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# Copyright (c) Facebook, Inc. and its affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
"""
Simplistic RPC implementation.
Exposes all functions of a Server object.
This code is for demonstration purposes only, and does not include certain
security protections. It is not meant to be run on an untrusted network or
in a production environment.
"""
import importlib
import os
import pickle
import sys
import _thread
import traceback
import socket
import logging
LOG = logging.getLogger(__name__)
# default
PORT = 12032
safe_modules = {
'numpy',
'numpy.core.multiarray',
}
class RestrictedUnpickler(pickle.Unpickler):
def find_class(self, module, name):
# Only allow safe modules.
if module in safe_modules:
return getattr(importlib.import_module(module), name)
# Forbid everything else.
raise pickle.UnpicklingError("global '%s.%s' is forbidden" %
(module, name))
class FileSock:
" wraps a socket so that it is usable by pickle/cPickle "
def __init__(self,sock):
self.sock = sock
self.nr=0
def write(self, buf):
# print("sending %d bytes"%len(buf))
#self.sock.sendall(buf)
# print("...done")
bs = 512 * 1024
ns = 0
while ns < len(buf):
sent = self.sock.send(buf[ns:ns + bs])
ns += sent
def read(self,bs=512*1024):
#if self.nr==10000: pdb.set_trace()
self.nr+=1
# print("read bs=%d"%bs)
b = []
nb = 0
while len(b)<bs:
# print(' loop')
rb = self.sock.recv(bs - nb)
if not rb: break
b.append(rb)
nb += len(rb)
return b''.join(b)
def readline(self):
# print("readline!")
"""may be optimized..."""
s=bytes()
while True:
c=self.read(1)
s+=c
if len(c)==0 or chr(c[0])=='\n':
return s
class ClientExit(Exception):
pass
class ServerException(Exception):
pass
class Server:
"""
server protocol. Methods from classes that subclass Server can be called
transparently from a client
"""
def __init__(self, s, logf=sys.stderr, log_prefix=''):
self.logf = logf
self.log_prefix = log_prefix
# connection
self.conn = s
self.fs = FileSock(s)
def log(self, s):
self.logf.write("Sever log %s: %s\n" % (self.log_prefix, s))
def one_function(self):
"""
Executes a single function with associated I/O.
Protocol:
- the arguments and results are serialized with the pickle protocol
- client sends : (fname,args)
fname = method name to call
args = tuple of arguments
- server sends result: (rid,st,ret)
rid = request id
st = None, or exception if there was during execution
ret = return value or None if st!=None
"""
try:
(fname, args) = RestrictedUnpickler(self.fs).load()
except EOFError:
raise ClientExit("read args")
self.log("executing method %s"%(fname))
st = None
ret = None
try:
f=getattr(self,fname)
except AttributeError:
st = AttributeError("unknown method "+fname)
self.log("unknown method")
try:
ret = f(*args)
except Exception as e:
# due to a bug (in mod_python?), ServerException cannot be
# unpickled, so send the string and make the exception on the client side
#st=ServerException(
# "".join(traceback.format_tb(sys.exc_info()[2]))+
# str(e))
st="".join(traceback.format_tb(sys.exc_info()[2]))+str(e)
self.log("exception in method")
traceback.print_exc(50,self.logf)
self.logf.flush()
LOG.info("return")
try:
pickle.dump((st ,ret), self.fs, protocol=4)
except EOFError:
raise ClientExit("function return")
def exec_loop(self):
""" main execution loop. Loops and handles exit states"""
self.log("in exec_loop")
try:
while True:
self.one_function()
except ClientExit as e:
self.log("ClientExit %s"%e)
except socket.error as e:
self.log("socket error %s"%e)
traceback.print_exc(50,self.logf)
except EOFError:
self.log("EOF during communication")
traceback.print_exc(50,self.logf)
except BaseException:
# unexpected
traceback.print_exc(50,sys.stderr)
sys.exit(1)
LOG.info("exit sever")
def exec_loop_cleanup(self):
pass
###################################################################
# spying stuff
def get_ps_stats(self):
ret=''
f=os.popen("echo ============ `hostname` uptime:; uptime;"+
"echo ============ self:; "+
"ps -p %d -o pid,vsize,rss,%%cpu,nlwp,psr; "%os.getpid()+
"echo ============ run queue:;"+
"ps ar -o user,pid,%cpu,%mem,ni,nlwp,psr,vsz,rss,cputime,command")
for l in f:
ret+=l
return ret
class Client:
"""
Methods of the server object can be called transparently. Exceptions are
re-raised.
"""
def __init__(self, HOST, port=PORT, v6=False):
socktype = socket.AF_INET6 if v6 else socket.AF_INET
sock = socket.socket(socktype, socket.SOCK_STREAM)
LOG.info("connecting to %s:%d, socket type: %s", HOST, port, socktype)
sock.connect((HOST, port))
self.sock = sock
self.fs = FileSock(sock)
def generic_fun(self, fname, args):
# int "gen fun",fname
pickle.dump((fname, args), self.fs, protocol=4)
return self.get_result()
def get_result(self):
(st, ret) = RestrictedUnpickler(self.fs).load()
if st!=None:
raise ServerException(st)
else:
return ret
def __getattr__(self,name):
return lambda *x: self.generic_fun(name,x)
def run_server(new_handler, port=PORT, report_to_file=None, v6=False):
HOST = '' # Symbolic name meaning the local host
socktype = socket.AF_INET6 if v6 else socket.AF_INET
s = socket.socket(socktype, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
LOG.info("bind %s:%d", HOST, port)
s.bind((HOST, port))
s.listen(5)
LOG.info("accepting connections")
if report_to_file is not None:
LOG.info('storing host+port in %s', report_to_file)
open(report_to_file, 'w').write('%s:%d ' % (socket.gethostname(), port))
while True:
try:
conn, addr = s.accept()
except socket.error as e:
if e[1]=='Interrupted system call': continue
raise
LOG.info('Connected to %s', addr)
ibs = new_handler(conn)
tid = _thread.start_new_thread(ibs.exec_loop,())
LOG.debug("Thread ID: %d", tid)
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