add cancel script

lib/cash-out-tx.js

@@ -12,7 +12,8 @@ module.exports = {
   post,
   monitorLiveIncoming,
   monitorStaleIncoming,
-  monitorUnnotified
+  monitorUnnotified,
+  cancel
 }
 
 const mapValuesWithKey = _.mapValues.convert({cap: false})
@@ -273,3 +274,21 @@ function monitorUnnotified (settings) {
   .then(txs => Promise.all(txs.map(notify)))
   .catch(logger.error)
 }
+
+function cancel (txId) {
+  const updateRec = {
+    'dispense_time': 'now()^',
+    dispense_error: 'Operator cancel',
+    dispensed: true
+  }
+
+  return Promise.resolve()
+  .then(() => {
+    return pgp.helpers.update(updateRec, null, 'cash_out_txs') +
+      pgp.as.format(' where id=$1', [txId])
+  })
+  .then(sql => db.result(sql, false))
+  .then(res => {
+    if (res.rowCount !== 1) throw new Error('No such tx-id')
+  })
+}