Golang Header.Hash方法代碼示例

// SetCurrentHeader sets the current head header of the canonical chain.
func (hc *HeaderChain) SetCurrentHeader(head *types.Header) {
	if err := WriteHeadHeaderHash(hc.chainDb, head.Hash()); err != nil {
		glog.Fatalf("failed to insert head header hash: %v", err)
	}
	hc.currentHeader = head
	hc.currentHeaderHash = head.Hash()
}

// WriteHeader writes a header into the local chain, given that its parent is
// already known. If the total difficulty of the newly inserted header becomes
// greater than the current known TD, the canonical chain is re-routed.
//
// Note: This method is not concurrent-safe with inserting blocks simultaneously
// into the chain, as side effects caused by reorganisations cannot be emulated
// without the real blocks. Hence, writing headers directly should only be done
// in two scenarios: pure-header mode of operation (light clients), or properly
// separated header/block phases (non-archive clients).
func (hc *HeaderChain) WriteHeader(header *types.Header) (status WriteStatus, err error) {
	// Cache some values to prevent constant recalculation
	var (
		hash   = header.Hash()
		number = header.Number.Uint64()
	)
	// Calculate the total difficulty of the header
	ptd := hc.GetTd(header.ParentHash)
	if ptd == nil {
		return NonStatTy, ParentError(header.ParentHash)
	}
	localTd := hc.GetTd(hc.currentHeaderHash)
	externTd := new(big.Int).Add(header.Difficulty, ptd)

	// If the total difficulty is higher than our known, add it to the canonical chain
	// Second clause in the if statement reduces the vulnerability to selfish mining.
	// Please refer to http://www.cs.cornell.edu/~ie53/publications/btcProcFC.pdf
	if externTd.Cmp(localTd) > 0 || (externTd.Cmp(localTd) == 0 && mrand.Float64() < 0.5) {
		// Delete any canonical number assignments above the new head
		for i := number + 1; GetCanonicalHash(hc.chainDb, i) != (common.Hash{}); i++ {
			DeleteCanonicalHash(hc.chainDb, i)
		}
		// Overwrite any stale canonical number assignments
		var (
			headHash   = header.ParentHash
			headHeader = hc.GetHeader(headHash)
			headNumber = headHeader.Number.Uint64()
		)
		for GetCanonicalHash(hc.chainDb, headNumber) != headHash {
			WriteCanonicalHash(hc.chainDb, headHash, headNumber)

			headHash = headHeader.ParentHash
			headHeader = hc.GetHeader(headHash)
			headNumber = headHeader.Number.Uint64()
		}
		// Extend the canonical chain with the new header
		if err := WriteCanonicalHash(hc.chainDb, hash, number); err != nil {
			glog.Fatalf("failed to insert header number: %v", err)
		}
		if err := WriteHeadHeaderHash(hc.chainDb, hash); err != nil {
			glog.Fatalf("failed to insert head header hash: %v", err)
		}
		hc.currentHeaderHash, hc.currentHeader = hash, types.CopyHeader(header)

		status = CanonStatTy
	} else {
		status = SideStatTy
	}
	// Irrelevant of the canonical status, write the header itself to the database
	if err := hc.WriteTd(hash, externTd); err != nil {
		glog.Fatalf("failed to write header total difficulty: %v", err)
	}
	if err := WriteHeader(hc.chainDb, header); err != nil {
		glog.Fatalf("failed to write header contents: %v", err)
	}
	hc.headerCache.Add(hash, header)

	return
}

// ValidateHeader validates the given header and, depending on the pow arg,
// checks the proof of work of the given header. Returns an error if the
// validation failed.
func (v *BlockValidator) ValidateHeader(header, parent *types.Header, checkPow bool) error {
	// Short circuit if the parent is missing.
	if parent == nil {
		return ParentError(header.ParentHash)
	}
	// Short circuit if the header's already known or its parent missing
	if v.bc.HasHeader(header.Hash()) {
		return nil
	}
	return ValidateHeader(v.config, v.Pow, header, parent, checkPow, false)
}

// ValidateHeader verifies the validity of a header, relying on the database and
// POW behind the block processor.
func (sm *BlockProcessor) ValidateHeader(header *types.Header, checkPow, uncle bool) error {
	// Short circuit if the header's already known or its parent missing
	if sm.bc.HasHeader(header.Hash()) {
		return nil
	}
	if parent := sm.bc.GetHeader(header.ParentHash); parent == nil {
		return ParentError(header.ParentHash)
	} else {
		return ValidateHeader(sm.Pow, header, parent, checkPow, uncle)
	}
}

// WriteHeader serializes a block header into the database.
func WriteHeader(db ethdb.Database, header *types.Header) error {
	data, err := rlp.EncodeToBytes(header)
	if err != nil {
		return err
	}
	key := append(append(blockPrefix, header.Hash().Bytes()...), headerSuffix...)
	if err := db.Put(key, data); err != nil {
		glog.Fatalf("failed to store header into database: %v", err)
		return err
	}
	glog.V(logger.Debug).Infof("stored header #%v [%x…]", header.Number, header.Hash().Bytes()[:4])
	return nil
}

func (self *worker) commitUncle(work *Work, uncle *types.Header) error {
	hash := uncle.Hash()
	if work.uncles.Has(hash) {
		return core.UncleError("Uncle not unique")
	}
	if !work.ancestors.Has(uncle.ParentHash) {
		return core.UncleError(fmt.Sprintf("Uncle's parent unknown (%x)", uncle.ParentHash[0:4]))
	}
	if work.family.Has(hash) {
		return core.UncleError(fmt.Sprintf("Uncle already in family (%x)", hash))
	}
	work.uncles.Add(uncle.Hash())
	return nil
}

// Validates a header. Returns an error if the header is invalid.
//
// See YP section 4.3.4. "Block Header Validity"
func ValidateHeader(config *ChainConfig, pow pow.PoW, header *types.Header, parent *types.Header, checkPow, uncle bool) error {
	if big.NewInt(int64(len(header.Extra))).Cmp(params.MaximumExtraDataSize) == 1 {
		return fmt.Errorf("Header extra data too long (%d)", len(header.Extra))
	}

	if uncle {
		if header.Time.Cmp(common.MaxBig) == 1 {
			return BlockTSTooBigErr
		}
	} else {
		if header.Time.Cmp(big.NewInt(time.Now().Unix())) == 1 {
			return BlockFutureErr
		}
	}
	if header.Time.Cmp(parent.Time) != 1 {
		return BlockEqualTSErr
	}

	expd := CalcDifficulty(config, header.Time.Uint64(), parent.Time.Uint64(), parent.Number, parent.Difficulty)
	if expd.Cmp(header.Difficulty) != 0 {
		return fmt.Errorf("Difficulty check failed for header %v, %v", header.Difficulty, expd)
	}

	a := new(big.Int).Set(parent.GasLimit)
	a = a.Sub(a, header.GasLimit)
	a.Abs(a)
	b := new(big.Int).Set(parent.GasLimit)
	b = b.Div(b, params.GasLimitBoundDivisor)
	if !(a.Cmp(b) < 0) || (header.GasLimit.Cmp(params.MinGasLimit) == -1) {
		return fmt.Errorf("GasLimit check failed for header %v (%v > %v)", header.GasLimit, a, b)
	}

	num := new(big.Int).Set(parent.Number)
	num.Sub(header.Number, num)
	if num.Cmp(big.NewInt(1)) != 0 {
		return BlockNumberErr
	}

	if checkPow {
		// Verify the nonce of the header. Return an error if it's not valid
		if !pow.Verify(types.NewBlockWithHeader(header)) {
			return &BlockNonceErr{header.Number, header.Hash(), header.Nonce.Uint64()}
		}
	}
	// If all checks passed, validate the extra-data field for hard forks
	return ValidateDAOHeaderExtraData(config, header)
}

func (self *worker) commitUncle(uncle *types.Header) error {
	if self.current.uncles.Has(uncle.Hash()) {
		// Error not unique
		return core.UncleError("Uncle not unique")
	}
	self.current.uncles.Add(uncle.Hash())

	if !self.current.family.Has(uncle.ParentHash) {
		return core.UncleError(fmt.Sprintf("Uncle's parent unknown (%x)", uncle.ParentHash[0:4]))
	}

	if self.current.family.Has(uncle.Hash()) {
		return core.UncleError(fmt.Sprintf("Uncle already in family (%x)", uncle.Hash()))
	}

	return nil
}

func NewUncleRes(h *types.Header) *UncleRes {
	if h == nil {
		return nil
	}

	var v = new(UncleRes)
	v.BlockNumber = newHexNum(h.Number)
	v.BlockHash = newHexData(h.Hash())
	v.ParentHash = newHexData(h.ParentHash)
	v.Sha3Uncles = newHexData(h.UncleHash)
	v.Nonce = newHexData(h.Nonce[:])
	v.LogsBloom = newHexData(h.Bloom)
	v.TransactionRoot = newHexData(h.TxHash)
	v.StateRoot = newHexData(h.Root)
	v.Miner = newHexData(h.Coinbase)
	v.Difficulty = newHexNum(h.Difficulty)
	v.ExtraData = newHexData(h.Extra)
	v.GasLimit = newHexNum(h.GasLimit)
	v.GasUsed = newHexNum(h.GasUsed)
	v.UnixTimestamp = newHexNum(h.Time)
	v.ReceiptHash = newHexData(h.ReceiptHash)

	return v
}

// writeHeader writes a header into the local chain, given that its parent is
// already known. If the total difficulty of the newly inserted header becomes
// greater than the current known TD, the canonical chain is re-routed.
//
// Note: This method is not concurrent-safe with inserting blocks simultaneously
// into the chain, as side effects caused by reorganisations cannot be emulated
// without the real blocks. Hence, writing headers directly should only be done
// in two scenarios: pure-header mode of operation (light clients), or properly
// separated header/block phases (non-archive clients).
func (self *BlockChain) writeHeader(header *types.Header) error {
	self.wg.Add(1)
	defer self.wg.Done()

	// Calculate the total difficulty of the header
	ptd := self.GetTd(header.ParentHash)
	if ptd == nil {
		return ParentError(header.ParentHash)
	}

	localTd := self.GetTd(self.currentHeader.Hash())
	externTd := new(big.Int).Add(header.Difficulty, ptd)

	// Make sure no inconsistent state is leaked during insertion
	self.mu.Lock()
	defer self.mu.Unlock()

	// If the total difficulty is higher than our known, add it to the canonical chain
	// Second clause in the if statement reduces the vulnerability to selfish mining.
	// Please refer to http://www.cs.cornell.edu/~ie53/publications/btcProcFC.pdf
	if externTd.Cmp(localTd) > 0 || (externTd.Cmp(localTd) == 0 && mrand.Float64() < 0.5) {
		// Delete any canonical number assignments above the new head
		for i := header.Number.Uint64() + 1; GetCanonicalHash(self.chainDb, i) != (common.Hash{}); i++ {
			DeleteCanonicalHash(self.chainDb, i)
		}
		// Overwrite any stale canonical number assignments
		head := self.GetHeader(header.ParentHash)
		for GetCanonicalHash(self.chainDb, head.Number.Uint64()) != head.Hash() {
			WriteCanonicalHash(self.chainDb, head.Hash(), head.Number.Uint64())
			head = self.GetHeader(head.ParentHash)
		}
		// Extend the canonical chain with the new header
		if err := WriteCanonicalHash(self.chainDb, header.Hash(), header.Number.Uint64()); err != nil {
			glog.Fatalf("failed to insert header number: %v", err)
		}
		if err := WriteHeadHeaderHash(self.chainDb, header.Hash()); err != nil {
			glog.Fatalf("failed to insert head header hash: %v", err)
		}
		self.currentHeader = types.CopyHeader(header)
	}
	// Irrelevant of the canonical status, write the header itself to the database
	if err := WriteTd(self.chainDb, header.Hash(), externTd); err != nil {
		glog.Fatalf("failed to write header total difficulty: %v", err)
	}
	if err := WriteHeader(self.chainDb, header); err != nil {
		glog.Fatalf("filed to write header contents: %v", err)
	}
	return nil
}

// writeHeader writes a header into the local chain, given that its parent is
// already known. If the total difficulty of the newly inserted header becomes
// greater than the current known TD, the canonical chain is re-routed.
//
// Note: This method is not concurrent-safe with inserting blocks simultaneously
// into the chain, as side effects caused by reorganisations cannot be emulated
// without the real blocks. Hence, writing headers directly should only be done
// in two scenarios: pure-header mode of operation (light clients), or properly
// separated header/block phases (non-archive clients).
func (self *BlockChain) writeHeader(header *types.Header) error {
	self.wg.Add(1)
	defer self.wg.Done()

	// Calculate the total difficulty of the header
	ptd := self.GetTd(header.ParentHash)
	if ptd == nil {
		return ParentError(header.ParentHash)
	}
	td := new(big.Int).Add(header.Difficulty, ptd)

	// Make sure no inconsistent state is leaked during insertion
	self.mu.Lock()
	defer self.mu.Unlock()

	// If the total difficulty is higher than our known, add it to the canonical chain
	if td.Cmp(self.GetTd(self.currentHeader.Hash())) > 0 {
		// Delete any canonical number assignments above the new head
		for i := header.Number.Uint64() + 1; GetCanonicalHash(self.chainDb, i) != (common.Hash{}); i++ {
			DeleteCanonicalHash(self.chainDb, i)
		}
		// Overwrite any stale canonical number assignments
		head := self.GetHeader(header.ParentHash)
		for GetCanonicalHash(self.chainDb, head.Number.Uint64()) != head.Hash() {
			WriteCanonicalHash(self.chainDb, head.Hash(), head.Number.Uint64())
			head = self.GetHeader(head.ParentHash)
		}
		// Extend the canonical chain with the new header
		if err := WriteCanonicalHash(self.chainDb, header.Hash(), header.Number.Uint64()); err != nil {
			glog.Fatalf("failed to insert header number: %v", err)
		}
		if err := WriteHeadHeaderHash(self.chainDb, header.Hash()); err != nil {
			glog.Fatalf("failed to insert head header hash: %v", err)
		}
		self.currentHeader = types.CopyHeader(header)
	}
	// Irrelevant of the canonical status, write the header itself to the database
	if err := WriteTd(self.chainDb, header.Hash(), td); err != nil {
		glog.Fatalf("failed to write header total difficulty: %v", err)
	}
	if err := WriteHeader(self.chainDb, header); err != nil {
		glog.Fatalf("filed to write header contents: %v", err)
	}
	return nil
}

// ValidateHeaderWithParent verifies the validity of a header, relying on the database and
// POW behind the block processor.
func (sm *BlockProcessor) ValidateHeaderWithParent(header, parent *types.Header, checkPow, uncle bool) error {
	if sm.bc.HasHeader(header.Hash()) {
		return nil
	}
	return ValidateHeader(sm.Pow, header, parent, checkPow, uncle)
}