def refresh_handler(data):
#send the topo which is changed.
network_number = 1
node_number = 2
port_number = 4
link_number = 1
flow_path_number = 1
update_msg = ofpew.ofpew_update(network_number = network_number)
network_msg = ofpew.ofpew_network_view(node_number = node_number, port_number = port_number,
link_number = link_number,flow_path_number = flow_path_number)
node_msg_1 = ofpew.ofpew_node(datapath_id = 1)
node_msg_2 = ofpew.ofpew_node(datapath_id = 2)
port_msg_1 = ofpew.ofpew_port(port_id = 1,node_id = 1)
port_msg_2 = ofpew.ofpew_port(port_id = 2,node_id = 2)
port_msg_3 = ofpew.ofpew_port(port_id = 3,node_id = 1)
port_msg_4 = ofpew.ofpew_port(port_id = 4,node_id = 2)
link_msg = ofpew.ofpew_link(link_id = 1,src_node_id = 1, src_port_id = 1,dst_node_id = 2, dst_port_id = 2)
flow_path_msg = ofpew.ofpew_flow_path(flow_path_id = 1, src_in_port_id =3,src_node_id =1, src_out_port_id = 1,
dst_node_id = 2,dst_in_port_id = 2 ,dst_out_port_id = 4)
header = ofpew.ofpew_header(type = 5)
#we encapsulate the packet.
msg = header/update_msg/network_msg/node_msg_1/node_msg_2/port_msg_1/port_msg_2/port_msg_3/port_msg_4/link_msg/flow_path_msg
msg.length = len(msg)
print "*****\n send update messages\n*****"
msg.show()
return msg
def refresh_handler(data):
#send the topo which is changed.
network_number = 1
node_number = 2
port_number = 4
link_number = 1
flow_path_number = 1
length = len(ofpew.ofpew_header())+len(ofpew.ofpew_update())+len(ofpew.ofpew_network_view())*network_number
+len(ofpew.ofpew_node())*node_number+len(ofpew.ofpew_port())*port_number
+len(ofpew.ofpew_link())*link_number+len(ofpew.ofpew_flow_path())*flow_path_number
def update_handler(data):
#manipulate the messenge
header = ofpew.ofpew_header(data[0:8])
data = data[8:]
print "update_handler"
update_msg = ofpew.ofpew_update(data[0:8])
data = data[8:]
for x in xrange(update_msg.network_number):
offset = 0
network_view = ofpew.ofpew_network_view(data[0:16])
network[x] = network_view #store the network_view
network_view.show()
#offset = 16+network_view.node_number*28+network_veiw.link_number*48 +network_view.port_number*36 +network_view.flow_path_number*60
offset = 16
data = data[offset:]
#we need to make sure the offset of network object.
for i in xrange(network_view.node_number):
#store the nodes of this network
node_t = ofpew.ofpew_node(data[(i-1)*28:i*28])
#node_t.show()
nodes[node_t.datapath_id] = node_t
offset = 28*network_view.node_number
data = data[offset:]
for k in xrange(network_view.port_number):
#store the ports of this network
port_t = ofpew.ofpew_port(data[(k-1)*36:k*36])
#port_t.show()
ports[port_t.port_id] = port_t
offset = 36*network_view.port_number
data = data[offset:]
for j in xrange(network_view.link_number):
#store the links of this network
link_t = ofpew.ofpew_link(data[(j-1)*48:j*48])
#link_t.show()
links[link_t.link_id] = link_t
offset = 48*network_view.link_number
data = data[offset:]
for y in xrange(network_view.flow_path_number):
#store the flwo_paths of this network
flow_path_t = ofpew.ofpew_flow_path(data[(y-1)*60:y*60])
#flow_path_t.show()
flow_paths[flow_path_t.flow_path_id] = flow_path_t
offset = 60* network_view.flow_path_number
data = data[offset:]
return None
def msg_handler(data):
rmsg = ofpew.ofpew_header(data[0:8])
body = data[8:]
if rmsg.type == 0:
#"OFPEW_HELLO"
hello_handler()
return refresh_handler(data) #send the topo
elif rmsg.type == 1:
# "OFPEW_ERROR"
return error_handler(data)
elif rmsg.type == 2:
# "OFPEW_ECHO_REQUEST"
return echo_request_handler(data)
elif rmsg.type == 3:
# "OFPEW_ECHO_REPLY"
#send echo request periodic.
return echo_reply_handler(data)
elif rmsg.type == 4:
#"OFPEW_VENDOR",
return vendor_handler(data)
elif rmsg.type == 5:
#"OFPEW_UPDATE"
#read and store messenge.
print "do something"
return update_handler(data)
elif rmsg.type == 6:
#"OFPEW_NOTIFICATION"
return notification_handler(data)
elif rmsg.type == 7:
#"OFPEW_REFRESH_VIEW"
#ofpew_refresh_view without any body. Just has a header.
#receive the refresh messenge and return new topo of update messenge by refresh_handler.
return refresh_handler(data)
elif rmsg.type == 8:
#"OFPEW_GOING_DOWN"
return down_handler(data)
def update_handler(data):
#manipulate the messenge
print "update_handler"
header = ofpew.ofpew_header(data[0:8])
data = data[8:]
update_msg = ofpew.ofpew_update(data[0:8])
data = data[8:]
for x in xrange(update_msg.network_number):
network_view = ofpew.ofpew_network_view(data[0:16])
network[x] = network_view #store the network_view
network_view.show()
data = data[16:]
#we need to make sure the offset of network object.
for i in xrange(network_view.node_number):
#store the nodes of this network
node_t = ofpew.ofpew_node(data[0:*28])
#node_t.show()
nodes[node_t.datapath_id] = node_t
data =data[28:]
for k in xrange(network_view.port_number):
#store the ports of this network
port_t = ofpew.ofpew_port(data[0:36])
#port_t.show()
ports[port_t.port_id] = port_t
data = data[36:]
for j in xrange(network_view.link_number):
#store the links of this network
link_t = ofpew.ofpew_link(data[0:48])
#link_t.show()
links[link_t.link_id] = link_t
data = data[48:]
for y in xrange(network_view.flow_path_number):
#store the flwo_paths of this network
flow_path_t = ofpew.ofpew_flow_path(data[0:60])
#flow_path_t.show()
flow_paths[flow_path_t.flow_path_id] = flow_path_t
data =data[60:]
return None
def echo_request_handler(data):
print "OFPEW_ECHO_REPLY"
msg = ofpew.ofpew_header(type = 3,length = 8)
return msg
def echo_handler():#send echo request.
print "OFPEW_ECHO_REQUEST"
msg = ofpew.ofpew_header(type = 2,length = 8)#send the ofpew_echo_request period.
return msg
update_msg = ofpew.ofpew_update(network_number = network_number)
network_msg = ofpew.ofpew_network_view(node_number = node_number, port_number = port_number,
link_number = link_number,flow_path_number = flow_path_number)
node_msg_1 = ofpew.ofpew_node(datapath_id = 1)
node_msg_2 = ofpew.ofpew_node(datapath_id = 2)
port_msg_1 = ofpew.ofpew_port(port_id = 1,node_id = 1)
port_msg_2 = ofpew.ofpew_port(port_id = 2,node_id = 2)
port_msg_3 = ofpew.ofpew_port(port_id = 3,node_id = 1)
port_msg_4 = ofpew.ofpew_port(port_id = 4,node_id = 2)
link_msg = ofpew.ofpew_link(link_id = 1,src_node_id = 1, src_port_id = 1,dst_node_id = 2, dst_port_id = 2)
flow_path_msg = ofpew.ofpew_flow_path(flow_path_id = 1, src_in_port_id =3,src_node_id =1, src_out_port_id = 1,
dst_node_id = 2,dst_in_port_id = 2 ,dst_out_port_id = 4)
header = ofpew.ofpew_header(type = 5, length =length)
#we encapsulate the packet.
msg = header/update_msg/network_msg/node_msg_1/node_msg_2/port_msg_1/port_msg_2/port_msg_3/port_msg_4/link_msg/flow_path_msg
print "*****\n send update messages\n*****"
msg.show()
return msg
def hello_handler():
print "OFPEW_HELLO"
return None
def echo_handler():#send echo request.
print "OFPEW_ECHO_REQUEST"
msg = ofpew.ofpew_header(type = 2,length = 8)#send the ofpew_echo_request period.
return msg
def echo_request_handler(data):