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import os
import sys
import select
import time
import logging
from threading import Condition
try:
import thread
except ImportError:
# py 3
import _thread as thread
try:
from Queue import Queue
except ImportError:
# py 3
from queue import Queue
try:
import cPickle as pickle
except ImportError:
# py 3
import pickle
from syncdutils import Thread
pickle_proto = -1
repce_version = 1.0
def ioparse(i, o):
if isinstance(i, int):
i = os.fdopen(i)
# rely on duck typing for recognizing
# streams as that works uniformly
# in py2 and py3
if hasattr(o, 'fileno'):
o = o.fileno()
return (i, o)
def send(out, *args):
os.write(out, pickle.dumps(args, pickle_proto))
def recv(inf):
return pickle.load(inf)
class RepceServer(object):
def __init__(self, obj, i, o, wnum=6):
self.obj = obj
self.inf, self.out = ioparse(i, o)
self.wnum = wnum
self.q = Queue()
def service_loop(self):
for i in range(self.wnum):
t = Thread(target=self.worker)
t.start()
try:
while True:
self.q.put(recv(self.inf))
except EOFError:
logging.info("terminating on reaching EOF.")
def worker(self):
while True:
in_data = self.q.get(True)
rid = in_data[0]
rmeth = in_data[1]
exc = False
if rmeth == '__repce_version__':
res = repce_version
else:
try:
res = getattr(self.obj, rmeth)(*in_data[2:])
except:
res = sys.exc_info()[1]
exc = True
logging.exception("call failed: ")
send(self.out, rid, exc, res)
class RepceJob(object):
def __init__(self, cbk):
self.rid = (os.getpid(), thread.get_ident(), time.time())
self.cbk = cbk
self.lever = Condition()
self.done = False
def __repr__(self):
return ':'.join([str(x) for x in self.rid])
def wait(self):
self.lever.acquire()
if not self.done:
self.lever.wait()
self.lever.release()
return self.result
def wakeup(self, data):
self.result = data
self.lever.acquire()
self.done = True
self.lever.notify()
self.lever.release()
class RepceClient(object):
def __init__(self, i, o):
self.inf, self.out = ioparse(i, o)
self.jtab = {}
t = Thread(target = self.listen)
t.start()
def listen(self):
while True:
select.select((self.inf,), (), ())
rid, exc, res = recv(self.inf)
rjob = self.jtab.pop(rid)
if rjob.cbk:
rjob.cbk(rjob, [exc, res])
def push(self, meth, *args, **kw):
cbk = kw.get('cbk')
if not cbk:
def cbk(rj, res):
if res[0]:
raise res[1]
rjob = RepceJob(cbk)
self.jtab[rjob.rid] = rjob
logging.debug("call %s %s%s ..." % (repr(rjob), meth, repr(args)))
send(self.out, rjob.rid, meth, *args)
return rjob
def __call__(self, meth, *args):
rjob = self.push(meth, *args, **{'cbk': lambda rj, res: rj.wakeup(res)})
exc, res = rjob.wait()
if exc:
logging.error('call %s (%s) failed on peer with %s' % (repr(rjob), meth, str(type(res).__name__)))
raise res
logging.debug("call %s %s -> %s" % (repr(rjob), meth, repr(res)))
return res
class mprx(object):
def __init__(self, ins, meth):
self.ins = ins
self.meth = meth
def __call__(self, *a):
return self.ins(self.meth, *a)
def __getattr__(self, meth):
return self.mprx(self, meth)
def __version__(self):
d = {'proto': self('__repce_version__')}
try:
d['object'] = self('version')
except AttributeError:
pass
return d
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