summaryrefslogtreecommitdiffstats
path: root/bitbake/lib/bb/server/process.py
blob: 3530bdc07e5192c067e50a595ee95d83bfa6afb0 (plain)
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
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
#
# 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 logging
import multiprocessing
import threading
import array
import os
import sys
import time
import select
import socket
import subprocess
import errno
import bb.server.xmlrpcserver
from bb import daemonize
from multiprocessing import queues

logger = logging.getLogger('BitBake')

class ProcessTimeout(SystemExit):
    pass

class ProcessServer(multiprocessing.Process):
    profile_filename = "profile.log"
    profile_processed_filename = "profile.log.processed"

    def __init__(self, lock, sock, sockname):
        multiprocessing.Process.__init__(self)
        self.command_channel = False
        self.command_channel_reply = False
        self.quit = False
        self.heartbeat_seconds = 1 # default, BB_HEARTBEAT_EVENT will be checked once we have a datastore.
        self.next_heartbeat = time.time()

        self.event_handle = None
        self.haveui = False
        self.lastui = False
        self.xmlrpc = False

        self._idlefuns = {}

        self.bitbake_lock = lock
        self.sock = sock
        self.sockname = sockname

    def register_idle_function(self, function, data):
        """Register a function to be called while the server is idle"""
        assert hasattr(function, '__call__')
        self._idlefuns[function] = data

    def run(self):

        if self.xmlrpcinterface[0]:
            self.xmlrpc = bb.server.xmlrpcserver.BitBakeXMLRPCServer(self.xmlrpcinterface, self.cooker, self)

            print("Bitbake XMLRPC server address: %s, server port: %s" % (self.xmlrpc.host, self.xmlrpc.port))

        heartbeat_event = self.cooker.data.getVar('BB_HEARTBEAT_EVENT')
        if heartbeat_event:
            try:
                self.heartbeat_seconds = float(heartbeat_event)
            except:
                bb.warn('Ignoring invalid BB_HEARTBEAT_EVENT=%s, must be a float specifying seconds.' % heartbeat_event)

        self.timeout = self.server_timeout or self.cooker.data.getVar('BB_SERVER_TIMEOUT')
        try:
            if self.timeout:
                self.timeout = float(self.timeout)
        except:
            bb.warn('Ignoring invalid BB_SERVER_TIMEOUT=%s, must be a float specifying seconds.' % self.timeout)


        try:
            self.bitbake_lock.seek(0)
            self.bitbake_lock.truncate()
            if self.xmlrpc:
                self.bitbake_lock.write("%s %s:%s\n" % (os.getpid(), self.xmlrpc.host, self.xmlrpc.port))
            else:
                self.bitbake_lock.write("%s\n" % (os.getpid()))
            self.bitbake_lock.flush()
        except:
            pass

        if self.cooker.configuration.profile:
            try:
                import cProfile as profile
            except:
                import profile
            prof = profile.Profile()

            ret = profile.Profile.runcall(prof, self.main)

            prof.dump_stats("profile.log")
            bb.utils.process_profilelog("profile.log")
            print("Raw profiling information saved to profile.log and processed statistics to profile.log.processed")

        else:
            ret = self.main()

        return ret

    def main(self):
        self.cooker.pre_serve()

        bb.utils.set_process_name("Cooker")

        ready = []

        self.controllersock = False
        fds = [self.sock]
        if self.xmlrpc:
            fds.append(self.xmlrpc)
        while not self.quit:
            if self.command_channel in ready:
                command = self.command_channel.get()
                if command[0] == "terminateServer":
                    self.quit = True
                    continue
                try:
                    print("Running command %s" % command)
                    self.command_channel_reply.send(self.cooker.command.runCommand(command))
                except Exception as e:
                   logger.exception('Exception in server main event loop running command %s (%s)' % (command, str(e)))

            if self.xmlrpc in ready:
                self.xmlrpc.handle_requests()
            if self.sock in ready:
                self.controllersock, address = self.sock.accept()
                if self.haveui:
                    print("Dropping connection attempt as we have a UI %s" % (str(ready)))
                    self.controllersock.close()
                else:
                    print("Accepting %s" % (str(ready)))
                    fds.append(self.controllersock)
            if self.controllersock in ready:
                try:
                    print("Connecting Client")
                    ui_fds = recvfds(self.controllersock, 3)

                    # Where to write events to
                    writer = ConnectionWriter(ui_fds[0])
                    self.event_handle = bb.event.register_UIHhandler(writer, True)
                    self.event_writer = writer

                    # Where to read commands from
                    reader = ConnectionReader(ui_fds[1])
                    fds.append(reader)
                    self.command_channel = reader

                    # Where to send command return values to
                    writer = ConnectionWriter(ui_fds[2])
                    self.command_channel_reply = writer

                    self.haveui = True

                except EOFError:
                    print("Disconnecting Client")
                    fds.remove(self.controllersock)
                    fds.remove(self.command_channel)
                    bb.event.unregister_UIHhandler(self.event_handle, True)
                    self.command_channel_reply.writer.close()
                    self.event_writer.writer.close()
                    del self.event_writer
                    self.controllersock.close()
                    self.haveui = False
                    self.lastui = time.time()
                    self.cooker.clientComplete()
                    if self.timeout is None:
                        print("No timeout, exiting.")
                        self.quit = True
            if not self.haveui and self.lastui and self.timeout and (self.lastui + self.timeout) < time.time():
                print("Server timeout, exiting.")
                self.quit = True

            ready = self.idle_commands(.1, fds)

        print("Exiting")
        try: 
            self.cooker.shutdown(True)
        except:
            pass

        self.cooker.post_serve()

        # Remove the socket file so we don't get any more connections to avoid races
        os.unlink(self.sockname)
        self.sock.close()

        # Finally release the lockfile but warn about other processes holding it open
        lock = self.bitbake_lock
        lockfile = lock.name
        lock.close()
        lock = None

        while not lock:
            with bb.utils.timeout(3):
                lock = bb.utils.lockfile(lockfile, shared=False, retry=False, block=True)
                if not lock:
                    # Some systems may not have lsof available
                    procs = None
                    try:
                        procs = subprocess.check_output(["lsof", '-w', lockfile], stderr=subprocess.STDOUT)
                    except OSError as e:
                        if e.errno != errno.ENOENT:
                            raise
                    if procs is None:
                        # Fall back to fuser if lsof is unavailable
                        try:
                            procs = subprocess.check_output(["fuser", '-v', lockfile], stderr=subprocess.STDOUT)
                        except OSError as e:
                            if e.errno != errno.ENOENT:
                                raise

                    msg = "Delaying shutdown due to active processes which appear to be holding bitbake.lock"
                    if procs:
                        msg += ":\n%s" % str(procs)
                    print(msg)
                    return
        # We hold the lock so we can remove the file (hide stale pid data)
        bb.utils.remove(lockfile)
        bb.utils.unlockfile(lock)

    def idle_commands(self, delay, fds=None):
        nextsleep = delay
        if not fds:
            fds = []

        for function, data in list(self._idlefuns.items()):
            try:
                retval = function(self, data, False)
                if retval is False:
                    del self._idlefuns[function]
                    nextsleep = None
                elif retval is True:
                    nextsleep = None
                elif isinstance(retval, float) and nextsleep:
                    if (retval < nextsleep):
                        nextsleep = retval
                elif nextsleep is None:
                    continue
                else:
                    fds = fds + retval
            except SystemExit:
                raise
            except Exception as exc:
                if not isinstance(exc, bb.BBHandledException):
                    logger.exception('Running idle function')
                del self._idlefuns[function]
                self.quit = True

        # Create new heartbeat event?
        now = time.time()
        if now >= self.next_heartbeat:
            # We might have missed heartbeats. Just trigger once in
            # that case and continue after the usual delay.
            self.next_heartbeat += self.heartbeat_seconds
            if self.next_heartbeat <= now:
                self.next_heartbeat = now + self.heartbeat_seconds
            heartbeat = bb.event.HeartbeatEvent(now)
            bb.event.fire(heartbeat, self.cooker.data)
        if nextsleep and now + nextsleep > self.next_heartbeat:
            # Shorten timeout so that we we wake up in time for
            # the heartbeat.
            nextsleep = self.next_heartbeat - now

        if nextsleep is not None:
            if self.xmlrpc:
                nextsleep = self.xmlrpc.get_timeout(nextsleep)
            try:
                return select.select(fds,[],[],nextsleep)[0]
            except InterruptedError:
                # Ignore EINTR
                return []
        else:
            return []


class ServerCommunicator():
    def __init__(self, connection, recv):
        self.connection = connection
        self.recv = recv

    def runCommand(self, command):

        self.connection.send(command)
        while True:
            # don't let the user ctrl-c while we're waiting for a response
            try:
                for idx in range(0,4): # 0, 1, 2, 3
                    if self.recv.poll(1):
                        return self.recv.get()
                    else:
                        bb.note("Timeout while attempting to communicate with bitbake server, retrying...")
                raise ProcessTimeout("Gave up; Too many tries: timeout while attempting to communicate with bitbake server")
            except KeyboardInterrupt:
                pass

    def updateFeatureSet(self, featureset):
        _, error = self.runCommand(["setFeatures", featureset])
        if error:
            logger.error("Unable to set the cooker to the correct featureset: %s" % error)
            raise BaseException(error)

    def getEventHandle(self):
        handle, error = self.runCommand(["getUIHandlerNum"])
        if error:
            logger.error("Unable to get UI Handler Number: %s" % error)
            raise BaseException(error)

        return handle

    def terminateServer(self):
        self.connection.send(['terminateServer'])
        return

class BitBakeProcessServerConnection(object):
    def __init__(self, ui_channel, recv, eq, sock):
        self.connection = ServerCommunicator(ui_channel, recv)
        self.events = eq
        # Save sock so it doesn't get gc'd for the life of our connection
        self.socket_connection = sock

    def terminate(self):
        self.socket_connection.close()
        self.connection.connection.close()
        self.connection.recv.close()
        return

class BitBakeServer(object):
    def __init__(self, lock, sockname, configuration, featureset):

        self.configuration = configuration
        self.featureset = featureset
        self.sockname = sockname
        self.bitbake_lock = lock
        self.readypipe, self.readypipein = os.pipe()

        # Create server control socket
        if os.path.exists(sockname):
            os.unlink(sockname)

        self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
        # AF_UNIX has path length issues so chdir here to workaround
        cwd = os.getcwd()
        logfile = os.path.join(cwd, "bitbake-cookerdaemon.log")

        try:
            os.chdir(os.path.dirname(sockname))
            self.sock.bind(os.path.basename(sockname))
        finally:
            os.chdir(cwd)
        self.sock.listen(1)

        os.set_inheritable(self.sock.fileno(), True)
        bb.daemonize.createDaemon(self._startServer, logfile)
        self.sock.close()
        self.bitbake_lock.close()

        ready = ConnectionReader(self.readypipe)
        r = ready.wait(8)
        if not r:
            ready.close()
            bb.error("Unable to start bitbake server")
            if os.path.exists(logfile):
                with open(logfile, "r") as f:
                    logs=f.readlines()
                bb.error("Last 10 lines of server log %s:\n%s" % (logfile, "".join(logs[-10:])))
            raise SystemExit(1)
        ready.close()
        os.close(self.readypipein)

    def _startServer(self):
        server = ProcessServer(self.bitbake_lock, self.sock, self.sockname)
        self.configuration.setServerRegIdleCallback(server.register_idle_function)

        # Copy prefile and postfile to _server variants
        for param in ('prefile', 'postfile'):
            value = getattr(self.configuration, param)
            if value:
                setattr(self.configuration, "%s_server" % param, value)

        self.cooker = bb.cooker.BBCooker(self.configuration, self.featureset, self.readypipein)
        server.cooker = self.cooker
        server.server_timeout = self.configuration.server_timeout
        server.xmlrpcinterface = self.configuration.xmlrpcinterface
        print("Started bitbake server pid %d" % os.getpid())
        server.start()

def connectProcessServer(sockname, featureset):
    # Connect to socket
    sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
    # AF_UNIX has path length issues so chdir here to workaround
    cwd = os.getcwd()

    try:
        os.chdir(os.path.dirname(sockname))
        sock.connect(os.path.basename(sockname))
    finally:
        os.chdir(cwd)

    readfd = writefd = readfd1 = writefd1 = readfd2 = writefd2 = None
    eq = command_chan_recv = command_chan = None

    try:

        # Send an fd for the remote to write events to
        readfd, writefd = os.pipe()
        eq = BBUIEventQueue(readfd)
        # Send an fd for the remote to recieve commands from
        readfd1, writefd1 = os.pipe()
        command_chan = ConnectionWriter(writefd1)
        # Send an fd for the remote to write commands results to
        readfd2, writefd2 = os.pipe()
        command_chan_recv = ConnectionReader(readfd2)

        sendfds(sock, [writefd, readfd1, writefd2])

        server_connection = BitBakeProcessServerConnection(command_chan, command_chan_recv, eq, sock)

        # Close the ends of the pipes we won't use
        for i in [writefd, readfd1, writefd2]:
            os.close(i)

        server_connection.connection.updateFeatureSet(featureset)

    except (Exception, SystemExit) as e:
        if command_chan_recv:
            command_chan_recv.close()
        if command_chan:
            command_chan.close()
        for i in [writefd, readfd1, writefd2]:
            try:
                os.close(i)
            except OSError:
                pass
        sock.close()
        raise

    return server_connection

def sendfds(sock, fds):
        '''Send an array of fds over an AF_UNIX socket.'''
        fds = array.array('i', fds)
        msg = bytes([len(fds) % 256])
        sock.sendmsg([msg], [(socket.SOL_SOCKET, socket.SCM_RIGHTS, fds)])

def recvfds(sock, size):
        '''Receive an array of fds over an AF_UNIX socket.'''
        a = array.array('i')
        bytes_size = a.itemsize * size
        msg, ancdata, flags, addr = sock.recvmsg(1, socket.CMSG_LEN(bytes_size))
        if not msg and not ancdata:
            raise EOFError
        try:
            if len(ancdata) != 1:
                raise RuntimeError('received %d items of ancdata' %
                                   len(ancdata))
            cmsg_level, cmsg_type, cmsg_data = ancdata[0]
            if (cmsg_level == socket.SOL_SOCKET and
                cmsg_type == socket.SCM_RIGHTS):
                if len(cmsg_data) % a.itemsize != 0:
                    raise ValueError
                a.frombytes(cmsg_data)
                assert len(a) % 256 == msg[0]
                return list(a)
        except (ValueError, IndexError):
            pass
        raise RuntimeError('Invalid data received')

class BBUIEventQueue:
    def __init__(self, readfd):

        self.eventQueue = []
        self.eventQueueLock = threading.Lock()
        self.eventQueueNotify = threading.Event()

        self.reader = ConnectionReader(readfd)

        self.t = threading.Thread()
        self.t.setDaemon(True)
        self.t.run = self.startCallbackHandler
        self.t.start()

    def getEvent(self):
        self.eventQueueLock.acquire()

        if len(self.eventQueue) == 0:
            self.eventQueueLock.release()
            return None

        item = self.eventQueue.pop(0)

        if len(self.eventQueue) == 0:
            self.eventQueueNotify.clear()

        self.eventQueueLock.release()
        return item

    def waitEvent(self, delay):
        self.eventQueueNotify.wait(delay)
        return self.getEvent()

    def queue_event(self, event):
        self.eventQueueLock.acquire()
        self.eventQueue.append(event)
        self.eventQueueNotify.set()
        self.eventQueueLock.release()

    def send_event(self, event):
        self.queue_event(pickle.loads(event))

    def startCallbackHandler(self):
        bb.utils.set_process_name("UIEventQueue")
        while True:
            try:
                self.reader.wait()
                event = self.reader.get()
                self.queue_event(event)
            except EOFError:
                # Easiest way to exit is to close the file descriptor to cause an exit
                break
        self.reader.close()

class ConnectionReader(object):

    def __init__(self, fd):
        self.reader = multiprocessing.connection.Connection(fd, writable=False)
        self.rlock = multiprocessing.Lock()

    def wait(self, timeout=None):
        return multiprocessing.connection.wait([self.reader], timeout)

    def poll(self, timeout=None):
        return self.reader.poll(timeout)

    def get(self):
        with self.rlock:
            res = self.reader.recv_bytes()
        return multiprocessing.reduction.ForkingPickler.loads(res)

    def fileno(self):
        return self.reader.fileno()

    def close(self):
        return self.reader.close()


class ConnectionWriter(object):

    def __init__(self, fd):
        self.writer = multiprocessing.connection.Connection(fd, readable=False)
        self.wlock = multiprocessing.Lock()
        # Why bb.event needs this I have no idea
        self.event = self

    def send(self, obj):
        obj = multiprocessing.reduction.ForkingPickler.dumps(obj)
        with self.wlock:
            self.writer.send_bytes(obj)

    def fileno(self):
        return self.writer.fileno()

    def close(self):
        return self.writer.close()