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fixes #360 core should nng_aio_begin before nng_aio_finish_error
fixes #361 nng_send_aio should check for NULL message
fixes #362 nni_msgq does not signal pollable on certain events
This adds support for contexts for both sides of the surveyor pattern.
Prior to this commit, the raw mode was completely broken, and there
were numerous other bugs found and fixed. This integration includes
*much* deeper validation of this pattern.
Some changes to the core and other patterns have been made, where it
was obvioius that we could make such improvements. (The obviousness
stemming from the fact that RESPONDENT in particular is very closely
derived from REP.)
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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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This includes platform portability stuff like mutexes and threads,
etc. While here we fixed a problem with nng_opts_parse and we
addressed the type of the platform API.
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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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Actually I updated all the option related documents, and fixed minor
markup issues on several others.
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fixes #275 nng_pipe_getopt_ptr() missing?
fixes #285 nng_setopt_ptr MIS
fixes #297 nng_listener/dialer_close does not validate mode
This change adds some missing APIs, and changes others.
In particular, certain options are now of type bool, with size
of just one. This is a *breaking* change for code that uses those
options -- NNG_OPT_RAW, NNG_OPT_PAIR1_POLY, NNG_OPT_TLS_VERIFIED.
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Mostly this eliminates some cases of extra backticks.
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While here we documented that certain options are not supported in the
compatibility layer.
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fixes #279 consider restructuring man sections
This represents a rather significant rework, and major editing
effort, for the entire set of manual pages.
All of the pages now have a section number in their filename;
this assists in some other tooling, particularly ebook generation
as every link needs to be programmatically modified when combined
into an ebook.
Section 5 is introduced, and populated with pages for the main
types, and all options are now documented.
Numerous errors have been corrected, including rewriting certain
portions such as the header section of the surveyor protocol.
Much work has been done to facilitate index generation, although
certainly more work remains here.
Every internal link within these pages now resolves; there are no
more dead links. (This is required to generate Kindle format books.)
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fixes #290 sockaddr improvements
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This starts a new section 5 for generic topics, and sets up some links
for things like nng_duration and nng_socket types. There will some day
be an nng_errors(5) page as well.
Some initial work towards indexing terms for these pages is done now too.
(Indexing will mostly be useful when generating book forms of this
documentation.)
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The first problem was that using nng_sleep_aio
was found to reset the timeout, and this caused subsequent
operations to start failing with timeouts when reusing
the AIO for other operations.
The second thing is that we think it would be nicer if the
presence of real aio timeouts were still honored, so that
if the timeout is shorter than the sleep time, then we get
back an NNG_ETIMEDOUT like every other operation, and we
get back a 0 if the logical sleep operation completes
normally.
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The comments had way too much leading whitespace. While this looks fine
in PDF and HTML, it's pretty ugly on most ereaders.
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There are still some busted links that have to be fixed,
but these are the ones that are just typos or trivially
fixed. There is of course some content still missing.
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This does a few things. First it closes a case where a dropped
message could prevent subsequent connection attempts from getting through.
Second, it changes the rate at which we retry, and the timeout, to be
a lot more aggressive when attempting to establish a connection. We
retry every 500 ms, for up to 2 minutes, before giving up. This gives
a lot more resilience in the face of message loss that is typical of
ZeroTier in some environments when first establishing communication.
Third, makes the values for the connection attempts *tunable*, so
that applications can adjust for different deployment scenarios.
Fourth, it includes the ability to get the UDP socket name. This was
needed during some debug, and may be useful for a real UDP transport
later, so we're keeping it.
Finally, we added documentation for the above items.
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We only add a basic --version (also -V). I'm still trying to figure
out how to convince cmake to emit its compilation flags into a file
where we can use them for output.
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While here we also fixed a bug in the --file handling that we noticed
while writing the TLS handling.
We also fixed a warning in the core (msgqueue) for set but unused variables.
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