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The get-outhash message can be sent via the get_outhash client method.
This works in a similar way to the get message but looks up a db entry
by outhash rather than by taskhash. It is intended to be used as a
read-only form of the report message.
As both handle_get_outhash and handle_report use the same query string
we can factor this out.
Signed-off-by: Paul Barker <pbarker@konsulko.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Use the new get-outhash message to perform a read-only query against an
upstream server (if present) when a reported taskhash/outhash
combination is not found in the current database. If a matching entry is
found upstream it is copied into the current database so it can be found
by future queries.
Signed-off-by: Paul Barker <pbarker@konsulko.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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The -r/--readonly argument is added to the bitbake-hashserv app. If this
argument is given then clients may only perform read operations against
the server. The read-only mode is implemented by simply not installing
handlers for write operations, this keeps the permission model simple
and reduces the risk of accidentally allowing write operations.
As a sqlite database can be safely opened by multiple processes in
parallel, it's possible to start two hashserv instances against a single
database if you wish to export both a read-only port and a read-write
port.
Signed-off-by: Paul Barker <pbarker@konsulko.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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If the server returns an empty response ("null" in json), this cannot
be iterated to check for the presence of the "chunk-stream" key.
Signed-off-by: Paul Barker <pbarker@konsulko.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Fixes the bug were long paths would break Unix domain socket clients
(for real this time; the previous attempt was missing os.path.basename).
Adds some tests to prevent regressions
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Restores a fix for unix domain socket path length limits when using the
synchronous hash equivalence client that was accidentally removed when
the async client was added.
Unfortunately, it's much more difficult to fix the same problem when
using the async client directly due to the interaction of chdir() and
async code, but this will at least restore the old behavior in the
synchronous case.
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Adds support for an upstream server to be specified. The upstream server
will be queried for equivalent hashes whenever a miss is found in the
local server. If the server returns a match, it is merged into the
local database. In order to keep the get stream queries as fast as
possible since they are the critical path when bitbake is preparing the
run queue, missing tasks provided by the server are not immediately
pulled from the upstream server, but instead are put into a queue to be
backfilled by a worker task later.
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Adds support for create a client that operates using Python asynchronous
I/O.
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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From: Anatol Belski <anbelski@linux.microsoft.com>
Using localhost for direct builds on host is fine. A case with a
misbehavior has been sighted on a Docker build. Even when the host
supports IPv6, but Docker is not configured correspondingly - some
versions of the asyncio Python module seem to misbehave and try to
use IPv6 where it's not supported in the container. This happens at
least on some Ubuntu 18.04 based containers, resolving the IP
explicitly appears to be the fix.
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Correctly import, and inherit functions, and variables.
Also fix some typos and remove some Python 2 code that isn't recognised.
Signed-off-by: Frazer Clews <frazerleslieclews@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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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.
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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removed unused imports which made the code harder to read, and slightly
but less efficient
Signed-off-by: Frazer Clews <frazer.clews@codethink.co.uk>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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The reason for this should be recorded in the commit logs. Imagine
you have a target recipe (e.g. meta-extsdk-toolchain) which depends on
gdb-cross. sstate in OE-Core allows gdb-cross to have the same hash
regardless of whether its built on x86 or arm. The outhash will be
different.
We need hashequiv to be able to adapt to the prescence of sstate artefacts
for meta-extsdk-toolchain and allow the hashes to re-intersect, rather than
trying to force a rebuild of meta-extsdk-toolchain. By this point in the build,
it would have already been installed from sstate so the build needs to adapt.
Equivalent hashes should be reported to the server as a taskhash that
needs to map to an specific unihash. This patch adds API to the hashserv
client/server to allow this.
[Thanks to Joshua Watt for help with this patch]
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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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]
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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The os module is required to connect to a unix domain socket
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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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.
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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This can cause a huge backlog of closing sockets on the server and
in our case we don't really want/need the protection TCP is trying to
give us so work around it.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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At exit the hashserv code was causing tracebacks as join() wasn't
being called from the thread that started the process. Ensure that
the hashserver is started from the pre_serve hook which is the
final thread the cooker runs in. This avoids the traceback at the
expense of some horrific poking into data stores which will ultimately
need improving through a proper API.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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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.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Experience with the prserv shows that having two threads, one accepting
and queueing connections and one handling the requests leads to much
more reliable behaviour than having everything in a single thread.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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We're seeing performance problems with hashserv running on a normal build
system. The cause seems to be the large amounts of file IO that builds involve
blocking writes to the database. Since sqlite blocks on the sync calls, this
causes a significant problem.
Since if we lose power we have bigger problems, run with synchronous=off
to avoid locking and put the jounral into memory to avoid any write issues
there too.
This took writes from 120s down to negligible in my tests, which means
hashserv then responds promptly to requests.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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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.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Implements a number of optimizations to the SQL used in the hash
equivalence server:
1) Two indexes are created for the two methods (method, taskhash and
method outhash) by which rows are found in order to speed up the
lookup
2) An extra SELECT to lookup the just inserted row was removed. This
SELECT is unnecessary since all of the information about the newly
inserted row is already available.
3) A uniqueness constraint was added to the table. This should allow
the server to be multithreaded in the future since duplicate inserts
can be detected (and ignored). This change requires bumping the
database version to '2', since a uniqueness constraint can't be
added to an existing table.
4) Some comments are added to clarify the trick SELECT statement used
when inserting new equivalent hashes
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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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.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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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.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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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]
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Paul Barker
Joshua Watt
Anatol Belski
Frazer Clews
Frazer Clews
Richard Purdie