VIDEO BACKEND SERVICE

Backend for a video application created using express, node, mongoose and mongodb.

Data model: Link

Learnings

• Video/Image/File Upload Scenario: In real life development we generally tend to keep the media uploaded by the user on our own servers temporarily so that in case connection get lost with third party service file still remanins. The media is then uploaded to the third party service using a thrid job running in background.

• Often we would want to push certain empty folders on to our git but since does not accept empty repositories we create a file .gitkeep within the folder which causes the git to track the given folder. This file could have been any file but the general convention is to use it as .gitkeep.

• while building this project dotenv package does not officially support the ES6 syntax so we need to stick to the commonJs version of doing so. However to maintain consistency in the code es6 technique can be used by enabling an expermental feature in the package.json file

  "scripts": {
      "dev": "nodemon -r dotenv/config --experimental-json-modules ./src/index.js"
  },

• For managing subscriptions we could have simply added a array in our user data model which kept a track of subscribers but accounts can have subscribers in millions whihc would make it very expensive to operate on that data so we created another model where we manange subscriptions

• To count the subscriber of each channel we will cound the number of subscription document with given channel

• To count the number of channel a user has subscribed, count the documents with user as subscriber

• The subscriber model is kind of like a hashmap mapping subscriber and channel vice versa

Points to remember

• There is always a chance that while talking to the database a problem may occur. Hence always use try catch or promises for error handling.
• DATABASE IS ALWAYS IN ANOTHER CONTINENT. Matlab time lagega. Use async and await.
• Remember to always use full import paths with proper file extensions. This could otherwise lead to modules not beign imported properly.

Advice

• When updating files try using separate controllers for file. It ensures the unncessarily text data is not always sent to the user.