hermez-node/txselector/txselector.go
txselector/txselector.goRaw
1package txselector
2
3// current: very simple version of TxSelector
4
5import (
6 "fmt"
7 "math/big"
8 "sort"
9
10 ethCommon "github.com/ethereum/go-ethereum/common"
11 "github.com/hermeznetwork/hermez-node/common"
12 "github.com/hermeznetwork/hermez-node/db/kvdb"
13 "github.com/hermeznetwork/hermez-node/db/l2db"
14 "github.com/hermeznetwork/hermez-node/db/statedb"
15 "github.com/hermeznetwork/hermez-node/log"
16 "github.com/hermeznetwork/hermez-node/txprocessor"
17 "github.com/hermeznetwork/tracerr"
18 "github.com/iden3/go-iden3-crypto/babyjub"
19)
20
21// txs implements the interface Sort for an array of Tx, and sorts the txs by
22// absolute fee
23type txs []common.PoolL2Tx
24
25func (t txs) Len() int {
26 return len(t)
27}
28func (t txs) Swap(i, j int) {
29 t[i], t[j] = t[j], t[i]
30}
31func (t txs) Less(i, j int) bool {
32 return t[i].AbsoluteFee > t[j].AbsoluteFee
33}
34
35// CoordAccount contains the data of the Coordinator account, that will be used
36// to create new transactions of CreateAccountDeposit type to add new TokenID
37// accounts for the Coordinator to receive the fees.
38type CoordAccount struct {
39 Addr ethCommon.Address
40 BJJ babyjub.PublicKeyComp
41 AccountCreationAuth []byte // signature in byte array format
42}
43
44// SelectionConfig contains the parameters of configuration of the selection of
45// transactions for the next batch
46type SelectionConfig struct {
47 // MaxL1UserTxs is the maximum L1-user-tx for a batch
48 MaxL1UserTxs uint64
49
50 // TxProcessorConfig contains the config for ProcessTxs
51 TxProcessorConfig txprocessor.Config
52}
53
54// TxSelector implements all the functionalities to select the txs for the next
55// batch
56type TxSelector struct {
57 l2db *l2db.L2DB
58 localAccountsDB *statedb.LocalStateDB
59
60 coordAccount *CoordAccount
61}
62
63// NewTxSelector returns a *TxSelector
64func NewTxSelector(coordAccount *CoordAccount, dbpath string,
65 synchronizerStateDB *statedb.StateDB, l2 *l2db.L2DB) (*TxSelector, error) {
66 localAccountsDB, err := statedb.NewLocalStateDB(
67 statedb.Config{
68 Path: dbpath,
69 Keep: kvdb.DefaultKeep,
70 Type: statedb.TypeTxSelector,
71 NLevels: 0,
72 },
73 synchronizerStateDB) // without merkletree
74 if err != nil {
75 return nil, tracerr.Wrap(err)
76 }
77
78 return &TxSelector{
79 l2db: l2,
80 localAccountsDB: localAccountsDB,
81 coordAccount: coordAccount,
82 }, nil
83}
84
85// LocalAccountsDB returns the LocalStateDB of the TxSelector
86func (txsel *TxSelector) LocalAccountsDB() *statedb.LocalStateDB {
87 return txsel.localAccountsDB
88}
89
90// Reset tells the TxSelector to get it's internal AccountsDB
91// from the required `batchNum`
92func (txsel *TxSelector) Reset(batchNum common.BatchNum, fromSynchronizer bool) error {
93 return tracerr.Wrap(txsel.localAccountsDB.Reset(batchNum, fromSynchronizer))
94}
95
96func (txsel *TxSelector) getCoordIdx(tokenID common.TokenID) (common.Idx, error) {
97 return txsel.localAccountsDB.GetIdxByEthAddrBJJ(txsel.coordAccount.Addr,
98 txsel.coordAccount.BJJ, tokenID)
99}
100
101// coordAccountForTokenID creates a new L1CoordinatorTx to create a new
102// Coordinator account for the given TokenID in the case that the account does
103// not exist yet in the db, and does not exist a L1CoordinatorTx to creat that
104// account in the given array of L1CoordinatorTxs. If a new Coordinator account
105// needs to be created, a new L1CoordinatorTx will be returned from this
106// function. After calling this method, if the l1CoordinatorTx is added to the
107// selection, positionL1 must be increased 1.
108func (txsel *TxSelector) coordAccountForTokenID(l1CoordinatorTxs []common.L1Tx,
109 tokenID common.TokenID, positionL1 int) (*common.L1Tx, int, error) {
110 // check if CoordinatorAccount for TokenID is already pending to create
111 if checkAlreadyPendingToCreate(l1CoordinatorTxs, tokenID,
112 txsel.coordAccount.Addr, txsel.coordAccount.BJJ) {
113 return nil, positionL1, nil
114 }
115 _, err := txsel.getCoordIdx(tokenID)
116 if tracerr.Unwrap(err) == statedb.ErrIdxNotFound {
117 // create L1CoordinatorTx to create new CoordAccount for
118 // TokenID
119 l1CoordinatorTx := common.L1Tx{
120 Position: positionL1,
121 UserOrigin: false,
122 FromEthAddr: txsel.coordAccount.Addr,
123 FromBJJ: txsel.coordAccount.BJJ,
124 TokenID: tokenID,
125 Amount: big.NewInt(0),
126 DepositAmount: big.NewInt(0),
127 Type: common.TxTypeCreateAccountDeposit,
128 }
129
130 return &l1CoordinatorTx, positionL1, nil
131 }
132 if err != nil {
133 return nil, positionL1, tracerr.Wrap(err)
134 }
135 // CoordAccount for TokenID already exists
136 return nil, positionL1, nil
137}
138
139// GetL2TxSelection returns the L1CoordinatorTxs and a selection of the L2Txs
140// for the next batch, from the L2DB pool.
141// It returns: the CoordinatorIdxs used to receive the fees of the selected
142// L2Txs. An array of bytearrays with the signatures of the
143// AccountCreationAuthorization of the accounts of the users created by the
144// Coordinator with L1CoordinatorTxs of those accounts that does not exist yet
145// but there is a transactions to them and the authorization of account
146// creation exists. The L1UserTxs, L1CoordinatorTxs, PoolL2Txs that will be
147// included in the next batch.
148func (txsel *TxSelector) GetL2TxSelection(selectionConfig *SelectionConfig) ([]common.Idx,
149 [][]byte, []common.L1Tx, []common.PoolL2Tx, []common.PoolL2Tx, error) {
150 coordIdxs, accCreationAuths, _, l1CoordinatorTxs, l2Txs, discardedL2Txs, err :=
151 txsel.GetL1L2TxSelection(selectionConfig, []common.L1Tx{})
152 return coordIdxs, accCreationAuths, l1CoordinatorTxs, l2Txs, discardedL2Txs, tracerr.Wrap(err)
153}
154
155// GetL1L2TxSelection returns the selection of L1 + L2 txs.
156// It returns: the CoordinatorIdxs used to receive the fees of the selected
157// L2Txs. An array of bytearrays with the signatures of the
158// AccountCreationAuthorization of the accounts of the users created by the
159// Coordinator with L1CoordinatorTxs of those accounts that does not exist yet
160// but there is a transactions to them and the authorization of account
161// creation exists. The L1UserTxs, L1CoordinatorTxs, PoolL2Txs that will be
162// included in the next batch.
163func (txsel *TxSelector) GetL1L2TxSelection(selectionConfig *SelectionConfig,
164 l1UserTxs []common.L1Tx) ([]common.Idx, [][]byte, []common.L1Tx,
165 []common.L1Tx, []common.PoolL2Tx, []common.PoolL2Tx, error) {
166 // WIP.0: the TxSelector is not optimized and will need a redesign. The
167 // current version is implemented in order to have a functional
168 // implementation that can be used asap.
169 //
170 // WIP.1: this method uses a 'cherry-pick' of internal calls of the
171 // StateDB, a refactor of the StateDB to reorganize it internally is
172 // planned once the main functionallities are covered, with that
173 // refactor the TxSelector will be updated also.
174
175 // get pending l2-tx from tx-pool
176 l2TxsRaw, err := txsel.l2db.GetPendingTxs()
177 if err != nil {
178 return nil, nil, nil, nil, nil, nil, tracerr.Wrap(err)
179 }
180
181 txselStateDB := txsel.localAccountsDB.StateDB
182 tp := txprocessor.NewTxProcessor(txselStateDB, selectionConfig.TxProcessorConfig)
183
184 // Process L1UserTxs
185 for i := 0; i < len(l1UserTxs); i++ {
186 // assumption: l1usertx are sorted by L1Tx.Position
187 _, _, _, _, err := tp.ProcessL1Tx(nil, &l1UserTxs[i])
188 if err != nil {
189 return nil, nil, nil, nil, nil, nil, tracerr.Wrap(err)
190 }
191 }
192
193 // discardedL2Txs contains an array of the L2Txs that have not been selected in this Batch
194 var discardedL2Txs []common.PoolL2Tx
195
196 var l1CoordinatorTxs []common.L1Tx
197 positionL1 := len(l1UserTxs)
198 var accAuths [][]byte
199
200 // sort l2TxsRaw (cropping at MaxTx at this point)
201 l2Txs0 := txsel.getL2Profitable(l2TxsRaw, selectionConfig.TxProcessorConfig.MaxTx)
202
203 noncesMap := make(map[common.Idx]common.Nonce)
204 var l2Txs []common.PoolL2Tx
205 // iterate over l2Txs
206 // - if tx.TokenID does not exist at CoordsIdxDB
207 // - create new L1CoordinatorTx creating a CoordAccount, for
208 // Coordinator to receive the fee of the new TokenID
209 for i := 0; i < len(l2Txs0); i++ {
210 accSender, err := tp.StateDB().GetAccount(l2Txs0[i].FromIdx)
211 if err != nil {
212 return nil, nil, nil, nil, nil, nil, tracerr.Wrap(err)
213 }
214 l2Txs0[i].TokenID = accSender.TokenID
215 // populate the noncesMap used at the next iteration
216 noncesMap[l2Txs0[i].FromIdx] = accSender.Nonce
217
218 // if TokenID does not exist yet, create new L1CoordinatorTx to
219 // create the CoordinatorAccount for that TokenID, to receive
220 // the fees. Only in the case that there does not exist yet a
221 // pending L1CoordinatorTx to create the account for the
222 // Coordinator for that TokenID
223 var newL1CoordTx *common.L1Tx
224 newL1CoordTx, positionL1, err =
225 txsel.coordAccountForTokenID(l1CoordinatorTxs,
226 accSender.TokenID, positionL1)
227 if err != nil {
228 return nil, nil, nil, nil, nil, nil, tracerr.Wrap(err)
229 }
230 if newL1CoordTx != nil {
231 // if there is no space for the L1CoordinatorTx, discard the L2Tx
232 if len(l1CoordinatorTxs) >= int(selectionConfig.MaxL1UserTxs)-len(l1UserTxs) {
233 // discard L2Tx, and update Info parameter of
234 // the tx, and add it to the discardedTxs array
235 l2Txs0[i].Info = "Tx not selected because the L2Tx depends on a " +
236 "L1CoordinatorTx and there is not enough space for L1Coordinator"
237 discardedL2Txs = append(discardedL2Txs, l2Txs0[i])
238 continue
239 }
240 // increase positionL1
241 positionL1++
242 l1CoordinatorTxs = append(l1CoordinatorTxs, *newL1CoordTx)
243 accAuths = append(accAuths, txsel.coordAccount.AccountCreationAuth)
244 }
245 l2Txs = append(l2Txs, l2Txs0[i])
246 }
247
248 var validTxs []common.PoolL2Tx
249 // iterate over l2TxsRaw
250 // - check Nonces
251 // - check enough Balance for the Amount+Fee
252 // - if needed, create new L1CoordinatorTxs for unexisting ToIdx
253 // - keep used accAuths
254 // - put the valid txs into validTxs array
255 for i := 0; i < len(l2Txs); i++ {
256 enoughBalance, balance, feeAndAmount := tp.CheckEnoughBalance(l2Txs[i])
257 if !enoughBalance {
258 // not valid Amount with current Balance. Discard L2Tx,
259 // and update Info parameter of the tx, and add it to
260 // the discardedTxs array
261 l2Txs[i].Info = fmt.Sprintf("Tx not selected due to not enough Balance at the sender. "+
262 "Current sender account Balance: %s, Amount+Fee: %s",
263 balance.String(), feeAndAmount.String())
264 discardedL2Txs = append(discardedL2Txs, l2Txs[i])
265 continue
266 }
267 // check if Nonce is correct
268 nonce := noncesMap[l2Txs[i].FromIdx]
269 if l2Txs[i].Nonce == nonce {
270 noncesMap[l2Txs[i].FromIdx]++
271 } else {
272 // not valid Nonce at tx. Discard L2Tx, and update Info
273 // parameter of the tx, and add it to the discardedTxs
274 // array
275 l2Txs[i].Info = fmt.Sprintf("Tx not selected due to not current Nonce. "+
276 "Tx.Nonce: %d, Account.Nonce: %d", l2Txs[i].Nonce, nonce)
277 discardedL2Txs = append(discardedL2Txs, l2Txs[i])
278 continue
279 }
280
281 // If tx.ToIdx>=256, tx.ToIdx should exist to localAccountsDB,
282 // if so, tx is used. If tx.ToIdx==0, for an L2Tx will be the
283 // case of TxToEthAddr or TxToBJJ, check if
284 // tx.ToEthAddr/tx.ToBJJ exist in localAccountsDB, if yes tx is
285 // used; if not, check if tx.ToEthAddr is in
286 // AccountCreationAuthDB, if so, tx is used and L1CoordinatorTx
287 // of CreateAccountAndDeposit is created. If tx.ToIdx==1, is a
288 // Exit type and is used.
289 if l2Txs[i].ToIdx == 0 { // ToEthAddr/ToBJJ case
290 validL2Tx, l1CoordinatorTx, accAuth, err :=
291 txsel.processTxToEthAddrBJJ(validTxs, selectionConfig,
292 len(l1UserTxs), l1CoordinatorTxs, positionL1, l2Txs[i])
293 if err != nil {
294 log.Debugw("txsel.processTxToEthAddrBJJ", "err", err)
295 // Discard L2Tx, and update Info parameter of
296 // the tx, and add it to the discardedTxs array
297 l2Txs[i].Info = fmt.Sprintf("Tx not selected (in processTxToEthAddrBJJ) due to %s",
298 err.Error())
299 discardedL2Txs = append(discardedL2Txs, l2Txs[i])
300 continue
301 }
302 if l1CoordinatorTx != nil {
303 // If ToEthAddr == 0xff.. this means that we
304 // are handling a TransferToBJJ, which doesn't
305 // require an authorization because it doesn't
306 // contain a valid ethereum address.
307 // Otherwise only create the account if we have
308 // the corresponding authorization
309 if validL2Tx.ToEthAddr == common.FFAddr {
310 accAuths = append(accAuths, common.EmptyEthSignature)
311 l1CoordinatorTxs = append(l1CoordinatorTxs, *l1CoordinatorTx)
312 positionL1++
313 } else if accAuth != nil {
314 accAuths = append(accAuths, accAuth.Signature)
315 l1CoordinatorTxs = append(l1CoordinatorTxs, *l1CoordinatorTx)
316 positionL1++
317 }
318 }
319 if validL2Tx != nil {
320 validTxs = append(validTxs, *validL2Tx)
321 }
322 } else if l2Txs[i].ToIdx >= common.IdxUserThreshold {
323 receiverAcc, err := txsel.localAccountsDB.GetAccount(l2Txs[i].ToIdx)
324 if err != nil {
325 // tx not valid
326 log.Debugw("invalid L2Tx: ToIdx not found in StateDB",
327 "ToIdx", l2Txs[i].ToIdx)
328 // Discard L2Tx, and update Info parameter of
329 // the tx, and add it to the discardedTxs array
330 l2Txs[i].Info = fmt.Sprintf("Tx not selected due to tx.ToIdx not found in StateDB. "+
331 "ToIdx: %d", l2Txs[i].ToIdx)
332 discardedL2Txs = append(discardedL2Txs, l2Txs[i])
333 continue
334 }
335 if l2Txs[i].ToEthAddr != common.EmptyAddr {
336 if l2Txs[i].ToEthAddr != receiverAcc.EthAddr {
337 log.Debugw("invalid L2Tx: ToEthAddr does not correspond to the Account.EthAddr",
338 "ToIdx", l2Txs[i].ToIdx, "tx.ToEthAddr",
339 l2Txs[i].ToEthAddr, "account.EthAddr", receiverAcc.EthAddr)
340 // Discard L2Tx, and update Info
341 // parameter of the tx, and add it to
342 // the discardedTxs array
343 l2Txs[i].Info = fmt.Sprintf("Tx not selected because ToEthAddr "+
344 "does not correspond to the Account.EthAddr. "+
345 "tx.ToIdx: %d, tx.ToEthAddr: %s, account.EthAddr: %s",
346 l2Txs[i].ToIdx, l2Txs[i].ToEthAddr, receiverAcc.EthAddr)
347 discardedL2Txs = append(discardedL2Txs, l2Txs[i])
348 continue
349 }
350 }
351 if l2Txs[i].ToBJJ != common.EmptyBJJComp {
352 if l2Txs[i].ToBJJ != receiverAcc.BJJ {
353 log.Debugw("invalid L2Tx: ToBJJ does not correspond to the Account.BJJ",
354 "ToIdx", l2Txs[i].ToIdx, "tx.ToEthAddr", l2Txs[i].ToBJJ,
355 "account.BJJ", receiverAcc.BJJ)
356 // Discard L2Tx, and update Info
357 // parameter of the tx, and add it to
358 // the discardedTxs array
359 l2Txs[i].Info = fmt.Sprintf("Tx not selected because tx.ToBJJ "+
360 "does not correspond to the Account.BJJ. "+
361 "tx.ToIdx: %d, tx.ToEthAddr: %s, tx.ToBJJ: %s, account.BJJ: %s",
362 l2Txs[i].ToIdx, l2Txs[i].ToEthAddr, l2Txs[i].ToBJJ, receiverAcc.BJJ)
363 discardedL2Txs = append(discardedL2Txs, l2Txs[i])
364 continue
365 }
366 }
367
368 // Account found in the DB, include the l2Tx in the selection
369 validTxs = append(validTxs, l2Txs[i])
370 } else if l2Txs[i].ToIdx == common.Idx(1) {
371 // valid txs (of Exit type)
372 validTxs = append(validTxs, l2Txs[i])
373 }
374 }
375
376 // Process L1CoordinatorTxs
377 for i := 0; i < len(l1CoordinatorTxs); i++ {
378 _, _, _, _, err := tp.ProcessL1Tx(nil, &l1CoordinatorTxs[i])
379 if err != nil {
380 return nil, nil, nil, nil, nil, nil, tracerr.Wrap(err)
381 }
382 }
383
384 // get CoordIdxsMap for the TokenIDs
385 coordIdxsMap := make(map[common.TokenID]common.Idx)
386 for i := 0; i < len(validTxs); i++ {
387 // get TokenID from tx.Sender
388 accSender, err := tp.StateDB().GetAccount(validTxs[i].FromIdx)
389 if err != nil {
390 return nil, nil, nil, nil, nil, nil, tracerr.Wrap(err)
391 }
392 tokenID := accSender.TokenID
393
394 coordIdx, err := txsel.getCoordIdx(tokenID)
395 if err != nil {
396 // if err is db.ErrNotFound, should not happen, as all
397 // the validTxs.TokenID should have a CoordinatorIdx
398 // created in the DB at this point
399 return nil, nil, nil, nil, nil, nil, tracerr.Wrap(err)
400 }
401 coordIdxsMap[tokenID] = coordIdx
402 }
403
404 var coordIdxs []common.Idx
405 tp.AccumulatedFees = make(map[common.Idx]*big.Int)
406 for _, idx := range coordIdxsMap {
407 tp.AccumulatedFees[idx] = big.NewInt(0)
408 coordIdxs = append(coordIdxs, idx)
409 }
410 // sort CoordIdxs
411 sort.SliceStable(coordIdxs, func(i, j int) bool {
412 return coordIdxs[i] < coordIdxs[j]
413 })
414
415 // get most profitable L2-tx
416 maxL2Txs := int(selectionConfig.TxProcessorConfig.MaxTx) -
417 len(l1UserTxs) - len(l1CoordinatorTxs)
418
419 selectedL2Txs := validTxs
420 if len(validTxs) > maxL2Txs {
421 selectedL2Txs = selectedL2Txs[:maxL2Txs]
422 }
423 var finalL2Txs []common.PoolL2Tx
424 for i := 0; i < len(selectedL2Txs); i++ {
425 _, _, _, err = tp.ProcessL2Tx(coordIdxsMap, nil, nil, &selectedL2Txs[i])
426 if err != nil {
427 // the error can be due not valid tx data, or due other
428 // cases (such as StateDB error). At this initial
429 // version of the TxSelector, we discard the L2Tx and
430 // log the error, assuming that this will be iterated
431 // in a near future.
432 log.Error(err)
433 // Discard L2Tx, and update Info parameter of the tx,
434 // and add it to the discardedTxs array
435 selectedL2Txs[i].Info = fmt.Sprintf("Tx not selected (in ProcessL2Tx) due to %s", err.Error())
436 discardedL2Txs = append(discardedL2Txs, selectedL2Txs[i])
437 continue
438 }
439 finalL2Txs = append(finalL2Txs, selectedL2Txs[i])
440 }
441
442 // distribute the AccumulatedFees from the processed L2Txs into the
443 // Coordinator Idxs
444 for idx, accumulatedFee := range tp.AccumulatedFees {
445 cmp := accumulatedFee.Cmp(big.NewInt(0))
446 if cmp == 1 { // accumulatedFee>0
447 // send the fee to the Idx of the Coordinator for the TokenID
448 accCoord, err := txsel.localAccountsDB.GetAccount(idx)
449 if err != nil {
450 log.Errorw("Can not distribute accumulated fees to coordinator account: No coord Idx to receive fee", "idx", idx)
451 return nil, nil, nil, nil, nil, nil, tracerr.Wrap(err)
452 }
453 accCoord.Balance = new(big.Int).Add(accCoord.Balance, accumulatedFee)
454 _, err = txsel.localAccountsDB.UpdateAccount(idx, accCoord)
455 if err != nil {
456 log.Error(err)
457 return nil, nil, nil, nil, nil, nil, tracerr.Wrap(err)
458 }
459 }
460 }
461
462 err = tp.StateDB().MakeCheckpoint()
463 if err != nil {
464 return nil, nil, nil, nil, nil, nil, tracerr.Wrap(err)
465 }
466
467 return coordIdxs, accAuths, l1UserTxs, l1CoordinatorTxs, finalL2Txs, discardedL2Txs, nil
468}
469
470// processTxsToEthAddrBJJ process the common.PoolL2Tx in the case where
471// ToIdx==0, which can be the tx type of ToEthAddr or ToBJJ. If the receiver
472// does not have an account yet, a new L1CoordinatorTx of type
473// CreateAccountDeposit (with 0 as DepositAmount) is created and added to the
474// l1CoordinatorTxs array, and then the PoolL2Tx is added into the validTxs
475// array.
476func (txsel *TxSelector) processTxToEthAddrBJJ(validTxs []common.PoolL2Tx,
477 selectionConfig *SelectionConfig, nL1UserTxs int, l1CoordinatorTxs []common.L1Tx,
478 positionL1 int, l2Tx common.PoolL2Tx) (*common.PoolL2Tx, *common.L1Tx,
479 *common.AccountCreationAuth, error) {
480 // if L2Tx needs a new L1CoordinatorTx of CreateAccount type, and a
481 // previous L2Tx in the current process already created a
482 // L1CoordinatorTx of this type, in the DB there still seem that needs
483 // to create a new L1CoordinatorTx, but as is already created, the tx
484 // is valid
485 if checkAlreadyPendingToCreate(l1CoordinatorTxs, l2Tx.TokenID, l2Tx.ToEthAddr, l2Tx.ToBJJ) {
486 return &l2Tx, nil, nil, nil
487 }
488
489 var l1CoordinatorTx *common.L1Tx
490 var accAuth *common.AccountCreationAuth
491 if l2Tx.ToEthAddr != common.EmptyAddr && l2Tx.ToEthAddr != common.FFAddr {
492 // case: ToEthAddr != 0x00 neither 0xff
493 if l2Tx.ToBJJ != common.EmptyBJJComp {
494 // case: ToBJJ!=0:
495 // if idx exist for EthAddr&BJJ use it
496 _, err := txsel.localAccountsDB.GetIdxByEthAddrBJJ(l2Tx.ToEthAddr,
497 l2Tx.ToBJJ, l2Tx.TokenID)
498 if err == nil {
499 // account for ToEthAddr&ToBJJ already exist,
500 // there is no need to create a new one.
501 // tx valid, StateDB will use the ToIdx==0 to define the AuxToIdx
502 return &l2Tx, nil, nil, nil
503 }
504 // if not, check if AccountCreationAuth exist for that
505 // ToEthAddr
506 accAuth, err = txsel.l2db.GetAccountCreationAuth(l2Tx.ToEthAddr)
507 if err != nil {
508 // not found, l2Tx will not be added in the selection
509 return nil, nil, nil, tracerr.Wrap(fmt.Errorf("invalid L2Tx: ToIdx not found in StateDB, neither ToEthAddr found in AccountCreationAuths L2DB. ToIdx: %d, ToEthAddr: %s",
510 l2Tx.ToIdx, l2Tx.ToEthAddr.Hex()))
511 }
512 if accAuth.BJJ != l2Tx.ToBJJ {
513 // if AccountCreationAuth.BJJ is not the same
514 // than in the tx, tx is not accepted
515 return nil, nil, nil, tracerr.Wrap(fmt.Errorf("invalid L2Tx: ToIdx not found in StateDB, neither ToEthAddr & ToBJJ found in AccountCreationAuths L2DB. ToIdx: %d, ToEthAddr: %s, ToBJJ: %s",
516 l2Tx.ToIdx, l2Tx.ToEthAddr.Hex(), l2Tx.ToBJJ.String()))
517 }
518 } else {
519 // case: ToBJJ==0:
520 // if idx exist for EthAddr use it
521 _, err := txsel.localAccountsDB.GetIdxByEthAddr(l2Tx.ToEthAddr, l2Tx.TokenID)
522 if err == nil {
523 // account for ToEthAddr already exist,
524 // there is no need to create a new one.
525 // tx valid, StateDB will use the ToIdx==0 to define the AuxToIdx
526 return &l2Tx, nil, nil, nil
527 }
528 // if not, check if AccountCreationAuth exist for that ToEthAddr
529 accAuth, err = txsel.l2db.GetAccountCreationAuth(l2Tx.ToEthAddr)
530 if err != nil {
531 // not found, l2Tx will not be added in the selection
532 return nil, nil, nil, tracerr.Wrap(fmt.Errorf("invalid L2Tx: ToIdx not found in StateDB, neither ToEthAddr found in AccountCreationAuths L2DB. ToIdx: %d, ToEthAddr: %s",
533 l2Tx.ToIdx, l2Tx.ToEthAddr))
534 }
535 }
536 // create L1CoordinatorTx for the accountCreation
537 l1CoordinatorTx = &common.L1Tx{
538 Position: positionL1,
539 UserOrigin: false,
540 FromEthAddr: accAuth.EthAddr,
541 FromBJJ: accAuth.BJJ,
542 TokenID: l2Tx.TokenID,
543 Amount: big.NewInt(0),
544 DepositAmount: big.NewInt(0),
545 Type: common.TxTypeCreateAccountDeposit,
546 }
547 } else if l2Tx.ToEthAddr == common.FFAddr && l2Tx.ToBJJ != common.EmptyBJJComp {
548 // if idx exist for EthAddr&BJJ use it
549 _, err := txsel.localAccountsDB.GetIdxByEthAddrBJJ(l2Tx.ToEthAddr, l2Tx.ToBJJ,
550 l2Tx.TokenID)
551 if err == nil {
552 // account for ToEthAddr&ToBJJ already exist, (where ToEthAddr==0xff)
553 // there is no need to create a new one.
554 // tx valid, StateDB will use the ToIdx==0 to define the AuxToIdx
555 return &l2Tx, nil, nil, nil
556 }
557 // if idx don't exist for EthAddr&BJJ, coordinator can create a
558 // new account without L1Authorization, as ToEthAddr==0xff
559 // create L1CoordinatorTx for the accountCreation
560 l1CoordinatorTx = &common.L1Tx{
561 Position: positionL1,
562 UserOrigin: false,
563 FromEthAddr: l2Tx.ToEthAddr,
564 FromBJJ: l2Tx.ToBJJ,
565 TokenID: l2Tx.TokenID,
566 Amount: big.NewInt(0),
567 DepositAmount: big.NewInt(0),
568 Type: common.TxTypeCreateAccountDeposit,
569 }
570 }
571 if len(l1CoordinatorTxs) >= int(selectionConfig.MaxL1UserTxs)-nL1UserTxs {
572 // L2Tx discarded
573 return nil, nil, nil, tracerr.Wrap(fmt.Errorf("L2Tx discarded due to no available slots " +
574 "for L1CoordinatorTx to create a new account for receiver of L2Tx"))
575 }
576
577 return &l2Tx, l1CoordinatorTx, accAuth, nil
578}
579
580func checkAlreadyPendingToCreate(l1CoordinatorTxs []common.L1Tx, tokenID common.TokenID,
581 addr ethCommon.Address, bjj babyjub.PublicKeyComp) bool {
582 for i := 0; i < len(l1CoordinatorTxs); i++ {
583 if l1CoordinatorTxs[i].FromEthAddr == addr &&
584 l1CoordinatorTxs[i].TokenID == tokenID &&
585 l1CoordinatorTxs[i].FromBJJ == bjj {
586 return true
587 }
588 }
589 return false
590}
591
592// getL2Profitable returns the profitable selection of L2Txssorted by Nonce
593func (txsel *TxSelector) getL2Profitable(l2Txs []common.PoolL2Tx, max uint32) []common.PoolL2Tx {
594 // Sort by absolute fee
595 sort.Sort(txs(l2Txs))
596
597 if len(l2Txs) > int(max) {
598 l2Txs = l2Txs[:max]
599 }
600
601 // sort l2Txs by Nonce. This can be done in many different ways, what
602 // is needed is to output the l2Txs where the Nonce of l2Txs for each
603 // Account is sorted, but the l2Txs can not be grouped by sender Account
604 // neither by Fee. This is because later on the Nonces will need to be
605 // sequential for the zkproof generation.
606 sort.SliceStable(l2Txs, func(i, j int) bool {
607 return l2Txs[i].Nonce < l2Txs[j].Nonce
608 })
609
610 return l2Txs
611}