Build Monitor Assignment

The goal of this project is to creat a simple server that aggregates website health checks.

See here for initial project setup

First download the project zip from here. Unzip the file and and examine the instructions in the Readme

Requirements

• Use the got library to do a get request against the server health check URI’s embedded in the project. Consider any non 2xx response a failure
• These results should be automatically fetched every 5 minutes (hint: use a lower value during testing)
• Make sure the fetch request timeout is lower than 5 minutes
• Make the health check calls in parallel
• Store the last successful health check time in lastTimeUp
• Ensure the checker is de-registered when the server shuts down
• Add an error field to Server object which contains the status code and response body when the health check fails

Example Error Response:

{
  "data": {
    "servers": [
      {
        "id": 1,
        "name": "Server1",
        "healthCheckUri": "https://api.durf.dev.stackworx.io/health",
        "status": "DOWN",
        "error": {
          "status": 500,
          "body": "An Internal Server Error Occured"
        }
      }
    ]
  }
}

Bonus Requirements (Difficulty in brakets):

Bonus requirements for extra credit. Not listed in any particular order

• Persist the server status and last up time somewhere so that they are not lost between server restarts (5)
• Abstract all the code into a server layer and keep that code separate from the GraphQL code (2)
• Add a filter paramter to the server field so that a user can request results for only specific servers (2)
• Add a filter to only fetch servers with a specific status. E.g. DOWN (2)
• Creat a mutation to disable the checking of a server (10)

Help

Send an email to assignment@stackworx.io if you get stuck

Hints

• Use httpstat to simulate failures
• Graphql Resolvers can be async or return promises
• Use an IDE that understands typescript