Golang Block.Bits方法代码示例

func chkblock(bl *btc.Block) (er error) {
	// Check timestamp (must not be higher than now +2 hours)
	if int64(bl.BlockTime()) > time.Now().Unix()+2*60*60 {
		er = errors.New("CheckBlock() : block timestamp too far in the future")
		return
	}

	MemBlockChainMutex.Lock()
	if prv, pres := MemBlockChain.BlockIndex[bl.Hash.BIdx()]; pres {
		MemBlockChainMutex.Unlock()
		if prv.Parent == nil {
			// This is genesis block
			er = errors.New("Genesis")
			return
		} else {
			return
		}
	}

	prevblk, ok := MemBlockChain.BlockIndex[btc.NewUint256(bl.ParentHash()).BIdx()]
	if !ok {
		er = errors.New("CheckBlock: " + bl.Hash.String() + " parent not found")
		return
	}

	// Check proof of work
	gnwr := MemBlockChain.GetNextWorkRequired(prevblk, bl.BlockTime())
	if bl.Bits() != gnwr {
		if !Testnet || ((prevblk.Height+1)%2016) != 0 {
			MemBlockChainMutex.Unlock()
			er = errors.New(fmt.Sprint("CheckBlock: Incorrect proof of work at block", prevblk.Height+1))
			return
		}
	}

	cur := new(chain.BlockTreeNode)
	cur.BlockHash = bl.Hash
	cur.Parent = prevblk
	cur.Height = prevblk.Height + 1
	cur.TxCount = uint32(bl.TxCount)
	copy(cur.BlockHeader[:], bl.Raw[:80])
	prevblk.Childs = append(prevblk.Childs, cur)
	MemBlockChain.BlockIndex[cur.BlockHash.BIdx()] = cur
	MemBlockChainMutex.Unlock()

	LastBlock.Mutex.Lock()
	if cur.Height > LastBlock.node.Height {
		LastBlock.node = cur
	}
	LastBlock.Mutex.Unlock()

	return
}

func (ch *Chain) CheckBlock(bl *btc.Block) (er error, dos bool, maybelater bool) {
	// Size limits
	if len(bl.Raw) < 81 || len(bl.Raw) > btc.MAX_BLOCK_SIZE {
		er = errors.New("CheckBlock() : size limits failed")
		dos = true
		return
	}

	// Check timestamp (must not be higher than now +2 hours)
	if int64(bl.BlockTime()) > time.Now().Unix()+2*60*60 {
		er = errors.New("CheckBlock() : block timestamp too far in the future")
		dos = true
		return
	}

	if prv, pres := ch.BlockIndex[bl.Hash.BIdx()]; pres {
		if prv.Parent == nil {
			// This is genesis block
			er = errors.New("Genesis")
			return
		} else {
			er = errors.New("CheckBlock: " + bl.Hash.String() + " already in")
			return
		}
	}

	prevblk, ok := ch.BlockIndex[btc.NewUint256(bl.ParentHash()).BIdx()]
	if !ok {
		er = errors.New("CheckBlock: " + bl.Hash.String() + " parent not found")
		maybelater = true
		return
	}

	// Reject the block if it reaches into the chain deeper than our unwind buffer
	if prevblk != ch.BlockTreeEnd && int(ch.BlockTreeEnd.Height)-int(prevblk.Height+1) >= MovingCheckopintDepth {
		er = errors.New(fmt.Sprint("CheckBlock: btc.Block ", bl.Hash.String(),
			" hooks too deep into the chain: ", prevblk.Height+1, "/", ch.BlockTreeEnd.Height, " ",
			btc.NewUint256(bl.ParentHash()).String()))
		return
	}

	// Check proof of work
	gnwr := ch.GetNextWorkRequired(prevblk, bl.BlockTime())
	if bl.Bits() != gnwr {
		println("AcceptBlock() : incorrect proof of work ", bl.Bits, " at block", prevblk.Height+1,
			" exp:", gnwr)

		// Here is a "solution" for whatever shit there is in testnet3, that nobody can explain me:
		if !ch.testnet() || ((prevblk.Height+1)%2016) != 0 {
			er = errors.New("CheckBlock: incorrect proof of work")
			dos = true
			return
		}
	}

	if bl.Txs == nil {
		er = bl.BuildTxList()
		if er != nil {
			dos = true
			return
		}
	}

	if !bl.Trusted {
		// This is a stupid check, but well, we need to be satoshi compatible
		if len(bl.Txs) == 0 || !bl.Txs[0].IsCoinBase() {
			er = errors.New("CheckBlock() : first tx is not coinbase: " + bl.Hash.String())
			dos = true
			return
		}

		// Check Merkle Root - that's importnant
		if !bytes.Equal(btc.GetMerkel(bl.Txs), bl.MerkleRoot()) {
			er = errors.New("CheckBlock() : Merkle Root mismatch")
			dos = true
			return
		}

		// Check transactions - this is the most time consuming task
		for i := 0; i < len(bl.Txs); i++ {
			er = bl.Txs[i].CheckTransaction()
			if er != nil {
				er = errors.New("CheckBlock() : CheckTransaction failed: " + er.Error())
				dos = true
				return
			}
			if !bl.Txs[i].IsFinal(prevblk.Height+1, bl.BlockTime()) {
				er = errors.New("CheckBlock() : Contains transaction that is not final")
				return
			}
		}
	}

	return
}

func (ch *Chain) CheckBlock(bl *btc.Block) (er error, dos bool, maybelater bool) {
	// Size limits
	if len(bl.Raw) < 81 || len(bl.Raw) > btc.MAX_BLOCK_SIZE {
		er = errors.New("CheckBlock() : size limits failed")
		dos = true
		return
	}

	if bl.Version() == 0 {
		er = errors.New("CheckBlock() : Block version 0 not allowed")
		dos = true
		return
	}

	// Check timestamp (must not be higher than now +2 hours)
	if int64(bl.BlockTime()) > time.Now().Unix()+2*60*60 {
		er = errors.New("CheckBlock() : block timestamp too far in the future")
		dos = true
		return
	}

	if prv, pres := ch.BlockIndex[bl.Hash.BIdx()]; pres {
		if prv.Parent == nil {
			// This is genesis block
			er = errors.New("Genesis")
			return
		} else {
			er = errors.New("CheckBlock: " + bl.Hash.String() + " already in")
			return
		}
	}

	prevblk, ok := ch.BlockIndex[btc.NewUint256(bl.ParentHash()).BIdx()]
	if !ok {
		er = errors.New("CheckBlock: " + bl.Hash.String() + " parent not found")
		maybelater = true
		return
	}

	height := prevblk.Height + 1

	// Reject the block if it reaches into the chain deeper than our unwind buffer
	if prevblk != ch.BlockTreeEnd && int(ch.BlockTreeEnd.Height)-int(height) >= MovingCheckopintDepth {
		er = errors.New(fmt.Sprint("CheckBlock: btc.Block ", bl.Hash.String(),
			" hooks too deep into the chain: ", height, "/", ch.BlockTreeEnd.Height, " ",
			btc.NewUint256(bl.ParentHash()).String()))
		return
	}

	// Check proof of work
	gnwr := ch.GetNextWorkRequired(prevblk, bl.BlockTime())
	if bl.Bits() != gnwr {
		println("AcceptBlock() : incorrect proof of work ", bl.Bits, " at block", height, " exp:", gnwr)

		// Here is a "solution" for whatever shit there is in testnet3, that nobody can explain me:
		if !ch.testnet() || (height%2016) != 0 {
			er = errors.New("CheckBlock: incorrect proof of work")
			dos = true
			return
		}
	}

	// Count block versions within the Majority Window
	var majority_v2, majority_v3 uint
	n := prevblk
	for cnt := uint(0); cnt < ch.Consensus.Window && n != nil; cnt++ {
		ver := binary.LittleEndian.Uint32(n.BlockHeader[0:4])
		if ver >= 2 {
			majority_v2++
			if ver >= 3 {
				majority_v3++
			}
		}
		n = n.Parent
	}

	if bl.Version() < 2 && majority_v2 >= ch.Consensus.RejectBlock {
		er = errors.New("CheckBlock() : Rejected nVersion=1 block")
		dos = true
		return
	}

	if bl.Version() < 3 && majority_v3 >= ch.Consensus.RejectBlock {
		er = errors.New("CheckBlock() : Rejected nVersion=2 block")
		dos = true
		return
	}

	if bl.Txs == nil {
		er = bl.BuildTxList()
		if er != nil {
			dos = true
			return
		}
	}

	if !bl.Trusted {
		if bl.Version() >= 2 && majority_v2 >= ch.Consensus.EnforceUpgrade {
			var exp []byte
			if height >= 0x800000 {
//.........这里部分代码省略.........

func (ch *Chain) PreCheckBlock(bl *btc.Block) (er error, dos bool, maybelater bool) {
	// Size limits
	if len(bl.Raw) < 81 {
		er = errors.New("CheckBlock() : size limits failed - RPC_Result:bad-blk-length")
		dos = true
		return
	}

	if bl.Version() == 0 {
		er = errors.New("CheckBlock() : Block version 0 not allowed - RPC_Result:bad-version")
		dos = true
		return
	}

	// Check proof-of-work
	if !btc.CheckProofOfWork(bl.Hash, bl.Bits()) {
		er = errors.New("CheckBlock() : proof of work failed - RPC_Result:high-hash")
		dos = true
		return
	}

	// Check timestamp (must not be higher than now +2 hours)
	if int64(bl.BlockTime()) > time.Now().Unix()+2*60*60 {
		er = errors.New("CheckBlock() : block timestamp too far in the future - RPC_Result:time-too-new")
		dos = true
		return
	}

	if prv, pres := ch.BlockIndex[bl.Hash.BIdx()]; pres {
		if prv.Parent == nil {
			// This is genesis block
			er = errors.New("Genesis")
			return
		} else {
			er = errors.New("CheckBlock: " + bl.Hash.String() + " already in - RPC_Result:duplicate")
			return
		}
	}

	prevblk, ok := ch.BlockIndex[btc.NewUint256(bl.ParentHash()).BIdx()]
	if !ok {
		er = errors.New("CheckBlock: " + bl.Hash.String() + " parent not found - RPC_Result:bad-prevblk")
		maybelater = true
		return
	}

	bl.Height = prevblk.Height + 1

	// Reject the block if it reaches into the chain deeper than our unwind buffer
	if prevblk != ch.BlockTreeEnd && int(ch.BlockTreeEnd.Height)-int(bl.Height) >= MovingCheckopintDepth {
		er = errors.New(fmt.Sprint("CheckBlock: btc.Block ", bl.Hash.String(),
			" hooks too deep into the chain: ", bl.Height, "/", ch.BlockTreeEnd.Height, " ",
			btc.NewUint256(bl.ParentHash()).String(), " - RPC_Result:bad-prevblk"))
		return
	}

	// Check proof of work
	gnwr := ch.GetNextWorkRequired(prevblk, bl.BlockTime())
	if bl.Bits() != gnwr {
		er = errors.New("CheckBlock: incorrect proof of work - RPC_Result:bad-diffbits")
		dos = true
		return
	}

	// Check timestamp against prev
	bl.MedianPastTime = prevblk.GetMedianTimePast()
	if bl.BlockTime() <= bl.MedianPastTime {
		er = errors.New("CheckBlock: block's timestamp is too early - RPC_Result:time-too-old")
		dos = true
		return
	}

	if bl.Version() < 2 && bl.Height >= ch.Consensus.BIP34Height ||
		bl.Version() < 3 && bl.Height >= ch.Consensus.BIP66Height ||
		bl.Version() < 4 && bl.Height >= ch.Consensus.BIP65Height {
		// bad block version
		erstr := fmt.Sprintf("0x%08x", bl.Version())
		er = errors.New("CheckBlock() : Rejected Version=" + erstr + " blolck - RPC_Result:bad-version(" + erstr + ")")
		dos = true
		return
	}
	return
}