main.go
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package main
import (
"encoding/csv"
"fmt"
"github.com/mmcdole/gofeed"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"sort"
"strings"
)
func rootHandler(w http.ResponseWriter, r *http.Request) {
feeds, err := getFeedList(os.Args[1])
if err != nil {
log.Fatal(err)
}
posts := make([]gofeed.Feed, 0)
var gottenFeed gofeed.Feed
for _, f := range feeds {
gottenFeed, err = getFeed(f)
if err != nil {
// break loop in case of
// feed fetching failure
log.Println(err)
continue
}
posts = append(posts, gottenFeed)
}
beegFeed := gofeed.Feed{}
for _, p := range posts {
for _, i := range p.Items {
// Overriding description to the blog title
i.Description = p.Title
beegFeed.Items = append(beegFeed.Items, i)
}
}
sort.Sort(sort.Reverse(beegFeed))
for _, i := range beegFeed.Items {
fmt.Fprintf(w, "<p>%s: <a href=\"%s\">%s</a></p>", i.Description, i.Link, i.Title)
}
}
func getFeed(url string) (post gofeed.Feed, err error) {
fp := gofeed.NewParser()
feed, err := fp.ParseURL(url)
if err != nil {
log.Println(err)
}
return *feed, err
}
func getFeedList(url string) ([]string, error) {
res, err := http.Get(url)
if err != nil {
err = fmt.Errorf("getFeedList http.Get: %w", err)
log.Fatal(err)
}
robots, err := ioutil.ReadAll(res.Body)
if err != nil {
log.Fatal(err)
}
res.Body.Close()
r := csv.NewReader(strings.NewReader(string(robots)))
feeds := make([]string, 0)
for {
record, err := r.Read()
if err == io.EOF {
break
}
if err != nil {
log.Fatal(err)
}
// [0] == url to a feed
feeds = append(feeds, record[0])
}
return feeds, err
}
func main() {
// TODO: check whether ARG1 exists
http.HandleFunc("/", rootHandler)
log.Fatal(http.ListenAndServe(":8080", nil))
}