stacker.news/api/resolvers/wallet.js

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import { createInvoice, decodePaymentRequest, subscribeToPayViaRequest } from 'ln-service'
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import { UserInputError, AuthenticationError } from 'apollo-server-micro'
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import serialize from './serial'
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export default {
Query: {
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invoice: async (parent, { id }, { me, models, lnd }) => {
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if (!me) {
throw new AuthenticationError('you must be logged in')
}
const inv = await models.invoice.findUnique({
where: {
id: Number(id)
},
include: {
user: true
}
})
if (inv.user.name !== me.name) {
throw new AuthenticationError('not ur invoice')
}
return inv
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},
withdrawl: async (parent, { id }, { me, models, lnd }) => {
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if (!me) {
throw new AuthenticationError('you must be logged in')
}
const wdrwl = await models.withdrawl.findUnique({
where: {
id: Number(id)
},
include: {
user: true
}
})
if (wdrwl.user.name !== me.name) {
throw new AuthenticationError('not ur withdrawl')
}
return wdrwl
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}
},
Mutation: {
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createInvoice: async (parent, { amount }, { me, models, lnd }) => {
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if (!me) {
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throw new AuthenticationError('you must be logged in')
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}
if (!amount || amount <= 0) {
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throw new UserInputError('amount must be positive', { argumentName: 'amount' })
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}
// set expires at to 3 hours into future
const expiresAt = new Date(new Date().setHours(new Date().getHours() + 3))
const description = `${amount} sats for @${me.name} on stacker.news`
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const invoice = await createInvoice({
description,
lnd,
tokens: amount,
expires_at: expiresAt
})
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const data = {
hash: invoice.id,
bolt11: invoice.request,
expiresAt: expiresAt,
msatsRequested: amount * 1000,
user: {
connect: {
name: me.name
}
}
}
return await models.invoice.create({ data })
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},
createWithdrawl: async (parent, { invoice, maxFee }, { me, models, lnd }) => {
if (!me) {
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throw new AuthenticationError('you must be logged in')
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}
// decode invoice to get amount
const decoded = await decodePaymentRequest({ lnd, request: invoice })
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const msatsFee = Number(maxFee) * 1000
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// create withdrawl transactionally (id, bolt11, amount, fee)
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const [withdrawl] = await serialize(models,
models.$queryRaw`SELECT * FROM create_withdrawl(${decoded.id}, ${invoice},
${Number(decoded.mtokens)}, ${msatsFee}, ${me.name})`)
// create the payment, subscribing to its status
const sub = subscribeToPayViaRequest({
lnd,
request: invoice,
// can't use max_fee_mtokens https://github.com/alexbosworth/ln-service/issues/141
max_fee: Number(maxFee),
pathfinding_timeout: 30000
})
// if it's confirmed, update confirmed returning extra fees to user
sub.on('confirmed', async e => {
console.log(e)
// mtokens also contains the fee
const fee = Number(e.fee_mtokens)
const paid = Number(e.mtokens) - fee
await serialize(models, models.$queryRaw`
SELECT confirm_withdrawl(${withdrawl.id}, ${paid}, ${fee})`)
})
// if the payment fails, we need to
// 1. return the funds to the user
// 2. update the widthdrawl as failed
sub.on('failed', async e => {
console.log(e)
let status = 'UNKNOWN_FAILURE'
if (e.is_insufficient_balance) {
status = 'INSUFFICIENT_BALANCE'
} else if (e.is_invalid_payment) {
status = 'INVALID_PAYMENT'
} else if (e.is_pathfinding_timeout) {
status = 'PATHFINDING_TIMEOUT'
} else if (e.is_route_not_found) {
status = 'ROUTE_NOT_FOUND'
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}
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await serialize(models, models.$queryRaw`
SELECT reverse_withdrawl(${withdrawl.id}, ${status})`)
})
return withdrawl
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}
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},
Withdrawl: {
satsPaying: w => Math.floor(w.msatsPaying / 1000),
satsPaid: w => Math.floor(w.msatsPaid / 1000),
satsFeePaying: w => Math.floor(w.msatsFeePaying / 1000),
satsFeePaid: w => Math.floor(w.msatsFeePaid / 1000)
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}
}