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NOTE: This repo contains only the documentation for the private BoltsOps Pro repo code. Original file: https://github.com/boltopspro/lambda/blob/master/README.md The docs are publish so they are available for interested customers. For access to the source code, you must be a paying BoltOps Pro subscriber. If are interested, you can contact us at contact@boltops.com or https://www.boltops.com

Lambda Function CloudFormation Blueprint

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This blueprint provisions a Lambda Function and CloudWatch Event Rule. The example does the heavy lifting by providing some good code structure. It can be uses an an example to to be modified and fit your needs.

Usage

  1. Add blueprint to Gemfile
  2. Configure: configs/lambda values
  3. Deploy blueprint

Add

Add the blueprint to your lono project's Gemfile.

gem "lambda", git: "git@github.com:boltopspro/lambda.git"

Configure

Use the lono seed command to generate a starter config params files.

LONO_ENV=development lono seed lambda
LONO_ENV=production  lono seed lambda

The files in config/lambda folder will look something like this:

configs/lambda/
└── variables
    ├── development.rb
    └── production.rb

Configure the configs/lambda/variables files.

Deploy

Use the lono cfn deploy command to deploy.

LONO_ENV=development lono cfn deploy lambda --sure --no-wait
LONO_ENV=production  lono cfn deploy lambda --sure --no-wait

If you are using One AWS Account, use these commands instead: One Account.

Configure Details

Lambda Runtime

The default Lambda Runtime for this blueprint is ruby2.7. You can adjust this with the @lambda_runtime variable.

@lambda_runtime = "ruby2.5"

IMPORTANT: Make sure that the version of ruby you are using matches. Lono uses your ruby version to build the autmoatically build the Lambda Layer. To check your ruby version:

$ ruby -v
ruby 2.5.7p206 (2019-10-01 revision 67816) [x86_64-linux]
$

Make sure to run lono clean also if you are changing ruby versions as the lambda layer could be cached in output.

lono clean

If you change the @lambda_runtime to other languages, you'll need to change the code also: app/files/lambda-function. You will also need to handle building and adding the files for the Lambda Layer.

Ruby Specific Tips

With ruby2.5 when the json is in your Gemfile it confuses ruby and it is unable to require json. Believe this is a bug in ruby2.5 itself. Either remove json from your Gemfile or use the ruby2.7 runtime.

Configure Details

Refer to the lono lambda extension for details on how to configure the Schedule Expression, VPC, X-Ray Tracing, etc.

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