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Editing: rpcServer.py

import os
import sys
import socket
import time

from up2date_client import config
from up2date_client import clientCaps
from up2date_client import up2dateLog
from up2date_client import up2dateErrors
from up2date_client import up2dateUtils

from rhn import SSL
from rhn import rpclib
from rhn.tb import raise_with_tb

try: # python2
     import httplib
     import urllib2
     import urlparse
     import xmlrpclib
except ImportError: # python3
     import http.client as httplib
     import urllib.request as urllib2
     import urllib.parse as urlparse
     import xmlrpc.client as xmlrpclib

import gettext
t = gettext.translation('rhn-client-tools', fallback=True)
# Python 3 translations don't have a ugettext method
if not hasattr(t, 'ugettext'):
    t.ugettext = t.gettext
_ = t.ugettext

def stdoutMsgCallback(msg):
    print(msg)

class RetryServer(rpclib.Server):
    def addServerList(self, serverList):
        self.serverList = serverList

def _request1(self, methodname, params):
        self.log = up2dateLog.initLog()
        while 1:
            try:
                ret = self._request(methodname, params)
            except rpclib.InvalidRedirectionError:
                raise
            except xmlrpclib.Fault:
                raise
            except httplib.BadStatusLine:
                self.log.log_me("Error: Server Unavailable. Please try later.")
                stdoutMsgCallback(
                      _("Error: Server Unavailable. Please try later."))
                sys.exit(-1)
            except:
                server = self.serverList.next()
                if server == None:
                    # since just because we failed, the server list could
                    # change (aka, firstboot, they get an option to reset the
                    # the server configuration) so reset the serverList
                    self.serverList.resetServerIndex()
                    raise

msg = "An error occurred talking to %s:\n" % self._host
                msg = msg + "%s\n%s\n" % (sys.exc_info()[0], sys.exc_info()[1])
                msg = msg + "Trying the next serverURL: %s\n" % self.serverList.server()
                self.log.log_me(msg)
                # try a different url

# use the next serverURL
                parse_res = urlparse.urlsplit(self.serverList.server())
                typ = parse_res[0] # scheme
                self._host = parse_res[1] # netloc
                self._handler = parse_res[2] # path
                typ = typ.lower()
                if typ not in ("http", "https"):
                    raise_with_tb(rpclib.InvalidRedirectionError(
                        "Redirected to unsupported protocol %s" % typ))
                self._orig_handler = self._handler
                self._type = typ
                self._uri = self.serverList.server()
                if not self._handler:
                    self._handler = "/RPC2"
                self._allow_redirect = 1
                continue
            # if we get this far, we succedded
            break
        return ret

def __getattr__(self, name):
        # magic method dispatcher
        return rpclib.xmlrpclib._Method(self._request1, name)

# uh, yeah, this could be an iterator, but we need it to work on 1.5 as well
class ServerList:
    def __init__(self, serverlist=[]):
        self.serverList = serverlist
        self.index = 0

def server(self):
        self.serverurl = self.serverList[self.index]
        return self.serverurl

def next(self):
        self.index = self.index + 1
        if self.index >= len(self.serverList):
            return None
        return self.server()

def resetServerIndex(self):
        self.index = 0

def getCLNServer(refreshCallback=None, serverOverride=None, timeout=None):
    cfg = config.initUp2dateConfig()
    if serverOverride is None:
        serverOverride = cfg["clnServerURL"]
        if serverOverride is None or len(serverOverride.strip()) == 0:
            serverOverride = "http://cln.cloudlinux.com/clweb/xmlrpc"
        serverOverride = [ serverOverride ]
    return getServer(refreshCallback, serverOverride, timeout)

def getServer(refreshCallback=None, serverOverride=None, timeout=None):
    log = up2dateLog.initLog()
    cfg = config.initUp2dateConfig()

# Where do we keep the CA certificate for RHNS?
    # The servers we're talking to need to have their certs
    # signed by one of these CA.
    ca = cfg["sslCACert"]
    if not isinstance(ca, list):
        ca = [ca]

rhns_ca_certs = ca or ["/usr/share/rhn/CLN-ORG-TRUSTED-SSL-CERT"]
    if cfg["enableProxy"]:
        proxyHost = config.getProxySetting()
    else:
        proxyHost = None

if not serverOverride:
        serverUrls = config.getServerlURL()
    else:
        serverUrls = serverOverride
    serverList = ServerList(serverUrls)

proxyUser = None
    proxyPassword = None
    if cfg["enableProxyAuth"]:
        proxyUser = cfg["proxyUser"] or None
        proxyPassword = cfg["proxyPassword"] or None

lang = None
    for env in 'LANGUAGE', 'LC_ALL', 'LC_MESSAGES', 'LANG':
        if env in os.environ:
            if not os.environ[env]:
                # sometimes unset
                continue
            lang = os.environ[env].split(':')[0]
            lang = lang.split('.')[0]
            break

s = RetryServer(serverList.server(),
                    refreshCallback=refreshCallback,
                    proxy=proxyHost,
                    username=proxyUser,
                    password=proxyPassword,
                    timeout=timeout)
    s.addServerList(serverList)

s.add_header("X-Up2date-Version", up2dateUtils.version())

if lang:
        s.setlang(lang)

# require CLN-ORG-TRUSTED-SSL-CERT file to be able to authenticate the SSL connections
    need_ca = [ True for i in s.serverList.serverList
                     if urlparse.urlparse(i)[0] == 'https']
    if need_ca:
        for rhns_ca_cert in rhns_ca_certs:
            if not os.access(rhns_ca_cert, os.R_OK):
                msg = "%s: %s" % (_("ERROR: can not find RHNS CA file"),
                                     rhns_ca_cert)
                log.log_me("%s" % msg)
                raise up2dateErrors.SSLCertificateFileNotFound(msg)

# force the validation of the SSL cert
            s.add_trusted_cert(rhns_ca_cert)

clientCaps.loadLocalCaps()

# send up the capabality info
    headerlist = clientCaps.caps.headerFormat()
    for (headerName, value) in headerlist:
        s.add_header(headerName, value)
    return s

def doCall(method, *args, **kwargs):
    log = up2dateLog.initLog()
    log.log_debug("rpcServer: Calling XMLRPC %s" % method.__dict__['_Method__name'])
    cfg = config.initUp2dateConfig()
    ret = None

attempt_count = 1
    try:
        attempts = int(cfg["networkRetries"])
    except ValueError:
        attempts = 1
    if attempts <= 0:
        attempts = 1

while 1:
        failure = 0
        ret = None
        try:
            ret = method(*args, **kwargs)
        except KeyboardInterrupt:
            raise_with_tb(up2dateErrors.CommunicationError(_(
                "Connection aborted by the user")))
        # if we get a socket error, keep tryingx2
        except (socket.error, SSL.socket_error):
            log.log_me("A socket error occurred: %s, attempt #%s" % (
                sys.exc_info()[1], attempt_count))
            if attempt_count >= attempts:
                e = sys.exc_info()[1]
                if len(e.args) > 1:
                    raise_with_tb(up2dateErrors.CommunicationError(e.args[1]))
                else:
                    raise_with_tb(up2dateErrors.CommunicationError(e.args[0]))
            else:
                failure = 1
        except httplib.IncompleteRead:
            print("httplib.IncompleteRead")
            raise_with_tb(up2dateErrors.CommunicationError("httplib.IncompleteRead"))

except urllib2.HTTPError:
            e = sys.exc_info()[1]
            msg = "\nAn HTTP error occurred:\n"
            msg = msg + "URL: %s\n" % e.filename
            msg = msg + "Status Code: %s\n" % e.code
            msg = msg + "Error Message: %s\n" % e.msg
            log.log_me(msg)
            raise_with_tb(up2dateErrors.CommunicationError(msg))

except xmlrpclib.ProtocolError:
            e = sys.exc_info()[1]
            log.log_me("A protocol error occurred: %s , attempt #%s," % (
                e.errmsg, attempt_count))
            if e.errcode == 404:
                log.log_me("Could not find URL, %s" % (e.url))
                log.log_me("Check server name and/or URL, then retry\n");

(errCode, errMsg) = rpclib.reportError(e.headers)
            reset = 0
            if abs(errCode) == 34:
                log.log_me("Auth token timeout occurred\n errmsg: %s" % errMsg)
                # this calls login, which in tern calls doCall (ie,
                # this function) but login should never get a 34, so
                # should be safe from recursion

from up2date_client import up2dateAuth
                up2dateAuth.updateLoginInfo()

# the servers are being throttle to pay users only, catch the
            # exceptions and display a nice error message
            if abs(errCode) == 51:
                log.log_me(_("Server has refused connection due to high load"))
                raise_with_tb(up2dateErrors.CommunicationError(e.errmsg))
            # if we get a 404 from our server, thats pretty
            # fatal... no point in retrying over and over. Note that
            # errCode == 17 is specific to our servers, if the
            # serverURL is just pointing somewhere random they will
            # get a 0 for errcode and will raise a CommunicationError
            if abs(errCode) == 17:
                #in this case, the args are the package string, so lets try to
                # build a useful error message
                if type(args[0]) == type([]):
                    pkg = args[0]
                else:
                    pkg=args[1]

if type(pkg) == type([]):
                    pkgName = "%s-%s-%s.%s" % (pkg[0], pkg[1], pkg[2], pkg[4])
                else:
                    pkgName = pkg
                msg = "File Not Found: %s\n%s" % (pkgName, errMsg)
                log.log_me(msg)
                raise_with_tb(up2dateErrors.FileNotFoundError(msg))

if not reset:
                if attempt_count >= attempts:
                    raise_with_tb(up2dateErrors.CommunicationError(e.errmsg))
                else:
                    failure = 1

except xmlrpclib.ResponseError:
            raise_with_tb(up2dateErrors.CommunicationError(
                "Broken response from the server."))

if ret != None:
            break
        else:
            failure = 1

if failure:
            # rest for five seconds before trying again
            time.sleep(5)
            attempt_count = attempt_count + 1

if attempt_count > attempts:
            raise up2dateErrors.CommunicationError("The data returned from the server was incomplete")

return ret

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