mirror of
https://git.yoctoproject.org/poky
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dee77eca39
In normal usage, we never hit the timeout issue. If we do, it becomes obvious that the current error handling is not good enough. The request may have made it to the server and the answer will get queued. This means the next command may get the return value from the previous command with suitably puzzling results. Without rewriting large sections of code, its not possible to avoid this problem. It is better to increase the timeout to several seconds giving the server a chance to respond and if it does timeout, hard exit since recovery is not possible with the code base today. I'd be happy to see the structure of this code improved but this quick fix at least stops corrupted builds from happening which has to be a good thing. (Bitbake rev: 410c11dd10736873f2dc587fbe9119c38831e693) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
271 lines
8.5 KiB
Python
271 lines
8.5 KiB
Python
#
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# BitBake Process based server.
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#
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# Copyright (C) 2010 Bob Foerster <robert@erafx.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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"""
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This module implements a multiprocessing.Process based server for bitbake.
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"""
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import bb
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import bb.event
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import itertools
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import logging
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import multiprocessing
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import os
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import signal
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import sys
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import time
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from Queue import Empty
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from multiprocessing import Event, Process, util, Queue, Pipe, queues
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logger = logging.getLogger('BitBake')
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class ServerCommunicator():
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def __init__(self, connection):
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self.connection = connection
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def runCommand(self, command):
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# @todo try/except
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self.connection.send(command)
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while True:
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# don't let the user ctrl-c while we're waiting for a response
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try:
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if self.connection.poll(20):
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return self.connection.recv()
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else:
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bb.fatal("Timeout while attempting to communicate with bitbake server")
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except KeyboardInterrupt:
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pass
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class EventAdapter():
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"""
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Adapter to wrap our event queue since the caller (bb.event) expects to
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call a send() method, but our actual queue only has put()
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"""
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def __init__(self, queue):
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self.queue = queue
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def send(self, event):
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try:
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self.queue.put(event)
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except Exception as err:
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print("EventAdapter puked: %s" % str(err))
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class ProcessServer(Process):
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profile_filename = "profile.log"
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profile_processed_filename = "profile.log.processed"
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def __init__(self, command_channel, event_queue):
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Process.__init__(self)
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self.command_channel = command_channel
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self.event_queue = event_queue
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self.event = EventAdapter(event_queue)
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self._idlefunctions = {}
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self.quit = False
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self.keep_running = Event()
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self.keep_running.set()
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def register_idle_function(self, function, data):
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"""Register a function to be called while the server is idle"""
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assert hasattr(function, '__call__')
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self._idlefunctions[function] = data
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def run(self):
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for event in bb.event.ui_queue:
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self.event_queue.put(event)
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self.event_handle = bb.event.register_UIHhandler(self)
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bb.cooker.server_main(self.cooker, self.main)
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def main(self):
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# Ignore SIGINT within the server, as all SIGINT handling is done by
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# the UI and communicated to us
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signal.signal(signal.SIGINT, signal.SIG_IGN)
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while self.keep_running.is_set():
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try:
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if self.command_channel.poll():
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command = self.command_channel.recv()
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self.runCommand(command)
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self.idle_commands(.1)
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except Exception:
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logger.exception('Running command %s', command)
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self.event_queue.cancel_join_thread()
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bb.event.unregister_UIHhandler(self.event_handle)
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self.command_channel.close()
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self.cooker.stop()
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self.idle_commands(.1)
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def idle_commands(self, delay):
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nextsleep = delay
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for function, data in self._idlefunctions.items():
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try:
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retval = function(self, data, False)
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if retval is False:
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del self._idlefunctions[function]
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elif retval is True:
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nextsleep = None
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elif nextsleep is None:
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continue
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elif retval < nextsleep:
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nextsleep = retval
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except SystemExit:
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raise
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except Exception:
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logger.exception('Running idle function')
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if nextsleep is not None:
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time.sleep(nextsleep)
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def runCommand(self, command):
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"""
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Run a cooker command on the server
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"""
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self.command_channel.send(self.cooker.command.runCommand(command))
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def stop(self):
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self.keep_running.clear()
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def bootstrap_2_6_6(self):
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"""Pulled from python 2.6.6. Needed to ensure we have the fix from
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http://bugs.python.org/issue5313 when running on python version 2.6.2
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or lower."""
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try:
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self._children = set()
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self._counter = itertools.count(1)
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try:
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sys.stdin.close()
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sys.stdin = open(os.devnull)
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except (OSError, ValueError):
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pass
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multiprocessing._current_process = self
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util._finalizer_registry.clear()
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util._run_after_forkers()
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util.info('child process calling self.run()')
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try:
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self.run()
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exitcode = 0
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finally:
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util._exit_function()
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except SystemExit as e:
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if not e.args:
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exitcode = 1
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elif type(e.args[0]) is int:
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exitcode = e.args[0]
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else:
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sys.stderr.write(e.args[0] + '\n')
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sys.stderr.flush()
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exitcode = 1
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except:
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exitcode = 1
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import traceback
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sys.stderr.write('Process %s:\n' % self.name)
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sys.stderr.flush()
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traceback.print_exc()
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util.info('process exiting with exitcode %d' % exitcode)
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return exitcode
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# Python versions 2.6.0 through 2.6.2 suffer from a multiprocessing bug
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# which can result in a bitbake server hang during the parsing process
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if (2, 6, 0) <= sys.version_info < (2, 6, 3):
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_bootstrap = bootstrap_2_6_6
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class BitBakeServerConnection():
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def __init__(self, server):
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self.server = server
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self.procserver = server.server
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self.connection = ServerCommunicator(server.ui_channel)
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self.events = server.event_queue
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def terminate(self, force = False):
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signal.signal(signal.SIGINT, signal.SIG_IGN)
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self.procserver.stop()
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if force:
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self.procserver.join(0.5)
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if self.procserver.is_alive():
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self.procserver.terminate()
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self.procserver.join()
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else:
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self.procserver.join()
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while True:
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try:
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event = self.server.event_queue.get(block=False)
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except (Empty, IOError):
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break
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if isinstance(event, logging.LogRecord):
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logger.handle(event)
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self.server.ui_channel.close()
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self.server.event_queue.close()
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if force:
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sys.exit(1)
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# Wrap Queue to provide API which isn't server implementation specific
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class ProcessEventQueue(multiprocessing.queues.Queue):
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def waitEvent(self, timeout):
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try:
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return self.get(True, timeout)
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except Empty:
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return None
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def getEvent(self):
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try:
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return self.get(False)
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except Empty:
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return None
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class BitBakeServer(object):
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def initServer(self):
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# establish communication channels. We use bidirectional pipes for
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# ui <--> server command/response pairs
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# and a queue for server -> ui event notifications
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#
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self.ui_channel, self.server_channel = Pipe()
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self.event_queue = ProcessEventQueue(0)
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self.server = ProcessServer(self.server_channel, self.event_queue)
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def addcooker(self, cooker):
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self.cooker = cooker
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self.server.cooker = cooker
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def getServerIdleCB(self):
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return self.server.register_idle_function
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def saveConnectionDetails(self):
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return
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def detach(self):
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self.server.start()
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return
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def establishConnection(self):
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self.connection = BitBakeServerConnection(self)
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signal.signal(signal.SIGTERM, lambda i, s: self.connection.terminate(force=True))
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return self.connection
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def launchUI(self, uifunc, *args):
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return bb.cooker.server_main(self.cooker, uifunc, *args)
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