Lambdr

Lambdr is automated deployment and flow management module to create powerful micro services with AWS Lambda functions. It's still in development and looking for contributors. 🤘

Getting Started

First we need to install cli globally.

npm install lambdr -g

Creating a project

Assume that a lambdr project as a micro service.

lambdr new my-micro-service

This will create a folder named 'my-micro-service' and it includes the following files:

my-micro-service
|-- config
|   |-- aws.json (AWS credentials)
|   |-- env.json (Environment variables for every stage)
|   |-- lambdr.json (Lambder configurations)
|-- functions
|   |-- .... (You lambda functions will be here)
|-- package.json
|-- .gitignore

Creating a function

Let's create a signup function. After you enter the command the cli will ask you the HTTP method for the function and the endpoint.

We can use POST method and /users endpoint for signup function.

lambdr function:create signup

After the command finishes, a js file will be added into functions folder.

Running a function locally

It's really easy to run the function in your local machine by using this command:

lambdr function:run signup

Before running a function you can pass event parameters by changing testEvents function property in config/lambdr.json.

{
  "accountId": "123456789",
  "name": "my-micro-service",
  "functions": {
    "signup": {
      "method": "POST",
      "endpoint": "/users",
      "testEvent": {
        "email": "[email protected]",
        "password": "incredible_password"
      }
    }
  }
}

Create a stage

To deploy your functions you need to create a stage. You can create multiple stages like (development, staging, production).

Assume we want a development stage for now.

lambdr stage:create development

Deploy a function

lambdr function:deploy signup development

We deployed signup function into development stage. After this command you will see an endpoint to test this function.

Using environment variables

Lambdr deploys environment variables for it's own stage. You can set environment variables in config/env.json file. An example env.json:

{
  "default": {
    "APP_NAME": "Example OAuth Micro Service",
    "TEST_STAGE": true
  },
  "local": {
    "DYNAMO_TABLE": "users-local"
  },
  "development": {
    "DYNAMO_TABLE": "users-dev"
  },
  "production": {
    "TEST_STAGE": false
  }
}

Notice that TEST_STAGE will be overridden in production stage.

exports.handler = function(event, context) {
  if (process.env.TEST_STAGE) {
    context.done(null, 'This stage is for testing');
  } else {
    context.done(null, 'This stage is production');
  }
}

Other Commands

List stages

lambdr stage:list

Remove a stage

lambdr stage:remove staging