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