source: fedd/federation/protogeni_proxy.py @ c7a6a20

#!/usr/local/bin/python

import os,sys
import logging

from service_error import service_error
from remote_service import xmlrpc_handler, soap_handler, service_caller

from ssh_emulab_segment import ssh_emulab_segment


class protogeni_proxy(ssh_emulab_segment):
    class ProtoGENIError(Exception): 
        def __init__(self, op, code, output):
            Exception.__init__(self, output)
            self.op = op
            self.code = code
            self.output = output

    def __init__(self, log=None, keyfile=None, debug=False, 
            ch_url=None, sa_url=None, cm_url=None):
        ssh_emulab_segment.__init__(self, log=log, keyfile=keyfile, 
                debug=debug)

        self.ProtoGENIError = protogeni_proxy.ProtoGENIError
        self.ch_url = ch_url
        self.sa_url = sa_url
        self.cm_url = cm_url

        self.call_SetValue = service_caller('SetValue')

        self.debug_fail = []
        self.debug_response = {
                'RedeemTicket': ("XML blob1", "XML blob2"),
                'SliverStatus': { 'status': 'ready' },
                'Resolve': { 
                    'creator_urn': 'debugCreatorURN',
                    'urn': 'debugURN',
                    },
                'GetKeys': [ { 'key': 'k' } ],
                'CreateSliver': 'manifest',
            }


    def pg_call(self, url, method, params, context):
        max_retries = 5
        retries = 0

        s = service_caller(method, request_body_name="", strict=False)
        if self.log:
            self.log.debug("Calling %s %s" % (url, method))
        if not self.debug:
            while retries < max_retries:
                r = s.call_xmlrpc_service(url, params, context=context)
                code = r.get('code', -1)
                if code == 0:
                    # Success leaves the loop here
                    return r.get('value', None)
                elif code == 14 and retries +1 < max_retries:
                    # Busy resource
                    retries+= 1
                    self.log.info("Resource busy, retrying in 30 secs")
                    time.sleep(30)
                else:
                    # NB: out of retries falls through to here
                    raise self.ProtoGENIError(op=method, 
                            code=r.get('code', 'unknown'), 
                            output=r.get('output', 'No output'))
        else:
            if method in self.debug_fail:
                raise self.ProtoGENIError(op=method, code='unknown',
                        output='No output')
            elif self.debug_response.has_key(method):
                return self.debug_response[method]
            else:
                return "%s XML blob" % method

    def clearinghouse_call(self, method, params, context):
        return self.pg_call(self.ch_url, method, params, context)

    def slice_authority_call(self, method, params, context):
        return self.pg_call(self.sa_url, method, params, context)

    def component_manager_call(self, method, params, context):
        return self.pg_call(self.cm_url, method, params, context)