jkbiggs / blockchain-explorer

Technical Test: Write a blockchain data processing application

blockchain-explorer

Write a blockchain data processing application

Framework used

Express.js - for creating rest endpoints

Getting started

Clone the repository to your local computer.

git clone https://github.com/jkbiggs/blockchain-explorer.git

Open the terminal and change directory to blockchain-explorer

cd blockchain-explorer

Install the project packages:

npm install

Testing

Run the server:

npm run start

Use a software like Postman (or a simple CURL on the terminal) to send the requests to the base url http://localhost:5000 with one of the below supported endpoints:

GET

Get the account balance for a given token at a given time

• http://localhost:5000/address/{addressId}/token/{tokenId}/balance/{time} --you may use -1 for the time in order to get latest

Get the average transfer amount for a given token

• http://localhost:5000/token/{tokenId}/averageTransferAmount

Get the median transfer amount for a given token

• http://localhost:5000/token/{tokenId}/medianTransferAmount

Get the account with the highest balance of a given token at a given time --you may use -1 for the time in order to get latest

• http://localhost:5000/token/{tokenId}/highestBalance/{time}

Get the account that has the most transfers of a given token at a given time --you may use -1 for the time in order to get latest

• http://localhost:5000/token/{tokenId}/mostTransactions/{time}

 curl http://localhost:5000/address/{addressId}/token/{tokenId}/balance/{time}

NOTES:

• I'm using associative arrays (ish) to store the addresses and tokens in order to speed up retrieval time to 0(1)
• I come from a Java background so this (using a map) made the most sense to me