refactor cash-in and cash-out

lib/cash-out/cash-out-low.js

@@ -0,0 +1,64 @@
+const _ = require('lodash/fp')
+const pgp = require('pg-promise')()
+
+const helper = require('./cash-out-helper')
+
+const toDb = helper.toDb
+const toObj = helper.toObj
+
+const UPDATEABLE_FIELDS = ['txHash', 'txVersion', 'status', 'dispense', 'dispenseConfirmed',
+  'notified', 'redeem', 'phone', 'error', 'swept', 'publishedAt', 'confirmedAt']
+
+module.exports = {upsert, update, insert}
+
+function upsert (t, oldTx, tx) {
+  if (!oldTx) {
+    return insert(t, tx)
+    .then(newTx => [oldTx, newTx])
+  }
+
+  return update(t, tx, diff(oldTx, tx))
+  .then(newTx => [oldTx, newTx])
+}
+
+function insert (t, tx) {
+  const dbTx = toDb(tx)
+
+  const sql = pgp.helpers.insert(dbTx, null, 'cash_out_txs') + ' returning *'
+  return t.one(sql)
+  .then(toObj)
+}
+
+function update (t, tx, changes) {
+  if (_.isEmpty(changes)) return Promise.resolve(tx)
+
+  const dbChanges = toDb(changes)
+  const sql = pgp.helpers.update(dbChanges, null, 'cash_out_txs') +
+    pgp.as.format(' where id=$1', [tx.id])
+
+  const newTx = _.merge(tx, changes)
+
+  return t.none(sql)
+  .then(() => newTx)
+}
+
+function diff (oldTx, newTx) {
+  let updatedTx = {}
+
+  UPDATEABLE_FIELDS.forEach(fieldKey => {
+    if (oldTx && _.isEqualWith(nilEqual, oldTx[fieldKey], newTx[fieldKey])) return
+
+    // We never null out an existing field
+    if (oldTx && _.isNil(newTx[fieldKey])) return
+
+    updatedTx[fieldKey] = newTx[fieldKey]
+  })
+
+  return updatedTx
+}
+
+function nilEqual (a, b) {
+  if (_.isNil(a) && _.isNil(b)) return true
+
+  return undefined
+}