laconicd/rpc/config.go

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package rpc
import (
"bufio"
"fmt"
"os"
"github.com/cosmos/cosmos-sdk/client"
"github.com/cosmos/cosmos-sdk/client/flags"
"github.com/cosmos/cosmos-sdk/client/input"
emintkeys "github.com/cosmos/cosmos-sdk/client/keys"
"github.com/cosmos/cosmos-sdk/client/lcd"
"github.com/cosmos/cosmos-sdk/codec"
authrest "github.com/cosmos/cosmos-sdk/x/auth/client/rest"
"github.com/cosmos/ethermint/app"
emintcrypto "github.com/cosmos/ethermint/crypto"
"github.com/ethereum/go-ethereum/rpc"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
const (
flagUnlockKey = "unlock-key"
)
// Config contains configuration fields that determine the behavior of the RPC HTTP server.
// TODO: These may become irrelevant if HTTP config is handled by the SDK
type Config struct {
// EnableRPC defines whether or not to enable the RPC server
EnableRPC bool
// RPCAddr defines the IP address to listen on
RPCAddr string
// RPCPort defines the port to listen on
RPCPort int
// RPCCORSDomains defines list of domains to enable CORS headers for (used by browsers)
RPCCORSDomains []string
// RPCVhosts defines list of domains to listen on (useful if Tendermint is addressable via DNS)
RPCVHosts []string
}
// EmintServeCmd creates a CLI command to start Cosmos LCD server with web3 RPC API and
// Cosmos rest-server endpoints
func EmintServeCmd(cdc *codec.Codec) *cobra.Command {
cmd := lcd.ServeCommand(cdc, registerRoutes)
cmd.Flags().String(flagUnlockKey, "", "Select a key to unlock on the RPC server")
cmd.Flags().StringP(flags.FlagBroadcastMode, "b", flags.BroadcastSync, "Transaction broadcasting mode (sync|async|block)")
return cmd
}
// registerRoutes creates a new server and registers the `/rpc` endpoint.
// Rpc calls are enabled based on their associated module (eg. "eth").
func registerRoutes(rs *lcd.RestServer) {
s := rpc.NewServer()
accountName := viper.GetString(flagUnlockKey)
var emintKey emintcrypto.PrivKeySecp256k1
if len(accountName) > 0 {
var err error
buf := bufio.NewReader(os.Stdin)
keyringBackend := viper.GetString(flags.FlagKeyringBackend)
passphrase := ""
switch keyringBackend {
case flags.KeyringBackendOS:
break
case flags.KeyringBackendFile:
passphrase, err = input.GetPassword("Enter password to unlock key for RPC API: ", buf)
if err != nil {
panic(err)
}
}
emintKey, err = unlockKeyFromNameAndPassphrase(accountName, passphrase)
if err != nil {
panic(err)
}
}
apis := GetRPCAPIs(rs.CliCtx, emintKey)
// TODO: Allow cli to configure modules https://github.com/ChainSafe/ethermint/issues/74
whitelist := make(map[string]bool)
// Register all the APIs exposed by the services
for _, api := range apis {
if whitelist[api.Namespace] || (len(whitelist) == 0 && api.Public) {
if err := s.RegisterName(api.Namespace, api.Service); err != nil {
panic(err)
}
}
}
// Web3 RPC API route
rs.Mux.HandleFunc("/", s.ServeHTTP).Methods("POST", "OPTIONS")
// Register all other Cosmos routes
client.RegisterRoutes(rs.CliCtx, rs.Mux)
authrest.RegisterTxRoutes(rs.CliCtx, rs.Mux)
app.ModuleBasics.RegisterRESTRoutes(rs.CliCtx, rs.Mux)
}
func unlockKeyFromNameAndPassphrase(accountName, passphrase string) (emintKey emintcrypto.PrivKeySecp256k1, err error) {
keybase, err := emintkeys.NewKeyringFromHomeFlag(os.Stdin)
if err != nil {
return
}
// With keyring keybase, password is not required as it is pulled from the OS prompt
privKey, err := keybase.ExportPrivateKeyObject(accountName, passphrase)
if err != nil {
return
}
var ok bool
emintKey, ok = privKey.(emintcrypto.PrivKeySecp256k1)
if !ok {
panic(fmt.Sprintf("invalid private key type: %T", privKey))
}
return
}