实验7：基于REST API的SDN北向应用实践

import requests
from requests.auth import HTTPBasicAuth
if name == "main":
url = 'http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/'
headers = {'Content-Type': 'application/json'}
res = requests.delete(url, headers=headers, auth=HTTPBasicAuth('admin', 'admin'))
print (res.content)

class MyTopo(Topo):
def init(self):
# initilaize topology
Topo.init(self)

    self.addSwitch("s1")
    self.addSwitch("s2")

    self.addHost("h1")
    self.addHost("h2")
    self.addHost("h3")
    self.addHost("h4")

    self.addLink("s1", "h1")
    self.addLink("s1", "h2")
    self.addLink("s2", "h3")
    self.addLink("s2", "h4")
    self.addLink("s1", "s2")

topos = {'mytopo': (lambda: MyTopo())}

import requests

if name == "main":
url = 'http://127.0.0.1:8080/stats/flowentry/add'
headers = {'Content-Type': 'application/json'}
flow1 = {
"dpid": 1,
"priority": 1,
"match":{
"in_port": 1
},
"actions":[
{
"type": "PUSH_VLAN",
"ethertype": 33024
},
{
"type": "SET_FIELD",
"field": "vlan_vid",
"value": 4096
},
{
"type": "OUTPUT",
"port": 3
}
]
}
flow2 = {
"dpid": 1,
"priority": 1,
"match":{
"in_port": 2
},
"actions":[
{
"type": "PUSH_VLAN",
"ethertype": 33024
},
{
"type": "SET_FIELD",
"field": "vlan_vid",
"value": 4097
},
{
"type": "OUTPUT",
"port": 3
}
]
}
flow3 = {
"dpid": 1,
"priority": 1,
"match":{
"vlan_vid": 0
},
"actions":[
{
"type": "POP_VLAN",
"ethertype": 33024
},
{
"type": "OUTPUT",
"port": 1
}
]
}
flow4 = {
"dpid": 1,
"priority": 1,
"match": {
"vlan_vid": 1
},
"actions": [
{
"type": "POP_VLAN",
"ethertype": 33024
},
{
"type": "OUTPUT",
"port": 2
}
]
}
flow5 = {
"dpid": 2,
"priority": 1,
"match": {
"in_port": 1
},
"actions": [
{
"type": "PUSH_VLAN",
"ethertype": 33024
},
{
"type": "SET_FIELD",
"field": "vlan_vid",
"value": 4096
},
{
"type": "OUTPUT",
"port": 3
}
]
}
flow6 = {
"dpid": 2,
"priority": 1,
"match": {
"in_port": 2
},
"actions": [
{
"type": "PUSH_VLAN",
"ethertype": 33024
},
{
"type": "SET_FIELD",
"field": "vlan_vid",
"value": 4097
},
{
"type": "OUTPUT",
"port": 3
}
]
}
flow7 = {
"dpid": 2,
"priority": 1,
"match": {
"vlan_vid": 0
},
"actions": [
{
"type": "POP_VLAN",
"ethertype": 33024
},
{
"type": "OUTPUT",
"port": 1
}
]
}
flow8 = {
"dpid": 2,
"priority": 1,
"match": {
"vlan_vid": 1
},
"actions": [
{
"type": "POP_VLAN",
"ethertype": 33024
},
{
"type": "OUTPUT",
"port": 2
}
]
}
res1 = requests.post(url, json.dumps(flow1), headers=headers)
res2 = requests.post(url, json.dumps(flow2), headers=headers)
res3 = requests.post(url, json.dumps(flow3), headers=headers)
res4 = requests.post(url, json.dumps(flow4), headers=headers)
res5 = requests.post(url, json.dumps(flow5), headers=headers)
res6 = requests.post(url, json.dumps(flow6), headers=headers)
res7 = requests.post(url, json.dumps(flow7), headers=headers)
res8 = requests.post(url, json.dumps(flow8), headers=headers)

class GetNodes:
def init(self, ip):
self.ip = ip

def get_switch_id(self):
    url = 'http://' + self.ip + '/stats/switches'
    re_switch_id = requests.get(url=url).json()
    switch_id_hex = []
    for i in re_switch_id:
        switch_id_hex.append(hex(i))

    return switch_id_hex

def getflow(self):
    url = 'http://' + self.ip + '/stats/flow/%d'
    switch_list = self.get_switch_id()
    ret_flow = []
    for switch in switch_list:
        new_url = format(url % int(switch, 16))
        re_switch_flow = requests.get(url=new_url).json()
        ret_flow.append(re_switch_flow)
    return ret_flow

def show(self):
    flow_list = self.getflow()
    for flow in flow_list:
        for dpid in flow.keys():
            dp_id = dpid
            switchnum= '{1}'.format(hex(int(dp_id)), int(dp_id))        
            print('s'+switchnum,end = " ")
            switchnum = int(switchnum)
        for list_table in flow.values():
            for table in list_table:          
                string1 = str(table)
                if re.search("'dl_vlan': '(.*?)'", string1) is not None:
                   num = re.search("'dl_vlan': '(.*?)'", string1).group(1);
                   if num == '0' and switchnum == 1:
                      print('h1',end = " ")
                   if num == '1' and switchnum == 1:
                      print('h2',end = " ")
                   if num == '0' and switchnum == 2:
                      print('h3',end = " ")
                   if num == '1' and switchnum == 2:
                      print('h4',end = " ")
    print("")
    flow_list = self.getflow()
    for flow in flow_list:
        for dpid in flow.keys():
            dp_id = dpid
            print('switch_name:s{1}'.format(hex(int(dp_id)), int(dp_id)))
        for list_table in flow.values():
            for table in list_table:
                print(table)

s1 = GetNodes("127.0.0.1:8080")
s1.show()