fix: return 404 on non-existing tx (cosmos#10992)

CHANGELOG.md

@@ -151,6 +151,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Bug Fixes
 
+* (grpc) [\#10985](https://github.com/cosmos/cosmos-sdk/pull/10992) The `/cosmos/tx/v1beta1/txs/{hash}` endpoint returns a 404 when a tx does not exist.
 * (rosetta) [\#10340](https://github.com/cosmos/cosmos-sdk/pull/10340) Use `GenesisChunked(ctx)` instead `Genesis(ctx)` to get genesis block height
 * [#10180](https://github.com/cosmos/cosmos-sdk/issues/10180) Documentation: make references to Cosmos SDK consistent
 * [\#9651](https://github.com/cosmos/cosmos-sdk/pull/9651) Change inconsistent limit of `0` to `MaxUint64` on InfiniteGasMeter and add GasRemaining func to GasMeter.

x/auth/tx/service.go

@@ -131,10 +131,18 @@ func (s txServer) GetTx(ctx context.Context, req *txtypes.GetTxRequest) (*txtype
 		return nil, status.Error(codes.InvalidArgument, "request cannot be nil")
 	}
 
+	if len(req.Hash) == 0 {
+		return nil, status.Error(codes.InvalidArgument, "tx hash cannot be empty")
+	}
+
 	// TODO We should also check the proof flag in gRPC header.
 	// https://github.com/cosmos/cosmos-sdk/issues/7036.
 	result, err := QueryTx(s.clientCtx, req.Hash)
 	if err != nil {
+		if strings.Contains(err.Error(), "not found") {
+			return nil, status.Errorf(codes.NotFound, "tx not found: %s", req.Hash)
+		}
+
 		return nil, err
 	}
 

x/auth/tx/service_test.go

@@ -341,8 +341,8 @@ func (s IntegrationTestSuite) TestGetTx_GRPC() {
 		expErrMsg string
 	}{
 		{"nil request", nil, true, "request cannot be nil"},
-		{"empty request", &tx.GetTxRequest{}, true, "transaction hash cannot be empty"},
-		{"request with dummy hash", &tx.GetTxRequest{Hash: "deadbeef"}, true, "tx (DEADBEEF) not found"},
+		{"empty request", &tx.GetTxRequest{}, true, "tx hash cannot be empty"},
+		{"request with dummy hash", &tx.GetTxRequest{Hash: "deadbeef"}, true, "code = NotFound desc = tx not found: deadbeef"},
 		{"good request", &tx.GetTxRequest{Hash: s.txRes.TxHash}, false, ""},
 	}
 	for _, tc := range testCases {
@@ -371,12 +371,12 @@ func (s IntegrationTestSuite) TestGetTx_GRPCGateway() {
 		{
 			"empty params",
 			fmt.Sprintf("%s/cosmos/tx/v1beta1/txs/", val.APIAddress),
-			true, "transaction hash cannot be empty",
+			true, "tx hash cannot be empty",
 		},
 		{
 			"dummy hash",
 			fmt.Sprintf("%s/cosmos/tx/v1beta1/txs/%s", val.APIAddress, "deadbeef"),
-			true, "tx (DEADBEEF) not found",
+			true, "code = NotFound desc = tx not found: deadbeef",
 		},
 		{
 			"good hash",