Open-source powertools as a library

[heitorlessa]

Powertools library is currently being implemented as part of PR https://github.com/aws-samples/aws-serverless-airline-booking/pull/27 - Idea came from the Observability episode.

Idea here is to create a separate repo, and publish to PyPi. Time allowing, we could do one for JS too to keep it consistent though DAZN Powertools already does a great job on that.

Powertools lib when open sourced should provide - MVP sample for Python

• Tracing utility
  • Captures cold start as annotation
  • Support POWERTOOLS_SERVICE_NAME and POWERTOOLS_TRACE_DISABLED env vars
  • Auto disables tracing when running in SAM CLI/Lambda emulators
  • Captures exceptions as metadata
  • Captures Lambda handler and any method
• Structured Logging utility
  • Support POWERTOOLS_SERVICE_NAME, `LOG_LEVEL, and POWERTOOLS_LOGGER_LOG_EVENT
  • Captures Lambda context
  • Captures correlation ID
  • Includes service name and Lambda context across all log statements
• Custom metrics async utility
  • Function to print to stdout pusing a specific format](https://theburningmonk.com/2019/07/introducing-a-better-way-to-record-custom-metrics/)
  • Enum/Type to provide hints on what units are possible
• AWS SDK and common HTTP libraries with good defaults (e.g. keepalive, retries, etc.)
  • More details here: https://aws.amazon.com/premiumsupport/knowledge-center/lambda-function-retry-timeout-sdk/

[heitorlessa]

Done: https://github.com/aws-samples/aws-lambda-powertools/