// Info returns generic information about the renter and the files that are
// being rented.
func (r *Renter) Info() (ri modules.RentInfo) {
lockID := r.mu.RLock()
// Include the list of files the renter knows about.
for filename := range r.files {
ri.Files = append(ri.Files, filename)
}
r.mu.RUnlock(lockID)
// Calculate the average cost of a file.
var totalPrice types.Currency
sampleSize := defaultParityPieces + defaultDataPieces
hosts := r.hostDB.RandomHosts(sampleSize)
for _, host := range hosts {
totalPrice = totalPrice.Add(host.Price)
}
if len(hosts) == 0 {
return
}
averagePrice := totalPrice.Div(types.NewCurrency64(uint64(len(hosts))))
estimatedCost := averagePrice.Mul(types.NewCurrency64(defaultDuration)).Mul(types.NewCurrency64(1e9)).Mul(types.NewCurrency64(defaultParityPieces + defaultDataPieces))
// this also accounts for the buffering in the contract negotiation
bufferedCost := estimatedCost.Mul(types.NewCurrency64(5)).Div(types.NewCurrency64(2))
ri.Price = bufferedCost
// Report the number of known hosts.
ri.KnownHosts = len(r.hostDB.ActiveHosts())
return
}
// checkWalletBalance looks at an upload and determines if there is enough
// money in the wallet to support such an upload. An error is returned if it is
// determined that there is not enough money.
func (r *Renter) checkWalletBalance(up modules.FileUploadParams) error {
// Get the size of the file.
fileInfo, err := os.Stat(up.Filename)
if err != nil {
return err
}
curSize := types.NewCurrency64(uint64(fileInfo.Size()))
var averagePrice types.Currency
sampleSize := up.ErasureCode.NumPieces() * 3 / 2
hosts := r.hostDB.RandomHosts(sampleSize)
for _, host := range hosts {
averagePrice = averagePrice.Add(host.Price)
}
if len(hosts) == 0 {
return errors.New("no hosts!")
}
averagePrice = averagePrice.Div(types.NewCurrency64(uint64(len(hosts))))
estimatedCost := averagePrice.Mul(types.NewCurrency64(uint64(up.Duration))).Mul(curSize)
bufferedCost := estimatedCost.Mul(types.NewCurrency64(2))
siacoinBalance, _, _ := r.wallet.ConfirmedBalance()
if bufferedCost.Cmp(siacoinBalance) > 0 {
return errors.New("insufficient balance for upload")
}
return nil
}
// maxSectors is the estimated maximum number of sectors that the allowance
// can support.
func maxSectors(a modules.Allowance, hdb hostDB) (uint64, error) {
if a.Hosts == 0 || a.Period == 0 {
return 0, errors.New("invalid allowance")
}
// Sample at least 10 hosts.
nRandomHosts := int(a.Hosts)
if nRandomHosts < 10 {
nRandomHosts = 10
}
hosts := hdb.RandomHosts(nRandomHosts, nil)
if len(hosts) < int(a.Hosts) {
return 0, errors.New("not enough hosts")
}
// Calculate cost of storing 1 sector per host for the allowance period.
var sum types.Currency
for _, h := range hosts {
sum = sum.Add(h.StoragePrice)
}
averagePrice := sum.Div64(uint64(len(hosts)))
costPerSector := averagePrice.Mul64(a.Hosts).Mul64(modules.SectorSize).Mul64(uint64(a.Period))
// Divide total funds by cost per sector.
numSectors, err := a.Funds.Div(costPerSector).Uint64()
if err != nil {
// if there was an overflow, something is definitely wrong
return 0, errors.New("allowance can fund suspiciously large number of sectors")
}
return numSectors, nil
}
// checkSiacoins counts the number of siacoins in the database and verifies
// that it matches the sum of all the coinbases.
func (cs *ConsensusSet) checkSiacoins() error {
// Calculate the number of expected coins in constant time.
deflationBlocks := types.InitialCoinbase - types.MinimumCoinbase
expectedSiacoins := types.CalculateCoinbase(0).Add(types.CalculateCoinbase(cs.height())).Div(types.NewCurrency64(2))
if cs.height() < types.BlockHeight(deflationBlocks) {
expectedSiacoins = expectedSiacoins.Mul(types.NewCurrency64(uint64(cs.height()) + 1))
} else {
expectedSiacoins = expectedSiacoins.Mul(types.NewCurrency64(deflationBlocks + 1))
trailingSiacoins := types.NewCurrency64(uint64(cs.height()) - deflationBlocks).Mul(types.CalculateCoinbase(cs.height()))
expectedSiacoins = expectedSiacoins.Add(trailingSiacoins)
}
totalSiacoins := types.ZeroCurrency
cs.db.forEachSiacoinOutputs(func(scoid types.SiacoinOutputID, sco types.SiacoinOutput) {
totalSiacoins = totalSiacoins.Add(sco.Value)
})
cs.db.forEachFileContracts(func(fcid types.FileContractID, fc types.FileContract) {
var payout types.Currency
for _, output := range fc.ValidProofOutputs {
payout = payout.Add(output.Value)
}
totalSiacoins = totalSiacoins.Add(payout)
})
cs.db.forEachDelayedSiacoinOutputs(func(v types.SiacoinOutputID, dso types.SiacoinOutput) {
totalSiacoins = totalSiacoins.Add(dso.Value)
})
cs.db.forEachSiafundOutputs(func(sfoid types.SiafundOutputID, sfo types.SiafundOutput) {
sfoSiacoins := cs.siafundPool.Sub(sfo.ClaimStart).Div(types.SiafundCount).Mul(sfo.Value)
totalSiacoins = totalSiacoins.Add(sfoSiacoins)
})
if expectedSiacoins.Cmp(totalSiacoins) != 0 {
return errSiacoinMiscount
}
return nil
}
// validUnconfirmedSiafunds checks that all siafund inputs and outputs are
// valid within the context of the unconfirmed consensus set.
func (tp *TransactionPool) validUnconfirmedSiafunds(t types.Transaction) (err error) {
var inputSum types.Currency
for _, sfi := range t.SiafundInputs {
// Check that the corresponding siafund output being spent exists.
sfo, exists := tp.siafundOutputs[sfi.ParentID]
if !exists {
return errors.New("transaction spends unrecognized siafund output")
}
// Check that the unlock conditions match the unlock hash of the
// corresponding output.
if sfi.UnlockConditions.UnlockHash() != sfo.UnlockHash {
return errors.New("transaction contains invalid unlock conditions (hash mismatch)")
}
// Add this input's value to the inputSum.
inputSum = inputSum.Add(sfo.Value)
}
// Check that the value of the outputs equal the value of the inputs.
var outputSum types.Currency
for _, sfo := range t.SiafundOutputs {
outputSum = outputSum.Add(sfo.Value)
}
if outputSum.Cmp(inputSum) != 0 {
return errors.New("siafund inputs do not equal siafund outputs")
}
return
}
// checkMinerFees checks that the total amount of transaction fees in the
// transaction set is sufficient to earn a spot in the transaction pool.
func (tp *TransactionPool) checkMinerFees(ts []types.Transaction) error {
// Transactions cannot be added after the TransactionPoolSizeLimit has been
// hit.
if tp.transactionListSize > TransactionPoolSizeLimit {
return errFullTransactionPool
}
// The first TransactionPoolSizeForFee transactions do not need fees.
if tp.transactionListSize > TransactionPoolSizeForFee {
// Currently required fees are set on a per-transaction basis. 2 coins
// are required per transaction if the free-fee limit has been reached,
// adding a larger fee is not useful.
var feeSum types.Currency
for i := range ts {
for _, fee := range ts[i].MinerFees {
feeSum = feeSum.Add(fee)
}
}
feeRequired := TransactionMinFee.Mul(types.NewCurrency64(uint64(len(ts))))
if feeSum.Cmp(feeRequired) < 0 {
return errLowMinerFees
}
}
return nil
}
// Info returns generic information about the renter and the files that are
// being rented.
func (r *Renter) Info() (ri modules.RentInfo) {
lockID := r.mu.RLock()
defer r.mu.RUnlock(lockID)
// Include the list of files the renter knows about.
for filename := range r.files {
ri.Files = append(ri.Files, filename)
}
// Calculate the average cost of a file.
var totalPrice types.Currency
redundancy := 6 // reasonable estimate until we come up with an alternative
sampleSize := redundancy * 3 / 2
hosts := r.hostDB.RandomHosts(sampleSize)
for _, host := range hosts {
totalPrice = totalPrice.Add(host.Price)
}
if len(hosts) == 0 {
return
}
averagePrice := totalPrice.Mul(types.NewCurrency64(2)).Div(types.NewCurrency64(3))
// HACK: 6000 is the duration (set by the API), and 1024^3 is a GB. Price
// is reported as per GB, no timeframe is given.
estimatedCost := averagePrice.Mul(types.NewCurrency64(6000)).Mul(types.NewCurrency64(1024 * 1024 * 1024))
bufferedCost := estimatedCost.Mul(types.NewCurrency64(4)).Div(types.NewCurrency64(3))
ri.Price = bufferedCost
// Report the number of known hosts.
ri.KnownHosts = len(r.hostDB.ActiveHosts())
return
}
// validSiafunds checks that the siafund portions of the transaction are valid
// in the context of the consensus set.
func (cs *ConsensusSet) validSiafunds(t types.Transaction) (err error) {
// Compare the number of input siafunds to the output siafunds.
var siafundInputSum types.Currency
var siafundOutputSum types.Currency
for _, sfi := range t.SiafundInputs {
exists := cs.db.inSiafundOutputs(sfi.ParentID)
if !exists {
return ErrMissingSiafundOutput
}
sfo := cs.db.getSiafundOutputs(sfi.ParentID)
// Check the unlock conditions match the unlock hash.
if sfi.UnlockConditions.UnlockHash() != sfo.UnlockHash {
return ErrWrongUnlockConditions
}
siafundInputSum = siafundInputSum.Add(sfo.Value)
}
for _, sfo := range t.SiafundOutputs {
siafundOutputSum = siafundOutputSum.Add(sfo.Value)
}
if siafundOutputSum.Cmp(siafundInputSum) != 0 {
return ErrSiafundInputOutputMismatch
}
return
}
// SendSiacoins creates a transaction sending 'amount' to 'dest'. The transaction
// is submitted to the transaction pool and is also returned.
func (w *Wallet) SendSiacoins(amount types.Currency, dest types.UnlockHash) ([]types.Transaction, error) {
if err := w.tg.Add(); err != nil {
return nil, err
}
defer w.tg.Done()
tpoolFee := types.SiacoinPrecision.Mul64(10) // TODO: better fee algo.
output := types.SiacoinOutput{
Value: amount,
UnlockHash: dest,
}
txnBuilder := w.StartTransaction()
err := txnBuilder.FundSiacoins(amount.Add(tpoolFee))
if err != nil {
return nil, err
}
txnBuilder.AddMinerFee(tpoolFee)
txnBuilder.AddSiacoinOutput(output)
txnSet, err := txnBuilder.Sign(true)
if err != nil {
return nil, err
}
err = w.tpool.AcceptTransactionSet(txnSet)
if err != nil {
return nil, err
}
return txnSet, nil
}
// validSiacoins checks that the siacoin inputs and outputs are valid in the
// context of the current consensus set.
func validSiacoins(tx *bolt.Tx, t types.Transaction) error {
scoBucket := tx.Bucket(SiacoinOutputs)
var inputSum types.Currency
for _, sci := range t.SiacoinInputs {
// Check that the input spends an existing output.
scoBytes := scoBucket.Get(sci.ParentID[:])
if scoBytes == nil {
return errMissingSiacoinOutput
}
// Check that the unlock conditions match the required unlock hash.
var sco types.SiacoinOutput
err := encoding.Unmarshal(scoBytes, &sco)
if build.DEBUG && err != nil {
panic(err)
}
if sci.UnlockConditions.UnlockHash() != sco.UnlockHash {
return errWrongUnlockConditions
}
inputSum = inputSum.Add(sco.Value)
}
if inputSum.Cmp(t.SiacoinOutputSum()) != 0 {
return errSiacoinInputOutputMismatch
}
return nil
}
// validSiafunds checks that the siafund portions of the transaction are valid
// in the context of the consensus set.
func validSiafunds(tx *bolt.Tx, t types.Transaction) (err error) {
// Compare the number of input siafunds to the output siafunds.
var siafundInputSum types.Currency
var siafundOutputSum types.Currency
for _, sfi := range t.SiafundInputs {
sfo, err := getSiafundOutput(tx, sfi.ParentID)
if err != nil {
return err
}
// Check the unlock conditions match the unlock hash.
if sfi.UnlockConditions.UnlockHash() != sfo.UnlockHash {
return errWrongUnlockConditions
}
siafundInputSum = siafundInputSum.Add(sfo.Value)
}
for _, sfo := range t.SiafundOutputs {
siafundOutputSum = siafundOutputSum.Add(sfo.Value)
}
if siafundOutputSum.Cmp(siafundInputSum) != 0 {
return errSiafundInputOutputMismatch
}
return
}
// wallettransactionscmd lists all of the transactions related to the wallet,
// providing a net flow of siacoins and siafunds for each.
func wallettransactionscmd() {
wtg := new(api.WalletTransactionsGET)
err := getAPI("/wallet/transactions?startheight=0&endheight=10000000", wtg)
if err != nil {
fmt.Println("Could not fetch transaction history:", err)
return
}
fmt.Println(" [height] [transaction id] [net siacoins] [net siafunds]")
txns := append(wtg.ConfirmedTransactions, wtg.UnconfirmedTransactions...)
for _, txn := range txns {
// Determine the number of outgoing siacoins and siafunds.
var outgoingSiacoins types.Currency
var outgoingSiafunds types.Currency
for _, input := range txn.Inputs {
if input.FundType == types.SpecifierSiacoinInput && input.WalletAddress {
outgoingSiacoins = outgoingSiacoins.Add(input.Value)
}
if input.FundType == types.SpecifierSiafundInput && input.WalletAddress {
outgoingSiafunds = outgoingSiafunds.Add(input.Value)
}
}
// Determine the number of incoming siacoins and siafunds.
var incomingSiacoins types.Currency
var incomingSiafunds types.Currency
for _, output := range txn.Outputs {
if output.FundType == types.SpecifierMinerPayout {
incomingSiacoins = incomingSiacoins.Add(output.Value)
}
if output.FundType == types.SpecifierSiacoinOutput && output.WalletAddress {
incomingSiacoins = incomingSiacoins.Add(output.Value)
}
if output.FundType == types.SpecifierSiafundOutput && output.WalletAddress {
incomingSiafunds = incomingSiafunds.Add(output.Value)
}
}
// Convert the siacoins to a float.
incomingSiacoinsFloat, _ := new(big.Rat).SetFrac(incomingSiacoins.Big(), types.SiacoinPrecision.Big()).Float64()
outgoingSiacoinsFloat, _ := new(big.Rat).SetFrac(outgoingSiacoins.Big(), types.SiacoinPrecision.Big()).Float64()
// Print the results.
if txn.ConfirmationHeight < 1e9 {
fmt.Printf("%12v", txn.ConfirmationHeight)
} else {
fmt.Printf(" unconfirmed")
}
fmt.Printf("%67v%15.2f SC", txn.TransactionID, incomingSiacoinsFloat-outgoingSiacoinsFloat)
// For siafunds, need to avoid having a negative types.Currency.
if incomingSiafunds.Cmp(outgoingSiafunds) >= 0 {
fmt.Printf("%14v SF\n", incomingSiafunds.Sub(outgoingSiafunds))
} else {
fmt.Printf("-%14v SF\n", outgoingSiafunds.Sub(incomingSiafunds))
}
}
}
// CalculateFee returns the fee-per-byte of a transaction set.
func CalculateFee(ts []types.Transaction) types.Currency {
var sum types.Currency
for _, t := range ts {
for _, fee := range t.MinerFees {
sum = sum.Add(fee)
}
}
size := len(encoding.Marshal(ts))
return sum.Div64(uint64(size))
}
// checkMinerPayouts compares a block's miner payouts to the block's subsidy and
// returns true if they are equal.
func checkMinerPayouts(b types.Block, height types.BlockHeight) bool {
// Add up the payouts and check that all values are legal.
var payoutSum types.Currency
for _, payout := range b.MinerPayouts {
if payout.Value.IsZero() {
return false
}
payoutSum = payoutSum.Add(payout.Value)
}
return b.CalculateSubsidy(height).Cmp(payoutSum) == 0
}
// AveragePrice returns the average price of a host.
func (hdb *HostDB) AveragePrice() types.Currency {
// maybe a more sophisticated way of doing this
var totalPrice types.Currency
sampleSize := 18
hosts := hdb.randomHosts(sampleSize, nil)
if len(hosts) == 0 {
return totalPrice
}
for _, host := range hosts {
totalPrice = totalPrice.Add(host.Price)
}
return totalPrice.Div(types.NewCurrency64(uint64(len(hosts))))
}
// validFileContractRevision checks that each file contract revision is valid
// in the context of the current consensus set.
func (cs *ConsensusSet) validFileContractRevisions(t types.Transaction) (err error) {
for _, fcr := range t.FileContractRevisions {
// Check that the revision revises an existing contract.
exists := cs.db.inFileContracts(fcr.ParentID)
if !exists {
return ErrUnrecognizedFileContractID
}
fc := cs.db.getFileContracts(fcr.ParentID)
// Check that the height is less than fc.WindowStart - revisions are
// not allowed to be submitted once the storage proof window has
// opened. This reduces complexity for unconfirmed transactions.
if cs.height() > fc.WindowStart {
return ErrLateRevision
}
// Check that the revision number of the revision is greater than the
// revision number of the existing file contract.
if fc.RevisionNumber >= fcr.NewRevisionNumber {
return ErrLowRevisionNumber
}
// Check that the unlock conditions match the unlock hash.
if fcr.UnlockConditions.UnlockHash() != fc.UnlockHash {
return ErrWrongUnlockConditions
}
// Check that the payout of the revision matches the payout of the
// original, and that the payouts match eachother.
var validPayout, missedPayout types.Currency
for _, output := range fcr.NewValidProofOutputs {
validPayout = validPayout.Add(output.Value)
}
for _, output := range fcr.NewMissedProofOutputs {
missedPayout = missedPayout.Add(output.Value)
}
if validPayout.Cmp(fc.Payout.Sub(fc.Tax())) != 0 {
return ErrAlteredRevisionPayouts
}
if missedPayout.Cmp(fc.Payout.Sub(fc.Tax())) != 0 {
return ErrAlteredRevisionPayouts
}
}
return
}
// checkSiafundCount checks that the number of siafunds countable within the
// consensus set equal the expected number of siafunds for the block height.
func checkSiafundCount(tx *bolt.Tx) {
var total types.Currency
err := tx.Bucket(SiafundOutputs).ForEach(func(_, siafundOutputBytes []byte) error {
var sfo types.SiafundOutput
err := encoding.Unmarshal(siafundOutputBytes, &sfo)
if err != nil {
manageErr(tx, err)
}
total = total.Add(sfo.Value)
return nil
})
if err != nil {
manageErr(tx, err)
}
if total.Cmp(types.SiafundCount) != 0 {
manageErr(tx, errors.New("wrong number if siafunds in the consensus set"))
}
}
// managedFormAllowanceContracts handles the special case where no contracts
// need to be renewed when setting the allowance.
func (c *Contractor) managedFormAllowanceContracts(n int, numSectors uint64, a modules.Allowance) error {
if n <= 0 {
return nil
}
// if we're forming contracts but not renewing, the new contracts should
// have the same endHeight as the existing ones. Otherwise, the endHeight
// should be a full period.
c.mu.RLock()
endHeight := c.blockHeight + a.Period
if len(c.contracts) > 0 {
endHeight = c.contractEndHeight()
}
c.mu.RUnlock()
// form the contracts
formed, err := c.managedFormContracts(n, numSectors, endHeight)
if err != nil {
return err
}
// Set the allowance and replace the contract set
c.mu.Lock()
c.allowance = a
for _, contract := range formed {
c.contracts[contract.ID] = contract
}
// update metrics
var spending types.Currency
for _, contract := range c.contracts {
spending = spending.Add(contract.RenterFunds())
}
c.financialMetrics.ContractSpending = spending
err = c.saveSync()
c.mu.Unlock()
return err
}
// validUnconfirmedFileContractRevisions checks that all file contract
// revisions are valid within the context of the unconfirmed consensus set.
func (tp *TransactionPool) validUnconfirmedFileContractRevisions(t types.Transaction) (err error) {
for _, fcr := range t.FileContractRevisions {
// Check for the corresponding file contract in the unconfirmed set.
fc, exists := tp.fileContracts[fcr.ParentID]
if !exists {
return errors.New("revision given for unrecognized file contract")
}
// Check that the revision was submitted before the storage proof
// window opened.
if tp.consensusSetHeight > fc.WindowStart {
return errors.New("revision submitted too late")
}
// Check that the revision number is increasing as a result of the
// revision.
if fc.RevisionNumber >= fcr.NewRevisionNumber {
return errors.New("contract revision is outdated")
}
// Check that the unlock conditions match the unlock hash of the
// corresponding file contract.
if fcr.UnlockConditions.UnlockHash() != fc.UnlockHash {
return errors.New("unlock conditions do not meet required unlock hash")
}
// Check that the payouts in the revision add up to the payout of the
// contract.
var payout types.Currency
for _, output := range fcr.NewMissedProofOutputs {
payout = payout.Add(output.Value)
}
if payout.Cmp(fc.Payout) != 0 {
return errors.New("contract revision has incorrect payouts")
}
}
return
}
func (h *Host) Info() modules.HostInfo {
lockID := h.mu.RLock()
defer h.mu.RUnlock(lockID)
info := modules.HostInfo{
HostSettings: h.HostSettings,
StorageRemaining: h.spaceRemaining,
NumContracts: len(h.obligationsByID),
Profit: h.profit,
}
// sum up the current obligations to calculate PotentialProfit
for _, obligation := range h.obligationsByID {
fc := obligation.FileContract
info.PotentialProfit = info.PotentialProfit.Add(types.PostTax(h.blockHeight, fc.Payout))
}
// Calculate estimated competition (reported in per GB per month). Price
// calculated by taking the average of hosts 8-15.
var averagePrice types.Currency
hosts := h.hostdb.RandomHosts(15)
for i, host := range hosts {
if i < 8 {
continue
}
averagePrice = averagePrice.Add(host.Price)
}
if len(hosts) == 0 {
return info
}
averagePrice = averagePrice.Div(types.NewCurrency64(uint64(len(hosts))))
// HACK: 4320 is one month, and 1024^3 is a GB. Price is reported as per GB
// per month.
estimatedCost := averagePrice.Mul(types.NewCurrency64(4320)).Mul(types.NewCurrency64(1024 * 1024 * 1024))
info.Competition = estimatedCost
return info
}
// validUnconfirmedSiacoins checks that all siacoin inputs and outputs are
// valid in the context of the unconfirmed consensus set.
func (tp *TransactionPool) validUnconfirmedSiacoins(t types.Transaction) (err error) {
var inputSum types.Currency
for _, sci := range t.SiacoinInputs {
// All inputs must have corresponding outputs in the unconfirmed set.
sco, exists := tp.siacoinOutputs[sci.ParentID]
if !exists {
return ErrUnrecognizedSiacoinInput
}
// The unlock conditions provided must match the unlock hash of the
// corresponding output.
if sci.UnlockConditions.UnlockHash() != sco.UnlockHash {
return ErrBadUnlockConditions
}
inputSum = inputSum.Add(sco.Value)
}
// The sum of all inputs must equal the sum of all outputs.
if inputSum.Cmp(t.SiacoinOutputSum()) != 0 {
return ErrSiacoinOverspend
}
return
}
// SendCoins creates a transaction sending 'amount' to 'dest'. The transaction
// is submitted to the transaction pool and is also returned.
func (w *Wallet) SendCoins(amount types.Currency, dest types.UnlockHash) (t types.Transaction, err error) {
// Add a transaction fee of 10 siacoins.
tpoolFee := types.NewCurrency64(10).Mul(types.SiacoinPrecision)
// Create and send the transaction.
output := types.SiacoinOutput{
Value: amount,
UnlockHash: dest,
}
id, err := w.RegisterTransaction(t)
if err != nil {
return
}
_, err = w.FundTransaction(id, amount.Add(tpoolFee))
if err != nil {
return
}
_, _, err = w.AddMinerFee(id, tpoolFee)
if err != nil {
return
}
_, _, err = w.AddSiacoinOutput(id, output)
if err != nil {
return
}
t, err = w.SignTransaction(id, true)
if err != nil {
return
}
err = w.tpool.AcceptTransaction(t)
if err != nil {
return
}
return
}
// validFileContractRevision checks that each file contract revision is valid
// in the context of the current consensus set.
func validFileContractRevisions(tx *bolt.Tx, t types.Transaction) error {
for _, fcr := range t.FileContractRevisions {
fc, err := getFileContract(tx, fcr.ParentID)
if err != nil {
return err
}
// Check that the height is less than fc.WindowStart - revisions are
// not allowed to be submitted once the storage proof window has
// opened. This reduces complexity for unconfirmed transactions.
if blockHeight(tx) > fc.WindowStart {
return errLateRevision
}
// Check that the revision number of the revision is greater than the
// revision number of the existing file contract.
if fc.RevisionNumber >= fcr.NewRevisionNumber {
return errLowRevisionNumber
}
// Check that the unlock conditions match the unlock hash.
if fcr.UnlockConditions.UnlockHash() != fc.UnlockHash {
return errWrongUnlockConditions
}
// Check that the payout of the revision matches the payout of the
// original, and that the payouts match each other.
var validPayout, missedPayout, oldPayout types.Currency
for _, output := range fcr.NewValidProofOutputs {
validPayout = validPayout.Add(output.Value)
}
for _, output := range fcr.NewMissedProofOutputs {
missedPayout = missedPayout.Add(output.Value)
}
for _, output := range fc.ValidProofOutputs {
oldPayout = oldPayout.Add(output.Value)
}
if validPayout.Cmp(oldPayout) != 0 {
return errAlteredRevisionPayouts
}
if missedPayout.Cmp(oldPayout) != 0 {
return errAlteredRevisionPayouts
}
}
return nil
}
// FundSiacoins will add a siacoin input of exaclty 'amount' to the
// transaction. A parent transaction may be needed to achieve an input with the
// correct value. The siacoin input will not be signed until 'Sign' is called
// on the transaction builder.
func (tb *transactionBuilder) FundSiacoins(amount types.Currency) error {
tb.wallet.mu.Lock()
defer tb.wallet.mu.Unlock()
// Collect a value-sorted set of siacoin outputs.
var so sortedOutputs
for scoid, sco := range tb.wallet.siacoinOutputs {
so.ids = append(so.ids, scoid)
so.outputs = append(so.outputs, sco)
}
// Add all of the unconfirmed outputs as well.
for _, upt := range tb.wallet.unconfirmedProcessedTransactions {
for i, sco := range upt.Transaction.SiacoinOutputs {
// Determine if the output belongs to the wallet.
_, exists := tb.wallet.keys[sco.UnlockHash]
if !exists {
continue
}
so.ids = append(so.ids, upt.Transaction.SiacoinOutputID(uint64(i)))
so.outputs = append(so.outputs, sco)
}
}
sort.Sort(sort.Reverse(so))
// Create and fund a parent transaction that will add the correct amount of
// siacoins to the transaction.
var fund types.Currency
// potentialFund tracks the balance of the wallet including outputs that
// have been spent in other unconfirmed transactions recently. This is to
// provide the user with a more useful error message in the event that they
// are overspending.
var potentialFund types.Currency
parentTxn := types.Transaction{}
var spentScoids []types.SiacoinOutputID
for i := range so.ids {
scoid := so.ids[i]
sco := so.outputs[i]
// Check that this output has not recently been spent by the wallet.
spendHeight := tb.wallet.spentOutputs[types.OutputID(scoid)]
// Prevent an underflow error.
allowedHeight := tb.wallet.consensusSetHeight - RespendTimeout
if tb.wallet.consensusSetHeight < RespendTimeout {
allowedHeight = 0
}
if spendHeight > allowedHeight {
potentialFund = potentialFund.Add(sco.Value)
continue
}
outputUnlockConditions := tb.wallet.keys[sco.UnlockHash].UnlockConditions
if tb.wallet.consensusSetHeight < outputUnlockConditions.Timelock {
continue
}
// Add a siacoin input for this output.
sci := types.SiacoinInput{
ParentID: scoid,
UnlockConditions: outputUnlockConditions,
}
parentTxn.SiacoinInputs = append(parentTxn.SiacoinInputs, sci)
spentScoids = append(spentScoids, scoid)
// Add the output to the total fund
fund = fund.Add(sco.Value)
potentialFund = potentialFund.Add(sco.Value)
if fund.Cmp(amount) >= 0 {
break
}
}
if potentialFund.Cmp(amount) >= 0 && fund.Cmp(amount) < 0 {
return modules.ErrPotentialDoubleSpend
}
if fund.Cmp(amount) < 0 {
return modules.ErrLowBalance
}
// Create and add the output that will be used to fund the standard
// transaction.
parentUnlockConditions, err := tb.wallet.nextPrimarySeedAddress()
if err != nil {
return err
}
exactOutput := types.SiacoinOutput{
Value: amount,
UnlockHash: parentUnlockConditions.UnlockHash(),
}
parentTxn.SiacoinOutputs = append(parentTxn.SiacoinOutputs, exactOutput)
// Create a refund output if needed.
if amount.Cmp(fund) != 0 {
refundUnlockConditions, err := tb.wallet.nextPrimarySeedAddress()
if err != nil {
return err
}
refundOutput := types.SiacoinOutput{
Value: fund.Sub(amount),
UnlockHash: refundUnlockConditions.UnlockHash(),
}
parentTxn.SiacoinOutputs = append(parentTxn.SiacoinOutputs, refundOutput)
}
// Sign all of the inputs to the parent trancstion.
for _, sci := range parentTxn.SiacoinInputs {
_, err := addSignatures(&parentTxn, types.FullCoveredFields, sci.UnlockConditions, crypto.Hash(sci.ParentID), tb.wallet.keys[sci.UnlockConditions.UnlockHash()])
if err != nil {
return err
}
}
// Mark the parent output as spent. Must be done after the transaction is
// finished because otherwise the txid and output id will change.
tb.wallet.spentOutputs[types.OutputID(parentTxn.SiacoinOutputID(0))] = tb.wallet.consensusSetHeight
// Add the exact output.
newInput := types.SiacoinInput{
ParentID: parentTxn.SiacoinOutputID(0),
UnlockConditions: parentUnlockConditions,
}
tb.newParents = append(tb.newParents, len(tb.parents))
tb.parents = append(tb.parents, parentTxn)
tb.siacoinInputs = append(tb.siacoinInputs, len(tb.transaction.SiacoinInputs))
tb.transaction.SiacoinInputs = append(tb.transaction.SiacoinInputs, newInput)
// Mark all outputs that were spent as spent.
for _, scoid := range spentScoids {
tb.wallet.spentOutputs[types.OutputID(scoid)] = tb.wallet.consensusSetHeight
}
return nil
}
// FundSiafunds will add a siafund input of exaclty 'amount' to the
// transaction. A parent transaction may be needed to achieve an input with the
// correct value. The siafund input will not be signed until 'Sign' is called
// on the transaction builder.
func (tb *transactionBuilder) FundSiafunds(amount types.Currency) error {
tb.wallet.mu.Lock()
defer tb.wallet.mu.Unlock()
// Create and fund a parent transaction that will add the correct amount of
// siafunds to the transaction.
var fund types.Currency
var potentialFund types.Currency
parentTxn := types.Transaction{}
var spentSfoids []types.SiafundOutputID
for sfoid, sfo := range tb.wallet.siafundOutputs {
// Check that this output has not recently been spent by the wallet.
spendHeight := tb.wallet.spentOutputs[types.OutputID(sfoid)]
// Prevent an underflow error.
allowedHeight := tb.wallet.consensusSetHeight - RespendTimeout
if tb.wallet.consensusSetHeight < RespendTimeout {
allowedHeight = 0
}
if spendHeight > allowedHeight {
potentialFund = potentialFund.Add(sfo.Value)
continue
}
outputUnlockConditions := tb.wallet.keys[sfo.UnlockHash].UnlockConditions
if tb.wallet.consensusSetHeight < outputUnlockConditions.Timelock {
continue
}
// Add a siafund input for this output.
parentClaimUnlockConditions, err := tb.wallet.nextPrimarySeedAddress()
if err != nil {
return err
}
sfi := types.SiafundInput{
ParentID: sfoid,
UnlockConditions: outputUnlockConditions,
ClaimUnlockHash: parentClaimUnlockConditions.UnlockHash(),
}
parentTxn.SiafundInputs = append(parentTxn.SiafundInputs, sfi)
spentSfoids = append(spentSfoids, sfoid)
// Add the output to the total fund
fund = fund.Add(sfo.Value)
potentialFund = potentialFund.Add(sfo.Value)
if fund.Cmp(amount) >= 0 {
break
}
}
if potentialFund.Cmp(amount) >= 0 && fund.Cmp(amount) < 0 {
return modules.ErrPotentialDoubleSpend
}
if fund.Cmp(amount) < 0 {
return modules.ErrLowBalance
}
// Create and add the output that will be used to fund the standard
// transaction.
parentUnlockConditions, err := tb.wallet.nextPrimarySeedAddress()
if err != nil {
return err
}
exactOutput := types.SiafundOutput{
Value: amount,
UnlockHash: parentUnlockConditions.UnlockHash(),
}
parentTxn.SiafundOutputs = append(parentTxn.SiafundOutputs, exactOutput)
// Create a refund output if needed.
if amount.Cmp(fund) != 0 {
refundUnlockConditions, err := tb.wallet.nextPrimarySeedAddress()
if err != nil {
return err
}
refundOutput := types.SiafundOutput{
Value: fund.Sub(amount),
UnlockHash: refundUnlockConditions.UnlockHash(),
}
parentTxn.SiafundOutputs = append(parentTxn.SiafundOutputs, refundOutput)
}
// Sign all of the inputs to the parent trancstion.
for _, sfi := range parentTxn.SiafundInputs {
_, err := addSignatures(&parentTxn, types.FullCoveredFields, sfi.UnlockConditions, crypto.Hash(sfi.ParentID), tb.wallet.keys[sfi.UnlockConditions.UnlockHash()])
if err != nil {
return err
}
}
// Add the exact output.
claimUnlockConditions, err := tb.wallet.nextPrimarySeedAddress()
if err != nil {
return err
}
newInput := types.SiafundInput{
ParentID: parentTxn.SiafundOutputID(0),
UnlockConditions: parentUnlockConditions,
ClaimUnlockHash: claimUnlockConditions.UnlockHash(),
}
tb.newParents = append(tb.newParents, len(tb.parents))
tb.parents = append(tb.parents, parentTxn)
tb.siafundInputs = append(tb.siafundInputs, len(tb.transaction.SiafundInputs))
tb.transaction.SiafundInputs = append(tb.transaction.SiafundInputs, newInput)
// Mark all outputs that were spent as spent.
for _, sfoid := range spentSfoids {
tb.wallet.spentOutputs[types.OutputID(sfoid)] = tb.wallet.consensusSetHeight
}
return nil
}
// Renew negotiates a new contract for data already stored with a host, and
// submits the new contract transaction to tpool.
func Renew(contract modules.RenterContract, params ContractParams, txnBuilder transactionBuilder, tpool transactionPool) (modules.RenterContract, error) {
// extract vars from params, for convenience
host, filesize, startHeight, endHeight, refundAddress := params.Host, params.Filesize, params.StartHeight, params.EndHeight, params.RefundAddress
ourSK := contract.SecretKey
// calculate cost to renter and cost to host
storageAllocation := host.StoragePrice.Mul64(filesize).Mul64(uint64(endHeight - startHeight))
hostCollateral := host.Collateral.Mul64(filesize).Mul64(uint64(endHeight - startHeight))
if hostCollateral.Cmp(host.MaxCollateral) > 0 {
// TODO: if we have to cap the collateral, it probably means we shouldn't be using this host
// (ok within a factor of 2)
hostCollateral = host.MaxCollateral
}
// Calculate additional basePrice and baseCollateral. If the contract
// height did not increase, basePrice and baseCollateral are zero.
var basePrice, baseCollateral types.Currency
if endHeight+host.WindowSize > contract.LastRevision.NewWindowEnd {
timeExtension := uint64((endHeight + host.WindowSize) - contract.LastRevision.NewWindowEnd)
basePrice = host.StoragePrice.Mul64(contract.LastRevision.NewFileSize).Mul64(timeExtension) // cost of data already covered by contract, i.e. lastrevision.Filesize
baseCollateral = host.Collateral.Mul64(contract.LastRevision.NewFileSize).Mul64(timeExtension) // same but collateral
}
hostPayout := hostCollateral.Add(host.ContractPrice).Add(basePrice)
payout := storageAllocation.Add(hostCollateral.Add(host.ContractPrice)).Mul64(10406).Div64(10000) // renter covers siafund fee
renterCost := payout.Sub(hostCollateral)
// check for negative currency
if types.PostTax(startHeight, payout).Cmp(hostPayout) < 0 {
return modules.RenterContract{}, errors.New("payout smaller than host payout")
} else if hostCollateral.Cmp(baseCollateral) < 0 {
return modules.RenterContract{}, errors.New("new collateral smaller than old collateral")
}
// create file contract
fc := types.FileContract{
FileSize: contract.LastRevision.NewFileSize,
FileMerkleRoot: contract.LastRevision.NewFileMerkleRoot,
WindowStart: endHeight,
WindowEnd: endHeight + host.WindowSize,
Payout: payout,
UnlockHash: contract.LastRevision.NewUnlockHash,
RevisionNumber: 0,
ValidProofOutputs: []types.SiacoinOutput{
// renter
{Value: types.PostTax(startHeight, payout).Sub(hostPayout), UnlockHash: refundAddress},
// host
{Value: hostPayout, UnlockHash: host.UnlockHash},
},
MissedProofOutputs: []types.SiacoinOutput{
// renter
{Value: types.PostTax(startHeight, payout).Sub(hostPayout), UnlockHash: refundAddress},
// host gets its unused collateral back, plus the contract price
{Value: hostCollateral.Sub(baseCollateral).Add(host.ContractPrice), UnlockHash: host.UnlockHash},
// void gets the spent storage fees, plus the collateral being risked
{Value: basePrice.Add(baseCollateral), UnlockHash: types.UnlockHash{}},
},
}
// calculate transaction fee
_, maxFee := tpool.FeeEstimation()
fee := maxFee.Mul64(estTxnSize)
// build transaction containing fc
err := txnBuilder.FundSiacoins(renterCost.Add(fee))
if err != nil {
return modules.RenterContract{}, err
}
txnBuilder.AddFileContract(fc)
// add miner fee
txnBuilder.AddMinerFee(fee)
// create initial transaction set
txn, parentTxns := txnBuilder.View()
txnSet := append(parentTxns, txn)
// initiate connection
conn, err := net.DialTimeout("tcp", string(host.NetAddress), 15*time.Second)
if err != nil {
return modules.RenterContract{}, err
}
defer func() { _ = conn.Close() }()
// allot time for sending RPC ID, verifyRecentRevision, and verifySettings
extendDeadline(conn, modules.NegotiateRecentRevisionTime+modules.NegotiateSettingsTime)
if err = encoding.WriteObject(conn, modules.RPCRenewContract); err != nil {
return modules.RenterContract{}, errors.New("couldn't initiate RPC: " + err.Error())
}
// verify that both parties are renewing the same contract
if err = verifyRecentRevision(conn, contract); err != nil {
return modules.RenterContract{}, errors.New("revision exchange failed: " + err.Error())
}
// verify the host's settings and confirm its identity
host, err = verifySettings(conn, host)
if err != nil {
return modules.RenterContract{}, errors.New("settings exchange failed: " + err.Error())
}
if !host.AcceptingContracts {
return modules.RenterContract{}, errors.New("host is not accepting contracts")
}
// allot time for negotiation
extendDeadline(conn, modules.NegotiateRenewContractTime)
// send acceptance, txn signed by us, and pubkey
if err = modules.WriteNegotiationAcceptance(conn); err != nil {
return modules.RenterContract{}, errors.New("couldn't send initial acceptance: " + err.Error())
}
if err = encoding.WriteObject(conn, txnSet); err != nil {
return modules.RenterContract{}, errors.New("couldn't send the contract signed by us: " + err.Error())
}
if err = encoding.WriteObject(conn, ourSK.PublicKey()); err != nil {
return modules.RenterContract{}, errors.New("couldn't send our public key: " + err.Error())
}
// read acceptance and txn signed by host
if err = modules.ReadNegotiationAcceptance(conn); err != nil {
return modules.RenterContract{}, errors.New("host did not accept our proposed contract: " + err.Error())
}
// host now sends any new parent transactions, inputs and outputs that
// were added to the transaction
var newParents []types.Transaction
var newInputs []types.SiacoinInput
var newOutputs []types.SiacoinOutput
if err = encoding.ReadObject(conn, &newParents, types.BlockSizeLimit); err != nil {
return modules.RenterContract{}, errors.New("couldn't read the host's added parents: " + err.Error())
}
if err = encoding.ReadObject(conn, &newInputs, types.BlockSizeLimit); err != nil {
return modules.RenterContract{}, errors.New("couldn't read the host's added inputs: " + err.Error())
}
if err = encoding.ReadObject(conn, &newOutputs, types.BlockSizeLimit); err != nil {
return modules.RenterContract{}, errors.New("couldn't read the host's added outputs: " + err.Error())
}
// merge txnAdditions with txnSet
txnBuilder.AddParents(newParents)
for _, input := range newInputs {
txnBuilder.AddSiacoinInput(input)
}
for _, output := range newOutputs {
txnBuilder.AddSiacoinOutput(output)
}
// sign the txn
signedTxnSet, err := txnBuilder.Sign(true)
if err != nil {
return modules.RenterContract{}, modules.WriteNegotiationRejection(conn, errors.New("failed to sign transaction: "+err.Error()))
}
// calculate signatures added by the transaction builder
var addedSignatures []types.TransactionSignature
_, _, _, addedSignatureIndices := txnBuilder.ViewAdded()
for _, i := range addedSignatureIndices {
addedSignatures = append(addedSignatures, signedTxnSet[len(signedTxnSet)-1].TransactionSignatures[i])
}
// create initial (no-op) revision, transaction, and signature
initRevision := types.FileContractRevision{
ParentID: signedTxnSet[len(signedTxnSet)-1].FileContractID(0),
UnlockConditions: contract.LastRevision.UnlockConditions,
NewRevisionNumber: 1,
NewFileSize: fc.FileSize,
NewFileMerkleRoot: fc.FileMerkleRoot,
NewWindowStart: fc.WindowStart,
NewWindowEnd: fc.WindowEnd,
NewValidProofOutputs: fc.ValidProofOutputs,
NewMissedProofOutputs: fc.MissedProofOutputs,
NewUnlockHash: fc.UnlockHash,
}
renterRevisionSig := types.TransactionSignature{
ParentID: crypto.Hash(initRevision.ParentID),
PublicKeyIndex: 0,
CoveredFields: types.CoveredFields{
FileContractRevisions: []uint64{0},
},
}
revisionTxn := types.Transaction{
FileContractRevisions: []types.FileContractRevision{initRevision},
TransactionSignatures: []types.TransactionSignature{renterRevisionSig},
}
encodedSig, err := crypto.SignHash(revisionTxn.SigHash(0), ourSK)
if err != nil {
return modules.RenterContract{}, modules.WriteNegotiationRejection(conn, errors.New("failed to sign revision transaction: "+err.Error()))
}
revisionTxn.TransactionSignatures[0].Signature = encodedSig[:]
// Send acceptance and signatures
if err = modules.WriteNegotiationAcceptance(conn); err != nil {
return modules.RenterContract{}, errors.New("couldn't send transaction acceptance: " + err.Error())
}
if err = encoding.WriteObject(conn, addedSignatures); err != nil {
return modules.RenterContract{}, errors.New("couldn't send added signatures: " + err.Error())
}
if err = encoding.WriteObject(conn, revisionTxn.TransactionSignatures[0]); err != nil {
return modules.RenterContract{}, errors.New("couldn't send revision signature: " + err.Error())
}
// Read the host acceptance and signatures.
err = modules.ReadNegotiationAcceptance(conn)
if err != nil {
return modules.RenterContract{}, errors.New("host did not accept our signatures: " + err.Error())
}
var hostSigs []types.TransactionSignature
if err = encoding.ReadObject(conn, &hostSigs, 2e3); err != nil {
return modules.RenterContract{}, errors.New("couldn't read the host's signatures: " + err.Error())
}
for _, sig := range hostSigs {
txnBuilder.AddTransactionSignature(sig)
}
var hostRevisionSig types.TransactionSignature
if err = encoding.ReadObject(conn, &hostRevisionSig, 2e3); err != nil {
return modules.RenterContract{}, errors.New("couldn't read the host's revision signature: " + err.Error())
}
revisionTxn.TransactionSignatures = append(revisionTxn.TransactionSignatures, hostRevisionSig)
// Construct the final transaction.
txn, parentTxns = txnBuilder.View()
txnSet = append(parentTxns, txn)
// Submit to blockchain.
err = tpool.AcceptTransactionSet(txnSet)
if err == modules.ErrDuplicateTransactionSet {
// as long as it made it into the transaction pool, we're good
err = nil
}
if err != nil {
return modules.RenterContract{}, err
}
// calculate contract ID
fcid := txn.FileContractID(0)
return modules.RenterContract{
FileContract: fc,
ID: fcid,
LastRevision: initRevision,
LastRevisionTxn: revisionTxn,
MerkleRoots: contract.MerkleRoots,
NetAddress: host.NetAddress,
SecretKey: ourSK,
}, nil
}
// TestRenterHandlerContracts checks that contract formation between a host and
// renter behaves as expected, and that contract spending is the right amount.
func TestRenterHandlerContracts(t *testing.T) {
if testing.Short() {
t.SkipNow()
}
st, err := createServerTester("TestRenterHandlerContracts")
if err != nil {
t.Fatal(err)
}
defer st.server.Close()
// Anounce the host and start accepting contracts.
if err := st.announceHost(); err != nil {
t.Fatal(err)
}
if err = st.acceptContracts(); err != nil {
t.Fatal(err)
}
if err = st.setHostStorage(); err != nil {
t.Fatal(err)
}
// The renter should not have any contracts yet.
var contracts RenterContracts
if err = st.getAPI("/renter/contracts", &contracts); err != nil {
t.Fatal(err)
}
if len(contracts.Contracts) != 0 {
t.Fatalf("expected renter to have 0 contracts; got %v", len(contracts.Contracts))
}
// Set an allowance for the renter, allowing a contract to be formed.
allowanceValues := url.Values{}
allowanceValues.Set("funds", testFunds)
allowanceValues.Set("period", testPeriod)
if err = st.stdPostAPI("/renter", allowanceValues); err != nil {
t.Fatal(err)
}
// The renter should now have 1 contract.
if err = st.getAPI("/renter/contracts", &contracts); err != nil {
t.Fatal(err)
}
if len(contracts.Contracts) != 1 {
t.Fatalf("expected renter to have 1 contract; got %v", len(contracts.Contracts))
}
// Check the renter's contract spending.
var get RenterGET
if err = st.getAPI("/renter", &get); err != nil {
t.Fatal(err)
}
var expectedContractSpending types.Currency
for _, contract := range contracts.Contracts {
expectedContractSpending = expectedContractSpending.Add(contract.RenterFunds)
}
if got := get.FinancialMetrics.ContractSpending; got.Cmp(expectedContractSpending) != 0 {
t.Fatalf("expected contract spending to be %v; got %v", expectedContractSpending, got)
}
}
// checkDSCOs scans the sets of delayed siacoin outputs and checks for
// consistency.
func checkDSCOs(tx *bolt.Tx) {
// Create a map to track which delayed siacoin output maps exist, and
// another map to track which ids have appeared in the dsco set.
dscoTracker := make(map[types.BlockHeight]struct{})
idMap := make(map[types.SiacoinOutputID]struct{})
// Iterate through all the buckets looking for the delayed siacoin output
// buckets, and check that they are for the correct heights.
err := tx.ForEach(func(name []byte, b *bolt.Bucket) error {
// If the bucket is not a delayed siacoin output bucket or a file
// contract expiration bucket, skip.
if !bytes.HasPrefix(name, prefixDSCO) {
return nil
}
// Add the bucket to the dscoTracker.
var height types.BlockHeight
err := encoding.Unmarshal(name[len(prefixDSCO):], &height)
if err != nil {
manageErr(tx, err)
}
_, exists := dscoTracker[height]
if exists {
return errors.New("repeat dsco map")
}
dscoTracker[height] = struct{}{}
var total types.Currency
err = b.ForEach(func(idBytes, delayedOutput []byte) error {
// Check that the output id has not appeared in another dsco.
var id types.SiacoinOutputID
copy(id[:], idBytes)
_, exists := idMap[id]
if exists {
return errors.New("repeat delayed siacoin output")
}
idMap[id] = struct{}{}
// Sum the funds in the bucket.
var sco types.SiacoinOutput
err := encoding.Unmarshal(delayedOutput, &sco)
if err != nil {
manageErr(tx, err)
}
total = total.Add(sco.Value)
return nil
})
if err != nil {
return err
}
// Check that the minimum value has been achieved - the coinbase from
// an earlier block is guaranteed to be in the bucket.
minimumValue := types.CalculateCoinbase(height - types.MaturityDelay)
if total.Cmp(minimumValue) < 0 {
return errors.New("total number of coins in the delayed output bucket is incorrect")
}
return nil
})
if err != nil {
manageErr(tx, err)
}
// Check that all of the correct heights are represented.
currentHeight := blockHeight(tx)
expectedBuckets := 0
for i := currentHeight + 1; i <= currentHeight+types.MaturityDelay; i++ {
if i < types.MaturityDelay {
continue
}
_, exists := dscoTracker[i]
if !exists {
manageErr(tx, errors.New("missing a dsco bucket"))
}
expectedBuckets++
}
if len(dscoTracker) != expectedBuckets {
manageErr(tx, errors.New("too many dsco buckets"))
}
}
// managedRevisionIteration handles one iteration of the revision loop. As a
// performance optimization, multiple iterations of revisions are allowed to be
// made over the same connection.
func (h *Host) managedRevisionIteration(conn net.Conn, so *storageObligation, finalIter bool) error {
// Send the settings to the renter. The host will keep going even if it is
// not accepting contracts, because in this case the contract already
// exists.
err := h.managedRPCSettings(conn)
if err != nil {
return err
}
// Set the negotiation deadline.
conn.SetDeadline(time.Now().Add(modules.NegotiateFileContractRevisionTime))
// The renter will either accept or reject the settings + revision
// transaction. It may also return a stop response to indicate that it
// wishes to terminate the revision loop.
err = modules.ReadNegotiationAcceptance(conn)
if err != nil {
return err
}
// Read some variables from the host for use later in the function.
h.mu.RLock()
settings := h.settings
secretKey := h.secretKey
blockHeight := h.blockHeight
h.mu.RUnlock()
// The renter is going to send its intended modifications, followed by the
// file contract revision that pays for them.
var modifications []modules.RevisionAction
var revision types.FileContractRevision
err = encoding.ReadObject(conn, &modifications, settings.MaxReviseBatchSize)
if err != nil {
return err
}
err = encoding.ReadObject(conn, &revision, modules.NegotiateMaxFileContractRevisionSize)
if err != nil {
return err
}
// First read all of the modifications. Then make the modifications, but
// with the ability to reverse them. Then verify the file contract revision
// correctly accounts for the changes.
var bandwidthRevenue types.Currency // Upload bandwidth.
var storageRevenue types.Currency
var newCollateral types.Currency
var sectorsRemoved []crypto.Hash
var sectorsGained []crypto.Hash
var gainedSectorData [][]byte
err = func() error {
for _, modification := range modifications {
// Check that the index points to an existing sector root. If the type
// is ActionInsert, we permit inserting at the end.
if modification.Type == modules.ActionInsert {
if modification.SectorIndex > uint64(len(so.SectorRoots)) {
return errBadModificationIndex
}
} else if modification.SectorIndex >= uint64(len(so.SectorRoots)) {
return errBadModificationIndex
}
// Check that the data sent for the sector is not too large.
if uint64(len(modification.Data)) > modules.SectorSize {
return errLargeSector
}
switch modification.Type {
case modules.ActionDelete:
// There is no financial information to change, it is enough to
// remove the sector.
sectorsRemoved = append(sectorsRemoved, so.SectorRoots[modification.SectorIndex])
so.SectorRoots = append(so.SectorRoots[0:modification.SectorIndex], so.SectorRoots[modification.SectorIndex+1:]...)
case modules.ActionInsert:
// Check that the sector size is correct.
if uint64(len(modification.Data)) != modules.SectorSize {
return errBadSectorSize
}
// Update finances.
blocksRemaining := so.proofDeadline() - blockHeight
blockBytesCurrency := types.NewCurrency64(uint64(blocksRemaining)).Mul64(modules.SectorSize)
bandwidthRevenue = bandwidthRevenue.Add(settings.MinUploadBandwidthPrice.Mul64(modules.SectorSize))
storageRevenue = storageRevenue.Add(settings.MinStoragePrice.Mul(blockBytesCurrency))
newCollateral = newCollateral.Add(settings.Collateral.Mul(blockBytesCurrency))
// Insert the sector into the root list.
newRoot := crypto.MerkleRoot(modification.Data)
sectorsGained = append(sectorsGained, newRoot)
gainedSectorData = append(gainedSectorData, modification.Data)
so.SectorRoots = append(so.SectorRoots[:modification.SectorIndex], append([]crypto.Hash{newRoot}, so.SectorRoots[modification.SectorIndex:]...)...)
case modules.ActionModify:
// Check that the offset and length are okay. Length is already
// known to be appropriately small, but the offset needs to be
// checked for being appropriately small as well otherwise there is
// a risk of overflow.
if modification.Offset > modules.SectorSize || modification.Offset+uint64(len(modification.Data)) > modules.SectorSize {
return errIllegalOffsetAndLength
}
// Get the data for the new sector.
sector, err := h.ReadSector(so.SectorRoots[modification.SectorIndex])
if err != nil {
return err
}
copy(sector[modification.Offset:], modification.Data)
// Update finances.
bandwidthRevenue = bandwidthRevenue.Add(settings.MinUploadBandwidthPrice.Mul64(uint64(len(modification.Data))))
// Update the sectors removed and gained to indicate that the old
// sector has been replaced with a new sector.
newRoot := crypto.MerkleRoot(sector)
sectorsRemoved = append(sectorsRemoved, so.SectorRoots[modification.SectorIndex])
sectorsGained = append(sectorsGained, newRoot)
gainedSectorData = append(gainedSectorData, sector)
so.SectorRoots[modification.SectorIndex] = newRoot
default:
return errUnknownModification
}
}
newRevenue := storageRevenue.Add(bandwidthRevenue)
return verifyRevision(so, revision, blockHeight, newRevenue, newCollateral)
}()
if err != nil {
return modules.WriteNegotiationRejection(conn, err)
}
// Revision is acceptable, write an acceptance string.
err = modules.WriteNegotiationAcceptance(conn)
if err != nil {
return err
}
// Renter will send a transaction signature for the file contract revision.
var renterSig types.TransactionSignature
err = encoding.ReadObject(conn, &renterSig, modules.NegotiateMaxTransactionSignatureSize)
if err != nil {
return err
}
// Verify that the signature is valid and get the host's signature.
txn, err := createRevisionSignature(revision, renterSig, secretKey, blockHeight)
if err != nil {
return modules.WriteNegotiationRejection(conn, err)
}
so.PotentialStorageRevenue = so.PotentialStorageRevenue.Add(storageRevenue)
so.RiskedCollateral = so.RiskedCollateral.Add(newCollateral)
so.PotentialUploadRevenue = so.PotentialUploadRevenue.Add(bandwidthRevenue)
so.RevisionTransactionSet = []types.Transaction{txn}
err = h.modifyStorageObligation(so, sectorsRemoved, sectorsGained, gainedSectorData)
if err != nil {
return modules.WriteNegotiationRejection(conn, err)
}
// Host will now send acceptance and its signature to the renter. This
// iteration is complete. If the finalIter flag is set, StopResponse will
// be sent instead. This indicates to the renter that the host wishes to
// terminate the revision loop.
if finalIter {
err = modules.WriteNegotiationStop(conn)
} else {
err = modules.WriteNegotiationAcceptance(conn)
}
if err != nil {
return err
}
return encoding.WriteObject(conn, txn.TransactionSignatures[1])
}
// checkSiacoinCount checks that the number of siacoins countable within the
// consensus set equal the expected number of siacoins for the block height.
func checkSiacoinCount(tx *bolt.Tx) {
// Iterate through all the buckets looking for the delayed siacoin output
// buckets, and check that they are for the correct heights.
var dscoSiacoins types.Currency
err := tx.ForEach(func(name []byte, b *bolt.Bucket) error {
// Check if the bucket is a delayed siacoin output bucket.
if !bytes.HasPrefix(name, prefixDSCO) {
return nil
}
// Sum up the delayed outputs in this bucket.
err := b.ForEach(func(_, delayedOutput []byte) error {
var sco types.SiacoinOutput
err := encoding.Unmarshal(delayedOutput, &sco)
if err != nil {
manageErr(tx, err)
}
dscoSiacoins = dscoSiacoins.Add(sco.Value)
return nil
})
if err != nil {
return err
}
return nil
})
if err != nil {
manageErr(tx, err)
}
// Add all of the siacoin outputs.
var scoSiacoins types.Currency
err = tx.Bucket(SiacoinOutputs).ForEach(func(_, scoBytes []byte) error {
var sco types.SiacoinOutput
err := encoding.Unmarshal(scoBytes, &sco)
if err != nil {
manageErr(tx, err)
}
scoSiacoins = scoSiacoins.Add(sco.Value)
return nil
})
if err != nil {
manageErr(tx, err)
}
// Add all of the payouts from file contracts.
var fcSiacoins types.Currency
err = tx.Bucket(FileContracts).ForEach(func(_, fcBytes []byte) error {
var fc types.FileContract
err := encoding.Unmarshal(fcBytes, &fc)
if err != nil {
manageErr(tx, err)
}
var fcCoins types.Currency
for _, output := range fc.ValidProofOutputs {
fcCoins = fcCoins.Add(output.Value)
}
fcSiacoins = fcSiacoins.Add(fcCoins)
return nil
})
if err != nil {
manageErr(tx, err)
}
// Add all of the siafund claims.
var claimSiacoins types.Currency
err = tx.Bucket(SiafundOutputs).ForEach(func(_, sfoBytes []byte) error {
var sfo types.SiafundOutput
err := encoding.Unmarshal(sfoBytes, &sfo)
if err != nil {
manageErr(tx, err)
}
coinsPerFund := getSiafundPool(tx).Sub(sfo.ClaimStart)
claimCoins := coinsPerFund.Mul(sfo.Value).Div(types.SiafundCount)
claimSiacoins = claimSiacoins.Add(claimCoins)
return nil
})
if err != nil {
manageErr(tx, err)
}
// Count how many coins should exist
deflationBlocks := types.BlockHeight(types.InitialCoinbase - types.MinimumCoinbase)
expectedSiacoins := types.CalculateCoinbase(0).Add(types.CalculateCoinbase(blockHeight(tx))).Div(types.NewCurrency64(2))
if blockHeight(tx) < deflationBlocks {
expectedSiacoins = expectedSiacoins.Mul(types.NewCurrency64(uint64(blockHeight(tx) + 1)))
} else {
expectedSiacoins = expectedSiacoins.Mul(types.NewCurrency64(uint64(deflationBlocks + 1)))
trailingSiacoins := types.NewCurrency64(uint64(blockHeight(tx) - deflationBlocks)).Mul(types.CalculateCoinbase(blockHeight(tx)))
expectedSiacoins = expectedSiacoins.Add(trailingSiacoins)
}
totalSiacoins := dscoSiacoins.Add(scoSiacoins).Add(fcSiacoins).Add(claimSiacoins)
if totalSiacoins.Cmp(expectedSiacoins) != 0 {
diagnostics := fmt.Sprintf("Wrong number of siacoins\nDsco: %v\nSco: %v\nFc: %v\nClaim: %v\n", dscoSiacoins, scoSiacoins, fcSiacoins, claimSiacoins)
if totalSiacoins.Cmp(expectedSiacoins) < 0 {
diagnostics += fmt.Sprintf("total: %v\nexpected: %v\n expected is bigger: %v", totalSiacoins, expectedSiacoins, expectedSiacoins.Sub(totalSiacoins))
} else {
diagnostics += fmt.Sprintf("total: %v\nexpected: %v\n expected is bigger: %v", totalSiacoins, expectedSiacoins, totalSiacoins.Sub(expectedSiacoins))
}
manageErr(tx, errors.New(diagnostics))
}
}