index.js

import { createHodlInvoice, createInvoice } from 'ln-service'
import { datePivot } from '@/lib/time'
import { PAID_ACTION_PAYMENT_METHODS, USER_ID } from '@/lib/constants'
import { createHmac } from '@/api/resolvers/wallet'
import { Prisma } from '@prisma/client'
import { createWrappedInvoice, createInvoice as createUserInvoice } from '@/wallets/server'
import { assertBelowMaxPendingInvoices, assertBelowMaxPendingDirectPayments } from './lib/assert'
import { parseBolt11 } from '@/lib/bolt11'

import * as ITEM_CREATE from './itemCreate'
import * as ITEM_UPDATE from './itemUpdate'
import * as ZAP from './zap'
import * as DOWN_ZAP from './downZap'
import * as POLL_VOTE from './pollVote'
import * as TERRITORY_CREATE from './territoryCreate'
import * as TERRITORY_UPDATE from './territoryUpdate'
import * as TERRITORY_BILLING from './territoryBilling'
import * as TERRITORY_UNARCHIVE from './territoryUnarchive'
import * as DONATE from './donate'
import * as BOOST from './boost'
import * as RECEIVE from './receive'
import * as INVITE_GIFT from './inviteGift'

export const paidActions = {
  ITEM_CREATE,
  ITEM_UPDATE,
  ZAP,
  DOWN_ZAP,
  BOOST,
  POLL_VOTE,
  TERRITORY_CREATE,
  TERRITORY_UPDATE,
  TERRITORY_BILLING,
  TERRITORY_UNARCHIVE,
  DONATE,
  RECEIVE,
  INVITE_GIFT
}

export default async function performPaidAction (actionType, args, incomingContext) {
  try {
    const { me, models, forcePaymentMethod } = incomingContext
    const paidAction = paidActions[actionType]

    console.group('performPaidAction', actionType, args)

    if (!paidAction) {
      throw new Error(`Invalid action type ${actionType}`)
    }

    if (!me && !paidAction.anonable) {
      throw new Error('You must be logged in to perform this action')
    }

    // treat context as immutable
    const contextWithMe = {
      ...incomingContext,
      me: me ? await models.user.findUnique({ where: { id: parseInt(me.id) } }) : undefined
    }
    const context = {
      ...contextWithMe,
      cost: await paidAction.getCost(args, contextWithMe),
      sybilFeePercent: await paidAction.getSybilFeePercent?.(args, contextWithMe)
    }

    // special case for zero cost actions
    if (context.cost === 0n) {
      console.log('performing zero cost action')
      return await performNoInvoiceAction(actionType, args, { ...context, paymentMethod: 'ZERO_COST' })
    }

    for (const paymentMethod of paidAction.paymentMethods) {
      console.log(`considering payment method ${paymentMethod}`)
      const contextWithPaymentMethod = { ...context, paymentMethod }

      if (forcePaymentMethod &&
        paymentMethod !== forcePaymentMethod) {
        console.log('skipping payment method', paymentMethod, 'because forcePaymentMethod is set to', forcePaymentMethod)
        continue
      }

      // payment methods that anonymous users can use
      if (paymentMethod === PAID_ACTION_PAYMENT_METHODS.P2P) {
        try {
          return await performP2PAction(actionType, args, contextWithPaymentMethod)
        } catch (e) {
          if (e instanceof NonInvoiceablePeerError) {
            console.log('peer cannot be invoiced, skipping')
            continue
          }
          console.error(`${paymentMethod} action failed`, e)
          throw e
        }
      } else if (paymentMethod === PAID_ACTION_PAYMENT_METHODS.PESSIMISTIC) {
        return await beginPessimisticAction(actionType, args, contextWithPaymentMethod)
      }

      // additional payment methods that logged in users can use
      if (me) {
        if (paymentMethod === PAID_ACTION_PAYMENT_METHODS.FEE_CREDIT) {
          try {
            return await performNoInvoiceAction(actionType, args, contextWithPaymentMethod)
          } catch (e) {
            // if we fail with fee credits or reward sats, but not because of insufficient funds, bail
            console.error(`${paymentMethod} action failed`, e)
            if (!e.message.includes('\\"users\\" violates check constraint \\"msats_positive\\"') &&
              !e.message.includes('\\"users\\" violates check constraint \\"mcredits_positive\\"')) {
              throw e
            }
          }
        } else if (paymentMethod === PAID_ACTION_PAYMENT_METHODS.OPTIMISTIC) {
          return await performOptimisticAction(actionType, args, contextWithPaymentMethod)
        } else if (paymentMethod === PAID_ACTION_PAYMENT_METHODS.DIRECT) {
          try {
            return await performDirectAction(actionType, args, contextWithPaymentMethod)
          } catch (e) {
            if (e instanceof NonInvoiceablePeerError) {
              console.log('peer cannot be invoiced, skipping')
              continue
            }
            console.error(`${paymentMethod} action failed`, e)
            throw e
          }
        }
      }
    }

    throw new Error('No working payment method found')
  } catch (e) {
    console.error('performPaidAction failed', e)
    throw e
  } finally {
    console.groupEnd()
  }
}

async function performNoInvoiceAction (actionType, args, incomingContext) {
  const { me, models, cost, paymentMethod } = incomingContext
  const action = paidActions[actionType]

  const result = await models.$transaction(async tx => {
    const context = { ...incomingContext, tx }

    if (paymentMethod === 'FEE_CREDIT') {
      await tx.user.update({
        where: {
          id: me?.id ?? USER_ID.anon
        },
        data: { msats: { decrement: cost } }
      })
    }

    const result = await action.perform(args, context)
    await action.onPaid?.(result, context)

    return {
      result,
      paymentMethod
    }
  }, { isolationLevel: Prisma.TransactionIsolationLevel.ReadCommitted })

  // run non critical side effects in the background
  // after the transaction has been committed
  action.nonCriticalSideEffects?.(result.result, incomingContext).catch(console.error)
  return result
}

async function performOptimisticAction (actionType, args, incomingContext) {
  const { models, invoiceArgs: incomingInvoiceArgs } = incomingContext
  const action = paidActions[actionType]

  const optimisticContext = { ...incomingContext, optimistic: true }
  const invoiceArgs = incomingInvoiceArgs ?? await createSNInvoice(actionType, args, optimisticContext)

  return await models.$transaction(async tx => {
    const context = { ...optimisticContext, tx, invoiceArgs }

    const invoice = await createDbInvoice(actionType, args, context)

    return {
      invoice,
      result: await action.perform?.({ invoiceId: invoice.id, ...args }, context),
      paymentMethod: 'OPTIMISTIC'
    }
  }, { isolationLevel: Prisma.TransactionIsolationLevel.ReadCommitted })
}

async function beginPessimisticAction (actionType, args, context) {
  const action = paidActions[actionType]

  if (!action.paymentMethods.includes(PAID_ACTION_PAYMENT_METHODS.PESSIMISTIC)) {
    throw new Error(`This action ${actionType} does not support pessimistic invoicing`)
  }

  // just create the invoice and complete action when it's paid
  const invoiceArgs = context.invoiceArgs ?? await createSNInvoice(actionType, args, context)
  return {
    invoice: await createDbInvoice(actionType, args, { ...context, invoiceArgs }),
    paymentMethod: 'PESSIMISTIC'
  }
}

async function performP2PAction (actionType, args, incomingContext) {
  // if the action has an invoiceable peer, we'll create a peer invoice
  // wrap it, and return the wrapped invoice
  const { cost, sybilFeePercent, models, lnd, me } = incomingContext
  if (!sybilFeePercent) {
    throw new Error('sybil fee percent is not set for an invoiceable peer action')
  }

  const userId = await paidActions[actionType]?.getInvoiceablePeer?.(args, incomingContext)
  if (!userId) {
    throw new NonInvoiceablePeerError()
  }

  let context
  try {
    await assertBelowMaxPendingInvoices(incomingContext)

    const description = await paidActions[actionType].describe(args, incomingContext)
    const { invoice, wrappedInvoice, wallet, maxFee } = await createWrappedInvoice(userId, {
      msats: cost,
      feePercent: sybilFeePercent,
      description,
      expiry: INVOICE_EXPIRE_SECS
    }, { models, me, lnd })

    context = {
      ...incomingContext,
      invoiceArgs: {
        bolt11: invoice,
        wrappedBolt11: wrappedInvoice,
        wallet,
        maxFee
      }
    }
  } catch (e) {
    console.error('failed to create wrapped invoice', e)
    throw new NonInvoiceablePeerError()
  }

  return me
    ? await performOptimisticAction(actionType, args, context)
    : await beginPessimisticAction(actionType, args, context)
}

// we don't need to use the module for perform-ing outside actions
// because we can't track the state of outside invoices we aren't paid/paying
async function performDirectAction (actionType, args, incomingContext) {
  const { models, lnd, cost } = incomingContext
  const { comment, lud18Data, noteStr, description: actionDescription } = args

  const userId = await paidActions[actionType]?.getInvoiceablePeer?.(args, incomingContext)
  if (!userId) {
    throw new NonInvoiceablePeerError()
  }

  let invoiceObject

  try {
    await assertBelowMaxPendingDirectPayments(userId, incomingContext)

    const description = actionDescription ?? await paidActions[actionType].describe(args, incomingContext)
    invoiceObject = await createUserInvoice(userId, {
      msats: cost,
      description,
      expiry: INVOICE_EXPIRE_SECS,
      supportBolt12: false // direct payment is not supported to bolt12 for compatibility reasons
    }, { models, lnd })
  } catch (e) {
    console.error('failed to create outside invoice', e)
    throw new NonInvoiceablePeerError()
  }

  const { invoice, wallet } = invoiceObject
  const hash = await parseBolt11({ request: invoice }).id

  const payment = await models.directPayment.create({
    data: {
      comment,
      lud18Data,
      desc: noteStr,
      bolt11: invoice,
      msats: cost,
      hash,
      walletId: wallet.id,
      receiverId: userId
    }
  })

  return {
    invoice: payment,
    paymentMethod: 'DIRECT'
  }
}

export async function retryPaidAction (actionType, args, incomingContext) {
  const { models, me } = incomingContext
  const { invoice: failedInvoice } = args

  console.log('retryPaidAction', actionType, args)

  const action = paidActions[actionType]
  if (!action) {
    throw new Error(`retryPaidAction - invalid action type ${actionType}`)
  }

  if (!me) {
    throw new Error(`retryPaidAction - must be logged in ${actionType}`)
  }

  if (!failedInvoice) {
    throw new Error(`retryPaidAction - missing invoice ${actionType}`)
  }

  const { msatsRequested, actionId, actionArgs, actionOptimistic } = failedInvoice
  const retryContext = {
    ...incomingContext,
    optimistic: actionOptimistic,
    me: await models.user.findUnique({ where: { id: parseInt(me.id) } }),
    cost: BigInt(msatsRequested),
    actionId,
    predecessorId: failedInvoice.id
  }

  let invoiceArgs
  const invoiceForward = await models.invoiceForward.findUnique({
    where: {
      invoiceId: failedInvoice.id
    },
    include: {
      wallet: true
    }
  })

  if (invoiceForward) {
    // this is a wrapped invoice, we need to retry it with receiver fallbacks
    try {
      const { userId } = invoiceForward.wallet
      // this will return an invoice from the first receiver wallet that didn't fail yet and throw if none is available
      const { invoice: bolt11, wrappedInvoice: wrappedBolt11, wallet, maxFee } = await createWrappedInvoice(userId, {
        msats: failedInvoice.msatsRequested,
        feePercent: await action.getSybilFeePercent?.(actionArgs, retryContext),
        description: await action.describe?.(actionArgs, retryContext),
        expiry: INVOICE_EXPIRE_SECS
      }, retryContext)
      invoiceArgs = { bolt11, wrappedBolt11, wallet, maxFee }
    } catch (err) {
      console.log('failed to retry wrapped invoice, falling back to SN:', err)
    }
  }

  invoiceArgs ??= await createSNInvoice(actionType, actionArgs, retryContext)

  return await models.$transaction(async tx => {
    const context = { ...retryContext, tx, invoiceArgs }

    // update the old invoice to RETRYING, so that it's not confused with FAILED
    await tx.invoice.update({
      where: {
        id: failedInvoice.id,
        actionState: 'FAILED'
      },
      data: {
        actionState: 'RETRYING'
      }
    })

    // create a new invoice
    const invoice = await createDbInvoice(actionType, actionArgs, context)

    return {
      result: await action.retry?.({ invoiceId: failedInvoice.id, newInvoiceId: invoice.id }, context),
      invoice,
      paymentMethod: actionOptimistic ? 'OPTIMISTIC' : 'PESSIMISTIC'
    }
  }, { isolationLevel: Prisma.TransactionIsolationLevel.ReadCommitted })
}

const INVOICE_EXPIRE_SECS = 600

export class NonInvoiceablePeerError extends Error {
  constructor () {
    super('non invoiceable peer')
    this.name = 'NonInvoiceablePeerError'
  }
}

// we seperate the invoice creation into two functions because
// because if lnd is slow, it'll timeout the interactive tx
async function createSNInvoice (actionType, args, context) {
  const { me, lnd, cost, optimistic } = context
  const action = paidActions[actionType]
  const createLNDInvoice = optimistic ? createInvoice : createHodlInvoice

  await assertBelowMaxPendingInvoices(context)

  if (cost < 1000n) {
    // sanity check
    throw new Error('The cost of the action must be at least 1 sat')
  }

  const expiresAt = datePivot(new Date(), { seconds: INVOICE_EXPIRE_SECS })
  const invoice = await createLNDInvoice({
    description: me?.hideInvoiceDesc ? undefined : await action.describe(args, context),
    lnd,
    mtokens: String(cost),
    expires_at: expiresAt
  })
  return { bolt11: invoice.request, preimage: invoice.secret }
}

async function createDbInvoice (actionType, args, context) {
  const { me, models, tx, cost, optimistic, actionId, invoiceArgs, predecessorId } = context
  const { bolt11, wrappedBolt11, preimage, wallet, maxFee } = invoiceArgs

  const db = tx ?? models

  if (cost < 1000n) {
    // sanity check
    throw new Error('The cost of the action must be at least 1 sat')
  }

  // note: served invoice is always bolt11
  const servedBolt11 = wrappedBolt11 ?? bolt11
  const servedInvoice = await parseBolt11({ request: servedBolt11 })
  const expiresAt = new Date(servedInvoice.expires_at)

  const invoiceData = {
    hash: servedInvoice.id,
    msatsRequested: BigInt(servedInvoice.mtokens),
    preimage,
    bolt11: servedBolt11,
    userId: me?.id ?? USER_ID.anon,
    actionType,
    actionState: wrappedBolt11 ? 'PENDING_HELD' : optimistic ? 'PENDING' : 'PENDING_HELD',
    actionOptimistic: optimistic,
    actionArgs: args,
    expiresAt,
    actionId,
    predecessorId
  }

  let invoice
  if (wrappedBolt11) {
    invoice = (await db.invoiceForward.create({
      include: { invoice: true },
      data: {
        bolt11,
        maxFeeMsats: maxFee,
        invoice: {
          create: invoiceData
        },
        wallet: {
          connect: {
            id: wallet.id
          }
        }
      }
    })).invoice
  } else {
    invoice = await db.invoice.create({ data: invoiceData })
  }

  // insert a job to check the invoice after it's set to expire
  await db.$executeRaw`
      INSERT INTO pgboss.job (name, data, retrylimit, retrybackoff, startafter, expirein, priority)
      VALUES ('checkInvoice',
        jsonb_build_object('hash', ${invoice.hash}::TEXT), 21, true,
          ${expiresAt}::TIMESTAMP WITH TIME ZONE,
          ${expiresAt}::TIMESTAMP WITH TIME ZONE - now() + interval '10m', 100)`

  // the HMAC is only returned during invoice creation
  // this makes sure that only the person who created this invoice
  // has access to the HMAC
  invoice.hmac = createHmac(invoice.hash)

  return invoice
}