serverless-step-functions-offline

Documentation

• Install
• Setup
• Requirements
• Usage
• Run plugin
• What does plugin support

Install

Using NPM:

npm install serverless-step-functions-offline --save-dev

or Yarn:

yarn add serverless-step-functions-offline --dev

Setup

Add the plugin to your serverless.yml:

# serverless.yml

plugins:
  - serverless-step-functions-offline

To verify that the plugin works, run this in your command line:

sls step-functions-offline

It should rise an error like that:

Serverless plugin "serverless-step-functions-offline" initialization errored: Please add ENV_VARIABLES to section "custom"

Requirements

This plugin works only with serverless-step-functions.

You must have this plugin installed and correctly specified statemachine definition using Amazon States Language.

Example of statemachine definition you can see here.

Usage

After all steps are done, need to add to section custom in serverless.yml the key stepFunctionsOffline with properties stateName: path to lambda function.

For example:

service: ServerlessStepPlugin
frameworkVersion: ">=1.13.0 <2.0.0"
plugins:
   - serverless-step-functions-offline

# ...

custom:
  stepFunctionsOffline:
    FirstLambda: firstLambda/index.handler
    # ...
    # ...
    SecondLambda: myDir/index.main

stepFunctions:
  stateMachines:
    foo:
      definition:
        Comment: "An example of the Amazon States Language using wait states"
        StartAt: FirstLambda
        States:
            FirstLambda:
              Type: Task
              Resource: arn:aws:lambda:eu-west-1:123456789:function:TheFirstLambda
              Next: SecondLambda
            SecondLambda:
              Type: Task
              Resource: arn:aws:lambda:eu-west-1:123456789:function:TheSecondLambda
              End: true

Where:

• FirstLambda is the name of step in state machine
• firstLambda/index.handler is the path to Lambda

Run Plugin

sls step-functions-offline --stateMachine={{name}} --event={{path to event file}}

• name: name of state machine in section state functions. In example above it's foo.
• event: input values for execution in JSON format (optional)

If you want to know where you are (in offline mode or not) you can use env variable STEP_IS_OFFLINE.

By default process.env.STEP_IS_OFFLINE = true.

What does plugin support?

TODOs

• Support context object
• Improve performance
• Fixing bugs
• Add unit tests - to make plugin stable (next step)
• Support fields Retry, Catch
• Support other languages except node.js

If you have any questions, feel free to contact me: vkkis1993@gmail.com

License

MIT