Lottery Smart Contract on NEAR testnet in Rust

Description

This contract implements simple lottery game with a 1 NEAR prize for the first person to guess the winning number.

Contract in src/lib.rs provides methods to 1. Set a winning lottery number 2. Guess the winning lottery number

Setup

Follow the guide provided by NEAR Org (https://www.near-sdk.io/zero-to-hero/basics/set-up-skeleton)

Interact w Contract

1. Login to NEAR CLI

• Rust SDK Book

2. Create a subaccount

near create-account lottery.ryantan.testnet --masterAccount ryantan.testnet

*reminder: substitute the testnet accounts with your own

3. Compile smart contract

./build.sh

4. Deploy smart contract using batch actions

near deploy lottery.ryantan.testnet --wasmFile res/lottery.wasm \
  --initFunction 'new' \
  --initArgs '{"winner": "fe2592b42a727e977f055947385b709cc82b16b9a87f88c6abf3900d65d0cdc3"}'

*reminder: 'winner' is the sha256 hash of the number chosen. The value above is the sha256 hash of 4321

5. Guess the winning number

Wrong guess attempt:

near call lottery.ryantan.testnet guess_number '{"guess": "1234"}' --accountId ryantan.testnet

Correct guesss attempt:

near call lottery.ryantan.testnet guess_number '{"guess": "4321"}' --accountId ryantan.testnet

*reminder: substitute the testnet accounts with your own

Get more info at:

• Rust SDK Book
• Template