laconicd/rpc/config.go

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package rpc
import (
"fmt"
"github.com/cosmos/cosmos-sdk/client/lcd"
"github.com/cosmos/cosmos-sdk/codec"
emintcrypto "github.com/cosmos/ethermint/crypto"
emintkeys "github.com/cosmos/ethermint/keys"
"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
}
// Web3RpcCmd creates a CLI command to start RPC server
func Web3RpcCmd(cdc *codec.Codec) *cobra.Command {
cmd := lcd.ServeCommand(cdc, registerRoutes)
// Attach flag to cmd output to be handled in registerRoutes
cmd.Flags().String(flagUnlockKey, "", "Select a key to unlock on the RPC server")
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 {
passphrase, err := emintkeys.GetPassphrase(accountName)
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)
}
}
}
rs.Mux.HandleFunc("/rpc", s.ServeHTTP).Methods("POST")
}
func unlockKeyFromNameAndPassphrase(accountName, passphrase string) (emintKey emintcrypto.PrivKeySecp256k1, err error) {
keybase, err := emintkeys.NewKeyBaseFromHomeFlag()
if err != nil {
return
}
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
}