SpringCloud--OpenFeign服务调用、超时控制、日志打印

Bertha 。 2021-08-27 14:06 586阅读 0赞

#### cloud-consumer-feign-order80模拟调用模块 ####

依赖：

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <parent>
            <artifactId>cloud2020</artifactId>
            <groupId>pers.zhang.springcloud</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>cloud-consumer-feign-order80</artifactId>
    
        <dependencies>
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            </dependency>
            
            <dependency>
                <groupId>pers.zhang.springcloud</groupId>
                <artifactId>cloud-api-commons</artifactId>
                <version>${project.version}</version>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-actuator</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <scope>runtime</scope>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
        </dependencies>
    
    </project>

配置：application.yml

server:
      port: 80
    
    eureka:
      client:
        register-with-eureka: false
        service-url:
          defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/

接口：

@Component
    @FeignClient(value = "CLOUD-PAYMENT-SERVICE")//指定注册中心的服务名
    public interface PaymentFeignService { 
    
        @GetMapping(value = "/payment/get/{id}")
        public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id);
    
    }

使用@FeignClient指定被调用的服务名:  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70]  
接口方法与提供服务方暴露的接口一致：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 1]

Controller：

@RestController
    @Slf4j
    public class OrderFeignController { 
    
        @Resource
        PaymentFeignService paymentFeignService;
    
        @GetMapping(value = "/consumer/payment/get/{id}")
        public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id) { 
            return paymentFeignService.getPaymentById(id);
        }
    }

启动类：

@SpringBootApplication
    @EnableDiscoveryClient
    @EnableFeignClients//开启Feign
    public class OrderFeignMain80 { 
        public static void main(String[] args) { 
            SpringApplication.run(OrderFeignMain80.class, args);
        }
    }

#### 测试 ####

启动Eureka，启动被调用的微服务，再启动80端口的调用方：  
访问：`localhost/consumer/payment/get/35`  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 2]  
再次查询：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 3]

Feign继承了Ribbon负载均衡，默认使用轮询策略。

#### OpenFeign的超时控制 ####

提供服务方新增方法模拟超时：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 4]  
PaymentFeignService中新增对应接口方法：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 5]  
Controller中增加对应方法：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 6]

在服务提供方本地测试：  
访问：`localhost:8001/payment/feign/timeout`:3秒后返回结果如下：

![在这里插入图片描述][20200317185725976.png]

使用Feign在80端口调用8001端口的服务：  
访问：`localhost/consumer/payment/feign/timeout`  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 7]

因为OpenFeign默认等待时间为1秒，但是服务端处理需要超过1秒，导致Feign客户端不再等待，直接返回报错。

为了避免这种情况，有时候需要设置Feign客户端的超时控制。

修改application.yml

server:
      port: 80
    
    eureka:
      client:
        register-with-eureka: false
        service-url:
          defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/
    
    #设置feign客户端超时时间（OpenFeign集成了ribbon，超时由ribbon控制）
    ribbon:
      #指的是建立连接所用的时间，适用于网络正常的情况下，两端连接所用的时间
      ReadTimeout: 5000
      #指的是建立连接后从服务器读取到可用资源所用的时间
      ConnectTimeout: 5000
    
    logging:
      level:
        # feign日志以什么级别监控哪个接口
        pers.zhang.springcloud.service.PaymentFeignService: debug

重启80服务，再次访问`localhost/consumer/payment/feign/timeout`，3秒后返回信息  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 8]

#### OpenFeign日志打印 ####

Fei提供了日志打印功能，可以通过配置来调整日志级别，从而了解Feign中Http请求的细节。

日志级别：

*  NONE：默认，不显示日志
 *  BASIC：仅记录请求方法，URL、响应状态码及执行时间
 *  HEADERS：除了BASIC中定义的信息之外，还有请求和响应的头信息
 *  FULL：除了HEADERS中定义的信息之外，还有请求和响应的正文及元数据

新增配置类：(指定日志级别)

@Configuration
    public class FeignConfig { 
    
        @Bean
        Logger.Level feignLoggerLevel() { 
            return Logger.Level.FULL;
        }
    }

在application.yml中开启日志，同时指定监控的接口

logging:
      level:
        # feign日志以什么级别监控哪个接口
        pers.zhang.springcloud.service.PaymentFeignService: debug

启动服务，访问`localhost/consumer/payment/get/35`  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 9]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 4]: /images/20210813/f586658d613f4608a763468427bda598.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 5]: /images/20210813/d83c60461a534dbfb5ca271cef047ea1.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 6]: /images/20210813/55f360d80b474d88a3a544335b35b7ed.png
[20200317185725976.png]: /images/20210813/ea5b005ff6584af4ad7987282925c74b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 7]: /images/20210813/5b78a1194bec49f4833d7fe8ee2a1a62.png
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