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tendermint/state/execution.go

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package state
import (
"bytes"
"errors"
"fmt"
acm "github.com/tendermint/tendermint/account"
. "github.com/tendermint/tendermint/common"
"github.com/tendermint/tendermint/events"
ptypes "github.com/tendermint/tendermint/permission/types" // for GlobalPermissionAddress ...
"github.com/tendermint/tendermint/types"
"github.com/tendermint/tendermint/vm"
)
// NOTE: If an error occurs during block execution, state will be left
// at an invalid state. Copy the state before calling ExecBlock!
func ExecBlock(s *State, block *types.Block, blockPartsHeader types.PartSetHeader) error {
err := execBlock(s, block, blockPartsHeader)
if err != nil {
return err
}
// State.Hash should match block.StateHash
stateHash := s.Hash()
if !bytes.Equal(stateHash, block.StateHash) {
return errors.New(Fmt("Invalid state hash. Expected %X, got %X",
stateHash, block.StateHash))
}
return nil
}
// executes transactions of a block, does not check block.StateHash
// NOTE: If an error occurs during block execution, state will be left
// at an invalid state. Copy the state before calling execBlock!
func execBlock(s *State, block *types.Block, blockPartsHeader types.PartSetHeader) error {
// Basic block validation.
err := block.ValidateBasic(s.ChainID, s.LastBlockHeight, s.LastBlockHash, s.LastBlockParts, s.LastBlockTime)
if err != nil {
return err
}
// Validate block LastValidation.
if block.Height == 1 {
if len(block.LastValidation.Precommits) != 0 {
return errors.New("Block at height 1 (first block) should have no LastValidation precommits")
}
} else {
if len(block.LastValidation.Precommits) != s.LastBondedValidators.Size() {
return errors.New(Fmt("Invalid block validation size. Expected %v, got %v",
s.LastBondedValidators.Size(), len(block.LastValidation.Precommits)))
}
err := s.LastBondedValidators.VerifyValidation(
s.ChainID, s.LastBlockHash, s.LastBlockParts, block.Height-1, block.LastValidation)
if err != nil {
return err
}
}
// Update Validator.LastCommitHeight as necessary.
for i, precommit := range block.LastValidation.Precommits {
if precommit == nil {
continue
}
_, val := s.LastBondedValidators.GetByIndex(i)
if val == nil {
PanicCrisis(Fmt("Failed to fetch validator at index %v", i))
}
if _, val_ := s.BondedValidators.GetByAddress(val.Address); val_ != nil {
val_.LastCommitHeight = block.Height - 1
updated := s.BondedValidators.Update(val_)
if !updated {
PanicCrisis("Failed to update bonded validator LastCommitHeight")
}
} else if _, val_ := s.UnbondingValidators.GetByAddress(val.Address); val_ != nil {
val_.LastCommitHeight = block.Height - 1
updated := s.UnbondingValidators.Update(val_)
if !updated {
PanicCrisis("Failed to update unbonding validator LastCommitHeight")
}
} else {
PanicCrisis("Could not find validator")
}
}
// Remember LastBondedValidators
s.LastBondedValidators = s.BondedValidators.Copy()
// Create BlockCache to cache changes to state.
blockCache := NewBlockCache(s)
// Execute each tx
for _, tx := range block.Data.Txs {
err := ExecTx(blockCache, tx, true, s.evc)
if err != nil {
return InvalidTxError{tx, err}
}
}
// Now sync the BlockCache to the backend.
blockCache.Sync()
// If any unbonding periods are over,
// reward account with bonded coins.
toRelease := []*Validator{}
s.UnbondingValidators.Iterate(func(index int, val *Validator) bool {
if val.UnbondHeight+unbondingPeriodBlocks < block.Height {
toRelease = append(toRelease, val)
}
return false
})
for _, val := range toRelease {
s.releaseValidator(val)
}
// If any validators haven't signed in a while,
// unbond them, they have timed out.
toTimeout := []*Validator{}
s.BondedValidators.Iterate(func(index int, val *Validator) bool {
lastActivityHeight := MaxInt(val.BondHeight, val.LastCommitHeight)
if lastActivityHeight+validatorTimeoutBlocks < block.Height {
log.Notice("Validator timeout", "validator", val, "height", block.Height)
toTimeout = append(toTimeout, val)
}
return false
})
for _, val := range toTimeout {
s.unbondValidator(val)
}
// Increment validator AccumPowers
s.BondedValidators.IncrementAccum(1)
s.LastBlockHeight = block.Height
s.LastBlockHash = block.Hash()
s.LastBlockParts = blockPartsHeader
s.LastBlockTime = block.Time
return nil
}
// The accounts from the TxInputs must either already have
// acm.PubKey.(type) != nil, (it must be known),
// or it must be specified in the TxInput. If redeclared,
// the TxInput is modified and input.PubKey set to nil.
func getInputs(state AccountGetter, ins []*types.TxInput) (map[string]*acm.Account, error) {
accounts := map[string]*acm.Account{}
for _, in := range ins {
// Account shouldn't be duplicated
if _, ok := accounts[string(in.Address)]; ok {
return nil, types.ErrTxDuplicateAddress
}
acc := state.GetAccount(in.Address)
if acc == nil {
return nil, types.ErrTxInvalidAddress
}
// PubKey should be present in either "account" or "in"
if err := checkInputPubKey(acc, in); err != nil {
return nil, err
}
accounts[string(in.Address)] = acc
}
return accounts, nil
}
func getOrMakeOutputs(state AccountGetter, accounts map[string]*acm.Account, outs []*types.TxOutput) (map[string]*acm.Account, error) {
if accounts == nil {
accounts = make(map[string]*acm.Account)
}
// we should err if an account is being created but the inputs don't have permission
var checkedCreatePerms bool
for _, out := range outs {
// Account shouldn't be duplicated
if _, ok := accounts[string(out.Address)]; ok {
return nil, types.ErrTxDuplicateAddress
}
acc := state.GetAccount(out.Address)
// output account may be nil (new)
if acc == nil {
if !checkedCreatePerms {
if !hasCreateAccountPermission(state, accounts) {
return nil, fmt.Errorf("At least one input does not have permission to create accounts")
}
checkedCreatePerms = true
}
acc = &acm.Account{
Address: out.Address,
PubKey: nil,
Sequence: 0,
Balance: 0,
Permissions: ptypes.ZeroAccountPermissions,
}
}
accounts[string(out.Address)] = acc
}
return accounts, nil
}
func checkInputPubKey(acc *acm.Account, in *types.TxInput) error {
if acc.PubKey == nil {
if in.PubKey == nil {
return types.ErrTxUnknownPubKey
}
if !bytes.Equal(in.PubKey.Address(), acc.Address) {
return types.ErrTxInvalidPubKey
}
acc.PubKey = in.PubKey
} else {
in.PubKey = nil
}
return nil
}
func validateInputs(accounts map[string]*acm.Account, signBytes []byte, ins []*types.TxInput) (total int64, err error) {
for _, in := range ins {
acc := accounts[string(in.Address)]
if acc == nil {
PanicSanity("validateInputs() expects account in accounts")
}
err = validateInput(acc, signBytes, in)
if err != nil {
return
}
// Good. Add amount to total
total += in.Amount
}
return total, nil
}
func validateInput(acc *acm.Account, signBytes []byte, in *types.TxInput) (err error) {
// Check TxInput basic
if err := in.ValidateBasic(); err != nil {
return err
}
// Check signatures
if !acc.PubKey.VerifyBytes(signBytes, in.Signature) {
return types.ErrTxInvalidSignature
}
// Check sequences
if acc.Sequence+1 != in.Sequence {
return types.ErrTxInvalidSequence{
Got: in.Sequence,
Expected: acc.Sequence + 1,
}
}
// Check amount
if acc.Balance < in.Amount {
return types.ErrTxInsufficientFunds
}
return nil
}
func validateOutputs(outs []*types.TxOutput) (total int64, err error) {
for _, out := range outs {
// Check TxOutput basic
if err := out.ValidateBasic(); err != nil {
return 0, err
}
// Good. Add amount to total
total += out.Amount
}
return total, nil
}
func adjustByInputs(accounts map[string]*acm.Account, ins []*types.TxInput) {
for _, in := range ins {
acc := accounts[string(in.Address)]
if acc == nil {
PanicSanity("adjustByInputs() expects account in accounts")
}
if acc.Balance < in.Amount {
PanicSanity("adjustByInputs() expects sufficient funds")
}
acc.Balance -= in.Amount
acc.Sequence += 1
}
}
func adjustByOutputs(accounts map[string]*acm.Account, outs []*types.TxOutput) {
for _, out := range outs {
acc := accounts[string(out.Address)]
if acc == nil {
PanicSanity("adjustByOutputs() expects account in accounts")
}
acc.Balance += out.Amount
}
}
// If the tx is invalid, an error will be returned.
// Unlike ExecBlock(), state will not be altered.
func ExecTx(blockCache *BlockCache, tx types.Tx, runCall bool, evc events.Fireable) (err error) {
// TODO: do something with fees
fees := int64(0)
_s := blockCache.State() // hack to access validators and block height
// Exec tx
switch tx := tx.(type) {
case *types.SendTx:
accounts, err := getInputs(blockCache, tx.Inputs)
if err != nil {
return err
}
// ensure all inputs have send permissions
if !hasSendPermission(blockCache, accounts) {
return fmt.Errorf("At least one input lacks permission for SendTx")
}
// add outputs to accounts map
// if any outputs don't exist, all inputs must have CreateAccount perm
accounts, err = getOrMakeOutputs(blockCache, accounts, tx.Outputs)
if err != nil {
return err
}
signBytes := acm.SignBytes(_s.ChainID, tx)
inTotal, err := validateInputs(accounts, signBytes, tx.Inputs)
if err != nil {
return err
}
outTotal, err := validateOutputs(tx.Outputs)
if err != nil {
return err
}
if outTotal > inTotal {
return types.ErrTxInsufficientFunds
}
fee := inTotal - outTotal
fees += fee
// Good! Adjust accounts
adjustByInputs(accounts, tx.Inputs)
adjustByOutputs(accounts, tx.Outputs)
for _, acc := range accounts {
blockCache.UpdateAccount(acc)
}
// if the evc is nil, nothing will happen
if evc != nil {
for _, i := range tx.Inputs {
evc.FireEvent(types.EventStringAccInput(i.Address), tx)
}
for _, o := range tx.Outputs {
evc.FireEvent(types.EventStringAccOutput(o.Address), tx)
}
}
return nil
case *types.CallTx:
var inAcc, outAcc *acm.Account
// Validate input
inAcc = blockCache.GetAccount(tx.Input.Address)
if inAcc == nil {
log.Info(Fmt("Can't find in account %X", tx.Input.Address))
return types.ErrTxInvalidAddress
}
createContract := len(tx.Address) == 0
if createContract {
if !hasCreateContractPermission(blockCache, inAcc) {
return fmt.Errorf("Account %X does not have CreateContract permission", tx.Input.Address)
}
} else {
if !hasCallPermission(blockCache, inAcc) {
return fmt.Errorf("Account %X does not have Call permission", tx.Input.Address)
}
}
// pubKey should be present in either "inAcc" or "tx.Input"
if err := checkInputPubKey(inAcc, tx.Input); err != nil {
log.Info(Fmt("Can't find pubkey for %X", tx.Input.Address))
return err
}
signBytes := acm.SignBytes(_s.ChainID, tx)
err := validateInput(inAcc, signBytes, tx.Input)
if err != nil {
log.Info(Fmt("validateInput failed on %X: %v", tx.Input.Address, err))
return err
}
if tx.Input.Amount < tx.Fee {
log.Info(Fmt("Sender did not send enough to cover the fee %X", tx.Input.Address))
return types.ErrTxInsufficientFunds
}
if !createContract {
// Validate output
if len(tx.Address) != 20 {
log.Info(Fmt("Destination address is not 20 bytes %X", tx.Address))
return types.ErrTxInvalidAddress
}
// check if its a native contract
if vm.RegisteredNativeContract(LeftPadWord256(tx.Address)) {
return fmt.Errorf("NativeContracts can not be called using CallTx. Use a contract or the appropriate tx type (eg. PermissionsTx, NameTx)")
}
// Output account may be nil if we are still in mempool and contract was created in same block as this tx
// but that's fine, because the account will be created properly when the create tx runs in the block
// and then this won't return nil. otherwise, we take their fee
outAcc = blockCache.GetAccount(tx.Address)
}
log.Info(Fmt("Out account: %v", outAcc))
// Good!
value := tx.Input.Amount - tx.Fee
inAcc.Sequence += 1
inAcc.Balance -= tx.Fee
blockCache.UpdateAccount(inAcc)
// The logic in runCall MUST NOT return.
if runCall {
// VM call variables
var (
gas int64 = tx.GasLimit
err error = nil
caller *vm.Account = toVMAccount(inAcc)
callee *vm.Account = nil // initialized below
code []byte = nil
ret []byte = nil
txCache = NewTxCache(blockCache)
params = vm.Params{
BlockHeight: int64(_s.LastBlockHeight),
BlockHash: LeftPadWord256(_s.LastBlockHash),
BlockTime: _s.LastBlockTime.Unix(),
GasLimit: _s.GetGasLimit(),
}
)
if !createContract && (outAcc == nil || len(outAcc.Code) == 0) {
// if you call an account that doesn't exist
// or an account with no code then we take fees (sorry pal)
// NOTE: it's fine to create a contract and call it within one
// block (nonce will prevent re-ordering of those txs)
// but to create with one contract and call with another
// you have to wait a block to avoid a re-ordering attack
// that will take your fees
if outAcc == nil {
log.Info(Fmt("%X tries to call %X but it does not exist.",
inAcc.Address, tx.Address))
} else {
log.Info(Fmt("%X tries to call %X but code is blank.",
inAcc.Address, tx.Address))
}
err = types.ErrTxInvalidAddress
goto CALL_COMPLETE
}
// get or create callee
if createContract {
// We already checked for permission
callee = txCache.CreateAccount(caller)
log.Info(Fmt("Created new contract %X", callee.Address))
code = tx.Data
} else {
callee = toVMAccount(outAcc)
log.Info(Fmt("Calling contract %X with code %X", callee.Address, callee.Code))
code = callee.Code
}
log.Info(Fmt("Code for this contract: %X", code))
// Run VM call and sync txCache to blockCache.
{ // Capture scope for goto.
// Write caller/callee to txCache.
txCache.UpdateAccount(caller)
txCache.UpdateAccount(callee)
vmach := vm.NewVM(txCache, params, caller.Address, types.TxID(_s.ChainID, tx))
vmach.SetFireable(evc)
// NOTE: Call() transfers the value from caller to callee iff call succeeds.
ret, err = vmach.Call(caller, callee, code, tx.Data, value, &gas)
if err != nil {
// Failure. Charge the gas fee. The 'value' was otherwise not transferred.
log.Info(Fmt("Error on execution: %v", err))
goto CALL_COMPLETE
}
log.Info("Successful execution")
if createContract {
callee.Code = ret
}
txCache.Sync()
}
CALL_COMPLETE: // err may or may not be nil.
// Create a receipt from the ret and whether errored.
log.Notice("VM call complete", "caller", caller, "callee", callee, "return", ret, "err", err)
// Fire Events for sender and receiver
// a separate event will be fired from vm for each additional call
if evc != nil {
exception := ""
if err != nil {
exception = err.Error()
}
evc.FireEvent(types.EventStringAccInput(tx.Input.Address), types.EventMsgCallTx{tx, ret, exception})
evc.FireEvent(types.EventStringAccOutput(tx.Address), types.EventMsgCallTx{tx, ret, exception})
}
} else {
// The mempool does not call txs until
// the proposer determines the order of txs.
// So mempool will skip the actual .Call(),
// and only deduct from the caller's balance.
inAcc.Balance -= value
if createContract {
inAcc.Sequence += 1
}
blockCache.UpdateAccount(inAcc)
}
return nil
case *types.NameTx:
var inAcc *acm.Account
// Validate input
inAcc = blockCache.GetAccount(tx.Input.Address)
if inAcc == nil {
log.Info(Fmt("Can't find in account %X", tx.Input.Address))
return types.ErrTxInvalidAddress
}
// check permission
if !hasNamePermission(blockCache, inAcc) {
return fmt.Errorf("Account %X does not have Name permission", tx.Input.Address)
}
// pubKey should be present in either "inAcc" or "tx.Input"
if err := checkInputPubKey(inAcc, tx.Input); err != nil {
log.Info(Fmt("Can't find pubkey for %X", tx.Input.Address))
return err
}
signBytes := acm.SignBytes(_s.ChainID, tx)
err := validateInput(inAcc, signBytes, tx.Input)
if err != nil {
log.Info(Fmt("validateInput failed on %X: %v", tx.Input.Address, err))
return err
}
// fee is in addition to the amount which is used to determine the TTL
if tx.Input.Amount < tx.Fee {
log.Info(Fmt("Sender did not send enough to cover the fee %X", tx.Input.Address))
return types.ErrTxInsufficientFunds
}
// validate the input strings
if err := tx.ValidateStrings(); err != nil {
log.Info(err.Error())
return types.ErrTxInvalidString
}
value := tx.Input.Amount - tx.Fee
// let's say cost of a name for one block is len(data) + 32
costPerBlock := types.NameCostPerBlock * types.NameCostPerByte * tx.BaseEntryCost()
expiresIn := int(value / costPerBlock)
lastBlockHeight := _s.LastBlockHeight
log.Info("New NameTx", "value", value, "costPerBlock", costPerBlock, "expiresIn", expiresIn, "lastBlock", lastBlockHeight)
// check if the name exists
entry := blockCache.GetNameRegEntry(tx.Name)
if entry != nil {
var expired bool
// if the entry already exists, and hasn't expired, we must be owner
if entry.Expires > lastBlockHeight {
// ensure we are owner
if bytes.Compare(entry.Owner, tx.Input.Address) != 0 {
log.Info(Fmt("Sender %X is trying to update a name (%s) for which he is not owner", tx.Input.Address, tx.Name))
return types.ErrTxPermissionDenied
}
} else {
expired = true
}
// no value and empty data means delete the entry
if value == 0 && len(tx.Data) == 0 {
// maybe we reward you for telling us we can delete this crap
// (owners if not expired, anyone if expired)
log.Info("Removing namereg entry", "name", entry.Name)
blockCache.RemoveNameRegEntry(entry.Name)
} else {
// update the entry by bumping the expiry
// and changing the data
if expired {
if expiresIn < types.MinNameRegistrationPeriod {
return errors.New(Fmt("Names must be registered for at least %d blocks", types.MinNameRegistrationPeriod))
}
entry.Expires = lastBlockHeight + expiresIn
entry.Owner = tx.Input.Address
log.Info("An old namereg entry has expired and been reclaimed", "name", entry.Name, "expiresIn", expiresIn, "owner", entry.Owner)
} else {
// since the size of the data may have changed
// we use the total amount of "credit"
oldCredit := int64(entry.Expires-lastBlockHeight) * types.BaseEntryCost(entry.Name, entry.Data)
credit := oldCredit + value
expiresIn = int(credit / costPerBlock)
if expiresIn < types.MinNameRegistrationPeriod {
return errors.New(Fmt("Names must be registered for at least %d blocks", types.MinNameRegistrationPeriod))
}
entry.Expires = lastBlockHeight + expiresIn
log.Info("Updated namereg entry", "name", entry.Name, "expiresIn", expiresIn, "oldCredit", oldCredit, "value", value, "credit", credit)
}
entry.Data = tx.Data
blockCache.UpdateNameRegEntry(entry)
}
} else {
if expiresIn < types.MinNameRegistrationPeriod {
return errors.New(Fmt("Names must be registered for at least %d blocks", types.MinNameRegistrationPeriod))
}
// entry does not exist, so create it
entry = &types.NameRegEntry{
Name: tx.Name,
Owner: tx.Input.Address,
Data: tx.Data,
Expires: lastBlockHeight + expiresIn,
}
log.Info("Creating namereg entry", "name", entry.Name, "expiresIn", expiresIn)
blockCache.UpdateNameRegEntry(entry)
}
// TODO: something with the value sent?
// Good!
inAcc.Sequence += 1
inAcc.Balance -= value
blockCache.UpdateAccount(inAcc)
// TODO: maybe we want to take funds on error and allow txs in that don't do anythingi?
return nil
case *types.BondTx:
valInfo := blockCache.State().GetValidatorInfo(tx.PubKey.Address())
if valInfo != nil {
// TODO: In the future, check that the validator wasn't destroyed,
// add funds, merge UnbondTo outputs, and unbond validator.
return errors.New("Adding coins to existing validators not yet supported")
}
accounts, err := getInputs(blockCache, tx.Inputs)
if err != nil {
return err
}
// add outputs to accounts map
// if any outputs don't exist, all inputs must have CreateAccount perm
// though outputs aren't created until unbonding/release time
canCreate := hasCreateAccountPermission(blockCache, accounts)
for _, out := range tx.UnbondTo {
acc := blockCache.GetAccount(out.Address)
if acc == nil && !canCreate {
return fmt.Errorf("At least one input does not have permission to create accounts")
}
}
bondAcc := blockCache.GetAccount(tx.PubKey.Address())
if !hasBondPermission(blockCache, bondAcc) {
return fmt.Errorf("The bonder does not have permission to bond")
}
if !hasBondOrSendPermission(blockCache, accounts) {
return fmt.Errorf("At least one input lacks permission to bond")
}
signBytes := acm.SignBytes(_s.ChainID, tx)
inTotal, err := validateInputs(accounts, signBytes, tx.Inputs)
if err != nil {
return err
}
if !tx.PubKey.VerifyBytes(signBytes, tx.Signature) {
return types.ErrTxInvalidSignature
}
outTotal, err := validateOutputs(tx.UnbondTo)
if err != nil {
return err
}
if outTotal > inTotal {
return types.ErrTxInsufficientFunds
}
fee := inTotal - outTotal
fees += fee
// Good! Adjust accounts
adjustByInputs(accounts, tx.Inputs)
for _, acc := range accounts {
blockCache.UpdateAccount(acc)
}
// Add ValidatorInfo
_s.SetValidatorInfo(&ValidatorInfo{
Address: tx.PubKey.Address(),
PubKey: tx.PubKey,
UnbondTo: tx.UnbondTo,
FirstBondHeight: _s.LastBlockHeight + 1,
FirstBondAmount: outTotal,
})
// Add Validator
added := _s.BondedValidators.Add(&Validator{
Address: tx.PubKey.Address(),
PubKey: tx.PubKey,
BondHeight: _s.LastBlockHeight + 1,
VotingPower: outTotal,
Accum: 0,
})
if !added {
PanicCrisis("Failed to add validator")
}
if evc != nil {
// TODO: fire for all inputs
evc.FireEvent(types.EventStringBond(), tx)
}
return nil
case *types.UnbondTx:
// The validator must be active
_, val := _s.BondedValidators.GetByAddress(tx.Address)
if val == nil {
return types.ErrTxInvalidAddress
}
// Verify the signature
signBytes := acm.SignBytes(_s.ChainID, tx)
if !val.PubKey.VerifyBytes(signBytes, tx.Signature) {
return types.ErrTxInvalidSignature
}
// tx.Height must be greater than val.LastCommitHeight
if tx.Height <= val.LastCommitHeight {
return errors.New("Invalid unbond height")
}
// Good!
_s.unbondValidator(val)
if evc != nil {
evc.FireEvent(types.EventStringUnbond(), tx)
}
return nil
case *types.RebondTx:
// The validator must be inactive
_, val := _s.UnbondingValidators.GetByAddress(tx.Address)
if val == nil {
return types.ErrTxInvalidAddress
}
// Verify the signature
signBytes := acm.SignBytes(_s.ChainID, tx)
if !val.PubKey.VerifyBytes(signBytes, tx.Signature) {
return types.ErrTxInvalidSignature
}
// tx.Height must be in a suitable range
minRebondHeight := _s.LastBlockHeight - (validatorTimeoutBlocks / 2)
maxRebondHeight := _s.LastBlockHeight + 2
if !((minRebondHeight <= tx.Height) && (tx.Height <= maxRebondHeight)) {
return errors.New(Fmt("Rebond height not in range. Expected %v <= %v <= %v",
minRebondHeight, tx.Height, maxRebondHeight))
}
// Good!
_s.rebondValidator(val)
if evc != nil {
evc.FireEvent(types.EventStringRebond(), tx)
}
return nil
case *types.DupeoutTx:
// Verify the signatures
_, accused := _s.BondedValidators.GetByAddress(tx.Address)
if accused == nil {
_, accused = _s.UnbondingValidators.GetByAddress(tx.Address)
if accused == nil {
return types.ErrTxInvalidAddress
}
}
voteASignBytes := acm.SignBytes(_s.ChainID, &tx.VoteA)
voteBSignBytes := acm.SignBytes(_s.ChainID, &tx.VoteB)
if !accused.PubKey.VerifyBytes(voteASignBytes, tx.VoteA.Signature) ||
!accused.PubKey.VerifyBytes(voteBSignBytes, tx.VoteB.Signature) {
return types.ErrTxInvalidSignature
}
// Verify equivocation
// TODO: in the future, just require one vote from a previous height that
// doesn't exist on this chain.
if tx.VoteA.Height != tx.VoteB.Height {
return errors.New("DupeoutTx heights don't match")
}
if tx.VoteA.Round != tx.VoteB.Round {
return errors.New("DupeoutTx rounds don't match")
}
if tx.VoteA.Type != tx.VoteB.Type {
return errors.New("DupeoutTx types don't match")
}
if bytes.Equal(tx.VoteA.BlockHash, tx.VoteB.BlockHash) {
return errors.New("DupeoutTx blockhashes shouldn't match")
}
// Good! (Bad validator!)
_s.destroyValidator(accused)
if evc != nil {
evc.FireEvent(types.EventStringDupeout(), tx)
}
return nil
case *types.PermissionsTx:
var inAcc *acm.Account
// Validate input
inAcc = blockCache.GetAccount(tx.Input.Address)
if inAcc == nil {
log.Debug(Fmt("Can't find in account %X", tx.Input.Address))
return types.ErrTxInvalidAddress
}
permFlag := tx.PermArgs.PermFlag()
// check permission
if !HasPermission(blockCache, inAcc, permFlag) {
return fmt.Errorf("Account %X does not have moderator permission %s (%b)", tx.Input.Address, ptypes.PermFlagToString(permFlag), permFlag)
}
// pubKey should be present in either "inAcc" or "tx.Input"
if err := checkInputPubKey(inAcc, tx.Input); err != nil {
log.Debug(Fmt("Can't find pubkey for %X", tx.Input.Address))
return err
}
signBytes := acm.SignBytes(_s.ChainID, tx)
err := validateInput(inAcc, signBytes, tx.Input)
if err != nil {
log.Debug(Fmt("validateInput failed on %X: %v", tx.Input.Address, err))
return err
}
value := tx.Input.Amount
log.Debug("New PermissionsTx", "function", ptypes.PermFlagToString(permFlag), "args", tx.PermArgs)
var permAcc *acm.Account
switch args := tx.PermArgs.(type) {
case *ptypes.HasBaseArgs:
// this one doesn't make sense from txs
return fmt.Errorf("HasBase is for contracts, not humans. Just look at the blockchain")
case *ptypes.SetBaseArgs:
if permAcc = blockCache.GetAccount(args.Address); permAcc == nil {
return fmt.Errorf("Trying to update permissions for unknown account %X", args.Address)
}
err = permAcc.Permissions.Base.Set(args.Permission, args.Value)
case *ptypes.UnsetBaseArgs:
if permAcc = blockCache.GetAccount(args.Address); permAcc == nil {
return fmt.Errorf("Trying to update permissions for unknown account %X", args.Address)
}
err = permAcc.Permissions.Base.Unset(args.Permission)
case *ptypes.SetGlobalArgs:
if permAcc = blockCache.GetAccount(ptypes.GlobalPermissionsAddress); permAcc == nil {
PanicSanity("can't find global permissions account")
}
err = permAcc.Permissions.Base.Set(args.Permission, args.Value)
case *ptypes.HasRoleArgs:
return fmt.Errorf("HasRole is for contracts, not humans. Just look at the blockchain")
case *ptypes.AddRoleArgs:
if permAcc = blockCache.GetAccount(args.Address); permAcc == nil {
return fmt.Errorf("Trying to update roles for unknown account %X", args.Address)
}
if !permAcc.Permissions.AddRole(args.Role) {
return fmt.Errorf("Role (%s) already exists for account %X", args.Role, args.Address)
}
case *ptypes.RmRoleArgs:
if permAcc = blockCache.GetAccount(args.Address); permAcc == nil {
return fmt.Errorf("Trying to update roles for unknown account %X", args.Address)
}
if !permAcc.Permissions.RmRole(args.Role) {
return fmt.Errorf("Role (%s) does not exist for account %X", args.Role, args.Address)
}
default:
PanicSanity(Fmt("invalid permission function: %s", ptypes.PermFlagToString(permFlag)))
}
// TODO: maybe we want to take funds on error and allow txs in that don't do anythingi?
if err != nil {
return err
}
// Good!
inAcc.Sequence += 1
inAcc.Balance -= value
blockCache.UpdateAccount(inAcc)
if permAcc != nil {
blockCache.UpdateAccount(permAcc)
}
if evc != nil {
evc.FireEvent(types.EventStringAccInput(tx.Input.Address), tx)
evc.FireEvent(types.EventStringPermissions(ptypes.PermFlagToString(permFlag)), tx)
}
return nil
default:
// binary decoding should not let this happen
PanicSanity("Unknown Tx type")
return nil
}
}
//---------------------------------------------------------------
// Get permission on an account or fall back to global value
func HasPermission(state AccountGetter, acc *acm.Account, perm ptypes.PermFlag) bool {
if perm > ptypes.AllPermFlags {
PanicSanity("Checking an unknown permission in state should never happen")
}
if acc == nil {
// TODO
// this needs to fall back to global or do some other specific things
// eg. a bondAcc may be nil and so can only bond if global bonding is true
}
permString := ptypes.PermFlagToString(perm)
v, err := acc.Permissions.Base.Get(perm)
if _, ok := err.(ptypes.ErrValueNotSet); ok {
if state == nil {
PanicSanity("All known global permissions should be set!")
}
log.Info("Permission for account is not set. Querying GlobalPermissionsAddress", "perm", permString)
return HasPermission(nil, state.GetAccount(ptypes.GlobalPermissionsAddress), perm)
} else if v {
log.Info("Account has permission", "address", Fmt("%X", acc.Address), "perm", permString)
} else {
log.Info("Account does not have permission", "address", Fmt("%X", acc.Address), "perm", permString)
}
return v
}
// TODO: for debug log the failed accounts
func hasSendPermission(state AccountGetter, accs map[string]*acm.Account) bool {
for _, acc := range accs {
if !HasPermission(state, acc, ptypes.Send) {
return false
}
}
return true
}
func hasNamePermission(state AccountGetter, acc *acm.Account) bool {
return HasPermission(state, acc, ptypes.Name)
}
func hasCallPermission(state AccountGetter, acc *acm.Account) bool {
return HasPermission(state, acc, ptypes.Call)
}
func hasCreateContractPermission(state AccountGetter, acc *acm.Account) bool {
return HasPermission(state, acc, ptypes.CreateContract)
}
func hasCreateAccountPermission(state AccountGetter, accs map[string]*acm.Account) bool {
for _, acc := range accs {
if !HasPermission(state, acc, ptypes.CreateAccount) {
return false
}
}
return true
}
func hasBondPermission(state AccountGetter, acc *acm.Account) bool {
return HasPermission(state, acc, ptypes.Bond)
}
func hasBondOrSendPermission(state AccountGetter, accs map[string]*acm.Account) bool {
for _, acc := range accs {
if !HasPermission(state, acc, ptypes.Bond) {
if !HasPermission(state, acc, ptypes.Send) {
return false
}
}
}
return true
}