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#
# Emulab support for Rhumba
#
# Sander Vrijders <sander.vrijders@intec.ugent.be>
# Wouter Tavernier <wouter.tavernier@intec.ugent.be>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301 USA
import os
import time
import re
from ast import literal_eval
from ssh_support import *
import rhumba
import warnings
warnings.filterwarnings("ignore")
# Represents an emulab testbed info
#
# @url [string] URL of the testbed
# @image [string] specific image to use
#
class EmulabTestbed(rhumba.Testbed):
def __init__(self, exp_name, username, password = "",
proj_name = "ARCFIRE", url = "wall1.ilabt.iminds.be",
image = "UBUNTU14-64-STD"):
rhumba.Testbed.__init__(self, exp_name, username, password, proj_name)
self.url = url
self.image = image
def ops_server(self):
'''
Return server name of the ops-server (is testbed specific)
@param self: testbed info
@return: server name of the ops-server
'''
return 'ops.' + self.url
def full_name(self, node_name):
'''
Return server name of a node
@param node_name: name of the node
@param self: testbed info
@return: server name of the node
'''
return node_name + '.' + self.exp_name + '.' + \
self.proj_name + '.' + self.url
def get_experiment_list(self, project_name = None):
'''
Get list of made emulab experiments accessible with your credentials
@param self: testbed info
@param project_name: optional filter on project
@return: list of created experiments (strings)
'''
cmd = '/usr/testbed/bin/sslxmlrpc_client.py -m experiment getlist'
out = execute_command(self, self.ops_server(), cmd)
try:
if project_name != None:
return literal_eval(out)[project_name][project_name]
else:
return literal_eval(out)
except:
return { project_name: { project_name: [] }}
def swap_exp_in(self):
'''
Swaps experiment in
@param self: testbed info
'''
cmd = '/usr/testbed/bin/sslxmlrpc_client.py swapexp proj=' + \
self.proj_name + \
' exp=' + \
self.exp_name + \
' direction=in'
output = execute_command(self, self.ops_server(), cmd)
return output
def _create_experiment(self, nodes, links):
'''
Creates an emulab experiment
@param self: testbed info
@param nodes: holds the nodes in the experiment
@param links: holds the links in the experiment
'''
proj_name = self.proj_name
exp_name = self.exp_name
exp_list = self.get_experiment_list()
try:
if exp_name in exp_list[proj_name][proj_name]:
print("Experiment already exists.")
return
except:
print("First experiment to be created for that project.")
ns = self.generate_ns_script(nodes, links)
dest_file_name = '/users/'+ self.username + \
'/temp_ns_file.%s.ns' % os.getpid()
copy_file_to_testbed(self, self.ops_server(), ns, dest_file_name)
cmd = '/usr/testbed/bin/sslxmlrpc_client.py startexp ' + \
'batch=false wait=true proj="' + proj_name + \
'" exp="' + exp_name + '" noswapin=true ' + \
'nsfilepath="' + dest_file_name + '"'
execute_command(self, self.ops_server(), cmd, time_out = None)
execute_command(self, self.ops_server(),'rm ' + dest_file_name)
print("New experiment succesfully created.")
def generate_ns_script(self, nodes, p2plinks):
'''
Generate ns script based on network graph.
Enables to customize default node image.
@param nodes: holds the nodes in the experiment
@param links: holds the links in the experiment
@param self: testbed info
@return: ns2 script for Emulab experiment
'''
ns2_script = "# ns script generated by Rhumba\n"
ns2_script += "set ns [new Simulator]\n"
ns2_script += "source tb_compat.tcl\n"
for node in nodes:
ns2_script += "set " + node.name + " [$ns node]\n"
ns2_script += "tb-set-node-os $" + node.name + " " + \
self.image + "\n"
for link in p2plinks:
ns2_script += "set " + link.name + \
" [$ns duplex-link $" + \
link.node_a.name + " $" + \
link.node_b.name + " 1000Mb 0ms DropTail]\n"
ns2_script += "$ns run\n"
return ns2_script
def wait_until_nodes_up(self):
'''
Checks if nodes are up
@param self: testbed info
'''
print("Waiting until all nodes are up")
cmd = '/usr/testbed/bin/script_wrapper.py expinfo -e' + \
self.proj_name + \
',' + \
self.exp_name + \
' -a | grep State | cut -f2,2 -d " "'
res = execute_command(self, self.ops_server(), cmd)
active = False
if res == "active":
active = True
while active != True:
res = execute_command(self, self.ops_server(), cmd)
if res == "active":
active = True
print("Still waiting")
time.sleep(5)
def complete_experiment_graph(self, nodes, p2plinks):
'''
Gets the interface (ethx) to link mapping
@param self: testbed info
@param nodes: holds the nodes in the experiment
@param links: holds the links in the experiment
'''
node_full_name = full_name(self, nodes[0].name)
cmd = 'cat /var/emulab/boot/topomap'
topomap = execute_command(self, node_full_name, cmd)
# Almost as ugly as yo momma
index = topomap.rfind("# lans")
topo_array = topomap[:index].split('\\n')[1:-1]
# Array contains things like 'r2b1,link7:10.1.6.3 link6:10.1.5.3'
for item in topo_array:
item_array = re.split(',? ?', item)
node_name = item_array[0]
for item2 in item_array[1:]:
item2 = item2.split(':')
link_name = item2[0]
link_ip = item2[1]
for link in p2plinks:
if link.name == link_name:
if link.node_a.name == node_name:
link.int_a.ip = link_ip
elif link.node_b.name == node_name:
link.int_b.ip = link_ip
for node in nodes:
cmd = 'cat /var/emulab/boot/ifmap'
node_full_name = full_name(self, node.name)
output = execute_command(self, node_full_name, cmd)
output = re.split('\\\\n', output)
for item in output:
item = item.split()
for link in p2plinks:
if link.node_a.name == node.name and \
link.int_a.ip == item[1]:
link.int_a.name = item[0]
elif link.node_b.name == node.name and \
link.int_b.ip == item[1]:
link.int_b.name = item[0]
node.full_name = self.full_name(node.name)
def create_experiment(self, nodes, links):
self._create_experiment(nodes, links)
self.swap_exp_in()
self.wait_until_nodes_up()
es.complete_experiment_graph(nodes, links)
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