2021-12-11 00:06:17 +00:00
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import * as admin from 'firebase-admin'
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2022-01-10 21:07:57 +00:00
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import { Contract } from '../../common/contract'
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import { User } from '../../common/user'
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2021-12-11 00:06:17 +00:00
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export const getValue = async <T>(collection: string, doc: string) => {
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2022-01-07 00:05:48 +00:00
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const snap = await admin.firestore().collection(collection).doc(doc).get()
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2021-12-11 00:06:17 +00:00
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2022-01-07 00:05:48 +00:00
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return snap.exists ? (snap.data() as T) : undefined
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}
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export const getValues = async <T>(query: admin.firestore.Query) => {
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const snap = await query.get()
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return snap.docs.map((doc) => doc.data() as T)
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2021-12-11 00:06:17 +00:00
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}
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export const getContract = (contractId: string) => {
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return getValue<Contract>('contracts', contractId)
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}
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export const getUser = (userId: string) => {
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return getValue<User>('users', userId)
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2022-01-07 00:05:48 +00:00
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}
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2022-01-10 22:48:48 +00:00
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2022-01-18 07:18:38 +00:00
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export const getUserByUsername = async (username: string) => {
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const snap = await firestore
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.collection('users')
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.where('username', '==', username)
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.get()
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return snap.empty ? undefined : (snap.docs[0].data() as User)
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}
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2022-01-10 22:48:48 +00:00
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const firestore = admin.firestore()
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const updateUserBalance = (userId: string, delta: number) => {
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return firestore.runTransaction(async (transaction) => {
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const userDoc = firestore.doc(`users/${userId}`)
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const userSnap = await transaction.get(userDoc)
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if (!userSnap.exists) return
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const user = userSnap.data() as User
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const newUserBalance = user.balance + delta
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if (newUserBalance < 0)
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throw new Error(
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`User (${userId}) balance cannot be negative: ${newUserBalance}`
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)
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transaction.update(userDoc, { balance: newUserBalance })
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})
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}
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export const payUser = (userId: string, payout: number) => {
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if (!isFinite(payout) || payout <= 0)
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throw new Error('Payout is not positive: ' + payout)
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return updateUserBalance(userId, payout)
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}
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export const chargeUser = (userId: string, charge: number) => {
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if (!isFinite(charge) || charge <= 0)
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throw new Error('User charge is not positive: ' + charge)
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return updateUserBalance(userId, -charge)
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}
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