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Contracts

Repo for Saturn Payouts Solidity Contracts

Note: never run the new-payout cli command multiple times. Even in the case of a failure, this will ALWAYS result in at least part of the payments being dispersed more than once. Work with the output files suffixed with FailedPayouts to recover from failures.

What's this

The first contract implements a simple payment splitter which, when instantiated, takes in a list of payees and shares owed.

/**
* @dev Creates an instance of `PaymentSplitterNativeAddr` where each account in `payees` is assigned the number of shares at
* the matching position in the `shares` array.
*
* All addresses in `payees` must be non-zero. Both arrays must have the same non-zero length, and there must be no
* duplicates in `payees`.
*/
function initialize(
        CommonTypes.FilAddress[] memory payees_,
        uint256[] memory shares_
    ) external payable

The release function can then be triggered to release payments owed to a specific account.

/**
* @dev Triggers a transfer to `account` of the amount of FIL they are owed, according to their percentage of the
* total shares and their previous withdrawals.
*/
function release(CommonTypes.FilAddress memory account) public virtual {...}

The second contract is a payout factory contract. Its core functionality, which is to instantiate and fund a new payment splitter contract, can only be invoked by the admin user of the contract.

/**
* @dev Spins up a new payment splitter.
*/
function payout(CommonTypes.FilAddress[] memory payees_, uint256[] memory shares_)
	external
	onlyRole(DEFAULT_ADMIN_ROLE)
	returns (address instance) {...}

The contract also keeps track of all past payout contracts such that we can query it for all unclaimed tokens linked to a specific address. If this value is non nil we can also release all funds linked to an address.

/**
* @dev Returns the total claimable amount over all previously generated payout contracts.
* @param account The address of the payee.
*/
function releasable(CommonTypes.FilAddress memory account)
	external
	view
	returns (uint256 totalValue) {...}

/**
* @dev Releases all available funds in previously generated payout contracts.
* @param account The address of the payee.
*/
function releaseAll(CommonTypes.FilAddress memory account) external {...}

/**
* @dev Releases all available funds in a single previously generated payout contract.
* @param account The fil address of the payee.
* @param index Index of the payout contract.
*/
function _releasePayout(CommonTypes.FilAddress memory account, uint256 index) private {...}

The third contract, is a simple evaluator which keeps track of how much each payee is owed in a given evaluation period. For now this value can only be incremented by way of rewardPayee. This contract is also bundled with a PayoutFactory upon construction. The evaluator contract is the admin of the factory which enables it to generate new payouts at the end of a given evaluation period. It uses an internal mapping (mapping(uint256 => mapping(address => uint256)) private _shares) as values for the payout. Whereby this mapping is reset after the call. )

How to

We recommend installing foundry from source:

git clone https://github.com/foundry-rs/foundry
cd foundry
# install cast + forge
cargo install --path ./cli --profile local --bins --locked --force
# install anvil
cargo install --path ./anvil --profile local --locked --force

To run tests:

forge test

Note: TO run these tests with commonly used solidity framework we have duplicated contracts which use Ethereum-based addressing for payouts -- the tests are run over these contracts, not the Filecoin-based addressing contracts.

To run slither analyzer:

conda create -n contracts python=3.9
conda activate contracts
pip3 install slither-analyzer
slither .

To run echidna fuzzing tests, first install echidna, then you can find echidna specific tests within test/echidna and run:

echidna-test test/echidna/PaymentSplitterTest.sol --contract TestPaymentSplitter --config echidnaconfig.yaml

Bindings

Foundry generates bindings for solidity contracts that allow for programmatic interactions with the generated contracts through Rust. This comes in handy for writing deployment scripts, gas estimation, etc.

To generate the bindings we use the forge bind commmand and select desired contracts as follows:

forge bind  --select "(?:^|\W)PayoutFactoryNativeAddr|PaymentSplitterNativeAddr(?:$|\W)" --crate-name contract-bindings -b ./cli/bindings

Cli

Installation

First install

curl https://sh.rustup.rs -sSf | sh

Then install the cli by running:

cargo install --path cli

Alternatively you can install without cloning this repo:

cargo install --git https://github.com/filecoin-saturn/contracts cli

You can then get cli usage help using:

saturn-contracts --help

---

Note:

The cli command examples given below assume you are using a local wallet.

If you want to use a Ledger Wallet, you can do so but only with the Filecoin mainnet.

1. Please replace the RPC API with https://api.calibration.node.glif.io/rpc/v1
2. Ensure your Ledger wallet is connected and unlocked and the Ethereum app is open on it.
3. Ensure Ledger Live is open and the Ethereum app is open on it.
4. Ensure that the Filecoin mainnet FIL address/EVM address that corresponds with your Ledger Ethereum address has funds in it.
5. Ensure that the blind_signing option is turned on in the Ethereum App in Ledger.

---

To use the bindings as scripts to deploy and interact with contracts first create a ./secrets/secret file within ./cli containing your mnemonic string (note this should only be used for testing purposes !).

Claiming Earnings using the CLI

The CLI can be used to claim earnings for Saturn Node Operators. The earnings are claimed using a wallet. There following methods are supported for claiming your earnings:

• Ledger Hardware Wallet (Both Ethereum and Filecoin Apps are supported to be used)
• Lotus Node Wallets
• Using Private Key (This is only recommended for testing usage)

Inspecting your Earning Status

Node operators can inspect their earnings using the inspect-earnings command.

To inspect your earnings, run:

saturn-contracts -- --rpc-url $RPC_URL inspect-earnings --address $NODE_FIL_ADDRESS --factory-address $CONTRACT_FIL_ADDRESS

• $NODE_FIL_ADDRESS represents the Filecoin address of the Saturn Node.
• $CONTRACT_FIL_ADDRESS is the Filecoin Address of the Payouts Factory Contract

Claiming your Earnings

Node operators can inspect their earnings using the inspect-earnings command.

To claim your earnings, run:

saturn-contracts -- --rpc-url $RPC_URL claim --addr-to-claim $NODE_FIL_ADDRESS --factory-addr $CONTRACT_FIL_ADDRESS --method "ledger"

• $NODE_FIL_ADDRESS represents the Filecoin address of the Saturn Node.

• $CONTRACT_FIL_ADDRESS is the Filecoin Address of the Payouts Factory Contract

• --method refers to the method you will be claiming with and has three options:

  • ledger -> claim with your ledger wallet.
  • lotus -> claim with your lotus node.
  • local -> claim using a private key (recommended only for testing).

If you use local, the supported key types are BLS and SECP256K1. For both key types, using the hex encoded are ascii encoded version of the key is supported.

Multisig Payouts:

A multisig is a filecoin actor (contract) where are a certain number of signatories are required to submit transactions. Each signer much approve a transaction before it is submitted on the blockchain. The Payout deployment process is governed by a multisig. This significantly enhances the security of operating the contract due to the following properties:

• No single party or entity has absolute control over the payout factory contract.
• In the case that one of the signatories is no longer available due ot any circumstance, the contract can still be operated and recovered.
• In the case that one of the signatories is compromised by an attacker, it does not give the attacker control over the payout factory contract.
• The signatories can vote to add/remove other new signatories.

Proposing a new payout

cd ./cli
cargo run --bin saturn-contracts -- -U $RPC_URL --retries=10 propose-new-payout --actor-address $MULTISIG_ADDRESS  --receiver-address $CONTRACT_FIL_ADDRESS --payout-csv ./{path to payouts csv} --method ledger

Inspecting a Multisig

Inspecting a multisig returns the following information:

• Balance of the multisig.
• Signatories on the multisig.
• Pending transactions.

To inspect a multisig's state, run the following:

cd ./cli
cargo run --bin saturn-contracts -- -U $RPC_URL --retries=10 multisig-inspect --actor-id $MSIG_ACTOR_ID

Approving a new payout

To approve a pending payout transaction on a multisig, run the following:

cd ./cli
cargo run --bin saturn-contracts -- -U $RPC_URL --retries=10 approve --actor-address $MULTISIG_ADDRESS  --transaction-id $TX_ID --method ledger

The transaction-id here refers to the transaction id of the message being approved.

Cancel a multisig transaction

To cancel a pending payout transaction on a multisig, run the following:

cd ./cli
cargo run --bin saturn-contracts -- -U $RPC_URL --retries=10 cancel --actor-address $MULTISIG_ADDRESS  --transaction-id $TX_ID --method ledger

The transaction-id here refers to the transaction id of the message being cancelled.

Approve all transactions on a multisig

To cancel a pending payout transaction on a multisig, run the following:

cd ./cli
cargo run --bin saturn-contracts -- -U $RPC_URL --retries=10 approve-all --actor-address $MULTISIG_ADDRESS --method ledger

Cancel all transactions on a multisig

To cancel a pending payout transaction on a multisig, run the following:

cd ./cli
cargo run --bin saturn-contracts -- -U $RPC_URL --retries=10 cancel-all --actor-address $MULTISIG_ADDRESS --method ledger

Payout Factory Deployment

cd ./cli
cargo run --bin saturn-contracts -- -S secrets/.secret -U https://api.calibration.node.glif.io/rpc/v1 --retries=10 deploy

Note: The --retries parameter sets a number of times to poll a pending transaction before considering it as having failed. Because of the differences in block times between Filecoin / Hyperspace and Ethereum, ethers-rs can sometimes timeout prematurely before a transaction has truly failed or succeeded (ethers-rs has been built with Ethereum in mind). --retries has a default value of 10, which empirically we have found to result in successful transactions.

Payment Splitter Deployments

Make sure your deployed factory has sufficient funds for the subsequent payouts. You can fund it using (assuming your wallet has sufficient FIL):

cd ./cli
cargo run --bin saturn-contracts -- -S secrets/.secret -U https://api.hyperspace.node.glif.io/rpc/v1 --retries=10 fund -F $FACTORY_ADDRESS -A $PAYOUT_AMOUNT

Using a CSV file:

To deploy a new PaymentSplitter from a deployed PayoutFactory contract using a CSV file:

• Set an env var called FACTORY_ADDRESS with the address of the deployed PayoutFactory.
• Generate a csv file with the headers payee,shares and fill out the rows with pairs of addresses and shares.

For instance:

payee,shares
t1ypi542zmmgaltijzw4byonei5c267ev5iif2liy,1
t410f4bmm756u5kft2czgqll4oybvtch3jj5v64yjeya,1

Now run:

cd ./cli
cargo run --bin saturn-contracts -- -S secrets/.secret -U https://api.hyperspace.node.glif.io/rpc/v1 --retries=10 new-payout -F $FACTORY_ADDRESS -P ./secrets/payouts.csv

Using a Database:

To deploy a new PaymentSplitter from a deployed PayoutFactory contract using a database connection:

• The CLI queries a table called payments that has the following columns:
  • A fil_wallet_address columns which is a text type.
  • A fil_earned which is a numeric type.
• Generate a local .env file to store DB credentials. There is a .env-example file in the root directory of the cli that outlines the exact variables required to establish a database connection. Here are variables you need:
  • PG_PASSWORD
  • PG_HOST
  • PG_DATABASE
  • PG_PORT
  • PG_USER
• Note that some databases might require an ssh tunnel to establish a connection. If the database connection requires an ssh tunnel then the PG_HOST and PG_PORT should point to the ssh tunnel.

Run:

cd ./cli
cargo run --bin saturn-contracts -- -S secrets/.secret -U https://api.hyperspace.node.glif.io/rpc/v1 --retries=10 new-payout -F $FACTORY_ADDRESS --db-deploy

Claiming Earnings

You can then claim funds for a specific payee using the cli:

cd ./cli
cargo run --bin saturn-contracts -- -S secrets/.secret -U https://api.hyperspace.node.glif.io/rpc/v1 --retries=10 claim -F $FACTORY_ADDRESS -A $CLAIM_ADDRESS

Write PayoutFactory Abi

To write the PayoutFactory abi to a JSON file, you can use the write-abi command as such:

cd ./cli
cargo run --bin saturn-contracts -- -S secrets/.secret -U https://api.hyperspace.node.glif.io/rpc/v1 --retries=10 write-abi -P $ABI_PATH

Write Payout CSVs:

The generate-monthly-payouts command generates the monthly payout csv's for saturn. For the operation of the cassini group, this command generates three CSV files:

This requires a database connection:

• Generate a local .env file to store DB credentials. There is a .env-example file in the root directory of the cli that outlines the exact variables required to establish a database connection. Here are variables you need:
  • PG_PASSWORD
  • PG_HOST
  • PG_DATABASE
  • PG_PORT
  • PG_USER

To run the command:

cd ./cli
cargo run --bin saturn-contracts -- --retries=10 generate-monthly-payout -D 2023-01 -F $FILECOIN_FACTORY_ADRESS

Hardhat Integration

This Foundry project has been integrated with Hardhat using the hardhat-foundry plugin. This integration enables using Hardhat on top of the Foundry project structure.

Note that dependencies still need to be installed using forge(forge install) as we want to manage dependencies as git modules rather than npm modules.

Setup Hardhat

npm i

Compile contracts

npx hardhat compile

Deploy the Evaluator contract to the local Hardhat network

Example hardhat deploy script provided at script/hardhat_evaluator_deploy.js

npx hardhat run --network hardhat script/hardhat_evaluator_deploy.js

Deploy a contract to the Goerli testnet

1. Rename the .env.example to .env and fill in the required values for the environment variables
2. Uncomment the goerli network config in the hardhat.config.js file
3. Run npx hardhat run script/hardhat_evaluator_deploy.js --network goerli

For more stuff you can do with Hardhat, see the Hardhat Docs.