The hash equivalence client and server can occasionally send messages
that are too large for the server to fit in the receive buffer (64 KB).
To prevent this, support is added to the protocol to "chunkify" the
stream and break it up into manageable pieces that the server can each
side can back together.
Ideally, this would be negotiated by the client and server, but it's
currently hard coded to 32 KB to prevent the round-trip delay.
(Bitbake rev: 1a7bddb5471a02a744e7a441a3b4a6da693348b0)
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit e27a28c1e40e886ee68ba4b99b537ffc9c3577d4)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
The hash server process is terminated and waited on with join(), so it
should not be a daemon. Daemonizing it cause races with the server
cleanup, especially in the selftest because the process may not have
terminated and cleanup up its socket before the test cleanup runs and
tries to do it.
[YOCTO #13542]
(Bitbake rev: 7c829675581818f92d57056b57fbd3880829b6bd)
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Reworks the hash equivalence server to address performance issues that
were encountered with the REST mechanism used previously, particularly
during the heavy request load encountered during signature generation.
Notable changes are:
1) The server protocol is no longer HTTP based. Instead, it uses a
simpler JSON over a streaming protocol link. This protocol has much
lower overhead than HTTP since it eliminates the HTTP headers.
2) The hash equivalence server can either bind to a TCP port, or a Unix
domain socket. Unix domain sockets are more efficient for local
communication, and so are preferred if the user enables hash
equivalence only for the local build. The arguments to the
'bitbake-hashserve' command have been updated accordingly.
3) The value to which BB_HASHSERVE should be set to enable a local hash
equivalence server is changed to "auto" instead of "localhost:0". The
latter didn't make sense when the local server was using a Unix
domain socket.
4) Clients are expected to keep a persistent connection to the server
instead of creating a new connection each time a request is made for
optimal performance.
5) Most of the client logic has been moved to the hashserve module in
bitbake. This makes it easier to share the client code.
6) A new bitbake command has been added called 'bitbake-hashclient'.
This command can be used to query a hash equivalence server, including
fetching the statistics and running a performance stress test.
7) The table indexes in the SQLite database have been updated to
optimize hash lookups. This change is backward compatible, as the
database will delete the old indexes first if they exist.
8) The server has been reworked to use python async to maximize
performance with persistently connected clients. This requires Python
3.5 or later.
(Bitbake rev: 2124eec3a5830afe8e07ffb6f2a0df6a417ac973)
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
There were hard to debug lockups when trying to use threading to start
hashserv as a thread. Switch to multiprocessing which doesn't show the
same locking problems.
(Bitbake rev: be23d887c8e244f1ef961298fbc9214d0fd0968a)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Its useful, particularly in the local developer model of usage, for
bitbake to start and stop a hash equivalence server on local port,
rather than relying on one being started by the user before the build.
The new BB_HASHSERVE variable supports this.
The database handling is moved internally into the hashserv code so that
different threads/processes can be used for the server without errors.
(Bitbake rev: a4fa8f1bd88995ae60e10430316fbed63d478587)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
With the introduction of SPDX-License-Identifier headers, we don't need a ton
of header boilerplate in every file. Simplify the files and rely on the top
level for the full licence text.
(Bitbake rev: 695d84397b68cc003186e22f395caa378b06bc75)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This adds the SPDX-License-Identifier license headers to the majority of
our source files to make it clearer exactly which license files are under.
The bulk of the files are under GPL v2.0 with one found to be under V2.0
or later, some under MIT and some have dual license. There are some files
which are potentially harder to classify where we've imported upstream code
and those can be handled specifically in later commits.
The COPYING file is replaced with LICENSE.X files which contain the full
license texts.
(Bitbake rev: ff237c33337f4da2ca06c3a2c49699bc26608a6b)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Implements a reference implementation of the hash equivalence server.
This server has minimal dependencies (and no dependencies outside of the
standard Python library), and implements the minimum required to be a
conforming hash equivalence server.
[YOCTO #13030]
(Bitbake rev: 1bb2ad0b44b94ee04870bf3f7dac4e663bed6e4d)
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
