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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 logging
import signal
import sys
import time
import bb
import bb.event
from multiprocessing import Process, Event
from bb.cooker import BBCooker
logger = logging.getLogger('BitBake')
NULL = open('/dev/null', 'r+')
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
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, err:
print("EventAdapter puked: %s" % str(err))
class ProcessServer(Process):
def __init__(self, command_channel, event_queue, configuration):
Process.__init__(self)
self.command_channel = command_channel
self.event_queue = event_queue
self.event = EventAdapter(event_queue)
self.configuration = configuration
self.cooker = BBCooker(configuration, self.register_idle_function)
self._idlefunctions = {}
self.event_handle = bb.event.register_UIHhandler(self)
self.quit = False
self.keep_running = Event()
self.keep_running.set()
for event in bb.event.ui_queue:
self.event_queue.put(event)
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):
"""Run the server, killing off stdin/stdout/stderr"""
with bb.utils.redirected_fds([sys.stdin, sys.stdout, sys.stderr],
[NULL, NULL, NULL]):
return 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()
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