// This loads the codes data to the WeatherCodes struct
func init() {
configYaml, readErr := ioutil.ReadFile("config/codes.yaml")
utils.ErrorPanic(readErr)
yamlErr := yaml.Unmarshal(configYaml, WeatherCodes)
utils.ErrorPanic(yamlErr)
}
func loadTemplate(name string) (*template.Template, error) {
// Load the template specified by the name parameter
fileBytes, readErr := ioutil.ReadFile(fmt.Sprintf("templates/%s.html", name))
utils.ErrorPanic(readErr)
// Create a template object and parse it
return template.New("tmpl").Parse(string(fileBytes))
}
func main() {
flag.Parse()
tmpl, err := loadTemplate("main")
utils.ErrorPanic(err)
// Get the port from the environment variable, or use 8080 if none is found
port := (os.Getenv("PORT"))
if len(port) == 0 {
port = "8080"
}
// Handle all requests to the web root ("/")
// with a Server instance returned by NewServer
http.Handle("/", NewServer(tmpl, *pollPeriod))
// Listen on the specified port on any interface
// This will block until the program is terminated
utils.ErrorPanic(http.ListenAndServe(":"+port, nil))
}
// ServeHTTP implements the HTTP user interface.
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// Create the structure that will be passed to the template
data := struct {
ForecastLongTerm *config.ForecastLongTerm
PollTime string
}{
s.forecastLongTerm,
s.poll_time.Format(time.Kitchen),
}
// Execute the template by applying it to the data structure
err := s.tmpl.Execute(w, data)
utils.ErrorPanic(err)
}
func fetchJson(url string) *config.ForecastLongTerm {
// Do a GET on the passed in URL
res, err := http.Get(url)
utils.ErrorPanic(err)
defer res.Body.Close()
// Create a decoder that reader from res.Body
decoder := json.NewDecoder(res.Body)
// Declare the variable that will hold the JSON data
// Its type is a struct that reflects the JSON format
var data config.ForecastLongTerm
// Read the next JSON-encoded value from its input
// and store it in the data struct
err = decoder.Decode(&data)
return &data
}