Rename news -> rss.

modules/rss/rss.go

@@ -0,0 +1,76 @@
+// vim:ts=4:sts=4:sw=4:noet:tw=72
+//
+// This code is mostly derived from the example code by Jim Teeuwen
+// and is subject to the CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
+// license.
+
+package rss
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"time"
+
+	rss "github.com/jteeuwen/go-pkg-rss"
+	"github.com/jteeuwen/go-pkg-xmlx"
+)
+
+var sayCh chan string
+var hideOutput = true
+
+func Init(ch chan string, path string) {
+	log.Printf("Initializing news module")
+	sayCh = ch
+	file, err := os.Open(path)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+	scanner := bufio.NewScanner(file)
+	<-time.After(60 * time.Second)
+	for scanner.Scan() {
+		go PollFeed(scanner.Text(), 5, charsetReader)
+	}
+	if err := scanner.Err(); err != nil {
+		log.Fatal(err)
+	}
+	time.Sleep(60 * time.Second)
+	hideOutput = false
+}
+
+func PollFeed(uri string, timeout int, cr xmlx.CharsetFunc) {
+	feed := rss.New(timeout, true, chanHandler, itemHandler)
+	for {
+		log.Printf("Polling feed: %s", uri)
+		if err := feed.Fetch(uri, cr); err != nil {
+			log.Printf("[e] %s: %s", "*", uri, err)
+			//sayCh <- fmt.Sprintf("%s\n[e] %s: %s", "*", uri, err)
+			return
+		}
+		<-time.After(time.Duration(feed.SecondsTillUpdate() * 1e9))
+	}
+}
+
+func chanHandler(feed *rss.Feed, newchannels []*rss.Channel) {
+	//sayCh <- fmt.Sprintf("%s\n%d new channel(s) in %s", "*", len(newchannels), feed.Url)
+}
+
+func itemHandler(feed *rss.Feed, ch *rss.Channel, newitems []*rss.Item) {
+	if hideOutput {
+		return
+	}
+	for _, ni := range newitems {
+		sayCh <- fmt.Sprintf("%s\n*** [RSS] %v - %v", "*", ni.Title, ni.Links[0].Href)
+	}
+}
+
+func charsetReader(charset string, r io.Reader) (io.Reader, error) {
+	if charset == "ISO-8859-1" || charset == "iso-8859-1" {
+		return r, nil
+	}
+	return nil, errors.New("Unsupported character set encoding: " + charset)
+}