Skip to main content

A Serverless Application on AWS

 

By Morgan Lucas, From Adrian Cantrill’s More Than Certified / GitHub. Find the Notion Page HERE.

Pictured: Someone who would get use out of the app.

Technologies used: AWS, Lambda, Step Functions, API Gateway, S3, SNS & SES.

What Is This?:

A small app for pets to both you for cuddles that will send an alert to a phone and an email address. Both points of contact must be opted into first.

Stage 1

  • I register 4 objects - Two email addresses (sending messages, receiving messages) and 2 phone numbers (one to receive SMS [text messages], and an origination number.

Stage 2

  • I used CloudFormation (again, our old friend) to create an IAM role that email_reminder_lambda uses to interact with other AWS services. Really beats searching through the policies!
  • In the Lambda console, I create a function that uses Python 3.9 rundown and use the LambdaRole created via CloudFormation. There are multiple entries called some variation of LambdaRole, so look for the one with SES/SNS and CloudWatch roles.
  • The function in question needs the email address added, so it goes from

FROM_EMAIL_ADDRESS = 'REPLACE_ME

To

FROM_EMAIL_ADDRESS = 'morganlucas@runtcpip.com

Stage 3

  • Making and configuring the state machine through a CloudFormation stack yet again. It has the ability to invoke the email lambda function to send emails, logging permissions and SNS sending abilities.

  • The State machine will be written in Amazon States Language, which looks like JSON to me.

  • Here is the workflow and my interpretation; The actual workthrough is in the instructions.



Start: The function exists

Timer I’m not sure of yet

ChoiceState is obvious with 4 choices - Email only SMS only, Both, or neither. When one of the message options are chosen, it moves on to pushing the message and ends. NoChoice ends the function.

  • The ARN created in Step 2 is put into EMAIL_LAMBDA_ARN
  • Logging is enabled for all events
  • The State Machine is created and given an ARN.

Stage 4

  • This creates the API gateway and Lambda function to act as the front end for the application.
  • I make yet another function in the Lambda console using Python 3.9 as the runtime that supports the API Gateway, which is created now, alongside the API Gateway, API, and Method.
  • The API has the Regional Endpoint and is deployed in the current region.
  • For more control over the information, I don’t click Configure as proxy resource
  • Enable API Gateway CORS eases restrictions on things calling our APIs with different DNS names.
  • The resource (petcuddleotron) is given the POST method to work with api_lambda.
  • Lambda Proxy Integration is checked.
  • The API is deployed and I get an invoke URL.

Stage 5

  • Creating an S3 bucket to hold the visuals of the webpage that allows public access.
  • Static hosting is placed upon the bucket , and I note how straightforward it is on AWS. I’m given a bucket website endpoint.
  • The files are uploaded to the Objects portion of the bucket. Note that I had to click and drag the files for the webpage to appear; Uploading the entire folder did not work, nor did using the upload dialog.
  • Testing the app with information; I use my receiving email set up in Step 1 (It’s not this);


My dog is very enthusiastic about chicken.

  • In Step Functions, under the petcuddleotron app and Executions, I can see it running!

It did fail; It doesn’t seem to like my email address, despite it being the confirmed one. Every failure involves my email being involved.

When I hit SMS only, it does succeed, but I don’t receive the message until I put the 1 in front of my phone number; I had forgotten.



And now my dog can bother me for attention (If she knew how to use technology);

 



Labels:

Comments

Post a Comment

Popular posts from this blog

Making KPI Dashboards with PowerBI

 While this is the free tier, I cannot share or collaborate with others, nor can I publish content to other people's workspaces, but they will not stop me from screenshooting and recording these self-taught adventures,so! I'm doing this because I idly searched "Mattel careers" and "Information Technology", and seeing a bulletpoint saying the following: Analytical and reporting skills such as creating dashboards and establishing KPIs such as experience with PowerBI, Cognos, Tableau, and Google Data Lake/AWS is preferred And thought "Well, I've used Tableau, and I've heard about PowerBI,  even if its in-demandness is questionable , so how similar is it? And can I write about it?"  First, PowerBI (PIB) does have a downloadable, local version, but apparently Windows-only. I could download the .exe but I couldn't run it / drag it to applications on my MacBook.  Not a problem, we'll use the online SaaS version, and a dataset found here, ...
Post a Comment
Read more

Connecting IoT Devices to a Registration Server (Packet Tracer, Cisco)

 If you're seeing this post, I'm helping you, and you probably have LI presence: React and share this post to help me in return.   In Packet Tracer, a demo software made by Cisco Systems. It certainly has changed a lot since 2016. It's almost an Olympic feat to even get started with it now, but it does look snazzy. This is for the new CCNA, that integrates, among other things, IoT and Automation, which I've worked on here before. Instructions here . I don't know if this is an aspect of "Let's make sure people are paying attention and not simply following blindly", or an oversight - The instructions indicate a Meraki Server, when a regular one is the working option here. I have to enable the IoT service on this server. Also, we assign the server an IPv4 address from a DHCP pool instead of giving it a static one. For something that handles our IoT business, perhaps that's safer; Getting a new IPv4 address every week or so is a minimal step against an...
Post a Comment
Read more

AWS Infrastructure Composer

 A very brief look. The text says; Drag and drop any CloudFormation resource on a visual canvas Connect and configure enhanced components to automatically build IaC for an application architecture Seamlessly transition between authoring workflows visually with Step Functions Workflow Studio and defining resources with Infrastructure Composer Integrate your browser with your project through “local sync” or use Composer in the AWS Toolkit for Visual Studio Code In 2019 there was a similar tool to build infrastructure that would be converted to code. Nice to know they bought it back. When you enter the Composer, it's a blank space with a background reminiscent to the screen for Cloud Formation. Infrastructure Objects are to the left in a drawer;  I've selected a bucket that I can rename. I went to connect a bucket to a Dynamo DB Table, and it's not available yet. It also lost a bucket somewhere in the ether of the GUI. Ah well. I couldn't find the EC2 instance in the...
Post a Comment
Read more