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13
# You should have received a copy of the GNU General Public License
14
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Infrastructure for server-side request handlers.
19
Interesting module attributes:
20
* The request_handlers registry maps verb names to SmartServerRequest
22
* The jail_info threading.local() object is used to prevent accidental
23
opening of BzrDirs outside of the backing transport, or any other
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transports placed in jail_info.transports. The jail_info is reset on
25
every call into a request handler (which can happen an arbitrary number
26
of times during a request).
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# XXX: The class names are a little confusing: the protocol will instantiate a
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# SmartServerRequestHandler, whose dispatch_command method creates an instance
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# of a SmartServerRequest subclass.
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""Basic server-side logic for dealing with requests."""
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22
from bzrlib import (
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from bzrlib.lazy_import import lazy_import
47
lazy_import(globals(), """
48
from bzrlib.bundle import serializer
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jail_info = threading.local()
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jail_info.transports = None
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bzrdir.BzrDir.hooks.install_named_hook(
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'pre_open', _pre_open_hook, 'checking server jail')
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def _pre_open_hook(transport):
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allowed_transports = getattr(jail_info, 'transports', None)
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if allowed_transports is None:
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abspath = transport.base
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for allowed_transport in allowed_transports:
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allowed_transport.relpath(abspath)
72
except errors.PathNotChild:
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raise errors.JailBreak(abspath)
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from bzrlib.bundle.serializer import write_bundle
82
31
class SmartServerRequest(object):
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"""Base class for request handlers.
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To define a new request, subclass this class and override the `do` method
86
(and if appropriate, `do_body` as well). Request implementors should take
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care to call `translate_client_path` and `transport_from_client_path` as
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appropriate when dealing with paths received from the client.
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# XXX: rename this class to BaseSmartServerRequestHandler ? A request
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# *handler* is a different concept to the request.
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def __init__(self, backing_transport, root_client_path='/', jail_root=None):
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"""Base class for request handlers."""
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def __init__(self, backing_transport):
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37
:param backing_transport: the base transport to be used when performing
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:param root_client_path: the client path that maps to the root of
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backing_transport. This is used to interpret relpaths received
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from the client. Clients will not be able to refer to paths above
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this root. If root_client_path is None, then no translation will
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be performed on client paths. Default is '/'.
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:param jail_root: if specified, the root of the BzrDir.open jail to use
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instead of backing_transport.
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40
self._backing_transport = backing_transport
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if jail_root is None:
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jail_root = backing_transport
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self._jail_root = jail_root
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if root_client_path is not None:
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if not root_client_path.startswith('/'):
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root_client_path = '/' + root_client_path
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if not root_client_path.endswith('/'):
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root_client_path += '/'
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self._root_client_path = root_client_path
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self._body_chunks = []
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42
def _check_enabled(self):
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43
"""Raises DisabledMethod if this method is disabled."""
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59
It will return a SmartServerResponse if the command does not expect a
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:param args: the arguments of the request.
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:param *args: the arguments of the request.
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self._check_enabled()
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return self.do(*args)
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67
def do_body(self, body_bytes):
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68
"""Called if the client sends a body with the request.
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The do() method is still called, and must have returned None.
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70
Must return a SmartServerResponse.
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raise errors.SmartProtocolError('Request does not expect a body')
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def do_chunk(self, chunk_bytes):
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"""Called with each body chunk if the request has a streamed body.
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The do() method is still called, and must have returned None.
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self._body_chunks.append(chunk_bytes)
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"""Called when the end of the request has been received."""
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body_bytes = ''.join(self._body_chunks)
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self._body_chunks = None
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return self.do_body(body_bytes)
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def setup_jail(self):
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jail_info.transports = [self._jail_root]
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def teardown_jail(self):
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jail_info.transports = None
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def translate_client_path(self, client_path):
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"""Translate a path received from a network client into a local
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All paths received from the client *must* be translated.
178
:param client_path: the path from the client.
179
:returns: a relpath that may be used with self._backing_transport
180
(unlike the untranslated client_path, which must not be used with
181
the backing transport).
183
if self._root_client_path is None:
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# no translation necessary!
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if not client_path.startswith('/'):
187
client_path = '/' + client_path
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if client_path + '/' == self._root_client_path:
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if client_path.startswith(self._root_client_path):
191
path = client_path[len(self._root_client_path):]
192
relpath = urlutils.joinpath('/', path)
193
if not relpath.startswith('/'):
194
raise ValueError(relpath)
195
return urlutils.escape('.' + relpath)
197
raise errors.PathNotChild(client_path, self._root_client_path)
199
def transport_from_client_path(self, client_path):
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"""Get a backing transport corresponding to the location referred to by
203
:seealso: translate_client_path
204
:returns: a transport cloned from self._backing_transport
206
relpath = self.translate_client_path(client_path)
207
return self._backing_transport.clone(relpath)
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# TODO: if a client erroneously sends a request that shouldn't have a
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# body, what to do? Probably SmartServerRequestHandler should catch
74
# this NotImplementedError and translate it into a 'bad request' error
75
# to send to the client.
76
raise NotImplementedError(self.do_body)
210
79
class SmartServerResponse(object):
211
"""A response to a client request.
213
This base class should not be used. Instead use
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SuccessfulSmartServerResponse and FailedSmartServerResponse as appropriate.
217
def __init__(self, args, body=None, body_stream=None):
220
:param args: tuple of response arguments.
221
:param body: string of a response body.
222
:param body_stream: iterable of bytestrings to be streamed to the
80
"""Response generated by SmartServerRequestHandler."""
82
def __init__(self, args, body=None):
226
if body is not None and body_stream is not None:
227
raise errors.BzrError(
228
"'body' and 'body_stream' are mutually exclusive.")
230
self.body_stream = body_stream
232
86
def __eq__(self, other):
235
return (other.args == self.args and
236
other.body == self.body and
237
other.body_stream is self.body_stream)
89
return other.args == self.args and other.body == self.body
239
91
def __repr__(self):
240
return "<%s args=%r body=%r>" % (self.__class__.__name__,
241
self.args, self.body)
244
class FailedSmartServerResponse(SmartServerResponse):
245
"""A SmartServerResponse for a request which failed."""
247
def is_successful(self):
248
"""FailedSmartServerResponse are not successful."""
252
class SuccessfulSmartServerResponse(SmartServerResponse):
253
"""A SmartServerResponse for a successfully completed request."""
255
def is_successful(self):
256
"""SuccessfulSmartServerResponse are successful."""
92
return "<SmartServerResponse args=%r body=%r>" % (self.args, self.body)
260
95
class SmartServerRequestHandler(object):
261
96
"""Protocol logic for smart server.
263
98
This doesn't handle serialization at all, it just processes requests and
264
99
creates responses.
283
117
subclasses. e.g. bzrlib.transport.smart.vfs.vfs_commands.
285
119
self._backing_transport = backing_transport
286
self._root_client_path = root_client_path
287
120
self._commands = commands
288
if jail_root is None:
289
jail_root = backing_transport
290
self._jail_root = jail_root
121
self._body_bytes = ''
291
122
self.response = None
292
123
self.finished_reading = False
293
124
self._command = None
294
if 'hpss' in debug.debug_flags:
295
self._request_start_time = osutils.timer_func()
296
self._thread_id = thread.get_ident()
298
def _trace(self, action, message, extra_bytes=None, include_time=False):
299
# It is a bit of a shame that this functionality overlaps with that of
300
# ProtocolThreeRequester._trace. However, there is enough difference
301
# that just putting it in a helper doesn't help a lot. And some state
302
# is taken from the instance.
304
t = '%5.3fs ' % (osutils.timer_func() - self._request_start_time)
307
if extra_bytes is None:
310
extra = ' ' + repr(extra_bytes[:40])
312
extra = extra[:29] + extra[-1] + '...'
313
trace.mutter('%12s: [%s] %s%s%s'
314
% (action, self._thread_id, t, message, extra))
316
126
def accept_body(self, bytes):
317
127
"""Accept body data."""
318
if self._command is None:
319
# no active command object, so ignore the event.
321
self._run_handler_code(self._command.do_chunk, (bytes,), {})
322
if 'hpss' in debug.debug_flags:
323
self._trace('accept body',
324
'%d bytes' % (len(bytes),), bytes)
129
# TODO: This should be overriden for each command that desired body data
130
# to handle the right format of that data, i.e. plain bytes, a bundle,
131
# etc. The deserialisation into that format should be done in the
134
# default fallback is to accumulate bytes.
135
self._body_bytes += bytes
326
137
def end_of_body(self):
327
138
"""No more body data will be received."""
328
self._run_handler_code(self._command.do_end, (), {})
139
self._run_handler_code(self._command.do_body, (self._body_bytes,), {})
329
140
# cannot read after this.
330
141
self.finished_reading = True
331
if 'hpss' in debug.debug_flags:
332
self._trace('end of body', '', include_time=True)
143
def dispatch_command(self, cmd, args):
144
"""Deprecated compatibility method.""" # XXX XXX
146
command = self._commands.get(cmd)
148
raise errors.SmartProtocolError("bad request %r" % (cmd,))
149
self._command = command(self._backing_transport)
150
self._run_handler_code(self._command.execute, args, {})
334
152
def _run_handler_code(self, callable, args, kwargs):
335
153
"""Run some handler specific code 'callable'.
351
169
# XXX: most of this error conversion is VFS-related, and thus ought to
352
170
# be in SmartServerVFSRequestHandler somewhere.
354
self._command.setup_jail()
356
return callable(*args, **kwargs)
358
self._command.teardown_jail()
359
except (KeyboardInterrupt, SystemExit):
361
except Exception, err:
362
err_struct = _translate_error(err)
363
return FailedSmartServerResponse(err_struct)
365
def headers_received(self, headers):
366
# Just a no-op at the moment.
367
if 'hpss' in debug.debug_flags:
368
self._trace('headers', repr(headers))
370
def args_received(self, args):
374
command = self._commands.get(cmd)
376
if 'hpss' in debug.debug_flags:
377
self._trace('hpss unknown request',
378
cmd, repr(args)[1:-1])
379
raise errors.UnknownSmartMethod(cmd)
380
if 'hpss' in debug.debug_flags:
381
from bzrlib.smart import vfs
382
if issubclass(command, vfs.VfsRequest):
383
action = 'hpss vfs req'
385
action = 'hpss request'
387
'%s %s' % (cmd, repr(args)[1:-1]))
388
self._command = command(
389
self._backing_transport, self._root_client_path, self._jail_root)
390
self._run_handler_code(self._command.execute, args, {})
392
def end_received(self):
393
if self._command is None:
394
# no active command object, so ignore the event.
396
self._run_handler_code(self._command.do_end, (), {})
397
if 'hpss' in debug.debug_flags:
398
self._trace('end', '', include_time=True)
400
def post_body_error_received(self, error_args):
401
# Just a no-op at the moment.
405
def _translate_error(err):
406
if isinstance(err, errors.NoSuchFile):
407
return ('NoSuchFile', err.path)
408
elif isinstance(err, errors.FileExists):
409
return ('FileExists', err.path)
410
elif isinstance(err, errors.DirectoryNotEmpty):
411
return ('DirectoryNotEmpty', err.path)
412
elif isinstance(err, errors.IncompatibleRepositories):
413
return ('IncompatibleRepositories', str(err.source), str(err.target),
415
elif isinstance(err, errors.ShortReadvError):
416
return ('ShortReadvError', err.path, str(err.offset), str(err.length),
418
elif isinstance(err, errors.UnstackableRepositoryFormat):
419
return (('UnstackableRepositoryFormat', str(err.format), err.url))
420
elif isinstance(err, errors.UnstackableBranchFormat):
421
return ('UnstackableBranchFormat', str(err.format), err.url)
422
elif isinstance(err, errors.NotStacked):
423
return ('NotStacked',)
424
elif isinstance(err, UnicodeError):
425
# If it is a DecodeError, than most likely we are starting
426
# with a plain string
427
str_or_unicode = err.object
428
if isinstance(str_or_unicode, unicode):
429
# XXX: UTF-8 might have \x01 (our protocol v1 and v2 seperator
430
# byte) in it, so this encoding could cause broken responses.
431
# Newer clients use protocol v3, so will be fine.
432
val = 'u:' + str_or_unicode.encode('utf-8')
434
val = 's:' + str_or_unicode.encode('base64')
435
# This handles UnicodeEncodeError or UnicodeDecodeError
436
return (err.__class__.__name__, err.encoding, val, str(err.start),
437
str(err.end), err.reason)
438
elif isinstance(err, errors.TransportNotPossible):
439
if err.msg == "readonly transport":
440
return ('ReadOnlyError', )
441
elif isinstance(err, errors.ReadError):
442
# cannot read the file
443
return ('ReadError', err.path)
444
elif isinstance(err, errors.PermissionDenied):
445
return ('PermissionDenied', err.path, err.extra)
446
elif isinstance(err, errors.TokenMismatch):
447
return ('TokenMismatch', err.given_token, err.lock_token)
448
elif isinstance(err, errors.LockContention):
449
return ('LockContention',)
450
elif isinstance(err, MemoryError):
451
# GZ 2011-02-24: Copy bzrlib.trace -Dmem_dump functionality here?
452
return ('MemoryError',)
453
# Unserialisable error. Log it, and return a generic error
454
trace.log_exception_quietly()
455
return ('error', trace._qualified_exception_name(err.__class__, True),
172
return callable(*args, **kwargs)
173
except errors.NoSuchFile, e:
174
return SmartServerResponse(('NoSuchFile', e.path))
175
except errors.FileExists, e:
176
return SmartServerResponse(('FileExists', e.path))
177
except errors.DirectoryNotEmpty, e:
178
return SmartServerResponse(('DirectoryNotEmpty', e.path))
179
except errors.ShortReadvError, e:
180
return SmartServerResponse(('ShortReadvError',
181
e.path, str(e.offset), str(e.length), str(e.actual)))
182
except UnicodeError, e:
183
# If it is a DecodeError, than most likely we are starting
184
# with a plain string
185
str_or_unicode = e.object
186
if isinstance(str_or_unicode, unicode):
187
# XXX: UTF-8 might have \x01 (our seperator byte) in it. We
188
# should escape it somehow.
189
val = 'u:' + str_or_unicode.encode('utf-8')
191
val = 's:' + str_or_unicode.encode('base64')
192
# This handles UnicodeEncodeError or UnicodeDecodeError
193
return SmartServerResponse((e.__class__.__name__,
194
e.encoding, val, str(e.start), str(e.end), e.reason))
195
except errors.TransportNotPossible, e:
196
if e.msg == "readonly transport":
197
return SmartServerResponse(('ReadOnlyError', ))
459
202
class HelloRequest(SmartServerRequest):
460
"""Answer a version request with the highest protocol version this server
203
"""Answer a version request with my version."""
465
return SuccessfulSmartServerResponse(('ok', '2'))
206
return SmartServerResponse(('ok', '1'))
468
209
class GetBundleRequest(SmartServerRequest):
491
return SuccessfulSmartServerResponse((answer,))
232
return SmartServerResponse((answer,))
494
235
request_handlers = registry.Registry()
495
236
request_handlers.register_lazy(
496
237
'append', 'bzrlib.smart.vfs', 'AppendRequest')
497
238
request_handlers.register_lazy(
498
'Branch.get_config_file', 'bzrlib.smart.branch',
499
'SmartServerBranchGetConfigFile')
500
request_handlers.register_lazy(
501
'Branch.get_parent', 'bzrlib.smart.branch', 'SmartServerBranchGetParent')
502
request_handlers.register_lazy(
503
'Branch.get_tags_bytes', 'bzrlib.smart.branch',
504
'SmartServerBranchGetTagsBytes')
505
request_handlers.register_lazy(
506
'Branch.set_tags_bytes', 'bzrlib.smart.branch',
507
'SmartServerBranchSetTagsBytes')
508
request_handlers.register_lazy(
509
'Branch.heads_to_fetch', 'bzrlib.smart.branch',
510
'SmartServerBranchHeadsToFetch')
511
request_handlers.register_lazy(
512
'Branch.get_stacked_on_url', 'bzrlib.smart.branch', 'SmartServerBranchRequestGetStackedOnURL')
513
request_handlers.register_lazy(
514
'Branch.last_revision_info', 'bzrlib.smart.branch', 'SmartServerBranchRequestLastRevisionInfo')
515
request_handlers.register_lazy(
516
'Branch.lock_write', 'bzrlib.smart.branch', 'SmartServerBranchRequestLockWrite')
517
request_handlers.register_lazy( 'Branch.revision_history',
518
'bzrlib.smart.branch', 'SmartServerRequestRevisionHistory')
519
request_handlers.register_lazy( 'Branch.set_config_option',
520
'bzrlib.smart.branch', 'SmartServerBranchRequestSetConfigOption')
521
request_handlers.register_lazy( 'Branch.set_config_option_dict',
522
'bzrlib.smart.branch', 'SmartServerBranchRequestSetConfigOptionDict')
523
request_handlers.register_lazy( 'Branch.set_last_revision',
524
'bzrlib.smart.branch', 'SmartServerBranchRequestSetLastRevision')
525
request_handlers.register_lazy(
526
'Branch.set_last_revision_info', 'bzrlib.smart.branch',
527
'SmartServerBranchRequestSetLastRevisionInfo')
528
request_handlers.register_lazy(
529
'Branch.set_last_revision_ex', 'bzrlib.smart.branch',
530
'SmartServerBranchRequestSetLastRevisionEx')
531
request_handlers.register_lazy(
532
'Branch.set_parent_location', 'bzrlib.smart.branch',
533
'SmartServerBranchRequestSetParentLocation')
534
request_handlers.register_lazy(
535
'Branch.unlock', 'bzrlib.smart.branch', 'SmartServerBranchRequestUnlock')
536
request_handlers.register_lazy(
537
'BzrDir.cloning_metadir', 'bzrlib.smart.bzrdir',
538
'SmartServerBzrDirRequestCloningMetaDir')
539
request_handlers.register_lazy(
540
'BzrDir.create_branch', 'bzrlib.smart.bzrdir',
541
'SmartServerRequestCreateBranch')
542
request_handlers.register_lazy(
543
'BzrDir.create_repository', 'bzrlib.smart.bzrdir',
544
'SmartServerRequestCreateRepository')
545
request_handlers.register_lazy(
546
'BzrDir.find_repository', 'bzrlib.smart.bzrdir',
547
'SmartServerRequestFindRepositoryV1')
548
request_handlers.register_lazy(
549
'BzrDir.find_repositoryV2', 'bzrlib.smart.bzrdir',
550
'SmartServerRequestFindRepositoryV2')
551
request_handlers.register_lazy(
552
'BzrDir.find_repositoryV3', 'bzrlib.smart.bzrdir',
553
'SmartServerRequestFindRepositoryV3')
554
request_handlers.register_lazy(
555
'BzrDir.get_config_file', 'bzrlib.smart.bzrdir',
556
'SmartServerBzrDirRequestConfigFile')
557
request_handlers.register_lazy(
558
'BzrDirFormat.initialize', 'bzrlib.smart.bzrdir',
559
'SmartServerRequestInitializeBzrDir')
560
request_handlers.register_lazy(
561
'BzrDirFormat.initialize_ex_1.16', 'bzrlib.smart.bzrdir',
562
'SmartServerRequestBzrDirInitializeEx')
563
request_handlers.register_lazy(
564
'BzrDir.open', 'bzrlib.smart.bzrdir', 'SmartServerRequestOpenBzrDir')
565
request_handlers.register_lazy(
566
'BzrDir.open_2.1', 'bzrlib.smart.bzrdir', 'SmartServerRequestOpenBzrDir_2_1')
567
request_handlers.register_lazy(
568
'BzrDir.open_branch', 'bzrlib.smart.bzrdir',
569
'SmartServerRequestOpenBranch')
570
request_handlers.register_lazy(
571
'BzrDir.open_branchV2', 'bzrlib.smart.bzrdir',
572
'SmartServerRequestOpenBranchV2')
573
request_handlers.register_lazy(
574
'BzrDir.open_branchV3', 'bzrlib.smart.bzrdir',
575
'SmartServerRequestOpenBranchV3')
576
request_handlers.register_lazy(
577
239
'delete', 'bzrlib.smart.vfs', 'DeleteRequest')
578
240
request_handlers.register_lazy(
579
241
'get', 'bzrlib.smart.vfs', 'GetRequest')
600
262
request_handlers.register_lazy(
601
263
'rename', 'bzrlib.smart.vfs', 'RenameRequest')
602
264
request_handlers.register_lazy(
603
'PackRepository.autopack', 'bzrlib.smart.packrepository',
604
'SmartServerPackRepositoryAutopack')
605
request_handlers.register_lazy('Repository.gather_stats',
606
'bzrlib.smart.repository',
607
'SmartServerRepositoryGatherStats')
608
request_handlers.register_lazy('Repository.get_parent_map',
609
'bzrlib.smart.repository',
610
'SmartServerRepositoryGetParentMap')
611
request_handlers.register_lazy(
612
'Repository.get_revision_graph', 'bzrlib.smart.repository', 'SmartServerRepositoryGetRevisionGraph')
613
request_handlers.register_lazy(
614
'Repository.has_revision', 'bzrlib.smart.repository', 'SmartServerRequestHasRevision')
615
request_handlers.register_lazy(
616
'Repository.insert_stream', 'bzrlib.smart.repository', 'SmartServerRepositoryInsertStream')
617
request_handlers.register_lazy(
618
'Repository.insert_stream_1.19', 'bzrlib.smart.repository', 'SmartServerRepositoryInsertStream_1_19')
619
request_handlers.register_lazy(
620
'Repository.insert_stream_locked', 'bzrlib.smart.repository', 'SmartServerRepositoryInsertStreamLocked')
621
request_handlers.register_lazy(
622
'Repository.is_shared', 'bzrlib.smart.repository', 'SmartServerRepositoryIsShared')
623
request_handlers.register_lazy(
624
'Repository.lock_write', 'bzrlib.smart.repository', 'SmartServerRepositoryLockWrite')
625
request_handlers.register_lazy(
626
'Repository.set_make_working_trees', 'bzrlib.smart.repository',
627
'SmartServerRepositorySetMakeWorkingTrees')
628
request_handlers.register_lazy(
629
'Repository.unlock', 'bzrlib.smart.repository', 'SmartServerRepositoryUnlock')
630
request_handlers.register_lazy(
631
'Repository.get_rev_id_for_revno', 'bzrlib.smart.repository',
632
'SmartServerRepositoryGetRevIdForRevno')
633
request_handlers.register_lazy(
634
'Repository.get_stream', 'bzrlib.smart.repository',
635
'SmartServerRepositoryGetStream')
636
request_handlers.register_lazy(
637
'Repository.get_stream_1.19', 'bzrlib.smart.repository',
638
'SmartServerRepositoryGetStream_1_19')
639
request_handlers.register_lazy(
640
'Repository.tarball', 'bzrlib.smart.repository',
641
'SmartServerRepositoryTarball')
642
request_handlers.register_lazy(
643
265
'rmdir', 'bzrlib.smart.vfs', 'RmdirRequest')
644
266
request_handlers.register_lazy(
645
267
'stat', 'bzrlib.smart.vfs', 'StatRequest')
646
request_handlers.register_lazy(
647
'Transport.is_readonly', 'bzrlib.smart.request', 'SmartServerIsReadonly')
added
removed
bzrlib/smart/request.py
