7b77e9986c
This contains a little tool that can make requests to the Google Maps API for distance matrix lookups from Fundu results to Schiphol Airport and Amsterdam Centraal. <3 edef!
108 lines
2.6 KiB
Go
108 lines
2.6 KiB
Go
// Amsterdump is a small program that populates a BigQuery table with
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// a matrix of origin points scattered around Amsterdam and each
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// respective points travel time to a given destination.
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//
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// The two destinations used here are the Schiphol Airport and
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// Amsterdam Central station.
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//
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// To accomplish this the Google Maps Distance Matrix API [1] is
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// queried with the points. A visualisation is later done using
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// BigQuery GeoViz[2].
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//
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// [1]: https://developers.google.com/maps/documentation/distance-matrix/start#quotas
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// [2]: https://bigquerygeoviz.appspot.com/
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package main
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import (
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"context"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"googlemaps.github.io/maps"
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)
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func failOn(err error, msg string) {
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if err != nil {
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log.Fatalln(msg, err)
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}
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}
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type LocationResult struct {
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Address string `json:"address"`
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URL string `json:"url"`
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Schiphol *maps.DistanceMatrixElement `json:"schiphol"`
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Centraal *maps.DistanceMatrixElement `json:"centraal"`
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}
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type Listing struct {
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URL string `json:"url"`
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Address string `json:"address"`
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}
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func requestMatrix(ctx context.Context, client *maps.Client, listings []Listing) {
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origins := make([]string, len(listings))
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for i, l := range listings {
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origins[i] = l.Address
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}
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request := &maps.DistanceMatrixRequest{
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Mode: maps.TravelModeTransit,
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Units: maps.UnitsMetric,
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Origins: origins,
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Destinations: []string{
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"Schiphol Airport",
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"Amsterdam Centraal",
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},
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}
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response, err := client.DistanceMatrix(ctx, request)
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failOn(err, "could not retrieve distance matrix:")
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for idx, addr := range response.OriginAddresses {
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result := LocationResult{
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Address: addr,
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URL: listings[idx].URL,
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Schiphol: response.Rows[idx].Elements[0],
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Centraal: response.Rows[idx].Elements[1],
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}
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j, _ := json.Marshal(result)
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fmt.Println(string(j))
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}
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}
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func main() {
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var listings []Listing
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input, err := ioutil.ReadFile("fun/amsterdump/input.json")
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failOn(err, "could not read input file:")
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err = json.Unmarshal(input, &listings)
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failOn(err, "could not deserialise listings:")
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ctx := context.Background()
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apiKey = os.Getenv("MAPS_API_KEY", "")
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if apiKey == "" {
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log.Fatalln("API key must be supplied via MAPS_API_KEY")
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}
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client, err := maps.NewClient(maps.WithAPIKey(apiKey))
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failOn(err, "could not create Google Maps API client:")
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var chunk []Listing
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for _, l := range listings {
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if len(chunk) == 25 {
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requestMatrix(ctx, client, chunk)
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chunk = []Listing{}
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} else {
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chunk = append(chunk, l)
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}
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}
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if len(chunk) > 1 {
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requestMatrix(ctx, client, chunk)
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}
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}
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