Gateway整合Sentinel

Gateway整合Sentinel比较方便，基本分为一下几步：

1、依赖的引入
2、全局异常处理
3、配置文件修改

1、依赖的引入

<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-alibaba-sentinel-datasource</artifactId>
</dependency>
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-alibaba-sentinel-gateway</artifactId>
</dependency>
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>
<dependency>
    <groupId>com.alibaba.csp</groupId>
    <artifactId>sentinel-datasource-nacos</artifactId>
</dependency>
<dependency>
    <groupId>com.alibaba.csp</groupId>
    <artifactId>sentinel-spring-cloud-gateway-adapter</artifactId>
</dependency>

2、全局异常处理

由于sentinel自带的异常信息不够友好，所以需要自己在代码中进行统一处理，可以根据不同的异常类型，返回不同的提示消息，示例代码如下：

public class SentinelFallbackHandler implements WebExceptionHandler {
    private Mono<Void> writeResponse(ServerWebExchange exchange, String msg) {
        exchange.getResponse().setStatusCode(HttpStatus.INTERNAL_SERVER_ERROR);
        exchange.getResponse().getHeaders().add(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE);
        Map<String, Object> map = new HashMap<>(2);
        map.put("code", -1);
        map.put("msg", msg);
        DataBuffer dataBuffer = exchange.getResponse().bufferFactory().wrap(JSON.toJSONString(map).getBytes());
        return exchange.getResponse().writeWith(Mono.just(dataBuffer));
    }
 
    @Override
    public Mono<Void> handle(ServerWebExchange exchange, Throwable ex) {
        if (exchange.getResponse().isCommitted()) {
            return Mono.error(ex);
        }
        if (!BlockException.isBlockException(ex)) {
            return Mono.error(ex);
        }
        return GatewayCallbackManager.getBlockHandler().handleRequest(exchange, ex).flatMap(response -> writeResponse(exchange, "请求超过最大数量，请稍后重试"));
    }
}

3、配置文件修改

server:
  port: 8080
 
spring:
  application:
    name: gateway
  cloud:
    inetutils:
      #本地机器存在多个ip时，以指定前缀开头的ip注册到服务
      preferred-networks: 192.168.63
    #nacos相关配置
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
        #分组名
        group: 'DEFAULT_GROUP'
        #命名空间的ID
        namespace: 'sentinel'
        username: nacos
        password: nacos
      config:
        server-addr: 127.0.0.1:8848
        #分组名
        group: 'DEFAULT_GROUP'
        #命名空间的ID
        namespace: 'sentinel'
        username: nacos
        password: nacos
        file-extension: yml
    #sentinel相关配置
    sentinel:
      transport:
        dashboard: 127.0.0.1:8089
        eager: true
      datasource:
        #================流控===============
        gw-flow:
          nacos:
            server-addr: 127.0.0.1:8848
            #与sentinel控制台的namespeace统一
            namespace: 6db12247-153b-4d0c-bef6-5c7c5e48faa3
            #nacos中存储规则的dataId,对于dataId使用了${spring.application.name}变量，这样可以根据应用名来区分不同的规则配置
            data-id: ${spring.application.name}-gateway-flow
            #nacos中存储规则的groupId（可以自己定义）
            group-id: SENTINEL_GROUP
            #具体的类型见，org.springframework.cloud.alibaba.sentinel.datasource.RuleType
            rule-type: gw-flow
            #nacos的用户名和密码
            username: nacos
            password: nacos
        #================API管理===============
        gw-api:
          nacos:
            server-addr: 127.0.0.1:8848
            #与sentinel控制台的namespeace统一
            namespace: 6db12247-153b-4d0c-bef6-5c7c5e48faa3
            #nacos中存储规则的dataId,对于dataId使用了${spring.application.name}变量，这样可以根据应用名来区分不同的规则配置
            data-id: ${spring.application.name}-gateway-api
            #nacos中存储规则的groupId（可以自己定义）
            group-id: SENTINEL_GROUP
            #具体的类型见，org.springframework.cloud.alibaba.sentinel.datasource.RuleType,gw-api-group
            rule-type: gw-api-group
            #nacos的用户名和密码
            username: nacos
            password: nacos
        #================流控===============
        degrade:
          nacos:
            server-addr: 127.0.0.1:8848
            namespace: 6db12247-153b-4d0c-bef6-5c7c5e48faa3
            data-id: ${spring.application.name}-degrade-rules
            group-id: SENTINEL_GROUP
            rule-type: degrade
            username: nacos
            password: nacos
        #================系统规则===============
        system:
          nacos:
            server-addr: 127.0.0.1:8848
            namespace: 6db12247-153b-4d0c-bef6-5c7c5e48faa3
            data-id: ${spring.application.name}-system-rules
            group-id: SENTINEL_GROUP
            rule-type: system
            username: nacos
            password: nacos
    gateway:
      discovery:
        locator:
          lower-case-service-id: true
          enabled: true