24
24
bzrlib/transport/smart/__init__.py.
27
from __future__ import absolute_import
35
from bzrlib.lazy_import import lazy_import
36
lazy_import(globals(), """
30
from bzrlib import errors
31
from bzrlib.smart.protocol import SmartServerRequestProtocolOne
34
from bzrlib.transport import ssh
35
except errors.ParamikoNotPresent:
36
# no paramiko. SmartSSHClientMedium will break.
40
class SmartServerStreamMedium(object):
50
from bzrlib.i18n import gettext
51
from bzrlib.smart import client, protocol, request, signals, vfs
52
from bzrlib.transport import ssh
54
from bzrlib import osutils
56
# Throughout this module buffer size parameters are either limited to be at
57
# most _MAX_READ_SIZE, or are ignored and _MAX_READ_SIZE is used instead.
58
# For this module's purposes, MAX_SOCKET_CHUNK is a reasonable size for reads
59
# from non-sockets as well.
60
_MAX_READ_SIZE = osutils.MAX_SOCKET_CHUNK
62
def _get_protocol_factory_for_bytes(bytes):
63
"""Determine the right protocol factory for 'bytes'.
65
This will return an appropriate protocol factory depending on the version
66
of the protocol being used, as determined by inspecting the given bytes.
67
The bytes should have at least one newline byte (i.e. be a whole line),
68
otherwise it's possible that a request will be incorrectly identified as
71
Typical use would be::
73
factory, unused_bytes = _get_protocol_factory_for_bytes(bytes)
74
server_protocol = factory(transport, write_func, root_client_path)
75
server_protocol.accept_bytes(unused_bytes)
77
:param bytes: a str of bytes of the start of the request.
78
:returns: 2-tuple of (protocol_factory, unused_bytes). protocol_factory is
79
a callable that takes three args: transport, write_func,
80
root_client_path. unused_bytes are any bytes that were not part of a
81
protocol version marker.
83
if bytes.startswith(protocol.MESSAGE_VERSION_THREE):
84
protocol_factory = protocol.build_server_protocol_three
85
bytes = bytes[len(protocol.MESSAGE_VERSION_THREE):]
86
elif bytes.startswith(protocol.REQUEST_VERSION_TWO):
87
protocol_factory = protocol.SmartServerRequestProtocolTwo
88
bytes = bytes[len(protocol.REQUEST_VERSION_TWO):]
90
protocol_factory = protocol.SmartServerRequestProtocolOne
91
return protocol_factory, bytes
94
def _get_line(read_bytes_func):
95
"""Read bytes using read_bytes_func until a newline byte.
97
This isn't particularly efficient, so should only be used when the
98
expected size of the line is quite short.
100
:returns: a tuple of two strs: (line, excess)
104
while newline_pos == -1:
105
new_bytes = read_bytes_func(1)
108
# Ran out of bytes before receiving a complete line.
110
newline_pos = bytes.find('\n')
111
line = bytes[:newline_pos+1]
112
excess = bytes[newline_pos+1:]
116
class SmartMedium(object):
117
"""Base class for smart protocol media, both client- and server-side."""
120
self._push_back_buffer = None
122
def _push_back(self, bytes):
123
"""Return unused bytes to the medium, because they belong to the next
126
This sets the _push_back_buffer to the given bytes.
128
if self._push_back_buffer is not None:
129
raise AssertionError(
130
"_push_back called when self._push_back_buffer is %r"
131
% (self._push_back_buffer,))
134
self._push_back_buffer = bytes
136
def _get_push_back_buffer(self):
137
if self._push_back_buffer == '':
138
raise AssertionError(
139
'%s._push_back_buffer should never be the empty string, '
140
'which can be confused with EOF' % (self,))
141
bytes = self._push_back_buffer
142
self._push_back_buffer = None
145
def read_bytes(self, desired_count):
146
"""Read some bytes from this medium.
148
:returns: some bytes, possibly more or less than the number requested
149
in 'desired_count' depending on the medium.
151
if self._push_back_buffer is not None:
152
return self._get_push_back_buffer()
153
bytes_to_read = min(desired_count, _MAX_READ_SIZE)
154
return self._read_bytes(bytes_to_read)
156
def _read_bytes(self, count):
157
raise NotImplementedError(self._read_bytes)
160
"""Read bytes from this request's response until a newline byte.
162
This isn't particularly efficient, so should only be used when the
163
expected size of the line is quite short.
165
:returns: a string of bytes ending in a newline (byte 0x0A).
167
line, excess = _get_line(self.read_bytes)
168
self._push_back(excess)
171
def _report_activity(self, bytes, direction):
172
"""Notify that this medium has activity.
174
Implementations should call this from all methods that actually do IO.
175
Be careful that it's not called twice, if one method is implemented on
178
:param bytes: Number of bytes read or written.
179
:param direction: 'read' or 'write' or None.
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,)
192
class SmartServerStreamMedium(SmartMedium):
41
193
"""Handles smart commands coming over a stream.
43
195
The stream may be a pipe connected to sshd, or a tcp socket, or an
66
231
from sys import stderr
68
233
while not self.finished:
69
protocol = SmartServerRequestProtocolOne(self.backing_transport,
71
self._serve_one_request(protocol)
234
server_protocol = self._build_protocol()
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.
72
242
except Exception, e:
73
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)
270
def _build_protocol(self):
271
"""Identifies the version of the incoming request, and returns an
272
a protocol object that can interpret it.
274
If more bytes than the version prefix of the request are read, they will
275
be fed into the protocol before it is returned.
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
283
bytes = self._get_line()
284
protocol_factory, unused_bytes = _get_protocol_factory_for_bytes(bytes)
285
protocol = protocol_factory(
286
self.backing_transport, self._write_out, self.root_client_path)
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,))
76
321
def _serve_one_request(self, protocol):
77
322
"""Read one request from input, process, send back a response.
79
324
:param protocol: a SmartServerRequestProtocol.
82
329
self._serve_one_request_unguarded(protocol)
83
330
except KeyboardInterrupt:
89
336
"""Called when an unhandled exception from the protocol occurs."""
90
337
raise NotImplementedError(self.terminate_due_to_error)
339
def _read_bytes(self, desired_count):
340
"""Get some bytes from the medium.
342
:param desired_count: number of bytes we want to read.
344
raise NotImplementedError(self._read_bytes)
93
347
class SmartServerSocketStreamMedium(SmartServerStreamMedium):
95
def __init__(self, sock, backing_transport):
349
def __init__(self, sock, backing_transport, root_client_path='/',
98
353
:param sock: the socket the server will read from. It will be put
99
354
into blocking mode.
101
SmartServerStreamMedium.__init__(self, backing_transport)
356
SmartServerStreamMedium.__init__(
357
self, backing_transport, root_client_path=root_client_path,
103
359
sock.setblocking(True)
104
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__,
106
374
def _serve_one_request_unguarded(self, protocol):
107
375
while protocol.next_read_size():
109
protocol.accept_bytes(self.push_back)
112
bytes = self.socket.recv(4096)
116
protocol.accept_bytes(bytes)
118
self.push_back = protocol.excess_buffer
376
# We can safely try to read large chunks. If there is less data
377
# than MAX_SOCKET_CHUNK ready, the socket will just return a
378
# short read immediately rather than block.
379
bytes = self.read_bytes(osutils.MAX_SOCKET_CHUNK)
383
protocol.accept_bytes(bytes)
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)
403
def _read_bytes(self, desired_count):
404
return osutils.read_bytes_from_socket(
405
self.socket, self._report_activity)
120
407
def terminate_due_to_error(self):
121
"""Called when an unhandled exception from the protocol occurs."""
122
408
# TODO: This should log to a server log file, but no such thing
123
409
# exists yet. Andrew Bennetts 2006-09-29.
124
410
self.socket.close()
125
411
self.finished = True
127
413
def _write_out(self, bytes):
128
self.socket.sendall(bytes)
414
tstart = osutils.timer_func()
415
osutils.send_all(self.socket, bytes, self._report_activity)
416
if 'hpss' in debug.debug_flags:
417
thread_id = thread.get_ident()
418
trace.mutter('%12s: [%s] %d bytes to the socket in %.3fs'
419
% ('wrote', thread_id, len(bytes),
420
osutils.timer_func() - tstart))
131
423
class SmartServerPipeStreamMedium(SmartServerStreamMedium):
133
def __init__(self, in_file, out_file, backing_transport):
425
def __init__(self, in_file, out_file, backing_transport, timeout=None):
134
426
"""Construct new server.
136
428
:param in_file: Python file from which requests can be read.
137
429
:param out_file: Python file to write responses.
138
430
:param backing_transport: Transport for the directory served.
140
SmartServerStreamMedium.__init__(self, backing_transport)
432
SmartServerStreamMedium.__init__(self, backing_transport,
141
434
if sys.platform == 'win32':
142
435
# force binary mode for files
280
611
return self._read_bytes(count)
282
613
def _read_bytes(self, count):
283
"""Helper for read_bytes.
614
"""Helper for SmartClientMediumRequest.read_bytes.
285
616
read_bytes checks the state of the request to determing if bytes
286
617
should be read. After that it hands off to _read_bytes to do the
289
raise NotImplementedError(self._read_bytes)
292
class SmartClientMedium(object):
620
By default this forwards to self._medium.read_bytes because we are
621
operating on the medium's stream.
623
return self._medium.read_bytes(count)
626
line = self._read_line()
627
if not line.endswith('\n'):
628
# end of file encountered reading from server
629
raise errors.ConnectionReset(
630
"Unexpected end of message. Please check connectivity "
631
"and permissions, and report a bug if problems persist.")
634
def _read_line(self):
635
"""Helper for SmartClientMediumRequest.read_line.
637
By default this forwards to self._medium._get_line because we are
638
operating on the medium's stream.
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)
662
class _DebugCounter(object):
663
"""An object that counts the HPSS calls made to each client medium.
665
When a medium is garbage-collected, or failing that when
666
bzrlib.global_state exits, the total number of calls made on that medium
667
are reported via trace.note.
671
self.counts = weakref.WeakKeyDictionary()
672
client._SmartClient.hooks.install_named_hook(
673
'call', self.increment_call_count, 'hpss call counter')
674
bzrlib.global_state.cleanups.add_cleanup(self.flush_all)
676
def track(self, medium):
677
"""Start tracking calls made to a medium.
679
This only keeps a weakref to the medium, so shouldn't affect the
682
medium_repr = repr(medium)
683
# Add this medium to the WeakKeyDictionary
684
self.counts[medium] = dict(count=0, vfs_count=0,
685
medium_repr=medium_repr)
686
# Weakref callbacks are fired in reverse order of their association
687
# with the referenced object. So we add a weakref *after* adding to
688
# the WeakKeyDict so that we can report the value from it before the
689
# entry is removed by the WeakKeyDict's own callback.
690
ref = weakref.ref(medium, self.done)
692
def increment_call_count(self, params):
693
# Increment the count in the WeakKeyDictionary
694
value = self.counts[params.medium]
697
request_method = request.request_handlers.get(params.method)
699
# A method we don't know about doesn't count as a VFS method.
701
if issubclass(request_method, vfs.VfsRequest):
702
value['vfs_count'] += 1
705
value = self.counts[ref]
706
count, vfs_count, medium_repr = (
707
value['count'], value['vfs_count'], value['medium_repr'])
708
# In case this callback is invoked for the same ref twice (by the
709
# weakref callback and by the atexit function), set the call count back
710
# to 0 so this item won't be reported twice.
712
value['vfs_count'] = 0
714
trace.note(gettext('HPSS calls: {0} ({1} vfs) {2}').format(
715
count, vfs_count, medium_repr))
718
for ref in list(self.counts.keys()):
721
_debug_counter = None
725
class SmartClientMedium(SmartMedium):
293
726
"""Smart client is a medium for sending smart protocol requests over."""
728
def __init__(self, base):
729
super(SmartClientMedium, self).__init__()
731
self._protocol_version_error = None
732
self._protocol_version = None
733
self._done_hello = False
734
# Be optimistic: we assume the remote end can accept new remote
735
# requests until we get an error saying otherwise.
736
# _remote_version_is_before tracks the bzr version the remote side
737
# can be based on what we've seen so far.
738
self._remote_version_is_before = None
739
# Install debug hook function if debug flag is set.
740
if 'hpss' in debug.debug_flags:
741
global _debug_counter
742
if _debug_counter is None:
743
_debug_counter = _DebugCounter()
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()
750
def _is_remote_before(self, version_tuple):
751
"""Is it possible the remote side supports RPCs for a given version?
755
needed_version = (1, 2)
756
if medium._is_remote_before(needed_version):
757
fallback_to_pre_1_2_rpc()
761
except UnknownSmartMethod:
762
medium._remember_remote_is_before(needed_version)
763
fallback_to_pre_1_2_rpc()
765
:seealso: _remember_remote_is_before
767
if self._remote_version_is_before is None:
768
# So far, the remote side seems to support everything
770
return version_tuple >= self._remote_version_is_before
772
def _remember_remote_is_before(self, version_tuple):
773
"""Tell this medium that the remote side is older the given version.
775
:seealso: _is_remote_before
777
if (self._remote_version_is_before is not None and
778
version_tuple > self._remote_version_is_before):
779
# We have been told that the remote side is older than some version
780
# which is newer than a previously supplied older-than version.
781
# This indicates that some smart verb call is not guarded
782
# appropriately (it should simply not have been tried).
784
"_remember_remote_is_before(%r) called, but "
785
"_remember_remote_is_before(%r) was called previously."
786
, version_tuple, self._remote_version_is_before)
787
if 'hpss' in debug.debug_flags:
788
ui.ui_factory.show_warning(
789
"_remember_remote_is_before(%r) called, but "
790
"_remember_remote_is_before(%r) was called previously."
791
% (version_tuple, self._remote_version_is_before))
793
self._remote_version_is_before = version_tuple
795
def protocol_version(self):
796
"""Find out if 'hello' smart request works."""
797
if self._protocol_version_error is not None:
798
raise self._protocol_version_error
799
if not self._done_hello:
801
medium_request = self.get_request()
802
# Send a 'hello' request in protocol version one, for maximum
803
# backwards compatibility.
804
client_protocol = protocol.SmartClientRequestProtocolOne(medium_request)
805
client_protocol.query_version()
806
self._done_hello = True
807
except errors.SmartProtocolError, e:
808
# Cache the error, just like we would cache a successful
810
self._protocol_version_error = e
814
def should_probe(self):
815
"""Should RemoteBzrDirFormat.probe_transport send a smart request on
818
Some transports are unambiguously smart-only; there's no need to check
819
if the transport is able to carry smart requests, because that's all
820
it is for. In those cases, this method should return False.
822
But some HTTP transports can sometimes fail to carry smart requests,
823
but still be usuable for accessing remote bzrdirs via plain file
824
accesses. So for those transports, their media should return True here
825
so that RemoteBzrDirFormat can determine if it is appropriate for that
295
830
def disconnect(self):
296
831
"""If this medium maintains a persistent connection, close it.
298
833
The default implementation does nothing.
836
def remote_path_from_transport(self, transport):
837
"""Convert transport into a path suitable for using in a request.
839
Note that the resulting remote path doesn't encode the host name or
840
anything but path, so it is only safe to use it in requests sent over
841
the medium from the matching transport.
843
medium_base = urlutils.join(self.base, '/')
844
rel_url = urlutils.relative_url(medium_base, transport.base)
845
return urlutils.unquote(rel_url)
302
848
class SmartClientStreamMedium(SmartClientMedium):
303
849
"""Stream based medium common class.
337
884
return SmartClientStreamMediumRequest(self)
339
def read_bytes(self, count):
340
return self._read_bytes(count)
887
"""We have been disconnected, reset current state.
889
This resets things like _current_request and connected state.
892
self._current_request = None
343
895
class SmartSimplePipesClientMedium(SmartClientStreamMedium):
344
896
"""A client medium using simple pipes.
346
898
This client does not manage the pipes: it assumes they will always be open.
349
def __init__(self, readable_pipe, writeable_pipe):
350
SmartClientStreamMedium.__init__(self)
901
def __init__(self, readable_pipe, writeable_pipe, base):
902
SmartClientStreamMedium.__init__(self, base)
351
903
self._readable_pipe = readable_pipe
352
904
self._writeable_pipe = writeable_pipe
354
906
def _accept_bytes(self, bytes):
355
907
"""See SmartClientStreamMedium.accept_bytes."""
356
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)
915
self._report_activity(len(bytes), 'write')
358
917
def _flush(self):
359
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.
360
922
self._writeable_pipe.flush()
362
924
def _read_bytes(self, count):
363
925
"""See SmartClientStreamMedium._read_bytes."""
364
return self._readable_pipe.read(count)
926
bytes_to_read = min(count, _MAX_READ_SIZE)
927
bytes = self._readable_pipe.read(bytes_to_read)
928
self._report_activity(len(bytes), 'read')
932
class SSHParams(object):
933
"""A set of parameters for starting a remote bzr via SSH."""
935
def __init__(self, host, port=None, username=None, password=None,
936
bzr_remote_path='bzr'):
939
self.username = username
940
self.password = password
941
self.bzr_remote_path = bzr_remote_path
367
944
class SmartSSHClientMedium(SmartClientStreamMedium):
368
"""A client medium using SSH."""
370
def __init__(self, host, port=None, username=None, password=None,
945
"""A client medium using SSH.
947
It delegates IO to a SmartSimplePipesClientMedium or
948
SmartClientAlreadyConnectedSocketMedium (depending on platform).
951
def __init__(self, base, ssh_params, vendor=None):
372
952
"""Creates a client that will connect on the first use.
954
:param ssh_params: A SSHParams instance.
374
955
:param vendor: An optional override for the ssh vendor to use. See
375
956
bzrlib.transport.ssh for details on ssh vendors.
377
SmartClientStreamMedium.__init__(self)
378
self._connected = False
380
self._password = password
382
self._username = username
383
self._read_from = None
958
self._real_medium = None
959
self._ssh_params = ssh_params
960
# for the benefit of progress making a short description of this
962
self._scheme = 'bzr+ssh'
963
# SmartClientStreamMedium stores the repr of this object in its
964
# _DebugCounter so we have to store all the values used in our repr
965
# method before calling the super init.
966
SmartClientStreamMedium.__init__(self, base)
967
self._vendor = vendor
384
968
self._ssh_connection = None
385
self._vendor = vendor
386
self._write_to = None
971
if self._ssh_params.port is None:
974
maybe_port = ':%s' % self._ssh_params.port
975
if self._ssh_params.username is None:
978
maybe_user = '%s@' % self._ssh_params.username
979
return "%s(%s://%s%s%s/)" % (
980
self.__class__.__name__,
983
self._ssh_params.host,
388
986
def _accept_bytes(self, bytes):
389
987
"""See SmartClientStreamMedium.accept_bytes."""
390
988
self._ensure_connection()
391
self._write_to.write(bytes)
989
self._real_medium.accept_bytes(bytes)
393
991
def disconnect(self):
394
992
"""See SmartClientMedium.disconnect()."""
395
if not self._connected:
397
self._read_from.close()
398
self._write_to.close()
399
self._ssh_connection.close()
400
self._connected = False
993
if self._real_medium is not None:
994
self._real_medium.disconnect()
995
self._real_medium = None
996
if self._ssh_connection is not None:
997
self._ssh_connection.close()
998
self._ssh_connection = None
402
1000
def _ensure_connection(self):
403
1001
"""Connect this medium if not already connected."""
1002
if self._real_medium is not None:
406
executable = os.environ.get('BZR_REMOTE_PATH', 'bzr')
407
1004
if self._vendor is None:
408
1005
vendor = ssh._get_ssh_vendor()
410
1007
vendor = self._vendor
411
self._ssh_connection = vendor.connect_ssh(self._username,
412
self._password, self._host, self._port,
413
command=[executable, 'serve', '--inet', '--directory=/',
415
self._read_from, self._write_to = \
416
self._ssh_connection.get_filelike_channels()
417
self._connected = True
1008
self._ssh_connection = vendor.connect_ssh(self._ssh_params.username,
1009
self._ssh_params.password, self._ssh_params.host,
1010
self._ssh_params.port,
1011
command=[self._ssh_params.bzr_remote_path, 'serve', '--inet',
1012
'--directory=/', '--allow-writes'])
1013
io_kind, io_object = self._ssh_connection.get_sock_or_pipes()
1014
if io_kind == 'socket':
1015
self._real_medium = SmartClientAlreadyConnectedSocketMedium(
1016
self.base, io_object)
1017
elif io_kind == 'pipes':
1018
read_from, write_to = io_object
1019
self._real_medium = SmartSimplePipesClientMedium(
1020
read_from, write_to, self.base)
1022
raise AssertionError(
1023
"Unexpected io_kind %r from %r"
1024
% (io_kind, self._ssh_connection))
1025
for hook in transport.Transport.hooks["post_connect"]:
419
1028
def _flush(self):
420
1029
"""See SmartClientStreamMedium._flush()."""
421
self._write_to.flush()
1030
self._real_medium._flush()
423
1032
def _read_bytes(self, count):
424
1033
"""See SmartClientStreamMedium.read_bytes."""
425
if not self._connected:
1034
if self._real_medium is None:
426
1035
raise errors.MediumNotConnected(self)
427
return self._read_from.read(count)
430
class SmartTCPClientMedium(SmartClientStreamMedium):
431
"""A client medium using TCP."""
433
def __init__(self, host, port):
434
"""Creates a client that will connect on the first use."""
435
SmartClientStreamMedium.__init__(self)
1036
return self._real_medium.read_bytes(count)
1039
# Port 4155 is the default port for bzr://, registered with IANA.
1040
BZR_DEFAULT_INTERFACE = None
1041
BZR_DEFAULT_PORT = 4155
1044
class SmartClientSocketMedium(SmartClientStreamMedium):
1045
"""A client medium using a socket.
1047
This class isn't usable directly. Use one of its subclasses instead.
1050
def __init__(self, base):
1051
SmartClientStreamMedium.__init__(self, base)
436
1053
self._connected = False
441
1055
def _accept_bytes(self, bytes):
442
1056
"""See SmartClientMedium.accept_bytes."""
443
1057
self._ensure_connection()
444
self._socket.sendall(bytes)
1058
osutils.send_all(self._socket, bytes, self._report_activity)
1060
def _ensure_connection(self):
1061
"""Connect this medium if not already connected."""
1062
raise NotImplementedError(self._ensure_connection)
1065
"""See SmartClientStreamMedium._flush().
1067
For sockets we do no flushing. For TCP sockets we may want to turn off
1068
TCP_NODELAY and add a means to do a flush, but that can be done in the
1072
def _read_bytes(self, count):
1073
"""See SmartClientMedium.read_bytes."""
1074
if not self._connected:
1075
raise errors.MediumNotConnected(self)
1076
return osutils.read_bytes_from_socket(
1077
self._socket, self._report_activity)
446
1079
def disconnect(self):
447
1080
"""See SmartClientMedium.disconnect()."""
451
1084
self._socket = None
452
1085
self._connected = False
1088
class SmartTCPClientMedium(SmartClientSocketMedium):
1089
"""A client medium that creates a TCP connection."""
1091
def __init__(self, host, port, base):
1092
"""Creates a client that will connect on the first use."""
1093
SmartClientSocketMedium.__init__(self, base)
454
1097
def _ensure_connection(self):
455
1098
"""Connect this medium if not already connected."""
456
1099
if self._connected:
458
self._socket = socket.socket()
459
self._socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
460
result = self._socket.connect_ex((self._host, int(self._port)))
1101
if self._port is None:
1102
port = BZR_DEFAULT_PORT
1104
port = int(self._port)
1106
sockaddrs = socket.getaddrinfo(self._host, port, socket.AF_UNSPEC,
1107
socket.SOCK_STREAM, 0, 0)
1108
except socket.gaierror, (err_num, err_msg):
1109
raise errors.ConnectionError("failed to lookup %s:%d: %s" %
1110
(self._host, port, err_msg))
1111
# Initialize err in case there are no addresses returned:
1112
err = socket.error("no address found for %s" % self._host)
1113
for (family, socktype, proto, canonname, sockaddr) in sockaddrs:
1115
self._socket = socket.socket(family, socktype, proto)
1116
self._socket.setsockopt(socket.IPPROTO_TCP,
1117
socket.TCP_NODELAY, 1)
1118
self._socket.connect(sockaddr)
1119
except socket.error, err:
1120
if self._socket is not None:
1121
self._socket.close()
1125
if self._socket is None:
1126
# socket errors either have a (string) or (errno, string) as their
1128
if type(err.args) is str:
1131
err_msg = err.args[1]
462
1132
raise errors.ConnectionError("failed to connect to %s:%d: %s" %
463
(self._host, self._port, os.strerror(result)))
464
self._connected = True
467
"""See SmartClientStreamMedium._flush().
469
For TCP we do no flushing. We may want to turn off TCP_NODELAY and
470
add a means to do a flush, but that can be done in the future.
473
def _read_bytes(self, count):
474
"""See SmartClientMedium.read_bytes."""
475
if not self._connected:
476
raise errors.MediumNotConnected(self)
477
return self._socket.recv(count)
1133
(self._host, port, err_msg))
1134
self._connected = True
1135
for hook in transport.Transport.hooks["post_connect"]:
1139
class SmartClientAlreadyConnectedSocketMedium(SmartClientSocketMedium):
1140
"""A client medium for an already connected socket.
1142
Note that this class will assume it "owns" the socket, so it will close it
1143
when its disconnect method is called.
1146
def __init__(self, base, sock):
1147
SmartClientSocketMedium.__init__(self, base)
1149
self._connected = True
1151
def _ensure_connection(self):
1152
# Already connected, by definition! So nothing to do.
480
1156
class SmartClientStreamMediumRequest(SmartClientMediumRequest):
added
removed
bzrlib/smart/medium.py
