github.com/software-engr-full-stack/backend-developer-tests

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Answers to stackpath.com's Backend Developer Tests

Original README

Answers

Unit Testing

The answer is just one test file located here.

Web Services

The core answer is in the people.go file inside the rest-api/pkg/handlers sub-directory. But I've thrown a bunch of extras so the answer to this test is pretty much the whole rest-service sub-directory. Extras:

1. Lots of tests for the main handler in the rest-api/pkg/handlers sub-directory.

2. The service is deployed using AWS Lambda. The endpoint is here. cd into rest-service/cmd/microservice/deploy, then run make test to test the different scenarios (GET /people, GET /people/?first_name=...&last_name=...) specified in the test against the endpoint. I used Terraform to provision the AWS resources. The Terraform code is located here.

3. Instrumentation and metrics gathering using Prometheus and Grafana. Some of the metrics gathered are total number of requests and response time. Use the term stackpath_dev_tests in Grafana's Metrics Browser to filter the custom metrics I've added. For now, this only works locally.

Grafana

1. cd into rest-service, then run docker compose up. This command will run the REST service, Prometheus, Grafana, and Node Exporter inside containers. Once the containers are running, proceed to the next steps.

2. Open your browser to http://localhost:3030/. This is the Grafana portal. The default log in username and password is admin.

3. Once you're logged in, click on "Add your first data source", then click on "Prometheus", then enter "http://prometheus:9090" in the HTTP URL text box. Click on "Save & Test" button located below. If everything works, you should see a green check mark "Data source is working" status message.

4. Click on "Explore" on the side bar (compass icon), click on "Metrics Browser", then enter "stackpath_dev_tests" in the "Select a metric" text box. Click on a metric to see information and graphs about that metric.

Input Processing

The answer and the test file.

Concurrency

Here is the answer to the simple pool test.