1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
|
#
# BitBake Process based server.
#
# Copyright (C) 2010 Bob Foerster <robert@erafx.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""
This module implements a multiprocessing.Process based server for bitbake.
"""
import bb
import bb.event
import itertools
import logging
import multiprocessing
import os
import signal
import sys
import time
from Queue import Empty
from multiprocessing import Event, Process, util, Queue, Pipe, queues
logger = logging.getLogger('BitBake')
class ServerCommunicator():
def __init__(self, connection):
self.connection = connection
def runCommand(self, command):
# @todo try/except
self.connection.send(command)
while True:
# don't let the user ctrl-c while we're waiting for a response
try:
if self.connection.poll(.5):
return self.connection.recv()
else:
return None, "Timeout while attempting to communicate with bitbake server"
except KeyboardInterrupt:
pass
class EventAdapter():
"""
Adapter to wrap our event queue since the caller (bb.event) expects to
call a send() method, but our actual queue only has put()
"""
def __init__(self, queue):
self.queue = queue
def send(self, event):
try:
self.queue.put(event)
except Exception as err:
print("EventAdapter puked: %s" % str(err))
class ProcessServer(Process):
profile_filename = "profile.log"
profile_processed_filename = "profile.log.processed"
def __init__(self, command_channel, event_queue):
Process.__init__(self)
self.command_channel = command_channel
self.event_queue = event_queue
self.event = EventAdapter(event_queue)
self._idlefunctions = {}
self.quit = False
self.keep_running = Event()
self.keep_running.set()
def register_idle_function(self, function, data):
"""Register a function to be called while the server is idle"""
assert hasattr(function, '__call__')
self._idlefunctions[function] = data
def run(self):
for event in bb.event.ui_queue:
self.event_queue.put(event)
self.event_handle = bb.event.register_UIHhandler(self)
bb.cooker.server_main(self.cooker, self.main)
def main(self):
# Ignore SIGINT within the server, as all SIGINT handling is done by
# the UI and communicated to us
signal.signal(signal.SIGINT, signal.SIG_IGN)
while self.keep_running.is_set():
try:
if self.command_channel.poll():
command = self.command_channel.recv()
self.runCommand(command)
self.idle_commands(.1)
except Exception:
logger.exception('Running command %s', command)
self.event_queue.cancel_join_thread()
bb.event.unregister_UIHhandler(self.event_handle)
self.command_channel.close()
self.cooker.stop()
self.idle_commands(.1)
def idle_commands(self, delay):
nextsleep = delay
for function, data in self._idlefunctions.items():
try:
retval = function(self, data, False)
if retval is False:
del self._idlefunctions[function]
elif retval is True:
nextsleep = None
elif nextsleep is None:
continue
elif retval < nextsleep:
nextsleep = retval
except SystemExit:
raise
except Exception:
logger.exception('Running idle function')
if nextsleep is not None:
time.sleep(nextsleep)
def runCommand(self, command):
"""
Run a cooker command on the server
"""
self.command_channel.send(self.cooker.command.runCommand(command))
def stop(self):
self.keep_running.clear()
def bootstrap_2_6_6(self):
"""Pulled from python 2.6.6. Needed to ensure we have the fix from
http://bugs.python.org/issue5313 when running on python version 2.6.2
or lower."""
try:
self._children = set()
self._counter = itertools.count(1)
try:
sys.stdin.close()
sys.stdin = open(os.devnull)
except (OSError, ValueError):
pass
multiprocessing._current_process = self
util._finalizer_registry.clear()
util._run_after_forkers()
util.info('child process calling self.run()')
try:
self.run()
exitcode = 0
finally:
util._exit_function()
except SystemExit as e:
if not e.args:
exitcode = 1
elif type(e.args[0]) is int:
exitcode = e.args[0]
else:
sys.stderr.write(e.args[0] + '\n')
sys.stderr.flush()
exitcode = 1
except:
exitcode = 1
import traceback
sys.stderr.write('Process %s:\n' % self.name)
sys.stderr.flush()
traceback.print_exc()
util.info('process exiting with exitcode %d' % exitcode)
return exitcode
# Python versions 2.6.0 through 2.6.2 suffer from a multiprocessing bug
# which can result in a bitbake server hang during the parsing process
if (2, 6, 0) <= sys.version_info < (2, 6, 3):
_bootstrap = bootstrap_2_6_6
class BitBakeServerConnection():
def __init__(self, server):
self.server = server
self.procserver = server.server
self.connection = ServerCommunicator(server.ui_channel)
self.events = server.event_queue
def terminate(self, force = False):
signal.signal(signal.SIGINT, signal.SIG_IGN)
self.procserver.stop()
if force:
self.procserver.join(0.5)
if self.procserver.is_alive():
self.procserver.terminate()
self.procserver.join()
else:
self.procserver.join()
while True:
try:
event = self.server.event_queue.get(block=False)
except (Empty, IOError):
break
if isinstance(event, logging.LogRecord):
logger.handle(event)
self.server.ui_channel.close()
self.server.event_queue.close()
if force:
sys.exit(1)
# Wrap Queue to provide API which isn't server implementation specific
class ProcessEventQueue(multiprocessing.queues.Queue):
def waitEvent(self, timeout):
try:
return self.get(True, timeout)
except Empty:
return None
def getEvent(self):
try:
return self.get(False)
except Empty:
return None
class BitBakeServer(object):
def initServer(self):
# establish communication channels. We use bidirectional pipes for
# ui <--> server command/response pairs
# and a queue for server -> ui event notifications
#
self.ui_channel, self.server_channel = Pipe()
self.event_queue = ProcessEventQueue(0)
self.server = ProcessServer(self.server_channel, self.event_queue)
def addcooker(self, cooker):
self.cooker = cooker
self.server.cooker = cooker
def getServerIdleCB(self):
return self.server.register_idle_function
def saveConnectionDetails(self):
return
def detach(self):
self.server.start()
return
def establishConnection(self):
self.connection = BitBakeServerConnection(self)
signal.signal(signal.SIGTERM, lambda i, s: self.connection.terminate(force=True))
return self.connection
def launchUI(self, uifunc, *args):
return bb.cooker.server_main(self.cooker, uifunc, *args)
|
