serverless-step-functions-offline

:warning: Version 2.0 with breaking changes see usage :warning:

Documentation

- Install
- Setup
- Requirements
- Usage
- Run plugin
- What does plugin support
- Usage with serverless-wepback

Install

Using NPM:
``bash
npm install serverless-step-functions-offline --save-dev
`
or Yarn:
`bash
yarn add serverless-step-functions-offline --dev
`

Setup

Add the plugin to your serverless.yml:
`yaml

serverless.yml

plugins:
- serverless-step-functions-offline
`

To verify that the plugin works, run this in your command line:
`bash
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: name of lambda function.

For example:

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

...

custom:
stepFunctionsOffline:
FirstLambda: firstLambda #(v2.0)
# ...
# ...
SecondLambda: secondLambda #(v2.0)

functions:
firstLambda:
handler: firstLambda/index.handler
name: TheFirstLambda
secondLambda:
handler: secondLambda/index.handler
name: TheSecondLambda
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:
- StepOne is the name of step in state machine
- firstLambda is the name of function in section functions

Run Plugin


`bash
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?

| States | Support |
| ------ | ------ |
| Task | At this moment plugin does not support fields Retry, Catch, TimeoutSeconds, HeartbeatSeconds |
| Choice | All comparison operators except: And, Not, Or |
| Wait | All following fields: Seconds, SecondsPath, Timestamp, TimestampPath |
| Parallel | Only Branches |
| Pass | Result, ResultPath |
| Fail| Cause, Error|
| Succeed| |

$3

The plugin integrates very well with serverless-webpack.

Add the plugins serverless-webpack to your serverless.yml file and make sure that serverless-webpack
precedes serverless-step-functions-offline as the order is important:
`yaml
plugins:
...
- serverless-webpack
...
- serverless-step-functions-offline
...
``

$3

- [x] Support context object
- [x] Improve performance
- [x] Fixing bugs
- [x] Support Pass, Fail, Succeed
- [x] Integration with serverless-webpack
- [ ] Add unit tests - to make plugin stable (next step)
- [ ] Support fields Retry, Catch
- [ ] Support other languages except node.js