Implement eth_sendTransaction (#104)

* Set up framework for sending transaction with correct args and nonce mutex locking

* Set up printing ethereum address through emintkeys and getting chainid from flags

* Implemented defaults for eth_sendTransaction

* Fix bug with no data provided

* Updated comments and error, as well as RLP encoded tx bytes for return instead of amino encoded

keys/show.go

@@ -19,6 +19,8 @@ import (
 const (
 	// FlagAddress is the flag for the user's address on the command line.
 	FlagAddress = "address"
+	// FlagAddress is the flag for the user's address on the command line.
+	FlagETHAddress = "ethwallet"
 	// FlagPublicKey represents the user's public key on the command line.
 	FlagPublicKey = "pubkey"
 	// FlagBechPrefix defines a desired Bech32 prefix encoding for a key.
@@ -38,6 +40,7 @@ func showKeysCmd() *cobra.Command {
 
 	cmd.Flags().String(FlagBechPrefix, sdk.PrefixAccount, "The Bech32 prefix encoding for a key (acc|val|cons)")
 	cmd.Flags().BoolP(FlagAddress, "a", false, "Output the address only (overrides --output)")
+	cmd.Flags().BoolP(FlagETHAddress, "w", false, "Output the Ethereum address only (overrides --output)")
 	cmd.Flags().BoolP(FlagPublicKey, "p", false, "Output the public key only (overrides --output)")
 	cmd.Flags().BoolP(FlagDevice, "d", false, "Output the address in a ledger device")
 	cmd.Flags().Bool(flags.FlagIndentResponse, false, "Add indent to JSON response")
@@ -58,6 +61,7 @@ func runShowCmd(cmd *cobra.Command, args []string) (err error) {
 	}
 
 	isShowAddr := viper.GetBool(FlagAddress)
+	isShowEthAddr := viper.GetBool(FlagETHAddress)
 	isShowPubKey := viper.GetBool(FlagPublicKey)
 	isShowDevice := viper.GetBool(FlagDevice)
 
@@ -67,11 +71,13 @@ func runShowCmd(cmd *cobra.Command, args []string) (err error) {
 		isOutputSet = tmp.Changed
 	}
 
-	if isShowAddr && isShowPubKey {
+	isShowEitherAddr := isShowAddr || isShowEthAddr
-		return errors.New("cannot use both --address and --pubkey at once")
+
+	if isShowEitherAddr && isShowPubKey {
+		return errors.New("cannot get address, with --address or --ethwallet, and --pubkey at once")
 	}
 
-	if isOutputSet && (isShowAddr || isShowPubKey) {
+	if isOutputSet && (isShowEitherAddr || isShowPubKey) {
 		return errors.New("cannot use --output with --address or --pubkey")
 	}
 
@@ -80,6 +86,8 @@ func runShowCmd(cmd *cobra.Command, args []string) (err error) {
 	switch {
 	case isShowAddr:
 		printKeyAddress(info, keyOutputFunction)
+	case isShowEthAddr:
+		printKeyEthAddress(info, keyOutputFunction)
 	case isShowPubKey:
 		printPubKey(info, keyOutputFunction)
 	default:

keys/utils.go

@@ -148,6 +148,15 @@ func printKeyAddress(info cosmosKeys.Info, bechKeyOut bechKeyOutFn) {
 	fmt.Println(ko.Address)
 }
 
+func printKeyEthAddress(info cosmosKeys.Info, bechKeyOut bechKeyOutFn) {
+	ko, err := bechKeyOut(info)
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(ko.ETHAddress)
+}
+
 func printPubKey(info cosmosKeys.Info, bechKeyOut bechKeyOutFn) {
 	ko, err := bechKeyOut(info)
 	if err != nil {

rpc/addrlock.go

@@ -0,0 +1,38 @@
+package rpc
+
+import (
+	"sync"
+
+	"github.com/ethereum/go-ethereum/common"
+)
+
+// AddrLocker is a mutex structure used to avoid querying outdated account data
+type AddrLocker struct {
+	mu    sync.Mutex
+	locks map[common.Address]*sync.Mutex
+}
+
+// lock returns the lock of the given address.
+func (l *AddrLocker) lock(address common.Address) *sync.Mutex {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	if l.locks == nil {
+		l.locks = make(map[common.Address]*sync.Mutex)
+	}
+	if _, ok := l.locks[address]; !ok {
+		l.locks[address] = new(sync.Mutex)
+	}
+	return l.locks[address]
+}
+
+// LockAddr locks an account's mutex. This is used to prevent another tx getting the
+// same nonce until the lock is released. The mutex prevents the (an identical nonce) from
+// being read again during the time that the first transaction is being signed.
+func (l *AddrLocker) LockAddr(address common.Address) {
+	l.lock(address).Lock()
+}
+
+// UnlockAddr unlocks the mutex of the given account.
+func (l *AddrLocker) UnlockAddr(address common.Address) {
+	l.lock(address).Unlock()
+}

rpc/apis.go

@@ -10,6 +10,7 @@ import (
 
 // GetRPCAPIs returns the list of all APIs
 func GetRPCAPIs(cliCtx context.CLIContext, key emintcrypto.PrivKeySecp256k1) []rpc.API {
+	nonceLock := new(AddrLocker)
 	return []rpc.API{
 		{
 			Namespace: "web3",
@@ -20,13 +21,13 @@ func GetRPCAPIs(cliCtx context.CLIContext, key emintcrypto.PrivKeySecp256k1) []r
 		{
 			Namespace: "eth",
 			Version:   "1.0",
-			Service:   NewPublicEthAPI(cliCtx, key),
+			Service:   NewPublicEthAPI(cliCtx, nonceLock, key),
 			Public:    true,
 		},
 		{
 			Namespace: "personal",
 			Version:   "1.0",
-			Service:   NewPersonalEthAPI(cliCtx),
+			Service:   NewPersonalEthAPI(cliCtx, nonceLock),
 			Public:    false,
 		},
 	}

rpc/args/send_tx.go

@@ -0,0 +1,22 @@
+package args
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+)
+
+// SendTxArgs represents the arguments to sumbit a new transaction into the transaction pool.
+// Duplicate struct definition since geth struct is in internal package
+// Ref: https://github.com/ethereum/go-ethereum/blob/release/1.9/internal/ethapi/api.go#L1346
+type SendTxArgs struct {
+	From     common.Address  `json:"from"`
+	To       *common.Address `json:"to"`
+	Gas      *hexutil.Uint64 `json:"gas"`
+	GasPrice *hexutil.Big    `json:"gasPrice"`
+	Value    *hexutil.Big    `json:"value"`
+	Nonce    *hexutil.Uint64 `json:"nonce"`
+	// We accept "data" and "input" for backwards-compatibility reasons. "input" is the
+	// newer name and should be preferred by clients.
+	Data  *hexutil.Bytes `json:"data"`
+	Input *hexutil.Bytes `json:"input"`
+}

rpc/eth_api.go

@@ -9,6 +9,7 @@ import (
 	authutils "github.com/cosmos/cosmos-sdk/x/auth/client/utils"
 	emintcrypto "github.com/cosmos/ethermint/crypto"
 	emintkeys "github.com/cosmos/ethermint/keys"
+	"github.com/cosmos/ethermint/rpc/args"
 	"github.com/cosmos/ethermint/version"
 	"github.com/cosmos/ethermint/x/evm/types"
 
@@ -17,20 +18,26 @@ import (
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/rpc"
-	"github.com/ethereum/go-ethereum/signer/core"
+
+	"github.com/cosmos/cosmos-sdk/client/flags"
+	"github.com/spf13/viper"
 )
 
 // PublicEthAPI is the eth_ prefixed set of APIs in the Web3 JSON-RPC spec.
 type PublicEthAPI struct {
 	cliCtx    context.CLIContext
 	key       emintcrypto.PrivKeySecp256k1
+	nonceLock *AddrLocker
 }
 
 // NewPublicEthAPI creates an instance of the public ETH Web3 API.
-func NewPublicEthAPI(cliCtx context.CLIContext, key emintcrypto.PrivKeySecp256k1) *PublicEthAPI {
+func NewPublicEthAPI(cliCtx context.CLIContext, nonceLock *AddrLocker,
+	key emintcrypto.PrivKeySecp256k1) *PublicEthAPI {
+
 	return &PublicEthAPI{
 		cliCtx:    cliCtx,
 		key:       key,
+		nonceLock: nonceLock,
 	}
 }
 
@@ -200,9 +207,54 @@ func (e *PublicEthAPI) Sign(address common.Address, data hexutil.Bytes) (hexutil
 }
 
 // SendTransaction sends an Ethereum transaction.
-func (e *PublicEthAPI) SendTransaction(args core.SendTxArgs) common.Hash {
+func (e *PublicEthAPI) SendTransaction(args args.SendTxArgs) (common.Hash, error) {
-	var h common.Hash
+	// TODO: Change this functionality to find an unlocked account by address
-	return h
+	if e.key == nil || !bytes.Equal(e.key.PubKey().Address().Bytes(), args.From.Bytes()) {
+		return common.Hash{}, keystore.ErrLocked
+	}
+
+	// Mutex lock the address' nonce to avoid assigning it to multiple requests
+	if args.Nonce == nil {
+		e.nonceLock.LockAddr(args.From)
+		defer e.nonceLock.UnlockAddr(args.From)
+	}
+
+	// Assemble transaction from fields
+	tx, err := types.GenerateFromArgs(args, e.cliCtx)
+	if err != nil {
+		return common.Hash{}, err
+	}
+
+	// ChainID must be set as flag to send transaction
+	chainID := viper.GetString(flags.FlagChainID)
+	// parse the chainID from a string to a base-10 integer
+	intChainID, ok := new(big.Int).SetString(chainID, 10)
+	if !ok {
+		return common.Hash{}, fmt.Errorf(
+			fmt.Sprintf("Invalid chainID: %s, must be integer format", chainID))
+	}
+
+	// Sign transaction
+	tx.Sign(intChainID, e.key.ToECDSA())
+
+	// Encode transaction by default Tx encoder
+	txEncoder := authutils.GetTxEncoder(e.cliCtx.Codec)
+	txBytes, err := txEncoder(tx)
+	if err != nil {
+		return common.Hash{}, err
+	}
+
+	// Broadcast transaction
+	res, err := e.cliCtx.BroadcastTx(txBytes)
+	// If error is encountered on the node, the broadcast will not return an error
+	// TODO: Remove res log
+	fmt.Println(res.RawLog)
+	if err != nil {
+		return common.Hash{}, err
+	}
+
+	// Return RLP encoded bytes
+	return tx.Hash(), nil
 }
 
 // SendRawTransaction send a raw Ethereum transaction.
@@ -225,12 +277,14 @@ func (e *PublicEthAPI) SendRawTransaction(data hexutil.Bytes) (common.Hash, erro
 	// TODO: Possibly log the contract creation address (if recipient address is nil) or tx data
 	res, err := e.cliCtx.BroadcastTx(txBytes)
 	// If error is encountered on the node, the broadcast will not return an error
+	// TODO: Remove res log
 	fmt.Println(res.RawLog)
 	if err != nil {
 		return common.Hash{}, err
 	}
 
-	return common.HexToHash(res.TxHash), nil
+	// Return RLP encoded bytes
+	return tx.Hash(), nil
 }
 
 // CallArgs represents arguments to a smart contract call as provided by RPC clients.

rpc/personal_api.go

@@ -11,12 +11,14 @@ import (
 // PersonalEthAPI is the eth_ prefixed set of APIs in the Web3 JSON-RPC spec.
 type PersonalEthAPI struct {
 	cliCtx    sdkcontext.CLIContext
+	nonceLock *AddrLocker
 }
 
 // NewPersonalEthAPI creates an instance of the public ETH Web3 API.
-func NewPersonalEthAPI(cliCtx sdkcontext.CLIContext) *PersonalEthAPI {
+func NewPersonalEthAPI(cliCtx sdkcontext.CLIContext, nonceLock *AddrLocker) *PersonalEthAPI {
 	return &PersonalEthAPI{
 		cliCtx:    cliCtx,
+		nonceLock: nonceLock,
 	}
 }
 

x/evm/types/msg.go

@@ -1,6 +1,7 @@
 package types
 
 import (
+	"bytes"
 	"crypto/ecdsa"
 	"errors"
 	"fmt"
@@ -10,8 +11,11 @@ import (
 
 	"github.com/cosmos/cosmos-sdk/codec"
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
+	"github.com/cosmos/ethermint/rpc/args"
 	"github.com/cosmos/ethermint/types"
 
+	"github.com/cosmos/cosmos-sdk/client/context"
 	ethcmn "github.com/ethereum/go-ethereum/common"
 	ethtypes "github.com/ethereum/go-ethereum/core/types"
 	ethcrypto "github.com/ethereum/go-ethereum/crypto"
@@ -355,3 +359,60 @@ func recoverEthSig(R, S, Vb *big.Int, sigHash ethcmn.Hash) (ethcmn.Address, erro
 
 	return addr, nil
 }
+
+// PopulateFromArgs populates tx message with args (used in RPC API)
+func GenerateFromArgs(args args.SendTxArgs, ctx context.CLIContext) (msg *EthereumTxMsg, err error) {
+	var nonce uint64
+
+	var gasLimit uint64
+
+	amount := (*big.Int)(args.Value)
+
+	gasPrice := (*big.Int)(args.GasPrice)
+
+	if args.GasPrice == nil {
+		// Set default gas price
+		// TODO: Change to min gas price from context once available through server/daemon
+		gasPrice = big.NewInt(20)
+	}
+
+	if args.Nonce == nil {
+		// Get nonce (sequence) from account
+		from := sdk.AccAddress(args.From.Bytes())
+		_, nonce, err = authtypes.NewAccountRetriever(ctx).GetAccountNumberSequence(from)
+		if err != nil {
+			return nil, err
+		}
+	} else {
+		nonce = (uint64)(*args.Nonce)
+	}
+
+	if args.Data != nil && args.Input != nil && !bytes.Equal(*args.Data, *args.Input) {
+		return nil, fmt.Errorf(`both "data" and "input" are set and not equal. Please use "input" to pass transaction call data`)
+	}
+
+	// Sets input to either Input or Data, if both are set and not equal error above returns
+	var input []byte
+	if args.Input != nil {
+		input = *args.Input
+	} else if args.Data != nil {
+		input = *args.Data
+	}
+
+	if args.To == nil {
+		// Contract creation
+		if len(input) == 0 {
+			return nil, fmt.Errorf("contract creation without any data provided")
+		}
+	}
+
+	if args.Gas == nil {
+		// Estimate the gas usage if necessary.
+		// TODO: Set gas based on estimate when simulating txs are setup
+		gasLimit = 22000
+	} else {
+		gasLimit = (uint64)(*args.Gas)
+	}
+
+	return newEthereumTxMsg(nonce, args.To, amount, gasLimit, gasPrice, input), nil
+}