网关中加入熔断机制
在网关中加入熔断机制
添加依赖项
spring-cloud-gateway项目POM文件加入spring-cloud-starter-netflix-hystrix
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
</dependency>
修改配置文件
修改application.yml配置文件
server:
port: 9000
spring:
cloud:
consul:
host: 127.0.0.1
port: 8500
discovery:
register: true
gateway:
routes:
- id: test_route
uri: lb://service-provider
predicates:
- Path=/service-provider/{segment}
filters:
- SetPath=/{segment}
- name: Hystrix
args:
name: service-provider-fallback
fallbackUri: forward:/service-provider-error
- name: Retry
args:
retries: 3
statuses: BAD_GATEWAY,BAD_REQUEST
default-filters:
- name: Hystrix
args:
name: fallbackcmd
fallbackUri: forward:/default-error
application:
name: PC-ApiGateWay
在默认过滤器中加入熔断机制
default-filters:
- name: Hystrix
args:
name: fallbackcmd
fallbackUri: forward:/default-error
gateway下的default-filters代表默认过滤器,Hystrix是熔断机制的实现,fallbackcmd是HystrixCommand对象的名字(name属性),fallbackUri表示触发熔断机制后的跳转请求url,/default-error是在spring-cloud-gateway项目中实现的错误信息统一处理Controller:
@RestController
public class ErrorHandle {
@RequestMapping("/default-error")
public String DefaultErrorHandle(){
return "这是通用错误处理返回的信息。";
}
}
自定义单条路由的熔断机制处理内容
gateway:
routes:
- id: test_route
uri: lb://service-provider
predicates:
- Path=/service-provider/{segment}
filters:
- SetPath=/{segment}
- name: Hystrix
args:
name: service-provider-fallback
fallbackUri: forward:/service-provider-error
内容和上面介绍相同,同样需要spring-cloud-gateway项目实现service-provider-error处理过程。
@RestController
public class ErrorHandle {
@RequestMapping("/default-error")
public String DefaultErrorHandle(){
return "这是通用错误处理返回的信息。";
}
@RequestMapping("/service-provider-error")
public String ServiceProviderErrorHandle(){
return "这是ServiceProvider服务专属的错误处理信息。";
}
}
自动重试机制
gateway:
routes:
- id: test_route
uri: lb://service-provider
predicates:
- Path=/service-provider/{segment}
filters:
- SetPath=/{segment}
- name: Hystrix
args:
name: service-provider-fallback
fallbackUri: forward:/service-provider-error
- name: Retry
args:
retries: 3
statuses: BAD_GATEWAY,BAD_REQUEST
在gateway的filters下声明name为Retry的过滤器,retries重试次数,statuses返回HTTP状态码为何值时重试(还有methods和series参数),请参考org.springframework.http.HttpStatus、org.springframework.http.HttpMethod和org.springframework.http.HttpStatus.Series。
启动项目测试
启动 Consul服务中心和spring-cloud-provider微服务,最后启动spring-cloud-gateway项目,正常情况下:
关闭spring-cloud-provider微服务进程之后再次刷新页面:
源码
Github仓库:https://github.com/sunweisheng/spring-cloud-example
原文地址:https://www.cnblogs.com/bluersw/p/11610709.html