Is there a way to debug Tracing?

[juaoose]

I am trying to instrument my typescript lambda functions with powertools, however, I don't get any sort of traces in the x-ray console, nor any errors in the logs that could help me diagnose why there are no traces.

Is there any way to make the tool(s) print more information on why this might be happening?

Stack

const myFN = new NodejsFunction(this, "myFn", {
      entry: join(
        __dirname,
        "..",
        "functions/payment",
        "my-fn",
        "src",
        "index.ts"
      ),
      tracing: Tracing.ACTIVE,
      runtime: Runtime.NODEJS_18_X,
      architecture: Architecture.ARM_64,
      timeout: Duration.seconds(30),
      bundling: {
        minify: true,
        sourceMap: true,
      },
      environment: {
        NODE_OPTIONS: '--enable-source-maps', // see https://docs.aws.amazon.com/lambda/latest/dg/typescript-exceptions.html
        POWERTOOLS_LOG_LEVEL: 'DEBUG',
        POWERTOOLS_TRACE_ENABLED: "true"
      },
    });

Lambda

import { APIGatewayProxyResult, APIGatewayProxyWithLambdaAuthorizerEvent, Context } from "aws-lambda";
import { Tracer, captureLambdaHandler } from '@aws-lambda-powertools/tracer';
import middy from '@middy/core';

const tracer = new Tracer({ serviceName: 'serverlessAirline' });

interface UserContext {
 accountNumber: string;
 sessionId: string;
}

const lambdaHandler = async (
 event: APIGatewayProxyWithLambdaAuthorizerEvent<UserContext>, context: Context
): Promise<APIGatewayProxyResult> => {
 const handlerSegment = tracer.getSegment()?.addNewSubsegment('### handler');
 handlerSegment && tracer.setSegment(handlerSegment); 

 tracer.putAnnotation('successfulBooking', true);
 console.log("hello", "world");
 handlerSegment?.close();
 handlerSegment && tracer.setSegment(handlerSegment?.parent); 
 return {hello: "world"};
}

export const handler = middy(lambdaHandler).use(captureLambdaHandler(tracer));

[am29d]

Hey @juaoose ,

you can attach the logger to the tracer and see debug statements.

import { Tracer } from '@aws-lambda-powertools/tracer';
import { Logger } from '@aws-lambda-powertools/logger';

const tracer = new Tracer();
const logger = new Logger();
tracer.provider.setLogger(logger);

if you set POWERTOOLS_LOG_LEVEL to DEBUG you will see something like this

{
    "cold_start": true,
    "function_arn": "arn:aws:lambda:eu-west-1:xxxx:function:CdkStack-MyFunction3BAA72D1-Dt80v4r2LZZq",
    "function_memory_size": 1024,
    "function_name": "CdkStack-MyFunction3BAA72D1-Dt80v4r2LZZq",
    "function_request_id": "e822c766-ad93-45b0-af22-b6037e145111",
    "level": "DEBUG",
    "message": "UDP message sent: {\"id\":\"67081736cfdf9bd8\",\"name\":\"SSM\",\"start_time\":1707906769.144,\"namespace\":\"aws\",\"aws\":{\"operation\":\"GetParameter\",\"region\":\"eu-west-1\",\"request_id\":\"bd458e30-c09a-407b-a07a-06757d0c8b66\",\"retries\":1},\"http\":{\"response\":{\"status\":200,\"content_length\":199}},\"end_time\":1707906769.283,\"type\":\"subsegment\",\"parent_id\":\"babe751234a5964f\",\"trace_id\":\"1-65cc96d0-50be1d8458043e0405255b12\"}",
    "service": "service_undefined",
    "timestamp": "2024-02-14T10:32:49.289Z",
    "xray_trace_id": "1-65cc96d0-50be1d8458043e0405255b12"
}

However, we have also received a similar request in our discord channel where customer is not seeing traces and our e2e tests can't find traces either. We are looking into it.