LitNL

LitNL/cmd/litnl/litnl.go

@@ -0,0 +1,123 @@
+package main
+
+import (
+	e "codeberg.org/pebbe/errors"
+
+	"encoding/xml"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+type Rss struct {
+	XMLName xml.Name `xml:"rss"`
+	Items   []ItemT  `xml:"channel>item"`
+}
+
+type ItemT struct {
+	PubDate  string `xml:"pubDate"`
+	UnixTime int64  `xml:"unixTime"`
+	Guid     string `xml:"guid"`
+	Link     string `xml:"link"`
+	Data     []byte `xml:",innerxml"`
+}
+
+var (
+	p     = e.PanicErr
+	agent = "AhrefsBot/7.0"
+)
+
+func exists(filename string) bool {
+	_, err := os.Stat(filename)
+	return err == nil
+}
+
+func main() {
+	defer func() {
+		if e.Panicked {
+			_ = recover()
+			os.Exit(1)
+		}
+	}()
+
+	myLock := "/net/corpora/nlnieuws/LitNL/lock"
+	mkLock(myLock)
+	defer func() {
+		_ = os.Remove(myLock)
+	}()
+
+	req, err := http.NewRequest("GET", "https://www.literairnederland.nl/feed/", nil)
+	p(err)
+	req.Header.Set("User-Agent", agent)
+
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	p(err)
+	body, err := io.ReadAll(resp.Body)
+	p(err)
+	p(resp.Body.Close())
+
+	var rss Rss
+	p(xml.Unmarshal(body, &rss))
+
+	if len(rss.Items) == 0 {
+		p(fmt.Errorf("len(rss.Items) == 0"))
+	}
+
+	for _, item := range rss.Items {
+		t, err := time.Parse(time.RFC1123Z, item.PubDate)
+		if err != nil {
+			t, err = time.Parse(time.RFC1123, item.PubDate)
+		}
+		p(err)
+		year, week := t.ISOWeek()
+		dirname := fmt.Sprintf("/net/corpora/nlnieuws/LitNL/%d/%02d", year, week)
+		if exists(dirname + "/lock") {
+			continue
+		}
+		basename := strings.TrimPrefix(item.Guid, "https://www.literairnederland.nl/?p=")
+		filename := dirname + "/" + url.PathEscape(basename)
+
+		p(os.MkdirAll(dirname, 0777))
+		func() {
+			var ok bool
+			defer func() {
+				if e.Panicked {
+					fmt.Fprintln(os.Stderr, "----", filename)
+					fmt.Fprintln(os.Stderr, "----", item.Link)
+				}
+				if !ok {
+					_ = os.Remove(filename + ".xml")
+				}
+			}()
+			fp, err := os.Create(filename + ".xml")
+			p(err)
+			p(fp.WriteString("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<item>\n"))
+			p(fmt.Fprintf(fp, "<unixTime>%d</unixTime>", t.Unix()))
+			p(fp.Write(item.Data))
+			p(fp.WriteString("</item>\n"))
+			p(fp.Close())
+			p(os.Chtimes(filename+".xml", t, t))
+			ok = true
+		}()
+	}
+
+}
+
+func mkLock(filename string) {
+	pid := os.Getpid()
+	link := fmt.Sprintf("%s.%d", filepath.Base(filename), pid)
+	p(os.Symlink(link, filename))
+
+	name, err := os.Readlink(filename)
+	p(err)
+
+	if name != link {
+		p(fmt.Errorf("wrong lock name %q, should be %q", name, link))
+	}
+}