7 "github.com/vapor/config"
8 "github.com/vapor/consensus"
9 "github.com/vapor/errors"
10 "github.com/vapor/math/checked"
11 "github.com/vapor/protocol/bc"
12 "github.com/vapor/protocol/vm"
17 // validate transaction error
19 ErrTxVersion = errors.New("invalid transaction version")
20 ErrWrongTransactionSize = errors.New("invalid transaction size")
21 ErrBadTimeRange = errors.New("invalid transaction time range")
22 ErrEmptyInputIDs = errors.New("got the empty InputIDs")
23 ErrNotStandardTx = errors.New("not standard transaction")
24 ErrWrongCoinbaseTransaction = errors.New("wrong coinbase transaction")
25 ErrWrongCoinbaseAsset = errors.New("wrong coinbase assetID")
26 ErrCoinbaseArbitraryOversize = errors.New("coinbase arbitrary size is larger than limit")
27 ErrEmptyResults = errors.New("transaction has no results")
28 ErrMismatchedAssetID = errors.New("mismatched assetID")
29 ErrMismatchedPosition = errors.New("mismatched value source/dest position")
30 ErrMismatchedReference = errors.New("mismatched reference")
31 ErrMismatchedValue = errors.New("mismatched value")
32 ErrMissingField = errors.New("missing required field")
33 ErrNoSource = errors.New("no source for value")
34 ErrOverflow = errors.New("arithmetic overflow/underflow")
35 ErrPosition = errors.New("invalid source or destination position")
36 ErrUnbalanced = errors.New("unbalanced asset amount between input and output")
37 ErrOverGasCredit = errors.New("all gas credit has been spend")
38 ErrGasCalculate = errors.New("gas usage calculate got a math error")
39 ErrVotePubKey = errors.New("invalid public key of vote")
40 ErrVoteOutputAmount = errors.New("invalid vote amount")
43 // GasState record the gas usage status
44 type GasState struct {
52 func (g *GasState) setGas(BTMValue int64, txSize int64) error {
54 return errors.Wrap(ErrGasCalculate, "input BTM is negative")
57 g.BTMValue = uint64(BTMValue)
60 if g.GasLeft, ok = checked.DivInt64(BTMValue, consensus.VMGasRate); !ok {
61 return errors.Wrap(ErrGasCalculate, "setGas calc gas amount")
64 if g.GasLeft > consensus.MaxGasAmount {
65 g.GasLeft = consensus.MaxGasAmount
68 if g.StorageGas, ok = checked.MulInt64(txSize, consensus.StorageGasRate); !ok {
69 return errors.Wrap(ErrGasCalculate, "setGas calc tx storage gas")
74 func (g *GasState) setGasValid() error {
76 if g.GasLeft, ok = checked.SubInt64(g.GasLeft, g.StorageGas); !ok || g.GasLeft < 0 {
77 return errors.Wrap(ErrGasCalculate, "setGasValid calc gasLeft")
80 if g.GasUsed, ok = checked.AddInt64(g.GasUsed, g.StorageGas); !ok {
81 return errors.Wrap(ErrGasCalculate, "setGasValid calc gasUsed")
88 func (g *GasState) updateUsage(gasLeft int64) error {
90 return errors.Wrap(ErrGasCalculate, "updateUsage input negative gas")
93 if gasUsed, ok := checked.SubInt64(g.GasLeft, gasLeft); ok {
97 return errors.Wrap(ErrGasCalculate, "updateUsage calc gas diff")
100 if !g.GasValid && (g.GasUsed > consensus.DefaultGasCredit || g.StorageGas > g.GasLeft) {
101 return ErrOverGasCredit
106 // validationState contains the context that must propagate through
107 // the transaction graph when validating entries.
108 type validationState struct {
112 entryID bc.Hash // The ID of the nearest enclosing entry
113 sourcePos uint64 // The source position, for validate ValueSources
114 destPos uint64 // The destination position, for validate ValueDestinations
115 cache map[bc.Hash]error // Memoized per-entry validation results
118 func checkValid(vs *validationState, e bc.Entry) (err error) {
120 entryID := bc.EntryID(e)
121 if err, ok = vs.cache[entryID]; ok {
126 vs.cache[entryID] = err
129 switch e := e.(type) {
131 for i, resID := range e.ResultIds {
132 resultEntry := vs.tx.Entries[*resID]
135 if err = checkValid(&vs2, resultEntry); err != nil {
136 return errors.Wrapf(err, "checking result %d", i)
140 if e.Version == 1 && len(e.ResultIds) == 0 {
141 return ErrEmptyResults
145 parity := make(map[bc.AssetID]int64)
146 for i, src := range e.Sources {
147 if src.Value.Amount > math.MaxInt64 {
148 return errors.WithDetailf(ErrOverflow, "amount %d exceeds maximum value 2^63", src.Value.Amount)
150 sum, ok := checked.AddInt64(parity[*src.Value.AssetId], int64(src.Value.Amount))
152 return errors.WithDetailf(ErrOverflow, "adding %d units of asset %x from mux source %d to total %d overflows int64", src.Value.Amount, src.Value.AssetId.Bytes(), i, parity[*src.Value.AssetId])
154 parity[*src.Value.AssetId] = sum
157 for i, dest := range e.WitnessDestinations {
158 sum, ok := parity[*dest.Value.AssetId]
160 return errors.WithDetailf(ErrNoSource, "mux destination %d, asset %x, has no corresponding source", i, dest.Value.AssetId.Bytes())
162 if dest.Value.Amount > math.MaxInt64 {
163 return errors.WithDetailf(ErrOverflow, "amount %d exceeds maximum value 2^63", dest.Value.Amount)
165 diff, ok := checked.SubInt64(sum, int64(dest.Value.Amount))
167 return errors.WithDetailf(ErrOverflow, "subtracting %d units of asset %x from mux destination %d from total %d underflows int64", dest.Value.Amount, dest.Value.AssetId.Bytes(), i, sum)
169 parity[*dest.Value.AssetId] = diff
172 for assetID, amount := range parity {
173 if assetID == *consensus.BTMAssetID {
174 if err = vs.gasStatus.setGas(amount, int64(vs.tx.SerializedSize)); err != nil {
177 } else if amount != 0 {
178 return errors.WithDetailf(ErrUnbalanced, "asset %x sources - destinations = %d (should be 0)", assetID.Bytes(), amount)
182 for _, BTMInputID := range vs.tx.GasInputIDs {
183 e, ok := vs.tx.Entries[BTMInputID]
185 return errors.Wrapf(bc.ErrMissingEntry, "entry for bytom input %x not found", BTMInputID)
189 vs2.entryID = BTMInputID
190 if err := checkValid(&vs2, e); err != nil {
191 return errors.Wrap(err, "checking gas input")
195 for i, dest := range e.WitnessDestinations {
197 vs2.destPos = uint64(i)
198 if err = checkValidDest(&vs2, dest); err != nil {
199 return errors.Wrapf(err, "checking mux destination %d", i)
203 if err := vs.gasStatus.setGasValid(); err != nil {
207 for i, src := range e.Sources {
209 vs2.sourcePos = uint64(i)
210 if err = checkValidSrc(&vs2, src); err != nil {
211 return errors.Wrapf(err, "checking mux source %d", i)
215 case *bc.IntraChainOutput:
218 if err = checkValidSrc(&vs2, e.Source); err != nil {
219 return errors.Wrap(err, "checking output source")
222 case *bc.CrossChainOutput:
225 if err = checkValidSrc(&vs2, e.Source); err != nil {
226 return errors.Wrap(err, "checking output source")
230 if len(e.Vote) != 64 {
235 if err = checkValidSrc(&vs2, e.Source); err != nil {
236 return errors.Wrap(err, "checking vote output source")
238 if e.Source.Value.Amount < consensus.MinVoteOutputAmount {
239 return ErrVoteOutputAmount
245 if err = checkValidSrc(&vs2, e.Source); err != nil {
246 return errors.Wrap(err, "checking retirement source")
249 case *bc.CrossChainInput:
251 assetID := e.AssetDefinition.ComputeAssetID()
252 if *e.Value.AssetId != *consensus.BTMAssetID && *e.Value.AssetId != assetID {
253 return errors.New("incorrect asset_id while checking CrossChainInput")
256 code := config.FederationProgrom(config.CommonConfig)
258 VmVersion: e.ControlProgram.VmVersion,
261 _, err := vm.Verify(NewTxVMContext(vs, e, prog, e.WitnessArguments), consensus.DefaultGasCredit)
263 return errors.Wrap(err, "checking cross-chain input control program")
268 if err = checkValidDest(&vs2, e.WitnessDestination); err != nil {
269 return errors.Wrap(err, "checking cross-chain input destination")
271 vs.gasStatus.StorageGas = 0
274 if e.SpentOutputId == nil {
275 return errors.Wrap(ErrMissingField, "spend without spent output ID")
278 spentOutput, err := vs.tx.IntraChainOutput(*e.SpentOutputId)
280 return errors.Wrap(err, "getting spend prevout")
283 gasLeft, err := vm.Verify(NewTxVMContext(vs, e, spentOutput.ControlProgram, e.WitnessArguments), vs.gasStatus.GasLeft)
285 return errors.Wrap(err, "checking control program")
287 if err = vs.gasStatus.updateUsage(gasLeft); err != nil {
291 eq, err := spentOutput.Source.Value.Equal(e.WitnessDestination.Value)
296 return errors.WithDetailf(
298 "previous output is for %d unit(s) of %x, spend wants %d unit(s) of %x",
299 spentOutput.Source.Value.Amount,
300 spentOutput.Source.Value.AssetId.Bytes(),
301 e.WitnessDestination.Value.Amount,
302 e.WitnessDestination.Value.AssetId.Bytes(),
307 if err = checkValidDest(&vs2, e.WitnessDestination); err != nil {
308 return errors.Wrap(err, "checking spend destination")
312 if e.SpentOutputId == nil {
313 return errors.Wrap(ErrMissingField, "vetoInput without vetoInput output ID")
316 voteOutput, err := vs.tx.VoteOutput(*e.SpentOutputId)
318 return errors.Wrap(err, "getting vetoInput prevout")
320 if len(voteOutput.Vote) != 64 {
324 gasLeft, err := vm.Verify(NewTxVMContext(vs, e, voteOutput.ControlProgram, e.WitnessArguments), vs.gasStatus.GasLeft)
326 return errors.Wrap(err, "checking control program")
328 if err = vs.gasStatus.updateUsage(gasLeft); err != nil {
332 eq, err := voteOutput.Source.Value.Equal(e.WitnessDestination.Value)
337 return errors.WithDetailf(
339 "previous output is for %d unit(s) of %x, vetoInput wants %d unit(s) of %x",
340 voteOutput.Source.Value.Amount,
341 voteOutput.Source.Value.AssetId.Bytes(),
342 e.WitnessDestination.Value.Amount,
343 e.WitnessDestination.Value.AssetId.Bytes(),
348 if err = checkValidDest(&vs2, e.WitnessDestination); err != nil {
349 return errors.Wrap(err, "checking vetoInput destination")
353 if vs.block == nil || len(vs.block.Transactions) == 0 || vs.block.Transactions[0] != vs.tx {
354 return ErrWrongCoinbaseTransaction
357 if *e.WitnessDestination.Value.AssetId != *consensus.BTMAssetID {
358 return ErrWrongCoinbaseAsset
361 if e.Arbitrary != nil && len(e.Arbitrary) > consensus.CoinbaseArbitrarySizeLimit {
362 return ErrCoinbaseArbitraryOversize
367 if err = checkValidDest(&vs2, e.WitnessDestination); err != nil {
368 return errors.Wrap(err, "checking coinbase destination")
370 vs.gasStatus.StorageGas = 0
373 return fmt.Errorf("entry has unexpected type %T", e)
379 func checkValidSrc(vstate *validationState, vs *bc.ValueSource) error {
381 return errors.Wrap(ErrMissingField, "empty value source")
384 return errors.Wrap(ErrMissingField, "missing ref on value source")
386 if vs.Value == nil || vs.Value.AssetId == nil {
387 return errors.Wrap(ErrMissingField, "missing value on value source")
390 e, ok := vstate.tx.Entries[*vs.Ref]
392 return errors.Wrapf(bc.ErrMissingEntry, "entry for value source %x not found", vs.Ref.Bytes())
396 vstate2.entryID = *vs.Ref
397 if err := checkValid(&vstate2, e); err != nil {
398 return errors.Wrap(err, "checking value source")
401 var dest *bc.ValueDestination
402 switch ref := e.(type) {
404 if vs.Position != 0 {
405 return errors.Wrapf(ErrPosition, "invalid position %d for veto-input source", vs.Position)
407 dest = ref.WitnessDestination
410 if vs.Position != 0 {
411 return errors.Wrapf(ErrPosition, "invalid position %d for coinbase source", vs.Position)
413 dest = ref.WitnessDestination
415 case *bc.CrossChainInput:
416 if vs.Position != 0 {
417 return errors.Wrapf(ErrPosition, "invalid position %d for cross-chain input source", vs.Position)
419 dest = ref.WitnessDestination
422 if vs.Position != 0 {
423 return errors.Wrapf(ErrPosition, "invalid position %d for spend source", vs.Position)
425 dest = ref.WitnessDestination
428 if vs.Position >= uint64(len(ref.WitnessDestinations)) {
429 return errors.Wrapf(ErrPosition, "invalid position %d for %d-destination mux source", vs.Position, len(ref.WitnessDestinations))
431 dest = ref.WitnessDestinations[vs.Position]
434 return errors.Wrapf(bc.ErrEntryType, "value source is %T, should be coinbase, cross-chain input, spend, or mux", e)
437 if dest.Ref == nil || *dest.Ref != vstate.entryID {
438 return errors.Wrapf(ErrMismatchedReference, "value source for %x has disagreeing destination %x", vstate.entryID.Bytes(), dest.Ref.Bytes())
441 if dest.Position != vstate.sourcePos {
442 return errors.Wrapf(ErrMismatchedPosition, "value source position %d disagrees with %d", dest.Position, vstate.sourcePos)
445 eq, err := dest.Value.Equal(vs.Value)
447 return errors.Sub(ErrMissingField, err)
450 return errors.Wrapf(ErrMismatchedValue, "source value %v disagrees with %v", dest.Value, vs.Value)
456 func checkValidDest(vs *validationState, vd *bc.ValueDestination) error {
458 return errors.Wrap(ErrMissingField, "empty value destination")
461 return errors.Wrap(ErrMissingField, "missing ref on value destination")
463 if vd.Value == nil || vd.Value.AssetId == nil {
464 return errors.Wrap(ErrMissingField, "missing value on value destination")
467 e, ok := vs.tx.Entries[*vd.Ref]
469 return errors.Wrapf(bc.ErrMissingEntry, "entry for value destination %x not found", vd.Ref.Bytes())
472 var src *bc.ValueSource
473 switch ref := e.(type) {
474 case *bc.IntraChainOutput:
475 if vd.Position != 0 {
476 return errors.Wrapf(ErrPosition, "invalid position %d for output destination", vd.Position)
480 case *bc.CrossChainOutput:
481 if vd.Position != 0 {
482 return errors.Wrapf(ErrPosition, "invalid position %d for output destination", vd.Position)
487 if vd.Position != 0 {
488 return errors.Wrapf(ErrPosition, "invalid position %d for output destination", vd.Position)
493 if vd.Position != 0 {
494 return errors.Wrapf(ErrPosition, "invalid position %d for retirement destination", vd.Position)
499 if vd.Position >= uint64(len(ref.Sources)) {
500 return errors.Wrapf(ErrPosition, "invalid position %d for %d-source mux destination", vd.Position, len(ref.Sources))
502 src = ref.Sources[vd.Position]
505 return errors.Wrapf(bc.ErrEntryType, "value destination is %T, should be intra-chain/cross-chain output, retirement, or mux", e)
508 if src.Ref == nil || *src.Ref != vs.entryID {
509 return errors.Wrapf(ErrMismatchedReference, "value destination for %x has disagreeing source %x", vs.entryID.Bytes(), src.Ref.Bytes())
512 if src.Position != vs.destPos {
513 return errors.Wrapf(ErrMismatchedPosition, "value destination position %d disagrees with %d", src.Position, vs.destPos)
516 eq, err := src.Value.Equal(vd.Value)
518 return errors.Sub(ErrMissingField, err)
521 return errors.Wrapf(ErrMismatchedValue, "destination value %v disagrees with %v", src.Value, vd.Value)
527 func checkInputID(tx *bc.Tx, blockHeight uint64) error {
528 for _, id := range tx.InputIDs {
529 if blockHeight >= ruleAA && id.IsZero() {
530 return ErrEmptyInputIDs
536 func checkTimeRange(tx *bc.Tx, block *bc.Block) error {
537 if tx.TimeRange == 0 {
541 if tx.TimeRange < block.Height {
542 return ErrBadTimeRange
548 // ValidateTx validates a transaction.
549 func ValidateTx(tx *bc.Tx, block *bc.Block) (*GasState, error) {
550 gasStatus := &GasState{GasValid: false}
551 if block.Version == 1 && tx.Version != 1 {
552 return gasStatus, errors.WithDetailf(ErrTxVersion, "block version %d, transaction version %d", block.Version, tx.Version)
554 if tx.SerializedSize == 0 {
555 return gasStatus, ErrWrongTransactionSize
557 if err := checkTimeRange(tx, block); err != nil {
558 return gasStatus, err
560 if err := checkInputID(tx, block.Height); err != nil {
561 return gasStatus, err
564 vs := &validationState{
568 gasStatus: gasStatus,
569 cache: make(map[bc.Hash]error),
571 return vs.gasStatus, checkValid(vs, tx.TxHeader)