refactor cash-in and cash-out

lib/cash-in/cash-in-low.js

@@ -0,0 +1,137 @@
+const _ = require('lodash/fp')
+const pgp = require('pg-promise')()
+
+const BN = require('../bn')
+const T = require('../time')
+const logger = require('../logger')
+
+const PENDING_INTERVAL_MS = 60 * T.minutes
+
+const massage = _.flow(_.omit(['direction', 'cryptoNetwork', 'bills']),
+  convertBigNumFields, _.mapKeys(_.snakeCase))
+
+module.exports = {toObj, upsert, insert, update, massage, isClearToSend}
+
+function convertBigNumFields (obj) {
+  const convert = value => value && value.isBigNumber
+  ? value.toString()
+  : value
+
+  return _.mapValues(convert, obj)
+}
+
+function toObj (row) {
+  if (!row) return null
+
+  const keys = _.keys(row)
+  let newObj = {}
+
+  keys.forEach(key => {
+    const objKey = _.camelCase(key)
+    if (_.includes(key, ['crypto_atoms', 'fiat', 'cash_in_fee', 'cash_in_fee_crypto'])) {
+      newObj[objKey] = BN(row[key])
+      return
+    }
+
+    newObj[objKey] = row[key]
+  })
+
+  newObj.direction = 'cashIn'
+
+  return newObj
+}
+
+function upsert (t, dbTx, preProcessedTx) {
+  if (!dbTx) {
+    return insert(t, preProcessedTx)
+    .then(tx => ({dbTx, tx}))
+  }
+
+  return update(t, dbTx, diff(dbTx, preProcessedTx))
+  .then(tx => ({dbTx, tx}))
+}
+
+function insert (t, tx) {
+  const dbTx = massage(tx)
+  const sql = pgp.helpers.insert(dbTx, null, 'cash_in_txs') + ' returning *'
+  return t.one(sql)
+  .then(toObj)
+}
+
+function update (t, tx, changes) {
+  if (_.isEmpty(changes)) return Promise.resolve(tx)
+
+  const dbChanges = massage(changes)
+  const sql = pgp.helpers.update(dbChanges, null, 'cash_in_txs') +
+    pgp.as.format(' where id=$1', [tx.id]) + ' returning *'
+
+  return t.one(sql)
+  .then(toObj)
+}
+
+function diff (oldTx, newTx) {
+  let updatedTx = {}
+
+  if (!oldTx) throw new Error('oldTx must not be null')
+  if (!newTx) throw new Error('newTx must not be null')
+
+  _.forEach(fieldKey => {
+    const oldField = oldTx[fieldKey]
+    const newField = newTx[fieldKey]
+    if (fieldKey === 'bills') return
+    if (_.isEqualWith(nilEqual, oldField, newField)) return
+
+    if (!ensureRatchet(oldField, newField, fieldKey)) {
+      logger.warn('Value from lamassu-machine would violate ratchet [%s]', fieldKey)
+      logger.warn('Old tx: %j', oldTx)
+      logger.warn('New tx: %j', newTx)
+      throw new Error('Value from lamassu-machine would violate ratchet')
+    }
+
+    updatedTx[fieldKey] = newField
+  }, _.keys(newTx))
+
+  return updatedTx
+}
+
+function ensureRatchet (oldField, newField, fieldKey) {
+  const monotonic = ['cryptoAtoms', 'fiat', 'cashInFeeCrypto', 'send', 'sendConfirmed', 'operatorCompleted', 'timedout', 'txVersion']
+  const free = ['sendPending', 'error', 'errorCode', 'customerId']
+
+  if (_.isNil(oldField)) return true
+  if (_.includes(fieldKey, monotonic)) return isMonotonic(oldField, newField, fieldKey)
+
+  if (_.includes(fieldKey, free)) {
+    if (_.isNil(newField)) return false
+    return true
+  }
+
+  if (_.isNil(newField)) return false
+  if (oldField.isBigNumber && newField.isBigNumber) return BN(oldField).eq(newField)
+  if (oldField.toString() === newField.toString()) return true
+
+  return false
+}
+
+function isMonotonic (oldField, newField, fieldKey) {
+  if (_.isNil(newField)) return false
+  if (_.isBoolean(oldField)) return oldField === newField || !oldField
+  if (oldField.isBigNumber) return oldField.lte(newField)
+  if (_.isNumber(oldField)) return oldField <= newField
+
+  throw new Error(`Unexpected value [${fieldKey}]: ${oldField}, ${newField}`)
+}
+
+function nilEqual (a, b) {
+  if (_.isNil(a) && _.isNil(b)) return true
+
+  return undefined
+}
+
+function isClearToSend (oldTx, newTx) {
+  const now = Date.now()
+
+  return newTx.send &&
+    (!oldTx || (!oldTx.sendPending && !oldTx.sendConfirmed)) &&
+    (newTx.created > now - PENDING_INTERVAL_MS)
+}