fix(server): don't hardcode grpc address to localhost (backport #18254) (#18258)

Co-authored-by: Julien Robert <julien@rbrt.fr>

CHANGELOG.md

@@ -53,6 +53,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Bug Fixes
 
+* (server) [#18254](https://github.com/cosmos/cosmos-sdk/pull/18254) Don't hardcode gRPC address to localhost.
 * (x/gov) [#18173](https://github.com/cosmos/cosmos-sdk/pull/18173) Gov hooks now return an error and are *blocking* when they fail. Expect for `AfterProposalFailedMinDeposit` and `AfterProposalVotingPeriodEnded` which log the error and continue.
 * (x/gov) [#17873](https://github.com/cosmos/cosmos-sdk/pull/17873) Fail any inactive and active proposals that cannot be decoded.
 * (x/slashing) [#18016](https://github.com/cosmos/cosmos-sdk/pull/18016) Fixed builder function for missed blocks key (`validatorMissedBlockBitArrayPrefixKey`) in slashing/migration/v4
@@ -402,4 +403,4 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## Previous Versions
 
-[CHANGELOG of previous versions](https://github.com/cosmos/cosmos-sdk/blob/main/CHANGELOG.md#v0470---2023-03-14).
+[CHANGELOG of previous versions](https://github.com/cosmos/cosmos-sdk/blob/main/CHANGELOG.md#v0470---2023-03-14).

server/start.go

@@ -472,7 +472,7 @@ func startGrpcServer(
 		// return grpcServer as nil if gRPC is disabled
 		return nil, clientCtx, nil
 	}
-	_, port, err := net.SplitHostPort(config.Address)
+	_, _, err := net.SplitHostPort(config.Address)
 	if err != nil {
 		return nil, clientCtx, err
 	}
@@ -487,11 +487,9 @@ func startGrpcServer(
 		maxRecvMsgSize = serverconfig.DefaultGRPCMaxRecvMsgSize
 	}
 
-	grpcAddress := fmt.Sprintf("127.0.0.1:%s", port)
-
 	// if gRPC is enabled, configure gRPC client for gRPC gateway
 	grpcClient, err := grpc.Dial(
-		grpcAddress,
+		config.Address,
 		grpc.WithTransportCredentials(insecure.NewCredentials()),
 		grpc.WithDefaultCallOptions(
 			grpc.ForceCodec(codec.NewProtoCodec(clientCtx.InterfaceRegistry).GRPCCodec()),
@@ -504,7 +502,7 @@ func startGrpcServer(
 	}
 
 	clientCtx = clientCtx.WithGRPCClient(grpcClient)
-	svrCtx.Logger.Debug("gRPC client assigned to client context", "target", grpcAddress)
+	svrCtx.Logger.Debug("gRPC client assigned to client context", "target", config.Address)
 
 	grpcSrv, err := servergrpc.NewGRPCServer(clientCtx, app, config)
 	if err != nil {