INSTA-BACKEND SERVICE

This is backend as a service built to implement instagram like service where one can follow other users, share photos, like photos and comment on photos.

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Approach

Flow 1. Get feed of your connections

• Each user has its own redis list having its 10 recent posts.
• Whenever, a user wants to access his feed he hits api which collects all the posts of his followees from redis and sends a response.

Flow 2. Image Storage

• We use Depot Storage with S3 for storage of images.
• Only the link of the image is stored onto database.

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Deployment

• Currently, this is not deployed.

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API:

• The link for API documentation : https://documenter.getpostman.com/view/4946631/SW132JDJ?version=latest

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Test cases

• Unit Test cases have been added for each module to check the functionality at the grass root level.

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Run on your machine

• Ensure you have installed python3.6 or above and postgres9.x and above.

• Install dependancies.

  pip install -r requirements.txt
  

• Create database in postgres with user and password

• Change the SQLALCHEMY_DATABASE_URI in the config

  postgresql://<username>:<password>@localhost:<post:5432>/<database_name>
  

• Upgrade the database

  python manage.py db upgrade
  

• Export AWS_SECRET_KEY and AWS_ACCESS_KEY as environment variables

  export AWS_ACCESS_KEY=<your-key>
  export AWS_SECRET_KEY=<your-key>
  

• Create bucket in AWS

• Change depot.bucket value in

  'depot.bucket': '<bucket_name>'
  

• Start server

  python manage.py runserver
  

Important commands:

1. To run tests .

   pytest tests -W ignore::DeprecationWarning