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Fix coordinator lottery fairness #2507

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Fix coordinator lottery fairness #2507

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29 changes: 11 additions & 18 deletions frontend/src/utils/federationLottery.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -14,24 +14,17 @@
import defaultFederation from '../../static/federation.json';

export default function federationLottery(): string[] {
// Create an array to store the coordinator short aliases and their corresponding weights (chance)
const coordinatorChance: Array<{ shortAlias: string; chance: number }> = [];

// Convert the `federation` object into an array of {shortAlias, chance}
Object.values(defaultFederation).forEach((coor) => {
const chance = coor.badges.donatesToDevFund > 50 ? 50 : coor.badges?.donatesToDevFund;
coordinatorChance.push({ shortAlias: coor.shortAlias, chance });
});

// Sort randomly the coordinatorChance array using weighted shuffling algorithm
const shuffledCoordinators = coordinatorChance.sort((a, b) => {
return Math.random() * b.chance - Math.random() * a.chance;
});

// Extract the coordinator names from the shuffled array and return the result
const sortedCoordinators = shuffledCoordinators.map((coordinator) => coordinator.shortAlias);

return sortedCoordinators;
return Object.values(defaultFederation).map((coor) => {
const chance = coor.badges.donatesToDevFund > 50 ? 50 : coor.badges?.donatesToDevFund || 0;

return {
shortAlias: coor.shortAlias,
weight: chance > 0 ? -Math.log(Math.random()) / chance : Number.POSITIVE_INFINITY,
tie: Math.random(), // Add a random tie-breaker to ensure fairness in case of equal chances
}
})
.sort((a, b) => (a.weight - b.weight) || (a.tie - b.tie))
.map((coordinator) => coordinator.shortAlias);
}

// // Verification
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