PoolTogether captures a portion of the yield produced by the prize pools as "reserve". The percentage of yield that is captured is called the "reserve rate".

Currently (before this implementation) there is a single, global reserve rate that is applied to all pools. However, PoolTogether governance will like to set a higher reserve rate for governance-managed pools, and do not wish to affect community pools.

The Configurable Reserve contracts outline a new Reserve interface that will allow governance to configure a reserve rate for each pool separately, as well as setting an opt-out default rate across all prize pools.

A prize pools reserve rate can be set by calling:

function setReserveRateMantissa(address[] calldata sources,  uint224[] calldata _reserveRates, bool[] calldata useCustom) external;

The useCustom boolean flag overrides the use of the default pool-wide reserve rate. Note that only the owner of the contract can call this function. In the case of PoolTogether the owner will be the governance (timelock) contract.

A prize pools reserve rate can be viewed by calling:

function reserveRateMantissa(address source) external view returns (uint256);

The default reserve rate across all prize pools can be set with:

function setDefaultReserveRateMantissa(uint224 _reserveRateMantissa) external override

Note: only the contract owner can call this function.

The concept of a withdrawStrategist allows the reserve to be withdrawn by a custom withdrawStrategist address. This can be set by calling:

function setWithdrawStrategist(address _strategist) external override onlyOwner{

Note: only the contract ower can call this function.

The actual reserve amount can be withdrawn from a prize pool by either the contract owner or the withdrawStrategist by calling:

 function withdrawReserve(address prizePool, address to) external override onlyOwnerOrWithdrawStrategist returns (uint256)

To setup repo install with: yarn

Setup environmental variables with: cp .envrc.example .envrc and fill .envrc with your own variables and api keys.

Import the environmental variables with: direnv allow

To deploy locally for development run: yarn deploy localhost

Ensure HDWALLET_MNEMONIC is set in .envrc and run: yarn deploy <network-name>

Ensure ETHERSCAN_API_KEY is set in .envrc and run: yarn verify <network-name>

To test the contracts locally run: yarn && yarn test

To display contract coverage run: yarn coverage

After specifying the fork block in hardhat.networks.js, start the mainnet fork with: yarn start-fork

In another terminal window run: yarn fork-run ./scripts/setupReserve.js

The prize pools lookup where the reserve rates are set at the ReserveRegistry (https://etherscan.io/address/0x3e8b9901dbfe766d3fe44b36c180a1bca2b9a295).

This Registry contract is owned by the PoolTogether governance system (specifically the timelock contract).

This Registry can now be updated to instead point at the ConfigurableReserve (https://etherscan.io/address/0xd1797D46C3E825fce5215a0259D3426a5c49455C) by the timelock calling:

function register(address _pointer) external onlyOwner