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-service2upstream_url:http://spring-boot-consul-service2.service.dc1.consul:17004methods:GETuris:/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:192.168.0.184:17004weight:15target:192.168.0.185:17004weight:15target:192.168.0.186:17004weight: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-limitingconfig.second:2config.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 git@github.com: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 makekong 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： 得到错误信息：
{ "code": 429, "msg": "API rate limit exceeded"} 搞定，完美：）