npm package: @mikeatjulaya/serverless-layers
Description: [![serverless](http://public.serverless.com/badges/v3.svg)](http://www.serverless.com) [![Issues](https://img.shields.io/github/issues/agutoli/serverless-layers.svg)](https://github.com/agutoli/serverless-layers/issues) [![License](https://img.shields.io/
Author: Bruno Agutoli
Latest version: 2.6.3

# serverless-layers
[![serverless](http://public.serverless.com/badges/v3.svg)](http://www.serverless.com)
[![Issues](https://img.shields.io/github/issues/agutoli/serverless-layers.svg)](https://github.com/agutoli/serverless-layers/issues) [![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://www.npmjs.com/package/serverless-layers)
[![NPM](https://img.shields.io/npm/v/serverless-layers.svg)](https://www.npmjs.com/package/serverless-layers)
[![Build Status](https://travis-ci.org/agutoli/serverless-layers.svg?branch=master)](https://travis-ci.org/agutoli/serverless-layers)
[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](#contributing)
![Node.js CI](https://github.com/agutoli/serverless-layers/workflows/Node.js%20CI/badge.svg)
* It attaches automatically layers to the provider and for each function
    * it will skip functions with no other layers as they will use the layer(s) we added to the provider
* It creates a new layer's version when `dependencies` is updated
* If `dependencies` is not changed, it does not publish a new layer
* It reduces drastically lambda size
* It reduces deployment time.
* You can share same layers (libraries) among all lambda functions

# Options 
* [NodeJS](#nodejs)
* [Ruby](#ruby)
* [Python](#python)

## Common requirements
* AWS only (sorry)
* Serverless >= 1.34.0 (layers support)


## Install

`npm install -D serverless-layers`

or

`serverless plugin install --name serverless-layers`

Add the plugin to your `serverless.yml` file:

## Single layer config
Example:

```yaml
plugins:
  - serverless-layers
  
custom:
  serverless-layers:
    functions: # optional
      - my_func2
    dependenciesPath: ./package.json

functions:
  my_func1:
    handler: handler.hello
  my_func2:
    handler: handler.hello
```

## Multiple layers config
Example:

```yaml
plugins:
  - serverless-layers
  
custom:
  serverless-layers:
    # applies for all lambdas 
    - common:
        dependenciesPath: ./my-folder/package.json
    # apply for foo only
    - foo:
        functions:
          - foo
        dependenciesPath: my-folder/package-foo.json
    - staticArn:
        functions:
          - foo
          - bar
        arn: arn:aws:lambda:us-east-1:<your_account>:layer:node-v13-11-0:5

functions:
  foo:
    handler: handler.hello
  bar:
    handler: handler.hello
```

![Screen Shot 2020-04-05 at 2 04 38 pm](https://user-images.githubusercontent.com/298845/78466747-2fb58f80-7748-11ea-948d-4fce40a753bb.png)


|     Option     |    Type   |   Default   | Description |
| -------------- | --------- | ----------- | ----------- |
| compileDir     |  `string` | .serverless | Compilation directory |
| layersDeploymentBucket | `string` |  | You can specify a bucket to upload lambda layers. `Required if deploymentBucket is not defined.` |
| customInstallationCommand | `string` |  | It specify a custom command to install deps ex. `MY_ENV=1 npm --proxy http://myproxy.com i -P` |
| customHash | `string` |  | Can specify custom string, that once changed will force a new build of the layer
| retainVersions | `int` | `null` | Number of layer versions to keep, the rest versions will be removed after deployments |


## NodeJS

### Requirements
* Node >= v6.10.3
* NPM >= 3.10.10
* A valid package.json file

### Options

|     Option     |    Type   |   Default   | Description |
| -------------- | --------- | ----------- | ----------- |
| packageManager |  `string` |    npm      | Possible values: npm, yarn |
| packagePath    |  `string` | package.json | `(DEPRECATED)`: Available for `<= 1.5.0`, for versions `>= 2.x` please use `compatibleRuntimes` |
| dependenciesPath   |  `string` | package.json | Note: `>= 2.x` versions. You can specify custom path for your package.json |
| compatibleRuntimes |  `array` | `['nodejs']` | Possible values: nodejs, nodejs10.x, nodejs12.x |

----------------------

## Ruby

### Requirements
* Ruby >= 2.5
* A valid Gemfile file

### Options

|     Option     |    Type   |   Default   | Description |
| -------------- | --------- | ----------- | ----------- |
| packageManager |  `string` |    bundle      | Possible values: bundle |
| dependenciesPath   |  `string` | Gemfile | Note: Available for `>= 2.x` versions. You can specify custom path for your requirements.txt |
| compatibleRuntimes |  `array` | `['ruby']` | Possible values: ruby2.5, ruby2.7 |

----------------------

## Python

### Requirements
* Python >= 2.7
* A valid requirements.txt file

### Options
|     Option     |    Type   |   Default   | Description |
| -------------- | --------- | ----------- | ----------- |
| packageManager |  `string` |    pip      | Possible values: pip |
| dependenciesPath   |  `string` | requirements.txt | Note: Available for `>= 2.x` versions. You can specify custom path for your requirements.txt |
| compatibleRuntimes |  `array` | `['python']` | Possible values: python2.7, python3.6, python3.7 and python3.8 |

----------------------

## Default Serverless Setup

This plugin will setup follow options automatically if not specified at `serverless.yml`.

|     Option     |    Type   |   Default   |
| -------------- | --------- | ----------- |
| package.individually | `bool` | false    |
| package.exclude | `array` | `['node_modules/**']` |
| package.excludeDevDependencies | `bool` | false |

## Mininal Policy permissions for CI/CD IAM users

`serverless-layers-policy.json`
```json
{
   "Version":"2012-10-17",
   "Statement":[
      {
         "Effect":"Allow",
         "Action":[
            "s3:PutObject",
            "s3:GetObject"
         ],
         "Resource": "arn:aws:s3:::examplebucket"
      },
      {
         "Effect":"Allow",
         "Action":[
            "cloudformation:DescribeStacks"
         ],
         "Resource": "*"
      },
      {
         "Effect":"Allow",
         "Action":[
            "lambda:PublishLayerVersion"
         ],
         "Resource": "*"
      }
   ]
}
```

## License

MIT

## Contributors

Yes, thank you!
This plugin is community-driven, most of its features are from different authors.
Please update the docs and tests and add your name to the package.json file.
We try to follow [Airbnb's JavaScript Style Guide](https://github.com/airbnb/javascript).

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