editoast, front: forbid zero-length paths

- Editoast: treat core pathfinding responses with a length of zero as
  errors.
- Frontend, stdcm: add error notifications when the user enters the same
  origin and destination.

editoast/openapi.yaml

@@ -8435,6 +8435,14 @@ components:
             - rolling_stock_not_found
           rolling_stock_name:
             type: string
+      - type: object
+        required:
+        - error_type
+        properties:
+          error_type:
+            type: string
+            enum:
+            - zero_length_path
     PathfindingItem:
       type: object
       required:

editoast/src/core/pathfinding.rs

@@ -133,6 +133,7 @@ pub enum PathfindingInputError {
     RollingStockNotFound {
         rolling_stock_name: String,
     },
+    ZeroLengthPath,
 }
 
 // Enum for not-found results and incompatible constraints

editoast/src/views/path/pathfinding.rs

@@ -86,7 +86,12 @@ pub enum PathfindingResult {
 impl From<PathfindingCoreResult> for PathfindingResult {
     fn from(core_result: PathfindingCoreResult) -> Self {
         match core_result {
-            PathfindingCoreResult::Success(success) => PathfindingResult::Success(success),
+            PathfindingCoreResult::Success(success) => match success.length {
+                0 => PathfindingResult::Failure(PathfindingFailure::PathfindingInputError(
+                    PathfindingInputError::ZeroLengthPath,
+                )),
+                _ => PathfindingResult::Success(success),
+            },
             PathfindingCoreResult::NotFoundInBlocks {
                 track_section_ranges,
                 length,
@@ -456,6 +461,53 @@ pub mod tests {
     use crate::views::path::pathfinding::PathfindingResult;
     use crate::views::test_app::TestAppBuilder;
 
+    #[rstest]
+    async fn pathfinding_fails_when_core_responds_with_zero_length_path() {
+        let db_pool = DbConnectionPoolV2::for_tests();
+        let mut core = MockingClient::new();
+        core.stub("/v2/pathfinding/blocks")
+            .method(reqwest::Method::POST)
+            .response(StatusCode::OK)
+            .json(json!({
+                "blocks":[],
+                "routes": [],
+                "track_section_ranges": [],
+                "path_item_positions": [],
+                "length": 0,
+                "status": "success"
+            }))
+            .finish();
+        let app = TestAppBuilder::new()
+            .db_pool(db_pool.clone())
+            .core_client(core.into())
+            .build();
+        let small_infra = create_small_infra(&mut db_pool.get_ok()).await;
+
+        let request = app
+            .post(format!("/infra/{}/pathfinding/blocks", small_infra.id).as_str())
+            .json(&json!({
+                "path_items":[
+                {"trigram":"WS","secondary_code":"BV"},
+                {"trigram":"WS","secondary_code":"BV"}
+            ],
+                "rolling_stock_is_thermal":true,
+                "rolling_stock_loading_gauge":"G1",
+                "rolling_stock_supported_electrifications":[],
+                "rolling_stock_supported_signaling_systems":["BAL","BAPR"],
+                "rolling_stock_maximum_speed":22.00,
+                "rolling_stock_length":26.00
+            }));
+
+        let pathfinding_result: PathfindingResult =
+            app.fetch(request).assert_status(StatusCode::OK).json_into();
+        assert_eq!(
+            pathfinding_result,
+            PathfindingResult::Failure(PathfindingFailure::PathfindingInputError(
+                PathfindingInputError::ZeroLengthPath,
+            ))
+        );
+    }
+
     #[rstest]
     async fn pathfinding_with_invalid_path_items_returns_invalid_path_items() {
         let app = TestAppBuilder::default_app();
@@ -560,7 +612,7 @@ pub mod tests {
                 "routes": [],
                 "track_section_ranges": [],
                 "path_item_positions": [],
-                "length": 0,
+                "length": 1,
                 "status": "success"
             }))
             .finish();
@@ -593,7 +645,7 @@ pub mod tests {
                 blocks: vec![],
                 routes: vec![],
                 track_section_ranges: vec![],
-                length: 0,
+                length: 1,
                 path_item_positions: vec![]
             })
         );

editoast/src/views/stdcm_logs.rs

@@ -262,7 +262,7 @@ mod tests {
             blocks: vec![],
             routes: vec![],
             track_section_ranges: vec![],
-            length: 0,
+            length: 1,
             path_item_positions: vec![0, 10],
         }
     }

editoast/src/views/timetable/stdcm.rs

@@ -668,7 +668,7 @@ mod tests {
             blocks: vec![],
             routes: vec![],
             track_section_ranges: vec![],
-            length: 0,
+            length: 1,
             path_item_positions: vec![0, 10],
         }
     }

editoast/src/views/train_schedule.rs

@@ -945,7 +945,7 @@ mod tests {
                 "routes": [],
                 "track_section_ranges": [],
                 "path_item_positions": [0,1,2,3],
-                "length": 0,
+                "length": 1,
                 "status": "success"
             }))
             .finish();

front/public/locales/en/errors.json

@@ -91,6 +91,11 @@
         "WrongRailjsonVersionProvided": "Wrong railjson version provided"
       }
     },
+    "core": {
+      "pathfinding": {
+        "ZeroLengthPath": "Path length cannot be null."
+      }
+    },
     "infra_state": {
       "FetchError": "Error while fetching the infrastructure loading status"
     },

front/public/locales/en/stdcm.json

@@ -114,7 +114,8 @@
     "noResults": "No path found",
     "noScheduledPoint": "The calculation requires either the origin or destination schedule.",
     "pathfindingFailed": "No path have been found for these waypoints.",
-    "requestFailed": "Calculation error for last minute train path"
+    "requestFailed": "Calculation error for last minute train path",
+    "zeroLengthPath": "The path cannot have a null length."
   },
   "stdcmResults": "Results",
   "stdcmSimulationReport": "Path simulation report",

front/public/locales/fr/errors.json

@@ -91,6 +91,11 @@
         "WrongRailjsonVersionProvided": "Mauvaise version de railjson fournie"
       }
     },
+    "core": {
+      "pathfinding": {
+        "ZeroLengthPath": "La longueur d'un chemin ne peut pas être nulle."
+      }
+    },
     "infra_state": {
       "FetchError": "Erreur de récupération de l'état de chargement de l'infrastructure"
     },

front/public/locales/fr/stdcm.json

@@ -114,7 +114,8 @@
     "noResults": "Aucun sillon trouvé",
     "noScheduledPoint": "Le calcul a besoin de l'horaire d'origine ou de celui de la destination.",
     "pathfindingFailed": "Aucun chemin n'a été trouvé pour ces points de jalonnement.",
-    "requestFailed": "Erreur de calcul Sillon de dernière minute"
+    "requestFailed": "Erreur de calcul Sillon de dernière minute",
+    "zeroLengthPath": "Le chemin ne peut pas avoir de longueur nulle."
   },
   "stdcmResults": "Résultats",
   "stdcmSimulationReport": "Fiche simulation",

front/src/applications/stdcm/hooks/useStaticPathfinding.ts

@@ -58,6 +58,16 @@ const useStaticPathfinding = (infra?: InfraWithState) => {
         return;
       }
 
+      // Don't run the pathfinding if the origin and destination are the same:
+      const origin = pathSteps.at(0)!;
+      const destination = pathSteps.at(-1)!;
+      if (
+        origin.location!.uic === destination.location!.uic &&
+        origin.location!.secondary_code === destination.location!.secondary_code
+      ) {
+        return;
+      }
+
       const payload = getPathfindingQuery({
         infraId: infra.id,
         rollingStock,

front/src/applications/stdcm/types.ts

@@ -168,6 +168,7 @@ export enum StdcmConfigErrorTypes {
   PATHFINDING_FAILED = 'pathfindingFailed',
   BOTH_POINT_SCHEDULED = 'bothPointAreScheduled',
   NO_SCHEDULED_POINT = 'noScheduledPoint',
+  ZERO_LENGTH_PATH = 'zeroLengthPath',
 }
 
 export type StdcmConfigErrors = {

front/src/applications/stdcm/utils/checkStdcmConfigErrors.ts

@@ -23,6 +23,13 @@ const checkStdcmConfigErrors = (
     throw new Error('Last step can not be a via');
   }
 
+  if (
+    origin.location!.uic === destination.location!.uic &&
+    origin.location!.secondary_code === destination.location!.secondary_code
+  ) {
+    return { errorType: StdcmConfigErrorTypes.ZERO_LENGTH_PATH };
+  }
+
   if (pathfindingStateError) {
     return { errorType: StdcmConfigErrorTypes.PATHFINDING_FAILED };
   }

front/src/common/api/generatedEditoastApi.ts

@@ -2700,6 +2700,9 @@ export type PathfindingInputError =
   | {
       error_type: 'rolling_stock_not_found';
       rolling_stock_name: string;
+    }
+  | {
+      error_type: 'zero_length_path';
     };
 export type OffsetRange = {
   end: number;