filelog: wrap revlog instead of inheriting it (API)
The revlog base class exposes a ton of methods. Inheriting the
revlog class for filelog will make it difficult to expose a
clean interface. There will be abstraction violations.
This commit breaks the inheritance of revlog by the filelog
class. Filelog instances now contain a reference to a revlog
instance. Various properties and methods are now proxied to
that instance.
There is precedence for doing this: manifestlog does something
similar. Although, manifestlog has a cleaner interface than
filelog. We'll get there with filelog...
The new filelog class exposes a handful of extra properties and
methods that aren't part of the declared filelog interface.
Every extra item was added in order to get a test to pass. The
set of tests that failed without these extra proxies has
significant overlap with the set of tests that don't work with
the simple store repo. There should be no surprise there.
Hopefully the hardest part about this commit to review are the
changes to bundlerepo and unionrepo. Both repository types
define a custom revlog or revlog-like class and then have a
custom filelog that inherits from both filelog and their custom
revlog. This code has been changed so the filelog types don't
inherit from revlog. Instead, they replace the revlog instance
on the created filelog. This is super hacky. I plan to fix this
in a future commit by parameterizing filelog.__init__.
Because Python function call overhead is a thing, this change
could impact performance by introducing a nearly empty proxy
function for various methods and properties. I would gladly
measure the performance impact of it, but I'm not sure what
operations have tight loops over filelog attribute lookups
or function calls. I know some of the DAG traversal code can
be sensitive about the performance of e.g. parentrevs(). However,
many of these functions are implemented on the revlog class and
therefore have direct access to self.parentrevs() and aren't
going through a proxy.
.. api::
filelog.filelog is now a standalone class and doesn't inherit
from revlog. Instead, it wraps a revlog instance at self._revlog.
This change was made in an attempt to formalize storage APIs and
prevent revlog implementation details leaking through to callers.
Differential Revision: https://phab.mercurial-scm.org/D3154
from __future__ import absolute_import, print_function
import unittest
from mercurial.thirdparty import (
cbor,
)
from mercurial import (
util,
wireprotoframing as framing,
)
ffs = framing.makeframefromhumanstring
def makereactor(deferoutput=False):
return framing.serverreactor(deferoutput=deferoutput)
def sendframes(reactor, gen):
"""Send a generator of frame bytearray to a reactor.
Emits a generator of results from ``onframerecv()`` calls.
"""
for frame in gen:
header = framing.parseheader(frame)
payload = frame[framing.FRAME_HEADER_SIZE:]
assert len(payload) == header.length
yield reactor.onframerecv(framing.frame(header.requestid,
header.streamid,
header.streamflags,
header.typeid,
header.flags,
payload))
def sendcommandframes(reactor, stream, rid, cmd, args, datafh=None):
"""Generate frames to run a command and send them to a reactor."""
return sendframes(reactor,
framing.createcommandframes(stream, rid, cmd, args,
datafh))
class FrameHumanStringTests(unittest.TestCase):
def testbasic(self):
self.assertEqual(ffs(b'1 1 0 1 0 '),
b'\x00\x00\x00\x01\x00\x01\x00\x10')
self.assertEqual(ffs(b'2 4 0 1 0 '),
b'\x00\x00\x00\x02\x00\x04\x00\x10')
self.assertEqual(ffs(b'2 4 0 1 0 foo'),
b'\x03\x00\x00\x02\x00\x04\x00\x10foo')
def testcborint(self):
self.assertEqual(ffs(b'1 1 0 1 0 cbor:15'),
b'\x01\x00\x00\x01\x00\x01\x00\x10\x0f')
self.assertEqual(ffs(b'1 1 0 1 0 cbor:42'),
b'\x02\x00\x00\x01\x00\x01\x00\x10\x18*')
self.assertEqual(ffs(b'1 1 0 1 0 cbor:1048576'),
b'\x05\x00\x00\x01\x00\x01\x00\x10\x1a'
b'\x00\x10\x00\x00')
self.assertEqual(ffs(b'1 1 0 1 0 cbor:0'),
b'\x01\x00\x00\x01\x00\x01\x00\x10\x00')
self.assertEqual(ffs(b'1 1 0 1 0 cbor:-1'),
b'\x01\x00\x00\x01\x00\x01\x00\x10 ')
self.assertEqual(ffs(b'1 1 0 1 0 cbor:-342542'),
b'\x05\x00\x00\x01\x00\x01\x00\x10:\x00\x05:\r')
def testcborstrings(self):
self.assertEqual(ffs(b"1 1 0 1 0 cbor:b'foo'"),
b'\x04\x00\x00\x01\x00\x01\x00\x10Cfoo')
self.assertEqual(ffs(b"1 1 0 1 0 cbor:u'foo'"),
b'\x04\x00\x00\x01\x00\x01\x00\x10cfoo')
def testcborlists(self):
self.assertEqual(ffs(b"1 1 0 1 0 cbor:[None, True, False, 42, b'foo']"),
b'\n\x00\x00\x01\x00\x01\x00\x10\x85\xf6\xf5\xf4'
b'\x18*Cfoo')
def testcbordicts(self):
self.assertEqual(ffs(b"1 1 0 1 0 "
b"cbor:{b'foo': b'val1', b'bar': b'val2'}"),
b'\x13\x00\x00\x01\x00\x01\x00\x10\xa2'
b'CbarDval2CfooDval1')
class FrameTests(unittest.TestCase):
def testdataexactframesize(self):
data = util.bytesio(b'x' * framing.DEFAULT_MAX_FRAME_SIZE)
stream = framing.stream(1)
frames = list(framing.createcommandframes(stream, 1, b'command',
{}, data))
self.assertEqual(frames, [
ffs(b'1 1 stream-begin command-request new|have-data '
b"cbor:{b'name': b'command'}"),
ffs(b'1 1 0 command-data continuation %s' % data.getvalue()),
ffs(b'1 1 0 command-data eos ')
])
def testdatamultipleframes(self):
data = util.bytesio(b'x' * (framing.DEFAULT_MAX_FRAME_SIZE + 1))
stream = framing.stream(1)
frames = list(framing.createcommandframes(stream, 1, b'command', {},
data))
self.assertEqual(frames, [
ffs(b'1 1 stream-begin command-request new|have-data '
b"cbor:{b'name': b'command'}"),
ffs(b'1 1 0 command-data continuation %s' % (
b'x' * framing.DEFAULT_MAX_FRAME_SIZE)),
ffs(b'1 1 0 command-data eos x'),
])
def testargsanddata(self):
data = util.bytesio(b'x' * 100)
stream = framing.stream(1)
frames = list(framing.createcommandframes(stream, 1, b'command', {
b'key1': b'key1value',
b'key2': b'key2value',
b'key3': b'key3value',
}, data))
self.assertEqual(frames, [
ffs(b'1 1 stream-begin command-request new|have-data '
b"cbor:{b'name': b'command', b'args': {b'key1': b'key1value', "
b"b'key2': b'key2value', b'key3': b'key3value'}}"),
ffs(b'1 1 0 command-data eos %s' % data.getvalue()),
])
def testtextoutputformattingstringtype(self):
"""Formatting string must be bytes."""
with self.assertRaisesRegexp(ValueError, 'must use bytes formatting '):
list(framing.createtextoutputframe(None, 1, [
(b'foo'.decode('ascii'), [], [])]))
def testtextoutputargumentbytes(self):
with self.assertRaisesRegexp(ValueError, 'must use bytes for argument'):
list(framing.createtextoutputframe(None, 1, [
(b'foo', [b'foo'.decode('ascii')], [])]))
def testtextoutputlabelbytes(self):
with self.assertRaisesRegexp(ValueError, 'must use bytes for labels'):
list(framing.createtextoutputframe(None, 1, [
(b'foo', [], [b'foo'.decode('ascii')])]))
def testtextoutput1simpleatom(self):
stream = framing.stream(1)
val = list(framing.createtextoutputframe(stream, 1, [
(b'foo', [], [])]))
self.assertEqual(val, [
ffs(b'1 1 stream-begin text-output 0 '
b"cbor:[{b'msg': b'foo'}]"),
])
def testtextoutput2simpleatoms(self):
stream = framing.stream(1)
val = list(framing.createtextoutputframe(stream, 1, [
(b'foo', [], []),
(b'bar', [], []),
]))
self.assertEqual(val, [
ffs(b'1 1 stream-begin text-output 0 '
b"cbor:[{b'msg': b'foo'}, {b'msg': b'bar'}]")
])
def testtextoutput1arg(self):
stream = framing.stream(1)
val = list(framing.createtextoutputframe(stream, 1, [
(b'foo %s', [b'val1'], []),
]))
self.assertEqual(val, [
ffs(b'1 1 stream-begin text-output 0 '
b"cbor:[{b'msg': b'foo %s', b'args': [b'val1']}]")
])
def testtextoutput2arg(self):
stream = framing.stream(1)
val = list(framing.createtextoutputframe(stream, 1, [
(b'foo %s %s', [b'val', b'value'], []),
]))
self.assertEqual(val, [
ffs(b'1 1 stream-begin text-output 0 '
b"cbor:[{b'msg': b'foo %s %s', b'args': [b'val', b'value']}]")
])
def testtextoutput1label(self):
stream = framing.stream(1)
val = list(framing.createtextoutputframe(stream, 1, [
(b'foo', [], [b'label']),
]))
self.assertEqual(val, [
ffs(b'1 1 stream-begin text-output 0 '
b"cbor:[{b'msg': b'foo', b'labels': [b'label']}]")
])
def testargandlabel(self):
stream = framing.stream(1)
val = list(framing.createtextoutputframe(stream, 1, [
(b'foo %s', [b'arg'], [b'label']),
]))
self.assertEqual(val, [
ffs(b'1 1 stream-begin text-output 0 '
b"cbor:[{b'msg': b'foo %s', b'args': [b'arg'], "
b"b'labels': [b'label']}]")
])
class ServerReactorTests(unittest.TestCase):
def _sendsingleframe(self, reactor, f):
results = list(sendframes(reactor, [f]))
self.assertEqual(len(results), 1)
return results[0]
def assertaction(self, res, expected):
self.assertIsInstance(res, tuple)
self.assertEqual(len(res), 2)
self.assertIsInstance(res[1], dict)
self.assertEqual(res[0], expected)
def assertframesequal(self, frames, framestrings):
expected = [ffs(s) for s in framestrings]
self.assertEqual(list(frames), expected)
def test1framecommand(self):
"""Receiving a command in a single frame yields request to run it."""
reactor = makereactor()
stream = framing.stream(1)
results = list(sendcommandframes(reactor, stream, 1, b'mycommand', {}))
self.assertEqual(len(results), 1)
self.assertaction(results[0], 'runcommand')
self.assertEqual(results[0][1], {
'requestid': 1,
'command': b'mycommand',
'args': {},
'data': None,
})
result = reactor.oninputeof()
self.assertaction(result, 'noop')
def test1argument(self):
reactor = makereactor()
stream = framing.stream(1)
results = list(sendcommandframes(reactor, stream, 41, b'mycommand',
{b'foo': b'bar'}))
self.assertEqual(len(results), 1)
self.assertaction(results[0], 'runcommand')
self.assertEqual(results[0][1], {
'requestid': 41,
'command': b'mycommand',
'args': {b'foo': b'bar'},
'data': None,
})
def testmultiarguments(self):
reactor = makereactor()
stream = framing.stream(1)
results = list(sendcommandframes(reactor, stream, 1, b'mycommand',
{b'foo': b'bar', b'biz': b'baz'}))
self.assertEqual(len(results), 1)
self.assertaction(results[0], 'runcommand')
self.assertEqual(results[0][1], {
'requestid': 1,
'command': b'mycommand',
'args': {b'foo': b'bar', b'biz': b'baz'},
'data': None,
})
def testsimplecommanddata(self):
reactor = makereactor()
stream = framing.stream(1)
results = list(sendcommandframes(reactor, stream, 1, b'mycommand', {},
util.bytesio(b'data!')))
self.assertEqual(len(results), 2)
self.assertaction(results[0], 'wantframe')
self.assertaction(results[1], 'runcommand')
self.assertEqual(results[1][1], {
'requestid': 1,
'command': b'mycommand',
'args': {},
'data': b'data!',
})
def testmultipledataframes(self):
frames = [
ffs(b'1 1 stream-begin command-request new|have-data '
b"cbor:{b'name': b'mycommand'}"),
ffs(b'1 1 0 command-data continuation data1'),
ffs(b'1 1 0 command-data continuation data2'),
ffs(b'1 1 0 command-data eos data3'),
]
reactor = makereactor()
results = list(sendframes(reactor, frames))
self.assertEqual(len(results), 4)
for i in range(3):
self.assertaction(results[i], 'wantframe')
self.assertaction(results[3], 'runcommand')
self.assertEqual(results[3][1], {
'requestid': 1,
'command': b'mycommand',
'args': {},
'data': b'data1data2data3',
})
def testargumentanddata(self):
frames = [
ffs(b'1 1 stream-begin command-request new|have-data '
b"cbor:{b'name': b'command', b'args': {b'key': b'val',"
b"b'foo': b'bar'}}"),
ffs(b'1 1 0 command-data continuation value1'),
ffs(b'1 1 0 command-data eos value2'),
]
reactor = makereactor()
results = list(sendframes(reactor, frames))
self.assertaction(results[-1], 'runcommand')
self.assertEqual(results[-1][1], {
'requestid': 1,
'command': b'command',
'args': {
b'key': b'val',
b'foo': b'bar',
},
'data': b'value1value2',
})
def testnewandcontinuation(self):
result = self._sendsingleframe(makereactor(),
ffs(b'1 1 stream-begin command-request new|continuation '))
self.assertaction(result, 'error')
self.assertEqual(result[1], {
'message': b'received command request frame with both new and '
b'continuation flags set',
})
def testneithernewnorcontinuation(self):
result = self._sendsingleframe(makereactor(),
ffs(b'1 1 stream-begin command-request 0 '))
self.assertaction(result, 'error')
self.assertEqual(result[1], {
'message': b'received command request frame with neither new nor '
b'continuation flags set',
})
def testunexpectedcommanddata(self):
"""Command data frame when not running a command is an error."""
result = self._sendsingleframe(makereactor(),
ffs(b'1 1 stream-begin command-data 0 ignored'))
self.assertaction(result, 'error')
self.assertEqual(result[1], {
'message': b'expected command request frame; got 3',
})
def testunexpectedcommanddatareceiving(self):
"""Same as above except the command is receiving."""
results = list(sendframes(makereactor(), [
ffs(b'1 1 stream-begin command-request new|more '
b"cbor:{b'name': b'ignored'}"),
ffs(b'1 1 0 command-data eos ignored'),
]))
self.assertaction(results[0], 'wantframe')
self.assertaction(results[1], 'error')
self.assertEqual(results[1][1], {
'message': b'received command data frame for request that is not '
b'expecting data: 1',
})
def testconflictingrequestidallowed(self):
"""Multiple fully serviced commands with same request ID is allowed."""
reactor = makereactor()
results = []
outstream = reactor.makeoutputstream()
results.append(self._sendsingleframe(
reactor, ffs(b'1 1 stream-begin command-request new '
b"cbor:{b'name': b'command'}")))
result = reactor.onbytesresponseready(outstream, 1, b'response1')
self.assertaction(result, 'sendframes')
list(result[1]['framegen'])
results.append(self._sendsingleframe(
reactor, ffs(b'1 1 stream-begin command-request new '
b"cbor:{b'name': b'command'}")))
result = reactor.onbytesresponseready(outstream, 1, b'response2')
self.assertaction(result, 'sendframes')
list(result[1]['framegen'])
results.append(self._sendsingleframe(
reactor, ffs(b'1 1 stream-begin command-request new '
b"cbor:{b'name': b'command'}")))
result = reactor.onbytesresponseready(outstream, 1, b'response3')
self.assertaction(result, 'sendframes')
list(result[1]['framegen'])
for i in range(3):
self.assertaction(results[i], 'runcommand')
self.assertEqual(results[i][1], {
'requestid': 1,
'command': b'command',
'args': {},
'data': None,
})
def testconflictingrequestid(self):
"""Request ID for new command matching in-flight command is illegal."""
results = list(sendframes(makereactor(), [
ffs(b'1 1 stream-begin command-request new|more '
b"cbor:{b'name': b'command'}"),
ffs(b'1 1 0 command-request new '
b"cbor:{b'name': b'command1'}"),
]))
self.assertaction(results[0], 'wantframe')
self.assertaction(results[1], 'error')
self.assertEqual(results[1][1], {
'message': b'request with ID 1 already received',
})
def testinterleavedcommands(self):
cbor1 = cbor.dumps({
b'name': b'command1',
b'args': {
b'foo': b'bar',
b'key1': b'val',
}
}, canonical=True)
cbor3 = cbor.dumps({
b'name': b'command3',
b'args': {
b'biz': b'baz',
b'key': b'val',
},
}, canonical=True)
results = list(sendframes(makereactor(), [
ffs(b'1 1 stream-begin command-request new|more %s' % cbor1[0:6]),
ffs(b'3 1 0 command-request new|more %s' % cbor3[0:10]),
ffs(b'1 1 0 command-request continuation|more %s' % cbor1[6:9]),
ffs(b'3 1 0 command-request continuation|more %s' % cbor3[10:13]),
ffs(b'3 1 0 command-request continuation %s' % cbor3[13:]),
ffs(b'1 1 0 command-request continuation %s' % cbor1[9:]),
]))
self.assertEqual([t[0] for t in results], [
'wantframe',
'wantframe',
'wantframe',
'wantframe',
'runcommand',
'runcommand',
])
self.assertEqual(results[4][1], {
'requestid': 3,
'command': 'command3',
'args': {b'biz': b'baz', b'key': b'val'},
'data': None,
})
self.assertEqual(results[5][1], {
'requestid': 1,
'command': 'command1',
'args': {b'foo': b'bar', b'key1': b'val'},
'data': None,
})
def testmissingcommanddataframe(self):
# The reactor doesn't currently handle partially received commands.
# So this test is failing to do anything with request 1.
frames = [
ffs(b'1 1 stream-begin command-request new|have-data '
b"cbor:{b'name': b'command1'}"),
ffs(b'3 1 0 command-request new '
b"cbor:{b'name': b'command2'}"),
]
results = list(sendframes(makereactor(), frames))
self.assertEqual(len(results), 2)
self.assertaction(results[0], 'wantframe')
self.assertaction(results[1], 'runcommand')
def testmissingcommanddataframeflags(self):
frames = [
ffs(b'1 1 stream-begin command-request new|have-data '
b"cbor:{b'name': b'command1'}"),
ffs(b'1 1 0 command-data 0 data'),
]
results = list(sendframes(makereactor(), frames))
self.assertEqual(len(results), 2)
self.assertaction(results[0], 'wantframe')
self.assertaction(results[1], 'error')
self.assertEqual(results[1][1], {
'message': b'command data frame without flags',
})
def testframefornonreceivingrequest(self):
"""Receiving a frame for a command that is not receiving is illegal."""
results = list(sendframes(makereactor(), [
ffs(b'1 1 stream-begin command-request new '
b"cbor:{b'name': b'command1'}"),
ffs(b'3 1 0 command-request new|have-data '
b"cbor:{b'name': b'command3'}"),
ffs(b'5 1 0 command-data eos ignored'),
]))
self.assertaction(results[2], 'error')
self.assertEqual(results[2][1], {
'message': b'received frame for request that is not receiving: 5',
})
def testsimpleresponse(self):
"""Bytes response to command sends result frames."""
reactor = makereactor()
instream = framing.stream(1)
list(sendcommandframes(reactor, instream, 1, b'mycommand', {}))
outstream = reactor.makeoutputstream()
result = reactor.onbytesresponseready(outstream, 1, b'response')
self.assertaction(result, 'sendframes')
self.assertframesequal(result[1]['framegen'], [
b'1 2 stream-begin bytes-response eos response',
])
def testmultiframeresponse(self):
"""Bytes response spanning multiple frames is handled."""
first = b'x' * framing.DEFAULT_MAX_FRAME_SIZE
second = b'y' * 100
reactor = makereactor()
instream = framing.stream(1)
list(sendcommandframes(reactor, instream, 1, b'mycommand', {}))
outstream = reactor.makeoutputstream()
result = reactor.onbytesresponseready(outstream, 1, first + second)
self.assertaction(result, 'sendframes')
self.assertframesequal(result[1]['framegen'], [
b'1 2 stream-begin bytes-response continuation %s' % first,
b'1 2 0 bytes-response eos %s' % second,
])
def testapplicationerror(self):
reactor = makereactor()
instream = framing.stream(1)
list(sendcommandframes(reactor, instream, 1, b'mycommand', {}))
outstream = reactor.makeoutputstream()
result = reactor.onapplicationerror(outstream, 1, b'some message')
self.assertaction(result, 'sendframes')
self.assertframesequal(result[1]['framegen'], [
b'1 2 stream-begin error-response application some message',
])
def test1commanddeferresponse(self):
"""Responses when in deferred output mode are delayed until EOF."""
reactor = makereactor(deferoutput=True)
instream = framing.stream(1)
results = list(sendcommandframes(reactor, instream, 1, b'mycommand',
{}))
self.assertEqual(len(results), 1)
self.assertaction(results[0], 'runcommand')
outstream = reactor.makeoutputstream()
result = reactor.onbytesresponseready(outstream, 1, b'response')
self.assertaction(result, 'noop')
result = reactor.oninputeof()
self.assertaction(result, 'sendframes')
self.assertframesequal(result[1]['framegen'], [
b'1 2 stream-begin bytes-response eos response',
])
def testmultiplecommanddeferresponse(self):
reactor = makereactor(deferoutput=True)
instream = framing.stream(1)
list(sendcommandframes(reactor, instream, 1, b'command1', {}))
list(sendcommandframes(reactor, instream, 3, b'command2', {}))
outstream = reactor.makeoutputstream()
result = reactor.onbytesresponseready(outstream, 1, b'response1')
self.assertaction(result, 'noop')
result = reactor.onbytesresponseready(outstream, 3, b'response2')
self.assertaction(result, 'noop')
result = reactor.oninputeof()
self.assertaction(result, 'sendframes')
self.assertframesequal(result[1]['framegen'], [
b'1 2 stream-begin bytes-response eos response1',
b'3 2 0 bytes-response eos response2'
])
def testrequestidtracking(self):
reactor = makereactor(deferoutput=True)
instream = framing.stream(1)
list(sendcommandframes(reactor, instream, 1, b'command1', {}))
list(sendcommandframes(reactor, instream, 3, b'command2', {}))
list(sendcommandframes(reactor, instream, 5, b'command3', {}))
# Register results for commands out of order.
outstream = reactor.makeoutputstream()
reactor.onbytesresponseready(outstream, 3, b'response3')
reactor.onbytesresponseready(outstream, 1, b'response1')
reactor.onbytesresponseready(outstream, 5, b'response5')
result = reactor.oninputeof()
self.assertaction(result, 'sendframes')
self.assertframesequal(result[1]['framegen'], [
b'3 2 stream-begin bytes-response eos response3',
b'1 2 0 bytes-response eos response1',
b'5 2 0 bytes-response eos response5',
])
def testduplicaterequestonactivecommand(self):
"""Receiving a request ID that matches a request that isn't finished."""
reactor = makereactor()
stream = framing.stream(1)
list(sendcommandframes(reactor, stream, 1, b'command1', {}))
results = list(sendcommandframes(reactor, stream, 1, b'command1', {}))
self.assertaction(results[0], 'error')
self.assertEqual(results[0][1], {
'message': b'request with ID 1 is already active',
})
def testduplicaterequestonactivecommandnosend(self):
"""Same as above but we've registered a response but haven't sent it."""
reactor = makereactor()
instream = framing.stream(1)
list(sendcommandframes(reactor, instream, 1, b'command1', {}))
outstream = reactor.makeoutputstream()
reactor.onbytesresponseready(outstream, 1, b'response')
# We've registered the response but haven't sent it. From the
# perspective of the reactor, the command is still active.
results = list(sendcommandframes(reactor, instream, 1, b'command1', {}))
self.assertaction(results[0], 'error')
self.assertEqual(results[0][1], {
'message': b'request with ID 1 is already active',
})
def testduplicaterequestaftersend(self):
"""We can use a duplicate request ID after we've sent the response."""
reactor = makereactor()
instream = framing.stream(1)
list(sendcommandframes(reactor, instream, 1, b'command1', {}))
outstream = reactor.makeoutputstream()
res = reactor.onbytesresponseready(outstream, 1, b'response')
list(res[1]['framegen'])
results = list(sendcommandframes(reactor, instream, 1, b'command1', {}))
self.assertaction(results[0], 'runcommand')
if __name__ == '__main__':
import silenttestrunner
silenttestrunner.main(__name__)