wireproto: support for receiving multiple requests
Now that we have request IDs on each frame and a specification
that allows multiple requests to be issued simultaneously,
possibly interleaved, let's teach the server to deal with that.
Instead of tracking the state for *the* active command request,
we instead track the state of each receiving command by its
request ID. The multiple states in our state machine for processing
each command's state has been collapsed into a single state for
"receiving commands."
Tests have been added so our branch coverage covers all meaningful
branches.
However, we did lose some logical coverage. The implementation
of this new feature opens up the door to a server having partial
command requests when end of input is reached. We will probably
want a mechanism to deal with partial requests. For now, I've
tracked that as a known issue in the class docstring. I've
also noted an abuse vector that becomes a little bit easier to
exploit with this feature.
Differential Revision: https://phab.mercurial-scm.org/D2870
from __future__ import absolute_import, print_function
import unittest
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:
rid, frametype, frameflags, framelength = framing.parseheader(frame)
payload = frame[framing.FRAME_HEADER_SIZE:]
assert len(payload) == framelength
yield reactor.onframerecv(rid, frametype, frameflags, payload)
def sendcommandframes(reactor, rid, cmd, args, datafh=None):
"""Generate frames to run a command and send them to a reactor."""
return sendframes(reactor,
framing.createcommandframes(rid, cmd, args, datafh))
class FrameTests(unittest.TestCase):
def testdataexactframesize(self):
data = util.bytesio(b'x' * framing.DEFAULT_MAX_FRAME_SIZE)
frames = list(framing.createcommandframes(1, b'command', {}, data))
self.assertEqual(frames, [
ffs(b'1 command-name have-data command'),
ffs(b'1 command-data continuation %s' % data.getvalue()),
ffs(b'1 command-data eos ')
])
def testdatamultipleframes(self):
data = util.bytesio(b'x' * (framing.DEFAULT_MAX_FRAME_SIZE + 1))
frames = list(framing.createcommandframes(1, b'command', {}, data))
self.assertEqual(frames, [
ffs(b'1 command-name have-data command'),
ffs(b'1 command-data continuation %s' % (
b'x' * framing.DEFAULT_MAX_FRAME_SIZE)),
ffs(b'1 command-data eos x'),
])
def testargsanddata(self):
data = util.bytesio(b'x' * 100)
frames = list(framing.createcommandframes(1, b'command', {
b'key1': b'key1value',
b'key2': b'key2value',
b'key3': b'key3value',
}, data))
self.assertEqual(frames, [
ffs(b'1 command-name have-args|have-data command'),
ffs(br'1 command-argument 0 \x04\x00\x09\x00key1key1value'),
ffs(br'1 command-argument 0 \x04\x00\x09\x00key2key2value'),
ffs(br'1 command-argument eoa \x04\x00\x09\x00key3key3value'),
ffs(b'1 command-data eos %s' % data.getvalue()),
])
class ServerReactorTests(unittest.TestCase):
def _sendsingleframe(self, reactor, s):
results = list(sendframes(reactor, [ffs(s)]))
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()
results = list(sendcommandframes(reactor, 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()
results = list(sendcommandframes(reactor, 41, b'mycommand',
{b'foo': b'bar'}))
self.assertEqual(len(results), 2)
self.assertaction(results[0], 'wantframe')
self.assertaction(results[1], 'runcommand')
self.assertEqual(results[1][1], {
'requestid': 41,
'command': b'mycommand',
'args': {b'foo': b'bar'},
'data': None,
})
def testmultiarguments(self):
reactor = makereactor()
results = list(sendcommandframes(reactor, 1, b'mycommand',
{b'foo': b'bar', b'biz': b'baz'}))
self.assertEqual(len(results), 3)
self.assertaction(results[0], 'wantframe')
self.assertaction(results[1], 'wantframe')
self.assertaction(results[2], 'runcommand')
self.assertEqual(results[2][1], {
'requestid': 1,
'command': b'mycommand',
'args': {b'foo': b'bar', b'biz': b'baz'},
'data': None,
})
def testsimplecommanddata(self):
reactor = makereactor()
results = list(sendcommandframes(reactor, 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 command-name have-data mycommand'),
ffs(b'1 command-data continuation data1'),
ffs(b'1 command-data continuation data2'),
ffs(b'1 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 command-name have-args|have-data command'),
ffs(br'1 command-argument 0 \x03\x00\x03\x00keyval'),
ffs(br'1 command-argument eoa \x03\x00\x03\x00foobar'),
ffs(b'1 command-data continuation value1'),
ffs(b'1 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 testunexpectedcommandargument(self):
"""Command argument frame when not running a command is an error."""
result = self._sendsingleframe(makereactor(),
b'1 command-argument 0 ignored')
self.assertaction(result, 'error')
self.assertEqual(result[1], {
'message': b'expected command frame; got 2',
})
def testunexpectedcommandargumentreceiving(self):
"""Same as above but the command is receiving."""
results = list(sendframes(makereactor(), [
ffs(b'1 command-name have-data command'),
ffs(b'1 command-argument eoa ignored'),
]))
self.assertaction(results[1], 'error')
self.assertEqual(results[1][1], {
'message': b'received command argument frame for request that is '
b'not expecting arguments: 1',
})
def testunexpectedcommanddata(self):
"""Command argument frame when not running a command is an error."""
result = self._sendsingleframe(makereactor(),
b'1 command-data 0 ignored')
self.assertaction(result, 'error')
self.assertEqual(result[1], {
'message': b'expected command frame; got 3',
})
def testunexpectedcommanddatareceiving(self):
"""Same as above except the command is receiving."""
results = list(sendframes(makereactor(), [
ffs(b'1 command-name have-args command'),
ffs(b'1 command-data eos ignored'),
]))
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 testmissingcommandframeflags(self):
"""Command name frame must have flags set."""
result = self._sendsingleframe(makereactor(),
b'1 command-name 0 command')
self.assertaction(result, 'error')
self.assertEqual(result[1], {
'message': b'missing frame flags on command frame',
})
def testconflictingrequestid(self):
"""Multiple fully serviced commands with same request ID is allowed."""
results = list(sendframes(makereactor(), [
ffs(b'1 command-name eos command'),
ffs(b'1 command-name eos command'),
ffs(b'1 command-name eos command'),
]))
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 command-name have-args command'),
ffs(b'1 command-name eos command'),
]))
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):
results = list(sendframes(makereactor(), [
ffs(b'1 command-name have-args command1'),
ffs(b'3 command-name have-args command3'),
ffs(br'1 command-argument 0 \x03\x00\x03\x00foobar'),
ffs(br'3 command-argument 0 \x03\x00\x03\x00bizbaz'),
ffs(br'3 command-argument eoa \x03\x00\x03\x00keyval'),
ffs(br'1 command-argument eoa \x04\x00\x03\x00key1val'),
]))
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 testmissingargumentframe(self):
# This test attempts to test behavior when reactor has an incomplete
# command request waiting on argument data. But it doesn't handle that
# scenario yet. So this test does nothing of value.
frames = [
ffs(b'1 command-name have-args command'),
]
results = list(sendframes(makereactor(), frames))
self.assertaction(results[0], 'wantframe')
def testincompleteargumentname(self):
"""Argument frame with incomplete name."""
frames = [
ffs(b'1 command-name have-args command1'),
ffs(br'1 command-argument eoa \x04\x00\xde\xadfoo'),
]
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'malformed argument frame: partial argument name',
})
def testincompleteargumentvalue(self):
"""Argument frame with incomplete value."""
frames = [
ffs(b'1 command-name have-args command'),
ffs(br'1 command-argument eoa \x03\x00\xaa\xaafoopartialvalue'),
]
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'malformed argument frame: partial argument value',
})
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 command-name have-data command1'),
ffs(b'3 command-name eos 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 command-name have-data command1'),
ffs(b'1 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 command-name eos command1'),
ffs(b'3 command-name have-data command3'),
ffs(b'1 command-argument eoa ignored'),
]))
self.assertaction(results[2], 'error')
self.assertEqual(results[2][1], {
'message': b'received frame for request that is not receiving: 1',
})
def testsimpleresponse(self):
"""Bytes response to command sends result frames."""
reactor = makereactor()
list(sendcommandframes(reactor, 1, b'mycommand', {}))
result = reactor.onbytesresponseready(1, b'response')
self.assertaction(result, 'sendframes')
self.assertframesequal(result[1]['framegen'], [
b'1 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()
list(sendcommandframes(reactor, 1, b'mycommand', {}))
result = reactor.onbytesresponseready(1, first + second)
self.assertaction(result, 'sendframes')
self.assertframesequal(result[1]['framegen'], [
b'1 bytes-response continuation %s' % first,
b'1 bytes-response eos %s' % second,
])
def testapplicationerror(self):
reactor = makereactor()
list(sendcommandframes(reactor, 1, b'mycommand', {}))
result = reactor.onapplicationerror(1, b'some message')
self.assertaction(result, 'sendframes')
self.assertframesequal(result[1]['framegen'], [
b'1 error-response application some message',
])
def test1commanddeferresponse(self):
"""Responses when in deferred output mode are delayed until EOF."""
reactor = makereactor(deferoutput=True)
results = list(sendcommandframes(reactor, 1, b'mycommand', {}))
self.assertEqual(len(results), 1)
self.assertaction(results[0], 'runcommand')
result = reactor.onbytesresponseready(1, b'response')
self.assertaction(result, 'noop')
result = reactor.oninputeof()
self.assertaction(result, 'sendframes')
self.assertframesequal(result[1]['framegen'], [
b'1 bytes-response eos response',
])
def testmultiplecommanddeferresponse(self):
reactor = makereactor(deferoutput=True)
list(sendcommandframes(reactor, 1, b'command1', {}))
list(sendcommandframes(reactor, 3, b'command2', {}))
result = reactor.onbytesresponseready(1, b'response1')
self.assertaction(result, 'noop')
result = reactor.onbytesresponseready(3, b'response2')
self.assertaction(result, 'noop')
result = reactor.oninputeof()
self.assertaction(result, 'sendframes')
self.assertframesequal(result[1]['framegen'], [
b'1 bytes-response eos response1',
b'3 bytes-response eos response2'
])
def testrequestidtracking(self):
reactor = makereactor(deferoutput=True)
list(sendcommandframes(reactor, 1, b'command1', {}))
list(sendcommandframes(reactor, 3, b'command2', {}))
list(sendcommandframes(reactor, 5, b'command3', {}))
# Register results for commands out of order.
reactor.onbytesresponseready(3, b'response3')
reactor.onbytesresponseready(1, b'response1')
reactor.onbytesresponseready(5, b'response5')
result = reactor.oninputeof()
self.assertaction(result, 'sendframes')
self.assertframesequal(result[1]['framegen'], [
b'3 bytes-response eos response3',
b'1 bytes-response eos response1',
b'5 bytes-response eos response5',
])
if __name__ == '__main__':
import silenttestrunner
silenttestrunner.main(__name__)