用于流式响应的Spring sleuth日志记录

我有一个RESTAPI，它接收一个id并输出一个文本文件。它是一个Spring引导项目，具有Spring Sleuth依赖项

所有日志都具有StreamingResponseBody回调中日志的正确跟踪ID execpt

这是我控制器中的代码：

private static Logger logger = LoggerFactory.getLogger(TestController.class);


@RequestMapping(value = "/file", method = RequestMethod.POST)
public ResponseEntity<StreamingResponseBody> file (@RequestParam("id") Long id) {

    logger.info("handling /file");


    StreamingResponseBody out = stream -> {
        streamFile(id, stream);

        logger.info("finished handling /file");
    };

    logger.info("Starting to stream file");

    return ResponseEntity.ok()
            .header("Content-Disposition", "attachment; filename=\"test.txt\"")
            .contentType(MediaType.TEXT_PLAIN)
            .body(out);
}

public void streamFile(Long id, OutputStream out) {
    logger.info("Starting to write to output stream");
    try {
        // Retrieve data from database based on id 
        // and stream it out as it becomes available
        // Using a hardcoded value here just as an example
        String file = "foo"; 
        out.write(file.getBytes());
    } catch (IOException e) {
        logger.error("Failed to write to output stream");
    }
    logger.info("Finished writing to output stream");
}

---

如何在streamFile方法中记录跟踪ID？

我不知道您使用的是哪个版本的Sleuth，因此我将编写伪代码

StreamingResponseBody out = stream -> {
        streamFile(id, stream);

        logger.info("finished handling /file");
    };

可能是

1.3.x

2.0.x

StreamingResponseBody out = stream -> {
        streamFile(id, stream);

        logger.info("finished handling /file");
    };

final Span span = tracer.getCurrentSpan();
StreamingResponseBody out = stream -> {
        Span continuedSpan = tracer.continueSpan(span)
        streamFile(id, stream);

        logger.info("finished handling /file");
        tracer.closeSpan(continuedSpan);
    };

final Span span = tracer.currentSpan();
StreamingResponseBody out = stream -> {
        try (SpanInScope ws = tracer.withSpanInScope(span)) {
           streamFile(id, stream);
           logger.info("finished handling /file");
        } finally {
           span.finish();
        }

};