INF-22 implements op-signer client

.github/CODEOWNERS

@@ -34,6 +34,7 @@
 /.github      @ethereum-optimism/infra-reviewers
 /ops          @ethereum-optimism/infra-reviewers
 /ops-bedrock  @ethereum-optimism/infra-reviewers
+/op-signer    @ethereum-optimism/infra-reviewers
 
 # Misc
 /proxyd           @ethereum-optimism/infra-reviewers

go.work

@@ -17,6 +17,7 @@ use (
 	./op-node
 	./op-proposer
 	./op-service
+	./op-signer
 	./op-wheel
 	./packages/contracts-bedrock/test-case-generator
 	./proxyd

op-service/tls/cli.go

@@ -3,6 +3,8 @@ package tls
 
 import (
 	"errors"
+	"fmt"
+	"strings"
 
 	"github.com/urfave/cli"
 
@@ -15,22 +17,33 @@ const (
 	TLSKeyFlagName    = "tls.key"
 )
 
+// CLIFlags returns flags with env var envPrefix
+// This should be used for server TLS configs, or when client and server tls configs are the same
 func CLIFlags(envPrefix string) []cli.Flag {
+	return CLIFlagsWithFlagPrefix(envPrefix, "")
+}
+
+// CLIFlagsWithFlagPrefix returns flags with env var and cli flag prefixes
+// Should be used for client TLS configs when different from server on the same process
+func CLIFlagsWithFlagPrefix(envPrefix string, flagPrefix string) []cli.Flag {
+	prefixFunc := func(flagName string) string {
+		return strings.Trim(fmt.Sprintf("%s.%s", flagPrefix, flagName), ".")
+	}
 	return []cli.Flag{
 		cli.StringFlag{
-			Name:   TLSCaCertFlagName,
+			Name:   prefixFunc(TLSCaCertFlagName),
 			Usage:  "tls ca cert path",
 			Value:  "tls/ca.crt",
 			EnvVar: opservice.PrefixEnvVar(envPrefix, "TLS_CA"),
 		},
 		cli.StringFlag{
-			Name:   TLSCertFlagName,
+			Name:   prefixFunc(TLSCertFlagName),
 			Usage:  "tls cert path",
 			Value:  "tls/tls.crt",
 			EnvVar: opservice.PrefixEnvVar(envPrefix, "TLS_CERT"),
 		},
 		cli.StringFlag{
-			Name:   TLSKeyFlagName,
+			Name:   prefixFunc(TLSKeyFlagName),
 			Usage:  "tls key",
 			Value:  "tls/tls.key",
 			EnvVar: opservice.PrefixEnvVar(envPrefix, "TLS_KEY"),
@@ -56,6 +69,8 @@ func (c CLIConfig) TLSEnabled() bool {
 	return !(c.TLSCaCert == "" && c.TLSCert == "" && c.TLSKey == "")
 }
 
+// ReadCLIConfig reads tls cli configs
+// This should be used for server TLS configs, or when client and server tls configs are the same
 func ReadCLIConfig(ctx *cli.Context) CLIConfig {
 	return CLIConfig{
 		TLSCaCert: ctx.GlobalString(TLSCaCertFlagName),
@@ -63,3 +78,16 @@ func ReadCLIConfig(ctx *cli.Context) CLIConfig {
 		TLSKey:    ctx.GlobalString(TLSKeyFlagName),
 	}
 }
+
+// ReadCLIConfigWithPrefix reads tls cli configs with flag prefix
+// Should be used for client TLS configs when different from server on the same process
+func ReadCLIConfigWithPrefix(ctx *cli.Context, flagPrefix string) CLIConfig {
+	prefixFunc := func(flagName string) string {
+		return strings.Trim(fmt.Sprintf("%s.%s", flagPrefix, flagName), ".")
+	}
+	return CLIConfig{
+		TLSCaCert: ctx.GlobalString(prefixFunc(TLSCaCertFlagName)),
+		TLSCert:   ctx.GlobalString(prefixFunc(TLSCertFlagName)),
+		TLSKey:    ctx.GlobalString(prefixFunc(TLSKeyFlagName)),
+	}
+}

op-signer/.gitignore

+mocks/
+mock_*
+tls/

op-signer/README.md

+# op-signer
+
+op-signer service client

op-signer/client/client.go

+package client
+
+import (
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/dyson/certman"
+	optls "github.com/ethereum-optimism/optimism/op-service/tls"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/rpc"
+)
+
+type SignerClient struct {
+	client *rpc.Client
+	status string
+	logger log.Logger
+}
+
+// ethLogger wraps a geth style logger for certman.
+type ethLogger struct{ logger log.Logger }
+
+func (l ethLogger) Printf(format string, v ...interface{}) { l.logger.Info(fmt.Sprintf(format, v...)) }
+
+func NewSignerClient(logger log.Logger, endpoint string, tlsConfig optls.CLIConfig) (*SignerClient, error) {
+	caCert, err := os.ReadFile(tlsConfig.TLSCaCert)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read tls.ca: %w", err)
+	}
+	caCertPool := x509.NewCertPool()
+	caCertPool.AppendCertsFromPEM(caCert)
+
+	// certman watches for newer client certifictes and automatically reloads them
+	cm, err := certman.New(tlsConfig.TLSCert, tlsConfig.TLSKey)
+	cm.Logger(ethLogger{logger: logger})
+	if err != nil {
+		logger.Error("failed to read tls cert or key", "err", err)
+		return nil, err
+	}
+	if err := cm.Watch(); err != nil {
+		logger.Error("failed to start certman watcher", "err", err)
+		return nil, err
+	}
+
+	httpClient := &http.Client{
+		Transport: &http.Transport{
+			TLSClientConfig: &tls.Config{
+				MinVersion: tls.VersionTLS13,
+				RootCAs:    caCertPool,
+				GetClientCertificate: func(_ *tls.CertificateRequestInfo) (*tls.Certificate, error) {
+					return cm.GetCertificate(nil)
+				},
+			},
+		},
+	}
+	rpcClient, err := rpc.DialOptions(context.Background(), endpoint, rpc.WithHTTPClient(httpClient))
+	if err != nil {
+		return nil, err
+	}
+
+	signer := &SignerClient{logger: logger, client: rpcClient}
+	// Check if reachable
+	version, err := signer.pingVersion()
+	if err != nil {
+		return nil, err
+	}
+	signer.status = fmt.Sprintf("ok [version=%v]", version)
+	return signer, nil
+}
+
+func NewSignerClientFromConfig(logger log.Logger, config CLIConfig) (*SignerClient, error) {
+	return NewSignerClient(logger, config.Endpoint, config.TLSConfig)
+}
+
+func (s *SignerClient) pingVersion() (string, error) {
+	var v string
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*3)
+	defer cancel()
+	if err := s.client.CallContext(ctx, &v, "health_status"); err != nil {
+		return "", err
+	}
+	return v, nil
+}
+
+func (s *SignerClient) SignTransaction(ctx context.Context, tx *types.Transaction) (*types.Transaction, error) {
+	args := NewTransactionArgsFromTransaction(tx)
+
+	var result hexutil.Bytes
+	if err := s.client.CallContext(ctx, &result, "eth_signTransaction", args); err != nil {
+		return nil, fmt.Errorf("eth_signTransaction failed: %w", err)
+	}
+
+	signed := &types.Transaction{}
+	if err := signed.UnmarshalBinary(result); err != nil {
+		return nil, err
+	}
+
+	return signed, nil
+}

op-signer/client/config.go

+package client
+
+import (
+	"errors"
+
+	"github.com/urfave/cli"
+
+	opservice "github.com/ethereum-optimism/optimism/op-service"
+	optls "github.com/ethereum-optimism/optimism/op-service/tls"
+)
+
+const (
+	EndpointFlagName = "signer.endpoint"
+	AddressFlagName  = "signer.address"
+)
+
+func CLIFlags(envPrefix string) []cli.Flag {
+	envPrefix += "_SIGNER"
+	flags := []cli.Flag{
+		cli.StringFlag{
+			Name:   EndpointFlagName,
+			Usage:  "Signer endpoint the client will connect to",
+			EnvVar: opservice.PrefixEnvVar(envPrefix, "ENDPOINT"),
+		},
+		cli.StringFlag{
+			Name:   AddressFlagName,
+			Usage:  "Address the signer is signing transactions for",
+			EnvVar: opservice.PrefixEnvVar(envPrefix, "ADDRESS"),
+		},
+	}
+	flags = append(flags, optls.CLIFlagsWithFlagPrefix(envPrefix, "signer")...)
+	return flags
+}
+
+type CLIConfig struct {
+	Endpoint  string
+	Address   string
+	TLSConfig optls.CLIConfig
+}
+
+func (c CLIConfig) Check() error {
+	if err := c.TLSConfig.Check(); err != nil {
+		return err
+	}
+	if !((c.Endpoint == "" && c.Address == "") || (c.Endpoint != "" && c.Address != "")) {
+		return errors.New("signer endpoint and address must both be set or not set")
+	}
+	return nil
+}
+
+func (c CLIConfig) Enabled() bool {
+	if c.Endpoint != "" && c.Address != "" {
+		return true
+	}
+	return false
+}
+
+func ReadCLIConfig(ctx *cli.Context) CLIConfig {
+	cfg := CLIConfig{
+		Endpoint:  ctx.String(EndpointFlagName),
+		Address:   ctx.String(AddressFlagName),
+		TLSConfig: optls.ReadCLIConfigWithPrefix(ctx, "signer"),
+	}
+	return cfg
+}

op-signer/client/transaction_args.go

+package client
+
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core/types"
+)
+
+// TransactionArgs represents the arguments to construct a new transaction
+// or a message call.
+type TransactionArgs struct {
+	From                 *common.Address `json:"from"`
+	To                   *common.Address `json:"to"`
+	Gas                  *hexutil.Uint64 `json:"gas"`
+	GasPrice             *hexutil.Big    `json:"gasPrice"`
+	MaxFeePerGas         *hexutil.Big    `json:"maxFeePerGas"`
+	MaxPriorityFeePerGas *hexutil.Big    `json:"maxPriorityFeePerGas"`
+	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.
+	// Issue detail: https://github.com/ethereum/go-ethereum/issues/15628
+	Data  *hexutil.Bytes `json:"data"`
+	Input *hexutil.Bytes `json:"input"`
+
+	AccessList *types.AccessList `json:"accessList,omitempty"`
+	ChainID    *hexutil.Big      `json:"chainId,omitempty"`
+}
+
+// NewTransactionArgsFromTransaction creates a TransactionArgs struct from an EIP-1559 transaction
+func NewTransactionArgsFromTransaction(tx *types.Transaction) *TransactionArgs {
+	data := hexutil.Bytes(tx.Data())
+	nonce := hexutil.Uint64(tx.Nonce())
+	gas := hexutil.Uint64(tx.Gas())
+	accesses := tx.AccessList()
+	args := &TransactionArgs{
+		Input:                &data,
+		Nonce:                &nonce,
+		Value:                (*hexutil.Big)(tx.Value()),
+		Gas:                  &gas,
+		To:                   tx.To(),
+		ChainID:              (*hexutil.Big)(tx.ChainId()),
+		MaxFeePerGas:         (*hexutil.Big)(tx.GasFeeCap()),
+		MaxPriorityFeePerGas: (*hexutil.Big)(tx.GasTipCap()),
+		AccessList:           &accesses,
+	}
+	return args
+}
+
+// data retrieves the transaction calldata. Input field is preferred.
+func (args *TransactionArgs) data() []byte {
+	if args.Input != nil {
+		return *args.Input
+	}
+	if args.Data != nil {
+		return *args.Data
+	}
+	return nil
+}
+
+// ToTransaction converts the arguments to a transaction.
+func (args *TransactionArgs) ToTransaction() *types.Transaction {
+	var data types.TxData
+	al := types.AccessList{}
+	if args.AccessList != nil {
+		al = *args.AccessList
+	}
+	data = &types.DynamicFeeTx{
+		To:         args.To,
+		ChainID:    (*big.Int)(args.ChainID),
+		Nonce:      uint64(*args.Nonce),
+		Gas:        uint64(*args.Gas),
+		GasFeeCap:  (*big.Int)(args.MaxFeePerGas),
+		GasTipCap:  (*big.Int)(args.MaxPriorityFeePerGas),
+		Value:      (*big.Int)(args.Value),
+		Data:       args.data(),
+		AccessList: al,
+	}
+	return types.NewTx(data)
+}

op-signer/go.mod

+module github.com/ethereum-optimism/optimism/op-signer
+
+go 1.18
+
+require (
+	github.com/dyson/certman v0.3.0
+	github.com/ethereum-optimism/optimism/op-service v0.10.10
+	github.com/ethereum/go-ethereum v1.10.26
+	github.com/urfave/cli v1.22.9
+)
+
+require (
+	github.com/btcsuite/btcd/btcec/v2 v2.2.0 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
+	github.com/deckarep/golang-set v1.8.0 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.1.0 // indirect
+	github.com/fsnotify/fsnotify v1.6.0 // indirect
+	github.com/go-ole/go-ole v1.2.6 // indirect
+	github.com/go-stack/stack v1.8.1 // indirect
+	github.com/gorilla/websocket v1.5.0 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/rivo/uniseg v0.2.1-0.20211004051800-57c86be7915a // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/shirou/gopsutil v3.21.11+incompatible // indirect
+	github.com/tklauser/go-sysconf v0.3.10 // indirect
+	github.com/tklauser/numcpus v0.4.0 // indirect
+	github.com/yusufpapurcu/wmi v1.2.2 // indirect
+	golang.org/x/crypto v0.0.0-20220525230936-793ad666bf5e // indirect
+	golang.org/x/sys v0.0.0-20221013171732-95e765b1cc43 // indirect
+	gopkg.in/natefinch/npipe.v2 v2.0.0-20160621034901-c1b8fa8bdcce // indirect
+)
+
+replace github.com/ethereum/go-ethereum v1.10.26 => github.com/ethereum-optimism/op-geth v0.0.0-20221104231810-30db39cae2be

op-signer/go.sum

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