139 lines
4.8 KiB
TypeScript
139 lines
4.8 KiB
TypeScript
import * as functions from 'firebase-functions'
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import * as admin from 'firebase-admin'
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import { CPMMContract } from '../../common/contract'
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import { User } from '../../common/user'
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import { subtractObjects } from '../../common/util/object'
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import { LiquidityProvision } from '../../common/liquidity-provision'
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import { getUserLiquidityShares } from '../../common/calculate-cpmm'
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import { Bet } from '../../common/bet'
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import { getProbability } from '../../common/calculate'
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import { noFees } from '../../common/fees'
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import { APIError } from './api'
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import { redeemShares } from './redeem-shares'
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export const withdrawLiquidity = functions
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.runWith({ minInstances: 1 })
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.https.onCall(
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async (
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data: {
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contractId: string
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},
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context
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) => {
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const userId = context?.auth?.uid
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if (!userId) return { status: 'error', message: 'Not authorized' }
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const { contractId } = data
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if (!contractId)
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return { status: 'error', message: 'Missing contract id' }
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return await firestore
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.runTransaction(async (trans) => {
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const lpDoc = firestore.doc(`users/${userId}`)
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const lpSnap = await trans.get(lpDoc)
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if (!lpSnap.exists) throw new APIError(400, 'User not found.')
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const lp = lpSnap.data() as User
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const contractDoc = firestore.doc(`contracts/${contractId}`)
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const contractSnap = await trans.get(contractDoc)
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if (!contractSnap.exists)
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throw new APIError(400, 'Contract not found.')
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const contract = contractSnap.data() as CPMMContract
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const liquidityCollection = firestore.collection(
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`contracts/${contractId}/liquidity`
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)
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const liquiditiesSnap = await trans.get(liquidityCollection)
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const liquidities = liquiditiesSnap.docs.map(
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(doc) => doc.data() as LiquidityProvision
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)
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const userShares = getUserLiquidityShares(
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userId,
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contract,
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liquidities
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)
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// zero all added amounts for now
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// can add support for partial withdrawals in the future
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liquiditiesSnap.docs
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.filter(
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(_, i) =>
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!liquidities[i].isAnte && liquidities[i].userId === userId
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)
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.forEach((doc) => trans.update(doc.ref, { amount: 0 }))
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const payout = Math.min(...Object.values(userShares))
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if (payout <= 0) return {}
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const newBalance = lp.balance + payout
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const newTotalDeposits = lp.totalDeposits + payout
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trans.update(lpDoc, {
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balance: newBalance,
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totalDeposits: newTotalDeposits,
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} as Partial<User>)
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const newPool = subtractObjects(contract.pool, userShares)
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const minPoolShares = Math.min(...Object.values(newPool))
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const adjustedTotal = contract.totalLiquidity - payout
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// total liquidity is a bogus number; use minPoolShares to prevent from going negative
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const newTotalLiquidity = Math.max(adjustedTotal, minPoolShares)
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trans.update(contractDoc, {
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pool: newPool,
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totalLiquidity: newTotalLiquidity,
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})
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const prob = getProbability(contract)
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// surplus shares become user's bets
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const bets = Object.entries(userShares)
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.map(([outcome, shares]) =>
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shares - payout < 1 // don't create bet if less than 1 share
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? undefined
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: ({
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userId: userId,
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contractId: contract.id,
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amount:
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(outcome === 'YES' ? prob : 1 - prob) * (shares - payout),
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shares: shares - payout,
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outcome,
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probBefore: prob,
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probAfter: prob,
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createdTime: Date.now(),
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isLiquidityProvision: true,
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fees: noFees,
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} as Omit<Bet, 'id'>)
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)
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.filter((x) => x !== undefined)
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for (const bet of bets) {
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const doc = firestore
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.collection(`contracts/${contract.id}/bets`)
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.doc()
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trans.create(doc, { id: doc.id, ...bet })
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}
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return userShares
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})
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.then(async (result) => {
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// redeem surplus bet with pre-existing bets
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await redeemShares(userId, contractId)
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console.log('userid', userId, 'withdraws', result)
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return { status: 'success', userShares: result }
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})
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.catch((e) => {
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return { status: 'error', message: e.message }
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})
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}
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)
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const firestore = admin.firestore()
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