为什么80%的码农都做不了架构师？>>> 
Kong插件
Kong的插件支持四种维度，执行顺序从上到下，另需注意，如果同一个插件在不同维度都配置过，只会执行一次：
- 应用在Api加上消费者组合；
- 应用在消费者；
- 应用在Api；
- 应用在全局；
另外也不是所有插件都支持定义消费者
再添加一个Api供测试
再添加一个新接口：
POST http://192.168.0.181:8001/apis/
#参数
name:spring-boot-consul-service2
upstream_url:http://spring-boot-consul-service2.service.dc1.consul:17004
methods:GET
uris:/user
{
"created_at": 1515055457572,
"strip_uri": true,
"id": "a99919d1-0770-40a1-81a9-e3c31fd9d282",
"name": "spring-boot-consul-service2",
"methods": [
"GET"
],
"http_if_terminated": false,
"preserve_host": false,
"upstream_url": "http://spring-boot-consul-service2.service.dc1.consul:17004",
"uris": [
"/user"
],
"upstream_send_timeout": 60000,
"upstream_connect_timeout": 60000,
"upstream_read_timeout": 60000,
"retries": 5,
"https_only": false
}
添加steams
POST http://192.168.0.181:8001/upstreams/
#参数
name:spring-boot-consul-service2.service.dc1.consul
{
"created_at": 1515055993113,
"orderlist": [
41,
28,
44,
14,
79,
38,
30,
69,
15,
88,
72,
53,
89,
47,
81,
43,
60,
91,
92,
100,
98,
55,
12,
40,
9,
31,
84,
24,
36,
39,
96,
74,
6,
8,
93,
99,
78,
34,
49,
37,
61,
76,
33,
35,
32,
77,
70,
26,
52,
87,
73,
23,
57,
25,
17,
90,
62,
82,
19,
75,
50,
4,
51,
42,
65,
66,
63,
3,
1,
68,
94,
67,
20,
80,
54,
7,
5,
16,
85,
13,
46,
10,
97,
22,
48,
11,
27,
86,
18,
59,
83,
21,
56,
95,
2,
64,
58,
71,
45,
29
],
"id": "6b8bc38a-d449-47bf-8b8c-19b888e282d4",
"name": "spring-boot-consul-service2.service.dc1.consul",
"slots": 100
}
添加targets
POST http://192.168.0.181:8001/upstreams/spring-boot-consul-service2.service.dc1.consul/targets
#参数
target:192.168.0.184:17004
weight:15
target:192.168.0.185:17004
weight:15
target:192.168.0.186:17004
weight:15
tagets信息
{
"total": 3,
"data": [
{
"created_at": 1515056103599,
"id": "994e7886-3e48-45cb-80ad-3f7918ede007",
"upstream_id": "6b8bc38a-d449-47bf-8b8c-19b888e282d4",
"target": "192.168.0.186:17004",
"weight": 15
},
{
"created_at": 1515056109570,
"id": "03b477ee-a69d-49ee-9892-276f451c373c",
"upstream_id": "6b8bc38a-d449-47bf-8b8c-19b888e282d4",
"target": "192.168.0.185:17004",
"weight": 15
},
{
"created_at": 1515056112730,
"id": "8ace8d83-4504-4334-ad04-f0b536963df9",
"upstream_id": "6b8bc38a-d449-47bf-8b8c-19b888e282d4",
"target": "192.168.0.184:17004",
"weight": 15
}
]
}
目前Api列表如下：
{
"total": 2,
"data": [
{
"created_at": 1515055457572,
"strip_uri": true,
"id": "a99919d1-0770-40a1-81a9-e3c31fd9d282",
"name": "spring-boot-consul-service2",
"methods": [
"GET"
],
"http_if_terminated": false,
"https_only": false,
"upstream_url": "http://spring-boot-consul-service2.service.dc1.consul:17004",
"uris": [
"/user"
],
"preserve_host": false,
"upstream_connect_timeout": 60000,
"upstream_read_timeout": 60000,
"upstream_send_timeout": 60000,
"retries": 5
},
{
"created_at": 1514995615974,
"strip_uri": true,
"id": "b8431831-6a77-434e-ac4a-7e379550714f",
"name": "spring-boot-consul-service",
"methods": [
"GET"
],
"http_if_terminated": false,
"https_only": false,
"upstream_url": "http://spring-boot-consul-service.service.dc1.consul:17003",
"uris": [
"/service"
],
"preserve_host": false,
"upstream_connect_timeout": 60000,
"upstream_read_timeout": 60000,
"upstream_send_timeout": 60000,
"retries": 5
}
]
}
访问接口分别返回如下：
http://192.168.0.181:8000/user/user/getUser?id=1&name=tree&age=12
{
"msg": "ok",
"date": {
"score": 42,
"name": "tree",
"id": 1,
"age": 12,
"nowTime": 1515060166929,
"info": "/checkUser, host:192.168.0.186, service_id:application-1700417004"
},
"code": 200
}
http://192.168.0.181:8000/service/user/getUser?id=1&name=tree&age=12
{
"msg": "ok",
"date": {
"score": 505,
"name": "tree",
"id": 1,
"age": 12,
"nowTime": 1515060402392,
"info": "/checkUser, host:192.168.0.184, service_id:application-1700317003"
},
"code": 200
}
添加Key-Auth插件
开启key-auth插件
POST http://192.168.0.181:8001/apis/spring-boot-consul-service2/plugins
#参数
name:key-auth
{
"created_at": 1515066239000,
"config": {
"key_in_body": false,
"run_on_preflight": true,
"anonymous": "",
"hide_credentials": false,
"key_names": [
"apikey"
]
},
"id": "78c519d3-11f7-4cdf-b038-9f17f1a83427",
"enabled": true,
"api_id": "a99919d1-0770-40a1-81a9-e3c31fd9d282",
"name": "key-auth"
}
然后访问接口提示错误如下错误：
GET http://192.168.0.181:8000/user/user/getUser?id=1&name=tree&age=12
#输出
{
"message": "No API key found in request"
}
删除key-auth插件
DELETE http://192.168.0.181:8001/apis/spring-boot-consul-service2/plugins/78c519d3-11f7-4cdf-b038-9f17f1a83427
查看Api绑定插件
GET http://192.168.0.181:8001/apis/spring-boot-consul-service2/plugins/
# 输出：
{
"total": 0,
"data": []
}
添加限流插件rate-limiting
POST http://192.168.0.181:8001/apis/spring-boot-consul-service2/plugins
#参数
name:rate-limiting
config.second:2
config.minute:10
输出
{
"created_at": 1515068825000,
"config": {
"minute": 10,
"policy": "cluster",
"redis_timeout": 2000,
"hide_client_headers": false,
"second": 2,
"limit_by": "consumer",
"redis_port": 6379,
"redis_database": 0,
"fault_tolerant": true
},
"id": "482c627f-4041-4320-9b2f-0cc7722b92ea",
"name": "rate-limiting",
"api_id": "a99919d1-0770-40a1-81a9-e3c31fd9d282",
"enabled": true
}
访问接口超过限制时会有如下返回：
GET http://192.168.0.181:8000/user/user/getUser?id=1&name=tree&age=12
返回
{
"message": "API rate limit exceeded"
}
但还有些问题，由于消息格式固定，与后端服务的输出格式不统一，需要支持自定义消息格式。
Kong修改异常返回值
比如服务统一消息格式为，如下格式：
{
"code": 200,
"msg": "ok",
"data": {xxx}
}
我们也希望kong的异常返回也能保持如上格式。那么我们可以直接修改kong的源码，其实很简单。
首先下载源码
#下载kong插件源码
git clone [email protected]:Kong/kong.git
找到输出代码进行修改
输出代码位于：kong/kong/tools/responses.lua中，打开进行编辑。
encoded, err = cjson.encode(type(content) == "table" and content or {message = content})
#调整为：
encoded, err = cjson.encode(type(content) == "table" and content or {msg = content, code = status_code})
保存，然后进行编译
[root@tree81 kong]# luarocks make
kong 0.11.2-0 is now installed in /usr/local (license: MIT)
启动，重试
连续快速刷新几次地址：http://192.168.0.181:8000/user/user/getUser?id=1&name=tree&age=12 得到错误信息：
{
"code": 429,
"msg": "API rate limit exceeded"
}
搞定，完美：）