Use uint64 for block header timestamp

cmd/evm/main.go

@@ -106,7 +106,7 @@ type VMEnv struct {
 
 	depth int
 	Gas   *big.Int
-	time  int64
+	time  uint64
 	logs  []vm.StructLog
 }
 
@@ -115,7 +115,7 @@ func NewEnv(state *state.StateDB, transactor common.Address, value *big.Int) *VM
 		state:      state,
 		transactor: &transactor,
 		value:      value,
-		time:       time.Now().Unix(),
+		time:       uint64(time.Now().Unix()),
 	}
 }
 
@@ -123,7 +123,7 @@ func (self *VMEnv) State() *state.StateDB    { return self.state }
 func (self *VMEnv) Origin() common.Address   { return *self.transactor }
 func (self *VMEnv) BlockNumber() *big.Int    { return common.Big0 }
 func (self *VMEnv) Coinbase() common.Address { return *self.transactor }
-func (self *VMEnv) Time() int64              { return self.time }
+func (self *VMEnv) Time() uint64             { return self.time }
 func (self *VMEnv) Difficulty() *big.Int     { return common.Big1 }
 func (self *VMEnv) BlockHash() []byte        { return make([]byte, 32) }
 func (self *VMEnv) Value() *big.Int          { return self.value }

core/block_processor.go

@@ -362,6 +362,13 @@ func ValidateHeader(pow pow.PoW, block *types.Header, parent *types.Block, check
 		return fmt.Errorf("Block extra data too long (%d)", len(block.Extra))
 	}
 
+	if block.Time > uint64(time.Now().Unix()) {
+		return BlockFutureErr
+	}
+	if block.Time <= parent.Time() {
+		return BlockEqualTSErr
+	}
+
 	expd := CalcDifficulty(int64(block.Time), int64(parent.Time()), parent.Difficulty())
 	if expd.Cmp(block.Difficulty) != 0 {
 		return fmt.Errorf("Difficulty check failed for block %v, %v", block.Difficulty, expd)
@@ -377,20 +384,12 @@ func ValidateHeader(pow pow.PoW, block *types.Header, parent *types.Block, check
 		return fmt.Errorf("GasLimit check failed for block %v (%v > %v)", block.GasLimit, a, b)
 	}
 
-	if int64(block.Time) > time.Now().Unix() {
-		return BlockFutureErr
-	}
-
 	num := parent.Number()
 	num.Sub(block.Number, num)
 	if num.Cmp(big.NewInt(1)) != 0 {
 		return BlockNumberErr
 	}
 
-	if block.Time <= uint64(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)) {

core/chain_makers.go

@@ -155,7 +155,7 @@ func makeHeader(parent *types.Block, state *state.StateDB) *types.Header {
 		Root:       state.Root(),
 		ParentHash: parent.Hash(),
 		Coinbase:   parent.Coinbase(),
-		Difficulty: CalcDifficulty(time, parent.Time(), parent.Difficulty()),
+		Difficulty: CalcDifficulty(int64(time), int64(parent.Time()), parent.Difficulty()),
 		GasLimit:   CalcGasLimit(parent),
 		GasUsed:    new(big.Int),
 		Number:     new(big.Int).Add(parent.Number(), common.Big1),

core/chain_manager.go

@@ -658,7 +658,7 @@ func (self *ChainManager) InsertChain(chain types.Blocks) (int, error) {
 				// Allow up to MaxFuture second in the future blocks. If this limit
 				// is exceeded the chain is discarded and processed at a later time
 				// if given.
-				if max := time.Now().Unix() + maxTimeFutureBlocks; block.Time() > max {
+				if max := time.Now().Unix() + maxTimeFutureBlocks; int64(block.Time()) > max {
 					return i, fmt.Errorf("%v: BlockFutureErr, %v > %v", BlockFutureErr, block.Time(), max)
 				}
 

core/types/block.go

@@ -290,7 +290,7 @@ func (b *Block) MixDigest() common.Hash   { return b.header.MixDigest }
 func (b *Block) Nonce() uint64            { return binary.BigEndian.Uint64(b.header.Nonce[:]) }
 func (b *Block) Bloom() Bloom             { return b.header.Bloom }
 func (b *Block) Coinbase() common.Address { return b.header.Coinbase }
-func (b *Block) Time() int64              { return int64(b.header.Time) }
+func (b *Block) Time() uint64             { return b.header.Time }
 func (b *Block) Root() common.Hash        { return b.header.Root }
 func (b *Block) ParentHash() common.Hash  { return b.header.ParentHash }
 func (b *Block) TxHash() common.Hash      { return b.header.TxHash }

core/types/block_test.go

@@ -31,7 +31,7 @@ func TestBlockEncoding(t *testing.T) {
 	check("Root", block.Root(), common.HexToHash("ef1552a40b7165c3cd773806b9e0c165b75356e0314bf0706f279c729f51e017"))
 	check("Hash", block.Hash(), common.HexToHash("0a5843ac1cb04865017cb35a57b50b07084e5fcee39b5acadade33149f4fff9e"))
 	check("Nonce", block.Nonce(), uint64(0xa13a5a8c8f2bb1c4))
-	check("Time", block.Time(), int64(1426516743))
+	check("Time", block.Time(), uint64(1426516743))
 	check("Size", block.Size(), common.StorageSize(len(blockEnc)))
 
 	tx1 := NewTransaction(0, common.HexToAddress("095e7baea6a6c7c4c2dfeb977efac326af552d87"), big.NewInt(10), big.NewInt(50000), big.NewInt(10), nil)

core/vm/environment.go

@@ -17,7 +17,7 @@ type Environment interface {
 	BlockNumber() *big.Int
 	GetHash(n uint64) common.Hash
 	Coinbase() common.Address
-	Time() int64
+	Time() uint64
 	Difficulty() *big.Int
 	GasLimit() *big.Int
 	Transfer(from, to Account, amount *big.Int) error

core/vm/vm.go

@@ -444,7 +444,7 @@ func (self *Vm) Run(context *Context, input []byte) (ret []byte, err error) {
 		case TIMESTAMP:
 			time := self.env.Time()
 
-			stack.push(big.NewInt(time))
+			stack.push(new(big.Int).SetUint64(time))
 
 		case NUMBER:
 			number := self.env.BlockNumber()

core/vm_env.go

@@ -33,7 +33,7 @@ func NewEnv(state *state.StateDB, chain *ChainManager, msg Message, header *type
 func (self *VMEnv) Origin() common.Address   { f, _ := self.msg.From(); return f }
 func (self *VMEnv) BlockNumber() *big.Int    { return self.header.Number }
 func (self *VMEnv) Coinbase() common.Address { return self.header.Coinbase }
-func (self *VMEnv) Time() int64              { return int64(self.header.Time) }
+func (self *VMEnv) Time() uint64             { return self.header.Time }
 func (self *VMEnv) Difficulty() *big.Int     { return self.header.Difficulty }
 func (self *VMEnv) GasLimit() *big.Int       { return self.header.GasLimit }
 func (self *VMEnv) Value() *big.Int          { return self.msg.Value() }

miner/worker.go

@@ -368,8 +368,8 @@ func (self *worker) commitNewWork() {
 	tstart := time.Now()
 	parent := self.chain.CurrentBlock()
 	tstamp := tstart.Unix()
-	if tstamp <= parent.Time() {
+	if tstamp <= int64(parent.Time()) {
-		tstamp = parent.Time() + 1
+		tstamp = int64(parent.Time()) + 1
 	}
 	// this will ensure we're not going off too far in the future
 	if now := time.Now().Unix(); tstamp > now+4 {
@@ -382,7 +382,7 @@ func (self *worker) commitNewWork() {
 	header := &types.Header{
 		ParentHash: parent.Hash(),
 		Number:     num.Add(num, common.Big1),
-		Difficulty: core.CalcDifficulty(tstamp, parent.Time(), parent.Difficulty()),
+		Difficulty: core.CalcDifficulty(int64(tstamp), int64(parent.Time()), parent.Difficulty()),
 		GasLimit:   core.CalcGasLimit(parent),
 		GasUsed:    new(big.Int),
 		Coinbase:   self.coinbase,

tests/util.go

@@ -120,7 +120,7 @@ type Env struct {
 	coinbase common.Address
 
 	number     *big.Int
-	time       int64
+	time       uint64
 	difficulty *big.Int
 	gasLimit   *big.Int
 
@@ -150,7 +150,7 @@ func NewEnvFromMap(state *state.StateDB, envValues map[string]string, exeValues
 	//env.parent = common.Hex2Bytes(envValues["previousHash"])
 	env.coinbase = common.HexToAddress(envValues["currentCoinbase"])
 	env.number = common.Big(envValues["currentNumber"])
-	env.time = common.Big(envValues["currentTimestamp"]).Int64()
+	env.time = common.Big(envValues["currentTimestamp"]).Uint64()
 	env.difficulty = common.Big(envValues["currentDifficulty"])
 	env.gasLimit = common.Big(envValues["currentGasLimit"])
 	env.Gas = new(big.Int)
@@ -163,7 +163,7 @@ func (self *Env) BlockNumber() *big.Int  { return self.number }
 
 //func (self *Env) PrevHash() []byte      { return self.parent }
 func (self *Env) Coinbase() common.Address { return self.coinbase }
-func (self *Env) Time() int64              { return self.time }
+func (self *Env) Time() uint64             { return self.time }
 func (self *Env) Difficulty() *big.Int     { return self.difficulty }
 func (self *Env) State() *state.StateDB    { return self.state }
 func (self *Env) GasLimit() *big.Int       { return self.gasLimit }

xeth/types.go

@@ -60,7 +60,7 @@ type Block struct {
 	Hash         string       `json:"hash"`
 	Transactions *common.List `json:"transactions"`
 	Uncles       *common.List `json:"uncles"`
-	Time         int64        `json:"time"`
+	Time         uint64       `json:"time"`
 	Coinbase     string       `json:"coinbase"`
 	Name         string       `json:"name"`
 	GasLimit     string       `json:"gasLimit"`