serverless-scriptable-plugin

What's the plugins for?

This plugin allows you to write scripts to customize Serverless behavior for Serverless 1.x and upper

It also supports running node.js scripts in any build stage.

Features:

• Run any command or nodejs scripts in any stage of serverless lifecycle
• Add custom commands to serverless, e.g. npx serverless YOUR-COMMAND Example

Quick Start

1. Install

   npm install --save-dev serverless-scriptable-plugin
   

2. Add to Serverless config

   plugins:
     - serverless-scriptable-plugin
   
   custom:
     scriptable:
       # add custom hooks
       hooks:
         before:package:createDeploymentArtifacts: npm run build
   
       # or custom commands
       commands:
         migrate: echo Running migration
   

Upgrade from <=1.1.0

This serverless-scriptable-plugin now supports event hooks and custom commands. Here's an example of upgrade to the latest schema. The previous config schema still works for backward compatibility.

Example that using the previous schema:

plugins:
  - serverless-scriptable-plugin

custom:
  scriptHooks:
    before:package:createDeploymentArtifacts: npm run build

Changed to:

plugins:
  - serverless-scriptable-plugin

custom:
  scriptable:
    hooks:
      before:package:createDeploymentArtifacts: npm run build

Examples

1. Customize package behavior

   The following config is using babel for transcompilation and packaging only the required folders: dist and node_modules without aws-sdk

   plugins:
     - serverless-scriptable-plugin
   
   custom:
     scriptable:
       hooks:
         before:package:createDeploymentArtifacts: npm run build
   
   package:
     exclude:
       - '**/**'
       - '!dist/**'
       - '!node_modules/**'
       - node_modules/aws-sdk/**
   

2. Add a custom command

   plugins:
     - serverless-scriptable-plugin
   
   custom:
     scriptable:
       hooks:
         before:migrate:command: echo before migrating
         after:migrate:command: echo after migrating
       commands:
         migrate: echo Running migration
   

   Then you could run this command by:

   $ npx serverless migrate
   Running command: echo before migrating
   before migrating
   Running command: echo Running migrating
   Running migrating
   Running command: echo after migrating
   after migrating
   

3. Deploy python function

   plugins:
     - serverless-scriptable-plugin
   
   custom:
     scriptable:
         hooks:
           before:package:createDeploymentArtifacts: ./package.sh
   
   # serverless will use the specified package that generated by `./package.sh`
   package:
     artifact: .serverless/package.zip
   

   and package.sh script file to package the zip file (https://docs.aws.amazon.com/lambda/latest/dg/python-package.html)

     PACKAGE_FILE=.serverless/package.zip
     rm -f $PACKAGE_FILE && rm -rf output && mkdir -p output
     pip install -r requirements.txt --target output/libs
     # You can use the following command to install if you are using pipenv
     # pipenv requirements > output/requirements.txt && pip install -r output/requirements.txt --target output/libs
     (cd output/libs && zip -r ../../$PACKAGE_FILE . -x '*__pycache__*')
     (zip -r $PACKAGE_FILE your-src-folder -x '*__pycache__*')
   

   Serverless would then deploy the zip file you built to aws lambda.

4. Run any command as a hook script

   It's possible to run any command as the hook script, e.g. use the following command to zip the required folders

   plugins:
     - serverless-scriptable-plugin
   
   custom:
     scriptable:
       hooks:
         before:package:createDeploymentArtifacts: zip -q -r .serverless/package.zip src node_modules
   
   service: service-name
   package:
     artifact: .serverless/package.zip
   

5. Dynamically change resources

   Create CloudWatch Log subscription filter for all Lambda function Log groups, e.g. subscribe to a Kinesis stream

   plugins:
     - serverless-scriptable-plugin
   
   custom:
     scriptable:
       hooks:
         after:package:compileEvents: build/serverless/add-log-subscriptions.js
   
   provider:
     logSubscriptionDestinationArn: 'arn:aws:logs:ap-southeast-2:{account-id}:destination:'
   

   and in build/serverless/add-log-subscriptions.js file:

   const resources = serverless.service.provider.compiledCloudFormationTemplate.Resources;
   const logSubscriptionDestinationArn = serverless.service.provider.logSubscriptionDestinationArn;
   
   Object.keys(resources)
     .filter(name => resources[name].Type === 'AWS::Logs::LogGroup')
     .forEach(logGroupName => resources[`${logGroupName}Subscription`] = {
         Type: "AWS::Logs::SubscriptionFilter",
         Properties: {
           DestinationArn: logSubscriptionDestinationArn,
           FilterPattern: ".",
           LogGroupName: { "Ref": logGroupName }
         }
       }
     );
   

6. Run multiple commands

   It's possible to run multiple commands for the same serverless event, e.g. Add CloudWatch log subscription and dynamodb auto scaling support

   plugins:
     - serverless-scriptable-plugin
   
   custom:
     scriptable:
       hooks:
         after:package:createDeploymentArtifacts: 
           - build/serverless/add-log-subscriptions.js
           - build/serverless/add-dynamodb-auto-scaling.js
   
   service: service-name
   package:
     artifact: .serverless/package.zip
   

7. Suppress console output

   You could control what to show during running commands, in case there are sensitive info in command or console output.

   custom:
     scriptable:
       showStdoutOutput: false # Default true. true: output stderr to console, false: output nothing
       showStderrOutput: false # Default true. true: output stderr to console, false: output nothing
       showCommands: false # Default true. true: show the command before execute, false: do not show commands
   
       hooks:
         ...
       commands:
         ...
   

Hooks

The serverless lifecycle hooks are different to providers, here's a reference of AWS hooks: https://gist.github.com/HyperBrain/50d38027a8f57778d5b0f135d80ea406#file-lifecycle-cheat-sheet-md

Change Log

• Version 0.8.0 and above

  • Check details at https://github.com/weixu365/serverless-scriptable-plugin/releases

• Version 0.7.1

  • [Feature] Fix vulnerability warning by remove unnecessary dev dependencies

• Version 0.7.0

  • [Feature] Return promise object to let serverless to wait until script is finished

• Version 0.6.0

  • [Feature] Supported execute multiple script/command for the same serverless event

• Version 0.5.0

  • [Feature] Supported serverless variables in script/command
  • [Improvement] Integrated with codeclimate for code analysis and test coverage

• Version 0.4.0

  • [Feature] Supported colored output in script/command
  • [Improvement] Integrated with travis for CI

• Version 0.3.0

  • [Feature] Supported to execute any command for serverless event

• Version 0.2.0

  • [Feature] Supported to execute javascript file for serverless event