ryu控制器REST API的使用
1 准备工作
首先运行ryu控制器
sudo ryu-manager --verbose ofctl_rest.py rest_topology.py simple_switch.py --observe-links
运行mininet拓扑
sudo mn --controller remote --topo tree,depth=2
2 rest api的使用
api查看的方式可以使用curl命令、浏览器、谷歌的POSTMAN插件、火狐的httprequester插件均可。localhost为本机ryu控制器的ip，根据需要修改即可。另外，推荐几篇参考博客：
https://blog.csdn.net/guizaijianchic/article/details/52971560
http://ryu.readthedocs.io/en/latest/app/ofctl_rest.html#add-a-flow-entry
http://www.tuicool.com/articles/VZVBZbQ
http://www.sdnlab.com/11552.html
http://www.sdnlab.com/11563.html
（1）查看拓扑结构
url：http://localhost:8080/v1.0/topology/links
不过只能显示交换机之间的链路信息，无法显示主机的链路信息。
（2） 查看拓扑中的交换机
url：http://localhost:8080/stats/switches
（3）查看交换机1的流表信息
url：http://localhost:8080/stats/flow/1
（4） 查看交换机1的状态描述
url：http://localhost:8080/stats/desc/1
（5）查看交换机1的流量统计信息
url：http://localhost:8080/stats/aggregateflow/1
（6）查看交换机1的端口统计信息
url：http://localhost:8080/stats/port/1
（7）未完待续
3 调用代码
推荐一篇不错的博客，Ryu基本操作的REST API调用示例：http://www.bubuko.com/infodetail-946012.html
下面是摘抄的该博客文章中的代码，感觉挺有用。
如有侵权，请留言或联系我立刻删除。
import urllib2
import json
def get_all_switches():
url = "http://127.0.0.1:8080/v1.0/topology/switches"
req = urllib2.Request(url)
res_data = urllib2.urlopen(req)
res = res_data.read()
res = json.loads(res)
return res
def get_all_links():
url = "http://127.0.0.1:8080/v1.0/topology/links"
req = urllib2.Request(url)
res_data = urllib2.urlopen(req)
res = res_data.read()
res = json.loads(res)
return res
def get_switch(dpid):
url = "http://127.0.0.1:8080/v1.0/topology/switches/" + dpid
req = urllib2.Request(url)
res_data = urllib2.urlopen(req)
res = res_data.read()
res = json.loads(res)
return res
def get_flow_entries(dpid):
url = "http://127.0.0.1:8080/stats/flow/" + dpid
req = urllib2.Request(url)
res_data = urllib2.urlopen(req)
res = res_data.read()
res = json.loads(res)
return res
def add_flow_entry(dpid,match,priority,actions):
url = "http://127.0.0.1:8080/stats/flowentry/add"
post_data = "{'dpid':%s,'match':%s,'priority':%s,'actions':%s}" % (dpid,str(match),priority,str(actions))
req = urllib2.Request(url,post_data)
res = urllib2.urlopen(req)
return res.getcode()
def delete_flow_entry(dpid, match=None, priority=None, actions=None):
url = "http://127.0.0.1:8080/stats/flowentry/delete"
post_data = "{'dpid':%s" % dpid
if match is not None:
post_data += ",'match':%s" % str(match)
if priority is not None:
post_data += ",'priority':%s" % priority
if actions is not None:
post_data += ",'actions':%s" % str(actions)
post_data += "}"
req = urllib2.Request(url,post_data)
res = urllib2.urlopen(req)
return res.getcode()函数说明：
#get_all_switches()
参数：无
返回结果：一个包含所有交换机信息的列表
结果示例：
[{"ports": [{"hw_addr": "12:ad:47:17:6d:1d", "name": "s1-eth1", "port_no": "00000001", "dpid": "0000000000000001"}, {"hw_addr": "62:bf:89:79:68:67", "name": "s1-eth2", "port_no": "00000002", "dpid": "0000000000000001"}], "dpid": "0000000000000001"}, {"ports": [{"hw_addr": "da:d7:cb:f8:a4:7f", "name": "s2-eth1", "port_no": "00000001", "dpid": "0000000000000002"}, {"hw_addr": "ce:31:74:a1:c1:2d", "name": "s2-eth2", "port_no": "00000002", "dpid": "0000000000000002"}], "dpid": "0000000000000002"}, {"ports": [{"hw_addr": "ea:c5:e8:ee:72:f7", "name": "s3-eth1", "port_no": "00000001", "dpid": "0000000000000003"}, {"hw_addr": "da:57:80:b2:74:67", "name": "s3-eth2", "port_no": "00000002", "dpid": "0000000000000003"}], "dpid": "0000000000000003"}]
#get_all_links()
参数：无
返回结果：一个包含所有链路信息的列表
结果示例：
[{"src": {"hw_addr": "12:ad:47:17:6d:1d", "name": "s1-eth1", "port_no": "00000001", "dpid": "0000000000000001"}, "dst": {"hw_addr": "da:d7:cb:f8:a4:7f", "name": "s2-eth1", "port_no": "00000001", "dpid": "0000000000000002"}}, {"src": {"hw_addr": "ea:c5:e8:ee:72:f7", "name": "s3-eth1", "port_no": "00000001", "dpid": "0000000000000003"}, "dst": {"hw_addr": "ce:31:74:a1:c1:2d", "name": "s2-eth2", "port_no": "00000002", "dpid": "0000000000000002"}}, {"src": {"hw_addr": "da:d7:cb:f8:a4:7f", "name": "s2-eth1", "port_no": "00000001", "dpid": "0000000000000002"}, "dst": {"hw_addr": "12:ad:47:17:6d:1d", "name": "s1-eth1", "port_no": "00000001", "dpid": "0000000000000001"}}, {"src": {"hw_addr": "ce:31:74:a1:c1:2d", "name": "s2-eth2", "port_no": "00000002", "dpid": "0000000000000002"}, "dst": {"hw_addr": "ea:c5:e8:ee:72:f7", "name": "s3-eth1", "port_no": "00000001", "dpid": "0000000000000003"}}]
#get_switch(dpid)
参数：dpid为字符串，比如"0000000000000001"
返回结果：一个包含dpid对应的交换机的信息的列表
结果示例：
[{"ports": [{"hw_addr": "12:ad:47:17:6d:1d", "name": "s1-eth1", "port_no": "00000001", "dpid": "0000000000000001"}, {"hw_addr": "62:bf:89:79:68:67", "name": "s1-eth2", "port_no": "00000002", "dpid": "0000000000000001"}], "dpid": "0000000000000001"}]
#get_flow_entries(dpid)
参数：dpid为字符串，比如"0000000000000001"
返回结果：一个包含流表项的字典
结果示例：
{"1": [{"actions": ["OUTPUT:65533"], "idle_timeout": 0, "cookie": 0, "packet_count": 2252, "hard_timeout": 0, "byte_count": 114852, "duration_nsec": 370000000, "priority": 65535, "duration_sec": 2026, "table_id": 0, "match": {"dl_type": 35020, "nw_dst": "0.0.0.0", "dl_vlan_pcp": 0, "dl_src": "00:00:00:00:00:00", "nw_tos": 0, "tp_src": 0, "dl_vlan": 0, "nw_src": "0.0.0.0", "nw_proto": 0, "tp_dst": 0, "dl_dst": "01:80:c2:00:00:0e", "in_port": 0}}, {"actions": ["OUTPUT:2"], "idle_timeout": 0, "cookie": 0, "packet_count": 0, "hard_timeout": 0, "byte_count": 0, "duration_nsec": 864000000, "priority": 1111, "duration_sec": 104, "table_id": 0, "match": {"dl_type": 0, "nw_dst": "0.0.0.0", "dl_vlan_pcp": 0, "dl_src": "00:00:00:00:00:00", "nw_tos": 0, "tp_src": 0, "dl_vlan": 0, "nw_src": "0.0.0.0", "nw_proto": 0, "tp_dst": 0, "dl_dst": "00:00:00:00:00:00", "in_port": 1}}]}
其中开头的“1”表示dpid号
#add_flow_entry(dpid,match,priority,actions)
参数：
dpid为字符串，比如"0000000000000001"
match为字典，比如match = {"in_port":00000001}，其他键的名称见《ryu Documentation》P161的Flow Match Structure
priority为字符串，比如"1111"
actions为列表，比如actions = [{"type":"OUTPUT","port":00000002}]，其他元素名称见《ryu Documentation》P282的actions
返回结果：整数，HTTP状态码,200表示添加流表项成功
结果示例：200,403,404
#delete_flow_entry(dpid,match,priority,actions)
参数：
dpid为字符串，比如"0000000000000001"
match为字典，比如match = {"in_port":00000001}，其他键的名称见《ryu Documentation》P161的Flow Match Structure
priority为字符串，比如"1111"
actions为列表，比如actions = [{"type":"OUTPUT","port":00000002}]，其他元素名称见《ryu Documentation》P282的actions
返回结果：整数，HTTP状态码，200表示删除流表项成功
结果示例：200,403,404