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account-parent/functions/account-created-function/.gitignore vendored
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# Logs
logs
*.log
npm-debug.log*
# Runtime data
pids
*.pid
*.seed
# Directory for instrumented libs generated by jscoverage/JSCover
lib-cov
# Coverage directory used by tools like istanbul
coverage
# nyc test coverage
.nyc_output
# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
.grunt
# node-waf configuration
.lock-wscript
# Compiled binary addons (http://nodejs.org/api/addons.html)
build/Release
# Dependency directories
node_modules
jspm_packages
# Optional npm cache directory
.npm
# Optional REPL history
.node_repl_history
deployment.yaml

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account-parent/functions/account-created-function/LICENSE
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account-parent/functions/account-created-function/README.md
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# Account Created Function
Node.js source code and deployment scripts for an _AWS Lambda_ function. This function is referenced in an [_Event Stream Processing Microservices_](https://github.com/kbastani/event-stream-processing-microservices/tree/master) example project as a git sub-module.
The lambda function is triggered from events sourced from the [account-worker](https://github.com/kbastani/event-stream-processing-microservices/tree/master/account-parent) application. The lambda function uses an _Amazon API Gateway_ trigger that is invoked from a _Spring Cloud Stream_ application.
**Function Details**:
This lambda function responds to an [AccountEvent](https://github.com/kbastani/event-stream-processing-microservices/blob/master/account-parent/account-web/src/main/java/demo/event/AccountEvent.java) that applies a state change to an [Account](https://github.com/kbastani/event-stream-processing-microservices/blob/master/account-parent/account-web/src/main/java/demo/account/Account.java) resource.
- **context**: [accounts](https://github.com/kbastani/event-stream-processing-microservices/tree/master/account-parent)
- **function**: account-created
- **source_state**: `ACCOUNT_CREATED`
- **target_state**: `ACCOUNT_PENDING`
- **event_type**: `ACCOUNT_CREATED`
- **event_format**: [application/hal+json](http://stateless.co/hal_specification.html)
**Description**:
This event handler is triggered in response to an _Account_ resource transitioning from an `ACCOUNT_CREATED` status to an `ACCOUNT_PENDING` status. The function should apply the `ACCOUNT_PENDING` status to the _Account_ API resource that is linked within the payload of the supplied _AccountEvent_ resource.
This AWS lambda function is a backing service to the [account-worker](https://github.com/kbastani/event-stream-processing-microservices/tree/master/account-parent/account-worker) application. A service binding should inject the _AWS Lambda_ resource address and credentials into the _account-worker_ container as environment variables.
![Account microservice](http://i.imgur.com/WZTR4lQ.png)
The lambda function uses a Node.js module named [Traverson](https://github.com/basti1302/traverson), which is a REST client implementation for [HATEOAS](https://en.wikipedia.org/wiki/HATEOAS). The reference architecture uses [Spring HATEOAS](http://projects.spring.io/spring-hateoas/) to describe REST API resources with embedded links. The links embedded in each API resource allows the code in the lambda function to be completely stateless.
The lambda function only needs to import the _Traverson_ dependency to interact with API resources managed by the [account-web](https://github.com/kbastani/event-stream-processing-microservices/tree/master/account-parent/account-web) microservice.
```javascript
// Lambda Function Handler (Node.js)
exports.handler = (event, context, callback) => {
// Loads the traverson client module
var traverson = require('traverson');
// Apply the confirm command to the Account resource
traverson
.from(event._links.account.href)
.follow('$._links.self.href',
'$._links.commands.href',
'$._links.confirm.href')
.get(function(error, response) {
// Return the account result
callback(error, response);
});
};
```
## Deployment
A shell script is provided in `./deploy.sh`. This script uses the AWS CLI to create a deployment package using an [AWS CloudFormation Template](https://aws.amazon.com/cloudformation/aws-cloudformation-templates/) defined in `./account-created.yaml`. To deploy the lambda function, you must have the AWS CLI installed and configured to an IAM user with sufficient permissions to execute the script.
The script will create a deployment package for the lambda function and upload it as a zip file to an S3 bucket. The bucket name is an argument to the the deployment script.

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#!/bin/bash
ls ./node_modules &> /dev/null || echo "Installing node_modules..."; npm install --silent &> /dev/null; echo ""
function error_exit {
msg="$1"
if [ -z "$1" ]
then
exit 1
else
echo -e ""
echo -e "\x1B[31m$msg\x1B[0m"
exit 1
fi
}
function print_help {
echo -e "Usage: $ ./deploy.sh bucket_name"
}
if [ "$1" = 'help' ]
then
print_help
exit 1
fi
if [ $# -eq 0 ]
then
echo -e "An Amazon S3 bucket name is required as an argument"
print_help
error_exit "Deployment failed..."
fi
if [ -z "$1" ]
then
echo -e "The supplied S3 bucket name is not valid"
print_help
error_exit "Deployment failed..."
fi
bucket_name="$1"
function package {
# Create a CloudFormation package for this AWS Lambda function
echo -e "Packacking deployment..."
echo ""
aws cloudformation package \
--template-file package.yaml \
--output-template-file deployment.yaml \
--s3-bucket $bucket_name || error_exit "Packaging failed: Could not access the S3 bucket..."
echo ""
deploy
}
function deploy {
# Deploy the CloudFormation package
echo -e "Deploying package from s3://$bucket_name..."
echo ""
aws cloudformation deploy \
--template-file deployment.yaml \
--stack-name account-created || error_exit "Deployment failed..."
# Remove the deployment package
rm ./deployment.yaml
}
package

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account-parent/functions/account-created-function/index.js
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// Lambda Function Handler (Node.js)
exports.handler = (event, context, callback) => {
accountCreated(event, callback);
};
// Link traversals
var links = {
account: '$._links.self.href'
};
// DSL for creating a resource flow
var flow = {
tasks: [],
callback: {},
steps: {
then: function(step) {
flow.tasks.push(step);
return flow.steps;
},
start: function(traversal, callback) {
flow.callback = callback;
flow.next({
traversal: traversal
});
}
},
next: function(context) {
flow.tasks.shift()(context);
}
};
// Handle the account created event
function accountCreated(event, callback) {
// Loads the traverson client module
var traverson = require('traverson');
var JsonHalAdapter = require('traverson-hal');
traverson.registerMediaType(JsonHalAdapter.mediaType, JsonHalAdapter);
// Get the account resource href from event
var accountUrl = event._links.account.href;
// Apply the pending status to the attached account
var traversal = traverson.from(accountUrl)
.json()
.withRequestOptions({
headers: {
"Accept": 'application/hal+json',
"Content-Type": 'application/hal+json'
}
});
// Execute account pending workflow
flow.steps
.then(getAccount)
.then(setPending)
.start(traversal, callback);
}
// Gets the account and sends it to the next step
function getAccount(context) {
console.log("Getting account...");
// Fetch account resource
var fetchResource = function(error, account, traversal) {
if (error) return done(error);
if (account.status != "ACCOUNT_CREATED") {
done("Pending account failed, account state invalid: " +
account.status);
} else {
// Trigger the setPending step
flow.next({
account: account,
traversal: traversal
});
}
};
// Follow the account resource
context.traversal
.follow(links.account)
.getResource(fetchResource);
}
// Sets the account status to pending for the next step
function setPending(context) {
console.log("Updating account...");
var updateAccount = function(error, account, traversal) {
if (error) return done(error);
if (account.status == "ACCOUNT_PENDING") {
// Complete the flow
flow.callback(null, account);
} else {
done("Account update failed: status could not be updated to pending");
}
};
// Set account to pending
context.account.status = "ACCOUNT_PENDING";
// Update the account resource
context.traversal
.continue()
.put(context.account, updateAccount);
}
// Something went wrong, notify the callback handler
function done(error) {
flow.callback(error);
}

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account-parent/functions/account-created-function/package.json
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{
"name": "account-created-function",
"version": "1.0.0",
"description": "Account created AWS Lambda function",
"main": "index.js",
"dependencies": {
"traverson": "^3.2.0",
"traverson-hal": "^4.1.1"
},
"devDependencies": {},
"scripts": {},
"repository": {
"type": "git",
"url": "git+https://github.com/kbastani/account-created-function.git"
},
"author": "kbastani",
"license": "ISC",
"bugs": {
"url": "https://github.com/kbastani/account-created-function/issues"
},
"homepage": "https://github.com/kbastani/account-created-function#readme"
}

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account-parent/functions/account-created-function/package.yaml
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AWSTemplateFormatVersion: '2010-09-09'
Transform: 'AWS::Serverless-2016-10-31'
Description: Account created handler
Resources:
accountCreated:
Type: 'AWS::Serverless::Function'
Properties:
Handler: index.handler
Runtime: nodejs4.3
CodeUri: .
Description: Responds to an account creation event
MemorySize: 128
Timeout: 10
Role: 'arn:aws:iam::194021864310:role/service-role/public'
Events:
Api1:
Type: Api
Properties:
Path: /accountCreated
Method: ANY