5217270073
* Add the great Zod as a dependency to help us * Tweak eslint * Rewrite a ton of stuff in createContract and placeBet * Clean up error reporting in API * Make sure the UI is enforcing validated limits on lengths * Remove unnecessary Math.abs * Better type on `BetInfo` * Kill `manaLimitPerUser` * Clean up hacky parameters on bet info functions * Validate `closeTime` as a valid timestamp in the future
205 lines
5.2 KiB
TypeScript
205 lines
5.2 KiB
TypeScript
import { sumBy } from 'lodash'
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import { Bet, MAX_LOAN_PER_CONTRACT, NumericBet } from './bet'
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import {
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calculateDpmShares,
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getDpmProbability,
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getDpmOutcomeProbability,
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getNumericBets,
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calculateNumericDpmShares,
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} from './calculate-dpm'
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import { calculateCpmmPurchase, getCpmmProbability } from './calculate-cpmm'
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import {
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Binary,
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CPMM,
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DPM,
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FreeResponse,
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FullContract,
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Multi,
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NumericContract,
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} from './contract'
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import { noFees } from './fees'
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import { addObjects } from './util/object'
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import { NUMERIC_FIXED_VAR } from './numeric-constants'
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export type CandidateBet<T extends Bet> = Omit<T, 'id' | 'userId'>
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export type BetInfo = {
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newBet: CandidateBet<Bet>
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newPool?: { [outcome: string]: number }
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newTotalShares?: { [outcome: string]: number }
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newTotalBets?: { [outcome: string]: number }
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newTotalLiquidity?: number
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newP?: number
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}
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export const getNewBinaryCpmmBetInfo = (
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outcome: 'YES' | 'NO',
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amount: number,
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contract: FullContract<CPMM, Binary>,
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loanAmount: number
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) => {
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const { shares, newPool, newP, fees } = calculateCpmmPurchase(
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contract,
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amount,
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outcome
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)
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const { pool, p, totalLiquidity } = contract
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const probBefore = getCpmmProbability(pool, p)
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const probAfter = getCpmmProbability(newPool, newP)
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const newBet: CandidateBet<Bet> = {
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contractId: contract.id,
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amount,
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shares,
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outcome,
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fees,
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loanAmount,
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probBefore,
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probAfter,
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createdTime: Date.now(),
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}
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const { liquidityFee } = fees
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const newTotalLiquidity = (totalLiquidity ?? 0) + liquidityFee
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return { newBet, newPool, newP, newTotalLiquidity }
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}
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export const getNewBinaryDpmBetInfo = (
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outcome: 'YES' | 'NO',
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amount: number,
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contract: FullContract<DPM, Binary>,
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loanAmount: number
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) => {
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const { YES: yesPool, NO: noPool } = contract.pool
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const newPool =
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outcome === 'YES'
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? { YES: yesPool + amount, NO: noPool }
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: { YES: yesPool, NO: noPool + amount }
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const shares = calculateDpmShares(contract.totalShares, amount, outcome)
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const { YES: yesShares, NO: noShares } = contract.totalShares
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const newTotalShares =
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outcome === 'YES'
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? { YES: yesShares + shares, NO: noShares }
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: { YES: yesShares, NO: noShares + shares }
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const { YES: yesBets, NO: noBets } = contract.totalBets
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const newTotalBets =
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outcome === 'YES'
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? { YES: yesBets + amount, NO: noBets }
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: { YES: yesBets, NO: noBets + amount }
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const probBefore = getDpmProbability(contract.totalShares)
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const probAfter = getDpmProbability(newTotalShares)
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const newBet: CandidateBet<Bet> = {
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contractId: contract.id,
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amount,
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loanAmount,
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shares,
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outcome,
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probBefore,
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probAfter,
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createdTime: Date.now(),
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fees: noFees,
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}
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return { newBet, newPool, newTotalShares, newTotalBets }
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}
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export const getNewMultiBetInfo = (
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outcome: string,
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amount: number,
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contract: FullContract<DPM, Multi | FreeResponse>,
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loanAmount: number
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) => {
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const { pool, totalShares, totalBets } = contract
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const prevOutcomePool = pool[outcome] ?? 0
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const newPool = { ...pool, [outcome]: prevOutcomePool + amount }
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const shares = calculateDpmShares(contract.totalShares, amount, outcome)
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const prevShares = totalShares[outcome] ?? 0
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const newTotalShares = { ...totalShares, [outcome]: prevShares + shares }
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const prevTotalBets = totalBets[outcome] ?? 0
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const newTotalBets = { ...totalBets, [outcome]: prevTotalBets + amount }
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const probBefore = getDpmOutcomeProbability(totalShares, outcome)
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const probAfter = getDpmOutcomeProbability(newTotalShares, outcome)
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const newBet: CandidateBet<Bet> = {
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contractId: contract.id,
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amount,
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loanAmount,
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shares,
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outcome,
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probBefore,
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probAfter,
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createdTime: Date.now(),
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fees: noFees,
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}
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return { newBet, newPool, newTotalShares, newTotalBets }
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}
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export const getNumericBetsInfo = (
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value: number,
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outcome: string,
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amount: number,
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contract: NumericContract
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) => {
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const { pool, totalShares, totalBets } = contract
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const bets = getNumericBets(contract, outcome, amount, NUMERIC_FIXED_VAR)
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const allBetAmounts = Object.fromEntries(bets)
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const newTotalBets = addObjects(totalBets, allBetAmounts)
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const newPool = addObjects(pool, allBetAmounts)
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const { shares, totalShares: newTotalShares } = calculateNumericDpmShares(
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contract.totalShares,
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bets
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)
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const allOutcomeShares = Object.fromEntries(
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bets.map(([outcome], i) => [outcome, shares[i]])
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)
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const probBefore = getDpmOutcomeProbability(totalShares, outcome)
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const probAfter = getDpmOutcomeProbability(newTotalShares, outcome)
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const newBet: CandidateBet<NumericBet> = {
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contractId: contract.id,
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value,
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amount,
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allBetAmounts,
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shares: shares.find((s, i) => bets[i][0] === outcome) ?? 0,
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allOutcomeShares,
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outcome,
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probBefore,
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probAfter,
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createdTime: Date.now(),
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fees: noFees,
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}
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return { newBet, newPool, newTotalShares, newTotalBets }
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}
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export const getLoanAmount = (yourBets: Bet[], newBetAmount: number) => {
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const openBets = yourBets.filter((bet) => !bet.isSold && !bet.sale)
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const prevLoanAmount = sumBy(openBets, (bet) => bet.loanAmount ?? 0)
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const loanAmount = Math.min(
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newBetAmount,
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MAX_LOAN_PER_CONTRACT - prevLoanAmount
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)
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return loanAmount
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}
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