网关getway中加入熔断机制(Hystrix)

网关中加入熔断机制(Hystrix)
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。