[MASTER-RELEASE] Byzantium changes

CHANGELOG.md

@@ -6,8 +6,11 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 
-## [1.7.0] - Unreleased
-- TODO
+## [1.7.0] - Unreleased (``master`` branch)
+- ``Metro-Byzantium`` compatible
+- New difficulty formula (EIP 100)
+- Difficulty bomb delay (EIP 649)
+- Removed ``isHomestead``, ``isHomesteadReprice`` from API methods
 
 [1.7.0]: https://github.com/ethereumjs/ethereumjs-vm/compare/v1.6.0...v1.7.0
 

docs/index.md

@@ -24,18 +24,6 @@ Determines if a given block is the genesis block
 
 Returns **any** Boolean
 
-## isHomestead
-
-Determines if a given block part of homestead or not
-
-Returns **any** Boolean
-
-## isHomesteadReprice
-
-Determines if a given block part of homestead reprice or not
-
-Returns **any** Boolean
-
 ## setGenesisParams
 
 turns the block in to the canonical genesis block

header.js

@@ -93,26 +93,24 @@ BlockHeader.prototype.canonicalDifficulty = function (parentBlock) {
   var offset = parentDif.div(new BN(params.difficultyBoundDivisor.v))
   var dif
 
-  if (this.isHomestead()) {
-    // homestead
-    // 1 - (block_timestamp - parent_timestamp) // 10
-    var a = blockTs.sub(parentTs).idivn(10).ineg().iaddn(1)
-    var cutoff = new BN(-99)
-    // MAX(cutoff, a)
-    if (cutoff.cmp(a) === 1) {
-      a = cutoff
-    }
-    dif = parentDif.add(offset.mul(a))
-  } else {
-    // prehomestead
-    if (parentTs.addn(params.durationLimit.v).cmp(blockTs) === 1) {
-      dif = offset.add(parentDif)
-    } else {
-      dif = parentDif.sub(offset)
-    }
+  // Byzantium
+  // max((2 if len(parent.uncles) else 1) - ((timestamp - parent.timestamp) // 9), -99)
+  var uncleAddend = parentBlock.header.uncleHash.equals(utils.SHA3_RLP_ARRAY) ? 1 : 2
+  var a = blockTs.sub(parentTs).idivn(9).ineg().iaddn(uncleAddend)
+  var cutoff = new BN(-99)
+  // MAX(cutoff, a)
+  if (cutoff.cmp(a) === 1) {
+    a = cutoff
+  }
+  dif = parentDif.add(offset.mul(a))
+
+  // Byzantium difficulty bomb delay
+  var num = new BN(this.number).isubn(3000000)
+  if (num.ltn(0)) {
+    num = new BN(0)
   }
 
-  var exp = new BN(this.number).idivn(100000).isubn(2)
+  var exp = num.idivn(100000).isubn(2)
   if (!exp.isNeg()) {
     dif.iadd(new BN(2).pow(exp))
   }
@@ -231,20 +229,3 @@ BlockHeader.prototype.isGenesis = function () {
   return this.number.toString('hex') === ''
 }
 
-/**
- * Determines if a given block part of homestead or not
- * @method isHomestead
- * @return Boolean
- */
-BlockHeader.prototype.isHomestead = function () {
-  return utils.bufferToInt(this.number) >= params.homeSteadForkNumber.v
-}
-
-/**
- * Determines if a given block part of Homestead Reprice (EIP150) or not
- * @method isHomesteadReprice
- * @return Boolean
- */
-BlockHeader.prototype.isHomesteadReprice = function () {
-  return utils.bufferToInt(this.number) >= params.homesteadRepriceForkNumber.v
-}

index.js

@@ -53,11 +53,10 @@ var Block = module.exports = function (data) {
     this.uncleHeaders.push(new BlockHeader(rawUncleHeaders[i]))
   }
 
-  var homestead = this.isHomestead()
   // parse transactions
   for (i = 0; i < rawTransactions.length; i++) {
     var tx = new Tx(rawTransactions[i])
-    tx._homestead = homestead
+    tx._homestead = true
     this.transactions.push(tx)
   }
 }
@@ -81,24 +80,6 @@ Block.prototype.isGenesis = function () {
   return this.header.isGenesis()
 }
 
-/**
- * Determines if a given block part of homestead or not
- * @method isHomestead
- * @return Boolean
- */
-Block.prototype.isHomestead = function () {
-  return this.header.isHomestead()
-}
-
-/**
- * Determines if a given block part of homestead reprice or not
- * @method isHomesteadReprice
- * @return Boolean
- */
-Block.prototype.isHomesteadReprice = function () {
-  return this.header.isHomesteadReprice()
-}
-
 /**
  * turns the block in to the canonical genesis block
  * @method setGenesisParams

tests/difficulty.js

@@ -1,4 +1,4 @@
-const testing = require('ethereumjs-testing')
+// const testing = require('ethereumjs-testing')
 const utils = require('ethereumjs-util')
 const tape = require('tape')
 const Block = require('../')
@@ -13,32 +13,43 @@ function normalize (data) {
 }
 
 tape('[Header]: difficulty tests', t => {
-  let args = {}
-  args.file = /^difficultyHomestead/
-  testing.getTestsFromArgs('BasicTests', (fileName, testName, test) => {
-    return new Promise((resolve, reject) => {
-      normalize(test)
+  function runDifficultyTests (test) {
+    normalize(test)
 
-      var parentBlock = new Block()
-      parentBlock.header.timestamp = test.parentTimestamp
-      parentBlock.header.difficulty = test.parentDifficulty
+    var parentBlock = new Block()
+    parentBlock.header.timestamp = test.parentTimestamp
+    parentBlock.header.difficulty = test.parentDifficulty
+    parentBlock.header.uncleHash = test.parentUncles
 
-      var block = new Block()
-      block.header.isHomestead = function () {
-        return true
-      }
+    var block = new Block()
+    block.header.timestamp = test.currentTimestamp
+    block.header.difficulty = test.currentDifficulty
+    block.header.number = test.currentBlockNumber
 
-      block.header.timestamp = test.currentTimestamp
-      block.header.difficulty = test.currentDifficulty
-      block.header.number = test.currentBlockNumber
+    var dif = block.header.canonicalDifficulty(parentBlock)
+    t.equal(dif.toString(), test.currentDifficulty.toString(), 'test canonicalDifficulty')
+    t.assert(block.header.validateDifficulty(parentBlock), 'test validateDifficulty')
+  }
 
-      var dif = block.header.canonicalDifficulty(parentBlock)
-      t.equal(dif.toString(), test.currentDifficulty.toString(), 'test canonicalDifficulty')
-      t.assert(block.header.validateDifficulty(parentBlock), 'test validateDifficulty')
+  const testData = require('./testdata-difficulty.json')
+  for (let testName in testData) {
+    runDifficultyTests(testData[testName])
+  }
+  t.end()
 
+  // Temporarily run local test selection
+  // also: implicit testing through ethereumjs-vm tests
+  // (no Byzantium difficulty tests available yet)
+  /*
+  let args = {}
+  args.file = /^difficultyHomestead/
+  testing.getTestsFromArgs('BasicTests', (fileName, testName, test) => {
+    return new Promise((resolve, reject) => {
+      runDifficultyTests(test)
       resolve()
     }).catch(err => console.log(err))
   }, args).then(() => {
     t.end()
   })
+  */
 })