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"""RPC client access to cobalt components.
Classes:
ComponentProxy -- an RPC client proxy to Cobalt components
Functions:
load_config -- read configuration files
"""
__revision__ = '$Revision: $'
from xmlrpclib import _Method
import httplib
import logging
import socket
import ssl
import string
import sys
import time
import urlparse
import xmlrpclib
version = string.split(string.split(sys.version)[0], ".")
has_py26 = map(int, version) >= [2, 6]
__all__ = ["ComponentProxy", "RetryMethod", "SSLHTTPConnection", "XMLRPCTransport"]
class CertificateError(Exception):
def __init__(self, commonName):
self.commonName = commonName
class RetryMethod(_Method):
"""Method with error handling and retries built in"""
log = logging.getLogger('xmlrpc')
def __call__(self, *args):
max_retries = 4
for retry in range(max_retries):
try:
return _Method.__call__(self, *args)
except xmlrpclib.ProtocolError, err:
self.log.error("Server failure: Protocol Error: %s %s" % \
(err.errcode, err.errmsg))
raise xmlrpclib.Fault(20, "Server Failure")
except xmlrpclib.Fault:
raise
except socket.error, err:
if retry == 3:
self.log.error("Server failure: %s" % err)
raise xmlrpclib.Fault(20, err)
except CertificateError, ce:
self.log.error("Got unallowed commonName %s from server" \
% ce.commonName)
break
except:
self.log.error("Unknown failure", exc_info=1)
break
time.sleep(0.5)
raise xmlrpclib.Fault(20, "Server Failure")
# sorry jon
xmlrpclib._Method = RetryMethod
class SSLHTTPConnection(httplib.HTTPConnection):
def __init__(self, host, port=None, strict=None, timeout=90, key=None,
cert=None, ca=None, scns=None, protocol='xmlrpc/ssl'):
if not has_py26:
httplib.HTTPConnection.__init__(self, host, port, strict)
else:
httplib.HTTPConnection.__init__(self, host, port, strict, timeout)
self.key = key
self.cert = cert
self.ca = ca
self.scns = scns
if self.ca:
self.ca_mode = ssl.CERT_REQUIRED
else:
self.ca_mode = ssl.CERT_NONE
if protocol == 'xmlrpc/ssl':
self.ssl_protocol = ssl.PROTOCOL_SSLv23
elif protocol == 'xmlrpc/tlsv1':
self.ssl_protocol = ssl.PROTOCOL_TLSv1
else:
self.logger.error("Unknown protocol %s" % (protocol))
raise Exception, "unknown protocol %s" % protocol
def connect(self):
rawsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
if has_py26:
rawsock.settimeout(self.timeout)
self.sock = ssl.SSLSocket(rawsock, cert_reqs=self.ca_mode,
ca_certs=self.ca, suppress_ragged_eofs=True,
keyfile=self.key, certfile=self.cert,
ssl_version=self.ssl_protocol)
self.sock.connect((self.host, self.port))
pc = self.sock.getpeercert()
if pc and self.scns:
scn = [x[0][1] for x in pc['subject'] if x[0][0] == 'commonName'][0]
if scn not in self.scns:
raise CertificateError, scn
self.sock.closeSocket = True
class XMLRPCTransport(xmlrpclib.Transport):
def __init__(self, key=None, cert=None, ca=None, scns=None, use_datetime=0):
if hasattr(xmlrpclib.Transport, '__init__'):
xmlrpclib.Transport.__init__(self, use_datetime)
self.key = key
self.cert = cert
self.ca = ca
self.scns = scns
def make_connection(self, host):
host = self.get_host_info(host)[0]
http = SSLHTTPConnection(host, key=self.key, cert=self.cert, ca=self.ca,
scns=self.scns)
https = httplib.HTTP()
https._setup(http)
return https
def request(self, host, handler, request_body, verbose=0):
'''send request to server and return response'''
h = self.make_connection(host)
self.send_request(h, handler, request_body)
self.send_host(h, host)
self.send_user_agent(h)
self.send_content(h, request_body)
errcode, errmsg, headers = h.getreply()
msglen = int(headers.dict['content-length'])
if errcode != 200:
raise xmlrpclib.ProtocolError(host + handler, errcode, errmsg, headers)
self.verbose = verbose
return self._get_response(h.getfile(), msglen)
def _get_response(self, fd, length):
# read response from input file/socket, and parse it
recvd = 0
p, u = self.getparser()
while recvd < length:
rlen = min(length - recvd, 1024)
response = fd.read(rlen)
recvd += len(response)
if not response:
break
if self.verbose:
print "body:", repr(response), len(response)
p.feed(response)
fd.close()
p.close()
return u.close()
def ComponentProxy (url, user=None, password=None, key=None, cert=None, ca=None,
allowedServerCNs=None):
"""Constructs proxies to components.
Arguments:
component_name -- name of the component to connect to
Additional arguments are passed to the ServerProxy constructor.
"""
if user and password:
method, path = urlparse.urlparse(url)[:2]
newurl = "%s://%s:%s@%s" % (method, user, password, path)
else:
newurl = url
ssl_trans = XMLRPCTransport(key, cert, ca, allowedServerCNs)
return xmlrpclib.ServerProxy(newurl, allow_none=True, transport=ssl_trans)
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