hermez-node/db/statedb/txprocessors.go
db/statedb/txprocessors.goRaw
1package statedb
2
3import (
4 "errors"
5 "io/ioutil"
6 "math/big"
7 "os"
8
9 "github.com/hermeznetwork/hermez-node/common"
10 "github.com/hermeznetwork/hermez-node/log"
11 "github.com/iden3/go-iden3-crypto/babyjub"
12 "github.com/iden3/go-merkletree"
13 "github.com/iden3/go-merkletree/db"
14 "github.com/iden3/go-merkletree/db/pebble"
15)
16
17var (
18 // keyidx is used as key in the db to store the current Idx
19 keyidx = []byte("k:idx")
20)
21
22func (s *StateDB) resetZKInputs() {
23 s.zki = nil
24 s.i = 0 // initialize current transaction index in the ZKInputs generation
25}
26
27type processedExit struct {
28 exit bool
29 newExit bool
30 idx common.Idx
31 acc common.Account
32}
33
34// ProcessTxOutput contains the output of the ProcessTxs method
35type ProcessTxOutput struct {
36 ZKInputs *common.ZKInputs
37 ExitInfos []common.ExitInfo
38 CreatedAccounts []common.Account
39 CoordinatorIdxsMap map[common.TokenID]common.Idx
40 CollectedFees map[common.TokenID]*big.Int
41}
42
43// ProcessTxs process the given L1Txs & L2Txs applying the needed updates to
44// the StateDB depending on the transaction Type. If StateDB
45// type==TypeBatchBuilder, returns the common.ZKInputs to generate the
46// SnarkProof later used by the BatchBuilder. If StateDB
47// type==TypeSynchronizer, assumes that the call is done from the Synchronizer,
48// returns common.ExitTreeLeaf that is later used by the Synchronizer to update
49// the HistoryDB, and adds Nonce & TokenID to the L2Txs.
50// And if TypeSynchronizer returns an array of common.Account with all the
51// created accounts.
52func (s *StateDB) ProcessTxs(coordIdxs []common.Idx, l1usertxs, l1coordinatortxs []common.L1Tx, l2txs []common.PoolL2Tx) (*ProcessTxOutput, error) {
53 var err error
54 var exitTree *merkletree.MerkleTree
55 var createdAccounts []common.Account
56
57 if s.zki != nil {
58 return nil, errors.New("Expected StateDB.zki==nil, something went wrong and it's not empty")
59 }
60 defer s.resetZKInputs()
61
62 nTx := len(l1usertxs) + len(l1coordinatortxs) + len(l2txs)
63 if nTx == 0 {
64 // TODO return ZKInputs of batch without txs
65 return &ProcessTxOutput{
66 ZKInputs: nil,
67 ExitInfos: nil,
68 CreatedAccounts: nil,
69 CoordinatorIdxsMap: nil,
70 CollectedFees: nil,
71 }, nil
72 }
73 exits := make([]processedExit, nTx)
74
75 // get TokenIDs of coordIdxs
76 coordIdxsMap, err := s.getTokenIDsFromIdxs(coordIdxs)
77 if err != nil {
78 return nil, err
79 }
80
81 var collectedFees map[common.TokenID]*big.Int
82 if s.typ == TypeSynchronizer {
83 collectedFees = make(map[common.TokenID]*big.Int)
84 for tokenID := range coordIdxsMap {
85 collectedFees[tokenID] = big.NewInt(0)
86 }
87 }
88
89 if s.typ == TypeBatchBuilder {
90 s.zki = common.NewZKInputs(nTx, 24, 32) // TODO this values will be parameters of the function, taken from config file/coordinator call
91 s.zki.OldLastIdx = (s.idx - 1).BigInt()
92 s.zki.OldStateRoot = s.mt.Root().BigInt()
93 }
94
95 // TBD if ExitTree is only in memory or stored in disk, for the moment
96 // only needed in memory
97 if s.typ == TypeSynchronizer || s.typ == TypeBatchBuilder {
98 tmpDir, err := ioutil.TempDir("", "hermez-statedb-exittree")
99 if err != nil {
100 return nil, err
101 }
102 defer func() {
103 if err := os.RemoveAll(tmpDir); err != nil {
104 log.Errorw("Deleting statedb temp exit tree", "err", err)
105 }
106 }()
107 sto, err := pebble.NewPebbleStorage(tmpDir, false)
108 if err != nil {
109 return nil, err
110 }
111 exitTree, err = merkletree.NewMerkleTree(sto, s.mt.MaxLevels())
112 if err != nil {
113 return nil, err
114 }
115 }
116
117 // assumption: l1usertx are sorted by L1Tx.Position
118 for i := 0; i < len(l1usertxs); i++ {
119 exitIdx, exitAccount, newExit, createdAccount, err := s.processL1Tx(exitTree, &l1usertxs[i])
120 if err != nil {
121 return nil, err
122 }
123 if s.typ == TypeSynchronizer || s.typ == TypeBatchBuilder {
124 if exitIdx != nil && exitTree != nil {
125 exits[s.i] = processedExit{
126 exit: true,
127 newExit: newExit,
128 idx: *exitIdx,
129 acc: *exitAccount,
130 }
131 }
132 s.i++
133 }
134 if s.typ == TypeSynchronizer && createdAccount != nil {
135 createdAccounts = append(createdAccounts, *createdAccount)
136 }
137 }
138 for i := 0; i < len(l1coordinatortxs); i++ {
139 exitIdx, _, _, createdAccount, err := s.processL1Tx(exitTree, &l1coordinatortxs[i])
140 if err != nil {
141 return nil, err
142 }
143 if exitIdx != nil {
144 log.Error("Unexpected Exit in L1CoordinatorTx")
145 }
146 if s.typ == TypeSynchronizer && createdAccount != nil {
147 createdAccounts = append(createdAccounts, *createdAccount)
148 }
149 }
150 for i := 0; i < len(l2txs); i++ {
151 exitIdx, exitAccount, newExit, err := s.processL2Tx(coordIdxsMap, collectedFees, exitTree, &l2txs[i])
152 if err != nil {
153 return nil, err
154 }
155 if s.typ == TypeSynchronizer || s.typ == TypeBatchBuilder {
156 if exitIdx != nil && exitTree != nil {
157 exits[s.i] = processedExit{
158 exit: true,
159 newExit: newExit,
160 idx: *exitIdx,
161 acc: *exitAccount,
162 }
163 }
164 s.i++
165 }
166 }
167
168 if s.typ == TypeTxSelector {
169 return nil, nil
170 }
171
172 // once all txs processed (exitTree root frozen), for each Exit,
173 // generate common.ExitInfo data
174 var exitInfos []common.ExitInfo
175 // exitInfos := []common.ExitInfo{}
176 for i := 0; i < nTx; i++ {
177 if !exits[i].exit {
178 continue
179 }
180 exitIdx := exits[i].idx
181 exitAccount := exits[i].acc
182
183 // 0. generate MerkleProof
184 p, err := exitTree.GenerateCircomVerifierProof(exitIdx.BigInt(), nil)
185 if err != nil {
186 return nil, err
187 }
188 // 1. generate common.ExitInfo
189 ei := common.ExitInfo{
190 AccountIdx: exitIdx,
191 MerkleProof: p,
192 Balance: exitAccount.Balance,
193 }
194 exitInfos = append(exitInfos, ei)
195
196 if s.zki != nil {
197 s.zki.TokenID2[i] = exitAccount.TokenID.BigInt()
198 s.zki.Nonce2[i] = exitAccount.Nonce.BigInt()
199 if babyjub.PointCoordSign(exitAccount.PublicKey.X) {
200 s.zki.Sign2[i] = big.NewInt(1)
201 }
202 s.zki.Ay2[i] = exitAccount.PublicKey.Y
203 s.zki.Balance2[i] = exitAccount.Balance
204 s.zki.EthAddr2[i] = common.EthAddrToBigInt(exitAccount.EthAddr)
205 s.zki.Siblings2[i] = p.Siblings
206 if exits[i].newExit {
207 s.zki.NewExit[i] = big.NewInt(1)
208 }
209 if p.IsOld0 {
210 s.zki.IsOld0_2[i] = big.NewInt(1)
211 }
212 s.zki.OldKey2[i] = p.OldKey.BigInt()
213 s.zki.OldValue2[i] = p.OldValue.BigInt()
214 }
215 }
216 if s.typ == TypeSynchronizer {
217 // return exitInfos and createdAccounts, so Synchronizer will
218 // be able to store it into HistoryDB for the concrete BatchNum
219 return &ProcessTxOutput{
220 ZKInputs: nil,
221 ExitInfos: exitInfos,
222 CreatedAccounts: createdAccounts,
223 CoordinatorIdxsMap: coordIdxsMap,
224 CollectedFees: collectedFees,
225 }, nil
226 }
227
228 // compute last ZKInputs parameters
229 s.zki.GlobalChainID = big.NewInt(0) // TODO, 0: ethereum, this will be get from config file
230 // zki.FeeIdxs = ? // TODO, this will be get from the config file
231 tokenIDs, err := s.getTokenIDsBigInt(l1usertxs, l1coordinatortxs, l2txs)
232 if err != nil {
233 return nil, err
234 }
235 s.zki.FeePlanTokens = tokenIDs
236
237 // s.zki.ISInitStateRootFee = s.mt.Root().BigInt()
238
239 // TODO once the Node Config sets the Accounts where to send the Fees
240 // compute fees & update ZKInputs
241
242 // return ZKInputs as the BatchBuilder will return it to forge the Batch
243 return &ProcessTxOutput{
244 ZKInputs: s.zki,
245 ExitInfos: nil,
246 CreatedAccounts: nil,
247 CoordinatorIdxsMap: coordIdxsMap,
248 CollectedFees: nil,
249 }, nil
250}
251
252// getTokenIDsBigInt returns the list of TokenIDs in *big.Int format
253func (s *StateDB) getTokenIDsBigInt(l1usertxs, l1coordinatortxs []common.L1Tx, l2txs []common.PoolL2Tx) ([]*big.Int, error) {
254 tokenIDs := make(map[common.TokenID]bool)
255 for i := 0; i < len(l1usertxs); i++ {
256 tokenIDs[l1usertxs[i].TokenID] = true
257 }
258 for i := 0; i < len(l1coordinatortxs); i++ {
259 tokenIDs[l1coordinatortxs[i].TokenID] = true
260 }
261 for i := 0; i < len(l2txs); i++ {
262 // as L2Tx does not have parameter TokenID, get it from the
263 // AccountsDB (in the StateDB)
264 acc, err := s.GetAccount(l2txs[i].ToIdx)
265 if err != nil {
266 return nil, err
267 }
268 tokenIDs[acc.TokenID] = true
269 }
270 var tBI []*big.Int
271 for t := range tokenIDs {
272 tBI = append(tBI, t.BigInt())
273 }
274 return tBI, nil
275}
276
277// processL1Tx process the given L1Tx applying the needed updates to the
278// StateDB depending on the transaction Type. It returns the 3 parameters
279// related to the Exit (in case of): Idx, ExitAccount, boolean determining if
280// the Exit created a new Leaf in the ExitTree.
281// And another *common.Account parameter which contains the created account in
282// case that has been a new created account and that the StateDB is of type
283// TypeSynchronizer.
284func (s *StateDB) processL1Tx(exitTree *merkletree.MerkleTree, tx *common.L1Tx) (*common.Idx, *common.Account, bool, *common.Account, error) {
285 // ZKInputs
286 if s.zki != nil {
287 // Txs
288 // s.zki.TxCompressedData[s.i] = tx.TxCompressedData() // uncomment once L1Tx.TxCompressedData is ready
289 s.zki.FromIdx[s.i] = tx.FromIdx.BigInt()
290 s.zki.ToIdx[s.i] = tx.ToIdx.BigInt()
291 s.zki.OnChain[s.i] = big.NewInt(1)
292
293 // L1Txs
294 s.zki.LoadAmountF[s.i] = tx.LoadAmount
295 s.zki.FromEthAddr[s.i] = common.EthAddrToBigInt(tx.FromEthAddr)
296 if tx.FromBJJ != nil {
297 s.zki.FromBJJCompressed[s.i] = BJJCompressedTo256BigInts(tx.FromBJJ.Compress())
298 }
299
300 // Intermediate States
301 s.zki.ISOnChain[s.i] = big.NewInt(1)
302 }
303
304 switch tx.Type {
305 case common.TxTypeForceTransfer:
306 // go to the MT account of sender and receiver, and update balance
307 // & nonce
308
309 // coordIdxsMap is 'nil', as at L1Txs there is no L2 fees
310 // 0 for the parameter toIdx, as at L1Tx ToIdx can only be 0 in the Deposit type case.
311 err := s.applyTransfer(nil, nil, tx.Tx(), 0)
312 if err != nil {
313 log.Error(err)
314 return nil, nil, false, nil, err
315 }
316 case common.TxTypeCreateAccountDeposit:
317 // add new account to the MT, update balance of the MT account
318 err := s.applyCreateAccount(tx)
319 if err != nil {
320 log.Error(err)
321 return nil, nil, false, nil, err
322 }
323 // TODO applyCreateAccount will return the created account,
324 // which in the case type==TypeSynchronizer will be added to an
325 // array of created accounts that will be returned
326
327 if s.zki != nil {
328 s.zki.AuxFromIdx[s.i] = s.idx.BigInt() // last s.idx is the one used for creating the new account
329 s.zki.NewAccount[s.i] = big.NewInt(1)
330 }
331 case common.TxTypeDeposit:
332 // update balance of the MT account
333 err := s.applyDeposit(tx, false)
334 if err != nil {
335 log.Error(err)
336 return nil, nil, false, nil, err
337 }
338 case common.TxTypeDepositTransfer:
339 // update balance in MT account, update balance & nonce of sender
340 // & receiver
341 err := s.applyDeposit(tx, true)
342 if err != nil {
343 log.Error(err)
344 return nil, nil, false, nil, err
345 }
346 case common.TxTypeCreateAccountDepositTransfer:
347 // add new account to the merkletree, update balance in MT account,
348 // update balance & nonce of sender & receiver
349 err := s.applyCreateAccountDepositTransfer(tx)
350 if err != nil {
351 log.Error(err)
352 return nil, nil, false, nil, err
353 }
354
355 if s.zki != nil {
356 s.zki.AuxFromIdx[s.i] = s.idx.BigInt() // last s.idx is the one used for creating the new account
357 s.zki.NewAccount[s.i] = big.NewInt(1)
358 }
359 case common.TxTypeForceExit:
360 // execute exit flow
361 // coordIdxsMap is 'nil', as at L1Txs there is no L2 fees
362 exitAccount, newExit, err := s.applyExit(nil, nil, exitTree, tx.Tx())
363 if err != nil {
364 log.Error(err)
365 return nil, nil, false, nil, err
366 }
367 return &tx.FromIdx, exitAccount, newExit, nil, nil
368 default:
369 }
370
371 var createdAccount *common.Account
372 if s.typ == TypeSynchronizer && (tx.Type == common.TxTypeCreateAccountDeposit || tx.Type == common.TxTypeCreateAccountDepositTransfer) {
373 var err error
374 createdAccount, err = s.GetAccount(s.idx)
375 if err != nil {
376 log.Error(err)
377 return nil, nil, false, nil, err
378 }
379 }
380
381 return nil, nil, false, createdAccount, nil
382}
383
384// processL2Tx process the given L2Tx applying the needed updates to the
385// StateDB depending on the transaction Type. It returns the 3 parameters
386// related to the Exit (in case of): Idx, ExitAccount, boolean determining if
387// the Exit created a new Leaf in the ExitTree.
388func (s *StateDB) processL2Tx(coordIdxsMap map[common.TokenID]common.Idx, collectedFees map[common.TokenID]*big.Int,
389 exitTree *merkletree.MerkleTree, tx *common.PoolL2Tx) (*common.Idx, *common.Account, bool, error) {
390 var err error
391 // if tx.ToIdx==0, get toIdx by ToEthAddr or ToBJJ
392 if tx.ToIdx == common.Idx(0) && tx.AuxToIdx == common.Idx(0) {
393 // case when tx.Type== common.TxTypeTransferToEthAddr or common.TxTypeTransferToBJJ
394 tx.AuxToIdx, err = s.GetIdxByEthAddrBJJ(tx.ToEthAddr, tx.ToBJJ, tx.TokenID)
395 if err != nil {
396 log.Error(err)
397 return nil, nil, false, err
398 }
399 }
400
401 // ZKInputs
402 if s.zki != nil {
403 // Txs
404 // s.zki.TxCompressedData[s.i] = tx.TxCompressedData() // uncomment once L1Tx.TxCompressedData is ready
405 // s.zki.TxCompressedDataV2[s.i] = tx.TxCompressedDataV2() // uncomment once L2Tx.TxCompressedDataV2 is ready
406 s.zki.FromIdx[s.i] = tx.FromIdx.BigInt()
407 s.zki.ToIdx[s.i] = tx.ToIdx.BigInt()
408
409 // fill AuxToIdx if needed
410 if tx.ToIdx == 0 {
411 // use toIdx that can have been filled by tx.ToIdx or
412 // if tx.Idx==0 (this case), toIdx is filled by the Idx
413 // from db by ToEthAddr&ToBJJ
414 s.zki.AuxToIdx[s.i] = tx.AuxToIdx.BigInt()
415 }
416
417 if tx.ToBJJ != nil {
418 s.zki.ToBJJAy[s.i] = tx.ToBJJ.Y
419 }
420 s.zki.ToEthAddr[s.i] = common.EthAddrToBigInt(tx.ToEthAddr)
421
422 s.zki.OnChain[s.i] = big.NewInt(0)
423 s.zki.NewAccount[s.i] = big.NewInt(0)
424
425 // L2Txs
426 // s.zki.RqOffset[s.i] = // TODO Rq once TxSelector is ready
427 // s.zki.RqTxCompressedDataV2[s.i] = // TODO
428 // s.zki.RqToEthAddr[s.i] = common.EthAddrToBigInt(tx.RqToEthAddr) // TODO
429 // s.zki.RqToBJJAy[s.i] = tx.ToBJJ.Y // TODO
430 signature, err := tx.Signature.Decompress()
431 if err != nil {
432 log.Error(err)
433 return nil, nil, false, err
434 }
435 s.zki.S[s.i] = signature.S
436 s.zki.R8x[s.i] = signature.R8.X
437 s.zki.R8y[s.i] = signature.R8.Y
438 }
439
440 // if StateDB type==TypeSynchronizer, will need to add Nonce
441 if s.typ == TypeSynchronizer {
442 // as type==TypeSynchronizer, always tx.ToIdx!=0
443 acc, err := s.GetAccount(tx.FromIdx)
444 if err != nil {
445 log.Errorw("GetAccount", "fromIdx", tx.FromIdx, "err", err)
446 return nil, nil, false, err
447 }
448 tx.Nonce = acc.Nonce + 1
449 tx.TokenID = acc.TokenID
450 }
451
452 switch tx.Type {
453 case common.TxTypeTransfer, common.TxTypeTransferToEthAddr, common.TxTypeTransferToBJJ:
454 // go to the MT account of sender and receiver, and update
455 // balance & nonce
456 err = s.applyTransfer(coordIdxsMap, collectedFees, tx.Tx(), tx.AuxToIdx)
457 if err != nil {
458 log.Error(err)
459 return nil, nil, false, err
460 }
461 case common.TxTypeExit:
462 // execute exit flow
463 exitAccount, newExit, err := s.applyExit(coordIdxsMap, collectedFees, exitTree, tx.Tx())
464 if err != nil {
465 log.Error(err)
466 return nil, nil, false, err
467 }
468 return &tx.FromIdx, exitAccount, newExit, nil
469 default:
470 }
471 return nil, nil, false, nil
472}
473
474// applyCreateAccount creates a new account in the account of the depositer, it
475// stores the deposit value
476func (s *StateDB) applyCreateAccount(tx *common.L1Tx) error {
477 account := &common.Account{
478 TokenID: tx.TokenID,
479 Nonce: 0,
480 Balance: tx.LoadAmount,
481 PublicKey: tx.FromBJJ,
482 EthAddr: tx.FromEthAddr,
483 }
484
485 p, err := s.CreateAccount(common.Idx(s.idx+1), account)
486 if err != nil {
487 return err
488 }
489 if s.zki != nil {
490 s.zki.TokenID1[s.i] = tx.TokenID.BigInt()
491 s.zki.Nonce1[s.i] = big.NewInt(0)
492 if babyjub.PointCoordSign(tx.FromBJJ.X) {
493 s.zki.Sign1[s.i] = big.NewInt(1)
494 }
495 s.zki.Ay1[s.i] = tx.FromBJJ.Y
496 s.zki.Balance1[s.i] = tx.LoadAmount
497 s.zki.EthAddr1[s.i] = common.EthAddrToBigInt(tx.FromEthAddr)
498 s.zki.Siblings1[s.i] = siblingsToZKInputFormat(p.Siblings)
499 if p.IsOld0 {
500 s.zki.IsOld0_1[s.i] = big.NewInt(1)
501 }
502 s.zki.OldKey1[s.i] = p.OldKey.BigInt()
503 s.zki.OldValue1[s.i] = p.OldValue.BigInt()
504 }
505
506 s.idx = s.idx + 1
507 return s.setIdx(s.idx)
508}
509
510// applyDeposit updates the balance in the account of the depositer, if
511// andTransfer parameter is set to true, the method will also apply the
512// Transfer of the L1Tx/DepositTransfer
513func (s *StateDB) applyDeposit(tx *common.L1Tx, transfer bool) error {
514 // deposit the tx.LoadAmount into the sender account
515 accSender, err := s.GetAccount(tx.FromIdx)
516 if err != nil {
517 return err
518 }
519 accSender.Balance = new(big.Int).Add(accSender.Balance, tx.LoadAmount)
520
521 // in case that the tx is a L1Tx>DepositTransfer
522 var accReceiver *common.Account
523 if transfer {
524 accReceiver, err = s.GetAccount(tx.ToIdx)
525 if err != nil {
526 return err
527 }
528 // subtract amount to the sender
529 accSender.Balance = new(big.Int).Sub(accSender.Balance, tx.Amount)
530 // add amount to the receiver
531 accReceiver.Balance = new(big.Int).Add(accReceiver.Balance, tx.Amount)
532 }
533 // update sender account in localStateDB
534 p, err := s.UpdateAccount(tx.FromIdx, accSender)
535 if err != nil {
536 return err
537 }
538 if s.zki != nil {
539 s.zki.TokenID1[s.i] = accSender.TokenID.BigInt()
540 s.zki.Nonce1[s.i] = accSender.Nonce.BigInt()
541 if babyjub.PointCoordSign(accSender.PublicKey.X) {
542 s.zki.Sign1[s.i] = big.NewInt(1)
543 }
544 s.zki.Ay1[s.i] = accSender.PublicKey.Y
545 s.zki.Balance1[s.i] = accSender.Balance
546 s.zki.EthAddr1[s.i] = common.EthAddrToBigInt(accSender.EthAddr)
547 s.zki.Siblings1[s.i] = siblingsToZKInputFormat(p.Siblings)
548 // IsOld0_1, OldKey1, OldValue1 not needed as this is not an insert
549 }
550
551 // this is done after updating Sender Account (depositer)
552 if transfer {
553 // update receiver account in localStateDB
554 p, err := s.UpdateAccount(tx.ToIdx, accReceiver)
555 if err != nil {
556 return err
557 }
558 if s.zki != nil {
559 s.zki.TokenID2[s.i] = accReceiver.TokenID.BigInt()
560 s.zki.Nonce2[s.i] = accReceiver.Nonce.BigInt()
561 if babyjub.PointCoordSign(accReceiver.PublicKey.X) {
562 s.zki.Sign2[s.i] = big.NewInt(1)
563 }
564 s.zki.Ay2[s.i] = accReceiver.PublicKey.Y
565 s.zki.Balance2[s.i] = accReceiver.Balance
566 s.zki.EthAddr2[s.i] = common.EthAddrToBigInt(accReceiver.EthAddr)
567 s.zki.Siblings2[s.i] = siblingsToZKInputFormat(p.Siblings)
568 // IsOld0_2, OldKey2, OldValue2 not needed as this is not an insert
569 }
570 }
571
572 return nil
573}
574
575// applyTransfer updates the balance & nonce in the account of the sender, and
576// the balance in the account of the receiver.
577// Parameter 'toIdx' should be at 0 if the tx already has tx.ToIdx!=0, if
578// tx.ToIdx==0, then toIdx!=0, and will be used the toIdx parameter as Idx of
579// the receiver. This parameter is used when the tx.ToIdx is not specified and
580// the real ToIdx is found trhrough the ToEthAddr or ToBJJ.
581func (s *StateDB) applyTransfer(coordIdxsMap map[common.TokenID]common.Idx, collectedFees map[common.TokenID]*big.Int,
582 tx common.Tx, auxToIdx common.Idx) error {
583 if auxToIdx == common.Idx(0) {
584 auxToIdx = tx.ToIdx
585 }
586 // get sender and receiver accounts from localStateDB
587 accSender, err := s.GetAccount(tx.FromIdx)
588 if err != nil {
589 log.Error(err)
590 return err
591 }
592 accReceiver, err := s.GetAccount(auxToIdx)
593 if err != nil {
594 log.Error(err)
595 return err
596 }
597
598 // increment nonce
599 accSender.Nonce++
600
601 if !tx.IsL1 {
602 // compute fee and subtract it from the accSender
603 fee := common.CalcFeeAmount(tx.Amount, *tx.Fee)
604 feeAndAmount := new(big.Int).Add(tx.Amount, fee)
605 accSender.Balance = new(big.Int).Sub(accSender.Balance, feeAndAmount)
606 // send the fee to the Idx of the Coordinator for the TokenID
607 accCoord, err := s.GetAccount(coordIdxsMap[tx.TokenID])
608 if err != nil {
609 log.Debugw("No coord Idx to receive fee", "tx", tx)
610 } else {
611 accCoord.Balance = new(big.Int).Add(accCoord.Balance, fee)
612 _, err = s.UpdateAccount(coordIdxsMap[tx.TokenID], accCoord)
613 if err != nil {
614 log.Error(err)
615 return err
616 }
617 if s.typ == TypeSynchronizer {
618 collected := collectedFees[tx.TokenID]
619 collected.Add(collected, fee)
620 }
621 }
622 }
623
624 // add amount-feeAmount to the receiver
625 accReceiver.Balance = new(big.Int).Add(accReceiver.Balance, tx.Amount)
626
627 // update sender account in localStateDB
628 pSender, err := s.UpdateAccount(tx.FromIdx, accSender)
629 if err != nil {
630 log.Error(err)
631 return err
632 }
633 if s.zki != nil {
634 s.zki.TokenID1[s.i] = accSender.TokenID.BigInt()
635 s.zki.Nonce1[s.i] = accSender.Nonce.BigInt()
636 if babyjub.PointCoordSign(accSender.PublicKey.X) {
637 s.zki.Sign1[s.i] = big.NewInt(1)
638 }
639 s.zki.Ay1[s.i] = accSender.PublicKey.Y
640 s.zki.Balance1[s.i] = accSender.Balance
641 s.zki.EthAddr1[s.i] = common.EthAddrToBigInt(accSender.EthAddr)
642 s.zki.Siblings1[s.i] = siblingsToZKInputFormat(pSender.Siblings)
643 }
644
645 // update receiver account in localStateDB
646 pReceiver, err := s.UpdateAccount(auxToIdx, accReceiver)
647 if err != nil {
648 return err
649 }
650 if s.zki != nil {
651 s.zki.TokenID2[s.i] = accReceiver.TokenID.BigInt()
652 s.zki.Nonce2[s.i] = accReceiver.Nonce.BigInt()
653 if babyjub.PointCoordSign(accReceiver.PublicKey.X) {
654 s.zki.Sign2[s.i] = big.NewInt(1)
655 }
656 s.zki.Ay2[s.i] = accReceiver.PublicKey.Y
657 s.zki.Balance2[s.i] = accReceiver.Balance
658 s.zki.EthAddr2[s.i] = common.EthAddrToBigInt(accReceiver.EthAddr)
659 s.zki.Siblings2[s.i] = siblingsToZKInputFormat(pReceiver.Siblings)
660 }
661
662 return nil
663}
664
665// applyCreateAccountDepositTransfer, in a single tx, creates a new account,
666// makes a deposit, and performs a transfer to another account
667func (s *StateDB) applyCreateAccountDepositTransfer(tx *common.L1Tx) error {
668 accSender := &common.Account{
669 TokenID: tx.TokenID,
670 Nonce: 0,
671 Balance: tx.LoadAmount,
672 PublicKey: tx.FromBJJ,
673 EthAddr: tx.FromEthAddr,
674 }
675 accSender.Balance = new(big.Int).Add(accSender.Balance, tx.LoadAmount)
676 accReceiver, err := s.GetAccount(tx.ToIdx)
677 if err != nil {
678 return err
679 }
680 // subtract amount to the sender
681 accSender.Balance = new(big.Int).Sub(accSender.Balance, tx.Amount)
682 // add amount to the receiver
683 accReceiver.Balance = new(big.Int).Add(accReceiver.Balance, tx.Amount)
684
685 // create Account of the Sender
686 p, err := s.CreateAccount(common.Idx(s.idx+1), accSender)
687 if err != nil {
688 return err
689 }
690 if s.zki != nil {
691 s.zki.TokenID1[s.i] = tx.TokenID.BigInt()
692 s.zki.Nonce1[s.i] = big.NewInt(0)
693 if babyjub.PointCoordSign(tx.FromBJJ.X) {
694 s.zki.Sign1[s.i] = big.NewInt(1)
695 }
696 s.zki.Ay1[s.i] = tx.FromBJJ.Y
697 s.zki.Balance1[s.i] = tx.LoadAmount
698 s.zki.EthAddr1[s.i] = common.EthAddrToBigInt(tx.FromEthAddr)
699 s.zki.Siblings1[s.i] = siblingsToZKInputFormat(p.Siblings)
700 if p.IsOld0 {
701 s.zki.IsOld0_1[s.i] = big.NewInt(1)
702 }
703 s.zki.OldKey1[s.i] = p.OldKey.BigInt()
704 s.zki.OldValue1[s.i] = p.OldValue.BigInt()
705 }
706
707 // update receiver account in localStateDB
708 p, err = s.UpdateAccount(tx.ToIdx, accReceiver)
709 if err != nil {
710 return err
711 }
712 if s.zki != nil {
713 s.zki.TokenID2[s.i] = accReceiver.TokenID.BigInt()
714 s.zki.Nonce2[s.i] = accReceiver.Nonce.BigInt()
715 if babyjub.PointCoordSign(accReceiver.PublicKey.X) {
716 s.zki.Sign2[s.i] = big.NewInt(1)
717 }
718 s.zki.Ay2[s.i] = accReceiver.PublicKey.Y
719 s.zki.Balance2[s.i] = accReceiver.Balance
720 s.zki.EthAddr2[s.i] = common.EthAddrToBigInt(accReceiver.EthAddr)
721 s.zki.Siblings2[s.i] = siblingsToZKInputFormat(p.Siblings)
722 }
723
724 s.idx = s.idx + 1
725 return s.setIdx(s.idx)
726}
727
728// It returns the ExitAccount and a boolean determining if the Exit created a
729// new Leaf in the ExitTree.
730func (s *StateDB) applyExit(coordIdxsMap map[common.TokenID]common.Idx, collectedFees map[common.TokenID]*big.Int,
731 exitTree *merkletree.MerkleTree, tx common.Tx) (*common.Account, bool, error) {
732 // 0. subtract tx.Amount from current Account in StateMT
733 // add the tx.Amount into the Account (tx.FromIdx) in the ExitMT
734 acc, err := s.GetAccount(tx.FromIdx)
735 if err != nil {
736 return nil, false, err
737 }
738
739 if !tx.IsL1 {
740 // compute fee and subtract it from the accSender
741 fee := common.CalcFeeAmount(tx.Amount, *tx.Fee)
742 feeAndAmount := new(big.Int).Add(tx.Amount, fee)
743 acc.Balance = new(big.Int).Sub(acc.Balance, feeAndAmount)
744
745 // send the fee to the Idx of the Coordinator for the TokenID
746 accCoord, err := s.GetAccount(coordIdxsMap[tx.TokenID])
747 if err != nil {
748 log.Debugw("No coord Idx to receive fee", "tx", tx)
749 } else {
750 accCoord.Balance = new(big.Int).Add(accCoord.Balance, fee)
751 _, err = s.UpdateAccount(coordIdxsMap[tx.TokenID], accCoord)
752 if err != nil {
753 log.Error(err)
754 return nil, false, err
755 }
756 if s.typ == TypeSynchronizer {
757 collected := collectedFees[tx.TokenID]
758 collected.Add(collected, fee)
759 }
760 }
761 }
762
763 p, err := s.UpdateAccount(tx.FromIdx, acc)
764 if err != nil {
765 return nil, false, err
766 }
767 if s.zki != nil {
768 s.zki.TokenID1[s.i] = acc.TokenID.BigInt()
769 s.zki.Nonce1[s.i] = acc.Nonce.BigInt()
770 if babyjub.PointCoordSign(acc.PublicKey.X) {
771 s.zki.Sign1[s.i] = big.NewInt(1)
772 }
773 s.zki.Ay1[s.i] = acc.PublicKey.Y
774 s.zki.Balance1[s.i] = acc.Balance
775 s.zki.EthAddr1[s.i] = common.EthAddrToBigInt(acc.EthAddr)
776 s.zki.Siblings1[s.i] = siblingsToZKInputFormat(p.Siblings)
777 }
778
779 if exitTree == nil {
780 return nil, false, nil
781 }
782 exitAccount, err := getAccountInTreeDB(exitTree.DB(), tx.FromIdx)
783 if err == db.ErrNotFound {
784 // 1a. if idx does not exist in exitTree:
785 // add new leaf 'ExitTreeLeaf', where ExitTreeLeaf.Balance = exitAmount (exitAmount=tx.Amount)
786 exitAccount := &common.Account{
787 TokenID: acc.TokenID,
788 Nonce: common.Nonce(1),
789 Balance: tx.Amount,
790 PublicKey: acc.PublicKey,
791 EthAddr: acc.EthAddr,
792 }
793 _, err = createAccountInTreeDB(exitTree.DB(), exitTree, tx.FromIdx, exitAccount)
794 return exitAccount, true, err
795 } else if err != nil {
796 return exitAccount, false, err
797 }
798
799 // 1b. if idx already exist in exitTree:
800 // update account, where account.Balance += exitAmount
801 exitAccount.Balance = new(big.Int).Add(exitAccount.Balance, tx.Amount)
802 _, err = updateAccountInTreeDB(exitTree.DB(), exitTree, tx.FromIdx, exitAccount)
803 return exitAccount, false, err
804}
805
806// getIdx returns the stored Idx from the localStateDB, which is the last Idx
807// used for an Account in the localStateDB.
808func (s *StateDB) getIdx() (common.Idx, error) {
809 idxBytes, err := s.DB().Get(keyidx)
810 if err == db.ErrNotFound {
811 return 0, nil
812 }
813 if err != nil {
814 return 0, err
815 }
816 return common.IdxFromBytes(idxBytes[:4])
817}
818
819// setIdx stores Idx in the localStateDB
820func (s *StateDB) setIdx(idx common.Idx) error {
821 tx, err := s.DB().NewTx()
822 if err != nil {
823 return err
824 }
825 idxBytes, err := idx.Bytes()
826 if err != nil {
827 return err
828 }
829 err = tx.Put(keyidx, idxBytes[:])
830 if err != nil {
831 return err
832 }
833 if err := tx.Commit(); err != nil {
834 return err
835 }
836 return nil
837}