26
from bzrlib.hooks import Hooks
25
from bzrlib.hooks import HookPoint, Hooks
27
26
from bzrlib import (
30
29
transport as _mod_transport,
32
from bzrlib.i18n import gettext
33
31
from bzrlib.lazy_import import lazy_import
34
32
lazy_import(globals(), """
35
from bzrlib.smart import (
33
from bzrlib.smart import medium
39
34
from bzrlib.transport import (
43
38
from bzrlib import (
56
50
hooks: An instance of SmartServerHooks.
59
# This is the timeout on the socket we use .accept() on. It is exposed here
60
# so the test suite can set it faster. (It thread.interrupt_main() will not
61
# fire a KeyboardInterrupt during socket.accept)
63
_SHUTDOWN_POLL_TIMEOUT = 1.0
64
_LOG_WAITING_TIMEOUT = 10.0
68
def __init__(self, backing_transport, root_client_path='/',
53
def __init__(self, backing_transport, root_client_path='/'):
70
54
"""Construct a new server.
72
56
To actually start it running, call either start_background_thread or
75
59
:param backing_transport: The transport to serve.
76
60
:param root_client_path: The client path that will correspond to root
77
61
of backing_transport.
78
:param client_timeout: See SmartServerSocketStreamMedium's timeout
81
63
self.backing_transport = backing_transport
82
64
self.root_client_path = root_client_path
83
self._client_timeout = client_timeout
84
self._active_connections = []
85
# This is set to indicate we want to wait for clients to finish before
87
self._gracefully_stopping = False
89
66
def start_server(self, host, port):
90
67
"""Create the server listening socket.
116
93
self._sockname = self._server_socket.getsockname()
117
94
self.port = self._sockname[1]
118
95
self._server_socket.listen(1)
119
self._server_socket.settimeout(self._ACCEPT_TIMEOUT)
120
# Once we start accept()ing connections, we set started.
96
self._server_socket.settimeout(1)
121
97
self._started = threading.Event()
122
# Once we stop accept()ing connections (and are closing the socket) we
124
98
self._stopped = threading.Event()
125
# Once we have finished waiting for all clients, etc. We set
127
self._fully_stopped = threading.Event()
129
100
def _backing_urls(self):
130
101
# There are three interesting urls:
132
103
# The URL that a commit done on the same machine as the server will
133
104
# have within the servers space. (e.g. file:///home/user/source)
134
105
# The URL that will be given to other hooks in the same process -
135
# the URL of the backing transport itself. (e.g. filtered-36195:///)
106
# the URL of the backing transport itself. (e.g. chroot+:///)
136
107
# We need all three because:
137
108
# * other machines see the first
138
109
# * local commits on this machine should be able to be mapped to
163
134
for hook in SmartTCPServer.hooks['server_stopped']:
164
135
hook(backing_urls, self.get_url())
166
def _stop_gracefully(self):
167
trace.note(gettext('Requested to stop gracefully'))
168
self._should_terminate = True
169
self._gracefully_stopping = True
170
for handler, _ in self._active_connections:
171
handler._stop_gracefully()
173
def _wait_for_clients_to_disconnect(self):
174
self._poll_active_connections()
175
if not self._active_connections:
177
trace.note(gettext('Waiting for %d client(s) to finish')
178
% (len(self._active_connections),))
179
t_next_log = self._timer() + self._LOG_WAITING_TIMEOUT
180
while self._active_connections:
182
if now >= t_next_log:
183
trace.note(gettext('Still waiting for %d client(s) to finish')
184
% (len(self._active_connections),))
185
t_next_log = now + self._LOG_WAITING_TIMEOUT
186
self._poll_active_connections(self._SHUTDOWN_POLL_TIMEOUT)
188
137
def serve(self, thread_name_suffix=''):
189
# Note: There is a temptation to do
190
# signals.register_on_hangup(id(self), self._stop_gracefully)
191
# However, that creates a temporary object which is a bound
192
# method. signals._on_sighup is a WeakKeyDictionary so it
193
# immediately gets garbage collected, because nothing else
194
# references it. Instead, we need to keep a real reference to the
195
# bound method for the lifetime of the serve() function.
196
stop_gracefully = self._stop_gracefully
197
signals.register_on_hangup(id(self), stop_gracefully)
198
138
self._should_terminate = False
199
139
# for hooks we are letting code know that a server has started (and
200
140
# later stopped).
211
151
except self._socket_error, e:
212
152
# if the socket is closed by stop_background_thread
213
# we might get a EBADF here, or if we get a signal we
214
# can get EINTR, any other socket errors should get
216
if e.args[0] not in (errno.EBADF, errno.EINTR):
217
trace.warning(gettext("listening socket error: %s")
153
# we might get a EBADF here, any other socket errors
155
if e.args[0] != errno.EBADF:
156
trace.warning("listening socket error: %s", e)
220
158
if self._should_terminate:
223
160
self.serve_conn(conn, thread_name_suffix)
224
# Cleanout any threads that have finished processing.
225
self._poll_active_connections()
226
161
except KeyboardInterrupt:
227
162
# dont log when CTRL-C'd.
230
165
trace.report_exception(sys.exc_info(), sys.stderr)
234
170
# ensure the server socket is closed.
235
171
self._server_socket.close()
236
172
except self._socket_error:
237
173
# ignore errors on close
240
signals.unregister_on_hangup(id(self))
241
175
self.run_server_stopped_hooks()
242
if self._gracefully_stopping:
243
self._wait_for_clients_to_disconnect()
244
self._fully_stopped.set()
246
177
def get_url(self):
247
178
"""Return the url of the server"""
248
179
return "bzr://%s:%s/" % (self._sockname[0], self._sockname[1])
250
def _make_handler(self, conn):
251
return medium.SmartServerSocketStreamMedium(
252
conn, self.backing_transport, self.root_client_path,
253
timeout=self._client_timeout)
255
def _poll_active_connections(self, timeout=0.0):
256
"""Check to see if any active connections have finished.
258
This will iterate through self._active_connections, and update any
259
connections that are finished.
261
:param timeout: The timeout to pass to thread.join(). By default, we
262
set it to 0, so that we don't hang if threads are not done yet.
266
for handler, thread in self._active_connections:
269
still_active.append((handler, thread))
270
self._active_connections = still_active
272
181
def serve_conn(self, conn, thread_name_suffix):
273
182
# For WIN32, where the timeout value from the listening socket
274
183
# propagates to the newly accepted socket.
275
184
conn.setblocking(True)
276
185
conn.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
186
handler = medium.SmartServerSocketStreamMedium(
187
conn, self.backing_transport, self.root_client_path)
277
188
thread_name = 'smart-server-child' + thread_name_suffix
278
handler = self._make_handler(conn)
279
189
connection_thread = threading.Thread(
280
190
None, handler.serve, name=thread_name)
281
self._active_connections.append((handler, connection_thread))
191
# FIXME: This thread is never joined, it should at least be collected
192
# somewhere so that tests that want to check for leaked threads can get
193
# rid of them -- vila 20100531
282
194
connection_thread.setDaemon(True)
283
195
connection_thread.start()
284
196
return connection_thread
327
239
These are all empty initially, because by default nothing should get
330
Hooks.__init__(self, "bzrlib.smart.server", "SmartTCPServer.hooks")
331
self.add_hook('server_started',
243
self.create_hook(HookPoint('server_started',
332
244
"Called by the bzr server when it starts serving a directory. "
333
245
"server_started is called with (backing urls, public url), "
334
246
"where backing_url is a list of URLs giving the "
335
247
"server-specific directory locations, and public_url is the "
336
"public URL for the directory being served.", (0, 16))
337
self.add_hook('server_started_ex',
248
"public URL for the directory being served.", (0, 16), None))
249
self.create_hook(HookPoint('server_started_ex',
338
250
"Called by the bzr server when it starts serving a directory. "
339
251
"server_started is called with (backing_urls, server_obj).",
341
self.add_hook('server_stopped',
253
self.create_hook(HookPoint('server_stopped',
342
254
"Called by the bzr server when it stops serving a directory. "
343
255
"server_stopped is called with the same parameters as the "
344
"server_started hook: (backing_urls, public_url).", (0, 16))
345
self.add_hook('server_exception',
346
"Called by the bzr server when an exception occurs. "
347
"server_exception is called with the sys.exc_info() tuple "
348
"return true for the hook if the exception has been handled, "
349
"in which case the server will exit normally.", (2, 4))
256
"server_started hook: (backing_urls, public_url).", (0, 16), None))
351
258
SmartTCPServer.hooks = SmartServerHooks()
418
325
chroot_server = chroot.ChrootServer(transport)
419
326
chroot_server.start_server()
420
327
self.cleanups.append(chroot_server.stop_server)
421
transport = _mod_transport.get_transport_from_url(chroot_server.get_url())
328
transport = _mod_transport.get_transport(chroot_server.get_url())
422
329
if self.base_path is not None:
423
330
# Decorate the server's backing transport with a filter that can
424
331
# expand homedirs.
425
332
expand_userdirs = self._make_expand_userdirs_filter(transport)
426
333
expand_userdirs.start_server()
427
334
self.cleanups.append(expand_userdirs.stop_server)
428
transport = _mod_transport.get_transport_from_url(expand_userdirs.get_url())
335
transport = _mod_transport.get_transport(expand_userdirs.get_url())
429
336
self.transport = transport
431
def _get_stdin_stdout(self):
432
return sys.stdin, sys.stdout
434
def _make_smart_server(self, host, port, inet, timeout):
436
c = config.GlobalStack()
437
timeout = c.get('serve.client_timeout')
338
def _make_smart_server(self, host, port, inet):
439
stdin, stdout = self._get_stdin_stdout()
440
340
smart_server = medium.SmartServerPipeStreamMedium(
441
stdin, stdout, self.transport, timeout=timeout)
341
sys.stdin, sys.stdout, self.transport)
444
344
host = medium.BZR_DEFAULT_INTERFACE
446
346
port = medium.BZR_DEFAULT_PORT
447
smart_server = SmartTCPServer(self.transport,
448
client_timeout=timeout)
347
smart_server = SmartTCPServer(self.transport)
449
348
smart_server.start_server(host, port)
450
trace.note(gettext('listening on port: %s') % smart_server.port)
349
trace.note('listening on port: %s' % smart_server.port)
451
350
self.smart_server = smart_server
453
352
def _change_globals(self):
464
363
self.cleanups.append(restore_default_ui_factory_and_lockdir_timeout)
465
364
ui.ui_factory = ui.SilentUIFactory()
466
365
lockdir._DEFAULT_TIMEOUT_SECONDS = 0
467
orig = signals.install_sighup_handler()
468
def restore_signals():
469
signals.restore_sighup_handler(orig)
470
self.cleanups.append(restore_signals)
472
def set_up(self, transport, host, port, inet, timeout):
367
def set_up(self, transport, host, port, inet):
473
368
self._make_backing_transport(transport)
474
self._make_smart_server(host, port, inet, timeout)
369
self._make_smart_server(host, port, inet)
475
370
self._change_globals()
477
372
def tear_down(self):
482
def serve_bzr(transport, host=None, port=None, inet=False, timeout=None):
377
def serve_bzr(transport, host=None, port=None, inet=False):
483
378
"""This is the default implementation of 'bzr serve'.
485
380
It creates a TCP or pipe smart server on 'transport, and runs it. The
486
381
transport will be decorated with a chroot and pathfilter (using
487
382
os.path.expanduser).
489
384
bzr_server = BzrServerFactory()
491
bzr_server.set_up(transport, host, port, inet, timeout)
386
bzr_server.set_up(transport, host, port, inet)
492
387
bzr_server.smart_server.serve()
494
hook_caught_exception = False
495
for hook in SmartTCPServer.hooks['server_exception']:
496
hook_caught_exception = hook(sys.exc_info())
497
if not hook_caught_exception:
500
389
bzr_server.tear_down()