
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This supports creating listeners and dialers, managing options
on them (though only a few options are supported at present),
starting them and closing them, all independently.
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If the underlying platform fails (FreeBSD is the only one I'm aware
of that does this!), we use a global lock or condition variable instead.
This means that our lock initializers never ever fail.
Probably we could eliminate most of this for Linux and Darwin, since
on those platforms, mutex and condvar initialization reasonably never
fails. Initial benchmarks show little difference either way -- so we
can revisit (optimize) later.
This removes a lot of otherwise untested code in error cases and so forth,
improving coverage and resilience in the face of allocation failures.
Platforms other than POSIX should follow a similar pattern if they need
this. (VxWorks, I'm thinking of you.) Most sane platforms won't have
an issue here, since normally these initializations do not need to allocate
memory. (Reportedly, even FreeBSD has plans to "fix" this in libthr2.)
While here, some bugs were fixed in initialization & teardown.
The fallback code is properly tested with dedicated test cases.
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We enable a few flags, but now the details of the socket internals
are completely private to the socket.
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fixes #66 Make pipe and endpoint structures private
This changes a number of things, refactoring endpoints and supporting
code to keep their internals private, and making endpoint close
synchronous. This will allow us to add a consumer facing API for
nng_ep_close(), as well as property APIs, etc.
While here a bunch of convoluted and dead code was cleaned up.
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This fixes one major problem, which was that if nni_fini() was called
once on Windows, it would not be further possible to call nni_init().
While here fixed a few compilation issues.
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