improve handling of ratchet error

lib/cash-in-tx.js

@@ -76,6 +76,7 @@ function ensureRatchet (oldField, newField, fieldKey) {
   const free = ['sendPending', 'error', 'errorCode', 'customerId']
 
   if (_.isNil(oldField)) return true
+
   if (_.includes(fieldKey, monotonic)) return isMonotonic(oldField, newField, fieldKey)
 
   if (_.includes(fieldKey, free)) {
@@ -106,7 +107,7 @@ function diff (oldTx, newTx) {
       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')
+      throw new E.RatchetError('Value from lamassu-machine would violate ratchet')
     }
 
     updatedTx[fieldKey] = newField

lib/cash-out-tx.js

@@ -245,7 +245,6 @@ function preProcess (oldTx, newTx, pi) {
     const hasDispenseOccurred = !dispenseOccurred(oldTx.bills) && dispenseOccurred(newTx.bills)
 
     if (hasError || hasDispenseOccurred) {
-      console.log('DEBUG100')
       return logDispense(updatedTx)
       .then(updateCassettes(updatedTx))
     }

lib/error.js

@@ -23,3 +23,4 @@ register('BadNumberError')
 register('NoDataError')
 register('InsufficientFundsError')
 register('StaleTxError')
+register('RatchetError')

lib/routes.js

@@ -123,7 +123,9 @@ function postTx (req, res, next) {
     return res.json(tx)
   })
   .catch(err => {
-    if (err instanceof E.StaleTxError) return res.status(404).json({})
+    if (err instanceof E.StaleTxError) return res.status(409).json({})
+    if (err instanceof E.RatchetError) return res.status(409).json({})
+
     throw err
   })
   .catch(next)