PoRTAL Code explanation
Let's break down this Solidity function <getListingBounty> step by step:
Purpose:
This function calculates the reward and bounty associated with a listing based on the time it has been listed. It's likely used in a decentralized marketplace or platform where users can list items for sale or rent.
Parameters:
ListingId: A unique identifier for the listing you want to calculate the bounty for variables:
TargetListing: This variable stores the details of the listing retrieved from the listings mapping using the listingId. It's likely a structure containing information like the listing date, reward amount, and bounty amount.
RewardMAX: This variable defines the maximum reward that can be earned for a listing. It's set to half of dailyBountyMAX, which is likely a global constant representing the maximum daily bounty.
Datelisted: This variable stores the timestamp when the listing was created.
Currenttime: This variable captures the current timestamp using block timestamp.
Dayselapsed: This variable calculates the number of days that have passed since the listing was created.
It divides the difference between currenttime and datelisted by listingRewardTimeframe, which is likely a constant representing the duration of a reward period (e.g., 24 hours). reward: This variable calculates the reward earned for the listing based on the mkfReward (likely the initial reward amount) and the number of days elapsed. bounty: This variable calculates the bounty earned for the listing based on the mkfBounty (likely the initial bounty amount) and the number of days elapsed. total: This variable sums the reward and bounty to get the total amount earned for the listing.
Retrieve Listing Data: The function first retrieves the listing details from the listings mapping using the provided listingId. Calculate Time Elapsed: It then calculates the number of days that have passed since the listing was created.
Calculate Reward and Bounty: The function multiplies the initial reward (mkfReward) and bounty (mkfBounty) by the number of days elapsed to determine the current reward and bounty amounts.
Apply Maximum Limits: The function checks if the calculated reward exceeds dailyBountyMAX. If it does, it caps the reward at dailyBountyMAX. Similarly, it checks if the calculated bounty exceeds rewardMAX and caps it accordingly. Calculate Total: Finally, the function adds the reward and bounty to calculate the total amount earned for the listing.
Return Value: The function returns a tuple containing three values.
Reward: The calculated reward amount. bounty: The calculated bounty amount. total: The total amount earned for the listing. Example:
Let's say a listing was created 5 days ago with an initial reward of 100 tokens and a bounty of 50 tokens. Assuming dailyBountyMAX is 200 and listingRewardTimeframe is 24 hours:
Reward = 100 tokens * 5 days = 500 tokens Bounty = 50 tokens * 5 days = 250 tokens Since reward exceeds dailyBountyMAX, it's capped at 200 tokens. total = 200 tokens + 250 tokens = 450 tokens the function would return (200, 250, 450).
Key Points:
This function implements a time-based reward system for listings. It ensures that the reward and bounty amounts don't exceed predefined maximum limits. The function is likely used in a decentralized marketplace or platform to incentivize users to list items and engage with the platform.
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