feat: add alternates to valhalla (#152)

mthh · web-flow · commit 665fdf9b40fb · 2025-11-07T13:07:10.000+01:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -13,7 +13,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Added a `km` and a `mi` property to `Direction` class to get the distance in kilometers and miles ([#139](https://github.com/gis-ops/routingpy/issues/139)).
   Distance stored in `Direction.distance` are always in meters.
 - Added a `pred_edge_id` property to `Edge` class that is used in `Expansions`.
-- `geotiff` support for Valhalla's isochrones ([#150](https://github.com/mthh/routingpy/pull/150))
+- Added `geotiff` support for Valhalla's isochrones ([#150](https://github.com/mthh/routingpy/pull/150)).
+- Added `alternates` support for Valhalla's directions ([#152](https://github.com/mthh/routingpy/pull/152)).
 
 ### Fixed
 
@@ -23,7 +24,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Added missing support for `kwargs` to Valhalla's `matrix` creation function ([#135](https://github.com/mthh/routingpy/pull/135))
 - Fixed Valhalla's `expansion` method to follow the latest Valhalla API changes ([#142](https://github.com/mthh/routingpy/pull/142))
 - Updating params with `kwargs` [#145](https://github.com/mthh/routingpy/pull/145)
-- Relative import so submoduling works ([#150](https://github.com/mthh/routingpy/pull/150))
+- Relative import so submoduling works ([#151](https://github.com/mthh/routingpy/pull/151))
 
 ### Removed
 
diff --git a/routingpy/routers/valhalla.py b/routingpy/routers/valhalla.py
@@ -21,7 +21,7 @@
 from .. import utils
 from ..client_base import DEFAULT
 from ..client_default import Client
-from ..direction import Direction
+from ..direction import Direction, Directions
 from ..expansion import Edge, Expansions
 from ..isochrone import Isochrone, Isochrones
 from ..matrix import Matrix
@@ -122,6 +122,7 @@ def directions(
         avoid_locations: Optional[List[List[float]]] = None,
         avoid_polygons: Optional[List[List[List[float]]]] = None,
         date_time: Optional[dict] = None,
+        alternatives: Optional[int] = None,
         id: Optional[Union[str, int, float]] = None,
         dry_run: Optional[bool] = None,
         **kwargs
@@ -172,6 +173,11 @@ def directions(
             in ISO 8601 format (YYYY-MM-DDThh:mm), local time.
             E.g. date_time = {type: 0, value: 2021-03-03T08:06:23}
 
+        :param int alternatives: The amount of alternatives to request. Note, with 1 you should get 2 routes.
+            Also note that there may be no alternates or less alternates than what is requested and that
+            alternates are not yet supported on routes with more than 2 locations.
+            Default 0.
+
         :param id: Name your route request. If id is specified, the naming will be sent thru to the response.
 
         :param dry_run: Print URL and parameters without sending the request.
@@ -193,12 +199,14 @@ def directions(
             avoid_locations,
             avoid_polygons,
             date_time,
+            alternatives,
             id,
             **kwargs
         )
 
         return self.parse_direction_json(
-            self.client._request("/route", post_params=params, dry_run=dry_run)
+            self.client._request("/route", post_params=params, dry_run=dry_run),
+            alternatives,
         )
 
     @staticmethod
@@ -213,6 +221,7 @@ def get_direction_params(
         avoid_locations=None,
         avoid_polygons=None,
         date_time=None,
+        alternatives=None,
         id=None,
         **kwargs
     ):
@@ -249,6 +258,9 @@ def get_direction_params(
         if date_time:
             params["date_time"] = date_time
 
+        if alternatives:
+            params["alternates"] = alternatives
+
         if id:
             params["id"] = id
 
@@ -263,19 +275,29 @@ def get_direction_params(
         return params
 
     @staticmethod
-    def parse_direction_json(response):
+    def parse_direction_json(response, alternatives):
         if response is None:  # pragma: no cover
-            return Direction()
+            return Directions() if alternatives else Direction()
+
+        directions = []
+        routes = [response] if not alternatives else [response] + response.get("alternates", [])
 
-        geometry, duration, distance = [], 0, 0
-        for leg in response["trip"]["legs"]:
-            geometry.extend(utils.decode_polyline6(leg["shape"]))
-            duration += leg["summary"]["time"]
-            distance += leg["summary"]["length"]
+        for route in routes:
+            geometry, duration, distance = [], 0, 0
+            for leg in route["trip"]["legs"]:
+                geometry.extend(utils.decode_polyline6(leg["shape"]))
+                duration += leg["summary"]["time"]
+                distance += leg["summary"]["length"]
 
-        distance *= 1000  # convert to meters
+            distance *= 1000  # convert to meters
+
+            directions.append(
+                Direction(
+                    geometry=geometry, duration=int(duration), distance=int(distance), raw=response
+                )
+            )
 
-        return Direction(geometry=geometry, duration=int(duration), distance=int(distance), raw=response)
+        return Directions(directions, response) if alternatives else directions[0]
 
     def isochrones(  # noqa: C901
         self,
diff --git a/tests/data/mock.py b/tests/data/mock.py
@@ -48,6 +48,95 @@
             },
             "units": "kilometers",
         },
+        "alternatives": {
+            "trip": {
+                "locations": [
+                    {"type": "break", "lat": 42.358528, "lon": -83.2714, "original_index": 0},
+                    {"type": "break", "lat": 42.43892, "lon": -82.749855, "original_index": 1},
+                ],
+                "legs": [
+                    {
+                        "summary": {
+                            "has_time_restrictions": False,
+                            "has_toll": False,
+                            "has_highway": False,
+                            "has_ferry": False,
+                            "min_lat": 42.350438,
+                            "min_lon": -83.275885,
+                            "max_lat": 42.456438,
+                            "max_lon": -82.869245,
+                            "time": 2308.26,
+                            "length": 46.176,
+                            "cost": 3735.242,
+                        },
+                        "shape": "_ojxoAjmny}CpzAuA~EETt_@Tjj@P|]H~OHpRDvGNxLBnBFrDJ|J}EfA_@VsK`EaH~BiFpBqKbE}B~@q@TiC|@iHvB_FpAgGnAqKhBqQpAsIP_KPgQZq_@b@ic@\\sGHwBBiMFuf@~@ic@`@}GJ}TVmMNmOPkCBkSTa]^iDDeEFeGHgFJ_ED}HL_IJmABgCDeA@mLNuCG}`@VgLX}Qb@mIRk_@v@_[p@ka@ZqIDgLH_DD}W`@_A@oJPwEDoKJcVVog@f@aK@sE?aXBqC@}HKoEIe_@m@aCCeMG{F?{S_@wx@yAga@s@cLS_AA}FGwCCurAoAsEA}@Eqb@?_V]oK?egAdB{ENmw@Nif@vBmDHg^~AmPr@yDNcCRgDZeL~@on@nAyWtAsa@zEsIbAiFl@cHj@eDJySn@oFP{\\fAuMR_FHG{FI_IQcQGyFE{IyB}]i@sH}GwlAwD}q@kE{w@gDkaA}Hu{@}@qh@Q_f@?enA@oo@@qbA^uaBb@{eBxAigAt@ge@hAihCz@kr@dAilETg_AKspAGeoA]wv@eBcyDDgNDyI^iStD}q@nCwWpDkWzBkMxB{K|FsV|G}UzDmLbEcL`JgTfHyN`FeJ|HiMlIsLjv@saA|tAy_Bj]}c@hj@a{@jLyQ|GwKvNsWvMuVvWii@`IoQhHuQrQ{h@jFgS~CaOrEkVzCcTpCoVrCoW~@gQl@eQpAak@p@g`@d@g`@\\kk@Dub@Ge`@We`@q@ek@w@ca@gAcb@cDq~@gBs_@_Cub@eJcvAyBw_@sFa}@aDobAs@a_@e@}_AMqp@AmXU_b@[gvDm@_zAgB_vAyAks@mAyo@e@gQgB_y@e@qXo@kRy@wi@_Ake@]kW_@ux@Gw}@Iqe@S{k@K{uEYorAQg~AOk}AYm[mA{ZaB}W_BeRwBoReEuWyEwToEmRkEgOcJg[{AgGioAqdFmOeq@eMsm@eJwh@iIsf@cs@cgF_Kkt@a~@y_HuB_Pqb@{bDuGuh@yC_\\gAmLqC}_@gC{_@iDov@_A_WeAcc@s@}w@Fay@`@wnBX_cA?_ZDu{ELwt@CiYDa`@x@_f@z@qXpAiYhAaRtBqYtBsSvBoR|B{QpCkRhA{GzB{LvF}YfEoQnGkXrOqi@rJcY|\\yw@|G{LbCyFjKqRdR_XzQyUdJcKbLaKlZkTxPaKlHoDpOyHfKcE|UsGn\\gHhSaCfTo@vES|JM|JBvO`@dRLth@Bp_BxDdo@\\j\\{@jq@uDzSyCzMeC`TcElQaFbTaHvZwLzMgGvZcPlOgJjRiM|KsI|UcSh]e`@xWg^|JwQ|I_QpOm]|Ke\\jQao@te@ugB~V{_A|Jg_@bs@kjCzWqaAnS_w@v_@}vAbMae@hg@}jBnM_f@``@kwAzb@a_B~AsGzF}TnTku@jm@crBdl@{iBl\\ojAxf@oaBpm@{pBxGcUzc@cmAhe@snAhToj@|t@_mBtSoi@|EcMbSgi@bPof@lL_c@vWckAzNmt@rKkj@pJ{UbJu`@xJc^fMy_@vLiXhMcWvKoSnL}QfIaLhGgHpGcG`BaBbGgH`HkGjQmPfFkF~BwDlD{FrDqIlD_LlCiOhAaLrCs_@dDkd@lJ_sAF{DBqBIwHmBaUoAcG{HuXqHyWaEyN{^awAwHyWsHqRigAu_FotAurGmZuqAmXqpA{Mih@u^ihAs\\{w@yWyh@_CyEcMgUsgA_tByIoPspA{`Cqk@}`Aa^ol@wEeH}Usa@_t@eoAse@u|@{h@ukAcAkC_KsWuYuu@kXmr@aFmMaCgGwa@yjAgPmg@_BqE_c@iyA}IkZuPin@wWa~@eRim@mUeo@kYyo@sH_Po^qp@eKaQiVqc@qNmVoDoGgTw_@mLwSao@qjAwB}DoFoJuO_[gQu^eQaa@_GyOel@wjBgYcfAqNsk@wMki@maB{mGaO}i@e\\wnAkb@y|AySi{@og@moB}CuLi]mrAeHyUiS}i@mQq`@s\\mk@sVo\\i]g]}]aXmMwJqFsDoIeFgUgNcPuIwZgUqSiQkJoJ}IeKeXo`@eFsI}E}IkL{VqEaLiFyNsDoLsG_VuFcW_EiUgBiLaVkqBwSykByIqu@cJkp@wHwe@}Hea@eP_r@gNyf@u]{mAwPin@aNme@{S_r@q~@gzCeVmy@sr@o`Co@}BmX{bAkH{WwNqm@}Oiv@mCiP{Jwm@kBmLm[ahDqB{\\yAks@iA}dANk`@\\ixACwf@e@kh@oA}e@yC{h@}Fag@mEw]_EiWsGy]}DuQwJo`@sK{^{Xgz@s]_o@}P_YaT{[cIeLiS{Z_I}KokAycB}OwUaKkPaJkPyMeXoGoN}V}x@cOq`@oHuYyh@alCmYkxAw~@sxEg[uiBso@}kEeLqz@iDeUoGq^kGya@iOo}@eEqW{EmZcV}zAwHed@iRcdA{^igBiRc~@{hAinFsWwpAeTgeAcHu_@kHmd@cFaZ_WwfBoLep@yIs^iUuu@cDkJgg@ygAcUm_@mHqKsH}KydA{{AcgAw~Awd@aq@mEqGy_AusAaCmD{`@al@yp@qbAmpA{kBMUsPiWgSw]q]wp@eJoR{ByFcHgPoGkOw`@qbAaMuYyT{e@{IqO_Vma@yL_RuNqSmVs[gL}M{BiCcUcUwToSq[gX{u@yi@cf@{\\ifBcpAej@s`@gJkHeYmSyp@gg@y[qTs[oTccAim@gjBqdAigAii@yb@eUaQ_J}dAwi@k`@_Q}f@gRmdC_z@wf@qPysEa}Ag]kLmw@_WwTaHaTmJmbAgb@{QiJgUwM{GuBmDiAyMiEwKmD{Bo@aEiAiDaA|@iGf@{DrAyJNkA`@yCdAeI`DoVlZmrBzD{W~c@yzCj@sDb@wCbJgn@dJqm@rFg_@x@gFfS{yA~@{GlB{M|@wFlDuUvIum@nBqQpAwQn@eKq@iGnK_s@nRapAhBwLj`@uiCvPqhAjP{eAzPoiAbN_`AdPcgAnIak@`Jim@|Kut@t@qFxEk[pGyb@tAgJbJim@nHmf@bDeTzGqd@`G}^n@eEvDsVzEk[|CkSrAwInI_j@zJso@rQaiAfCiPr@kErDuUbDoSrl@q_EdKwq@bQmoAdBaN`Q{lA^eGXcIwF}@yDo@{BWs^cEgAMaI}@iX_CcW_@ca@`@iFF{CBaj@AgB?sICqNQoJKqMOqBCoRWuBCeKM{T[iDE_DFuHP}UbAaDLqWfA}UbAiWbAwETcFRoDDmFFsAEeBK{IkA_KiCi@OsQwDiTiGsScGqDaA{N}DqQ{E}PuEoh@mNqIaC}b@}Lq^{Jo^{JmTaGyTgG_Y_I{MwDqLeDaFqAiZ{Hy@Suj@mNeHaBiKaCyS}EqCq@mU_GcLqA_T}@gLtB{An@iFrBkHfF{HtHgFvGqGfMyDxLqBpK_QxdAyClQnFbDtAkJ~BmOlDiPdJih@_G}EuRsGiBWwUmDqLa@k^bAeNw@qPkBwLuGiJ_NmD{Ky@wNdCuPrPcX~^_l@vNgd@rLo\\rImNdVgP`LuHzMyH",
+                    }
+                ],
+                "summary": {
+                    "has_time_restrictions": False,
+                    "has_toll": False,
+                    "has_highway": True,
+                    "has_ferry": False,
+                    "min_lat": 42.350438,
+                    "min_lon": -83.275885,
+                    "max_lat": 42.456438,
+                    "max_lon": -82.869245,
+                    "time": 2308.26,
+                    "length": 46.176,
+                    "cost": 3735.242,
+                },
+                "status_message": "Found route between points",
+                "status": 0,
+                "units": "kilometers",
+                "language": "en-US",
+            },
+            "alternates": [
+                {
+                    "trip": {
+                        "locations": [
+                            {"type": "break", "lat": 42.358528, "lon": -83.2714, "original_index": 0},
+                            {"type": "break", "lat": 42.43892, "lon": -82.749855, "original_index": 1},
+                        ],
+                        "legs": [
+                            {
+                                "summary": {
+                                    "has_time_restrictions": False,
+                                    "has_toll": False,
+                                    "has_highway": False,
+                                    "has_ferry": False,
+                                    "min_lat": 42.356887,
+                                    "min_lon": -83.275885,
+                                    "max_lat": 42.496507,
+                                    "max_lon": -82.869245,
+                                    "time": 2837.547,
+                                    "length": 54.324,
+                                    "cost": 4493.543,
+                                },
+                                "shape": 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+                            }
+                        ],
+                        "summary": {
+                            "has_time_restrictions": False,
+                            "has_toll": False,
+                            "has_highway": True,
+                            "has_ferry": False,
+                            "min_lat": 42.356887,
+                            "min_lon": -83.275885,
+                            "max_lat": 42.496507,
+                            "max_lon": -82.869245,
+                            "time": 2837.547,
+                            "length": 54.324,
+                            "cost": 4493.543,
+                        },
+                        "status_message": "Found route between points",
+                        "status": 0,
+                        "units": "kilometers",
+                        "language": "en-US",
+                    }
+                }
+            ],
+            "id": "some_route",
+        },
         "isochrones": {
             "type": "FeatureCollection",
             "bbox": [8.688474, 8.681829, 49.42577, 49.420176],
@@ -1166,6 +1255,12 @@
             "somerandom": "option",
             "units": "kilometers",
         },
+        "alternatives": {
+            "locations": [[-83.271400, 42.358528], [-82.749855, 42.43892]],
+            "profile": "auto",
+            "id": "some_route",
+            "alternatives": 1,
+        },
         "isochrones": {
             "locations": PARAM_POINT,
             "options": {
@@ -1303,6 +1398,14 @@
             "somerandom": "option",
             "units": "kilometers",
         },
+        "alternatives": {
+            "locations": [{"lat": 42.358528, "lon": -83.271400}, {"lat": 42.43892, "lon": -82.749855}],
+            "costing": "auto",
+            "units": "kilometers",
+            "id": "some_route",
+            "narrative": False,
+            "alternates": 1,
+        },
         "isochrones": {
             "locations": [{"lat": PARAM_POINT[1], "lon": PARAM_POINT[0]}],
             "costing": "auto",
diff --git a/tests/test_valhalla.py b/tests/test_valhalla.py
