gateway使用protobuf进行鉴权的坑

1、问题描述

    项目中使用了springcloud alibaba这一套。 其中网关使用的gateway，序列化使用的protobuf。

    使用protobuf作为序列化框架，我们都使用的POST请求，将请求体都放body中。进行鉴权的时候需要获取到body中的内容。

异常信息如下：

2020-09-26 23:38:15.066 [reactor-http-nio-2] INFO [ChainedDynamicProperty.java:115] - Flipping property: allo-roomplay-service.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647
2020-09-26 23:38:15.084 [reactor-http-nio-2] INFO [BaseLoadBalancer.java:197] - Client: allo-roomplay-service instantiated a LoadBalancer: DynamicServerListLoadBalancer:{NFLoadBalancer:name=allo-roomplay-service,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:null
2020-09-26 23:38:15.090 [reactor-http-nio-2] INFO [DynamicServerListLoadBalancer.java:222] - Using serverListUpdater PollingServerListUpdater
2020-09-26 23:38:15.092 [reactor-http-nio-2] INFO [DynamicServerListLoadBalancer.java:150] - DynamicServerListLoadBalancer for client allo-roomplay-service initialized: DynamicServerListLoadBalancer:{NFLoadBalancer:name=allo-roomplay-service,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:com.alibaba.cloud.nacos.ribbon.NacosServerList@51c69eb0
2020-09-26 23:38:15.121 [reactor-http-nio-2] INFO [NacosI18nInitListener.java:26] - +++++++++++++++ Application context init finish
2020-09-26 23:38:15.287 [reactor-http-nio-2] ERROR [Loggers.java:319] - Operator called default onErrorDropped
java.lang.ClassCastException: [B cannot be cast to org.springframework.core.io.buffer.PooledDataBuffer
	at org.springframework.cloud.gateway.filter.RemoveCachedBodyFilter.lambda$filter$0(RemoveCachedBodyFilter.java:37)
	at reactor.core.publisher.FluxDoFinally$DoFinallySubscriber.runFinally(FluxDoFinally.java:156)
	at reactor.core.publisher.FluxDoFinally$DoFinallySubscriber.onError(FluxDoFinally.java:132)
	at com.alibaba.csp.sentinel.adapter.reactor.SentinelReactorSubscriber.hookOnError(SentinelReactorSubscriber.java:153)
	at com.alibaba.csp.sentinel.adapter.reactor.InheritableBaseSubscriber.onError(InheritableBaseSubscriber.java:176)
	at com.alibaba.csp.sentinel.adapter.reactor.SentinelReactorSubscriber.onError(SentinelReactorSubscriber.java:37)
	at reactor.core.publisher.MonoFlatMap$FlatMapMain.secondError(MonoFlatMap.java:185)
	at reactor.core.publisher.MonoFlatMap$FlatMapInner.onError(MonoFlatMap.java:251)
	at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onError(FluxPeekFuseable.java:227)
	at reactor.core.publisher.Operators$MonoSubscriber.onError(Operators.java:1671)
	at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreInner.onError(MonoIgnoreThen.java:235)
	at reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onError(MonoPeekTerminal.java:251)
	at reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onError(MonoPeekTerminal.java:251)
	at reactor.core.publisher.Operators.error(Operators.java:182)
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:48)
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
	at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:55)
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
	at reactor.core.publisher.Mono.subscribe(Mono.java:4105)
	at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:172)
	at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56)
	at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:55)
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
	at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150)
	at reactor.core.publisher.FluxContextStart$ContextStartSubscriber.onNext(FluxContextStart.java:103)
	at reactor.core.publisher.FluxContextStart$ContextStartSubscriber.onNext(FluxContextStart.java:103)
	at reactor.core.publisher.FluxMapFuseable$MapFuseableConditionalSubscriber.onNext(FluxMapFuseable.java:287)
	at reactor.core.publisher.FluxFilterFuseable$FilterFuseableConditionalSubscriber.onNext(FluxFilterFuseable.java:330)
	at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1630)
	at reactor.core.publisher.MonoCollect$CollectSubscriber.onComplete(MonoCollect.java:145)
	at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:136)
	at reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:252)
	at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:136)
	at reactor.netty.channel.FluxReceive.terminateReceiver(FluxReceive.java:419)
	at reactor.netty.channel.FluxReceive.drainReceiver(FluxReceive.java:209)
	at reactor.netty.channel.FluxReceive.onInboundComplete(FluxReceive.java:367)
	at reactor.netty.channel.ChannelOperations.onInboundComplete(ChannelOperations.java:363)
	at reactor.netty.http.server.HttpServerOperations.onInboundNext(HttpServerOperations.java:461)
	at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:89)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
	at reactor.netty.http.server.HttpTrafficHandler.channelRead(HttpTrafficHandler.java:211)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
	at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:438)
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:326)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:300)
	at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:253)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1422)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:931)
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:700)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:635)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:552)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:514)
	at io.netty.util.concurrent.SingleThreadEventExecutor$6.run(SingleThreadEventExecutor.java:1050)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.lang.Thread.run(Thread.java:748)
2020-09-26 23:38:15.289 [reactor-http-nio-2] ERROR [Loggers.java:319] - Operator called default onErrorDropped
reactor.core.Exceptions$Bubbling