Core-Dao-Task

Hacker House Goa Task Submission by Team : RUST.io

UserManagement Solidity Contract

Overview

The UserManagement contract is a basic user management system implemented in Solidity. It allows the contract owner to add, remove, and retrieve user information. This project includes a smart contract and a deployment script to interact with it using Hardhat.

Table of Contents

1. Prerequisites
2. Contract Overview

Prerequisites

• Node.js
• npm (Node Package Manager)
• Hardhat

Contract Overview

The UserManagement contract allows for managing user data on the Ethereum blockchain.

Contract: UserManagement.sol

• Structs:

  • User: Stores user details such as id, name, and age.

• Mappings:

  • users: Maps an address to a User struct.
  • userIds: Maps a user ID to an address.

• Events:

  • UserAdded: Emitted when a new user is added.
  • UserRemoved: Emitted when a user is removed.

• Modifiers:

  • onlyOwner: Ensures only the contract owner can call certain functions.
  • userExists: Checks if a user exists before executing a function.

• Functions:

  • addUser(address userAddress, string memory name, uint256 age): Adds a new user.
  • removeUser(address userAddress): Removes an existing user.
  • getUser(address userAddress): Retrieves user information by address.
  • getUserById(uint256 userId): Retrieves user information by user ID.
  • getOwner(): Returns the contract owner.

Contract Deployment and Interaction

deploy-and-call.js

This script deploys the UserManagement contract and interacts with it by:

1. Deploying the contract.
2. Adding a user.
3. Retrieving and logging user information.
4. Removing the user.
5. Attempting to retrieve the user information again to demonstrate error handling.

License

This project is licensed under the MIT License.

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