Soul网关源码阅读(六)请求类型探索
Soul网关源码阅读(六)请求类型探索
简介
在上几篇文章中分析了请求的处理流程,HTTP和RPC请求处理是互斥的,通过请求类型来判断,这篇文章来探索下请求类型的前世今生
源码分析
通过前面的分析,通过请求类型判断是否进入这个plugin进行执行,大致如下:
public Boolean skip(final ServerWebExchange exchange) {
final SoulContext soulContext = exchange.getAttribute(Constants.CONTEXT);
return !Objects.equals(Objects.requireNonNull(soulContext).getRpcType(), RpcTypeEnum.HTTP.getName());
}
Plugin Skip 函数
我们探索下那些plugin有实现skip函数
DividePlugin,判断是不是HTTP
public Boolean skip(final ServerWebExchange exchange) {
final SoulContext soulContext = exchange.getAttribute(Constants.CONTEXT);
return !Objects.equals(Objects.requireNonNull(soulContext).getRpcType(), RpcTypeEnum.HTTP.getName());
}`
WebClientPlugin,是HTTP或者SPRING_CLOUD
public Boolean skip(final ServerWebExchange exchange) {
final SoulContext soulContext = exchange.getAttribute(Constants.CONTEXT);
assert soulContext != null;
return !Objects.equals(RpcTypeEnum.HTTP.getName(), soulContext.getRpcType())
&& !Objects.equals(RpcTypeEnum.SPRING_CLOUD.getName(), soulContext.getRpcType());
}
WebsocketPlugin,是WEB_SOCKET
public Boolean skip(final ServerWebExchange exchange) {
final SoulContext body = exchange.getAttribute(Constants.CONTEXT);
return !Objects.equals(Objects.requireNonNull(body).getRpcType(), RpcTypeEnum.WEB_SOCKET.getName());
}
AlibabaDubboPlugin,类型是DUBBO
public Boolean skip(final ServerWebExchange exchange) {
final SoulContext soulContext = exchange.getAttribute(Constants.CONTEXT);
assert soulContext != null;
return !Objects.equals(soulContext.getRpcType(), RpcTypeEnum.DUBBO.getName());
}
WebClientResponsePlugin,类型是HTTP或者SPRING_CLOUD
public Boolean skip(final ServerWebExchange exchange) {
final SoulContext soulContext = exchange.getAttribute(Constants.CONTEXT);
assert soulContext != null;
return !Objects.equals(RpcTypeEnum.HTTP.getName(), soulContext.getRpcType())
&& !Objects.equals(RpcTypeEnum.SPRING_CLOUD.getName(), soulContext.getRpcType());
}
DubboResponsePlugin,类型是DUBBO
public Boolean skip(final ServerWebExchange exchange) {
final SoulContext soulContext = exchange.getAttribute(Constants.CONTEXT);
assert soulContext != null;
return !Objects.equals(soulContext.getRpcType(), RpcTypeEnum.DUBBO.getName());
}
两个类型看着有点怪,有时候转不过弯了,需要注意
源码追踪
我们看下取类似相关的代码,大致如下:
final SoulContext soulContext = exchange.getAttribute(Constants.CONTEXT);
soulContext.getRpcType()
看看将响应放到exchange中的代码,可以猜测到把Constants.CONTEXT放到exchange的大致代码:
exchange.getAttributes().put(Constants.CLIENT_RESPONSE_RESULT_TYPE, ResultEnum.SUCCESS.getName());
// 可以得到放Constants.CONTEXT的大致代码如下:
exchange.getAttributes().put(Constants.CONTEXT,
在IDEA中使用ctrl+shift+R,全局搜索,发现在 GlobalPlugin 中有嫌疑代码:
# GlobalPlugin
public 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)) {
// 对SoulContext进行操作
soulContext = builder.build(exchange);
} else {
final MultiValueMap<String, String> queryParams = request.getQueryParams();
// 对SoulContext进行操作
soulContext = transformMap(queryParams);
}
// 更新SoulContext
exchange.getAttributes().put(Constants.CONTEXT, soulContext);
return chain.execute(exchange);
}
有两处嫌疑:build和transformMap,我们在看看build函数具体细节
# DefaultSoulContextBuilder build(exchange)
public SoulContext build(final ServerWebExchange exchange) {
final ServerHttpRequest request = exchange.getRequest();
String path = request.getURI().getPath();
// 根据path得到一些元数据
MetaData metaData = MetaDataCache.getInstance().obtain(path);
if (Objects.nonNull(metaData) && metaData.getEnabled()) {
exchange.getAttributes().put(Constants.META_DATA, metaData);
}
// 再看下去
return transform(request, metaData);
}
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);
// 下面都是判断,而且是基于metaData的判断,猜测是在路由注册的时候就携带了相关的类型信息,而且默认是HTTP
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 if (RpcTypeEnum.SOFA.getName().equals(metaData.getRpcType())) {
setSoulContextBySofa(soulContext, metaData);
} else if (RpcTypeEnum.TARS.getName().equals(metaData.getRpcType())) {
setSoulContextByTars(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;
}
类型是从MetaData中取出来的,我们详细去看看类: MetaDataCache
# MetaDataCache
// 从Map中取出数据
public MetaData obtain(final String path) {
MetaData metaData = META_DATA_MAP.get(path);
if (Objects.isNull(metaData)) {
String key = META_DATA_MAP.keySet().stream().filter(k -> PathMatchUtils.match(k, path)).findFirst().orElse("");
return META_DATA_MAP.get(key);
}
return metaData;
}
// 这个函数是存放数据的,我们在这个函数打上断点,看看调用栈
public void cache(final MetaData data) {
META_DATA_MAP.put(data.getPath(), data);
}
在上面的 cache 函数打上端口,它应该是启动的时候初始化的,我们打上断点以后重启Bootstrap程序,调用栈的相关类和函数如下:
# MetaDataAllSubscriber ,再往上看
public void onSubscribe(final MetaData metaData) {
MetaDataCache.getInstance().cache(metaData);
}
# MetaDataHandler ,再往上看
protected void doRefresh(final List<MetaData> dataList) {
metaDataSubscribers.forEach(MetaDataSubscriber::refresh);
dataList.forEach(metaData -> metaDataSubscribers.forEach(metaDataSubscriber -> metaDataSubscriber.onSubscribe(metaData)));
}
# AbstractDataHandler ,这里看到datalist是从json转过来的,继续往上差
public void handle(final String json, final String eventType) {
List<T> dataList = convert(json);
if (CollectionUtils.isNotEmpty(dataList)) {
DataEventTypeEnum eventTypeEnum = DataEventTypeEnum.acquireByName(eventType);
switch (eventTypeEnum) {
case REFRESH:
case MYSELF:
doRefresh(dataList);
break;
case UPDATE:
case CREATE:
doUpdate(dataList);
break;
case DELETE:
doDelete(dataList);
break;
default:
break;
}
}
}
# WebsocketDataHandler ,到了websocket相关的,继续往上
public void executor(final ConfigGroupEnum type, final String json, final String eventType) {
ENUM_MAP.get(type).handle(json, eventType);
}
# SoulWebsocketClient ,到这就查到来源了,从websocket获取过来的
private void handleResult(final String result) {
WebsocketData websocketData = GsonUtils.getInstance().fromJson(result, WebsocketData.class);
ConfigGroupEnum groupEnum = ConfigGroupEnum.acquireByName(websocketData.getGroupType());
String eventType = websocketData.getEventType();
String json = GsonUtils.getInstance().toJson(websocketData.getData());
websocketDataHandler.executor(groupEnum, json, eventType);
}
public void onMessage(final String result) {
// 最终源头,从websocket获取得到的
handleResult(result);
}
我们查看下 result 是个什么都行,内容大致如下(太长了,删了一些):可以看到每个路径都有配置,并且都是RPCType这个属性,那我们基本就找到了,类型是客户端注册的时候自己传入的!
{
"groupType": "META_DATA",
"eventType": "REFRESH",
"data": [{
"id": "1349889526699433984",
"appName": "sofa",
"path": "/sofa/insert",
"rpcType": "sofa",
"serviceName": "org.dromara.soul.examples.dubbo.api.service.DubboTestService",
"methodName": "insert",
"parameterTypes": "org.dromara.soul.examples.dubbo.api.entity.DubboTest",
"rpcExt": "{\"loadbalance\":\"hash\",\"retries\":3,\"timeout\":-1}",
"enabled": true
}, {
"id": "1350625956049108992",
"appName": "dubbo",
"path": "/dubbo/findAll",
"rpcType": "dubbo",
"serviceName": "org.dromara.soul.examples.dubbo.api.service.DubboTestService",
"methodName": "findAll",
"rpcExt": "{\"group\":\"\",\"version\":\"\",\"loadbalance\":\"random\",\"retries\":2,\"timeout\":10000,\"url\":\"\"}",
"enabled": true
}]
}
看下另外一个transformMap,看看它的请求类型是怎么来的
# GlobalPlugin
private SoulContext transformMap(final MultiValueMap<String, String> queryParams) {
SoulContext soulContext = new SoulContext();
soulContext.setModule(queryParams.getFirst(Constants.MODULE));
soulContext.setMethod(queryParams.getFirst(Constants.METHOD));
soulContext.setRpcType(queryParams.getFirst(Constants.RPC_TYPE));
return soulContext;
}
queryParams是从 request 取得的,那应该不是初始化配置来的了,看看 GlobalPlugin 前面的类有没有对其进行处理了
通过前几篇,我们可以总结得到下面的处理链路经过的类
- HttpServerOperations : 明显的netty的请求接收的地方,请求入口
- TcpServerBind
- HttpServerHandle
- ReactorHttpHandlerAdapter :生成response和request
- ReactiveWebServerApplicationContext
- HttpWebHandlerAdapter :exchange 的生成
- ExceptionHandlingWebHandler
- WebHandlerDecorator
- FilteringWebHandler
- DefaultWebFilterChain
- MetricsWebFilter
- HealthFilter
- FileSizeFilter
- WebSocketParamFilter
- HiddenHttpMethodFilter
- SoulWebHandler :plugins调用链,后面带type的表明是需要去类型处理判断的
- GlobalPlugin
- SignPlugin
- WafPlugin
- RateLimiterPlugin
- HystrixPlugin
- Resilience4JPlugin
- DividePlugin : type
- WebClientPlugin : type
- WebsocketPlugin : type
- BodyParamPlugin
- AlibabaDubblePlugin : type
- MonitorPlugin
- WebClientResponsePlugin : type
- DubboResponsePlugin : type
快捷没有思路,就一个一个看看(SoulWebHandler,也没多少),大概瞄了一眼,没有看到设置相关的代码,就头疼
在回去看看 GlobalPlugin,我们仔细看看判断,发现一个有趣的逻辑:判断为空或者不为websocket,那是不是下面那个就是websocket?
# GlobalPlugin
public 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;
// 它这判断为空获取不为websocket,那是不是下面那个就是websocket?
if (StringUtils.isBlank(upgrade) || !"websocket".equals(upgrade)) {
// 对SoulContext进行操作
soulContext = builder.build(exchange);
} else {
final MultiValueMap<String, String> queryParams = request.getQueryParams();
// 对SoulContext进行操作
soulContext = transformMap(queryParams);
}
// 更新SoulContext
exchange.getAttributes().put(Constants.CONTEXT, soulContext);
return chain.execute(exchange);
}
于是我们找个websocket测试一下,下面websocket的测试攻击和websocket的官方说明文档:
我们在ReactorHttpHandlerAdapter/HttpWebHandlerAdapter/DefaultWebFilterChain 这三个上面打上断点,进行逐步调试
断点来到 filter 的 WebSocketParamFilter ,看到了非常可疑的代码
# WebSocketParamFilter
protected Mono<Boolean> doFilter(final ServerWebExchange exchange, final WebFilterChain chain) {
final ServerHttpRequest request = exchange.getRequest();
final HttpHeaders headers = request.getHeaders();
// 进入debug,查看其值为 websocket
final String upgrade = headers.getFirst("Upgrade");
if (StringUtils.isNoneBlank(upgrade) && RpcTypeEnum.WEB_SOCKET.getName().equals(upgrade)) {
return Mono.just(verify(request.getQueryParams()));
}
return Mono.just(true);
}
// 下面这个判断是直接从请求里面取出来的
private Boolean verify(final MultiValueMap<String, String> queryParams) {
return !StringUtils.isBlank(queryParams.getFirst(Constants.MODULE))
&& !StringUtils.isBlank(queryParams.getFirst(Constants.METHOD))
&& !StringUtils.isBlank(queryParams.getFirst(Constants.RPC_TYPE));
}
通过上面的代码,我们基本可以判断,GlobalPlugin 的 transformMap(queryParams) 基本是 websocket 的,而 websocket 类似是随着客户端的请求传入的
总结
梳理一下本篇文章的研究目标,大致如下图:
我们知道了 GlobalPlugin 的具体作用就是将请求类型放入soulContext,那后面的 plugin 就能拿到数据的请求类型
还知道了网关初始化的时候获取路由时,路由的信息自带请求类型;而Websocket请求比较特殊,它从客户端传入就自带请求类型