def read (self):
"""
reads blockingly from the socket and parses the data into a list
returns: args
if args==None, nothing read, socket's dead or closed or something.
else, args is a list with whatever came down the line.
if that list is empty, then the other side closed.
"""
args= None
try:
# self.log ('[%d]<-- loading...' % self._socket.fileno ())
size= self.readData (8)
if len (size)==8:
size= int(size)
line= self.readData (size)
# self.log ('[%d]<-- read' % self.fileno ())
args= csvParse (line)
else:
# EOF
args= []
# self.log ("[%d]<-- %s" % (self._socket.fileno (), args))
self.debug (1, "[%d]<-- %s" % (self.fileno (), args))
except Exception, e:
# self.debug (5, 'exception %s' % e)
# self.debug (5, '[%d] dead!' % (self._socket.fileno ()))
raise UmbDead
def dirContents(self, ino, contents=None):
if not contents == None:
self.data["%d" % ino] = csvPrettyPrint(contents)
ans = contents
else:
ans = csvParse(self.data["%d" % ino])
return ans
def dirContents (self, ino, contents=None):
if not contents==None:
self.data["%d" % ino]= csvPrettyPrint (contents)
ans= contents
else:
ans= csvParse (self.data["%d" % ino])
return ans
def discover (self, net, skip=None):
"""
broadcasts messages for discovering the peers
returns: the peer to which we should connect to.
"""
shouter= socket (AF_INET, SOCK_DGRAM)
# set socket option
shouter.setsockopt (SOL_SOCKET, SO_BROADCAST, 1)
server= None
# we need to be root and a default gw here!
# shouter.sendto ('any body there?', ('<broadcast>', consts.chalPort))
# no if we broadcast the net only...
self.debug (1, 'Ping %s' % net)
shouter.sendto ('any body there?', (net, consts.chalPort))
# wait for answers
sleep (consts.shoutTimeOut)
# now wait for at least one
# but let things go on in the case the shout was not heard
# nope, navels that doesn't find others should start their own ring
# but vices should wait till they find one,
# so navels and vices do different things
i= select ([shouter],[],[], 0.1)[0]
# collect *any* answer
while len(i)>0:
ans= csvParse (shouter.recv (1024))
self.debug (1, 'found %s' % ans)
(url, key)= ans[0]
new= self._peers.getNavel (url, key)
if skip:
if new!=skip:
server= new
else:
server= new
i= select ([shouter],[],[], 0.1)[0]
self.debug (1, 'returning %s' % server)
return server
def readPoll (self):
"""
Tries to read a line from the file.
If it timeouts, returns None.
If it fails (EOF) return [].
Otherwise, returns the data read once eval()'ed.
"""
# self.debug (1, '[%d]<-- reading...' % self.fileno (), 2)
args= None
try:
i= select ([self.fileno ()], [], [], 5)[0]
# self.debug (1, '[%d]<-- selected...' % self.fileno (), 3)
if len (i)>0:
# self.debug (5, '[%d]<-- loading...' % self.fileno (), 4)
# self.log ('[%d]<-- reading...' % self.fileno ())
size= self.readData (8)
# self.debug (2, 'about to read >%s< bytes' % size)
size= int(size)
line= self.readData (size)
# line= self._file.readline ()
# line= chomp (line)
# self.log ('[%d]<-- read' % self.fileno ())
if line:
args= csvParse (line)
else:
# EOF
args= []
# using pickles (blej!)
# args= load (self._file)
# args= load (self._socket)
# self.log ("[%d]<-- %s" % (self.fileno (), args))
self.debug (1, "[%d]<-- %s" % (self.fileno (), args))
else:
# self.debug (2, 'timeout!')
pass
except Exception, e:
raise UmbDead
