7 "github.com/vapor/config"
8 "github.com/vapor/consensus"
9 "github.com/vapor/consensus/segwit"
10 "github.com/vapor/errors"
11 "github.com/vapor/math/checked"
12 "github.com/vapor/protocol/bc"
13 "github.com/vapor/protocol/vm"
18 // validate transaction error
20 ErrTxVersion = errors.New("invalid transaction version")
21 ErrWrongTransactionSize = errors.New("invalid transaction size")
22 ErrBadTimeRange = errors.New("invalid transaction time range")
23 ErrEmptyInputIDs = errors.New("got the empty InputIDs")
24 ErrNotStandardTx = errors.New("not standard transaction")
25 ErrWrongCoinbaseTransaction = errors.New("wrong coinbase transaction")
26 ErrWrongCoinbaseAsset = errors.New("wrong coinbase assetID")
27 ErrCoinbaseArbitraryOversize = errors.New("coinbase arbitrary size is larger than limit")
28 ErrEmptyResults = errors.New("transaction has no results")
29 ErrMismatchedAssetID = errors.New("mismatched assetID")
30 ErrMismatchedPosition = errors.New("mismatched value source/dest position")
31 ErrMismatchedReference = errors.New("mismatched reference")
32 ErrMismatchedValue = errors.New("mismatched value")
33 ErrMissingField = errors.New("missing required field")
34 ErrNoSource = errors.New("no source for value")
35 ErrOverflow = errors.New("arithmetic overflow/underflow")
36 ErrPosition = errors.New("invalid source or destination position")
37 ErrUnbalanced = errors.New("unbalanced asset amount between input and output")
38 ErrOverGasCredit = errors.New("all gas credit has been spend")
39 ErrGasCalculate = errors.New("gas usage calculate got a math error")
40 ErrVotePubKey = errors.New("invalid public key of vote")
41 ErrVoteOutputAmount = errors.New("invalid vote amount")
44 // GasState record the gas usage status
45 type GasState struct {
53 func (g *GasState) setGas(BTMValue int64, txSize int64) error {
55 return errors.Wrap(ErrGasCalculate, "input BTM is negative")
58 g.BTMValue = uint64(BTMValue)
61 if g.GasLeft, ok = checked.DivInt64(BTMValue, consensus.VMGasRate); !ok {
62 return errors.Wrap(ErrGasCalculate, "setGas calc gas amount")
65 if g.GasLeft > consensus.MaxGasAmount {
66 g.GasLeft = consensus.MaxGasAmount
69 if g.StorageGas, ok = checked.MulInt64(txSize, consensus.StorageGasRate); !ok {
70 return errors.Wrap(ErrGasCalculate, "setGas calc tx storage gas")
75 func (g *GasState) setGasValid() error {
77 if g.GasLeft, ok = checked.SubInt64(g.GasLeft, g.StorageGas); !ok || g.GasLeft < 0 {
78 return errors.Wrap(ErrGasCalculate, "setGasValid calc gasLeft")
81 if g.GasUsed, ok = checked.AddInt64(g.GasUsed, g.StorageGas); !ok {
82 return errors.Wrap(ErrGasCalculate, "setGasValid calc gasUsed")
89 func (g *GasState) updateUsage(gasLeft int64) error {
91 return errors.Wrap(ErrGasCalculate, "updateUsage input negative gas")
94 if gasUsed, ok := checked.SubInt64(g.GasLeft, gasLeft); ok {
98 return errors.Wrap(ErrGasCalculate, "updateUsage calc gas diff")
101 if !g.GasValid && (g.GasUsed > consensus.DefaultGasCredit || g.StorageGas > g.GasLeft) {
102 return ErrOverGasCredit
107 // validationState contains the context that must propagate through
108 // the transaction graph when validating entries.
109 type validationState struct {
113 entryID bc.Hash // The ID of the nearest enclosing entry
114 sourcePos uint64 // The source position, for validate ValueSources
115 destPos uint64 // The destination position, for validate ValueDestinations
116 cache map[bc.Hash]error // Memoized per-entry validation results
119 func checkValid(vs *validationState, e bc.Entry) (err error) {
121 entryID := bc.EntryID(e)
122 if err, ok = vs.cache[entryID]; ok {
127 vs.cache[entryID] = err
130 switch e := e.(type) {
132 for i, resID := range e.ResultIds {
133 resultEntry := vs.tx.Entries[*resID]
136 if err = checkValid(&vs2, resultEntry); err != nil {
137 return errors.Wrapf(err, "checking result %d", i)
141 if e.Version == 1 && len(e.ResultIds) == 0 {
142 return ErrEmptyResults
146 parity := make(map[bc.AssetID]int64)
147 for i, src := range e.Sources {
148 if src.Value.Amount > math.MaxInt64 {
149 return errors.WithDetailf(ErrOverflow, "amount %d exceeds maximum value 2^63", src.Value.Amount)
151 sum, ok := checked.AddInt64(parity[*src.Value.AssetId], int64(src.Value.Amount))
153 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])
155 parity[*src.Value.AssetId] = sum
158 for i, dest := range e.WitnessDestinations {
159 sum, ok := parity[*dest.Value.AssetId]
161 return errors.WithDetailf(ErrNoSource, "mux destination %d, asset %x, has no corresponding source", i, dest.Value.AssetId.Bytes())
163 if dest.Value.Amount > math.MaxInt64 {
164 return errors.WithDetailf(ErrOverflow, "amount %d exceeds maximum value 2^63", dest.Value.Amount)
166 diff, ok := checked.SubInt64(sum, int64(dest.Value.Amount))
168 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)
170 parity[*dest.Value.AssetId] = diff
173 for assetID, amount := range parity {
174 if assetID == *consensus.BTMAssetID {
175 if err = vs.gasStatus.setGas(amount, int64(vs.tx.SerializedSize)); err != nil {
178 } else if amount != 0 {
179 return errors.WithDetailf(ErrUnbalanced, "asset %x sources - destinations = %d (should be 0)", assetID.Bytes(), amount)
183 for _, BTMInputID := range vs.tx.GasInputIDs {
184 e, ok := vs.tx.Entries[BTMInputID]
186 return errors.Wrapf(bc.ErrMissingEntry, "entry for bytom input %x not found", BTMInputID)
190 vs2.entryID = BTMInputID
191 if err := checkValid(&vs2, e); err != nil {
192 return errors.Wrap(err, "checking gas input")
196 for i, dest := range e.WitnessDestinations {
198 vs2.destPos = uint64(i)
199 if err = checkValidDest(&vs2, dest); err != nil {
200 return errors.Wrapf(err, "checking mux destination %d", i)
204 if err := vs.gasStatus.setGasValid(); err != nil {
208 for i, src := range e.Sources {
210 vs2.sourcePos = uint64(i)
211 if err = checkValidSrc(&vs2, src); err != nil {
212 return errors.Wrapf(err, "checking mux source %d", i)
216 case *bc.IntraChainOutput:
219 if err = checkValidSrc(&vs2, e.Source); err != nil {
220 return errors.Wrap(err, "checking output source")
223 case *bc.CrossChainOutput:
226 if err = checkValidSrc(&vs2, e.Source); err != nil {
227 return errors.Wrap(err, "checking output source")
231 if len(e.Vote) != 64 {
236 if err = checkValidSrc(&vs2, e.Source); err != nil {
237 return errors.Wrap(err, "checking vote output source")
239 if e.Source.Value.Amount < consensus.MinVoteOutputAmount {
240 return ErrVoteOutputAmount
246 if err = checkValidSrc(&vs2, e.Source); err != nil {
247 return errors.Wrap(err, "checking retirement source")
250 case *bc.CrossChainInput:
252 assetID := e.AssetDefinition.ComputeAssetID()
253 if *e.Value.AssetId != *consensus.BTMAssetID && *e.Value.AssetId != assetID {
254 return errors.New("incorrect asset_id while checking CrossChainInput")
257 code := config.FederationProgrom(config.CommonConfig)
259 VmVersion: e.ControlProgram.VmVersion,
262 _, err := vm.Verify(NewTxVMContext(vs, e, prog, e.WitnessArguments), consensus.DefaultGasCredit)
264 return errors.Wrap(err, "checking cross-chain input control program")
269 if err = checkValidDest(&vs2, e.WitnessDestination); err != nil {
270 return errors.Wrap(err, "checking cross-chain input destination")
272 vs.gasStatus.StorageGas = 0
275 if e.SpentOutputId == nil {
276 return errors.Wrap(ErrMissingField, "spend without spent output ID")
279 spentOutput, err := vs.tx.IntraChainOutput(*e.SpentOutputId)
281 return errors.Wrap(err, "getting spend prevout")
284 gasLeft, err := vm.Verify(NewTxVMContext(vs, e, spentOutput.ControlProgram, e.WitnessArguments), vs.gasStatus.GasLeft)
286 return errors.Wrap(err, "checking control program")
288 if err = vs.gasStatus.updateUsage(gasLeft); err != nil {
292 eq, err := spentOutput.Source.Value.Equal(e.WitnessDestination.Value)
297 return errors.WithDetailf(
299 "previous output is for %d unit(s) of %x, spend wants %d unit(s) of %x",
300 spentOutput.Source.Value.Amount,
301 spentOutput.Source.Value.AssetId.Bytes(),
302 e.WitnessDestination.Value.Amount,
303 e.WitnessDestination.Value.AssetId.Bytes(),
308 if err = checkValidDest(&vs2, e.WitnessDestination); err != nil {
309 return errors.Wrap(err, "checking spend destination")
313 if e.SpentOutputId == nil {
314 return errors.Wrap(ErrMissingField, "vetoInput without vetoInput output ID")
317 voteOutput, err := vs.tx.VoteOutput(*e.SpentOutputId)
319 return errors.Wrap(err, "getting vetoInput prevout")
321 if len(voteOutput.Vote) != 64 {
325 gasLeft, err := vm.Verify(NewTxVMContext(vs, e, voteOutput.ControlProgram, e.WitnessArguments), vs.gasStatus.GasLeft)
327 return errors.Wrap(err, "checking control program")
329 if err = vs.gasStatus.updateUsage(gasLeft); err != nil {
333 eq, err := voteOutput.Source.Value.Equal(e.WitnessDestination.Value)
338 return errors.WithDetailf(
340 "previous output is for %d unit(s) of %x, vetoInput wants %d unit(s) of %x",
341 voteOutput.Source.Value.Amount,
342 voteOutput.Source.Value.AssetId.Bytes(),
343 e.WitnessDestination.Value.Amount,
344 e.WitnessDestination.Value.AssetId.Bytes(),
349 if err = checkValidDest(&vs2, e.WitnessDestination); err != nil {
350 return errors.Wrap(err, "checking vetoInput destination")
354 if vs.block == nil || len(vs.block.Transactions) == 0 || vs.block.Transactions[0] != vs.tx {
355 return ErrWrongCoinbaseTransaction
358 if *e.WitnessDestination.Value.AssetId != *consensus.BTMAssetID {
359 return ErrWrongCoinbaseAsset
362 if e.Arbitrary != nil && len(e.Arbitrary) > consensus.CoinbaseArbitrarySizeLimit {
363 return ErrCoinbaseArbitraryOversize
368 if err = checkValidDest(&vs2, e.WitnessDestination); err != nil {
369 return errors.Wrap(err, "checking coinbase destination")
371 vs.gasStatus.StorageGas = 0
374 return fmt.Errorf("entry has unexpected type %T", e)
380 func checkValidSrc(vstate *validationState, vs *bc.ValueSource) error {
382 return errors.Wrap(ErrMissingField, "empty value source")
385 return errors.Wrap(ErrMissingField, "missing ref on value source")
387 if vs.Value == nil || vs.Value.AssetId == nil {
388 return errors.Wrap(ErrMissingField, "missing value on value source")
391 e, ok := vstate.tx.Entries[*vs.Ref]
393 return errors.Wrapf(bc.ErrMissingEntry, "entry for value source %x not found", vs.Ref.Bytes())
397 vstate2.entryID = *vs.Ref
398 if err := checkValid(&vstate2, e); err != nil {
399 return errors.Wrap(err, "checking value source")
402 var dest *bc.ValueDestination
403 switch ref := e.(type) {
405 if vs.Position != 0 {
406 return errors.Wrapf(ErrPosition, "invalid position %d for veto-input source", vs.Position)
408 dest = ref.WitnessDestination
411 if vs.Position != 0 {
412 return errors.Wrapf(ErrPosition, "invalid position %d for coinbase source", vs.Position)
414 dest = ref.WitnessDestination
416 case *bc.CrossChainInput:
417 if vs.Position != 0 {
418 return errors.Wrapf(ErrPosition, "invalid position %d for cross-chain input source", vs.Position)
420 dest = ref.WitnessDestination
423 if vs.Position != 0 {
424 return errors.Wrapf(ErrPosition, "invalid position %d for spend source", vs.Position)
426 dest = ref.WitnessDestination
429 if vs.Position >= uint64(len(ref.WitnessDestinations)) {
430 return errors.Wrapf(ErrPosition, "invalid position %d for %d-destination mux source", vs.Position, len(ref.WitnessDestinations))
432 dest = ref.WitnessDestinations[vs.Position]
435 return errors.Wrapf(bc.ErrEntryType, "value source is %T, should be coinbase, cross-chain input, spend, or mux", e)
438 if dest.Ref == nil || *dest.Ref != vstate.entryID {
439 return errors.Wrapf(ErrMismatchedReference, "value source for %x has disagreeing destination %x", vstate.entryID.Bytes(), dest.Ref.Bytes())
442 if dest.Position != vstate.sourcePos {
443 return errors.Wrapf(ErrMismatchedPosition, "value source position %d disagrees with %d", dest.Position, vstate.sourcePos)
446 eq, err := dest.Value.Equal(vs.Value)
448 return errors.Sub(ErrMissingField, err)
451 return errors.Wrapf(ErrMismatchedValue, "source value %v disagrees with %v", dest.Value, vs.Value)
457 func checkValidDest(vs *validationState, vd *bc.ValueDestination) error {
459 return errors.Wrap(ErrMissingField, "empty value destination")
462 return errors.Wrap(ErrMissingField, "missing ref on value destination")
464 if vd.Value == nil || vd.Value.AssetId == nil {
465 return errors.Wrap(ErrMissingField, "missing value on value destination")
468 e, ok := vs.tx.Entries[*vd.Ref]
470 return errors.Wrapf(bc.ErrMissingEntry, "entry for value destination %x not found", vd.Ref.Bytes())
473 var src *bc.ValueSource
474 switch ref := e.(type) {
475 case *bc.IntraChainOutput:
476 if vd.Position != 0 {
477 return errors.Wrapf(ErrPosition, "invalid position %d for output destination", vd.Position)
481 case *bc.CrossChainOutput:
482 if vd.Position != 0 {
483 return errors.Wrapf(ErrPosition, "invalid position %d for output destination", vd.Position)
488 if vd.Position != 0 {
489 return errors.Wrapf(ErrPosition, "invalid position %d for output destination", vd.Position)
494 if vd.Position != 0 {
495 return errors.Wrapf(ErrPosition, "invalid position %d for retirement destination", vd.Position)
500 if vd.Position >= uint64(len(ref.Sources)) {
501 return errors.Wrapf(ErrPosition, "invalid position %d for %d-source mux destination", vd.Position, len(ref.Sources))
503 src = ref.Sources[vd.Position]
506 return errors.Wrapf(bc.ErrEntryType, "value destination is %T, should be intra-chain/cross-chain output, retirement, or mux", e)
509 if src.Ref == nil || *src.Ref != vs.entryID {
510 return errors.Wrapf(ErrMismatchedReference, "value destination for %x has disagreeing source %x", vs.entryID.Bytes(), src.Ref.Bytes())
513 if src.Position != vs.destPos {
514 return errors.Wrapf(ErrMismatchedPosition, "value destination position %d disagrees with %d", src.Position, vs.destPos)
517 eq, err := src.Value.Equal(vd.Value)
519 return errors.Sub(ErrMissingField, err)
522 return errors.Wrapf(ErrMismatchedValue, "destination value %v disagrees with %v", src.Value, vd.Value)
528 func checkStandardTx(tx *bc.Tx, blockHeight uint64) error {
529 for _, id := range tx.InputIDs {
530 if blockHeight >= ruleAA && id.IsZero() {
531 return ErrEmptyInputIDs
535 for _, id := range tx.GasInputIDs {
536 spend, err := tx.Spend(id)
542 outputEntry, err := tx.Entry(*spend.SpentOutputId)
546 switch output := outputEntry.(type) {
547 case *bc.IntraChainOutput:
548 code = output.ControlProgram.Code
550 code = output.ControlProgram.Code
552 return errors.Wrapf(bc.ErrEntryType, "entry %x has unexpected type %T", id.Bytes(), outputEntry)
555 if !segwit.IsP2WScript(code) {
556 return ErrNotStandardTx
562 func checkTimeRange(tx *bc.Tx, block *bc.Block) error {
563 if tx.TimeRange == 0 {
567 if tx.TimeRange < block.Height {
568 return ErrBadTimeRange
574 // ValidateTx validates a transaction.
575 func ValidateTx(tx *bc.Tx, block *bc.Block) (*GasState, error) {
576 gasStatus := &GasState{GasValid: false}
577 if block.Version == 1 && tx.Version != 1 {
578 return gasStatus, errors.WithDetailf(ErrTxVersion, "block version %d, transaction version %d", block.Version, tx.Version)
580 if tx.SerializedSize == 0 {
581 return gasStatus, ErrWrongTransactionSize
583 if err := checkTimeRange(tx, block); err != nil {
584 return gasStatus, err
586 if err := checkStandardTx(tx, block.Height); err != nil {
587 return gasStatus, err
590 vs := &validationState{
594 gasStatus: gasStatus,
595 cache: make(map[bc.Hash]error),
597 return vs.gasStatus, checkValid(vs, tx.TxHeader)