예제 #1
0
// StakePoolTicketFee determines the stake pool ticket fee for a given ticket
// from the passed percentage. Pool fee as a percentage is truncated from 0.01%
// to 100.00%. This all must be done with integers, so bear with the big.Int
// usage below.
//
// See the included doc.go of this package for more information about the
// calculation of this fee.
func StakePoolTicketFee(stakeDiff dcrutil.Amount, relayFee dcrutil.Amount,
	height int32, poolFee float64, params *chaincfg.Params) dcrutil.Amount {
	// Shift the decimal two places, e.g. 1.00%
	// to 100. This assumes that the proportion
	// is already multiplied by 100 to give a
	// percentage, thus making the entirety
	// be a multiplication by 10000.
	poolFeeAbs := math.Floor(poolFee * 100.0)
	poolFeeInt := int64(poolFeeAbs)

	// Subsidy is fetched from the blockchain package, then
	// pushed forward a number of adjustment periods for
	// compensation in gradual subsidy decay. Recall that
	// the average time to claiming 50% of the tickets as
	// votes is the approximately the same as the ticket
	// pool size (params.TicketPoolSize), so take the
	// ceiling of the ticket pool size divided by the
	// reduction interval.
	adjs := int(math.Ceil(float64(params.TicketPoolSize) /
		float64(params.ReductionInterval)))
	initSubsidyCacheOnce.Do(func() {
		subsidyCache = blockchain.NewSubsidyCache(int64(height), params)
	})
	subsidy := blockchain.CalcStakeVoteSubsidy(subsidyCache, int64(height),
		params)
	for i := 0; i < adjs; i++ {
		subsidy *= 100
		subsidy /= 101
	}

	// The numerator is (p*10000*s*(v+z)) << 64.
	shift := uint(64)
	s := new(big.Int).SetInt64(subsidy)
	v := new(big.Int).SetInt64(int64(stakeDiff))
	z := new(big.Int).SetInt64(int64(relayFee))
	num := new(big.Int).SetInt64(poolFeeInt)
	num.Mul(num, s)
	vPlusZ := new(big.Int).Add(v, z)
	num.Mul(num, vPlusZ)
	num.Lsh(num, shift)

	// The denominator is 10000*(s+v).
	// The extra 10000 above cancels out.
	den := new(big.Int).Set(s)
	den.Add(den, v)
	den.Mul(den, new(big.Int).SetInt64(10000))

	// Divide and shift back.
	num.Div(num, den)
	num.Rsh(num, shift)

	return dcrutil.Amount(num.Int64())
}
예제 #2
0
파일: subsidy_test.go 프로젝트: decred/dcrd
func TestBlockSubsidy(t *testing.T) {
	mainnet := &chaincfg.MainNetParams
	subsidyCache := blockchain.NewSubsidyCache(0, mainnet)

	totalSubsidy := mainnet.BlockOneSubsidy()
	for i := int64(0); ; i++ {
		// Genesis block or first block.
		if i == 0 || i == 1 {
			continue
		}

		if i%mainnet.ReductionInterval == 0 {
			numBlocks := mainnet.ReductionInterval
			// First reduction internal, which is reduction interval - 2
			// to skip the genesis block and block one.
			if i == mainnet.ReductionInterval {
				numBlocks -= 2
			}
			height := i - numBlocks

			work := blockchain.CalcBlockWorkSubsidy(subsidyCache, height,
				mainnet.TicketsPerBlock, mainnet)
			stake := blockchain.CalcStakeVoteSubsidy(subsidyCache, height,
				mainnet) * int64(mainnet.TicketsPerBlock)
			tax := blockchain.CalcBlockTaxSubsidy(subsidyCache, height,
				mainnet.TicketsPerBlock, mainnet)
			if (work + stake + tax) == 0 {
				break
			}
			totalSubsidy += ((work + stake + tax) * numBlocks)

			// First reduction internal, subtract the stake subsidy for
			// blocks before the staking system is enabled.
			if i == mainnet.ReductionInterval {
				totalSubsidy -= stake * (mainnet.StakeValidationHeight - 2)
			}
		}
	}

	if totalSubsidy != 2099999999800912 {
		t.Errorf("Bad total subsidy; want 2099999999800912, got %v", totalSubsidy)
	}
}
예제 #3
0
파일: stake.go 프로젝트: decred/dcrwallet
// generateVote creates a new SSGen given a header hash, height, sstx
// tx hash, and votebits.
func (s *StakeStore) generateVote(ns walletdb.ReadWriteBucket, waddrmgrNs walletdb.ReadBucket, blockHash *chainhash.Hash, height int64, sstxHash *chainhash.Hash, defaultVoteBits stake.VoteBits, allowHighFees bool) (*StakeNotification, error) {
	// 1. Fetch the SStx, then calculate all the values we'll need later for
	// the generation of the SSGen tx outputs.
	sstxRecord, err := s.getSStx(ns, sstxHash)
	if err != nil {
		return nil, err
	}
	sstx := sstxRecord.tx
	sstxMsgTx := sstx.MsgTx()

	// The legacy wallet didn't store anything about the voteBits to use.
	// In the case we're loading a legacy wallet and the voteBits are
	// unset, just use the default voteBits as set by the user.
	voteBits := defaultVoteBits
	if sstxRecord.voteBitsSet {
		voteBits.Bits = sstxRecord.voteBits
		voteBits.ExtendedBits = sstxRecord.voteBitsExt
	}

	// Store the sstx pubkeyhashes and amounts as found in the transaction
	// outputs.
	// TODO Get information on the allowable fee range for the vote
	// and check to make sure we don't overflow that.
	ssgenPayTypes, ssgenPkhs, sstxAmts, _, _, _ :=
		stake.TxSStxStakeOutputInfo(sstxMsgTx)

	// Get the current reward.
	initSudsidyCacheOnce.Do(func() {
		subsidyCache = blockchain.NewSubsidyCache(height, s.Params)
	})
	stakeVoteSubsidy := blockchain.CalcStakeVoteSubsidy(subsidyCache,
		height, s.Params)

	// Calculate the output values from this data.
	ssgenCalcAmts := stake.CalculateRewards(sstxAmts,
		sstxMsgTx.TxOut[0].Value,
		stakeVoteSubsidy)

	subsidyCache = blockchain.NewSubsidyCache(height, s.Params)
	// 2. Add all transaction inputs to a new transaction after performing
	// some validity checks. First, add the stake base, then the OP_SSTX
	// tagged output.
	msgTx := wire.NewMsgTx()

	// Stakebase.
	stakeBaseOutPoint := wire.NewOutPoint(&chainhash.Hash{},
		uint32(0xFFFFFFFF),
		wire.TxTreeRegular)
	txInStakeBase := wire.NewTxIn(stakeBaseOutPoint, []byte{})
	msgTx.AddTxIn(txInStakeBase)

	// Add the subsidy amount into the input.
	msgTx.TxIn[0].ValueIn = stakeVoteSubsidy

	// SStx tagged output as an OutPoint.
	prevOut := wire.NewOutPoint(sstxHash,
		0, // Index 0
		1) // Tree stake
	txIn := wire.NewTxIn(prevOut, []byte{})
	msgTx.AddTxIn(txIn)

	// 3. Add the OP_RETURN null data pushes of the block header hash,
	// the block height, and votebits, then add all the OP_SSGEN tagged
	// outputs.
	//
	// Block reference output.
	blockRefScript, err := txscript.GenerateSSGenBlockRef(*blockHash,
		uint32(height))
	if err != nil {
		return nil, err
	}
	blockRefOut := wire.NewTxOut(0, blockRefScript)
	msgTx.AddTxOut(blockRefOut)

	// Votebits output.
	blockVBScript, err := generateVoteScript(voteBits)
	if err != nil {
		return nil, err
	}
	blockVBOut := wire.NewTxOut(0, blockVBScript)
	msgTx.AddTxOut(blockVBOut)

	// Add all the SSGen-tagged transaction outputs to the transaction after
	// performing some validity checks.
	for i, ssgenPkh := range ssgenPkhs {
		// Create a new script which pays to the provided address specified in
		// the original ticket tx.
		var ssgenOutScript []byte
		switch ssgenPayTypes[i] {
		case false: // P2PKH
			ssgenOutScript, err = txscript.PayToSSGenPKHDirect(ssgenPkh)
			if err != nil {
				return nil, err
			}
		case true: // P2SH
			ssgenOutScript, err = txscript.PayToSSGenSHDirect(ssgenPkh)
			if err != nil {
				return nil, err
			}
		}

		// Add the txout to our SSGen tx.
		txOut := wire.NewTxOut(ssgenCalcAmts[i], ssgenOutScript)

		msgTx.AddTxOut(txOut)
	}

	// Check to make sure our SSGen was created correctly.
	_, err = stake.IsSSGen(msgTx)
	if err != nil {
		return nil, err
	}

	// Sign the transaction.
	err = s.SignVRTransaction(waddrmgrNs, msgTx, sstx, true)
	if err != nil {
		return nil, err
	}

	// Store the information about the SSGen.
	hash := msgTx.TxSha()
	err = s.insertSSGen(ns,
		blockHash,
		height,
		&hash,
		voteBits.Bits,
		sstx.Sha())
	if err != nil {
		return nil, err
	}

	// Send the transaction.
	ssgenSha, err := s.chainSvr.SendRawTransaction(msgTx, allowHighFees)
	if err != nil {
		return nil, err
	}

	log.Debugf("Generated SSGen %v, voting on block %v at height %v. "+
		"The ticket used to generate the SSGen was %v.",
		ssgenSha, blockHash, height, sstxHash)

	// Generate a notification to return.
	ntfn := &StakeNotification{
		TxType:    int8(stake.TxTypeSSGen),
		TxHash:    *ssgenSha,
		BlockHash: *blockHash,
		Height:    int32(height),
		Amount:    0,
		SStxIn:    *sstx.Sha(),
		VoteBits:  voteBits.Bits,
	}

	return ntfn, nil
}