added routing.py

amarillo/plugins/enhancer/services/routing.py

@@ -0,0 +1,47 @@
+import requests
+import logging
+
+logger = logging.getLogger(__name__)
+
+class RoutingException(Exception):
+    def __init__(self, message):
+        # Call Exception.__init__(message)
+        # to use the same Message header as the parent class
+        super().__init__(message)
+
+class RoutingService():
+    def __init__(self, gh_url = 'https://api.mfdz.de/gh'):
+        self.gh_service_url = gh_url
+
+    def path_for_stops(self, points):
+    	# Retrieve graphhopper route traversing given points
+        directions = self._get_directions(points)
+        if directions and len(directions.get("paths"))>0:
+            return directions.get("paths")[0] 
+        else:
+            return {}
+	
+    def _get_directions(self, points):
+        req_url = self._create_url(points, True, True)
+        logger.debug("Get directions via: {}".format(req_url))
+        response = requests.get(req_url)
+        status = response.status_code
+        if status == 200:
+            # Found route between points
+            return response.json()
+        else:
+            try:
+                message = response.json().get('message')
+            except:
+                raise RoutingException("Get directions failed with status code {}".format(status))
+            else:
+                raise RoutingException(message)
+
+    def _create_url(self, points, calc_points = False, instructions = False):
+        """ Creates GH request URL """
+        locations = ""
+        for point in points:
+            locations += "point={0}%2C{1}&".format(point.y, point.x)
+            
+        return "{0}/route?{1}instructions={2}&calc_points={3}&points_encoded=false".format(
+            self.gh_service_url, locations, instructions, calc_points)    

amarillo/plugins/enhancer/services/trips.py

@@ -1,7 +1,7 @@
 from amarillo.models.gtfs import GtfsTimeDelta, GtfsStopTime
 from amarillo.models.Carpool import MAX_STOPS_PER_TRIP, Carpool, Weekday, StopTime, PickupDropoffType
 from amarillo.plugins.enhancer.services.gtfs_constants import *
-from amarillo.services.routing import RoutingService, RoutingException
+from amarillo.plugins.enhancer.services.routing import RoutingService, RoutingException
 from amarillo.plugins.enhancer.services.stops import is_carpooling_stop
 from amarillo.utils.utils import assert_folder_exists, is_older_than_days, yesterday, geodesic_distance_in_m
 from amarillo.models.Carpool import Driver, RidesharingInfo