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