source: fedd/federation/geniapi_proxy.py @ f24fc8d

#!/usr/local/bin/python

import os,sys

from M2Crypto.SSL import SSLError
from M2Crypto.m2xmlrpclib import SSL_Transport
from service_error import service_error
from xmlrpclib import ServerProxy, Fault, Error


from protogeni_proxy import protogeni_proxy

from deter import topdl
import list_log

class geniapi_proxy(protogeni_proxy):
    '''
    This exports the same interface as the protogeni_proxy, but uses GENIAPI
    calls when avaliable.  These calls are currently only available only for
    the component manager/aggregate manager.  The keyword arguments of the
    ProtoGENI interface are converted into XMLRPC positional parameters on
    GENIAPI calls.  Tables to do that are established in the constructior.
    '''
    def __init__(self, log=None, keyfile=None, debug=False, 
            ch_url=None, sa_url=None, cm_url=None):
        protogeni_proxy.__init__(self, log, keyfile, debug, ch_url, sa_url,
                cm_url)

        def get_key(k, d):
            '''
            Return a function that takes a dict and returns the value bound to
            key k or the default d
            '''
            return lambda x : x.get(k, d)

        def user_filter(params):
            '''
            Take a dict assumed to hold a key 'users' that is a dict of a urn
            (keyed by 'urn' and a list of dicts describing ssh keys (keyed by
            'key'.  Construct a list of dicts with the same 'urn' and a 'keys'
            value holding only the 'key' value of the subdict.  This converts
            ProtoGENI users to GENIAPI users.
            '''

            # That conversion is a nested list comprehension.
            return [ { 
                'urn': u.get('urn', ''), 
                'keys': [ k.get('key', '') for k in u.get('keys', []) ] 
                } for u in params.get('users', [])]

        self.ProtoGENIError = protogeni_proxy.ProtoGENIError
        # These ProtoGENI requests are mapped to the given GENIAPI request.
        self.method_map = { 
                'DeleteSlice': 'DeleteSliver',
                'RenewSlice': 'RenewSliver',
                }
        # Conversion tables for changing the dict of keyword arguments into a
        # list of arguments for GENIAPI.  The list of positional params is
        # created by calling the functions in the dict below (keyed by the
        # requested function) in order on the params dict, placing the results
        # into the arguments list.  The list so constructed is the positional
        # parameters in order.  Mostly this is just putting the right key in
        # the right place, but the users choice is actually reformatted some.
        # This dict is indexed by ProtoGENI method.
        self.arg_map = {
                'CreateSliver': [
                    get_key('slice_urn', ''), 
                    get_key('credentials', []), 
                    get_key('rspec', ''), 
                    user_filter ],
                'SliverStatus': [
                    get_key('slice_urn', ''),
                    get_key('credentials','') ],
                'DeleteSlice': [
                    get_key('slice_urn', ''),
                    get_key('credentials','') ],
                'RenewSlice': [
                    get_key('slice_urn', ''),
                    get_key('credentials','') ],
                }

    def geniapi_call(self, url, method, params, context):
        '''
        Make an SSL authenticated (and encrypted) GENIAPI call on the given url.
        '''
        try:
            if self.log:
                self.log.debug("Calling %s %s" % (url, method))
            transport = SSL_Transport(context)
            port = ServerProxy(url, transport=transport)
            remote_method = getattr(port, method, None)
            if remote_method is not None:
                return remote_method(*params)
            else:
                raise service_error(service_error.internal, 
                        "Bad method: %s" % method)
        except Fault, f:
            raise service_error(f.faultCode, f.faultString)
        except Error, e:
            raise service_error(service_error.protocol, 
                    "Remote XMLRPC Fault: %s" % e)
        except:
            raise self.ProtoGENIError(op=method, code=-1, 
                    output="%s" % sys.exc_info()[1])


    def component_manager_call(self, method, params, context):
        '''
        Convert the ProtoGENI call into a GENIAPI call using the translation
        tables above.
        '''
        if not self.debug:
            gmethod = self.method_map.get(method, method)
            gparams = [f(params) for f in self.arg_map.get(method, [])]

            return self.geniapi_call(self.cm_url, gmethod, gparams, context)
        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