core: ValidatedHeader (method => function)

Changed header validation method to function in preparation of
@karalabe's PR.

core/block_processor.go

@@ -185,7 +185,7 @@ func (sm *BlockProcessor) processWithParent(block, parent *types.Block) (logs st
 	state := state.New(parent.Root(), sm.db)
 
 	// Block validation
-	if err = sm.ValidateHeader(block.Header(), parent.Header(), false); err != nil {
+	if err = ValidateHeader(sm.Pow, block.Header(), parent.Header(), false); err != nil {
 		return
 	}
 
@@ -260,67 +260,6 @@ func (sm *BlockProcessor) processWithParent(block, parent *types.Block) (logs st
 	return state.Logs(), nil
 }
 
-// See YP section 4.3.4. "Block Header Validity"
-// Validates a block. Returns an error if the block is invalid.
-func (sm *BlockProcessor) ValidateHeader(block, parent *types.Header, checkPow bool) error {
-	if big.NewInt(int64(len(block.Extra))).Cmp(params.MaximumExtraDataSize) == 1 {
-		return fmt.Errorf("Block extra data too long (%d)", len(block.Extra))
-	}
-
-	expd := CalcDifficulty(block, parent)
-	if expd.Cmp(block.Difficulty) != 0 {
-		return fmt.Errorf("Difficulty check failed for block %v, %v", block.Difficulty, expd)
-	}
-
-	a := new(big.Int).Sub(block.GasLimit, parent.GasLimit)
-	a.Abs(a)
-	b := new(big.Int).Div(parent.GasLimit, params.GasLimitBoundDivisor)
-	if !(a.Cmp(b) < 0) || (block.GasLimit.Cmp(params.MinGasLimit) == -1) {
-		return fmt.Errorf("GasLimit check failed for block %v (%v > %v)", block.GasLimit, a, b)
-	}
-
-	if int64(block.Time) > time.Now().Unix() {
-		return BlockFutureErr
-	}
-
-	if new(big.Int).Sub(block.Number, parent.Number).Cmp(big.NewInt(1)) != 0 {
-		return BlockNumberErr
-	}
-
-	if block.Time <= parent.Time {
-		return BlockEqualTSErr //ValidationError("Block timestamp equal or less than previous block (%v - %v)", block.Time, parent.Time)
-	}
-
-	if checkPow {
-		// Verify the nonce of the block. Return an error if it's not valid
-		if !sm.Pow.Verify(types.NewBlockWithHeader(block)) {
-			return ValidationError("Block's nonce is invalid (= %x)", block.Nonce)
-		}
-	}
-
-	return nil
-}
-
-func AccumulateRewards(statedb *state.StateDB, block *types.Block) {
-	reward := new(big.Int).Set(BlockReward)
-
-	for _, uncle := range block.Uncles() {
-		num := new(big.Int).Add(big.NewInt(8), uncle.Number)
-		num.Sub(num, block.Number())
-
-		r := new(big.Int)
-		r.Mul(BlockReward, num)
-		r.Div(r, big.NewInt(8))
-
-		statedb.AddBalance(uncle.Coinbase, r)
-
-		reward.Add(reward, new(big.Int).Div(BlockReward, big.NewInt(32)))
-	}
-
-	// Get the account associated with the coinbase
-	statedb.AddBalance(block.Header().Coinbase, reward)
-}
-
 func (sm *BlockProcessor) VerifyUncles(statedb *state.StateDB, block, parent *types.Block) error {
 	ancestors := set.New()
 	uncles := set.New()
@@ -358,7 +297,7 @@ func (sm *BlockProcessor) VerifyUncles(statedb *state.StateDB, block, parent *ty
 			return UncleError("uncle[%d](%x)'s parent is not ancestor (%x)", i, hash[:4], uncle.ParentHash[0:4])
 		}
 
-		if err := sm.ValidateHeader(uncle, ancestorHeaders[uncle.ParentHash], true); err != nil {
+		if err := ValidateHeader(sm.Pow, uncle, ancestorHeaders[uncle.ParentHash], true); err != nil {
 			return ValidationError(fmt.Sprintf("uncle[%d](%x) header invalid: %v", i, hash[:4], err))
 		}
 	}
@@ -395,6 +334,67 @@ func (sm *BlockProcessor) GetLogs(block *types.Block) (logs state.Logs, err erro
 	return state.Logs(), nil
 }
 
+// See YP section 4.3.4. "Block Header Validity"
+// Validates a block. Returns an error if the block is invalid.
+func ValidateHeader(pow pow.PoW, block, parent *types.Header, checkPow bool) error {
+	if big.NewInt(int64(len(block.Extra))).Cmp(params.MaximumExtraDataSize) == 1 {
+		return fmt.Errorf("Block extra data too long (%d)", len(block.Extra))
+	}
+
+	expd := CalcDifficulty(block, parent)
+	if expd.Cmp(block.Difficulty) != 0 {
+		return fmt.Errorf("Difficulty check failed for block %v, %v", block.Difficulty, expd)
+	}
+
+	a := new(big.Int).Sub(block.GasLimit, parent.GasLimit)
+	a.Abs(a)
+	b := new(big.Int).Div(parent.GasLimit, params.GasLimitBoundDivisor)
+	if !(a.Cmp(b) < 0) || (block.GasLimit.Cmp(params.MinGasLimit) == -1) {
+		return fmt.Errorf("GasLimit check failed for block %v (%v > %v)", block.GasLimit, a, b)
+	}
+
+	if int64(block.Time) > time.Now().Unix() {
+		return BlockFutureErr
+	}
+
+	if new(big.Int).Sub(block.Number, parent.Number).Cmp(big.NewInt(1)) != 0 {
+		return BlockNumberErr
+	}
+
+	if block.Time <= parent.Time {
+		return BlockEqualTSErr //ValidationError("Block timestamp equal or less than previous block (%v - %v)", block.Time, parent.Time)
+	}
+
+	if checkPow {
+		// Verify the nonce of the block. Return an error if it's not valid
+		if !pow.Verify(types.NewBlockWithHeader(block)) {
+			return ValidationError("Block's nonce is invalid (= %x)", block.Nonce)
+		}
+	}
+
+	return nil
+}
+
+func AccumulateRewards(statedb *state.StateDB, block *types.Block) {
+	reward := new(big.Int).Set(BlockReward)
+
+	for _, uncle := range block.Uncles() {
+		num := new(big.Int).Add(big.NewInt(8), uncle.Number)
+		num.Sub(num, block.Number())
+
+		r := new(big.Int)
+		r.Mul(BlockReward, num)
+		r.Div(r, big.NewInt(8))
+
+		statedb.AddBalance(uncle.Coinbase, r)
+
+		reward.Add(reward, new(big.Int).Div(BlockReward, big.NewInt(32)))
+	}
+
+	// Get the account associated with the coinbase
+	statedb.AddBalance(block.Header().Coinbase, reward)
+}
+
 func getBlockReceipts(db common.Database, bhash common.Hash) (receipts types.Receipts, err error) {
 	var rdata []byte
 	rdata, err = db.Get(append(receiptsPre, bhash[:]...))

core/block_processor_test.go

@@ -26,18 +26,20 @@ func proc() (*BlockProcessor, *ChainManager) {
 }
 
 func TestNumber(t *testing.T) {
-	bp, chain := proc()
+	_, chain := proc()
 	block1 := chain.NewBlock(common.Address{})
 	block1.Header().Number = big.NewInt(3)
 	block1.Header().Time--
 
-	err := bp.ValidateHeader(block1.Header(), chain.Genesis().Header(), false)
+	pow := ezp.New()
+
+	err := ValidateHeader(pow, block1.Header(), chain.Genesis().Header(), false)
 	if err != BlockNumberErr {
 		t.Errorf("expected block number error %v", err)
 	}
 
 	block1 = chain.NewBlock(common.Address{})
-	err = bp.ValidateHeader(block1.Header(), chain.Genesis().Header(), false)
+	err = ValidateHeader(pow, block1.Header(), chain.Genesis().Header(), false)
 	if err == BlockNumberErr {
 		t.Errorf("didn't expect block number error")
 	}