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Soul网关源码阅读番外篇(一) HTTP参数请求错误

时间:2023-05-03 04:00:02

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Soul网关源码阅读番外篇(一) HTTP参数请求错误

Soul网关源码阅读番外篇(一) HTTP参数请求错误

共同作者:石立 萧 *

简介

    在Soul网关2.2.1版本源码阅读中,遇到了HTTP请求加上参数返回404的错误,此篇文章基于此进行探索

Bug复现

相关环境配置

    首先把代码拉下来,然后切换到2.2.1版本,命令大致如下:

# 加速拉取git clone /lw1243925457/soul.git# 切换到2.2.1版本git fetch origin 2.2.1:2.2.1git checkout 2.2.1

    如果之前运行过Soul网关的,需要清理下数据库,这里删除原来的soul数据库,让2.2.1版本自己重新建立一个

# 使用docker启动mysqldocker run --name mysql -p 3306:3306 -e MYSQL_ROOT_PASSWORD=root -d mysql:latest# 重启,需要删除soul数据库,然后让程序自己重建docker restart mysql# 使用命令登录,删除原来的数据库docker exec -ti mysql mysql -u root -p> drop database soul;

Soul——Admin启动

    修改Soul-admin模块下的配置文件:soul-admin --> application-local.yml

    修改mysql用户和密码: root root

    修改链接配置:jdbc:mysql://localhost:3306/soul?useUnicode=true&characterEncoding=utf-8&allowPublicKeyRetrieval=true&&useSSL=false

    启动soul-admin --> SoulAdminBootstrap

    如果出现SelectorTypeEnum相关的错误,请切换到jdk8

启动Soul-Bootstrap

    启动soul-bootstrap --> SoulBootstrapApplication

启动HTTP test

    首先右键soul-test根目录下的pom.xml,选择 add as maven project,导入工程

    可能会出现依赖错误,将其版本替换为2.2.1,大致如下:

<dependency><groupId>org.dromara</groupId><artifactId>soul-spring-boot-starter-client-springmvc</artifactId><version>2.2.1</version></dependency>

    启动soul-test --> soul-test-http --> SoulTestHttpApplication

请求复现

    访问管理界面: http://localhost:9095/ ,查看插件列表 --> divide ,表现正常

    访问问题链接: http://localhost:9195/http/order/findById?id=1 ,可以看到出现了404

{"timestamp": "-01-18T02:18:19.557+0000","path": "/","status": 404,"error": "Not Found","message": null,"requestId": "84752141"}

    直接访问: http://localhost:8187/order/findById?id=11 ,正常的

{"id": "11","name": "hello world findById"}

    OK,到这问题基本复现,下面开始debug

源码Debug

查看日志进行切入

    根据老哥的提示,我们也看到了这个问题请求的相关日志,大致如下

o.d.soul.plugin.base.AbstractSoulPlugin : divide selector success match , selector name :/httpo.d.soul.plugin.base.AbstractSoulPlugin : divide rule success match ,rule name :/http/order/findByIdo.d.s.plugin.httpclient.WebClientPlugin : you request,The resulting urlPath is :http://192.168.101.104:8187?id=1111

    最后一句urlpath非常的诡异,完整路径不对。我们就直接看下这个类: WebClientPlugin

# WebClientPluginpublic Mono<Void> execute(final ServerWebExchange exchange, final SoulPluginChain chain) {final SoulContext soulContext = exchange.getAttribute(Constants.CONTEXT);assert soulContext != null;# 在这里debug看到取出来的路径是: http://192.168.101.104:8187?id=1111String urlPath = exchange.getAttribute(Constants.HTTP_URL);if (StringUtils.isEmpty(urlPath)) {Object error = SoulResultWarp.error(SoulResultEnum.CANNOT_FIND_URL.getCode(), SoulResultEnum.CANNOT_FIND_URL.getMsg(), null);return WebFluxResultUtils.result(exchange, error);}long timeout = (long) Optional.ofNullable(exchange.getAttribute(Constants.HTTP_TIME_OUT)).orElse(3000L);log.info("you request,The resulting urlPath is :{}", urlPath);HttpMethod method = HttpMethod.valueOf(exchange.getRequest().getMethodValue());WebClient.RequestBodySpec requestBodySpec = webClient.method(method).uri(urlPath);return handleRequestBody(requestBodySpec, exchange, timeout, chain);}

    在上面这个类中,可以看到就是单纯取路径,我们需要跟踪这个路径的来源

Divide查看

    在前面几篇分析中,我们知道divide plugin 是进行路由配置,并写入真实路径到exchange中的,我们去 DividePlugin 看看

# DividePluginprotected Mono<Void> doExecute(final ServerWebExchange exchange, final SoulPluginChain chain, final SelectorData selector, final RuleData rule) {final SoulContext soulContext = exchange.getAttribute(Constants.CONTEXT);assert soulContext != null;final DivideRuleHandle ruleHandle = GsonUtils.getInstance().fromJson(rule.getHandle(), DivideRuleHandle.class);final List<DivideUpstream> upstreamList = UpstreamCacheManager.getInstance().findUpstreamListBySelectorId(selector.getId());if (CollectionUtils.isEmpty(upstreamList)) {LOGGER.error("divide upstream configuration error:{}", rule.toString());Object error = SoulResultWarp.error(SoulResultEnum.CANNOT_FIND_URL.getCode(), SoulResultEnum.CANNOT_FIND_URL.getMsg(), null);return WebFluxResultUtils.result(exchange, error);}final String ip = Objects.requireNonNull(exchange.getRequest().getRemoteAddress()).getAddress().getHostAddress();DivideUpstream divideUpstream = LoadBalanceUtils.selector(upstreamList, ruleHandle.getLoadBalance(), ip);if (Objects.isNull(divideUpstream)) {LOGGER.error("divide has no upstream");Object error = SoulResultWarp.error(SoulResultEnum.CANNOT_FIND_URL.getCode(), SoulResultEnum.CANNOT_FIND_URL.getMsg(), null);return WebFluxResultUtils.result(exchange, error);}//设置一下 http url : http://192.168.101.104:8187String domain = buildDomain(divideUpstream);// 在这设置realURL,进去看看这个函数String realURL = buildRealURL(domain, soulContext, exchange);// 放入exchange中exchange.getAttributes().put(Constants.HTTP_URL, realURL);exchange.getAttributes().put(Constants.HTTP_TIME_OUT, ruleHandle.getTimeout());return chain.execute(exchange);}private String buildRealURL(final String domain, final SoulContext soulContext, final ServerWebExchange exchange) {String path = domain;// 在这取url,但通过debug发现,它确实是nullfinal String rewriteURI = (String) exchange.getAttributes().get(Constants.REWRITE_URI);if (StringUtils.isNoneBlank(rewriteURI)) {path = path + rewriteURI;} else {// 然后又进到这进行取,发现也是nullfinal String realUrl = soulContext.getRealUrl();if (StringUtils.isNoneBlank(realUrl)) {path = path + realUrl;}}String query = exchange.getRequest().getURI().getQuery();if (StringUtils.isNoneBlank(query)) {return path + "?" + query;}return path;}

    在上面的分析中,发现取出来的都是null,而且没有看到url的设置之类的操作,divide竟然也是单纯的取值

URL设置探索

    那我们需要继续探索url的是怎么设置进去的,通过上面的分析,目前有两者设置url的方式,如下面两段代码:

final String rewriteURI = (String) exchange.getAttributes().get(Constants.REWRITE_URI);final String realUrl = soulContext.getRealUrl();

exchange.getAttributes().get(Constants.REWRITE_URI) 方式探索

    我们类比响应的设置方式,可以得到第一种URL设置的方式大致如下:

exchange.getAttributes().put(Constants.CLIENT_RESPONSE_RESULT_TYPE, ResultEnum.SUCCESS.getName());// 可以得到放Constants.REWRITE_URI的大致代码如下:exchange.getAttributes().put(Constants.REWRITE_URI

    然后使用全局搜索:ctrl+shift+r ,exchange.getAttributes().put(Constants.REWRITE_URI

# RewritePluginprotected Mono<Void> doExecute(final ServerWebExchange exchange, final SoulPluginChain chain, final SelectorData selector, final RuleData rule) {String handle = rule.getHandle();final RewriteHandle rewriteHandle = GsonUtils.getInstance().fromJson(handle, RewriteHandle.class);if (Objects.isNull(rewriteHandle) || StringUtils.isBlank(rewriteHandle.getRewriteURI())) {log.error("uri rewrite rule can not configuration:{}", handle);return chain.execute(exchange);}exchange.getAttributes().put(Constants.REWRITE_URI, rewriteHandle.getRewriteURI());return chain.execute(exchange);}

    搜索到唯一一处有这个代码的类: RewritePlugin ,然后我们打断点,然后并不能进入这个逻辑,查看控制台,它是关闭的。那就先放着,看第二种设置方式

soulContext.getRealUrl() 的设置探索

    运用类比,我们可以猜测设置的代码应该是: soulContext.setRealUrl

    我们进行搜索,也成功的找到了唯一的一处代码,在类 DefaultSoulContextBuilder 中,大致如下:

# DefaultSoulContextBuilderprivate void setSoulContextByHttp(final SoulContext soulContext, final String path) {String contextPath = "/";String[] splitList = StringUtils.split(path, "/");if (splitList.length != 0) {contextPath = contextPath.concat(splitList[0]);}String realUrl = path.substring(contextPath.length());soulContext.setContextPath(contextPath);soulContext.setModule(contextPath);soulContext.setMethod(realUrl);// 设置urlsoulContext.setRealUrl(realUrl);}

    我们在这个函数上打上断点,然而非常不幸的是,也没有进入。瞬间头上???????,这是怎么肥事啊,都没设置

    不抛弃不放弃,咋继续。看到realURL是从path来的,我们继续往上追求其来源,发现调用的是同一个类的下面这个函数 transform ,再上一层是 build

# DefaultSoulContextBuilderprivate SoulContext transform(final ServerHttpRequest request, final MetaData metaData) {final String appKey = request.getHeaders().getFirst(Constants.APP_KEY);final String sign = request.getHeaders().getFirst(Constants.SIGN);final String timestamp = request.getHeaders().getFirst(Constants.TIMESTAMP);SoulContext soulContext = new SoulContext();String path = request.getURI().getPath();soulContext.setPath(path);if (Objects.nonNull(metaData) && metaData.getEnabled()) {if (RpcTypeEnum.SPRING_CLOUD.getName().equals(metaData.getRpcType())) {setSoulContextByHttp(soulContext, path);soulContext.setRpcType(metaData.getRpcType());} else {setSoulContextByDubbo(soulContext, metaData);}} else {setSoulContextByHttp(soulContext, path);soulContext.setRpcType(RpcTypeEnum.HTTP.getName());}soulContext.setAppKey(appKey);soulContext.setSign(sign);soulContext.setTimestamp(timestamp);soulContext.setStartDateTime(LocalDateTime.now());Optional.ofNullable(request.getMethod()).ifPresent(httpMethod -> soulContext.setHttpMethod(httpMethod.name()));return soulContext;}public SoulContext build(final ServerWebExchange exchange) {final ServerHttpRequest request = exchange.getRequest();String path = request.getURI().getPath();MetaData metaData = MetaDataCache.getInstance().obtain(path);if (Objects.nonNull(metaData) && metaData.getEnabled()) {exchange.getAttributes().put(Constants.META_DATA, metaData);}return transform(request, metaData);}

    在build函数上打上断点,感谢老天,成功进入,通过调用栈发现,竟然是熟悉的 GlobalPlugin 进行调用的

# GlobalPluginpublic Mono<Void> execute(final ServerWebExchange exchange, final SoulPluginChain chain) {final ServerHttpRequest request = exchange.getRequest();final HttpHeaders headers = request.getHeaders();final String upgrade = headers.getFirst("Upgrade");SoulContext soulContext;if (StringUtils.isBlank(upgrade) || !"websocket".equals(upgrade)) {soulContext = builder.build(exchange);} else {final MultiValueMap<String, String> queryParams = request.getQueryParams();soulContext = transformMap(queryParams);}exchange.getAttributes().put(Constants.CONTEXT, soulContext);return chain.execute(exchange);}

    在下面的函数打上端口,逐步debug。在下面注释的地方可以看到:我们的是HTTP请求,但竟然走到Dubbo的逻辑里面去,这非常的不对劲

private SoulContext transform(final ServerHttpRequest request, final MetaData metaData) {// http://127.0.0.1:9195/http/order/findById?id=1111final String appKey = request.getHeaders().getFirst(Constants.APP_KEY);final String sign = request.getHeaders().getFirst(Constants.SIGN);final String timestamp = request.getHeaders().getFirst(Constants.TIMESTAMP);SoulContext soulContext = new SoulContext();String path = request.getURI().getPath();soulContext.setPath(path);// 下面这个就神了,判断直接进到了setSoulContextByDubboif (Objects.nonNull(metaData) && metaData.getEnabled()) {if (RpcTypeEnum.SPRING_CLOUD.getName().equals(metaData.getRpcType())) {setSoulContextByHttp(soulContext, path);soulContext.setRpcType(metaData.getRpcType());} else {// 应该是进到HTTP的,估计就这出错了setSoulContextByDubbo(soulContext, metaData);}} else {setSoulContextByHttp(soulContext, path);soulContext.setRpcType(RpcTypeEnum.HTTP.getName());}soulContext.setAppKey(appKey);soulContext.setSign(sign);soulContext.setTimestamp(timestamp);soulContext.setStartDateTime(LocalDateTime.now());Optional.ofNullable(request.getMethod()).ifPresent(httpMethod -> soulContext.setHttpMethod(httpMethod.name()));return soulContext;}

    我们使用下面的diff工具,看看最新版本的代码和目前版本有什么区别:

Diffinity – 轻量级文件对比比较工具Windows

    通过上图我们可以发现,最新版本中进行了更严谨的判断,并将默认的请求类型设置为了HTTP,这样再新版本代码中,就能走HTTP的处理逻辑

    我们将代码修改一下,将HTTP设置为默认处理,代码大致如下:

private SoulContext transform(final ServerHttpRequest request, final MetaData metaData) {final String appKey = request.getHeaders().getFirst(Constants.APP_KEY);final String sign = request.getHeaders().getFirst(Constants.SIGN);final String timestamp = request.getHeaders().getFirst(Constants.TIMESTAMP);SoulContext soulContext = new SoulContext();String path = request.getURI().getPath();soulContext.setPath(path);if (Objects.nonNull(metaData) && metaData.getEnabled()) {if (RpcTypeEnum.SPRING_CLOUD.getName().equals(metaData.getRpcType())) {setSoulContextByHttp(soulContext, path);soulContext.setRpcType(metaData.getRpcType());} else if (RpcTypeEnum.DUBBO.getName().equals(metaData.getRpcType())) {setSoulContextByDubbo(soulContext, metaData);} else {setSoulContextByHttp(soulContext, path);soulContext.setRpcType(RpcTypeEnum.HTTP.getName());}} else {setSoulContextByHttp(soulContext, path);soulContext.setRpcType(RpcTypeEnum.HTTP.getName());}soulContext.setAppKey(appKey);soulContext.setSign(sign);soulContext.setTimestamp(timestamp);soulContext.setStartDateTime(LocalDateTime.now());Optional.ofNullable(request.getMethod()).ifPresent(httpMethod -> soulContext.setHttpMethod(httpMethod.name()));return soulContext;}

    重启,发送请求: http://127.0.0.1:9195/http/order/findById?id=1111 ,OK,非常感人的成功了

{"id": "1111","name": "hello world findById"}

    到这,我们成功的定位并修复了这个错误(虽然没有啥用,但开心啊)

总结

    本篇文章中对Soul网关2.2.1版本中HTTP请求出现404的错误进行了详细的分析

    通过上面的分析可以看出,在2.2.1中,不是Spring cloud的HTTP请求,都会发生错误,这个bug还是有点厉害的

    还认识到了GlobalPlugin这个插件的重要作用,不仅设置了类型,还设置了真实的后端服务器路径,可以说这个插件很核心。rewrite插件也有设置路径这个功能

    又有了新的认识,更新下我们请求处理图:

Soul网关源码分析文章列表

Github

Soul 源码阅读(一) 概览Soul 源码阅读(二)代码初步运行Soul 源码阅读(三)HTTP请求处理概览Soul 网关源码阅读(四)Dubbo请求概览Soul网关源码阅读(五)请求类型探索Soul 网关源码阅读(六)Sofa请求处理概览

掘金

Soul 网关源码阅读(一) 概览 #掘金文章# /post/6917864624423436296Soul 网关源码阅读(二)代码初步运行 #掘金文章# /post/6917865804121767944Soul 网关源码阅读(三)请求处理概览 #掘金文章# /post/6917866538712334343Soul 网关源码阅读(四)Dubbo请求概览 #掘金文章# /post/6917867369909977102Soul网关源码阅读(五)请求类型探索 #掘金文章# /post/6918575905962983438Soul 网关源码阅读(六)Sofa请求处理概览 #掘金文章# /post/6918736260467015693

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