lambda-echo-install

#!/bin/bash -ex
#
# Install AWS Lambda function: lambda-echo 
#

## Setup

    lambda_function_name=lambda-echo
    lambda_description="Echo AWS Lambda event JSON to CloudWatch Logs"
    lambda_handler=lambda-echo.handler
    lambda_memory=128
    lambda_timeout=2

    lambda_function_file=$lambda_function_name.js
    lambda_assume_role_policy_file=$lambda_function_name-assume-role-policy.json
    lambda_execution_policy_file=$lambda_function_name-execution-policy.json

## Create ZIP file

    lambda_zip_dir=$(mktemp -d /tmp/$lambda_function_name.XXXXXX)
    lambda_zip_file=$lambda_zip_dir/$lambda_function_name.zip
    zip -q -r $lambda_zip_file $lambda_function_file

## Create Role and attach policies

    lambda_role_arn=$(aws iam create-role \
     --role-name "$lambda_function_name-role" \
     --assume-role-policy-document "file://$lambda_assume_role_policy_file"\
     --output text \
     --query 'Role.Arn'
    )

    aws iam put-role-policy \
      --role-name "$lambda_function_name-role" \
      --policy-name "$lambda_function_name-policy" \
      --policy-document "file://$lambda_execution_policy_file"

    # Seems to be some timing issue here
    sleep 10

## Create the function and upload the ZIP file

    aws lambda create-function \
     --function-name "$lambda_function_name" \
      --runtime nodejs \
      --memory-size "$lambda_memory" \
      --timeout "$lambda_timeout" \
      --role "$lambda_role_arn" \
      --handler "$lambda_handler" \
      --description "$lambda_description" \
      --zip-file "fileb://$lambda_zip_file"

## Cleanup

    rm -r $lambda_zip_dir

exit 0