Just learned about rpyc last week, very impressive, lots of promise.
if I could just learn to to make it do what I wanted on my Mac
Right now I having trouble with copying files, using Mac OS X Mavericks, in
case that matters.
Experiment #1 --- use classic mode, follow instructions to import rpyc and
make a connection.
The very same unhappiness below happens with different python
implementations (2.7 and 3.4.1)
dmnicol-MacBook-Pro-5:dmnicol$ python3
Python 3.4.1 (v3.4.1:c0e311e010fc, May 18 2014, 00:54:21)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import rpyc
>>> conn = rpyc.classic.connect('localhost')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File
"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/rpyc/utils/classic.py",
line 68, in connect
return factory.connect(host, port, SlaveService, ipv6 = ipv6, keepalive
= keepalive)
File
"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/rpyc/utils/factory.py",
line 89, in connect
s = SocketStream.connect(host, port, ipv6 = ipv6, keepalive = keepalive)
File
"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/rpyc/core/stream.py",
line 132, in connect
return cls(cls._connect(host, port, **kwargs))
File
"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/rpyc/core/stream.py",
line 102, in _connect
s.connect(sockaddr)
ConnectionRefusedError: [Errno 61] Connection refused
-----------
well, huh.
I actually started first with service oriented mode, and looked at classic
mode only when
I couldn't get service oriented stuff to work.
Here's the server code
------- fileServer.py ------
import rpyc
import sys
import argparse
from rpyc.utils.server import ThreadedServer
# this code comes straight off a 'this works for me' example
class FileService(rpyc.Service):
def exposed_open(self,filePath, mode = 'r'):
return open(filePath,mode)
# argparse is overkill for this, but I'm a fan
parser = argparse.ArgumentParser()
parser.add_argument(u'-port', metavar = u'use this port', dest= u'port',
required=True)
args = parser.parse_args( sys.argv[1:] )
if __name__ == "__main__":
# just like numerious examples on the web
t = ThreadedServer(FileService, port=int(args.port))
t.start()
--------------
now the client code
------- fileClient.py -------
from __future__ import print_function
import rpyc
import argparse
import os
import sys
import shutil
# after this args.directory holds directory path and args.port the port
number of the server
parser = argparse.ArgumentParser()
parser.add_argument(u'-port', metavar = u'use this port', dest= u'port',
required=True)
parser.add_argument(u'-dir', metavar = u'local directory name', dest=
u'directory', required=True)
args = parser.parse_args( sys.argv[1:] )
# proof that the problem is not junk coming in from the command line
if not os.path.isdir(args.directory):
print ('directory', args.directory,'not accessible')
exit (1)
# use os.path.join to show problem is not due to badly formated path name
localPath = os.path.join(args.directory,'destination.txt')
remotePath = os.path.join(args.directory,'source.txt')
# test each line separately to isolate the failure
try:
localFile = open(localPath, 'w')
except:
print('cannot open',localPath)
exit
try:
conn = rpyc.connect('localhost', port = int(args.port))
except:
print('rpyc.connect failed')
exit
try:
remoteFile = conn.root.open( remotePath, 'r' )
except:
print('conn.root.open failed')
exit
try:
shutil.copyfileobj(remoteFile, localFile)
except:
print ('copyfileobj error:', sys.exc_info()[0])
---------------
so let's take it out for a spin
-----------
dmnicol-MacBook-Pro-5:np-live dmnicol$
dmnicol-MacBook-Pro-5:np-live dmnicol$ ls testing/
source.txt
dmnicol-MacBook-Pro-5:np-live dmnicol$ python3 fileServer.py -port 11111 &
[1] 24764
dmnicol-MacBook-Pro-5:np-live dmnicol$ python3 fileClient.py -port 11111
-dir 'testing'
copyfileobj error: <class 'AttributeError'>
-----------
and what attribute error might that be? Bring in pdb, step to the
offending line and see
-> shutil.copyfileobj(remoteFile, localFile)
(Pdb) shutil.copyfileobj(remoteFile, localFile)
*** AttributeError: cannot access 'read'
========= Remote Traceback (1) =========
Traceback (most recent call last):
File
"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/rpyc/core/protocol.py",
line 305, in _dispatch_request
res = self._HANDLERS[handler](self, *args)
File
"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/rpyc/core/protocol.py",
line 541, in _handle_getattr
return self._access_attr(oid, name, (), "_rpyc_getattr",
"allow_getattr", getattr)
File
"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/rpyc/core/protocol.py",
line 504, in _access_attr
raise AttributeError("cannot access %r" % (name,))
AttributeError: cannot access 'read'
------------------------
I'm not so sophomoric to believe I'm not doing something wrong here, but
the code is taken nearly
exactly as I'm finding examples to follow. Any help will be appreciated.
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