This is Wes Dean's response to the Flexion Code Challenge.
The application provides a web interface that allows the user to submit values per the provided scenarios; the scenarios include columns for "Input Temperature", "Target Units", and "Student Response". The scenarios also provide a column for "Output" which has possible values of, "correct", "incorrect", and "invalid".
Therefore, the application requests the three aforementioned fields and responds with one of the aforementioned responses.
The application was written in Python using the Flask microframework; the application is served by the Flask development webserver.
The repository includes a .travis.yml file that configures the Travis CI service to stand-up a test environment and run the unit tests provided. If the unit tests pass, Travis CI will then build an AMI using Packer and Ansible. If the AMI builds properly, Terraform is used to deploy the application on an EC2 instance.
- GNU Make (v4.1)
- Packer (v1.2.0)
- Terraform (v0.11.8)
- Ansible (v2.6.3)
- Python (tested with 2.7.15rc1)
Unit tests are provided that run the provides scenarios' data and verify that the expected Outputs are returned. The Python 'UnitTest' framework is used to run the tests.
make test
An AMI is built using Packer; this AMI can be used to back / instantiate an AWS EC2 instance. The individual build steps are run by an Ansible playbook. Amazon Linux is used as the base / source AMI.
make ami
Once an AMI is built, it can be deployed using Terraform. The Terraform plan process uses an S3 bucket to store remote state; this bucket needs to exist before running Terraform (it isn't configured to create it).
Terraform will query AWS to find the AMI with the provided name and owned by the provided owner. This AMI will be used to back a single AWS EC2 instance.
A security group is created that allows access to the application via web interface. By default, this is port 80.
make live
To tear-down the application, use 'terraform destroy'
To check out the application running on AWS, go to:
Travis CI is used configured to receive a webhook from Github when a commit is pushed to the repository's origin. This kicks off tasks to test, build, and deploy the application.