Merge pull request #61 from charl/master

Added an example of using a custom charset reader to work around specific charset issues

testdata/example.go

@@ -11,24 +11,32 @@ Build & run with:
 */
 
 import (
+	"errors"
 	"fmt"
-	rss "github.com/jteeuwen/go-pkg-rss"
+	"io"
 	"os"
 	"time"
+
+	rss "github.com/jteeuwen/go-pkg-rss"
+	"github.com/jteeuwen/go-pkg-xmlx"
 )
 
 func main() {
 	// This sets up a new feed and polls it for new channels/items.
-	// Invoke it with 'go PollFeed(...)' to have the polling performed in a
-	// separate goroutine, so you can continue with the rest of your program.
-	PollFeed("http://blog.case.edu/news/feed.atom", 5)
+	// Invoking it with 'go PollFeed(...)' to have the polling performed in a
+	// separate goroutine, so we can poll mutiple feeds.
+	go PollFeed("http://blog.case.edu/news/feed.atom", 5, nil)
+
+	// Poll with a custom charset reader. This is to avoid the following error:
+	// ... xml: encoding "ISO-8859-1" declared but Decoder.CharsetReader is nil.
+	PollFeed("https://status.rackspace.com/index/rss", 5, charsetReader)
 }
 
-func PollFeed(uri string, timeout int) {
+func PollFeed(uri string, timeout int, cr xmlx.CharsetFunc) {
 	feed := rss.New(timeout, true, chanHandler, itemHandler)
 
 	for {
-		if err := feed.Fetch(uri, nil); err != nil {
+		if err := feed.Fetch(uri, cr); err != nil {
 			fmt.Fprintf(os.Stderr, "[e] %s: %s", uri, err)
 			return
 		}
@@ -44,3 +52,10 @@ func chanHandler(feed *rss.Feed, newchannels []*rss.Channel) {
 func itemHandler(feed *rss.Feed, ch *rss.Channel, newitems []*rss.Item) {
 	fmt.Printf("%d new item(s) in %s\n", len(newitems), feed.Url)
 }
+
+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)
+}