mirror of
https://codeberg.org/andyscott/OpenWeather-gRPC-API.git
synced 2024-12-04 09:57:20 -05:00
123 lines
3.2 KiB
Go
123 lines
3.2 KiB
Go
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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"net/http"
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"strconv"
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pb "codeberg.org/andyscott/OpenWeather-gRPC-API/proto"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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)
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type Coordinates struct {
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Latitude float32 `json:"lat"`
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Longitude float32 `json:"lon"`
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}
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// Receives a RequestLocation message
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// Returns a SendLocation message with the Latitude and Longitude
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func (s *Server) Location(ctx context.Context, in *pb.RequestLocation) (*pb.SendLocation, error) {
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log.Printf("'Location' called, location: %v\n", in.Location)
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var err error
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var lat, lon float32
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switch in.LocationType {
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case pb.LocationType_LOCATION_TYPE_CITY:
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lat, lon, err = fetchCityCoords(in.Location.GetCity(), s.ApiKey)
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case pb.LocationType_LOCATION_TYPE_ZIP_CODE:
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lat, lon, err = fetchZipCoords(in.Location.GetZipCode(), s.ApiKey)
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default:
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_, err = strconv.Atoi(in.Location.GetZipCode())
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if err != nil {
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lat, lon, err = fetchCityCoords(in.Location.GetCity(), s.ApiKey)
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} else {
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lat, lon, err = fetchZipCoords(in.Location.GetZipCode(), s.ApiKey)
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}
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}
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if err != nil {
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return nil, status.Errorf(
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codes.InvalidArgument,
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fmt.Sprintf("Invalid location or location type: %s, %s\n",
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in.Location.String(),
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in.LocationType.String()),
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)
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}
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return &pb.SendLocation{
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Latitude: lat,
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Longitude: lon,
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}, nil
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}
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// Used internally to fetch precise locations
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// Receives a city and the OpenWeather API key
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// Returns the latitude and longitude for the given location, otherwise an error
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func fetchCityCoords(city string, key string) (float32, float32, error) {
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log.Printf("'fetchCityCoords' called, location: %v\n", city)
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url := "http://api.openweathermap.org/geo/1.0/direct?q="
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token := "&appid=" + key
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url += city + token
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res, err := http.Get(url)
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if err != nil {
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log.Printf("Error fetching location: %v\n", err)
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}
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defer res.Body.Close()
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body, err := ioutil.ReadAll(res.Body)
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if err != nil {
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log.Printf("Error reading location: %v\n", err)
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}
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coords := []Coordinates{}
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err = json.Unmarshal(body, &coords)
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if err != nil {
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log.Printf("Error decoding geolocation JSON: %v\n", err)
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}
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if len(coords) < 1 {
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return 0, 0, status.Error(codes.NotFound, "Location not found")
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}
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return coords[0].Latitude, coords[0].Longitude, nil
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}
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// Used internally to fetch precise locations
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// Receives a zip code and the OpenWeather API key
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// Returns the latitude and longitude for the given location, otherwise an error
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func fetchZipCoords(zip string, key string) (float32, float32, error) {
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log.Printf("'fetchZipCoords' called, zip code: %v\n", zip)
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url := "https://api.openweathermap.org/geo/1.0/zip?zip="
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token := "&appid=" + key
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url += zip + token
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res, err := http.Get(url)
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if err != nil {
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log.Printf("Error fetching location: %v\n", err)
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}
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defer res.Body.Close()
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body, err := ioutil.ReadAll(res.Body)
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if err != nil {
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log.Printf("Error reading location: %v\n", err)
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}
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coords := Coordinates{}
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err = json.Unmarshal(body, &coords)
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if err != nil {
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log.Printf("Error decoding geolocation JSON: %v\n", err)
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}
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if coords.Latitude == 0 && coords.Longitude == 0 {
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return 0, 0, status.Error(codes.NotFound, "Location not found")
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}
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return coords.Latitude, coords.Longitude, nil
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}
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