Part of the core team for the middy middleware engine for Node.js Lambda functions.

lumigo-cli

The lumigo-cli is a collection of helpful commands for working with AWS Lambda and just AWS in general.

Here are a few of the more popular commands:

• analyze-lambda-cold-starts: analyze cold start count and duration for all functions in all regions
• analyze-lambda-cost: estimate Lambda function costs in all regions
• powertune-lambda: find the optimal Lambda memory size for performance, cost, or the best balance of the two
• replay-sqs-dlq: replays messages in a SQS DLQ to another SQS queue/SNS topic/Kinesis stream
• tail-dynamodb: tail events going into a DynamoDB stream
• tail-eventbridge-bus: tail events recorded by an EventBridge bus
• tail-eventbridge-rule: tail events recorded by an EventBridge rule
• tail-kinesis: tail events going into a Kinesis stream
• tail-sns: tail messages published to a SNS topic
• tail-sqs: tail messages published to a SQS queue
• switch-profile: easily switch between different named AWS profiles (configured via aws configure)

dazn-lambda-powertools

dazn-lambda-powertools is a collection of tightly integrated tools, including:

• a correlation-ids package for recording correlation IDs.
• a logger package that supports structured logging and would automatically include the current correlation IDs.
• a collection of middy middlewares for extracting correlation IDs from the invocation event, sample logging, logging timeout errors, stopping infinite recursions and obfuscation.
• a collection of client libraries for HTTP, CloudWatchEvents, EventBridge, SNS, SQS, Kinesis, Step Functions and Lambda, all of which knows how to forward the current correlation IDs on.
• a wrapper which applies and configures the aforementioned middlewares to your handler.

Serverless Application Repository apps

• lambda-janitor: cron job to delete old, unused versions of all Lambda functions in the region to free up storage space.
• auto-subscribe-log-group-to-arn: subscribes new and existing CloudWatch log groups to a Lambda function, Kinesis stream, or Firehose delivery stream by ARN.
• auto-set-log-group-retention: updates the retention policy for new and existing CloudWatch log groups to a specified number of days to reduce CloudWatch Logs cost.
• async-custom-metrics: lets you record custom metrics by writing to stdout (which is recorded in CloudWatch Logs) which is then parsed and forwarded to CloudWatch metrics as custom metrics.
• measure-cold-start: lets you measure the cold start of your function. It’s best to use this SAR through the lumigo-cli‘s measure-lambda-cold-starts command, which manages the deployment of this SAR and keeps it up-to-date.
• propagate-cfn-tags: propagates CloudFormation tags to resources that are not automatically tagged, e.g. CloudWatch log groups.
• autodeploy-layer: automatically deploys a Lambda layer to all new and existing functions in the region. Supports opt-in and opt-out via function tags.
• lambda-invocation-cfn-custom-resource: supports CloudFormation custom resource to invoke a Lambda function during deployment.
• dazn-lambda-powertools: deploys all the packages from DAZN lambda powertools (see above) as one Lambda layer in your account.
• cloudwatch-alarms-macro: deploys a CloudFormation macro that auto-generates CloudWatch Alarms for you based on the resources you have in a CloudFormation template.
• lambda-timeout-metric: automatically create metric filters for Lambda log groups to report function timeouts as a custom metric.

Serverless framework plugins

• serverless-step-functions: lets you define Step Functions state machines in the serverless.yml.
• serverless-apigateway-service-proxy: supports AWS service integrations with API Gateway.
• serverless-plugin-extrinsic-functions: gives you the ability to use additional Fn:: functions such as StartsWith, Substring, etc.
• serverless-lumigo: makes it easy to install the Lumigo tracer to your functions.
• serverless-sns-to-sqs-events: makes it easy to configure SNS to SQS to Lambda as a single event source.

Demo apps

I have published many demo apps with accompanying blog posts to illustrate techniques for building serverless applications, such as:

• lambda-config-demo: demonstrates approaches for managing configs for Lambda functions.
• lambda-protobuf-demo: demonstrates how to build APIs that uses protobuffer with Lambda and API Gateway.
• lambda-saga-pattern: demonstrates how to implement the Saga pattern with Lambda and Step Functions.