本文建立在spring-cloud-zuul環境搭建的基礎上進行擴充介紹。
介紹
zuul依賴于ribbon-discovery-filter-spring-cloud-starter實作灰階釋出,通過用戶端的發送到zuul上的請求所帶的标志性參數進行路由。
zuul服務
maven依賴
<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>io.jmnarloch</groupId>
<artifactId>ribbon-discovery-filter-spring-cloud-starter</artifactId>
<version>2.1.0</version>
</dependency>
灰階釋出需要的過濾器
import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import io.jmnarloch.spring.cloud.ribbon.support.RibbonFilterContextHolder;
import javax.servlet.http.HttpServletRequest;
import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.PRE_DECORATION_FILTER_ORDER;
import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.PRE_TYPE;
public class GrayFilter extends ZuulFilter {
@Override
public boolean shouldFilter() {
return true;
}
@Override
public Object run() {
HttpServletRequest request = RequestContext.getCurrentContext().getRequest();
String mark = request.getHeader("gray_mark");
if (mark != null && "enable".equals(mark)) {
RibbonFilterContextHolder.getCurrentContext().add("host-mark", "gray");
} else {
RibbonFilterContextHolder.getCurrentContext().add("host-mark", "running");
}
return null;
}
@Override
public String filterType() {
return PRE_TYPE;
}
@Override
public int filterOrder() {
return PRE_DECORATION_FILTER_ORDER - 1;
}
}
服務端
修改注冊中心的配置
eureka:
client:
serviceUrl:
defaultZone: http://127.0.0.1:8000/eureka #注冊中心位址
registry-fetch-interval-seconds: 10 #用戶端拉取服務端的頻率
instance:
metadata-map:
#host-mark: gray #灰階标志
host-mark: running
Http用戶端
Http用戶端發送請求時需要在請求頭中添加gray_mark=gray或running即可選擇灰階版本或者正式版本