add cron lambda

README.md

@@ -24,12 +24,20 @@ yo cloudformation:<name>
 
 Generate a CloudFormation template that runs a web application as Docker containers on CoreOS instances. 
 
+### cronjob
+
+Generate a CloudFormation template that deploys a AWS Lambda function that is called according to the schedule expression. 
+
 ## License
 
 Apache-2.0 © [Taimos GmbH](https://www.taimos.de)
 
 ## Changelog
 
+### 0.2.0
+
+* add scheduled Lambda generator
+
 ### 0.1.0
 
 * Initial version with docker subgenerator

generators/cronjob/index.js

@@ -0,0 +1,44 @@
+'use strict';
+var Generator = require('yeoman-generator');
+var chalk = require('chalk');
+var yosay = require('yosay');
+
+module.exports = Generator.extend({
+  prompting: function () {
+    this.log(yosay(
+      'Welcome to the terrific ' + chalk.red('generator-cloudformation') + ' generator for scheduled lambdas!'
+    ));
+
+    var prompts = [{
+      type: 'input',
+      name: 'description',
+      message: 'The description of the lambda?'
+    }, {
+      type: 'input',
+      name: 'expression',
+      message: 'The schedule expression?',
+      default: 'rate(1 day)'
+    }, {
+      type: 'input',
+      name: 'timeout',
+      message: 'The lambda execution timeout in seconds?',
+      default: '30'
+    }];
+
+    return this.prompt(prompts).then(function (props) {
+      this.props = props;
+    }.bind(this));
+  },
+
+  writing: function () {
+    this.fs.copyTpl(
+      this.templatePath('cfn.yaml'),
+      this.destinationPath('cfn.yaml'),
+      this.props
+    );
+  },
+
+  install: function () {
+    //
+  }
+});

generators/cronjob/templates/cfn.yaml

@@ -0,0 +1,61 @@
+AWSTemplateFormatVersion: '2010-09-09'
+Description: '<%= description %>'
+Resources:
+  FunctionRole:
+    Type: 'AWS::IAM::Role'
+    Properties:
+      AssumeRolePolicyDocument:
+        Version: '2012-10-17'
+        Statement:
+          - Effect: Allow
+            Principal:
+              Service:
+                - lambda.amazonaws.com
+            Action: 'sts:AssumeRole'
+      Path: /
+      Policies:
+        - PolicyName: root
+          PolicyDocument:
+            Version: '2012-10-17'
+            Statement:
+              # TODO Insert needed permissions here
+              - Effect: Allow
+                Action:
+                  - 'logs:CreateLogGroup'
+                  - 'logs:CreateLogStream'
+                  - 'logs:PutLogEvents'
+                Resource: 'arn:aws:logs:*:*:*'
+  Function:
+    Type: 'AWS::Lambda::Function'
+    Properties:
+      Handler: index.handler
+      Role: !GetAtt FunctionRole.Arn
+      Code:
+        ZipFile: !Sub |
+            "use strict";
+
+            var AWS = require('aws-sdk');
+
+            exports.handler = function (event, context, callback) {
+              CallSomePromiseHere.then(function () {
+                callback(null, 'Successfully finished');
+              }).catch(function (err) {
+                callback(err);
+              });
+            };
+      Runtime: nodejs4.3
+      Timeout: '<%= timeout %>'
+  CronRule:
+    Type: 'AWS::Events::Rule'
+    Properties:
+      ScheduleExpression: '<%= expression %>'
+      Targets:
+        - Id: LambdaScheduler
+          Arn: !GetAtt Function.Arn
+  InvokeLambdaPermission:
+    Type: 'AWS::Lambda::Permission'
+    Properties:
+      FunctionName: !GetAtt Function.Arn
+      Action: 'lambda:InvokeFunction'
+      Principal: events.amazonaws.com
+      SourceArn: !GetAtt CronRule.Arn

test/cronjob.js

@@ -0,0 +1,18 @@
+'use strict';
+var path = require('path');
+var assert = require('yeoman-assert');
+var helpers = require('yeoman-test');
+
+describe('generator-cloudformation:cronjob', function () {
+  before(function () {
+    return helpers.run(path.join(__dirname, '../generators/cronjob'))
+      .withPrompts({someAnswer: true})
+      .toPromise();
+  });
+
+  it('creates files', function () {
+    assert.file([
+      'cfn.yaml'
+    ]);
+  });
+});