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feat: implement distribution of rewards to L1 and L2 using a Reservoir
BREAKING CHANGE: remove setIssuanceRate from RewardsManager interface
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| // SPDX-License-Identifier: GPL-2.0-or-later | ||
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| pragma solidity ^0.7.6; | ||
| pragma abicoder v2; | ||
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| import "@openzeppelin/contracts/math/SafeMath.sol"; | ||
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| import "../../reservoir/IReservoir.sol"; | ||
| import "../../reservoir/Reservoir.sol"; | ||
| import "./L2ReservoirStorage.sol"; | ||
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| /** | ||
| * @title L2 Rewards Reservoir | ||
| * @dev TODO | ||
| */ | ||
| contract L2Reservoir is L2ReservoirV1Storage, Reservoir, IL2Reservoir { | ||
| using SafeMath for uint256; | ||
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| modifier onlyL2Gateway() { | ||
| require(msg.sender == _resolveContract(keccak256("GraphTokenGateway")), "ONLY_GATEWAY"); | ||
| _; | ||
| } | ||
|
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| /** | ||
| * @dev Initialize this contract. | ||
| * The contract will be paused. | ||
| * @param _controller Address of the Controller that manages this contract | ||
| */ | ||
| function initialize(address _controller) external onlyImpl { | ||
| Managed._initialize(_controller); | ||
| } | ||
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| function deltaRewards(uint256 t1, uint256 t0) | ||
| public | ||
| view | ||
| override(Reservoir, IReservoir) | ||
| returns (uint256) | ||
| { | ||
| if (issuanceRate <= MIN_ISSUANCE_RATE || t1 == t0) { | ||
| return 0; | ||
| } | ||
| return | ||
| normalizedTokenSupplyCache.mul(_pow(issuanceRate, t1.sub(t0), TOKEN_DECIMALS)).div( | ||
| TOKEN_DECIMALS | ||
| ); | ||
| } | ||
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| /** | ||
| * @dev TODO | ||
| * If we change bridge to use an onTokenTransfer function, we should make | ||
| * that function parse the calldata and call this. | ||
| */ | ||
| function receiveDrip(uint256 _normalizedTokenSupply, uint256 _issuanceRate) | ||
| external | ||
| override | ||
| onlyL2Gateway | ||
| { | ||
| if (_normalizedTokenSupply > normalizedTokenSupplyCache) { | ||
| if (_issuanceRate != issuanceRate) { | ||
| rewardsManager().updateAccRewardsPerSignal(); | ||
| snapshotAccumulatedRewards(); | ||
| issuanceRate = _issuanceRate; | ||
| } else { | ||
| snapshotAccumulatedRewards(); | ||
| } | ||
| normalizedTokenSupplyCache = _normalizedTokenSupply; | ||
| } | ||
| } | ||
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| function snapshotAccumulatedRewards() internal { | ||
| accumulatedLayerRewards = getAccumulatedRewards(block.number); | ||
| lastRewardsUpdateBlock = block.number; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| // SPDX-License-Identifier: GPL-2.0-or-later | ||
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| pragma solidity ^0.7.6; | ||
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| contract L2ReservoirV1Storage { | ||
| uint256 public normalizedTokenSupplyCache; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| // SPDX-License-Identifier: GPL-2.0-or-later | ||
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| pragma solidity ^0.7.6; | ||
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| interface IReservoir { | ||
| function approveRewardsManager() external; | ||
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| function getAccumulatedRewards(uint256 blocknum) external view returns (uint256); | ||
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| function deltaRewards(uint256 t1, uint256 t0) external view returns (uint256); | ||
| } | ||
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| interface IL2Reservoir is IReservoir { | ||
| function receiveDrip(uint256 _normalizedTokenSupply, uint256 _issuanceRate) external; | ||
| } |
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