TA的每日心情 | 开心 2021-12-13 21:45 |
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签到天数: 15 天 [LV.4]偶尔看看III
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本文针对于测试环境SpringCloud Gateway问题解决。
1.背景介绍
本文遇到的问题都是在测试环境真正遇到的问题,不一定试用于所有人,仅做一次记录,便于遇到同样问题的干掉这些问题。
使用版本:SpringCloud 2.0.0.RELEASE
1.1 Gateway配置
之前系统是由阿里云SLB直接分发到几台生产服务器,但是经过研究,决定在中间加一层网关,也就是阿里云SLB分发流量到Gateway到下游服务。但是又由于种种原因,决定使用Host方式进行拦截处理,以下为部分配置代码: - [code]spring:
- cloud:
- gateway:
- discovery:
- locator:
- enabled: true
- routes:
- - id: test_client
- uri: lb://TEST-CLIENT
- predicates:
- - Host=www.dalaoyang.cn
- order: 1
- filters:
- - DalaoyangAuth
-
复制代码 [/code]
注意,其中部分内容并非真实环境内容,但是场景绝对真实,如:
test_client:routes的ID。
uri:这里使用的Eureka内的application name
Host:需要拦截的域名
filters:域名前缀
1.2 Gateway过滤器
过滤器内容如下,稍后介绍: - [code]
- @Component
- public class DalaoyangAuthFilterFactory extends AbstractGatewayFilterFactory<Object> {
- private static final Logger logger = LoggerFactory.getLogger(DalaoyangAuthFilterFactory.class);
- @Override
- public GatewayFilter apply(Object config) {
- return (exchange, chain) -> {
- ServerHttpRequest host = exchange.getRequest().mutate().headers(httpHeaders -> {
- httpHeaders.remove("gate_way_auth");
- httpHeaders.add("gate_way_auth", "yes");
- }).build();
- //将现在的request 变成 change对象
- ServerWebExchange build = exchange.mutate().request(host).build();
- return chain.filter(build);
- };
- }
- }
复制代码 [/code]
1.3 下游服务拦截器
下游服务拦截器大致内容如下,这段代码是原有的代码,这个功能大概就是加载公共的属性basePath,用于加载静态资源,比如前端的jquery.js,根据域名判断,然后选择是加载为http://127.0.0.1:8080/jquery.js还是https://www.dalaoyang.cn/jquery.js这种: - [code]public class GlobalInterceptorAdapter extends HandlerInterceptorAdapter {
- private static Logger logger = LoggerFactory.getLogger(GlobalInterceptorAdapter.class);
- @Override
- public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws
- Exception {
- String scheme = request.getScheme();
- String serverName = request.getServerName();
- int port = request.getServerPort();
- String path = request.getContextPath();
- String basePath = "";
- if(serverName.indexOf("www.dalaoyang.cn")!=-1){
- basePath = "//" + serverName + path;
- }else {
- basePath = scheme + "://" + serverName + ":" + port + path;
- }
- if (logger.isDebugEnabled()) {
- logger.debug(basePath);
- }
- request.setAttribute("basePath", basePath);
- return true;
- }
- }
复制代码 [/code]
1.4 下游服务用户过滤器
这段代码也是原有的代码,用户Session过滤器,这个完整内容很多,只截取遇到问题的片段,大致内容就是判断用户是否在其他地方登录,如果登录了就弹出的固定的提示页面,内容如下: - [code]String url = null;
- ApplicationConfig applicationConfig0 = getApplicationConfig();
- if(applicationConfig0 != null) {
- String scheme = applicationConfig0.getUrlScheme();
- if(scheme != null) {
- String requestUrl = request.getRequestURL().toString();
- if(requestUrl != null && requestUrl.length() > 8) {
- requestUrl = requestUrl.substring(requestUrl.indexOf(":"),
- requestUrl.indexOf("/", 8));
- url = scheme + requestUrl;
- }
- }
- }
- if(url != null) {
- response.sendRedirect(url + request.getContextPath() + "/session-time-out");
- } else {
- response.sendRedirect(request.getContextPath() + "/session-time-out");
- }
复制代码 [/code]
1.5 跳转流程
跳转如下:
1.域名指向了Gateway地址。
2.在浏览器使用域名访问Gateway,被Gateway转发到下游服务,返回对应响应。
2.问题一 下游服务无法获取域名
在使用上述配置后,使用request.getServerName()方法已经无法获取到域名了,经过测试,获取到的是服务器的ip地址,导致虽然页面可以正常跳转,但是无法获取到正确的域名,导致静态资源加载有问题。
在网上请教了很多人,本想看看是不是什么地方没有设置对,但是后台还是采取大多数人的建议,在header中加入一个域名信息,修改后Gateway过滤器如下: - [code]@Component
- public class DalaoyangAuthFilterFactory extends AbstractGatewayFilterFactory<Object> {
- private static final Logger logger = LoggerFactory.getLogger(DalaoyangAuthFilterFactory.class);
- @Override
- public GatewayFilter apply(Object config) {
- return (exchange, chain) -> {
- ServerHttpRequest host = exchange.getRequest().mutate().headers(httpHeaders -> {
- httpHeaders.remove("gate_way_auth");
- httpHeaders.add("gate_way_auth", "yes");
-
- httpHeaders.add("realServerName",
- exchange.getRequest().getURI().getHost());
- logger.info("headers:" + httpHeaders.toString());
- }).build();
- //将现在的request 变成 change对象
- ServerWebExchange build = exchange.mutate().request(host).build();
- return chain.filter(build);
- };
- }
- }
复制代码 [/code]
很容易看到,就是如下这句话: - [code]httpHeaders.add("realServerName",
- exchange.getRequest().getURI().getHost());
复制代码 [/code]
下游服务过滤修改为: - [code]public class GlobalInterceptorAdapter extends HandlerInterceptorAdapter {
- private static Logger logger = LoggerFactory.getLogger(GlobalInterceptorAdapter.class);
- private final String TEST_SERVERNAME = "www.dalaoyang.cn";
- @Override
- public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws
- Exception {
- String scheme = request.getScheme();
- String serverName = request.getServerName();
- String realServerName = request.getHeader("realServerName");
- int port = request.getServerPort();
- String path = request.getContextPath();
- String basePath = "";
- if((!StringUtils.isBlank(realServerName))){
- if(realServerName.contains(TEST_SERVERNAME)){
- basePath = "//" + realServerName + path;
- }
- }else {
- basePath = scheme + "://" + serverName + ":" + port + path;
- }
- if (logger.isDebugEnabled()) {
- logger.debug(basePath);
- }
- request.setAttribute("basePath", basePath);
- return true;
- }
- }
复制代码 [/code]
其实大致内容就是,使用如下方式获取域名: - [code]String realServerName = request.getHeader("realServerName");
复制代码 [/code]
到此,问题解决了,大部分内容跳转正常。
3.问题二 NPE异常
部分请求,经过路由访问报如下错误。 - [code]2018-06-20 01:26:04.254 ERROR 1 --- [reactor-http-client-epoll-11] .a.w.r.e.DefaultErrorWebExceptionHandler : Failed to handle request [DELETE http://localhost:8080/entity/5b29ad2cb3cb1f00010a1546]
- java.lang.NullPointerException: null
- at java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1011) ~[na:1.8.0_111]
- at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:1006) ~[na:1.8.0_111]
- at org.springframework.cloud.gateway.filter.NettyRoutingFilter.lambda$filter$3(NettyRoutingFilter.java:117) ~[spring-cloud-gateway-core-2.0.0.RELEASE.jar!/:2.0.0.RELEASE]
- at reactor.core.publisher.FluxPeek$PeekSubscriber.onNext(FluxPeek.java:177) ~[reactor-core-3.1.8.RELEASE.jar!/:3.1.8.RELEASE]
- at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:108) ~[reactor-core-3.1.8.RELEASE.jar!/:3.1.8.RELEASE]
- at reactor.core.publisher.FluxRetryPredicate$RetryPredicateSubscriber.onNext(FluxRetryPredicate.java:81) ~[reactor-core-3.1.8.RELEASE.jar!/:3.1.8.RELEASE]
- at reactor.core.publisher.MonoCreate$DefaultMonoSink.success(MonoCreate.java:146) ~[reactor-core-3.1.8.RELEASE.jar!/:3.1.8.RELEASE]
- at reactor.ipc.netty.channel.PooledClientContextHandler.fireContextActive(PooledClientContextHandler.java:85) ~[reactor-netty-0.7.8.RELEASE.jar!/:0.7.8.RELEASE]
- at reactor.ipc.netty.http.client.HttpClientOperations.onInboundNext(HttpClientOperations.java:578) ~[reactor-netty-0.7.8.RELEASE.jar!/:0.7.8.RELEASE]
- at reactor.ipc.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:136) ~[reactor-netty-0.7.8.RELEASE.jar!/:0.7.8.RELEASE]
- at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:438) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:310) ~[netty-codec-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:284) ~[netty-codec-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:253) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) ~[netty-transport-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:808) ~[netty-transport-native-epoll-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:408) ~[netty-transport-native-epoll-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:308) ~[netty-transport-native-epoll-4.1.25.Final.jar!/:4.1.25.Final]
- at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) ~[netty-common-4.1.25.Final.jar!/:4.1.25.Final]
- at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_111]
复制代码 [/code]
遇到问题后,没有很慌,打开了百度查了查(微笑)。百度没让我很失望,基本上没啥答复,然后谷歌了一下,看到了github上的一个issues,大致内容感觉是SpringCloud Gateway 2.0.0.RELEASE版本有些问题,升级一下版本就好了,如图。
Github issues地址:
https://github.com/spring-cloud/spring-cloud-gateway/issues/429
https://github.com/spring-cloud/spring-cloud-gateway/issues/374
说实话,感觉是版本问题,但是又看到了一篇国人的文章,地址是:http://xiaoqiangge.com/aritcle/1545889008833.html,问题大致类似,加了一下博主的微信,请教了一下,大致了解到了,升级了一下版本,问题解决。
感谢小强哥!!!
4.问题三 下游用户过滤器跳转失效
问题是这样的,刚刚介绍了,用户在其他地方登录会自动跳转至一个界面提示给用户,发现问题是无法跳转。
查看gateway日志,大概提示了这样一句话,如下: - [code]Unhandled failure: Connection has been closed, response already set (status=302)
复制代码 [/code]
从内容大致可以看出,重定向有问题,想到了在用户过滤器中最后的重定向,决定在这里下手,修改后内容如下: - [code]String scheme = request.getScheme();
- String serverName = request.getServerName();
- String realServerName = request.getHeader("realServerName");
- int port = request.getServerPort();
- String path = request.getContextPath();
- String basePath = "";
- if((!StringUtils.isEmpty(realServerName))){
- if(realServerName.contains(TEST_SERVERNAME)){
- basePath = "https://" + realServerName + path;
- }else {
- basePath = scheme + "://" + serverName + ":" + port + path;
- }
- response.sendRedirect(basePath + "/session-time-out");
复制代码 [/code]
问题也解决了,目前还在踩坑测试中,如果大家有类似经验可以一起探讨。 |
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