86 lines
2.8 KiB
JavaScript
86 lines
2.8 KiB
JavaScript
const _ = require('lodash/fp')
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const pgp = require('pg-promise')()
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const db = require('../db')
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const E = require('../error')
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const cashInLow = require('./cash-in-low')
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module.exports = { atomic }
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function atomic (machineTx, pi) {
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const TransactionMode = pgp.txMode.TransactionMode
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const isolationLevel = pgp.txMode.isolationLevel
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const mode = new TransactionMode({ tiLevel: isolationLevel.serializable })
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function transaction (t) {
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const sql = 'select * from cash_in_txs where id=$1'
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const sql2 = 'select * from bills where cash_in_txs_id=$1'
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return t.oneOrNone(sql, [machineTx.id])
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.then(row => {
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if (row && row.tx_version >= machineTx.txVersion) throw new E.StaleTxError('Stale tx')
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return t.any(sql2, [machineTx.id])
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.then(billRows => {
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const dbTx = cashInLow.toObj(row)
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return preProcess(dbTx, machineTx, pi)
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.then(preProcessedTx => cashInLow.upsert(t, dbTx, preProcessedTx))
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.then(r => {
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return insertNewBills(t, billRows, machineTx)
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.then(newBills => _.set('newBills', newBills, r))
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})
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})
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})
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}
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return db.tx({ mode }, transaction)
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}
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function insertNewBills (t, billRows, machineTx) {
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const bills = pullNewBills(billRows, machineTx)
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if (_.isEmpty(bills)) return Promise.resolve([])
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const dbBills = _.map(cashInLow.massage, bills)
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const columns = ['id', 'fiat', 'fiat_code', 'crypto_code', 'cash_in_fee', 'cash_in_txs_id', 'device_time']
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const sql = pgp.helpers.insert(dbBills, columns, 'bills')
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const deviceID = machineTx.deviceId
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const sql2 = `update devices set cashbox = cashbox + $2
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where device_id = $1`
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return t.none(sql2, [deviceID, dbBills.length])
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.then(() => {
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return t.none(sql)
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})
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.then(() => bills)
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}
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function pullNewBills (billRows, machineTx) {
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if (_.isEmpty(machineTx.bills)) return []
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const toBill = _.mapKeys(_.camelCase)
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const bills = _.map(toBill, billRows)
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return _.differenceBy(_.get('id'), machineTx.bills, bills)
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}
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function preProcess (dbTx, machineTx, pi) {
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// Note: The way this works is if we're clear to send,
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// we mark the transaction as sendPending.
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//
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// If another process is trying to also mark this as sendPending
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// that means that it saw the tx as sendPending=false.
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// But if that's true, then it must be serialized before this
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// (otherwise it would see sendPending=true), and therefore we can't
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// be seeing sendPending=false (a pre-condition of clearToSend()).
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// Therefore, one of the conflicting transactions will error,
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// which is what we want.
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return new Promise(resolve => {
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if (!dbTx) return resolve(machineTx)
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if (cashInLow.isClearToSend(dbTx, machineTx)) {
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return resolve(_.set('sendPending', true, machineTx))
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}
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return resolve(machineTx)
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})
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}
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