THRIFT-4098 Namespace support for generated Rust code (#2348)

Client: rs
diff --git a/lib/rs/test_recursive/src/lib.rs b/lib/rs/test_recursive/src/lib.rs
new file mode 100644
index 0000000..bac37b4
--- /dev/null
+++ b/lib/rs/test_recursive/src/lib.rs
@@ -0,0 +1,276 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#![allow(dead_code)]
+
+pub mod transit;
+pub mod vehicles;
+pub mod maintenance;
+
+mod server {
+    use crate::maintenance::maintenance_facility::{
+        BigBarnSyncHandler, MultimodalFacilitySyncHandler,
+    };
+    use crate::transit::buses::{Bus, GarageSyncHandler};
+    use crate::transit::buses::{Powertrain, Route as BusRoute};
+    use crate::transit::light::streetcars::{
+        BarnSyncHandler, Flexity, RollingStock, Route, RouteNumber, Streetcar,
+    };
+    use crate::transit::services::city_services::TransitImprovements;
+    use crate::transit::trains::Locomotive;
+    use crate::transit::transporters::{FlatcarConsist, SingleVehicleTransporter};
+    use crate::vehicles::Material;
+    use thrift::Result;
+
+    //
+    // implement a whole bunch of handler methods just to make sure I can, and that everything compiles
+    //
+
+    pub struct AllInOneHandler;
+
+    impl BigBarnSyncHandler for AllInOneHandler {
+        fn handle_add_streetcar(&self, route: Route) -> Result<Streetcar> {
+            if let Some(route_number) = route.id {
+                match route_number {
+                    RouteNumber::LAKESHORE => Ok(Streetcar {
+                        id: Some(4417),
+                        stock: Some(RollingStock::Flexity(Flexity {
+                            materials: Some(vec![Material::STEEL, Material::ALUMINUM]),
+                            locomotive: Some(Locomotive::ELECTRIC_PANTOGRAPH),
+                        })),
+                        route: Some(Route {
+                            id: Some(RouteNumber::LAKESHORE),
+                            improvements: None,
+                        }),
+                    }),
+                    _ => Err(thrift::Error::from(format!(
+                        "Cannot create streetcar for route number {}",
+                        route_number.0
+                    ))),
+                }
+            } else {
+                Err(thrift::Error::from("Can't add a streetcar"))
+            }
+        }
+    }
+
+    impl BarnSyncHandler for AllInOneHandler {
+        fn handle_upgrade_streetcar(&self, streetcar: Streetcar) -> Result<Streetcar> {
+            if let Some(rolling_stock) = streetcar.stock {
+                match rolling_stock {
+                    RollingStock::Clrv(_) => Ok(Streetcar {
+                        stock: Some(RollingStock::Flexity(Flexity {
+                            materials: Some(vec![Material::STEEL, Material::ALUMINUM]),
+                            locomotive: Some(Locomotive::ELECTRIC_PANTOGRAPH),
+                        })),
+                        ..streetcar
+                    }),
+                    RollingStock::Flexity(_) => {
+                        Err(thrift::Error::from("Streetcar already upgraded"))
+                    }
+                }
+            } else {
+                Err(thrift::Error::from("Can't upgrade streetcar"))
+            }
+        }
+    }
+
+    impl MultimodalFacilitySyncHandler for AllInOneHandler {
+        fn handle_build_transporter(
+            &self,
+            source: String,
+            destination: String,
+            consist: FlatcarConsist,
+        ) -> Result<SingleVehicleTransporter> {
+            Ok(SingleVehicleTransporter {
+                consist: Some(consist),
+                source: Some(source),
+                destination: Some(destination),
+            })
+        }
+    }
+
+    impl GarageSyncHandler for AllInOneHandler {
+        fn handle_upgrade_bus(&self, bus: Bus) -> Result<Bus> {
+            if let Some(p) = bus.powertrain {
+                match p {
+                    Powertrain::COMPRESSED_NATURAL_GAS => Ok(Bus {
+                        powertrain: Some(Powertrain::DIESEL),
+                        ..bus
+                    }),
+                    _ => Err(thrift::Error::from("Cannot upgrade from this powertrain")),
+                }
+            } else {
+                Err(thrift::Error::from("Cannot upgrade bus"))
+            }
+        }
+
+        fn handle_improvements_for_route(
+            &self,
+            route: BusRoute,
+        ) -> Result<Vec<TransitImprovements>> {
+            Ok(route
+                .improvements
+                .expect("Expecting a list of improvements"))
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+
+    //
+    // TODO: consider using the generated client/server and doing a round-trip
+    //
+
+    use crate::server::AllInOneHandler;
+    use crate::transit::buses::{Bus, Powertrain, Route as BusRoute, DEFAULT4WHEELCAPACITY};
+    use crate::transit::light::light_rail::Lrt;
+    use crate::transit::light::streetcars::{
+        BarnSyncHandler, Flexity, RollingStock, Route, RouteNumber, Streetcar, CLRV,
+    };
+    use crate::transit::services::city_services::TransitImprovements;
+    use crate::transit::trains::Locomotive;
+    use crate::transit::transporters::{FlatcarConsist, SingleVehicleTransporter};
+    use crate::vehicles::{Material, VehicleIdentifier};
+
+    use crate::maintenance::maintenance_facility::{
+        BigBarnSyncHandler, MultimodalFacilitySyncHandler,
+    };
+    use crate::transit::buses::GarageSyncHandler;
+
+    #[test]
+    fn handle_add_streetcar_compiles_and_returns_expected_value() {
+        let expected = Streetcar {
+            id: Some(4417),
+            stock: Some(RollingStock::Flexity(Flexity {
+                materials: Some(vec![Material::STEEL, Material::ALUMINUM]),
+                locomotive: Some(Locomotive::ELECTRIC_PANTOGRAPH),
+            })),
+            route: Some(Route {
+                id: Some(RouteNumber::LAKESHORE),
+                improvements: None,
+            }),
+        };
+
+        let handler = AllInOneHandler {};
+        let actual = handler
+            .handle_add_streetcar(Route {
+                id: Some(RouteNumber::LAKESHORE),
+                improvements: None,
+            })
+            .expect("Expected a result");
+
+        assert_eq!(expected, actual)
+    }
+
+    #[test]
+    fn handle_upgrade_streetcar_compiles_and_returns_expected_value() {
+        let input = Streetcar {
+            stock: Some(RollingStock::Clrv(CLRV {
+                materials: Some(vec![Material::STEEL, Material::ALUMINUM]),
+                locomotive: Some(Locomotive::ELECTRIC_POLE),
+            })),
+            id: Some(4415),
+            route: Some(Route {
+                id: Some(RouteNumber::SPADINA),
+                improvements: Some(vec![TransitImprovements::DEDICATED_RIGHT_OF_WAY]),
+            }),
+        };
+
+        let expected = Streetcar {
+            stock: Some(RollingStock::Flexity(Flexity {
+                materials: Some(vec![Material::STEEL, Material::ALUMINUM]),
+                locomotive: Some(Locomotive::ELECTRIC_PANTOGRAPH),
+            })),
+            id: Some(4415),
+            route: Some(Route {
+                id: Some(RouteNumber::SPADINA),
+                improvements: Some(vec![TransitImprovements::DEDICATED_RIGHT_OF_WAY]),
+            }),
+        };
+
+        let handler = AllInOneHandler {};
+        let actual = handler
+            .handle_upgrade_streetcar(input)
+            .expect("Expected an upgraded streetcar");
+
+        assert_eq!(expected, actual)
+    }
+
+    #[test]
+    fn handle_build_transporter_compiles_and_returns_expected_value() {
+        let consist = FlatcarConsist::Lrt(Lrt {
+            materials: Some(vec![Material::STEEL, Material::ALUMINUM]),
+            locomotive: Some(Locomotive::ELECTRIC_PANTOGRAPH),
+        });
+        let expected = SingleVehicleTransporter {
+            consist: Some(consist.clone()),
+            source: Some("905".to_owned()),
+            destination: Some("416".to_owned()),
+        };
+
+        let handler = AllInOneHandler {};
+        let actual = handler
+            .handle_build_transporter("905".to_owned(), "416".to_owned(), consist)
+            .expect("Expected a transporter");
+
+        assert_eq!(expected, actual)
+    }
+
+    #[test]
+    fn handle_upgrade_bus_compiles_and_returns_expected_value() {
+        let bus = Bus {
+            identifier: Some(VehicleIdentifier {
+                manufacturer: Some("Orion".to_owned()),
+                model: Some("Orion 07.501 NG HEV".to_owned()),
+                qualifiers: None,
+            }),
+            capacity: Some(DEFAULT4WHEELCAPACITY),
+            powertrain: Some(Powertrain::COMPRESSED_NATURAL_GAS),
+            materials: Some(vec![Material::STEEL, Material::ALUMINUM]),
+        };
+
+        let expected = Bus {
+            powertrain: Some(Powertrain::DIESEL),
+            ..(bus.clone())
+        };
+
+        let handler = AllInOneHandler {};
+        let actual = handler
+            .handle_upgrade_bus(bus)
+            .expect("Expected improved bus");
+
+        assert_eq!(expected, actual)
+    }
+
+    #[test]
+    fn handle_improvements_for_route_compiles_and_returns_expected_value() {
+        let expected = vec![TransitImprovements::TRANSIT_SIGNAL_PRIORITY];
+        let bus_route = BusRoute {
+            route_id: Some("320".to_owned()),
+            improvements: Some(expected.clone()),
+        };
+
+        let handler = AllInOneHandler {};
+        let actual = handler
+            .handle_improvements_for_route(bus_route)
+            .expect("Expected list of transit improvements");
+
+        assert_eq!(expected, actual)
+    }
+}