Challenges
Revest Challenge
My project builds off of the current RevestV2 to enable token streaming for the time-based locks. This utilizes the FNFTs, and gives them a new capability.
Project details
All code: https://github.com/TrentConley/RevestV2-Streaming
I built a way to stream tokens using the revest fnfts. I created two different ways to stream the tokens in the FNFTs, one quadratic, and one linear. I achieved this by modifying the contracts in RevestV2. Specifically, I added a new way to mint a batch where I mint one fnft for each second between the creation data and when the time lock will expire. This way, I have many tokens I can withdraw at given points in time. I created several withdraw function,
1. withdrawFNFTSteam(uint fnftId): This function allows a user to withdraw FNFTs linearly based on the time passed since the creation of the FNFT. The quantity of FNFTs to be withdrawn is calculated as the difference between the current timestamp and the creation time of the FNFT, minus the amount already withdrawn. The function then burns the calculated quantity of FNFTs from the user's balance and updates the withdrawn amount and last withdrawn time for the FNFT.
2. withdrawFNFTSteamQuadratic(uint fnftId): This function allows a user to withdraw FNFTs based on a quadratic formula. The quantity of FNFTs to be withdrawn is calculated as the square of the time passed since the creation of the FNFT divided by the total time, minus the amount already withdrawn. Similar to the previous function, it burns the calculated quantity of FNFTs from the user's balance and updates the withdrawn amount and last withdrawn time for the FNFT.
I also wrote several tests to test these function.
1. testWithdrawFNFTSteam(): This function tests the withdrawal of FNFTs in a linear time stream. It mints a new FNFT with a time lock, then simulates the passage of time by skipping forward 1 week. It then calls the withdrawFNFTSteam function and checks that the balance of the user (Alice) has increased by the expected amount and that the total supply of FNFTs has decreased correctly.
2. testWithdrawFNFTSteamQuadratic(): This function tests the withdrawal of FNFTs in a quadratic time stream. The setup is similar to the previous function, but this time it calls the withdrawFNFTSteamQuadratic function for withdrawal. It checks that the balance of the user (Alice) has increased by half the expected amount (since the withdrawal rate is quadratic, not linear) and that the total supply of FNFTs has decreased correctly.
3. testWithdrawFNFTSteamQuadraticOffset(): This function tests the withdrawal of FNFTs in a quadratic time stream with an offset. The setup is similar to the previous function, but this time it skips forward 4 days instead of 1 week. It then calls the withdrawFNFTSteamQuadratic function for withdrawal and checks that the balance of the user (Alice) has increased by the expected amount divided by a multiplier (to account for the offset) and that the total supply of FNFTs has decreased correctly.
I also modified much of the other code to support carrying out these functionalities, such as bypassing the lock manager, updating interfaces, etc.
The code passes all the test cases, and all the code can be found here https://github.com/TrentConley/RevestV2-Streaming