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Fix various bugs in the worker process control code and switch to using local sockets to communicate on Unix

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This commit is contained in:
Kovid Goyal 2008-07-19 02:10:49 -07:00
parent d2c5ba9de4
commit 1a45fc3d58
3 changed files with 164 additions and 92 deletions
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5
src/calibre/gui2/main.py
View file

@ -1241,9 +1241,10 @@ def main(args=sys.argv):
if single_instance is not None and single_instance.is_running() and \
single_instance.send_message('launched:'+repr(args)):
return 0
extra = '' if iswindows else \
('If you\'re sure it is not running, delete the file %s.'%os.path.expanduser('~/.calibre_calibre GUI.lock'))
QMessageBox.critical(None, 'Cannot Start '+__appname__,
'<p>%s is already running.</p>'%__appname__)
'<p>%s is already running. %s</p>'%(__appname__, extra))
return 1
initialize_file_icon_provider()
try:

197
src/calibre/parallel.py
View file

@ -6,7 +6,7 @@
'''
Used to run jobs in parallel in separate processes. Features output streaming,
support for progress notification as well as job killing. The worker processes
are controlled via a simple protocol run over TCP/IP sockets. The control happens
are controlled via a simple protocol run over sockets. The control happens
mainly in two class, :class:`Server` and :class:`Overseer`. The worker is
encapsulated in the function :function:`worker`. Every worker process
has the environment variable :envvar:`CALIBRE_WORKER` defined.
@ -25,7 +25,7 @@
is buffered and asynchronous to prevent the job from being IO bound.
'''
import sys, os, gc, cPickle, traceback, atexit, cStringIO, time, signal, \
subprocess, socket, collections, binascii, re, tempfile, thread
subprocess, socket, collections, binascii, re, tempfile, thread, tempfile
from select import select
from functools import partial
from threading import RLock, Thread, Event
@ -33,6 +33,7 @@
from calibre.ptempfile import PersistentTemporaryFile
from calibre import iswindows, detect_ncpus, isosx
DEBUG = False
#: A mapping from job names to functions that perform the jobs
PARALLEL_FUNCS = {
@ -51,11 +52,14 @@
isfrozen = hasattr(sys, 'frozen')
isworker = False
win32event = __import__('win32event') if iswindows else None
win32process = __import__('win32process') if iswindows else None
msvcrt = __import__('msvcrt') if iswindows else None
SOCKET_TYPE = socket.AF_UNIX if not iswindows else socket.AF_INET
class WorkerStatus(object):
'''
A platform independent class to control child processes. Provides the
@ -223,6 +227,7 @@ def spawn_free_spirit_windows(self, arg, type='free_spirit'):
mother = WorkerMother()
_comm_lock = RLock()
def write(socket, msg, timeout=5):
'''
Write a message on socket. If `msg` is unicode, it is encoded in utf-8.
@ -230,22 +235,29 @@ def write(socket, msg, timeout=5):
`msg` is broken into chunks of size 4096 and sent. The :function:`read` function
automatically re-assembles the chunks into whole message.
'''
if isinstance(msg, unicode):
msg = msg.encode('utf-8')
length = None
while len(msg) > 0:
if length is None:
length = len(msg)
chunk = ('%-12d'%length) + msg[:4096-12]
msg = msg[4096-12:]
else:
chunk, msg = msg[:4096], msg[4096:]
w = select([], [socket], [], timeout)[1]
if not w:
raise RuntimeError('Write to socket timed out')
if socket.sendall(chunk) is not None:
raise RuntimeError('Failed to write chunk to socket')
if isworker:
_comm_lock.acquire()
try:
if isinstance(msg, unicode):
msg = msg.encode('utf-8')
if DEBUG:
print >>sys.__stdout__, 'write(%s):'%('worker' if isworker else 'overseer'), repr(msg)
length = None
while len(msg) > 0:
if length is None:
length = len(msg)
chunk = ('%-12d'%length) + msg[:4096-12]
msg = msg[4096-12:]
else:
chunk, msg = msg[:4096], msg[4096:]
w = select([], [socket], [], timeout)[1]
if not w:
raise RuntimeError('Write to socket timed out')
if socket.sendall(chunk) is not None:
raise RuntimeError('Failed to write chunk to socket')
finally:
if isworker:
_comm_lock.release()
def read(socket, timeout=5):
'''
@ -253,24 +265,33 @@ def read(socket, timeout=5):
function. Raises a `RuntimeError` if the message is corrpted. Can return an
empty string.
'''
buf = cStringIO.StringIO()
length = None
while select([socket],[],[],timeout)[0]:
msg = socket.recv(4096)
if not msg:
break
if length is None:
length, msg = int(msg[:12]), msg[12:]
buf.write(msg)
if buf.tell() >= length:
break
if not length:
return ''
msg = buf.getvalue()[:length]
if len(msg) < length:
raise RuntimeError('Corrupted packet received')
return msg
if isworker:
_comm_lock.acquire()
try:
buf = cStringIO.StringIO()
length = None
while select([socket],[],[],timeout)[0]:
msg = socket.recv(4096)
if not msg:
break
if length is None:
length, msg = int(msg[:12]), msg[12:]
buf.write(msg)
if buf.tell() >= length:
break
if not length:
if DEBUG:
print >>sys.__stdout__, 'read(%s):'%('worker' if isworker else 'overseer'), 'nothing'
return ''
msg = buf.getvalue()[:length]
if len(msg) < length:
raise RuntimeError('Corrupted packet received')
if DEBUG:
print >>sys.__stdout__, 'read(%s):'%('worker' if isworker else 'overseer'), repr(msg)
return msg
finally:
if isworker:
_comm_lock.release()
class RepeatingTimer(Thread):
'''
@ -306,11 +327,13 @@ class Overseer(object):
INTERVAL = 0.1
def __init__(self, server, port, timeout=5):
self.worker_status = mother.spawn_worker('127.0.0.1:%d'%port)
self.worker_status = mother.spawn_worker('127.0.0.1:'+str(port))
self.socket = server.accept()[0]
# Needed if terminate called hwen interpreter is shutting down
self.os = os
self.signal = signal
self.on_probation = False
self.terminated = False
self.working = False
self.timeout = timeout
@ -329,6 +352,7 @@ def __init__(self, server, port, timeout=5):
def terminate(self):
'Kill worker process.'
self.terminated = True
try:
if self.socket:
self.write('STOP:')
@ -363,7 +387,9 @@ def read(self, timeout=None):
def __eq__(self, other):
return hasattr(other, 'process') and hasattr(other, 'worker_pid') and self.worker_pid == other.worker_pid
def __bool__(self):
def is_viable(self):
if self.terminated:
return False
return self.worker_status.is_alive()
def select(self, timeout=0):
@ -386,6 +412,7 @@ def initialize_job(self, job):
self.output = job.output if callable(job.output) else sys.stdout.write
self.progress = job.progress if callable(job.progress) else None
self.job = job
self.last_report = time.time()
def control(self):
'''
@ -397,8 +424,21 @@ def control(self):
'''
if select([self.socket],[],[],0)[0]:
msg = self.read()
if msg:
self.on_probation = False
self.last_report = time.time()
else:
if self.on_probation:
self.terminate()
return Result(None, ControlError('Worker process died unexpectedly'), '')
else:
self.on_probation = True
return
word, msg = msg.partition(':')[0], msg.partition(':')[-1]
if word == 'RESULT':
if word == 'PING':
self.write('OK')
return
elif word == 'RESULT':
self.write('OK')
return Result(cPickle.loads(msg), None, None)
elif word == 'OUTPUT':
@ -421,11 +461,11 @@ def control(self):
return Result(None, *cPickle.loads(msg))
else:
self.terminate()
return Result(None, ControlError('Worker sent invalid msg: %s', repr(msg)), '')
if not self.worker_status.is_alive():
return Result(None, ControlError('Worker process died unexpectedly with returncode: %d'%self.process.returncode), '')
return Result(None, ControlError('Worker sent invalid msg: %s'%repr(msg)), '')
if not self.worker_status.is_alive() or time.time() - self.last_report > 180:
self.terminate()
return Result(None, ControlError('Worker process died unexpectedly with returncode: %s'%str(self.process.returncode)), '')
class Job(object):
@ -458,18 +498,23 @@ class Server(Thread):
KILL_RESULT = Overseer.KILL_RESULT
START_PORT = 10013
PID = os.getpid()
def __init__(self, number_of_workers=detect_ncpus()):
Thread.__init__(self)
self.setDaemon(True)
self.server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.port = self.START_PORT
self.server_socket = socket.socket(SOCKET_TYPE, socket.SOCK_STREAM)
self.port = tempfile.mktemp(prefix='calibre_server')+'_%d_'%self.PID if not iswindows else self.START_PORT
while True:
try:
self.server_socket.bind(('localhost', self.port))
address = ('localhost', self.port) if iswindows else self.port
self.server_socket.bind(address)
break
except:
self.port += 1
except socket.error:
self.port += (1 if iswindows else '1')
if not iswindows:
atexit.register(os.unlink, self.port)
self.server_socket.listen(5)
self.number_of_workers = number_of_workers
self.pool, self.jobs, self.working, self.results = [], collections.deque(), [], {}
@ -525,7 +570,7 @@ def run(self):
res = Result(None, unicode(err), traceback.format_exc())
job.done(res)
o = None
if o:
if o and o.is_viable():
with self.working_lock:
self.working.append(o)
@ -542,7 +587,7 @@ def run(self):
done.append(o)
for o in done:
self.working.remove(o)
if o:
if o and o.is_viable():
with self.pool_lock:
self.pool.append(o)
@ -601,9 +646,11 @@ def __init__(self, socket):
self.socket = socket
self.wbuf, self.pbuf = [], []
self.wlock, self.plock = RLock(), RLock()
self.last_report = None
self.timer = RepeatingTimer(0.5, self.send, 'BufferedSender')
self.timer.start()
def write(self, msg):
if not isinstance(msg, basestring):
msg = unicode(msg)
@ -623,20 +670,31 @@ def send(self):
if not select([], [self.socket], [], 30)[1]:
print >>sys.__stderr__, 'Cannot pipe to overseer'
return
reported = False
with self.wlock:
if self.wbuf:
msg = cPickle.dumps(self.wbuf, -1)
self.wbuf = []
write(self.socket, 'OUTPUT:'+msg)
read(self.socket, 10)
reported = True
with self.plock:
if self.pbuf:
msg = cPickle.dumps(self.pbuf, -1)
self.pbuf = []
write(self.socket, 'PROGRESS:'+msg)
read(self.socket, 10)
read(self.socket, 10)
reported = True
if self.last_report is not None:
if reported:
self.last_report = time.time()
elif time.time() - self.last_report > 60:
write(self.socket, 'PING:')
read(self.socket, 10)
self.last_report = time.time()
def notify(self, percent, msg=''):
with self.plock:
@ -652,19 +710,25 @@ def get_func(name):
return func, kwdargs, notification
def work(client_socket, func, args, kwdargs):
func, kargs, notification = get_func(func)
if notification is not None and hasattr(sys.stdout, 'notify'):
kargs[notification] = sys.stdout.notify
kargs.update(kwdargs)
res = func(*args, **kargs)
if hasattr(sys.stdout, 'send'):
sys.stdout.send()
return res
sys.stdout.last_report = time.time()
try:
func, kargs, notification = get_func(func)
if notification is not None and hasattr(sys.stdout, 'notify'):
kargs[notification] = sys.stdout.notify
kargs.update(kwdargs)
res = func(*args, **kargs)
if hasattr(sys.stdout, 'send'):
sys.stdout.send()
return res
finally:
sys.stdout.last_report = None
time.sleep(5) # Give any in progress BufferedSend time to complete
def worker(host, port):
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect((host, port))
client_socket = socket.socket(SOCKET_TYPE, socket.SOCK_STREAM)
address = (host, port) if iswindows else port
client_socket.connect(address)
write(client_socket, 'CALIBRE_WORKER:%d'%os.getpid())
msg = read(client_socket, timeout=10)
if msg != 'OK':
@ -685,10 +749,11 @@ def worker(host, port):
try:
result = work(client_socket, func, args, kwdargs)
write(client_socket, 'RESULT:'+ cPickle.dumps(result))
except (Exception, SystemExit), err:
except BaseException, err:
exception = (err.__class__.__name__, unicode(str(err), 'utf-8', 'replace'))
tb = traceback.format_exc()
write(client_socket, 'ERROR:'+cPickle.dumps((exception, tb),-1))
msg = 'ERROR:'+cPickle.dumps((exception, tb),-1)
write(client_socket, msg)
if read(client_socket, 10) != 'OK':
break
gc.collect()
@ -714,11 +779,13 @@ def free_spirit(path):
func(*args, **kargs)
def main(args=sys.argv):
global isworker
isworker = True
args = args[1].split(':')
if len(args) == 1:
free_spirit(binascii.unhexlify(re.sub(r'[^a-f0-9A-F]', '', args[0])))
else:
worker(args[0].replace("'", ''), int(args[1]))
worker(args[0].replace("'", ''), int(args[1]) if iswindows else args[1])
return 0
if __name__ == '__main__':

54
src/calibre/utils/fontconfig.py
View file

@ -130,36 +130,40 @@ class FcValue(Structure):
_init_error = None
_initialized = False
from threading import Timer
def _do_init():
# Initialize the fontconfig library. This has to be done manually
# for the OS X bundle as it may have its own private fontconfig.
if hasattr(sys, 'frameworks_dir'):
config_dir = os.path.join(os.path.dirname(getattr(sys, 'frameworks_dir')), 'Resources', 'fonts')
if isinstance(config_dir, unicode):
config_dir = config_dir.encode(sys.getfilesystemencoding())
config = lib.FcConfigCreate()
if not lib.FcConfigParseAndLoad(config, os.path.join(config_dir, 'fonts.conf'), 1):
_init_error = 'Could not parse the fontconfig configuration'
from threading import Thread
class FontScanner(Thread):
def run(self):
# Initialize the fontconfig library. This has to be done manually
# for the OS X bundle as it may have its own private fontconfig.
if getattr(sys, 'frameworks_dir', False):
config_dir = os.path.join(os.path.dirname(getattr(sys, 'frameworks_dir')), 'Resources', 'fonts')
if isinstance(config_dir, unicode):
config_dir = config_dir.encode(sys.getfilesystemencoding())
config = lib.FcConfigCreate()
if not lib.FcConfigParseAndLoad(config, os.path.join(config_dir, 'fonts.conf'), 1):
_init_error = 'Could not parse the fontconfig configuration'
return
if not lib.FcConfigBuildFonts(config):
_init_error = 'Could not build fonts'
return
if not lib.FcConfigSetCurrent(config):
_init_error = 'Could not set font config'
return
elif not lib.FcInit():
_init_error = _('Could not initialize the fontconfig library')
return
if not lib.FcConfigBuildFonts(config):
_init_error = 'Could not build fonts'
return
if not lib.FcConfigSetCurrent(config):
_init_error = 'Could not set font config'
return
elif not lib.FcInit():
_init_error = _('Could not initialize the fontconfig library')
return
global _initialized
_initialized = True
global _initialized
_initialized = True
_init_timer = Timer(0.1, _do_init)
_init_timer.start()
_scanner = FontScanner()
_scanner.start()
def join():
_init_timer.join()
_scanner.join(120)
if _scanner.isAlive():
raise RuntimeError('Scanning for system fonts seems to have hung. Try again in a little while.')
if _init_error is not None:
raise RuntimeError(_init_error)