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sdn.py
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# -*- coding: utf-8 -*-
import httplib2
import time
import json
class OdlUtil:
url = ''
def __init__(self, host, port):
self.url = 'http://' + host + ':' + str(port)
def install_flow(self, container_name='default',username="admin", password="admin"):
http = httplib2.Http()
http.add_credentials(username, password)
headers = {'Accept': 'application/json'}
flow_name = 'flow_' + str(int(time.time()*1000))
#s2流表
#在检测h2发包的时候s2的1口流量空闲时发的流表
h2_to_s2_1 ='{"flow": [{"id": "0","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.2/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "1"},"order": "0"}]}}]},'\
'"priority": "101","cookie": "1","table_id": "0"}]}'
#在检测h3发包的时候s2的1口流量空闲时发的流表
h3_to_s2_1 ='{"flow": [{"id": "1","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.3/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "1"},"order": "0"}]}}]},'\
'"priority": "101","cookie": "1","table_id": "0"}]}'
mh3_to_s2_1 ='{"flow": [{"id": "1","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.3/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "1"},"order": "0"}]}}]},'\
'"priority": "100","cookie": "1","table_id": "0"}]}'
#在检测h3发包的时候s2的1口流量满载时发的流表
h3_to_s2_2 ='{"flow": [{"id": "2","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.3/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "2"},"order": "0"}]}}]},'\
'"priority": "101","cookie": "1","table_id": "0"}]}'
mh3_to_s2_2 ='{"flow": [{"id": "2","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.3/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "2"},"order": "0"}]}}]},'\
'"priority": "100","cookie": "1","table_id": "0"}]}'
#s3流表
s3_1='{"flow": [{"id": "0","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.3/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "1"},"order": "0"}]}}]},'\
'"priority": "101","cookie": "1","table_id": "0"}]}'
#s1流表
s1_2To1='{"flow": [{"id": "0","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.2/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "1"},"order": "0"}]}}]},'\
'"priority": "101","cookie": "1","table_id": "0"}]}'
s1_3To1='{"flow": [{"id": "1","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.3/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "1"},"order": "0"}]}}]},'\
'"priority": "101","cookie": "1","table_id": "0"}]}'
headers = {'Content-type': 'application/json'}
num=0
#下发流表，中间的地址可以从ODL控制器页面获得
#先把s1和s3的流表都下了
response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/0', body=s1_2To1, method='PUT',headers=headers)
response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/1', body=s1_3To1, method='PUT',headers=headers)
response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:3/flow-node-inventory:table/0/flow/0', body=s3_1, method='PUT',headers=headers)
#s2调用h2到1的流表
response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:2/flow-node-inventory:table/0/flow/0', body=h2_to_s2_1, method='PUT',headers=headers)
while num < 4 :
#获取s2端口1的流量
uri = 'http://127.0.0.1:8181/restconf/operational/opendaylight-inventory:nodes/node/openflow:2/node-connector/openflow:2:1'
response, content = http.request(uri=uri, method='GET')
content = json.loads(content)
statistics = content['node-connector'][0]['opendaylight-port-statistics:flow-capable-node-connector-statistics']
bytes1 = statistics['bytes']['transmitted']
#1秒后再次获取
time.sleep(1)
response, content = http.request(uri=uri, method='GET')
content = json.loads(content)
statistics = content['node-connector'][0]['opendaylight-port-statistics:flow-capable-node-connector-statistics']
bytes2 = statistics['bytes']['transmitted']
#在检测到s2的1口流量空闲时发的流表
speed=float(bytes2-bytes1)/1
if speed !=0 :#获取有效的速度
if speed < 1000 :
print('s2端口1空闲，h3数据包改为往1口通过')
response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:2/flow-node-inventory:table/0/flow/1', body=h3_to_s2_1, method='PUT',headers=headers)
response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:2/flow-node-inventory:table/0/flow/2', body=mh3_to_s2_2, method='PUT',headers=headers)
#在检测到s2的1口流量满载时发的流表
else :
print('s2端口1满载，h3数据包改为往2口通过')
response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:2/flow-node-inventory:table/0/flow/1', body=mh3_to_s2_1, method='PUT',headers=headers)
response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:2/flow-node-inventory:table/0/flow/2', body=h3_to_s2_2, method='PUT',headers=headers)
odl = OdlUtil('127.0.0.1', '8181')
odl.install_flow()