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#
# 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(20):
return self.connection.recv()
else:
bb.fatal("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 uifunc(*args)
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