目標

• 開啟zuul重試機制
• 配置Ribbon
• 配置hystrix

zuul本身已經(jīng)引入了對Ribbon、hystrix的依賴晒屎，因此無需再次引入

修改配置

# 端口號
server.port=6001

# 服務名
spring.application.name=api

zuul.routes.account.path=/account/**
zuul.routes.account.serviceId=account

zuul.routes.wallet.path=/wallet/**
zuul.routes.wallet.serviceId=wallet

# 開啟重試機制
zuul.retryable=true

# eureka服務注冊中心地址
eureka.client.serviceUrl.defaultZone=http://localhost:5000/eureka/

hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=10000

ribbon.ConnectTimeout=3000
ribbon.ReadTimeout=3000
ribbon.OkToRetryOnAllOperations=true
ribbon.MaxAutoRetries=1
ribbon.MaxAutoRetriesNextServer=1

增加ZuulFallBack類

@Component
public class ZuulFallBack implements FallbackProvider {
    @Override
    public String getRoute() {
        return "*";
    }

    public ClientHttpResponse build(String message) {
        return new ClientHttpResponse() {

            @Override
            public InputStream getBody() throws IOException {
                return new ByteArrayInputStream(message.getBytes("UTF-8"));
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders headers = new HttpHeaders();
                //和body中的內(nèi)容編碼一致，否則容易亂碼
                headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
                return headers;
            }

            /**
             * 網(wǎng)關向api服務請求是失敗了缓升，但是消費者客戶端向網(wǎng)關發(fā)起的請求是OK的鼓鲁，
             * 不應該把api的404,500等問題拋給客戶端
             * 網(wǎng)關和api服務集群對于客戶端來說是黑盒子
             */
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.OK;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.OK.value();
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.OK.getReasonPhrase();
            }

            @Override
            public void close() {

            }

        };
    }

    @Override
    public ClientHttpResponse fallbackResponse() {
        return build("gateway fall back");
    }

    @Override
    public ClientHttpResponse fallbackResponse(Throwable cause) {
        return build(cause.getCause().getMessage());
    }
}

測試

訪問 http://localhost:6001/wallet/getWallet?accessToken=11

image.png

這里有點問題，重試策略沒有生效港谊，直接服務降級了骇吭。。歧寺。