Chore: move tx code into atomic function

lib/cash-in/cash-in-atomic.js

@@ -1,6 +1,7 @@
 const _ = require('lodash/fp')
 const pgp = require('pg-promise')()
 
+const db = require('../db')
 const E = require('../error')
 
 const cashInLow = require('./cash-in-low')
@@ -8,6 +9,9 @@ const cashInLow = require('./cash-in-low')
 module.exports = { atomic }
 
 function atomic (machineTx, pi) {
+  const TransactionMode = pgp.txMode.TransactionMode
+  const isolationLevel = pgp.txMode.isolationLevel
+  const mode = new TransactionMode({ tiLevel: isolationLevel.serializable })
   function transaction (t) {
     const sql = 'select * from cash_in_txs where id=$1'
     const sql2 = 'select * from bills where cash_in_txs_id=$1'
@@ -29,7 +33,7 @@ function atomic (machineTx, pi) {
           })
       })
   }
-  return transaction
+  return db.tx({ mode }, transaction)
 }
 
 function insertNewBills (t, billRows, machineTx) {