Implementing Blockchain and Converting Web App to DApp

Question

I have my web-application which is in Angular2 (Front end) and Rails (Back end-API), now I want to implement Blockchain to this Web application, so needs to make it DApp.

Here while making the DApp, do I need to remove all the Rails Back-end(API) and convert the business logic into the smart-contracts (Ethereum)?

This application is having more than 50 API's, so should I have to write the 50+ smart contract for each API? that means I need to remove the all Rails API code.

Do I need to require to choose the cloud storage platform like Storj, Decent for storing the data?

Please guide.

Please share any On-line material/blogs which can help me into this.

Thanks in Advance.

Answer 1

By my interpretation, let me break down your problem: Your App has a front end, a database, and a bunch of APIs.

Just to make it clear you cannot convert the entire app to a dapp. Some part of it always has to centralized.

Since you have 50 APIs i'm assuming you have a login/logout/signin/signout APIs as well. It wont take long to convert these apis to smart contract.

The real issue would be to handle requests that return users with large data (audio/video). This is where storj or IPFS would come into picture.

So you can start in this order:

1. Create a front-end.

2. Start with small apis, make a smart contracts with 5 or 6 apis like login or signup.

3. Move to bigger APIs.

4. Move store large files to ipfs and save the links in the smart contracts.

hope this helps