24
24
bzrlib/transport/smart/__init__.py.
27
from __future__ import absolute_import
32
35
from bzrlib.lazy_import import lazy_import
33
36
lazy_import(globals(), """
45
from bzrlib.smart import client, protocol, request, vfs
50
from bzrlib.i18n import gettext
51
from bzrlib.smart import client, protocol, request, signals, vfs
46
52
from bzrlib.transport import ssh
48
54
from bzrlib import osutils
175
181
ui.ui_factory.report_transport_activity(self, bytes, direction)
184
_bad_file_descriptor = (errno.EBADF,)
185
if sys.platform == 'win32':
186
# Given on Windows if you pass a closed socket to select.select. Probably
187
# also given if you pass a file handle to select.
189
_bad_file_descriptor += (WSAENOTSOCK,)
178
192
class SmartServerStreamMedium(SmartMedium):
179
193
"""Handles smart commands coming over a stream.
193
207
the stream. See also the _push_back method.
196
def __init__(self, backing_transport, root_client_path='/'):
212
def __init__(self, backing_transport, root_client_path='/', timeout=None):
197
213
"""Construct new server.
199
215
:param backing_transport: Transport for the directory served.
202
218
self.backing_transport = backing_transport
203
219
self.root_client_path = root_client_path
204
220
self.finished = False
222
raise AssertionError('You must supply a timeout.')
223
self._client_timeout = timeout
224
self._client_poll_timeout = min(timeout / 10.0, 1.0)
205
225
SmartMedium.__init__(self)
213
233
while not self.finished:
214
234
server_protocol = self._build_protocol()
215
235
self._serve_one_request(server_protocol)
236
except errors.ConnectionTimeout, e:
237
trace.note('%s' % (e,))
238
trace.log_exception_quietly()
239
self._disconnect_client()
240
# We reported it, no reason to make a big fuss.
216
242
except Exception, e:
217
243
stderr.write("%s terminating on exception %s\n" % (self, e))
245
self._disconnect_client()
247
def _stop_gracefully(self):
248
"""When we finish this message, stop looking for more."""
249
trace.mutter('Stopping %s' % (self,))
252
def _disconnect_client(self):
253
"""Close the current connection. We stopped due to a timeout/etc."""
254
# The default implementation is a no-op, because that is all we used to
255
# do when disconnecting from a client. I suppose we never had the
256
# *server* initiate a disconnect, before
258
def _wait_for_bytes_with_timeout(self, timeout_seconds):
259
"""Wait for more bytes to be read, but timeout if none available.
261
This allows us to detect idle connections, and stop trying to read from
262
them, without setting the socket itself to non-blocking. This also
263
allows us to specify when we watch for idle timeouts.
265
:return: Did we timeout? (True if we timed out, False if there is data
268
raise NotImplementedError(self._wait_for_bytes_with_timeout)
220
270
def _build_protocol(self):
221
271
"""Identifies the version of the incoming request, and returns an
227
277
:returns: a SmartServerRequestProtocol.
279
self._wait_for_bytes_with_timeout(self._client_timeout)
281
# We're stopping, so don't try to do any more work
229
283
bytes = self._get_line()
230
284
protocol_factory, unused_bytes = _get_protocol_factory_for_bytes(bytes)
231
285
protocol = protocol_factory(
233
287
protocol.accept_bytes(unused_bytes)
290
def _wait_on_descriptor(self, fd, timeout_seconds):
291
"""select() on a file descriptor, waiting for nonblocking read()
293
This will raise a ConnectionTimeout exception if we do not get a
294
readable handle before timeout_seconds.
297
t_end = self._timer() + timeout_seconds
298
poll_timeout = min(timeout_seconds, self._client_poll_timeout)
300
while not rs and not xs and self._timer() < t_end:
304
rs, _, xs = select.select([fd], [], [fd], poll_timeout)
305
except (select.error, socket.error) as e:
306
err = getattr(e, 'errno', None)
307
if err is None and getattr(e, 'args', None) is not None:
308
# select.error doesn't have 'errno', it just has args[0]
310
if err in _bad_file_descriptor:
311
return # Not a socket indicates read() will fail
312
elif err == errno.EINTR:
313
# Interrupted, keep looping.
318
raise errors.ConnectionTimeout('disconnecting client after %.1f seconds'
319
% (timeout_seconds,))
236
321
def _serve_one_request(self, protocol):
237
322
"""Read one request from input, process, send back a response.
239
324
:param protocol: a SmartServerRequestProtocol.
242
329
self._serve_one_request_unguarded(protocol)
243
330
except KeyboardInterrupt:
260
347
class SmartServerSocketStreamMedium(SmartServerStreamMedium):
262
def __init__(self, sock, backing_transport, root_client_path='/'):
349
def __init__(self, sock, backing_transport, root_client_path='/',
265
353
:param sock: the socket the server will read from. It will be put
266
354
into blocking mode.
268
356
SmartServerStreamMedium.__init__(
269
self, backing_transport, root_client_path=root_client_path)
357
self, backing_transport, root_client_path=root_client_path,
270
359
sock.setblocking(True)
271
360
self.socket = sock
361
# Get the getpeername now, as we might be closed later when we care.
363
self._client_info = sock.getpeername()
365
self._client_info = '<unknown>'
368
return '%s(client=%s)' % (self.__class__.__name__, self._client_info)
371
return '%s.%s(client=%s)' % (self.__module__, self.__class__.__name__,
273
374
def _serve_one_request_unguarded(self, protocol):
274
375
while protocol.next_read_size():
284
385
self._push_back(protocol.unused_data)
387
def _disconnect_client(self):
388
"""Close the current connection. We stopped due to a timeout/etc."""
391
def _wait_for_bytes_with_timeout(self, timeout_seconds):
392
"""Wait for more bytes to be read, but timeout if none available.
394
This allows us to detect idle connections, and stop trying to read from
395
them, without setting the socket itself to non-blocking. This also
396
allows us to specify when we watch for idle timeouts.
398
:return: None, this will raise ConnectionTimeout if we time out before
401
return self._wait_on_descriptor(self.socket, timeout_seconds)
286
403
def _read_bytes(self, desired_count):
287
404
return osutils.read_bytes_from_socket(
288
405
self.socket, self._report_activity)
306
423
class SmartServerPipeStreamMedium(SmartServerStreamMedium):
308
def __init__(self, in_file, out_file, backing_transport):
425
def __init__(self, in_file, out_file, backing_transport, timeout=None):
309
426
"""Construct new server.
311
428
:param in_file: Python file from which requests can be read.
312
429
:param out_file: Python file to write responses.
313
430
:param backing_transport: Transport for the directory served.
315
SmartServerStreamMedium.__init__(self, backing_transport)
432
SmartServerStreamMedium.__init__(self, backing_transport,
316
434
if sys.platform == 'win32':
317
435
# force binary mode for files
323
441
self._in = in_file
324
442
self._out = out_file
445
"""See SmartServerStreamMedium.serve"""
446
# This is the regular serve, except it adds signal trapping for soft
448
stop_gracefully = self._stop_gracefully
449
signals.register_on_hangup(id(self), stop_gracefully)
451
return super(SmartServerPipeStreamMedium, self).serve()
453
signals.unregister_on_hangup(id(self))
326
455
def _serve_one_request_unguarded(self, protocol):
328
457
# We need to be careful not to read past the end of the current
342
471
protocol.accept_bytes(bytes)
473
def _disconnect_client(self):
478
def _wait_for_bytes_with_timeout(self, timeout_seconds):
479
"""Wait for more bytes to be read, but timeout if none available.
481
This allows us to detect idle connections, and stop trying to read from
482
them, without setting the socket itself to non-blocking. This also
483
allows us to specify when we watch for idle timeouts.
485
:return: None, this will raise ConnectionTimeout if we time out before
488
if (getattr(self._in, 'fileno', None) is None
489
or sys.platform == 'win32'):
490
# You can't select() file descriptors on Windows.
492
return self._wait_on_descriptor(self._in, timeout_seconds)
344
494
def _read_bytes(self, desired_count):
345
495
return self._in.read(desired_count)
490
640
return self._medium._get_line()
643
class _VfsRefuser(object):
644
"""An object that refuses all VFS requests.
649
client._SmartClient.hooks.install_named_hook(
650
'call', self.check_vfs, 'vfs refuser')
652
def check_vfs(self, params):
654
request_method = request.request_handlers.get(params.method)
656
# A method we don't know about doesn't count as a VFS method.
658
if issubclass(request_method, vfs.VfsRequest):
659
raise errors.HpssVfsRequestNotAllowed(params.method, params.args)
493
662
class _DebugCounter(object):
494
663
"""An object that counts the HPSS calls made to each client medium.
542
711
value['count'] = 0
543
712
value['vfs_count'] = 0
545
trace.note('HPSS calls: %d (%d vfs) %s',
546
count, vfs_count, medium_repr)
714
trace.note(gettext('HPSS calls: {0} ({1} vfs) {2}').format(
715
count, vfs_count, medium_repr))
548
717
def flush_all(self):
549
718
for ref in list(self.counts.keys()):
552
721
_debug_counter = None
555
725
class SmartClientMedium(SmartMedium):
572
742
if _debug_counter is None:
573
743
_debug_counter = _DebugCounter()
574
744
_debug_counter.track(self)
745
if 'hpss_client_no_vfs' in debug.debug_flags:
747
if _vfs_refuser is None:
748
_vfs_refuser = _VfsRefuser()
576
750
def _is_remote_before(self, version_tuple):
577
751
"""Is it possible the remote side supports RPCs for a given version?
669
843
medium_base = urlutils.join(self.base, '/')
670
844
rel_url = urlutils.relative_url(medium_base, transport.base)
671
return urllib.unquote(rel_url)
845
return urlutils.unquote(rel_url)
674
848
class SmartClientStreamMedium(SmartClientMedium):
710
884
return SmartClientStreamMediumRequest(self)
887
"""We have been disconnected, reset current state.
889
This resets things like _current_request and connected state.
892
self._current_request = None
713
895
class SmartSimplePipesClientMedium(SmartClientStreamMedium):
714
896
"""A client medium using simple pipes.
724
906
def _accept_bytes(self, bytes):
725
907
"""See SmartClientStreamMedium.accept_bytes."""
726
self._writeable_pipe.write(bytes)
909
self._writeable_pipe.write(bytes)
911
if e.errno in (errno.EINVAL, errno.EPIPE):
912
raise errors.ConnectionReset(
913
"Error trying to write to subprocess", e)
727
915
self._report_activity(len(bytes), 'write')
729
917
def _flush(self):
730
918
"""See SmartClientStreamMedium._flush()."""
919
# Note: If flush were to fail, we'd like to raise ConnectionReset, etc.
920
# However, testing shows that even when the child process is
921
# gone, this doesn't error.
731
922
self._writeable_pipe.flush()
733
924
def _read_bytes(self, count):
753
944
class SmartSSHClientMedium(SmartClientStreamMedium):
754
945
"""A client medium using SSH.
756
It delegates IO to a SmartClientSocketMedium or
947
It delegates IO to a SmartSimplePipesClientMedium or
757
948
SmartClientAlreadyConnectedSocketMedium (depending on platform).
783
974
maybe_port = ':%s' % self._ssh_params.port
784
return "%s(%s://%s@%s%s/)" % (
975
if self._ssh_params.username is None:
978
maybe_user = '%s@' % self._ssh_params.username
979
return "%s(%s://%s%s%s/)" % (
785
980
self.__class__.__name__,
787
self._ssh_params.username,
788
983
self._ssh_params.host,
827
1022
raise AssertionError(
828
1023
"Unexpected io_kind %r from %r"
829
1024
% (io_kind, self._ssh_connection))
1025
for hook in transport.Transport.hooks["post_connect"]:
831
1028
def _flush(self):
832
1029
"""See SmartClientStreamMedium._flush()."""
935
1132
raise errors.ConnectionError("failed to connect to %s:%d: %s" %
936
1133
(self._host, port, err_msg))
937
1134
self._connected = True
1135
for hook in transport.Transport.hooks["post_connect"]:
940
1139
class SmartClientAlreadyConnectedSocketMedium(SmartClientSocketMedium):
added
removed
bzrlib/smart/medium.py
