Faucet Smart Contract Documentation

Overview

The Faucet smart contract is designed to distribute tokens to users upon request. It provides a mechanism for distributing tokens to specific addresses and tracking the last time tokens were distributed to an address or a specific fid. This documentation outlines the functionality, usage, and testing of the Faucet contract.

Contract Structure

The Faucet contract consists of the following components:

• State Variables:

  • lastDripTimestampByAddress: Tracks the last time tokens were dripped to an address.
  • lastDripTimestampByFid: Tracks the last time tokens were dripped to a specific fid.

• Events:

  • TokensDripped: Triggered when tokens are successfully dripped to an address.
  • TokensReceived: Triggered when the contract receives tokens.

• Functions:

  • constructor: Initializes the contract and sets the owner.
  • receive: Default fallback function to receive Ether.
  • fallback: Fallback function to receive Ether.
  • dripTokensToAddress: Allows the owner to drip tokens to a specified address.
  • withdraw: Allows the owner to withdraw Ether from the contract.

Deployed Contract

Arbitrum Sepolia

0x2aAB66f75ae1C34e5bDEF6fcfC58a641F2d3D9ed

Base Sepolia

0x2aAB66f75ae1C34e5bDEF6fcfC58a641F2d3D9ed

Mode Sepolia

0x2aAB66f75ae1C34e5bDEF6fcfC58a641F2d3D9ed

Usage

Build

 forge build

Test

 forge test

Format

 forge fmt

Gas Snapshots

 forge snapshot

Anvil

 anvil

Cast

 cast <subcommand>

Deploy

Create a copy of .env.sample and fill the details with your RPCs.

source .env.local

Importing Private Key

We will encrypt our private keys into a JSON format.

  cast wallet import defaultKey --interactive

You will then be promtpted to enter Private Key and a Password whenever you want to use it.

Check if the wallet is configured.

  cast wallet list

Base

 forge create --rpc-url $BASE_SEPOLIA_RPC  --account defaultKey  --etherscan-api-key $BASESCAN_SEPOLIA_API_KEY --verify src/Faucet.sol:Faucet

Arbitrum

 forge create --rpc-url $ARBITRUM_SEPOLIA_RPC   --account defaultKey   --etherscan-api-key $ARBISCAN_SEPOLIA_API_KEY --verify src/Faucet.sol:Faucet

Mode

forge create --rpc-url https://sepolia.mode.network --account defaultKey --verify --verifier blockscout --verifier-url https://sepolia.explorer.mode.network/api\? src/Faucet.sol:Faucet --priority-gas-price 1

Any Network

 forge create --rpc-url $RPC   --account defaultKey   --etherscan-api-key $ETHERSCAN_API_KEY --verify src/Faucet.sol:Faucet

Fund the contract

cast send <contract-address> --value 10ether -r $NETWORK_RPC  --account defaultKey   --etherscan-api-key $NETWORK_API_KEY

Help

forge --help
anvil --help
cast --help

Mode Error

It is possible you get the error

server returned an error response: error code -32000: transaction underpriced: gas tip cap 0, minimum needed 1

while posting transaction to Mode Sepolia. It is because the gas estimation is not done properly.

Solve it by adding a custom priority gas fee

--priority-gas-price 1

Tests

The Faucet contract is thoroughly tested to ensure its functionality. Test cases cover various scenarios such as dripping tokens, preventing multiple drips within 24 hours, balance thresholds, event emission, and ownership control.

File Structure

. ├── README.md ├── foundry.toml ├── remappings.txt ├── env.local ├── env.sample ├── script │ └── Faucet.sol ├── src │ └── Faucet.sol └── test └── Faucet.t.sol

Documentation

For more detailed documentation, refer to the Foundry Book.

Dependencies

• OpenZeppelin Contracts: Used for the Ownable contract.

License

This contract is licensed under the MIT License.

Author

@HAPPYS1NGH