Requirements

• Node.js v12.22.4
• npm/npx v7.21.1
• Docker v20.10.8
• Cairo 0.6.0

Install Dependencies

npm install

The "crypto" folder from the following git repository has to be manually added in the lib/ folder on the project root

https://github.com/starkware-libs/starkex-resources

Use

Make sure docker is running locally

Generate the artifacts by compiling the contract using staknet-compile:

starknet-compile

npx hardhat starknet-compile 

starknet-deploy

npx hardhat starknet-deploy --starknet-network starknetLocalhost

Test

To test Starknet contracts with Mocha, use the regular Hardhat test task:

npx hardhat test

Deploying and interacting using starknet CLI

Compile

mkdir build

starknet-compile contracts/contract.cairo \
    --output build/contract_compiled.json \
    --abi build/contract_abi.json

This will generate the contract address and transaction hash Export the contract address for easy access. Copy the contract address from the output.

export CONTRACT_ADDRESS=0x0324c875882a9b93f6dc01ef6216bac5efdbf8f00c71e7f4c7e09c884cc1b97f

We can also export network name

export STARKNET_NETWORK=alpha

Add balance to user 1 and user 2

starknet invoke \
    --address $CONTRACT_ADDRESS \
    --abi build/contract_abi.json \
    --function increase_balance  --input $BETTOR_PUBLIC_KEY 1000 \
    --signature $BETTER_SIGN_PART_1 $BETTER_SIGN_PART_2

starknet invoke \
    --address $CONTRACT_ADDRESS \
    --abi build/contract_abi.json \
    --function increase_balance  --input $COUNTER_BETTOR_PUBLIC_KEY 1000 \
    --signature $COUNTER_BETTER_SIGN_PART_1 $COUNTER_BETTER_SIGN_PART_2

View balance of user 1 and user 2

starknet call --address $CONTRACT_ADDRESS \
    --abi build/contract_abi.json \
    --function get_balance --input $BETTOR_PUBLIC_KEY

starknet call --address $CONTRACT_ADDRESS \
    --abi build/contract_abi.json \
    --function get_balance --input $COUNTER_BETTOR_PUBLIC_KEY

Create a bet

starknet invoke \
    --address $CONTRACT_ADDRESS \
    --abi build/contract_abi.json \
    --function createBet \
    --inputs $BETTOR_PUBLIC_KEY $AMOUNT $BET_TEXT
    --signature $BETTER_SIGN_BETAMOUNT_PART_1 $BETTER_SIGN_BETAMOUNT_PART_2

User 2 joins the bet as counterbettor

starknet invoke \
    --address $CONTRACT_ADDRESS \
    --abi build/contract_abi.json \
    --function joinCounterBettor \
    --inputs $COUNTER_BETTOR_PUBLIC_KEY

User 3 joins the bet as judge

starknet invoke \
    --address $CONTRACT_ADDRESS \
    --abi build/contract_abi.json \
    --function joinJudge \
    --inputs $JUDGE_PUBLIC_KEY

Judge (user 3) votes user 1 as winner

starknet invoke \
    --address $CONTRACT_ADDRESS \
    --abi build/contract_abi.json \
    --function voteBettor \
    --inputs $JUDGE_PUBLIC_KEY $BETTOR_PUBLIC_KEY
    --signature $JUDGE_SIGN_PART_1 $JUDGE_SIGN_PART_2

Now, after the transaction is verified, verify the balance of user 1, it should get increased by 2x of the bet amount