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This is not quite complete, but it sets the stage for other
protocols (such as zmq or mqtt) to be added to the project.
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There are a few major areas in this change.
* CMake options are now located in a common cmake/NNGOptions.cmake
file. This should make it easier for folks to figure out what
the options are, and how they are used.
* Tests are now scoped with their directory name, which should
avoid possible name collisions with test names.
* A number of tests have been either moved or incorporated into
the newer testutil/acutest framework. We are moving away from
my old c-convey framework to something easier to debug.
* We use CMake directories a bit more extensively leading to a much
cleaner CMake structure. It's not complete, but a big step in the
right direction, and a preview of future work.
* Tests are now run with verbose flags, so we get more test results
in the CI/CD logs.
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This gets near 100% coverage of the PUB/SUB protocols.
The remaining uncovered bits will need to have a mock protocol that
runs slower, so that we can inject both back pressure, and also so
that we can inject "erroroneous" messages.
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fixes #762 Pub/Sub very slow compared with nanomsg
This introduces contexts for SUB, and converts both the cooked SUB
and PUB protocols to use a new lightweight message queue that has
significant performance benefits over the heavy-weight message queue.
We've also added a test program, pubdrop, in the perf directory,
which can be used for measuring pub/sub message rates and drop rates.
Note that its quite easy to overwhelm a subscriber still.
The SUB socket performance is still not completely where it needs to be.
There are two remainging things to improve. Firsst we need to replace
the naive linked list of topics with a proper PATRICIA trie. Second, we
need to work on the low level POSIX poller code. (The Windows code is
already quite good, and we outperform nanomsg on Windows.)
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This change makes embedding nng + nggpp (or other projects depending on
nng) in cmake easier. The header files are moved to a separate include
directory. This also makes installation of the headers easier, and
allows clearer identification of private vs public heade files.
Some additional cleanups were performed by @gedamore, but the main
credit for this change belongs with @gregorburger.
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This is a significant refactor of the library configuration.
We use the modern package configuration helper, with a template
script that also does the find_package dance for any of our
dependencies.
We also have restructured the code so that most protocols and
transports have their configuration isolated to their own CMakeLists
file, reducing the size of the global CMakeLists file.
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These are incremental updates... we avoid using install() in the
subdirectories, so that we can adapt properly to them in the
single parent directory.
We have started some of the work to improve support for CPack. This
is still not yet done, but work in progress.
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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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