Problem: default gRPC init configuration bound to 0.0.0.0 (#665) (fixes

#586)

Solution: Add customAppConfig support that configures gRPC listening addresses

cmd/chain-maind/app/app.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	conf "github.com/cosmos/cosmos-sdk/client/config"
+	serverconfig "github.com/cosmos/cosmos-sdk/server/config"
 
 	"github.com/imdario/mergo"
 	"github.com/spf13/cast"
@@ -74,7 +75,9 @@ func NewRootCmd() (*cobra.Command, params.EncodingConfig) {
 				return err
 			}
 
-			return server.InterceptConfigsPreRunHandler(cmd, "", nil)
+			customAppTemplate, customAppConfig := initAppConfig()
+
+			return server.InterceptConfigsPreRunHandler(cmd, customAppTemplate, customAppConfig)
 		},
 	}
 
@@ -83,6 +86,28 @@ func NewRootCmd() (*cobra.Command, params.EncodingConfig) {
 	return rootCmd, encodingConfig
 }
 
+// initAppConfig helps to override default appConfig template and configs.
+// return "", nil if no custom configuration is required for the application.
+func initAppConfig() (string, interface{}) {
+	// The following code snippet is just for reference.
+
+	type CustomAppConfig struct {
+		serverconfig.Config
+	}
+
+	// Optionally allow the chain developer to overwrite the SDK's default
+	// server config.
+	srvCfg := serverconfig.DefaultConfig()
+	srvCfg.GRPC.Address = "127.0.0.1:9090"
+	srvCfg.GRPCWeb.Address = "127.0.0.1:9091"
+
+	customAppConfig := CustomAppConfig{
+		Config: *srvCfg,
+	}
+
+	return serverconfig.DefaultConfigTemplate, customAppConfig
+}
+
 func initRootCmd(rootCmd *cobra.Command, encodingConfig params.EncodingConfig) {
 	// authclient.Codec = encodingConfig.Marshaler
 	cfg := sdk.GetConfig()