fuzzyworld

find-stone-beer / files / bing-maps.go

bing-maps.go

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1package main
2
3import (
4 "encoding/json"
5 "fmt"
6 "os"
7
8 "github.com/jftuga/geodist"
9)
10
11const (
12 BingMapsKeyEnvVar = "BING_MAPS_KEY"
13)
14
15func GetDistBetweenPoints(a, b geodist.Coord) (float64, error) {
16 dist, err := _getDistBetweenPoints(a.Lat, a.Lon, b.Lat, b.Lon)
17 return dist, err
18}
19
20func _getDistBetweenPoints(lat1, lon1, lat2, lon2 float64) (float64, error) {
21 // http://dev.virtualearth.net/REST/v1/Routes?wayPoint.1={wayPoint1}&viaWaypoint.2={viaWaypoint2}&waypoint.3={waypoint3}&wayPoint.n={waypointN}&heading={heading}&optimize={optimize}&avoid={avoid}&distanceBeforeFirstTurn={distanceBeforeFirstTurn}&routeAttributes={routeAttributes}&timeType={timeType}&dateTime={dateTime}&maxSolutions={maxSolutions}&tolerances={tolerances}&distanceUnit={distanceUnit}&key={BingMapsKey}
22
23 bingMapsKey, found := os.LookupEnv(BingMapsKeyEnvVar)
24 if !found {
25 return 0, fmt.Errorf("missing environment variable: %s", BingMapsKeyEnvVar)
26 }
27
28 url := fmt.Sprintf("http://dev.virtualearth.net/REST/v1/Routes?wayPoint.1=%f,%f&wayPoint.2=%f,%f&distanceUnit=mi&key=%s", lat1, lon1, lat2, lon2, bingMapsKey)
29 data, err := getCachedUrl(
30 url,
31 fmt.Sprintf("bing-maps-%f,%f,%f,%f", lat1, lon1, lat2, lon2),
32 "2006-01", // cache this data for 1 month
33 )
34 if err != nil {
35 return 0, err
36 }
37
38 autoGenerated := autoGenerated{}
39 err = json.Unmarshal(data, &autoGenerated)
40 if err != nil {
41 return 0, fmt.Errorf("encountered error '%s' while unmarshalling response: %s ", err, string(data))
42 }
43 resourceSets := autoGenerated.ResourceSets
44 if len(resourceSets) == 0 {
45 return 0, fmt.Errorf("no ResourceSets found in response: %s", string(data))
46 }
47 resources := resourceSets[0].Resources
48 if len(resources) == 0 {
49 return 0, fmt.Errorf("no Resources found in response: %s", string(data))
50 }
51 routeLegs := resources[0].RouteLegs
52 if len(routeLegs) == 0 {
53 return 0, fmt.Errorf("no RouteLegs found in response: %s", string(data))
54 }
55 firstLeg := routeLegs[0]
56 dist := firstLeg.TravelDistance
57 return dist, nil
58}
59
60// https://mholt.github.io/json-to-go/
61type autoGenerated struct {
62 AuthenticationResultCode string `json:"authenticationResultCode"`
63 BrandLogoURI string `json:"brandLogoUri"`
64 Copyright string `json:"copyright"`
65 ResourceSets []struct {
66 EstimatedTotal int `json:"estimatedTotal"`
67 Resources []struct {
68 Type string `json:"__type"`
69 Bbox []float64 `json:"bbox"`
70 ID string `json:"id"`
71 DistanceUnit string `json:"distanceUnit"`
72 DurationUnit string `json:"durationUnit"`
73 RouteLegs []struct {
74 ActualEnd struct {
75 Type string `json:"type"`
76 Coordinates []float64 `json:"coordinates"`
77 } `json:"actualEnd"`
78 ActualStart struct {
79 Type string `json:"type"`
80 Coordinates []float64 `json:"coordinates"`
81 } `json:"actualStart"`
82 AlternateVias []any `json:"alternateVias"`
83 Description string `json:"description"`
84 EndTime string `json:"endTime"`
85 ItineraryItems []struct {
86 CompassDirection string `json:"compassDirection"`
87 Details []struct {
88 CompassDegrees int `json:"compassDegrees"`
89 EndPathIndices []int `json:"endPathIndices"`
90 LocationCodes []string `json:"locationCodes"`
91 ManeuverType string `json:"maneuverType"`
92 Mode string `json:"mode"`
93 Names []string `json:"names"`
94 RoadType string `json:"roadType"`
95 StartPathIndices []int `json:"startPathIndices"`
96 } `json:"details"`
97 Exit string `json:"exit"`
98 IconType string `json:"iconType"`
99 Instruction struct {
100 FormattedText any `json:"formattedText"`
101 ManeuverType string `json:"maneuverType"`
102 Text string `json:"text"`
103 } `json:"instruction"`
104 IsRealTimeTransit bool `json:"isRealTimeTransit"`
105 ManeuverPoint struct {
106 Type string `json:"type"`
107 Coordinates []float64 `json:"coordinates"`
108 } `json:"maneuverPoint"`
109 RealTimeTransitDelay int `json:"realTimeTransitDelay"`
110 SideOfStreet string `json:"sideOfStreet"`
111 TollZone string `json:"tollZone"`
112 TransitTerminus string `json:"transitTerminus"`
113 TravelDistance float64 `json:"travelDistance"`
114 TravelDuration int `json:"travelDuration"`
115 TravelMode string `json:"travelMode"`
116 Hints []struct {
117 HintType string `json:"hintType"`
118 Text string `json:"text"`
119 } `json:"hints,omitempty"`
120 } `json:"itineraryItems"`
121 RouteRegion string `json:"routeRegion"`
122 RouteSubLegs []struct {
123 EndWaypoint struct {
124 Type string `json:"type"`
125 Coordinates []float64 `json:"coordinates"`
126 Description string `json:"description"`
127 IsVia bool `json:"isVia"`
128 LocationIdentifier string `json:"locationIdentifier"`
129 RoutePathIndex int `json:"routePathIndex"`
130 } `json:"endWaypoint"`
131 StartWaypoint struct {
132 Type string `json:"type"`
133 Coordinates []float64 `json:"coordinates"`
134 Description string `json:"description"`
135 IsVia bool `json:"isVia"`
136 LocationIdentifier string `json:"locationIdentifier"`
137 RoutePathIndex int `json:"routePathIndex"`
138 } `json:"startWaypoint"`
139 TravelDistance float64 `json:"travelDistance"`
140 TravelDuration int `json:"travelDuration"`
141 } `json:"routeSubLegs"`
142 StartTime string `json:"startTime"`
143 TravelDistance float64 `json:"travelDistance"`
144 TravelDuration int `json:"travelDuration"`
145 TravelMode string `json:"travelMode"`
146 } `json:"routeLegs"`
147 TrafficCongestion string `json:"trafficCongestion"`
148 TrafficDataUsed string `json:"trafficDataUsed"`
149 TravelDistance float64 `json:"travelDistance"`
150 TravelDuration int `json:"travelDuration"`
151 TravelDurationTraffic int `json:"travelDurationTraffic"`
152 TravelMode string `json:"travelMode"`
153 } `json:"resources"`
154 } `json:"resourceSets"`
155 StatusCode int `json:"statusCode"`
156 StatusDescription string `json:"statusDescription"`
157 TraceID string `json:"traceId"`
158}