package til import ( "crypto/ecdsa" "fmt" "math/big" "strconv" "strings" "time" ethCommon "github.com/ethereum/go-ethereum/common" ethCrypto "github.com/ethereum/go-ethereum/crypto" "github.com/hermeznetwork/hermez-node/common" "github.com/hermeznetwork/hermez-node/log" "github.com/iden3/go-iden3-crypto/babyjub" ) // Context contains the data of the test type Context struct { Instructions []instruction accountsNames []string Users map[string]*User lastRegisteredTokenID common.TokenID l1CreatedAccounts map[string]*Account // rollupConstMaxL1UserTx Maximum L1-user transactions allowed to be queued in a batch rollupConstMaxL1UserTx int idx int currBlock common.BlockData currBatch common.BatchData currBatchNum int queues [][]L1Tx toForgeNum int openToForge int currBatchTest struct { l1CoordinatorTxs []L1Tx l2Txs []L2Tx } } // NewContext returns a new Context func NewContext(rollupConstMaxL1UserTx int) *Context { currBatchNum := 1 // The protocol defines the first batchNum to be 1 return &Context{ Users: make(map[string]*User), l1CreatedAccounts: make(map[string]*Account), lastRegisteredTokenID: 0, rollupConstMaxL1UserTx: rollupConstMaxL1UserTx, idx: common.UserThreshold, // We use some placeholder values for StateRoot and ExitTree // because these values will never be nil currBatch: common.BatchData{Batch: common.Batch{ BatchNum: common.BatchNum(currBatchNum), StateRoot: big.NewInt(0), ExitRoot: big.NewInt(0)}}, currBatchNum: currBatchNum, // start with 2 queues, one for toForge, and the other for openToForge queues: make([][]L1Tx, 2), toForgeNum: 0, openToForge: 1, } } // Account contains the data related to the account for a specific TokenID of a User type Account struct { Idx common.Idx Nonce common.Nonce } // User contains the data related to a testing user type User struct { BJJ *babyjub.PrivateKey Addr ethCommon.Address Accounts map[common.TokenID]*Account } // L1Tx is the data structure used internally for transaction test generation, // which contains a common.L1Tx data plus some intermediate data for the // transaction generation. type L1Tx struct { lineNum int fromIdxName string toIdxName string L1Tx common.L1Tx } // L2Tx is the data structure used internally for transaction test generation, // which contains a common.L2Tx data plus some intermediate data for the // transaction generation. type L2Tx struct { lineNum int fromIdxName string toIdxName string tokenID common.TokenID L2Tx common.L2Tx } // GenerateBlocks returns an array of BlockData for a given set. It uses the // accounts (keys & nonces) of the Context. func (tc *Context) GenerateBlocks(set string) ([]common.BlockData, error) { parser := newParser(strings.NewReader(set)) parsedSet, err := parser.parse() if err != nil { return nil, err } tc.Instructions = parsedSet.instructions tc.accountsNames = parsedSet.accounts tc.generateKeys(tc.accountsNames) var blocks []common.BlockData for _, inst := range parsedSet.instructions { switch inst.typ { case txTypeCreateAccountDepositCoordinator: // tx source: L1CoordinatorTx if err := tc.checkIfTokenIsRegistered(inst); err != nil { log.Error(err) return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error()) } tx := common.L1Tx{ FromEthAddr: tc.Users[inst.from].Addr, FromBJJ: tc.Users[inst.from].BJJ.Public(), TokenID: inst.tokenID, Amount: big.NewInt(0), LoadAmount: big.NewInt(int64(inst.loadAmount)), Type: common.TxTypeCreateAccountDeposit, // as txTypeCreateAccountDepositCoordinator is not valid oustide Til package } testTx := L1Tx{ lineNum: inst.lineNum, fromIdxName: inst.from, L1Tx: tx, } tc.currBatchTest.l1CoordinatorTxs = append(tc.currBatchTest.l1CoordinatorTxs, testTx) case common.TxTypeCreateAccountDeposit, common.TxTypeCreateAccountDepositTransfer: // tx source: L1UserTx if err := tc.checkIfTokenIsRegistered(inst); err != nil { log.Error(err) return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error()) } tx := common.L1Tx{ FromEthAddr: tc.Users[inst.from].Addr, FromBJJ: tc.Users[inst.from].BJJ.Public(), TokenID: inst.tokenID, Amount: big.NewInt(0), LoadAmount: big.NewInt(int64(inst.loadAmount)), Type: inst.typ, } if inst.typ == common.TxTypeCreateAccountDepositTransfer { tx.Amount = big.NewInt(int64(inst.amount)) } testTx := L1Tx{ lineNum: inst.lineNum, fromIdxName: inst.from, toIdxName: inst.to, L1Tx: tx, } if err := tc.addToL1Queue(testTx); err != nil { return nil, err } case common.TxTypeDeposit, common.TxTypeDepositTransfer: // tx source: L1UserTx if err := tc.checkIfTokenIsRegistered(inst); err != nil { log.Error(err) return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error()) } if err := tc.checkIfAccountExists(inst.from, inst); err != nil { log.Error(err) return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error()) } tx := common.L1Tx{ TokenID: inst.tokenID, Amount: big.NewInt(0), LoadAmount: big.NewInt(int64(inst.loadAmount)), Type: inst.typ, } if inst.typ == common.TxTypeDepositTransfer { tx.Amount = big.NewInt(int64(inst.amount)) } testTx := L1Tx{ lineNum: inst.lineNum, fromIdxName: inst.from, toIdxName: inst.to, L1Tx: tx, } if err := tc.addToL1Queue(testTx); err != nil { return nil, err } case common.TxTypeTransfer: // L2Tx if err := tc.checkIfTokenIsRegistered(inst); err != nil { log.Error(err) return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error()) } tx := common.L2Tx{ Amount: big.NewInt(int64(inst.amount)), Fee: common.FeeSelector(inst.fee), Type: common.TxTypeTransfer, } tx.BatchNum = common.BatchNum(tc.currBatchNum) // when converted to PoolL2Tx BatchNum parameter is lost testTx := L2Tx{ lineNum: inst.lineNum, fromIdxName: inst.from, toIdxName: inst.to, tokenID: inst.tokenID, L2Tx: tx, } tc.currBatchTest.l2Txs = append(tc.currBatchTest.l2Txs, testTx) case common.TxTypeExit: // tx source: L2Tx if err := tc.checkIfTokenIsRegistered(inst); err != nil { log.Error(err) return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error()) } tx := common.L2Tx{ ToIdx: common.Idx(1), // as is an Exit Amount: big.NewInt(int64(inst.amount)), Type: common.TxTypeExit, } tx.BatchNum = common.BatchNum(tc.currBatchNum) // when converted to PoolL2Tx BatchNum parameter is lost testTx := L2Tx{ lineNum: inst.lineNum, fromIdxName: inst.from, toIdxName: inst.to, tokenID: inst.tokenID, L2Tx: tx, } tc.currBatchTest.l2Txs = append(tc.currBatchTest.l2Txs, testTx) case common.TxTypeForceExit: // tx source: L1UserTx if err := tc.checkIfTokenIsRegistered(inst); err != nil { log.Error(err) return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error()) } tx := common.L1Tx{ ToIdx: common.Idx(1), // as is an Exit TokenID: inst.tokenID, Amount: big.NewInt(int64(inst.amount)), LoadAmount: big.NewInt(0), Type: common.TxTypeExit, } testTx := L1Tx{ lineNum: inst.lineNum, fromIdxName: inst.from, toIdxName: inst.to, L1Tx: tx, } if err := tc.addToL1Queue(testTx); err != nil { return nil, err } case typeNewBatch: if err = tc.calculateIdxForL1Txs(true, tc.currBatchTest.l1CoordinatorTxs); err != nil { return nil, err } if err = tc.setIdxs(); err != nil { log.Error(err) return nil, err } case typeNewBatchL1: // for each L1UserTx of the queues[ToForgeNum], calculate the Idx if err = tc.calculateIdxForL1Txs(false, tc.queues[tc.toForgeNum]); err != nil { return nil, err } if err = tc.calculateIdxForL1Txs(true, tc.currBatchTest.l1CoordinatorTxs); err != nil { return nil, err } if err = tc.setIdxs(); err != nil { log.Error(err) return nil, err } // advance batch tc.toForgeNum++ if tc.toForgeNum == tc.openToForge { tc.openToForge++ newQueue := []L1Tx{} tc.queues = append(tc.queues, newQueue) } case typeNewBlock: blocks = append(blocks, tc.currBlock) tc.currBlock = common.BlockData{} case typeAddToken: newToken := common.Token{ TokenID: inst.tokenID, EthBlockNum: int64(len(blocks)), } if inst.tokenID != tc.lastRegisteredTokenID+1 { return nil, fmt.Errorf("Line %d: AddToken TokenID should be sequential, expected TokenID: %d, defined TokenID: %d", inst.lineNum, tc.lastRegisteredTokenID+1, inst.tokenID) } tc.lastRegisteredTokenID++ tc.currBlock.AddedTokens = append(tc.currBlock.AddedTokens, newToken) default: return nil, fmt.Errorf("Line %d: Unexpected type: %s", inst.lineNum, inst.typ) } } return blocks, nil } // calculateIdxsForL1Txs calculates new Idx for new created accounts. If // 'isCoordinatorTxs==true', adds the tx to tc.currBatch.L1CoordinatorTxs. func (tc *Context) calculateIdxForL1Txs(isCoordinatorTxs bool, txs []L1Tx) error { // for each batch.L1CoordinatorTxs of the queues[ToForgeNum], calculate the Idx for i := 0; i < len(txs); i++ { tx := txs[i] if tx.L1Tx.Type == common.TxTypeCreateAccountDeposit || tx.L1Tx.Type == common.TxTypeCreateAccountDepositTransfer { if tc.Users[tx.fromIdxName].Accounts[tx.L1Tx.TokenID] != nil { // if account already exists, return error return fmt.Errorf("Can not create same account twice (same User & same TokenID) (this is a design property of Til)") } tc.Users[tx.fromIdxName].Accounts[tx.L1Tx.TokenID] = &Account{ Idx: common.Idx(tc.idx), Nonce: common.Nonce(0), } tc.l1CreatedAccounts[idxTokenIDToString(tx.fromIdxName, tx.L1Tx.TokenID)] = tc.Users[tx.fromIdxName].Accounts[tx.L1Tx.TokenID] tc.idx++ } if isCoordinatorTxs { tc.currBatch.L1CoordinatorTxs = append(tc.currBatch.L1CoordinatorTxs, tx.L1Tx) } } return nil } // setIdxs sets the Idxs to the transactions of the tc.currBatch func (tc *Context) setIdxs() error { // once Idxs are calculated, update transactions to use the new Idxs for i := 0; i < len(tc.currBatchTest.l2Txs); i++ { testTx := &tc.currBatchTest.l2Txs[i] if tc.Users[testTx.fromIdxName].Accounts[testTx.tokenID] == nil { return fmt.Errorf("Line %d: %s from User %s for TokenID %d while account not created yet", testTx.lineNum, testTx.L2Tx.Type, testTx.fromIdxName, testTx.tokenID) } if testTx.L2Tx.Type == common.TxTypeTransfer { if _, ok := tc.l1CreatedAccounts[idxTokenIDToString(testTx.toIdxName, testTx.tokenID)]; !ok { return fmt.Errorf("Line %d: Can not create Transfer for a non existing account. Batch %d, ToIdx name: %s, TokenID: %d", testTx.lineNum, tc.currBatchNum, testTx.toIdxName, testTx.tokenID) } } tc.Users[testTx.fromIdxName].Accounts[testTx.tokenID].Nonce++ testTx.L2Tx.Nonce = tc.Users[testTx.fromIdxName].Accounts[testTx.tokenID].Nonce // set real Idx testTx.L2Tx.FromIdx = tc.Users[testTx.fromIdxName].Accounts[testTx.tokenID].Idx if testTx.L2Tx.Type == common.TxTypeTransfer { testTx.L2Tx.ToIdx = tc.Users[testTx.toIdxName].Accounts[testTx.tokenID].Idx } // in case Type==Exit, ToIdx=1, already set at the // GenerateBlocks main switch inside TxTypeExit case nTx, err := common.NewL2Tx(&testTx.L2Tx) if err != nil { return fmt.Errorf("Line %d: %s", testTx.lineNum, err.Error()) } testTx.L2Tx = *nTx tc.currBatch.L2Txs = append(tc.currBatch.L2Txs, testTx.L2Tx) } tc.currBlock.Batches = append(tc.currBlock.Batches, tc.currBatch) tc.currBatchNum++ tc.currBatch = common.BatchData{Batch: tc.currBatch.Batch} tc.currBatch.Batch.BatchNum = common.BatchNum(tc.currBatchNum) tc.currBatchTest.l1CoordinatorTxs = nil tc.currBatchTest.l2Txs = nil return nil } // addToL1Queue adds the L1Tx into the queue that is open and has space func (tc *Context) addToL1Queue(tx L1Tx) error { if len(tc.queues[tc.openToForge]) >= tc.rollupConstMaxL1UserTx { // if current OpenToForge queue reached its Max, move into a // new queue tc.openToForge++ newQueue := []L1Tx{} tc.queues = append(tc.queues, newQueue) } // Fill L1UserTx specific parameters tx.L1Tx.UserOrigin = true toForgeL1TxsNum := int64(tc.openToForge) tx.L1Tx.ToForgeL1TxsNum = &toForgeL1TxsNum // When an L1UserTx is generated, all idxs must be available (except when idx == 0 or idx == 1) if tx.L1Tx.Type != common.TxTypeCreateAccountDeposit && tx.L1Tx.Type != common.TxTypeCreateAccountDepositTransfer { tx.L1Tx.FromIdx = tc.Users[tx.fromIdxName].Accounts[tx.L1Tx.TokenID].Idx } tx.L1Tx.FromEthAddr = tc.Users[tx.fromIdxName].Addr tx.L1Tx.FromBJJ = tc.Users[tx.fromIdxName].BJJ.Public() if tx.toIdxName == "" { tx.L1Tx.ToIdx = common.Idx(0) } else { account, ok := tc.Users[tx.toIdxName].Accounts[tx.L1Tx.TokenID] if !ok { return fmt.Errorf("Line %d: Transfer to User: %s, for TokenID: %d, "+ "while account not created yet", tx.lineNum, tx.toIdxName, tx.L1Tx.TokenID) } tx.L1Tx.ToIdx = account.Idx } if tx.L1Tx.Type == common.TxTypeExit { tx.L1Tx.ToIdx = common.Idx(1) } nTx, err := common.NewL1Tx(&tx.L1Tx) if err != nil { return fmt.Errorf("Line %d: %s", tx.lineNum, err.Error()) } tx.L1Tx = *nTx tc.queues[tc.openToForge] = append(tc.queues[tc.openToForge], tx) tc.currBlock.L1UserTxs = append(tc.currBlock.L1UserTxs, tx.L1Tx) return nil } func (tc *Context) checkIfAccountExists(tf string, inst instruction) error { if tc.Users[tf].Accounts[inst.tokenID] == nil { return fmt.Errorf("%s at User: %s, for TokenID: %d, while account not created yet", inst.typ, tf, inst.tokenID) } return nil } func (tc *Context) checkIfTokenIsRegistered(inst instruction) error { if inst.tokenID > tc.lastRegisteredTokenID { return fmt.Errorf("Can not process %s: TokenID %d not registered, last registered TokenID: %d", inst.typ, inst.tokenID, tc.lastRegisteredTokenID) } return nil } // GeneratePoolL2Txs returns an array of common.PoolL2Tx from a given set. It // uses the accounts (keys & nonces) of the Context. func (tc *Context) GeneratePoolL2Txs(set string) ([]common.PoolL2Tx, error) { parser := newParser(strings.NewReader(set)) parsedSet, err := parser.parse() if err != nil { return nil, err } tc.Instructions = parsedSet.instructions tc.accountsNames = parsedSet.accounts tc.generateKeys(tc.accountsNames) txs := []common.PoolL2Tx{} for _, inst := range tc.Instructions { switch inst.typ { case common.TxTypeTransfer: if err := tc.checkIfAccountExists(inst.from, inst); err != nil { log.Error(err) return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error()) } if err := tc.checkIfAccountExists(inst.to, inst); err != nil { log.Error(err) return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error()) } tc.Users[inst.from].Accounts[inst.tokenID].Nonce++ // if account of receiver does not exist, don't use // ToIdx, and use only ToEthAddr & ToBJJ tx := common.PoolL2Tx{ FromIdx: tc.Users[inst.from].Accounts[inst.tokenID].Idx, ToIdx: tc.Users[inst.to].Accounts[inst.tokenID].Idx, ToEthAddr: tc.Users[inst.to].Addr, ToBJJ: tc.Users[inst.to].BJJ.Public(), TokenID: inst.tokenID, Amount: big.NewInt(int64(inst.amount)), Fee: common.FeeSelector(inst.fee), Nonce: tc.Users[inst.from].Accounts[inst.tokenID].Nonce, State: common.PoolL2TxStatePending, Timestamp: time.Now(), RqToEthAddr: common.EmptyAddr, RqToBJJ: nil, Type: common.TxTypeTransfer, } nTx, err := common.NewPoolL2Tx(&tx) if err != nil { return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error()) } tx = *nTx // perform signature and set it to tx.Signature toSign, err := tx.HashToSign() if err != nil { return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error()) } sig := tc.Users[inst.from].BJJ.SignPoseidon(toSign) tx.Signature = sig.Compress() txs = append(txs, tx) case common.TxTypeExit: tc.Users[inst.from].Accounts[inst.tokenID].Nonce++ tx := common.PoolL2Tx{ FromIdx: tc.Users[inst.from].Accounts[inst.tokenID].Idx, ToIdx: common.Idx(1), // as is an Exit TokenID: inst.tokenID, Amount: big.NewInt(int64(inst.amount)), Nonce: tc.Users[inst.from].Accounts[inst.tokenID].Nonce, Type: common.TxTypeExit, } nTx, err := common.NewPoolL2Tx(&tx) if err != nil { return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error()) } tx = *nTx // perform signature and set it to tx.Signature toSign, err := tx.HashToSign() if err != nil { return nil, fmt.Errorf("Line %d: %s", inst.lineNum, err.Error()) } sig := tc.Users[inst.from].BJJ.SignPoseidon(toSign) tx.Signature = sig.Compress() txs = append(txs, tx) default: return nil, fmt.Errorf("Line %d: instruction type unrecognized: %s", inst.lineNum, inst.typ) } } return txs, nil } // generateKeys generates BabyJubJub & Address keys for the given list of // account names in a deterministic way. This means, that for the same given // 'accNames' in a certain order, the keys will be always the same. func (tc *Context) generateKeys(accNames []string) { for i := 1; i < len(accNames)+1; i++ { if _, ok := tc.Users[accNames[i-1]]; ok { // account already created continue } // babyjubjub key var sk babyjub.PrivateKey copy(sk[:], []byte(strconv.Itoa(i))) // only for testing // eth address var key ecdsa.PrivateKey key.D = big.NewInt(int64(i)) // only for testing key.PublicKey.X, key.PublicKey.Y = ethCrypto.S256().ScalarBaseMult(key.D.Bytes()) key.Curve = ethCrypto.S256() addr := ethCrypto.PubkeyToAddress(key.PublicKey) u := User{ BJJ: &sk, Addr: addr, Accounts: make(map[common.TokenID]*Account), } tc.Users[accNames[i-1]] = &u } }