首页 > 解决方案 > AWS X-Ray 与 Node.JS Express 和请求

问题描述

所以我正在尝试用我的 express 应用程序实现 X-Ray。我有我的 app.js 文件并在内部引用了一个路由器文件。

我的项目结构:
project/ routes/ index.js app.js

应用程序.js:

var indexRouter = require("./routes/index")
...
app.use("/", indexRouter)
...

index.js:

const AWSXRay = require("aws-xray-sdk")
const request = require("request")

router.post("/xray", async function(req, res, next) {
    let app = req.app
    app.use(AWSXRay.express.openSegment("MyApp"))

    try {
        console.log(AWSXRay.getSegment()) // this succesfully gets segment
        AWSXRay.captureAsyncFunc("send", function(subsegment) {
            request.get("http://www.google.com", { XRaySegment: subsegment }, function() {
                res.json({
                    success: "success"
                })
                subsegment.close()
        })
    } catch (err) {
        next(err)
    }
    app.use(AWSXRay.express.closeSegment())
})

我正在关注自动模式示例:通过 AWS 文档(https://docs.aws.amazon.com/xray-sdk-for-nodejs/latest/reference/index.html)中的异步函数调用捕获,但我我收到一条错误消息:“无法从上下文中获取当前子/段。”


谁能让我知道我做错了什么?

标签: node.jsamazon-web-servicesexpressrequestaws-xray

解决方案


你应该把app.use(AWSXRay.express.openSegment("MyApp"))代码移到app.js上面app.use("/", indexRouter)

然后将app.use(AWSXRay.express.closeSegment())下面的app.use("/", indexRouter).

如果您查看提供的链接中引用的代码,您会注意到openSegmentandcloseSegment在路线之外,而不是在路线内部(因为您目前拥有它们)

链接中的代码供参考:

var app = express();

//...

var AWSXRay = require('aws-xray-sdk');

app.use(AWSXRay.express.openSegment('defaultName'));               //required at the start of your routes

app.get('/', function (req, res) {
  res.render('index');
});

app.use(AWSXRay.express.closeSegment());   //Required at the end of your routes / first in error handling routes

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