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 _, tx := range l1usertxs {
72 exitIdx, exitAccount, newExit, err := s.processL1Tx(exitTree, &tx)
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 _, tx := range l1coordinatortxs {
89 exitIdx, exitAccount, newExit, err := s.processL1Tx(exitTree, &tx)
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 _, tx := range l2txs {
109 exitIdx, exitAccount, newExit, err := s.processL2Tx(exitTree, &tx)
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 if tx.FromIdx != nil {
231 s.zki.FromIdx[s.i] = tx.FromIdx.BigInt()
232 } else {
233 s.zki.FromIdx[s.i] = big.NewInt(0)
234 }
235 s.zki.ToIdx[s.i] = tx.ToIdx.BigInt()
236 s.zki.OnChain[s.i] = big.NewInt(1)
237
238 // L1Txs
239 s.zki.LoadAmountF[s.i] = tx.LoadAmount
240 s.zki.FromEthAddr[s.i] = common.EthAddrToBigInt(tx.FromEthAddr)
241 if tx.FromBJJ != nil {
242 s.zki.FromBJJCompressed[s.i] = BJJCompressedTo256BigInts(tx.FromBJJ.Compress())
243 }
244
245 // Intermediate States
246 s.zki.ISOnChain[s.i] = big.NewInt(1)
247 }
248
249 switch tx.Type {
250 case common.TxTypeForceTransfer, common.TxTypeTransfer:
251 // go to the MT account of sender and receiver, and update balance
252 // & nonce
253 err := s.applyTransfer(tx.Tx(), 0) // 0 for the parameter toIdx, as at L1Tx ToIdx can only be 0 in the Deposit type case.
254 if err != nil {
255 return nil, nil, false, err
256 }
257 case common.TxTypeCreateAccountDeposit:
258 // add new account to the MT, update balance of the MT account
259 err := s.applyCreateAccount(tx)
260 if err != nil {
261 return nil, nil, false, err
262 }
263
264 if s.zki != nil {
265 s.zki.AuxFromIdx[s.i] = s.idx.BigInt() // last s.idx is the one used for creating the new account
266 s.zki.NewAccount[s.i] = big.NewInt(1)
267 }
268 case common.TxTypeDeposit:
269 // update balance of the MT account
270 err := s.applyDeposit(tx, false)
271 if err != nil {
272 return nil, nil, false, err
273 }
274 case common.TxTypeDepositTransfer:
275 // update balance in MT account, update balance & nonce of sender
276 // & receiver
277 err := s.applyDeposit(tx, true)
278 if err != nil {
279 return nil, nil, false, err
280 }
281 case common.TxTypeCreateAccountDepositTransfer:
282 // add new account to the merkletree, update balance in MT account,
283 // update balance & nonce of sender & receiver
284 err := s.applyCreateAccountDepositTransfer(tx)
285 if err != nil {
286 return nil, nil, false, err
287 }
288
289 if s.zki != nil {
290 s.zki.AuxFromIdx[s.i] = s.idx.BigInt() // last s.idx is the one used for creating the new account
291 s.zki.NewAccount[s.i] = big.NewInt(1)
292 }
293 case common.TxTypeExit:
294 // execute exit flow
295 exitAccount, newExit, err := s.applyExit(exitTree, tx.Tx())
296 if err != nil {
297 return nil, nil, false, err
298 }
299 return tx.FromIdx, exitAccount, newExit, nil
300 default:
301 }
302
303 return nil, nil, false, nil
304}
305
306// processL2Tx process the given L2Tx applying the needed updates to the
307// StateDB depending on the transaction Type. It returns the 3 parameters
308// related to the Exit (in case of): Idx, ExitAccount, boolean determining if
309// the Exit created a new Leaf in the ExitTree.
310func (s *StateDB) processL2Tx(exitTree *merkletree.MerkleTree, tx *common.PoolL2Tx) (*common.Idx, *common.Account, bool, error) {
311 var err error
312 var auxToIdx common.Idx
313 // if tx.ToIdx==0, get toIdx by ToEthAddr or ToBJJ
314 if tx.ToIdx == nil || *tx.ToIdx == common.Idx(0) {
315 auxToIdx, err = s.GetIdxByEthAddrBJJ(tx.ToEthAddr, tx.ToBJJ)
316 if err != nil {
317 log.Error(err)
318 return nil, nil, false, err
319 }
320 }
321
322 // ZKInputs
323 if s.zki != nil {
324 // Txs
325 // s.zki.TxCompressedData[s.i] = tx.TxCompressedData() // uncomment once L1Tx.TxCompressedData is ready
326 // s.zki.TxCompressedDataV2[s.i] = tx.TxCompressedDataV2() // uncomment once L2Tx.TxCompressedDataV2 is ready
327 s.zki.FromIdx[s.i] = tx.FromIdx.BigInt()
328 s.zki.ToIdx[s.i] = tx.ToIdx.BigInt()
329
330 // fill AuxToIdx if needed
331 if tx.ToIdx == nil {
332 // use toIdx that can have been filled by tx.ToIdx or
333 // if tx.Idx==0 (this case), toIdx is filled by the Idx
334 // from db by ToEthAddr&ToBJJ
335 s.zki.AuxToIdx[s.i] = auxToIdx.BigInt()
336 }
337
338 s.zki.ToBJJAy[s.i] = tx.ToBJJ.Y
339 if tx.ToEthAddr != nil {
340 s.zki.ToEthAddr[s.i] = common.EthAddrToBigInt(*tx.ToEthAddr)
341 } else {
342 // Not sure if this should throw an error
343 s.zki.ToEthAddr[s.i] = big.NewInt(0)
344 }
345
346 s.zki.OnChain[s.i] = big.NewInt(0)
347 s.zki.NewAccount[s.i] = big.NewInt(0)
348
349 // L2Txs
350 // s.zki.RqOffset[s.i] = // TODO Rq once TxSelector is ready
351 // s.zki.RqTxCompressedDataV2[s.i] = // TODO
352 // s.zki.RqToEthAddr[s.i] = common.EthAddrToBigInt(tx.RqToEthAddr) // TODO
353 // s.zki.RqToBJJAy[s.i] = tx.ToBJJ.Y // TODO
354 s.zki.S[s.i] = tx.Signature.S
355 s.zki.R8x[s.i] = tx.Signature.R8.X
356 s.zki.R8y[s.i] = tx.Signature.R8.Y
357 }
358
359 // if StateDB type==TypeSynchronizer, will need to add Nonce and
360 // TokenID to the transaction
361 if s.typ == TypeSynchronizer {
362 acc, err := s.GetAccount(tx.ToIdx)
363 if err != nil {
364 return nil, nil, false, err
365 }
366 tx.Nonce = acc.Nonce
367 tx.TokenID = acc.TokenID
368 }
369
370 switch tx.Type {
371 case common.TxTypeTransfer:
372 // go to the MT account of sender and receiver, and update
373 // balance & nonce
374 tmpTx, err := tx.Tx()
375 if err != nil {
376 return nil, nil, false, err
377 }
378 err = s.applyTransfer(tmpTx, auxToIdx)
379 if err != nil {
380 return nil, nil, false, err
381 }
382 case common.TxTypeExit:
383 // execute exit flow
384 tmpTx, err := tx.Tx()
385 if err != nil {
386 return nil, nil, false, err
387 }
388 exitAccount, newExit, err := s.applyExit(exitTree, tmpTx)
389 if err != nil {
390 return nil, nil, false, err
391 }
392 return &tx.FromIdx, exitAccount, newExit, nil
393 default:
394 }
395 return nil, nil, false, nil
396}
397
398// applyCreateAccount creates a new account in the account of the depositer, it
399// stores the deposit value
400func (s *StateDB) applyCreateAccount(tx *common.L1Tx) error {
401 account := &common.Account{
402 TokenID: tx.TokenID,
403 Nonce: 0,
404 Balance: tx.LoadAmount,
405 PublicKey: tx.FromBJJ,
406 EthAddr: tx.FromEthAddr,
407 }
408
409 p, err := s.CreateAccount(common.Idx(s.idx+1), account)
410 if err != nil {
411 return err
412 }
413 if s.zki != nil {
414 s.zki.TokenID1[s.i] = tx.TokenID.BigInt()
415 s.zki.Nonce1[s.i] = big.NewInt(0)
416 if babyjub.PointCoordSign(tx.FromBJJ.X) {
417 s.zki.Sign1[s.i] = big.NewInt(1)
418 }
419 s.zki.Ay1[s.i] = tx.FromBJJ.Y
420 s.zki.Balance1[s.i] = tx.LoadAmount
421 s.zki.EthAddr1[s.i] = common.EthAddrToBigInt(tx.FromEthAddr)
422 s.zki.Siblings1[s.i] = siblingsToZKInputFormat(p.Siblings)
423 if p.IsOld0 {
424 s.zki.IsOld0_1[s.i] = big.NewInt(1)
425 }
426 s.zki.OldKey1[s.i] = p.OldKey.BigInt()
427 s.zki.OldValue1[s.i] = p.OldValue.BigInt()
428 }
429
430 s.idx = s.idx + 1
431 return s.setIdx(s.idx)
432}
433
434// applyDeposit updates the balance in the account of the depositer, if
435// andTransfer parameter is set to true, the method will also apply the
436// Transfer of the L1Tx/DepositTransfer
437func (s *StateDB) applyDeposit(tx *common.L1Tx, transfer bool) error {
438 // deposit the tx.LoadAmount into the sender account
439 accSender, err := s.GetAccount(tx.FromIdx)
440 if err != nil {
441 return err
442 }
443 accSender.Balance = new(big.Int).Add(accSender.Balance, tx.LoadAmount)
444
445 // in case that the tx is a L1Tx>DepositTransfer
446 var accReceiver *common.Account
447 if transfer {
448 accReceiver, err = s.GetAccount(&tx.ToIdx)
449 if err != nil {
450 return err
451 }
452 // subtract amount to the sender
453 accSender.Balance = new(big.Int).Sub(accSender.Balance, tx.Amount)
454 // add amount to the receiver
455 accReceiver.Balance = new(big.Int).Add(accReceiver.Balance, tx.Amount)
456 }
457 // update sender account in localStateDB
458 p, err := s.UpdateAccount(tx.FromIdx, accSender)
459 if err != nil {
460 return err
461 }
462 if s.zki != nil {
463 s.zki.TokenID1[s.i] = accSender.TokenID.BigInt()
464 s.zki.Nonce1[s.i] = accSender.Nonce.BigInt()
465 if babyjub.PointCoordSign(accSender.PublicKey.X) {
466 s.zki.Sign1[s.i] = big.NewInt(1)
467 }
468 s.zki.Ay1[s.i] = accSender.PublicKey.Y
469 s.zki.Balance1[s.i] = accSender.Balance
470 s.zki.EthAddr1[s.i] = common.EthAddrToBigInt(accSender.EthAddr)
471 s.zki.Siblings1[s.i] = siblingsToZKInputFormat(p.Siblings)
472 // IsOld0_1, OldKey1, OldValue1 not needed as this is not an insert
473 }
474
475 // this is done after updating Sender Account (depositer)
476 if transfer {
477 // update receiver account in localStateDB
478 p, err := s.UpdateAccount(&tx.ToIdx, accReceiver)
479 if err != nil {
480 return err
481 }
482 if s.zki != nil {
483 s.zki.TokenID2[s.i] = accReceiver.TokenID.BigInt()
484 s.zki.Nonce2[s.i] = accReceiver.Nonce.BigInt()
485 if babyjub.PointCoordSign(accReceiver.PublicKey.X) {
486 s.zki.Sign2[s.i] = big.NewInt(1)
487 }
488 s.zki.Ay2[s.i] = accReceiver.PublicKey.Y
489 s.zki.Balance2[s.i] = accReceiver.Balance
490 s.zki.EthAddr2[s.i] = common.EthAddrToBigInt(accReceiver.EthAddr)
491 s.zki.Siblings2[s.i] = siblingsToZKInputFormat(p.Siblings)
492 // IsOld0_2, OldKey2, OldValue2 not needed as this is not an insert
493 }
494 }
495
496 return nil
497}
498
499// applyTransfer updates the balance & nonce in the account of the sender, and
500// the balance in the account of the receiver.
501// Parameter 'toIdx' should be at 0 if the tx already has tx.ToIdx!=0, if
502// tx.ToIdx==0, then toIdx!=0, and will be used the toIdx parameter as Idx of
503// the receiver. This parameter is used when the tx.ToIdx is not specified and
504// the real ToIdx is found trhrough the ToEthAddr or ToBJJ.
505func (s *StateDB) applyTransfer(tx *common.Tx, auxToIdx common.Idx) error {
506 if auxToIdx == 0 {
507 if tx.ToIdx == nil {
508 return errors.New("tx.ToIdx cannot be nil if auxToIdx is 0")
509 }
510 auxToIdx = *tx.ToIdx
511 }
512 // get sender and receiver accounts from localStateDB
513 accSender, err := s.GetAccount(tx.FromIdx)
514 if err != nil {
515 return err
516 }
517 accReceiver, err := s.GetAccount(&auxToIdx)
518 if err != nil {
519 return err
520 }
521
522 // increment nonce
523 accSender.Nonce++
524
525 // subtract amount to the sender
526 accSender.Balance = new(big.Int).Sub(accSender.Balance, tx.Amount)
527 // add amount to the receiver
528 accReceiver.Balance = new(big.Int).Add(accReceiver.Balance, tx.Amount)
529
530 // update sender account in localStateDB
531 pSender, err := s.UpdateAccount(tx.FromIdx, accSender)
532 if err != nil {
533 return err
534 }
535 if s.zki != nil {
536 s.zki.TokenID1[s.i] = accSender.TokenID.BigInt()
537 s.zki.Nonce1[s.i] = accSender.Nonce.BigInt()
538 if babyjub.PointCoordSign(accSender.PublicKey.X) {
539 s.zki.Sign1[s.i] = big.NewInt(1)
540 }
541 s.zki.Ay1[s.i] = accSender.PublicKey.Y
542 s.zki.Balance1[s.i] = accSender.Balance
543 s.zki.EthAddr1[s.i] = common.EthAddrToBigInt(accSender.EthAddr)
544 s.zki.Siblings1[s.i] = siblingsToZKInputFormat(pSender.Siblings)
545 }
546
547 // update receiver account in localStateDB
548 pReceiver, err := s.UpdateAccount(&auxToIdx, accReceiver)
549 if err != nil {
550 return err
551 }
552 if s.zki != nil {
553 s.zki.TokenID2[s.i] = accReceiver.TokenID.BigInt()
554 s.zki.Nonce2[s.i] = accReceiver.Nonce.BigInt()
555 if babyjub.PointCoordSign(accReceiver.PublicKey.X) {
556 s.zki.Sign2[s.i] = big.NewInt(1)
557 }
558 s.zki.Ay2[s.i] = accReceiver.PublicKey.Y
559 s.zki.Balance2[s.i] = accReceiver.Balance
560 s.zki.EthAddr2[s.i] = common.EthAddrToBigInt(accReceiver.EthAddr)
561 s.zki.Siblings2[s.i] = siblingsToZKInputFormat(pReceiver.Siblings)
562 }
563
564 return nil
565}
566
567// applyCreateAccountDepositTransfer, in a single tx, creates a new account,
568// makes a deposit, and performs a transfer to another account
569func (s *StateDB) applyCreateAccountDepositTransfer(tx *common.L1Tx) error {
570 accSender := &common.Account{
571 TokenID: tx.TokenID,
572 Nonce: 0,
573 Balance: tx.LoadAmount,
574 PublicKey: tx.FromBJJ,
575 EthAddr: tx.FromEthAddr,
576 }
577 accSender.Balance = new(big.Int).Add(accSender.Balance, tx.LoadAmount)
578 accReceiver, err := s.GetAccount(&tx.ToIdx)
579 if err != nil {
580 return err
581 }
582 // subtract amount to the sender
583 accSender.Balance = new(big.Int).Sub(accSender.Balance, tx.Amount)
584 // add amount to the receiver
585 accReceiver.Balance = new(big.Int).Add(accReceiver.Balance, tx.Amount)
586
587 // create Account of the Sender
588 p, err := s.CreateAccount(common.Idx(s.idx+1), accSender)
589 if err != nil {
590 return err
591 }
592 if s.zki != nil {
593 s.zki.TokenID1[s.i] = tx.TokenID.BigInt()
594 s.zki.Nonce1[s.i] = big.NewInt(0)
595 if babyjub.PointCoordSign(tx.FromBJJ.X) {
596 s.zki.Sign1[s.i] = big.NewInt(1)
597 }
598 s.zki.Ay1[s.i] = tx.FromBJJ.Y
599 s.zki.Balance1[s.i] = tx.LoadAmount
600 s.zki.EthAddr1[s.i] = common.EthAddrToBigInt(tx.FromEthAddr)
601 s.zki.Siblings1[s.i] = siblingsToZKInputFormat(p.Siblings)
602 if p.IsOld0 {
603 s.zki.IsOld0_1[s.i] = big.NewInt(1)
604 }
605 s.zki.OldKey1[s.i] = p.OldKey.BigInt()
606 s.zki.OldValue1[s.i] = p.OldValue.BigInt()
607 }
608
609 // update receiver account in localStateDB
610 p, err = s.UpdateAccount(&tx.ToIdx, accReceiver)
611 if err != nil {
612 return err
613 }
614 if s.zki != nil {
615 s.zki.TokenID2[s.i] = accReceiver.TokenID.BigInt()
616 s.zki.Nonce2[s.i] = accReceiver.Nonce.BigInt()
617 if babyjub.PointCoordSign(accReceiver.PublicKey.X) {
618 s.zki.Sign2[s.i] = big.NewInt(1)
619 }
620 s.zki.Ay2[s.i] = accReceiver.PublicKey.Y
621 s.zki.Balance2[s.i] = accReceiver.Balance
622 s.zki.EthAddr2[s.i] = common.EthAddrToBigInt(accReceiver.EthAddr)
623 s.zki.Siblings2[s.i] = siblingsToZKInputFormat(p.Siblings)
624 }
625
626 s.idx = s.idx + 1
627 return s.setIdx(s.idx)
628}
629
630// It returns the ExitAccount and a boolean determining if the Exit created a
631// new Leaf in the ExitTree.
632func (s *StateDB) applyExit(exitTree *merkletree.MerkleTree, tx *common.Tx) (*common.Account, bool, error) {
633 // 0. subtract tx.Amount from current Account in StateMT
634 // add the tx.Amount into the Account (tx.FromIdx) in the ExitMT
635 acc, err := s.GetAccount(tx.FromIdx)
636 if err != nil {
637 return nil, false, err
638 }
639 acc.Balance = new(big.Int).Sub(acc.Balance, tx.Amount)
640 p, err := s.UpdateAccount(tx.FromIdx, acc)
641 if err != nil {
642 return nil, false, err
643 }
644 if s.zki != nil {
645 s.zki.TokenID1[s.i] = acc.TokenID.BigInt()
646 s.zki.Nonce1[s.i] = acc.Nonce.BigInt()
647 if babyjub.PointCoordSign(acc.PublicKey.X) {
648 s.zki.Sign1[s.i] = big.NewInt(1)
649 }
650 s.zki.Ay1[s.i] = acc.PublicKey.Y
651 s.zki.Balance1[s.i] = acc.Balance
652 s.zki.EthAddr1[s.i] = common.EthAddrToBigInt(acc.EthAddr)
653 s.zki.Siblings1[s.i] = siblingsToZKInputFormat(p.Siblings)
654 }
655
656 if exitTree == nil {
657 return nil, false, nil
658 }
659 exitAccount, err := getAccountInTreeDB(exitTree.DB(), tx.FromIdx)
660 if err == db.ErrNotFound {
661 // 1a. if idx does not exist in exitTree:
662 // add new leaf 'ExitTreeLeaf', where ExitTreeLeaf.Balance = exitAmount (exitAmount=tx.Amount)
663 exitAccount := &common.Account{
664 TokenID: acc.TokenID,
665 Nonce: common.Nonce(1),
666 Balance: tx.Amount,
667 PublicKey: acc.PublicKey,
668 EthAddr: acc.EthAddr,
669 }
670 _, err = createAccountInTreeDB(exitTree.DB(), exitTree, tx.FromIdx, exitAccount)
671 return exitAccount, true, err
672 } else if err != nil {
673 return exitAccount, false, err
674 }
675
676 // 1b. if idx already exist in exitTree:
677 // update account, where account.Balance += exitAmount
678 exitAccount.Balance = new(big.Int).Add(exitAccount.Balance, tx.Amount)
679 _, err = updateAccountInTreeDB(exitTree.DB(), exitTree, tx.FromIdx, exitAccount)
680 return exitAccount, false, err
681}
682
683// getIdx returns the stored Idx from the localStateDB, which is the last Idx
684// used for an Account in the localStateDB.
685func (s *StateDB) getIdx() (common.Idx, error) {
686 idxBytes, err := s.DB().Get(keyidx)
687 if err == db.ErrNotFound {
688 return 0, nil
689 }
690 if err != nil {
691 return 0, err
692 }
693 return common.IdxFromBytes(idxBytes[:4])
694}
695
696// setIdx stores Idx in the localStateDB
697func (s *StateDB) setIdx(idx common.Idx) error {
698 tx, err := s.DB().NewTx()
699 if err != nil {
700 return err
701 }
702 idxBytes, err := idx.Bytes()
703 if err != nil {
704 return err
705 }
706 err = tx.Put(keyidx, idxBytes[:])
707 if err != nil {
708 return err
709 }
710 if err := tx.Commit(); err != nil {
711 return err
712 }
713 return nil
714}