unfunco / powerslog

A slog handler that enriches structured logs with key fields captured from an AWS Lambda context.

Powerslog

A slog handler that captures key fields from an AWS Lambda context and produces structured logs with the same fields as the Powertools loggers for Python and TypeScript.

Getting started

Requirements

• Go 1.22+

Installation and usage

package main

import (
    "context"
    "log/slog"
    "net/http"
    "os"

    "github.com/aws/aws-lambda-go/events"
    "github.com/aws/aws-lambda-go/lambda"
    "github.com/unfunco/powerslog"
)

func handler(ctx context.Context, event events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {
    logger := ctx.Value("logger").(*slog.Logger)
    logger.Info("Request received", slog.Any("event", event))

    return events.APIGatewayProxyResponse{
        StatusCode: http.StatusNoContent,
    }, nil
}

func main() {
    jsonHandler := slog.NewJSONHandler(os.Stdout, nil)
    powerslogHandler := powerslog.NewHandler(jsonHandler)
    logger := slog.New(powerslogHandler)

    ctx := context.WithValue(context.Background(), "logger", logger)
    lambda.StartWithOptions(handler, lambda.WithContext(ctx))
}

Development and testing

cd lambda
GOOS=linux GOARCH=arm64 go build -tags lambda.norpc -o bootstrap main.go
sam deploy --guided

License

© 2024 Daniel Morris
Made available under the terms of the MIT License.