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placeBet: always run 1 instance

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This commit is contained in:
mantikoros 2021-12-10 21:45:05 -06:00
parent 8867d841cb
commit 62ea1bab15
1 changed files with 32 additions and 30 deletions
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62
functions/src/place-bet.ts
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@ -5,46 +5,48 @@ import { Contract } from './types/contract'
import { User } from './types/user' import { User } from './types/user'
import { Bet } from './types/bet' import { Bet } from './types/bet'
export const placeBet = functions.https.onCall(async (data: { export const placeBet = functions
amount: number .runWith({ minInstances: 1 })
outcome: string .https.onCall(async (data: {
contractId: string amount: number
}, context) => { outcome: string
const userId = context?.auth?.uid contractId: string
if (!userId) }, context) => {
return { status: 'error', message: 'Not authorized' } const userId = context?.auth?.uid
if (!userId)
return { status: 'error', message: 'Not authorized' }
const { amount, outcome, contractId } = data const { amount, outcome, contractId } = data
if (outcome !== 'YES' && outcome !== 'NO') if (outcome !== 'YES' && outcome !== 'NO')
return { status: 'error', message: 'Invalid outcome' } return { status: 'error', message: 'Invalid outcome' }
// run as transaction to prevent race conditions // run as transaction to prevent race conditions
return await firestore.runTransaction(async transaction => { return await firestore.runTransaction(async transaction => {
const userDoc = firestore.doc(`users/${userId}`) const userDoc = firestore.doc(`users/${userId}`)
const userSnap = await transaction.get(userDoc) const userSnap = await transaction.get(userDoc)
if (!userSnap.exists) return { status: 'error', message: 'User not found' } if (!userSnap.exists) return { status: 'error', message: 'User not found' }
const user = userSnap.data() as User const user = userSnap.data() as User
if (user.balanceUsd < amount) if (user.balanceUsd < amount)
return { status: 'error', message: 'Insufficient balance' } return { status: 'error', message: 'Insufficient balance' }
const contractDoc = firestore.doc(`contracts/${contractId}`) const contractDoc = firestore.doc(`contracts/${contractId}`)
const contractSnap = await transaction.get(contractDoc) const contractSnap = await transaction.get(contractDoc)
if (!contractSnap.exists) return { status: 'error', message: 'Invalid contract' } if (!contractSnap.exists) return { status: 'error', message: 'Invalid contract' }
const contract = contractSnap.data() as Contract const contract = contractSnap.data() as Contract
const newBetDoc = firestore.collection(`contracts/${contractId}/bets`).doc() const newBetDoc = firestore.collection(`contracts/${contractId}/bets`).doc()
const { newBet, newPot, newBalance } = getNewBetInfo(user, outcome, amount, contract, newBetDoc.id) const { newBet, newPot, newBalance } = getNewBetInfo(user, outcome, amount, contract, newBetDoc.id)
transaction.create(newBetDoc, newBet) transaction.create(newBetDoc, newBet)
transaction.update(contractDoc, { pot: newPot }) transaction.update(contractDoc, { pot: newPot })
transaction.update(userDoc, { balanceUsd: newBalance }) transaction.update(userDoc, { balanceUsd: newBalance })
return { status: 'success' } return { status: 'success' }
})
}) })
})
const firestore = admin.firestore() const firestore = admin.firestore()