Creating API

README.md

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+# weather-api
+
+An REST API to check the current weather.
+
+## Build
+```sh
+go build
+```
+## Run
+```sh
+./weather-api
+```
+## Usage
+```sh
+curl http://localhost:3000/weather/{city}
+```
+## Example
+#### Request
+```sh
+curl http://localhost:3000/weather/Curitiba
+```
+#### Response
+```sh
+{"temperature":"17","wind":"4"}
+```

controller/weather.go

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+package controller
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+
+	"github.com/PuerkitoBio/goquery"
+	"github.com/gorilla/mux"
+	"github.com/robertoduessmann/weather-api/model"
+)
+
+func CurrentWeather(w http.ResponseWriter, r *http.Request) {
+
+	var weather model.Weather
+
+	resp := getExternalWeather(getCity(r))
+	defer resp.Body.Close()
+
+	if resp.StatusCode == 200 {
+		parse(resp, &weather)
+	}
+
+	fmt.Fprintf(w, string(toJSON(weather)))
+}
+
+func getCity(r *http.Request) string {
+	return mux.Vars(r)["city"]
+}
+
+func getExternalWeather(city string) *http.Response {
+	resp, err := http.Get("http://wttr.in/" + city)
+	if err != nil {
+		log.Fatal("Cannot open url: ", err)
+	}
+	return resp
+}
+
+func parse(resp *http.Response, weather *model.Weather) {
+	doc, err := goquery.NewDocumentFromReader(resp.Body)
+	if err != nil {
+		log.Fatal(err)
+	}
+	doc.Find("body > pre > span:nth-child(3)").Each(func(i int, s *goquery.Selection) {
+		weather.Temperature = s.Text()
+	})
+	doc.Find("body > pre > span:nth-child(6)").Each(func(i int, s *goquery.Selection) {
+		weather.Wind = s.Text()
+	})
+}
+
+func toJSON(weather model.Weather) []byte {
+	respose, err := json.Marshal(weather)
+	if err != nil {
+		fmt.Println(err)
+	}
+	return respose
+}

main.go

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+package main
+
+import (
+	"log"
+	"net/http"
+
+	"github.com/gorilla/mux"
+	"github.com/robertoduessmann/weather-api/controller"
+)
+
+func main() {
+
+	weather := mux.NewRouter()
+	weather.Path("/weather/{city}").Methods(http.MethodGet).HandlerFunc(controller.CurrentWeather)
+
+	if err := http.ListenAndServe(":3000", weather); err != nil {
+		log.Fatal(err)
+	}
+
+}

model/weather.go

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+package model
+
+type Weather struct {
+	Temperature string `json:"temperature"`
+	Wind        string `json:"wind"`
+}