wireprotov2: define and implement "filesdata" command
Previously, the only way to access file revision data was the
"filedata" command. This command is useful to have. But, it only
allowed resolving revision data for a single file. This meant that
clients needed to send 1 command for each tracked path they were
seeking data on. Furthermore, those commands would need to enumerate
the exact file nodes they wanted data for.
This approach meant that clients were sending a lot of data to
remotes in order to request file data. e.g. if there were 1M
file revisions, we'd need at least 20,000,000 bytes just to encode
file nodes! Many clients on the internet don't have that kind of
upload capacity.
In order to limit the amount of data that clients must send, we'll
need more efficient ways to request repository data.
This commit defines and implements a new "filesdata" command. This
command allows the retrieval of data for multiple files by specifying
changeset revisions and optional file patterns. The command figures
out what file revisions are "relevant" and sends them in bulk.
The logic around choosing which file revisions to send in the case of
haveparents not being set is overly simple and will over-send files. We
will need more smarts here eventually. (Specifically, the client will
need to tell the server which revisions it knows about.) This work
is deferred until a later time.
Differential Revision: https://phab.mercurial-scm.org/D4981
$ . $TESTDIR/wireprotohelpers.sh
$ cat >> $HGRCPATH << EOF
> [extensions]
> blackbox =
> [blackbox]
> track = simplecache
> EOF
$ hg init server
$ enablehttpv2 server
$ cd server
$ cat >> .hg/hgrc << EOF
> [extensions]
> simplecache = $TESTDIR/wireprotosimplecache.py
> EOF
$ echo a0 > a
$ echo b0 > b
$ hg -q commit -A -m 'commit 0'
$ echo a1 > a
$ hg commit -m 'commit 1'
$ echo b1 > b
$ hg commit -m 'commit 2'
$ echo a2 > a
$ echo b2 > b
$ hg commit -m 'commit 3'
$ hg log -G -T '{rev}:{node} {desc}'
@ 3:50590a86f3ff5d1e9a1624a7a6957884565cc8e8 commit 3
|
o 2:4d01eda50c6ac5f7e89cbe1880143a32f559c302 commit 2
|
o 1:4432d83626e8a98655f062ec1f2a43b07f7fbbb0 commit 1
|
o 0:3390ef850073fbc2f0dfff2244342c8e9229013a commit 0
$ hg --debug debugindex -m
rev linkrev nodeid p1 p2
0 0 992f4779029a3df8d0666d00bb924f69634e2641 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000
1 1 a988fb43583e871d1ed5750ee074c6d840bbbfc8 992f4779029a3df8d0666d00bb924f69634e2641 0000000000000000000000000000000000000000
2 2 a8853dafacfca6fc807055a660d8b835141a3bb4 a988fb43583e871d1ed5750ee074c6d840bbbfc8 0000000000000000000000000000000000000000
3 3 3fe11dfbb13645782b0addafbe75a87c210ffddc a8853dafacfca6fc807055a660d8b835141a3bb4 0000000000000000000000000000000000000000
$ hg serve -p $HGPORT -d --pid-file hg.pid -E error.log
$ cat hg.pid > $DAEMON_PIDS
Performing the same request should result in same result, with 2nd response
coming from cache.
$ sendhttpv2peer << EOF
> command manifestdata
> nodes eval:[b'\x99\x2f\x47\x79\x02\x9a\x3d\xf8\xd0\x66\x6d\x00\xbb\x92\x4f\x69\x63\x4e\x26\x41']
> tree eval:b''
> fields eval:[b'parents']
> EOF
creating http peer for wire protocol version 2
sending manifestdata command
response: gen[
{
b'totalitems': 1
},
{
b'node': b'\x99/Gy\x02\x9a=\xf8\xd0fm\x00\xbb\x92OicN&A',
b'parents': [
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
]
}
]
$ sendhttpv2peer << EOF
> command manifestdata
> nodes eval:[b'\x99\x2f\x47\x79\x02\x9a\x3d\xf8\xd0\x66\x6d\x00\xbb\x92\x4f\x69\x63\x4e\x26\x41']
> tree eval:b''
> fields eval:[b'parents']
> EOF
creating http peer for wire protocol version 2
sending manifestdata command
response: gen[
{
b'totalitems': 1
},
{
b'node': b'\x99/Gy\x02\x9a=\xf8\xd0fm\x00\xbb\x92OicN&A',
b'parents': [
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
]
}
]
Sending different request doesn't yield cache hit.
$ sendhttpv2peer << EOF
> command manifestdata
> nodes eval:[b'\x99\x2f\x47\x79\x02\x9a\x3d\xf8\xd0\x66\x6d\x00\xbb\x92\x4f\x69\x63\x4e\x26\x41', b'\xa9\x88\xfb\x43\x58\x3e\x87\x1d\x1e\xd5\x75\x0e\xe0\x74\xc6\xd8\x40\xbb\xbf\xc8']
> tree eval:b''
> fields eval:[b'parents']
> EOF
creating http peer for wire protocol version 2
sending manifestdata command
response: gen[
{
b'totalitems': 2
},
{
b'node': b'\x99/Gy\x02\x9a=\xf8\xd0fm\x00\xbb\x92OicN&A',
b'parents': [
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
]
},
{
b'node': b'\xa9\x88\xfbCX>\x87\x1d\x1e\xd5u\x0e\xe0t\xc6\xd8@\xbb\xbf\xc8',
b'parents': [
b'\x99/Gy\x02\x9a=\xf8\xd0fm\x00\xbb\x92OicN&A',
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
]
}
]
$ cat .hg/blackbox.log
*> cacher constructed for manifestdata (glob)
*> cache miss for 47abb8efa5f01b8964d74917793ad2464db0fa2c (glob)
*> storing cache entry for 47abb8efa5f01b8964d74917793ad2464db0fa2c (glob)
*> cacher constructed for manifestdata (glob)
*> cache hit for 47abb8efa5f01b8964d74917793ad2464db0fa2c (glob)
*> cacher constructed for manifestdata (glob)
*> cache miss for 37326a83e9843f15161fce9d1e92d06b795d5e8e (glob)
*> storing cache entry for 37326a83e9843f15161fce9d1e92d06b795d5e8e (glob)
$ cat error.log
$ killdaemons.py
$ rm .hg/blackbox.log
Try with object caching mode
$ cat >> .hg/hgrc << EOF
> [simplecache]
> cacheobjects = true
> EOF
$ hg serve -p $HGPORT -d --pid-file hg.pid -E error.log
$ cat hg.pid > $DAEMON_PIDS
$ sendhttpv2peer << EOF
> command manifestdata
> nodes eval:[b'\x99\x2f\x47\x79\x02\x9a\x3d\xf8\xd0\x66\x6d\x00\xbb\x92\x4f\x69\x63\x4e\x26\x41']
> tree eval:b''
> fields eval:[b'parents']
> EOF
creating http peer for wire protocol version 2
sending manifestdata command
response: gen[
{
b'totalitems': 1
},
{
b'node': b'\x99/Gy\x02\x9a=\xf8\xd0fm\x00\xbb\x92OicN&A',
b'parents': [
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
]
}
]
$ sendhttpv2peer << EOF
> command manifestdata
> nodes eval:[b'\x99\x2f\x47\x79\x02\x9a\x3d\xf8\xd0\x66\x6d\x00\xbb\x92\x4f\x69\x63\x4e\x26\x41']
> tree eval:b''
> fields eval:[b'parents']
> EOF
creating http peer for wire protocol version 2
sending manifestdata command
response: gen[
{
b'totalitems': 1
},
{
b'node': b'\x99/Gy\x02\x9a=\xf8\xd0fm\x00\xbb\x92OicN&A',
b'parents': [
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
]
}
]
$ cat .hg/blackbox.log
*> cacher constructed for manifestdata (glob)
*> cache miss for 47abb8efa5f01b8964d74917793ad2464db0fa2c (glob)
*> storing cache entry for 47abb8efa5f01b8964d74917793ad2464db0fa2c (glob)
*> cacher constructed for manifestdata (glob)
*> cache hit for 47abb8efa5f01b8964d74917793ad2464db0fa2c (glob)
$ cat error.log
$ killdaemons.py
$ rm .hg/blackbox.log
A non-cacheable command does not instantiate cacher
$ hg serve -p $HGPORT -d --pid-file hg.pid -E error.log
$ cat hg.pid > $DAEMON_PIDS
$ sendhttpv2peer << EOF
> command capabilities
> EOF
creating http peer for wire protocol version 2
sending capabilities command
response: gen[
{
b'commands': {
b'branchmap': {
b'args': {},
b'permissions': [
b'pull'
]
},
b'capabilities': {
b'args': {},
b'permissions': [
b'pull'
]
},
b'changesetdata': {
b'args': {
b'fields': {
b'default': set([]),
b'required': False,
b'type': b'set',
b'validvalues': set([
b'bookmarks',
b'parents',
b'phase',
b'revision'
])
},
b'revisions': {
b'required': True,
b'type': b'list'
}
},
b'permissions': [
b'pull'
]
},
b'filedata': {
b'args': {
b'fields': {
b'default': set([]),
b'required': False,
b'type': b'set',
b'validvalues': set([
b'parents',
b'revision'
])
},
b'haveparents': {
b'default': False,
b'required': False,
b'type': b'bool'
},
b'nodes': {
b'required': True,
b'type': b'list'
},
b'path': {
b'required': True,
b'type': b'bytes'
}
},
b'permissions': [
b'pull'
]
},
b'filesdata': {
b'args': {
b'fields': {
b'default': set([]),
b'required': False,
b'type': b'set',
b'validvalues': set([
b'firstchangeset',
b'parents',
b'revision'
])
},
b'haveparents': {
b'default': False,
b'required': False,
b'type': b'bool'
},
b'pathfilter': {
b'default': None,
b'required': False,
b'type': b'dict'
},
b'revisions': {
b'required': True,
b'type': b'list'
}
},
b'permissions': [
b'pull'
],
b'recommendedbatchsize': 50000
},
b'heads': {
b'args': {
b'publiconly': {
b'default': False,
b'required': False,
b'type': b'bool'
}
},
b'permissions': [
b'pull'
]
},
b'known': {
b'args': {
b'nodes': {
b'default': [],
b'required': False,
b'type': b'list'
}
},
b'permissions': [
b'pull'
]
},
b'listkeys': {
b'args': {
b'namespace': {
b'required': True,
b'type': b'bytes'
}
},
b'permissions': [
b'pull'
]
},
b'lookup': {
b'args': {
b'key': {
b'required': True,
b'type': b'bytes'
}
},
b'permissions': [
b'pull'
]
},
b'manifestdata': {
b'args': {
b'fields': {
b'default': set([]),
b'required': False,
b'type': b'set',
b'validvalues': set([
b'parents',
b'revision'
])
},
b'haveparents': {
b'default': False,
b'required': False,
b'type': b'bool'
},
b'nodes': {
b'required': True,
b'type': b'list'
},
b'tree': {
b'required': True,
b'type': b'bytes'
}
},
b'permissions': [
b'pull'
],
b'recommendedbatchsize': 100000
},
b'pushkey': {
b'args': {
b'key': {
b'required': True,
b'type': b'bytes'
},
b'namespace': {
b'required': True,
b'type': b'bytes'
},
b'new': {
b'required': True,
b'type': b'bytes'
},
b'old': {
b'required': True,
b'type': b'bytes'
}
},
b'permissions': [
b'push'
]
}
},
b'framingmediatypes': [
b'application/mercurial-exp-framing-0006'
],
b'pathfilterprefixes': set([
b'path:',
b'rootfilesin:'
]),
b'rawrepoformats': [
b'generaldelta',
b'revlogv1'
]
}
]
$ test -f .hg/blackbox.log
[1]
An error is not cached
$ sendhttpv2peer << EOF
> command manifestdata
> nodes eval:[b'\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa']
> tree eval:b''
> fields eval:[b'parents']
> EOF
creating http peer for wire protocol version 2
sending manifestdata command
abort: unknown node: \xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa! (esc)
[255]
$ cat .hg/blackbox.log
*> cacher constructed for manifestdata (glob)
*> cache miss for 2cba2a7d0d1575fea2fe68f597e97a7c2ac2f705 (glob)
*> cacher exiting due to error (glob)
$ killdaemons.py
$ rm .hg/blackbox.log