Import consts and util fns instead of re-defining

Author: s1na

src/index.js

@@ -13,23 +13,16 @@ const Buffer = require('safe-buffer').Buffer
 const BN = ethUtil.BN
 const rlp = ethUtil.rlp
 const DBManager = require('./dbManager')
-
-// geth compatible db keys
-const headHeaderKey = 'LastHeader' // current canonical head for light sync
-const headBlockKey = 'LastBlock' // current canonical head for full sync
-const headerPrefix = Buffer.from('h') // headerPrefix + number + hash -> header
-const tdSuffix = Buffer.from('t') // headerPrefix + number + hash + tdSuffix -> td
-const numSuffix = Buffer.from('n') // headerPrefix + number + numSuffix -> hash
-const blockHashPrefix = Buffer.from('H') // blockHashPrefix + hash -> number
-const bodyPrefix = Buffer.from('b') // bodyPrefix + number + hash -> block body
-
-// utility functions
-const bufBE8 = n => n.toArrayLike(Buffer, 'be', 8) // convert BN to big endian Buffer
-const tdKey = (n, hash) => Buffer.concat([headerPrefix, bufBE8(n), hash, tdSuffix])
-const headerKey = (n, hash) => Buffer.concat([headerPrefix, bufBE8(n), hash])
-const bodyKey = (n, hash) => Buffer.concat([bodyPrefix, bufBE8(n), hash])
-const numberToHashKey = n => Buffer.concat([headerPrefix, bufBE8(n), numSuffix])
-const hashToNumberKey = hash => Buffer.concat([blockHashPrefix, hash])
+const {
+  tdKey,
+  headerKey,
+  bodyKey,
+  headHeaderKey,
+  headBlockKey,
+  hashToNumberKey,
+  numberToHashKey,
+  bufBE8
+} = require('./util')
 
 module.exports = class Blockchain {
   constructor (opts) {