AWS Lambda Quick start

This service processes documents sent to S3. It makes use of Amazon Lambda and S3 bucket events. Here is the official walkthrough for configuring S3 and Lambda. The Setup steps below are only a summary for ongoing development. This code and setup is further explained in my blog https://peekandpoke.wordpress.com/2015/02/26/dancing-the-lambada-with-aws-lambda-or-sending-emails-on-s3-events/

Development Setup and Testing

1. Install pip

• Download: curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
• Install: sudo python get-pip.py

2. Use a python virtual environment

• Install: sudo pip install virtualenv
• Create: virtualenv lambda-env
• Activate: source lambda-env/bin/activate

3. Install node using a virtual environment

• Install nodeenv: pip install nodeenv
• Install node: nodeenv -p --node=0.10.32 nenv
• Update npm (installed with node): npm install npm -g

4. Install Amazon AWS cli tools

• Install: pip install awscli
• Configure: aws configure

5. Update Lambda Function

• Clone project: git@github.com:rmauge/aws-lambda-s3-email.git
• Zip directory:

cd aws-lambda-s3-email/ && zip -r ../aws-lambda-s3-email.zip . -x build/ test/ *~ *.git* .gitignore && cd ..

• Submit update:

aws lambda upload-function
    --region us-east-1
    --function-name lambdaSubmissionFunction
    --function-zip aws-lambda-s3-email.zip
    --role arn:aws:iam::99999999:role/lamdba_exec_role
    --mode event
    --handler index.handler
    --runtime nodejs
    --debug
    --timeout 10
    --memory-size 128
  ```
6. Test function manually
*

aws lambda invoke-async --function-name lambdaSubmissionFunction --region us-east-1 --invoke-args aws-lambda-s3-email/test/submissionexample.txt --debug

* When testing the key must exist in the S3 bucket

# AWS Policies and Roles
The Lambda Function requires certain roles/policies to work. These are:
An IAM user to send email (ses-smtp-user)
A role and policy allowing a bucket event to invoke a Lambda Function (lambda_invoke_role)
A role and policy allowing the Lambda Function to access the S3 bucket (lamdba_exec_role)