Spring Cloud zuul网关配置api-gateway

版权声明：本文为wcuu原创文章。 https://blog.csdn.net/wcuuchina/article/details/85992615

zuul网关，主要功能用于 限流，验证

zuul可以通过加载动态过滤机制，从而实现以下各项功能：

• 验证与安全保障: 识别面向各类资源的验证要求并拒绝那些与要求不符的请求。
• 审查与监控: 在边缘位置追踪有意义数据及统计结果，从而为我们带来准确的生产状态结论。
• 动态路由: 以动态方式根据需要将请求路由至不同后端集群处。
• 压力测试: 逐渐增加指向集群的负载流量，从而计算性能水平。
• 负载分配: 为每一种负载类型分配对应容量，并弃用超出限定值的请求。
• 静态响应处理: 在边缘位置直接建立部分响应，从而避免其流入内部集群。
• 多区域弹性: 跨越AWS区域进行请求路由，旨在实现ELB使用多样化并保证边缘位置与使用者尽可能接近。

除此之外，Netflix公司还利用Zuul的功能通过金丝雀版本实现精确路由与压力测试。

本文中提供 基础验证demo， 限流demo

以下为源代码：

<?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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.wcuu</groupId>
    <artifactId>api-gateway</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>api-gateway</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Finchley.SR1</spring-cloud.version>

        <docker.image.prefix>xdclass</docker.image.prefix>

    </properties>

    <dependencies>


        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>






        <!--配置中心客户端-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-client</artifactId>
        </dependency>


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bus-amqp</artifactId>
        </dependency>


    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <finalName>api-gateway</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>

            <plugin>
                <groupId>com.spotify</groupId>
                <artifactId>dockerfile-maven-plugin</artifactId>
                <version>1.3.6</version>
                <configuration>
                    <repository>${docker.image.prefix}/${project.artifactId}</repository>
                    <buildArgs>
                        <JAR_FILE>target/${project.build.finalName}.jar</JAR_FILE>
                    </buildArgs>
                </configuration>
            </plugin>

        </plugins>
    </build>


</project>

#指定注册中心地址
eureka:
  client:
    serviceUrl:
      # 172.19.186.233 http://192.168.4.172:8762/eureka/
      defaultZone: http://192.168.4.172:8762/eureka/
  instance:
    instance-id: ${spring.cloud.client.ip-address}:${server.port}
    prefer-ip-address: true


#服务的名称
spring:
  application:
    name: api-gateway
  #指定从哪个配置中心读取
  cloud:
    config:
      discovery:
        service-id: CONFIG-SERVER
        enabled: true
      profile: test
      label: dev

package cn.wcuu.apigateway.filter;


import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.apache.commons.lang.StringUtils;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.PRE_TYPE;

/**
 * 登录过滤器
 */
@Component
public class LoginFilter  extends ZuulFilter {

    /**
     * 过滤器类型，前置过滤器
     * @return
     */
    @Override
    public String filterType() {
        return PRE_TYPE;
    }

    /**
     * 过滤器顺序，越小越先执行
     * @return
     */
    @Override
    public int filterOrder() {

        return 4;
    }


    /**
     * 过滤器是否生效
     * @return
     */
    @Override
    public boolean shouldFilter() {

        RequestContext requestContext = RequestContext.getCurrentContext();
        HttpServletRequest  request = requestContext.getRequest();

        //ACL

        if ("/apigateway/order/api/v1/order/save".equalsIgnoreCase(request.getRequestURI())){
            return true;
        }
        return false;
    }

    /**
     * 业务逻辑
     * @return
     * @throws ZuulException
     */
    @Override
    public Object run() throws ZuulException {

        //JWT
        RequestContext requestContext =  RequestContext.getCurrentContext();
        HttpServletRequest  request = requestContext.getRequest();

        //token对象
        String token = request.getHeader("token");

        if(StringUtils.isBlank((token))){
            token  = request.getParameter("token");
        }


        //登录校验 JWT
        if (StringUtils.isBlank(token)) {
                requestContext.setSendZuulResponse(false);
                requestContext.setResponseStatusCode(HttpStatus.UNAUTHORIZED.value());
        }

        return null;
    }



}

package cn.wcuu.apigateway.filter;

import com.google.common.util.concurrent.RateLimiter;
import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.PRE_TYPE;

/**
 * 限流
 */
@Component
public class OrderRateLimiterFilter extends ZuulFilter {


    //每秒产生20个令牌
    private static final RateLimiter RATE_LIMITER = RateLimiter.create(20);

    @Override
    public String filterType() {
        return PRE_TYPE;
    }

    @Override
    public int filterOrder() {
        return -4;
    }



    @Override
    public boolean shouldFilter() {


        RequestContext requestContext = RequestContext.getCurrentContext();
        HttpServletRequest request = requestContext.getRequest();

        //接口限流
        if ("/apigateway/provider/api/v1/list".equalsIgnoreCase(request.getRequestURI())){
            return true;
        }

        return false;
    }

    @Override
    public Object run() throws ZuulException {
        RequestContext requestContext = RequestContext.getCurrentContext();
        if(!RATE_LIMITER.tryAcquire()){
            requestContext.setSendZuulResponse(false);
            requestContext.setResponseStatusCode(HttpStatus.TOO_MANY_REQUESTS.value());
        }
        return null;
    }



}

package cn.wcuu.apigateway;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

@SpringBootApplication
@EnableZuulProxy
public class ApiGatewayApplication {

    public static void main(String[] args) {
        SpringApplication.run(ApiGatewayApplication.class, args);
    }
}