speedtest-go/web/helpers.go

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package web
import (
"crypto/rand"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"strconv"
"strings"
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log "github.com/sirupsen/logrus"
"github.com/umahmood/haversine"
"github.com/librespeed/speedtest/config"
"github.com/librespeed/speedtest/results"
)
var (
serverCoord haversine.Coord
)
func getRandomData(length int) []byte {
data := make([]byte, length)
if _, err := rand.Read(data); err != nil {
log.Fatalf("Failed to generate random data: %s", err)
}
return data
}
func getIPInfoURL(address string) string {
apiKey := config.LoadedConfig().IPInfoAPIKey
ipInfoURL := `https://ipinfo.io/%s/json`
if address != "" {
ipInfoURL = fmt.Sprintf(ipInfoURL, address)
} else {
ipInfoURL = "https://ipinfo.io/json"
}
if apiKey != "" {
ipInfoURL += "?token=" + apiKey
}
return ipInfoURL
}
func getIPInfo(addr string) results.IPInfoResponse {
var ret results.IPInfoResponse
resp, err := http.DefaultClient.Get(getIPInfoURL(addr))
if err != nil {
log.Errorf("Error getting response from ipinfo.io: %s", err)
return ret
}
raw, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Errorf("Error reading response from ipinfo.io: %s", err)
return ret
}
defer resp.Body.Close()
if err := json.Unmarshal(raw, &ret); err != nil {
log.Errorf("Error parsing response from ipinfo.io: %s", err)
}
return ret
}
func SetServerLocation(conf *config.Config) {
if conf.ServerLat > 0 && conf.ServerLng > 0 {
log.Infof("Configured server coordinates: %.6f, %.6f", conf.ServerLat, conf.ServerLng)
serverCoord.Lat = conf.ServerLat
serverCoord.Lon = conf.ServerLng
return
}
var ret results.IPInfoResponse
resp, err := http.DefaultClient.Get(getIPInfoURL(""))
if err != nil {
log.Errorf("Error getting repsonse from ipinfo.io: %s", err)
return
}
raw, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Errorf("Error reading response from ipinfo.io: %s", err)
return
}
defer resp.Body.Close()
if err := json.Unmarshal(raw, &ret); err != nil {
log.Errorf("Error parsing response from ipinfo.io: %s", err)
return
}
if ret.Location != "" {
serverCoord, err = parseLocationString(ret.Location)
if err != nil {
log.Errorf("Cannot get server coordinates: %s", err)
return
}
}
log.Infof("Fetched server coordinates: %.6f, %.6f", serverCoord.Lat, serverCoord.Lon)
}
func parseLocationString(location string) (haversine.Coord, error) {
var coord haversine.Coord
parts := strings.Split(location, ",")
if len(parts) != 2 {
err := fmt.Errorf("unknown location format: %s", location)
log.Error(err)
return coord, err
}
lat, err := strconv.ParseFloat(parts[0], 64)
if err != nil {
log.Errorf("Error parsing latitude: %s", parts[0])
return coord, err
}
lng, err := strconv.ParseFloat(parts[1], 64)
if err != nil {
log.Errorf("Error parsing longitude: %s", parts[0])
return coord, err
}
coord.Lat = lat
coord.Lon = lng
return coord, nil
}
func calculateDistance(clientLocation string, unit string) string {
clientCoord, err := parseLocationString(clientLocation)
if err != nil {
log.Errorf("Error parsing client coordinates: %s", err)
return ""
}
dist, km := haversine.Distance(clientCoord, serverCoord)
unitString := " mi"
switch unit {
case "km":
dist = km
unitString = " km"
case "NM":
dist = km * 0.539957
unitString = " NM"
}
return fmt.Sprintf("%.2f%s", dist, unitString)
}