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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 ConfigParser import SafeConfigParser, NoSectionError
import logging, socket, urlparse, time, Bcfg2.tlslite.errors
from Bcfg2.tlslite.integration.XMLRPCTransport import XMLRPCTransport
import xmlrpclib
from xmlrpclib import _Method
__all__ = ["ComponentProxy", "RetryMethod"]
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:
self.log.error("Server failure: Protocol Error")
raise xmlrpclib.Fault(20, "Server Failure")
except socket.error, (err, msg):
if retry == 3:
self.log.error("Server failure: %s" % msg)
raise xmlrpclib.Fault(20, msg)
except Bcfg2.tlslite.errors.TLSFingerprintError, err:
self.log.error("Server fingerprint did not match")
errmsg = err.message.split()
self.log.error("Got %s expected %s" % (errmsg[3], errmsg[4]))
raise SystemExit, 1
except Bcfg2.tlslite.errors.TLSError, err:
self.log.error("Unexpected TLS Error: %s. Retrying" % \
(err.message))
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
def ComponentProxy (url, user=None, password=None, fingerprint=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
return xmlrpclib.ServerProxy(newurl, allow_none=True,
transport=XMLRPCTransport(x509Fingerprint=fingerprint))
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