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#
# Copyright (C) 2006 - 2007 Michael 'Mickey' Lauer
# Copyright (C) 2006 - 2007 Richard Purdie
#
# SPDX-License-Identifier: GPL-2.0-only
#
"""
Use this class to fork off a thread to recieve event callbacks from the bitbake
server and queue them for the UI to process. This process must be used to avoid
client/server deadlocks.
"""
import collections, logging, pickle, socket, threading
from xmlrpc.server import SimpleXMLRPCServer, SimpleXMLRPCRequestHandler
import bb
logger = logging.getLogger(__name__)
class BBUIEventQueue:
def __init__(self, BBServer, clientinfo=("localhost, 0")):
self.eventQueue = []
self.eventQueueLock = threading.Lock()
self.eventQueueNotify = threading.Event()
self.BBServer = BBServer
self.clientinfo = clientinfo
server = UIXMLRPCServer(self.clientinfo)
self.host, self.port = server.socket.getsockname()
server.register_function( self.system_quit, "event.quit" )
server.register_function( self.send_event, "event.sendpickle" )
server.socket.settimeout(1)
self.EventHandle = None
# the event handler registration may fail here due to cooker being in invalid state
# this is a transient situation, and we should retry a couple of times before
# giving up
for count_tries in range(5):
ret = self.BBServer.registerEventHandler(self.host, self.port)
if isinstance(ret, collections.abc.Iterable):
self.EventHandle, error = ret
else:
self.EventHandle = ret
error = ""
if self.EventHandle is not None:
break
errmsg = "Could not register UI event handler. Error: %s, host %s, "\
"port %d" % (error, self.host, self.port)
bb.warn("%s, retry" % errmsg)
import time
time.sleep(1)
else:
raise Exception(errmsg)
self.server = server
self.t = threading.Thread()
self.t.daemon = True
self.t.run = self.startCallbackHandler
self.t.start()
def getEvent(self):
with bb.utils.lock_timeout(self.eventQueueLock):
if not self.eventQueue:
return None
item = self.eventQueue.pop(0)
if not self.eventQueue:
self.eventQueueNotify.clear()
return item
def waitEvent(self, delay):
self.eventQueueNotify.wait(delay)
return self.getEvent()
def queue_event(self, event):
with bb.utils.lock_timeout(self.eventQueueLock):
self.eventQueue.append(event)
self.eventQueueNotify.set()
def send_event(self, event):
self.queue_event(pickle.loads(event))
def startCallbackHandler(self):
self.server.timeout = 1
bb.utils.set_process_name("UIEventQueue")
while not self.server.quit:
try:
self.server.handle_request()
except Exception as e:
import traceback
logger.error("BBUIEventQueue.startCallbackHandler: Exception while trying to handle request: %s\n%s" % (e, traceback.format_exc()))
self.server.server_close()
def system_quit( self ):
"""
Shut down the callback thread
"""
try:
self.BBServer.unregisterEventHandler(self.EventHandle)
except:
pass
self.server.quit = True
class UIXMLRPCServer (SimpleXMLRPCServer):
def __init__( self, interface ):
self.quit = False
SimpleXMLRPCServer.__init__( self,
interface,
requestHandler=SimpleXMLRPCRequestHandler,
logRequests=False, allow_none=True, use_builtin_types=True)
def get_request(self):
while not self.quit:
try:
sock, addr = self.socket.accept()
sock.settimeout(1)
return (sock, addr)
except socket.timeout:
pass
return (None, None)
def close_request(self, request):
if request is None:
return
SimpleXMLRPCServer.close_request(self, request)
def process_request(self, request, client_address):
if request is None:
return
SimpleXMLRPCServer.process_request(self, request, client_address)
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