备注：
官网：http://spring.io/projects/spring-cloud
总纲：https://cloud.spring.io/spring-cloud-static/Finchley.SR2/single/spring-cloud.html
Java： 1.8 +
MAVEN： 3.5.0 +
Spring Boot：2.0.7.RELEASE
Spring Cloud：Finchley
说明：
RateLimiter ：RateLimiter是Google开源的实现了令牌桶算法的限流工具（速率限制器）。http://ifeve.com/guava-ratelimiter/
Spring Cloud Zuul RateLimiter ：结合了Zuul对RateLimiter进行了封装，通过实现ZuulFilter提供了服务限流功能
| 限流粒度/类型 | 说明 |
|---|---|
| Authenticated User | 针对请求的用户进行限流 |
| Request Origin | 针对请求的Origin进行限流 |
| URL | 针对URL/接口进行限流 |
| Service | 针对服务进行限流，如果没有配置限流类型，则此类型生效 |
本项目地址：https://github.com/wsk1103/my-spring-cloud
服务限流
延用zuul项目
1. 修改pom.xml，加入新的依赖
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<!-- https://mvnrepository.com/artifact/com.marcosbarbero.cloud/spring-cloud-zuul-ratelimit -->
<dependency>
<groupId>com.marcosbarbero.cloud</groupId>
<artifactId>spring-cloud-zuul-ratelimit</artifactId>
<version>2.2.1.RELEASE</version>
</dependency>
//增加redis，配合redis使用
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
2. 修改application.yml
增加了redis配置和rate limit配置
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eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka/
server:
port: 8769
spring:
application:
name: service-zuul
redis:
host: localhost
port: 6379
zuul:
routes:
a:
path: /a/**
serviceId: service-client
b:
path: /b/**
serviceId: service-feign
ratelimit:
key-prefix: wsk
enabled: true
repository: REDIS
behind-proxy: true
default-policy-list: #optional - will apply unless specific policy exists
- limit: 1 #optional - request number limit per refresh interval window
quota: 1 #optional - request time limit per refresh interval window (in seconds)
refresh-interval: 3 #default value (in seconds)
# type: #optional
# - user
# - origin
# - url
policy-list:
a: #需要和服务同名
- limit: 10 #optional - request number limit per refresh interval window
quota: 100 #optional - request time limit per refresh interval window (in seconds)
refresh-interval: 30 #default value (in seconds)
b:
- limit: 1 #optional - request number limit per refresh interval window
quota: 1 #optional - request time limit per refresh interval window (in seconds)
refresh-interval: 3 #default value (in seconds)
# type: #optional
# - user
# - origin
# - url
# type: #optional value for each type
# - user=anonymous
# - origin=somemachine.com
# - url=/api #url prefix
# - role=user
结果实例
参数说明
Property namespace: zuul.ratelimit
| Property name | Values | Default Value | 说明 |
|---|---|---|---|
| enabled | true/false | false | 是否启用限流 |
| behind-proxy | true/false | false | |
| key-prefix | String | ${spring.application.name:rate-limit-application} | 限流key前缀 |
| repository | CONSUL, REDIS, JPA, BUCKET4J_JCACHE, BUCKET4J_HAZELCAST, BUCKET4J_INFINISPAN, BUCKET4J_IGNITE | - | 必填，使用redis即可 |
| default-policy-list | List of Policy | - | 默认策略 |
| policy-list | Map of Lists of Policy | - | 自定义策略 |
| postFilterOrder | int | FilterConstants.SEND_RESPONSE_FILTER_ORDER - 10 | postFilter过滤顺序 |
| preFilterOrder | int | FilterConstants.FORM_BODY_WRAPPER_FILTER_ORDER | preFilter过滤顺序 |
Policy properties:
| Property name | Values | Default Value | 说明 |
|---|---|---|---|
| limit | number of calls | - | 单位时间内请求次数限制 |
| quota | time of calls | - | 单位时间内累计请求时间限制（秒），非必要参数 |
| refresh-interval | seconds | 60 | 单位时间（秒），默认60秒 |
| type | [ORIGIN, USER, URL, ROLE] | [] | 限流方式：ORIGIN, USER, URL（每个Url 在z秒内访问次数不得超过x次且总计访问时间这不得超过y秒） |
