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#
# BitBake 'dummy' Passthrough Server
#
# Copyright (C) 2006 - 2007 Michael 'Mickey' Lauer
# Copyright (C) 2006 - 2008 Richard Purdie
#
# 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 passthrough server for BitBake.
Use register_idle_function() to add a function which the server
calls from within idle_commands when no requests are pending. Make sure
that those functions are non-blocking or else you will introduce latency
in the server's main loop.
"""
import time
import bb
import signal
DEBUG = False
import inspect, select
class BitBakeServerCommands():
def __init__(self, server):
self.server = server
def runCommand(self, command):
"""
Run a cooker command on the server
"""
#print "Running Command %s" % command
return self.cooker.command.runCommand(command)
def terminateServer(self):
"""
Trigger the server to quit
"""
self.server.server_exit()
#print "Server (cooker) exitting"
return
def ping(self):
"""
Dummy method which can be used to check the server is still alive
"""
return True
eventQueue = []
class BBUIEventQueue:
class event:
def __init__(self, parent):
self.parent = parent
@staticmethod
def send(event):
bb.server.none.eventQueue.append(event)
@staticmethod
def quit():
return
def __init__(self, BBServer):
self.eventQueue = bb.server.none.eventQueue
self.BBServer = BBServer
self.EventHandle = bb.event.register_UIHhandler(self)
def __popEvent(self):
if len(self.eventQueue) == 0:
return None
return self.eventQueue.pop(0)
def getEvent(self):
if len(self.eventQueue) == 0:
self.BBServer.idle_commands(0)
return self.__popEvent()
def waitEvent(self, delay):
event = self.__popEvent()
if event:
return event
self.BBServer.idle_commands(delay)
return self.__popEvent()
def queue_event(self, event):
self.eventQueue.append(event)
def system_quit( self ):
bb.event.unregister_UIHhandler(self.EventHandle)
# Dummy signal handler to ensure we break out of sleep upon SIGCHLD
def chldhandler(signum, stackframe):
pass
class BitBakeNoneServer():
# remove this when you're done with debugging
# allow_reuse_address = True
def __init__(self):
self._idlefuns = {}
self.commands = BitBakeServerCommands(self)
def addcooker(self, cooker):
self.cooker = cooker
self.commands.cooker = cooker
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 idle_commands(self, delay):
#print "Idle queue length %s" % len(self._idlefuns)
#print "Idle timeout, running idle functions"
#if len(self._idlefuns) == 0:
nextsleep = delay
for function, data in self._idlefuns.items():
try:
retval = function(self, data, False)
#print "Idle function returned %s" % (retval)
if retval is False:
del self._idlefuns[function]
elif retval is True:
nextsleep = None
elif nextsleep is None:
continue
elif retval < nextsleep:
nextsleep = retval
except SystemExit:
raise
except:
import traceback
traceback.print_exc()
self.commands.runCommand(["stateShutdown"])
pass
if nextsleep is not None:
#print "Sleeping for %s (%s)" % (nextsleep, delay)
signal.signal(signal.SIGCHLD, chldhandler)
time.sleep(nextsleep)
signal.signal(signal.SIGCHLD, signal.SIG_DFL)
def server_exit(self):
# Tell idle functions we're exiting
for function, data in self._idlefuns.items():
try:
retval = function(self, data, True)
except:
pass
class BitBakeServerConnection():
def __init__(self, server):
self.server = server.server
self.connection = self.server.commands
self.events = bb.server.none.BBUIEventQueue(self.server)
for event in bb.event.ui_queue:
self.events.queue_event(event)
def terminate(self):
try:
self.events.system_quit()
except:
pass
try:
self.connection.terminateServer()
except:
pass
class BitBakeServer(object):
def initServer(self):
self.server = BitBakeNoneServer()
def addcooker(self, cooker):
self.cooker = cooker
self.server.addcooker(cooker)
def getServerIdleCB(self):
return self.server.register_idle_function
def saveConnectionDetails(self):
return
def detach(self, cooker_logfile):
self.logfile = cooker_logfile
def establishConnection(self):
self.connection = BitBakeServerConnection(self)
return self.connection
def launchUI(self, uifunc, *args):
return bb.cooker.server_main(self.cooker, uifunc, *args)
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