feat: gRPC server for TxStatus endpoint (backport #3754) (#3755)

Closes: #3753

This in some ways ties into
https://github.com/celestiaorg/celestia-app/issues/3421<hr>This is an
automatic backport of pull request #3754 done by
[Mergify](https://mergify.com).

---------

Co-authored-by: Callum Waters <[email protected]>

app/app.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"path/filepath"
 
+	celestiatx "github.com/celestiaorg/celestia-app/app/grpc/tx"
 	"github.com/celestiaorg/celestia-app/x/mint"
 	mintkeeper "github.com/celestiaorg/celestia-app/x/mint/keeper"
 	minttypes "github.com/celestiaorg/celestia-app/x/mint/types"
@@ -682,11 +683,13 @@ func (app *App) RegisterAPIRoutes(apiSvr *api.Server, _ config.APIConfig) {
 
 	// Register the
 	ModuleBasics.RegisterGRPCGatewayRoutes(clientCtx, apiSvr.GRPCGatewayRouter)
+	celestiatx.RegisterGRPCGatewayRoutes(clientCtx, apiSvr.GRPCGatewayRouter)
 }
 
 // RegisterTxService implements the Application.RegisterTxService method.
 func (app *App) RegisterTxService(clientCtx client.Context) {
 	authtx.RegisterTxService(app.BaseApp.GRPCQueryRouter(), clientCtx, app.BaseApp.Simulate, app.interfaceRegistry)
+	celestiatx.RegisterTxService(app.BaseApp.GRPCQueryRouter(), clientCtx, app.interfaceRegistry)
 }
 
 // RegisterTendermintService implements the Application.RegisterTendermintService method.

app/grpc/tx/server.go

@@ -0,0 +1,81 @@
+package tx
+
+import (
+	"context"
+	"encoding/hex"
+
+	"github.com/cosmos/cosmos-sdk/client"
+	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
+	gogogrpc "github.com/gogo/protobuf/grpc"
+	"github.com/grpc-ecosystem/grpc-gateway/runtime"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// RegisterTxService registers the tx service on the gRPC router.
+func RegisterTxService(
+	qrt gogogrpc.Server,
+	clientCtx client.Context,
+	interfaceRegistry codectypes.InterfaceRegistry,
+) {
+	RegisterTxServer(
+		qrt,
+		NewTxServer(clientCtx, interfaceRegistry),
+	)
+}
+
+// RegisterGRPCGatewayRoutes mounts the tx service's GRPC-gateway routes on the
+// given Mux.
+func RegisterGRPCGatewayRoutes(clientConn gogogrpc.ClientConn, mux *runtime.ServeMux) {
+	err := RegisterTxHandlerClient(context.Background(), mux, NewTxClient(clientConn))
+	if err != nil {
+		panic(err)
+	}
+}
+
+var _ TxServer = &txServer{}
+
+type txServer struct {
+	clientCtx         client.Context
+	interfaceRegistry codectypes.InterfaceRegistry
+}
+
+func NewTxServer(clientCtx client.Context, interfaceRegistry codectypes.InterfaceRegistry) TxServer {
+	return &txServer{
+		clientCtx:         clientCtx,
+		interfaceRegistry: interfaceRegistry,
+	}
+}
+
+// TxStatus implements the TxServer.TxStatus method proxying to the underlying celestia-core RPC server
+func (s *txServer) TxStatus(ctx context.Context, req *TxStatusRequest) (*TxStatusResponse, error) {
+	if req == nil {
+		return nil, status.Error(codes.InvalidArgument, "request cannot be nil")
+	}
+
+	if len(req.TxId) == 0 {
+		return nil, status.Error(codes.InvalidArgument, "tx id cannot be empty")
+	}
+
+	node, err := s.clientCtx.GetNode()
+	if err != nil {
+		return nil, err
+	}
+
+	txID, err := hex.DecodeString(req.TxId)
+	if err != nil {
+		return nil, status.Errorf(codes.InvalidArgument, "invalid tx id: %s", err)
+	}
+
+	resTx, err := node.TxStatus(ctx, txID)
+	if err != nil {
+		return nil, err
+	}
+
+	return &TxStatusResponse{
+		Height:        resTx.Height,
+		Index:         resTx.Index,
+		ExecutionCode: resTx.ExecutionCode,
+		Status:        resTx.Status,
+	}, nil
+}