114 lines
3.4 KiB
TypeScript
114 lines
3.4 KiB
TypeScript
import * as functions from 'firebase-functions'
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import * as admin from 'firebase-admin'
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import { Contract } from '../../common/contract'
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import { User } from '../../common/user'
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import { getNewMultiBetInfo } from '../../common/new-bet'
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import { Answer } from '../../common/answer'
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import { getValues } from './utils'
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export const createAnswer = functions.runWith({ minInstances: 1 }).https.onCall(
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async (
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data: {
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contractId: string
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amount: number
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text: 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, amount, text } = data
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if (amount <= 0 || isNaN(amount) || !isFinite(amount))
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return { status: 'error', message: 'Invalid amount' }
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if (!text || typeof text !== 'string' || text.length > 10000)
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return { status: 'error', message: 'Invalid text' }
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// Run as transaction to prevent race conditions.
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return await firestore.runTransaction(async (transaction) => {
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const userDoc = firestore.doc(`users/${userId}`)
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const userSnap = await transaction.get(userDoc)
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if (!userSnap.exists)
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return { status: 'error', message: 'User not found' }
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const user = userSnap.data() as User
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if (user.balance < amount)
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return { status: 'error', message: 'Insufficient balance' }
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const contractDoc = firestore.doc(`contracts/${contractId}`)
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const contractSnap = await transaction.get(contractDoc)
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if (!contractSnap.exists)
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return { status: 'error', message: 'Invalid contract' }
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const contract = contractSnap.data() as Contract
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if (
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contract.outcomeType !== 'MULTI' ||
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contract.outcomes !== 'FREE_ANSWER'
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)
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return {
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status: 'error',
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message: 'Requires a multi, free answer contract',
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}
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const { closeTime } = contract
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if (closeTime && Date.now() > closeTime)
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return { status: 'error', message: 'Trading is closed' }
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const [lastAnswer] = await getValues<Answer>(
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firestore
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.collection(`contracts/${contractId}/answers`)
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.orderBy('number', 'desc')
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.limit(1)
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)
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if (!lastAnswer)
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return { status: 'error', message: 'Could not fetch last answer' }
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const number = lastAnswer.number + 1
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const id = `${number}`
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const newAnswerDoc = firestore
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.collection(`contracts/${contractId}/answers`)
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.doc(id)
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const answerId = newAnswerDoc.id
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const { username, name, avatarUrl } = user
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const answer: Answer = {
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id,
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number,
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contractId,
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createdTime: Date.now(),
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userId: user.id,
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username,
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name,
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avatarUrl,
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text,
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}
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transaction.create(newAnswerDoc, answer)
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const newBetDoc = firestore
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.collection(`contracts/${contractId}/bets`)
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.doc()
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const { newBet, newPool, newTotalShares, newTotalBets, newBalance } =
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getNewMultiBetInfo(user, answerId, amount, contract, newBetDoc.id)
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transaction.create(newBetDoc, { ...newBet, isAnte: true })
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transaction.update(contractDoc, {
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pool: newPool,
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totalShares: newTotalShares,
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totalBets: newTotalBets,
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})
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transaction.update(userDoc, { balance: newBalance })
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return { status: 'success', answerId, betId: newBetDoc.id }
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})
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}
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)
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const firestore = admin.firestore()
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