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main.go
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main.go
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package main
import (
"encoding/xml"
"log"
"net/http"
"net/http/cgi"
"os"
"time"
)
func checkErr(err error) {
if err != nil {
panic(err)
}
}
func main() {
signsLoc := os.Getenv("SIGNMSG_URL")
if signsLoc == "" {
signsLoc = "https://chart.maryland.gov/rss/ProduceRss.aspx?Type=DMSXML"
}
log.Fatalln(cgi.Serve(displaySignData(signsLoc)))
}
func displaySignData(signsLoc string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
r.ParseForm()
// Default to the usual signs
names := []string{"8003", "8001"}
// if we were passed explicit names,
// use those instead
if len(r.Form["name"]) > 0 {
names = r.Form["name"]
}
signs, err := getSigns(signsLoc, names)
if err != nil {
errTemplate().Execute(w, struct{ ErrMessage string }{err.Error()})
return
}
dispSigns := toDisplaySigns(signs)
resultsTemplate().Execute(w, struct{ Signs []displaySign }{dispSigns})
}
}
func getSigns(signsLoc string, names []string) ([]sign, error) {
var ms messageSigns
c := setupClient()
resp, err := c.Get(signsLoc)
if err != nil {
return nil, err
}
defer resp.Body.Close()
err = xml.NewDecoder(resp.Body).Decode(&ms)
if err != nil {
return nil, err
}
return ms.FindByName(names...), nil
}
func setupClient() *http.Client {
return &http.Client{
Timeout: 25 * time.Second,
}
}