post请求在gateway打印日志内存遗漏

java 复制代码

@Component
public class CacheBodyGlobalFilter implements Ordered, GlobalFilter {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        HttpMethod method = exchange.getRequest().getMethod();
        String contentType = exchange.getRequest().getHeaders().getFirst(HttpHeaders.CONTENT_TYPE);
        if (method == HttpMethod.POST || method == HttpMethod.PUT) {
//            if (MediaType.APPLICATION_FORM_URLENCODED_VALUE.equalsIgnoreCase(contentType)
//                    || MediaType.APPLICATION_JSON_VALUE.equalsIgnoreCase(contentType) || MediaType.APPLICATION_JSON_UTF8_VALUE.equalsIgnoreCase(contentType)) {
            if (StrUtil.isNotBlank(contentType) && contentType.startsWith(MediaType.APPLICATION_JSON_VALUE)) {
                return DataBufferUtils.join(exchange.getRequest().getBody())
                        .flatMap(dataBuffer -> {
                            byte[] bytes = new byte[dataBuffer.readableByteCount()];
                            dataBuffer.read(bytes);
                            //解决内存泄露问题
                            DataBufferUtils.release(dataBuffer);
                            ServerHttpRequest mutatedRequest = new ServerHttpRequestDecorator(
                                    exchange.getRequest()) {
                                @Override
                                public Flux<DataBuffer> getBody() {
                                    return Flux.defer(() -> {
                                        DataBuffer buffer = exchange.getResponse().bufferFactory().wrap(bytes);
                                        DataBufferUtils.retain(buffer);
                                        return Mono.just(buffer);
                                    });
                                }
                            };

                            return chain.filter(exchange.mutate().request(mutatedRequest).build());
                        });
            }
        }
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return Ordered.HIGHEST_PRECEDENCE + 100;
    }
}

上述这段代码就是解决内存遗漏，一定写上

复制代码

DataBufferUtils.release(dataBuffer);

如何打印, 在GlobalFilter实现类

java 复制代码

/**
     * 从Flux<DataBuffer>中获取字符串的方法
     *
     * @return 请求体
     */
    private String resolveBodyFromRequest(ServerHttpRequest serverHttpRequest, String path) {
        String contentType = serverHttpRequest.getHeaders().getFirst(HttpHeaders.CONTENT_TYPE);
        log.info("contentType:{};path:{}", contentType, path);
        if (StrUtil.isNotBlank(contentType) && contentType.startsWith(MediaType.APPLICATION_JSON_VALUE)) {
            //获取请求体
            Flux<DataBuffer> body = serverHttpRequest.getBody();
            AtomicReference<String> bodyRef = new AtomicReference<>();
            body.subscribe(buffer -> {
                CharBuffer charBuffer = StandardCharsets.UTF_8.decode(buffer.asByteBuffer());
                DataBufferUtils.release(buffer);
                bodyRef.set(charBuffer.toString());
            });
            return bodyRef.get();
        }
        return null;
    }