Implements net_version for Ethers (#121)

rpc/apis.go

@@ -36,5 +36,11 @@ func GetRPCAPIs(cliCtx context.CLIContext, key emintcrypto.PrivKeySecp256k1) []r
 			Service:   NewPublicFilterAPI(cliCtx),
 			Public:    true,
 		},
+		{
+			Namespace: "net",
+			Version:   "1.0",
+			Service:   NewPublicNetAPI(cliCtx),
+			Public:    true,
+		},
 	}
 }

rpc/net_api.go

@@ -0,0 +1,34 @@
+package rpc
+
+import (
+	"fmt"
+	"strconv"
+
+	"github.com/cosmos/cosmos-sdk/client/context"
+	"github.com/cosmos/cosmos-sdk/client/flags"
+	"github.com/spf13/viper"
+)
+
+// PublicNetAPI is the eth_ prefixed set of APIs in the Web3 JSON-RPC spec.
+type PublicNetAPI struct {
+	networkVersion uint64
+}
+
+// NewPersonalEthAPI creates an instance of the public ETH Web3 API.
+func NewPublicNetAPI(cliCtx context.CLIContext) *PublicNetAPI {
+	chainID := viper.GetString(flags.FlagChainID)
+	// parse the chainID from a integer string
+	intChainID, err := strconv.ParseUint(chainID, 0, 64)
+	if err != nil {
+		panic(fmt.Sprintf("Invalid chainID: %s, must be integer format", chainID))
+	}
+
+	return &PublicNetAPI{
+		networkVersion: intChainID,
+	}
+}
+
+// Version returns the current ethereum protocol version.
+func (s *PublicNetAPI) Version() string {
+	return fmt.Sprintf("%d", s.networkVersion)
+}