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|
package backends
import (
"encoding/json"
"flag"
"fmt"
"github.com/schachmat/wego/iface"
"io/ioutil"
"log"
"net/http"
"regexp"
"strings"
"time"
)
type openWeatherConfig struct {
apiKey string
lang string
debug bool
}
type openWeatherResponse struct {
Cod string `json:"cod"`
City struct {
Name string `json:"name"`
Country string `json:"country"`
} `json:"city"`
List []dataBlock `json:"list"`
}
type dataBlock struct {
Dt int64 `json:"dt"`
Main struct {
TempMin float32 `json:"temp_min"`
TempMax float32 `json:"temp_max"`
Humidity int `json:"humidity"`
} `json:"main"`
Weather []struct {
Description string `json:"description"`
ID int `json:"id"`
} `json:"weather"`
Wind struct {
Speed float32 `json:"speed"`
Deg float32 `json:"deg"`
} `json:"wind"`
Rain struct {
MM3h float32 `json:"3h"`
} `json:"rain"`
}
const (
openweatherURI = "http://api.openweathermap.org/data/2.5/forecast?%s&appid=%s&units=metric&lang=%s"
)
func (c *openWeatherConfig) Setup() {
flag.StringVar(&c.apiKey, "owm-api-key", "", "openweathermap backend: the api `KEY` to use")
flag.StringVar(&c.lang, "owm-lang", "en", "openweathermap backend: the `LANGUAGE` to request from openweathermap")
flag.BoolVar(&c.debug, "owm-debug", false, "openweathermap backend: print raw requests and responses")
}
func (c *openWeatherConfig) fetch(url string) (*openWeatherResponse, error) {
res, err := http.Get(url)
if c.debug {
fmt.Printf("Fetching %s\n", url)
}
if err != nil {
return nil, fmt.Errorf(" Unable to get (%s) %v", url, err)
}
defer res.Body.Close()
body, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, fmt.Errorf("Unable to read response body (%s): %v", url, err)
}
if c.debug {
fmt.Printf("Response (%s):\n%s\n", url, string(body))
}
var resp openWeatherResponse
if err = json.Unmarshal(body, &resp); err != nil {
return nil, fmt.Errorf("Unable to unmarshal response (%s): %v\nThe json body is: %s", url, err, string(body))
}
if resp.Cod != "200" {
return nil, fmt.Errorf("Erroneous response body: %s", string(body))
}
return &resp, nil
}
func (c *openWeatherConfig) parseDaily(dataInfo []dataBlock, numdays int) []iface.Day {
var forecast []iface.Day
var day *iface.Day
for _, data := range dataInfo {
slot, err := c.parseCond(data)
if err != nil {
log.Println("Error parsing hourly weather condition:", err)
continue
}
if day == nil {
day = new(iface.Day)
day.Date = slot.Time
}
if day.Date.Day() == slot.Time.Day() {
day.Slots = append(day.Slots, slot)
}
if day.Date.Day() != slot.Time.Day() {
forecast = append(forecast, *day)
if len(forecast) >= numdays {
break
}
day = new(iface.Day)
day.Date = slot.Time
day.Slots = append(day.Slots, slot)
}
}
return forecast
}
func (c *openWeatherConfig) parseCond(dataInfo dataBlock) (iface.Cond, error) {
var ret iface.Cond
codemap := map[int]iface.WeatherCode{
200: iface.CodeThunderyShowers,
201: iface.CodeThunderyShowers,
210: iface.CodeThunderyShowers,
230: iface.CodeThunderyShowers,
231: iface.CodeThunderyShowers,
202: iface.CodeThunderyHeavyRain,
211: iface.CodeThunderyHeavyRain,
212: iface.CodeThunderyHeavyRain,
221: iface.CodeThunderyHeavyRain,
232: iface.CodeThunderyHeavyRain,
300: iface.CodeLightRain,
301: iface.CodeLightRain,
310: iface.CodeLightRain,
311: iface.CodeLightRain,
313: iface.CodeLightRain,
321: iface.CodeLightRain,
302: iface.CodeHeavyRain,
312: iface.CodeHeavyRain,
314: iface.CodeHeavyRain,
500: iface.CodeLightShowers,
501: iface.CodeLightShowers,
502: iface.CodeHeavyShowers,
503: iface.CodeHeavyShowers,
504: iface.CodeHeavyShowers,
511: iface.CodeLightSleet,
520: iface.CodeLightShowers,
521: iface.CodeLightShowers,
522: iface.CodeHeavyShowers,
531: iface.CodeHeavyShowers,
600: iface.CodeLightSnow,
601: iface.CodeLightSnow,
602: iface.CodeHeavySnow,
611: iface.CodeLightSleet,
612: iface.CodeLightSleetShowers,
615: iface.CodeLightSleet,
616: iface.CodeLightSleet,
620: iface.CodeLightSnowShowers,
621: iface.CodeLightSnowShowers,
622: iface.CodeHeavySnowShowers,
701: iface.CodeFog,
711: iface.CodeFog,
721: iface.CodeFog,
741: iface.CodeFog,
731: iface.CodeUnknown, // sand, dust whirls
751: iface.CodeUnknown, // sand
761: iface.CodeUnknown, // dust
762: iface.CodeUnknown, // volcanic ash
771: iface.CodeUnknown, // squalls
781: iface.CodeUnknown, // tornado
800: iface.CodeSunny,
801: iface.CodePartlyCloudy,
802: iface.CodeCloudy,
803: iface.CodeVeryCloudy,
804: iface.CodeVeryCloudy,
900: iface.CodeUnknown, // tornado
901: iface.CodeUnknown, // tropical storm
902: iface.CodeUnknown, // hurricane
903: iface.CodeUnknown, // cold
904: iface.CodeUnknown, // hot
905: iface.CodeUnknown, // windy
906: iface.CodeUnknown, // hail
951: iface.CodeUnknown, // calm
952: iface.CodeUnknown, // light breeze
953: iface.CodeUnknown, // gentle breeze
954: iface.CodeUnknown, // moderate breeze
955: iface.CodeUnknown, // fresh breeze
956: iface.CodeUnknown, // strong breeze
957: iface.CodeUnknown, // high wind, near gale
958: iface.CodeUnknown, // gale
959: iface.CodeUnknown, // severe gale
960: iface.CodeUnknown, // storm
961: iface.CodeUnknown, // violent storm
962: iface.CodeUnknown, // hurricane
}
ret.Code = iface.CodeUnknown
ret.Desc = dataInfo.Weather[0].Description
ret.Humidity = &(dataInfo.Main.Humidity)
ret.TempC = &(dataInfo.Main.TempMin)
ret.FeelsLikeC = &(dataInfo.Main.TempMax)
if &dataInfo.Wind.Deg != nil {
p := int(dataInfo.Wind.Deg)
ret.WinddirDegree = &p
}
if &(dataInfo.Wind.Speed) != nil && (dataInfo.Wind.Speed) > 0 {
windSpeed := (dataInfo.Wind.Speed * 3.6)
ret.WindspeedKmph = &(windSpeed)
}
if val, ok := codemap[dataInfo.Weather[0].ID]; ok {
ret.Code = val
}
if &dataInfo.Rain.MM3h != nil {
mmh := (dataInfo.Rain.MM3h / 1000) / 3
ret.PrecipM = &mmh
}
ret.Time = time.Unix(dataInfo.Dt, 0)
return ret, nil
}
func (c *openWeatherConfig) Fetch(location string, numdays int
|
