main.go
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package main
import (
"encoding/csv"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"sort"
"strings"
"sync"
"text/template"
"time"
"github.com/SlyMarbo/rss"
)
type FeedItem struct {
FeedTitle string
PostTitle string
Link string
Date time.Time
}
func rootHandler(w http.ResponseWriter, r *http.Request) {
// replace this with hardcoded list from j3s.sh
scrapedFeeds, err := makeFeedList(os.Args[1])
if err != nil {
fmt.Fprintf(w, "makeList error: %s", err)
log.Fatal(err)
}
feeds := make([]rss.Feed, 0)
var feed *rss.Feed
fetchFailures := make([]error, 0)
var wg sync.WaitGroup
var m sync.Mutex
wg.Add(len(scrapedFeeds))
for _, f := range scrapedFeeds {
go func(f string) {
defer wg.Done()
feed, err = getFeed(f)
if err != nil {
// break loop in case of
// feed fetching failure
log.Print(err)
err = fmt.Errorf("%s<br>%s", f, err)
m.Lock()
defer m.Unlock()
fetchFailures = append(fetchFailures, err)
return
}
feeds = append(feeds, *feed)
}(f)
}
wg.Wait()
if len(fetchFailures) > 0 {
for _, f := range fetchFailures {
// put this on the website eventually??
log.Printf("failed to fetch %s", f)
}
}
var feedItems []FeedItem
for _, f := range feeds {
for _, i := range f.Items {
var fi FeedItem
fi.FeedTitle = f.Title
fi.PostTitle = i.Title
fi.Link = i.Link
fi.Date = i.Date
feedItems = append(feedItems, fi)
// fmt.Fprintf(w, "<tr>")
// fmt.Fprintf(w, "<td>%s: <a href=\"%s\">%s</a> <small>%s</small></td>",
// f.Title, i.Link, i.Title, i.Date)
// fmt.Fprintf(w, "</tr>")
}
}
sort.Slice(feedItems, func(i, j int) bool {
return feedItems[i].Date.After(feedItems[j].Date)
})
// here we goooOooOoOoOooOooOo
// ooOooOOoooOOooooOOOOOooooOO
const tpl = `
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>jes's personal feed list</title>
</head>
<body>
<table><tbody>
{{range .}}
<tr>
<td>
{{.FeedTitle}}: <a href="{{.Link}}">{{.PostTitle}}</a> <small>{{.Date}}</small>
</td>
</tr>
{{end}}
</tbody></table>
</body>
</html>`
t, err := template.New("jrss").Parse(tpl)
if err != nil {
log.Fatal(err)
}
err = t.Execute(w, feedItems)
if err != nil {
log.Print(err)
}
}
func getFeed(url string) (*rss.Feed, error) {
feed, err := rss.Fetch(url)
if err != nil {
return nil, err
}
return feed, nil
}
func makeFeedList(url string) ([]string, error) {
res, err := http.Get(url)
if err != nil {
err = fmt.Errorf("makeFeedList http.Get: %w", err)
return nil, err
}
defer res.Body.Close()
body, err := ioutil.ReadAll(res.Body)
if err != nil {
err = fmt.Errorf("makeFeedList failed to read http body: %w", err)
return nil, err
}
r := csv.NewReader(strings.NewReader(string(body)))
feeds := make([]string, 0)
for {
record, err := r.Read()
if err == io.EOF {
break
}
if err != nil {
err = fmt.Errorf("makeFeedList record parsing error: %w\nvalue: %s", err, record)
return nil, err
}
// [0] == url to a feed (item 0 of the csv)
feeds = append(feeds, record[0])
}
return feeds, err
}
func faviconHandler(w http.ResponseWriter, r *http.Request) {
http.NotFound(w, r)
}
func main() {
if len(os.Args) == 1 {
log.Fatal("Supply your feed list as ARG1.\nExample: go run main.go https://j3s.sh/feeds.txt")
}
http.HandleFunc("/favicon.ico", faviconHandler)
http.HandleFunc("/", rootHandler)
log.Fatal(http.ListenAndServe(":8080", nil))
}