source: fedd/federation/emulab_segment.py @ e11f4e0

#!/usr/local/bin/python

import logging 
import util

from M2Crypto import SSL
from M2Crypto.m2xmlrpclib import SSL_Transport
from xmlrpclib import ServerProxy, dumps, loads, Fault, Error, Binary
from M2Crypto.SSL import SSLError
from M2Crypto.BIO import BIOError
from socket import error as socket_error
from socket import sslerror
import httplib
from federation.util import fedd_ssl_context
from federation import service_error

class emulab_segment:
    def __init__(self, boss, cert):
        self.ctxt = fedd_ssl_context(my_cert=cert)
        self.ctxt.set_verify(SSL.verify_none, 10)
        self.boss = boss
        self.null = """
set ns [new Simulator]
source tb_compat.tcl

set a [$ns node]

$ns rtproto Session
$ns run 
"""
        self.log =  getattr(self, 'log', None) 
        self.debug = getattr(self, 'debug', False)

    def emulab_call(self, method, params):
        VERSION = 0.1
        try:
            transport = SSL_Transport(self.ctxt)
            port = ServerProxy(self.boss, transport=transport)
            remote_method = getattr(port, method, None)
            if remote_method is not None:
                resp = remote_method(VERSION, params)
            else:
                raise service_error(service_error.internal, 
                        "Bad method: %s" % method)
        except socket_error, e:
            raise service_error(service_error.connect, 
                    "Cannot connect to %s: %s" % (url, e[1]))
            raise e
        except BIOError, e:
            if self.log:
                self.log.warn("BIO error contacting %s: %s" % (url, e))
            raise e
        except sslerror, e:
            if self.log:
                self.log.warn("SSL (socket) error contacting %s: %s" % 
                        (url, e))
            raise e
        except SSLError, e:
            if self.log:
                self.log.warn("SSL error contacting %s: %s" % (url, e))
            raise e
        except httplib.HTTPException, e:
            if self.log:
                self.log.warn("HTTP error contacting %s: %s" % (url, e))
            raise e
        except Fault, f:
            raise service_error(f.faultCode, f.faultString)
        except Error, e:
            raise service_error(service_error.protocol, 
                    "Remote XMLRPC Fault: %s" % e)

        code = resp.get('code', -1)
        if code ==0:
            return (code, resp.get('value', None))
        else:
            return (code, resp.get('output', None))

    def get_state(self, pid, eid):
        """
        Return the state of the experiment as reported by emulab
        """

        if self.debug:
            state = 'swapped'
        else:
            params =  { 'proj': pid, 'exp': eid }
            code, state = self.emulab_call('experiment.state', params)
            if code != 0:
                state = 'none'

        if self.log:
            self.log.debug("State is %s" % state)
        return state

    def make_null_experiment(self, pid, eid, tmpdir):
        """
        Create a null copy of the experiment so that we capture any logs there
        if the modify fails.  Emulab software discards the logs from a failed
        startexp.
        """

        if self.debug:
            if self.log:
                self.log("[make_null_experiment]: (debug) Creating experiment")
            return True
        else:
            params = {
                    'proj': pid,
                    'exp': eid, 
                    'nsfilestr': self.null,
                    'batch': False,
                    'idleswap': 0,
                    'noidleswap_reason': 'Federated experiment',
                    'noswapin': True,
                    'wait': True
                    }
            if self.log:
                self.log("[make_null_experiment]: Creating experiment")
            code, value = self.emulab_call('experiment.startexp', params)

            if self.log:
                if code == 0: 
                    self.log.info('[make_null_experiment]: Create succeeded')
                else: 
                    self.log.error('[make_null_experiment]: Create failed: %s' \
                            % value)

            return code == 0

    def swap_exp(self, pid, eid, direction='out', wait=True):
        """
        Swap experiment in.
        """
        if self.debug:
            if self.log:
                self.log.info("[swap_exp]: (debug) Swapping %s %s" % \
                        (eid, direction))
            return True
        else:
            if self.log:
                self.log.info("[swap_exp]: Swapping %s %s" % (eid, direction))
            params = {
                    'proj': pid,
                    'exp': eid,
                    'direction': direction,
                    'wait': wait,
                    }
            code, value = self.emulab_call('experiment.swapexp', params)

            if self.log:
                if code == 0: self.log.info('[swap_exp]: Swap succeeded')
                else: self.log.error('[swap_exp]: Swap failed: %s' % value)

        return code == 0

    def modify_exp(self, pid, eid, tcl, wait=True):
        if self.debug:
            self.log.info("[modify_exp]: (debug) Modifying %s" % eid)
            return True
        else:
            self.log.info("[modify_exp]: Modifying %s" % eid)
            params = {
                    'proj': pid,
                    'exp': eid,
                    'nsfilestr': tcl,
                    'wait': wait,
                    'reboot': True,
                    'restart_eventsys': True,
                    }
            code, value = self.emulab_call('experiment.modify', params)
            if self.log:
                if code == 0: 
                    self.log.info('[modify_exp]: Modify succeeded')
                else: 
                    self.log.error('[modify_exp]: Modify failed: %s' \
                            % value)
            return code == 0


    def get_mapping(self, pid, eid):
        """
        Get the physical to virtual mapping from the expinfo command and save
        it in the self.map member.
        """

        if self.debug:
            if self.log:
                self.log.info("[get_mapping] (debug) Generating mapping")
                return True
        else:
            if self.log:
                self.log.info("[get_mapping] Generating mapping")

            params = {
                    'proj': pid,
                    'exp': eid,
                    'aspect': 'mapping'
                    }
            code, nodes = self.emulab_call('experiment.info', params)
            if code ==0:
                for k, v in nodes.items():
                    if v.get('erole', False) and 'pnode' in v:
                        self.node[k] = v['pnode']
                if self.log:
                    self.log.info("Mapping complete")
                return True
            else:
                raise service_error(service_error.internal,
                        "Cannot get node mapping of segment:%s/%s" % (pid, eid))