mirror of
https://codeberg.org/andyscott/OpenWeather-gRPC-API.git
synced 2024-12-04 09:57:20 -05:00
120 lines
3 KiB
Go
120 lines
3 KiB
Go
package main
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import (
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"context"
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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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// Receives a gRPC request for the current forecast
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// Returns a SendCurrent message containing the forecast in JSON
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func (s *Server) Current(ctx context.Context, in *pb.RequestCurrent) (*pb.SendCurrent, error) {
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log.Printf("'Current' called: %v\n", in)
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token := "&appid=" + s.ApiKey
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url, err := s.createCurrentUrl(in)
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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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fcst, err := fetchForecast(url + token)
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if err != nil {
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return nil, status.Errorf(
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codes.Internal,
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fmt.Sprintf(
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"A server error occurred while fetching the forecast: %v\n",
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err,
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))
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}
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return &pb.SendCurrent{
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Payload: fcst,
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}, nil
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}
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// Assembles the URL for current weather requests to OpenWeather
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func (s *Server) createCurrentUrl(in *pb.RequestCurrent) (string, error) {
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url := "https://api.openweathermap.org/data/2.5/weather?"
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units := updateUnits(in.Units)
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lat, lon, err := s.fetchLocation(in.LocationType, in.Location)
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if err != nil {
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return "", err
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}
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url += fmt.Sprintf("lat=%f", lat) + fmt.Sprintf("&lon=%f", lon) + units
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return url, nil
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}
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// Creates the units portion of the request to OpenWeater
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func updateUnits(units pb.Units) string {
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unitStr := "&units="
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switch units {
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case pb.Units_UNITS_IMPERIAL:
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unitStr += "imperial"
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case pb.Units_UNITS_METRIC:
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unitStr += "metric"
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default:
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unitStr += "standard"
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}
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return unitStr
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}
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// Obtains a locations exact coordinates for the request to OpenWeather
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func (s *Server) fetchLocation(locType pb.LocationType, loc *pb.OneOfLocation) (float32, float32, error) {
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var lat, lon float32
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var err error
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switch locType {
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case pb.LocationType_LOCATION_TYPE_CITY:
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lat, lon, err = fetchCityCoords(loc.GetCity(), s.ApiKey)
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case pb.LocationType_LOCATION_TYPE_ZIP_CODE:
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lat, lon, err = fetchZipCoords(loc.GetZipCode(), s.ApiKey)
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case pb.LocationType_LOCATION_TYPE_COORDS:
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lat = loc.GetCoords().Latitude
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lon = loc.GetCoords().Longitude
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default:
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_, err = strconv.Atoi(loc.GetZipCode())
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if err != nil {
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lat, lon, err = fetchCityCoords(loc.GetCity(), s.ApiKey)
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} else {
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lat, lon, err = fetchZipCoords(loc.GetZipCode(), s.ApiKey)
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}
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}
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if err != nil {
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return 0, 0, err
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}
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return lat, lon, nil
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}
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// Obtains forecasts from OpenWeather
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// Receives the URL as a string
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// Returns the JSON response from OpenWeather
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func fetchForecast(url string) (string, error) {
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res, err := http.Get(url)
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if err != nil {
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log.Printf("Error fetching forecast: %v\n", err)
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return "", 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 response from OpenWeather: %v\n", err)
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return "", err
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}
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return string(body), nil
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}
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