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LocalStack Demo: Lambda X-Ray with Python Powertools

This X-Ray sample demonstrates how to instrument a Python Lambda function with the AWS Powertools Tracer and shows how to use the X-Ray API to fetch distributed trace data.

Prerequisites

Start LocalStack

Start your LocalStack with your Auth Token configured along with the DEBUG=1 configuration:

LOCALSTACK_AUTH_TOKEN=$LOCALSTACK_AUTH_TOKEN DEBUG=1 localstack start

Deploy

make deploy

The deployment should succeed with the message Successfully created/updated stack - sam-tracer-lambda in us-east-1

Invoke

make invoke

The output will print the Lambda invocation logs

Invoking Lambda Function CaptureLambdaHandlerExample                                                                                                                                       
START RequestId: 747a4f9b-c61c-478c-8929-f1850e975030 Version: $LATEST
END RequestId: 747a4f9b-c61c-478c-8929-f1850e975030
REPORT RequestId: 747a4f9b-c61c-478c-8929-f1850e975030  Duration: 9.87 ms       Billed Duration: 10 ms  Memory Size: 128 MB     Max Memory Used: 128 MB
"dummy payment collected for charge: 123"

Get Trace Summaries

make get-trace-summaries

The response contains a log entry for every request and includes the trace_id.

XRay Event at (2023-09-13T17:14:37.677505) with id (1-6501d1dd-f0f0b7df561e62212e0619b2) and duration (0.000s)
 - 0.000s - ## lambda_handler

Get Traces

make get-traces

The response contains the top-level element Traces with a list of Trace objects for each request. Each Trace contains a collection of segment documents (under Segments), which are double JSON-encoded.

{
    "Traces": [
        {
            "Id": "1-6501d1dd-f0f0b7df561e62212e0619b2",
            "Duration": 0,
            "Segments": [
                {
                    "Id": "0e2a8978a948e3ad",
                    "Document": "{\"id\": \"0e2a8978a948e3ad\", \"name\": \"## lambda_handler\", \"start_time\": 1694618077.6775048, \"parent_id\": \"4559ea33aa4a38b0\", \"in_progress\": false, \"annotations\": {\"ColdStart\": true, \"Service\": \"payment\"}, \"metadata\": {\"payment\": {\"lambda_handler response\": \"dummy payment collected for charge: 123\"}}, \"trace_id\": \"1-6501d1dd-f0f0b7df561e62212e0619b2\", \"type\": \"subsegment\", \"namespace\": \"local\", \"end_time\": 1694618077.6775641}"
                }
            ]
        }
    ],
    "UnprocessedTraceIds": []
}

Credits

This sample is based on the tracer example from powertools-lambda-python.

License

MIT No Attribution