// decodes an nntp message and writes it to a section of the file.
func decodeMsg(c *nntp.Conn, f *file, groups []string, MsgID string) {
defer f.Done()
g, err := findGroup(c, groups)
if err != nil {
putBroken(c)
glog.Errorf("switching to group %s: %s", g, err)
return
}
rc, err := c.GetMessage(MsgID)
if err != nil {
glog.Errorf("getting message %s from group %s: %s", MsgID, g, err)
if _, ok := err.(*textproto.Error); ok {
putConn(c)
} else {
putBroken(c)
}
return
}
putConn(c)
yread, err := yenc.NewPart(bytes.NewReader(rc))
if err != nil {
glog.Errorln(err)
return
}
wr := f.WriterAt(yread.Begin)
_, err = io.Copy(wr, yread)
if err != nil {
glog.Errorln(err)
}
}
func putBroken(c *nntp.Conn) {
glog.Infof("%s Broken connection", c.ID)
c.Close()
connMu.Lock()
connNum--
connMu.Unlock()
}
func findGroup(c *nntp.Conn, groups []string) (string, error) {
var err error
for _, g := range groups {
err = c.SwitchGroup(g)
if err == nil {
return g, nil
}
}
return "", err
}
// check an nntp message exists.
func checkMsg(c *nntp.Conn, groups []string, MsgID string) {
defer filewg.Done()
g, err := findGroup(c, groups)
if err != nil {
putBroken(c)
glog.Errorf("switching to group %s: %s", g, err)
return
}
_, err = c.StatMessage(MsgID)
if err != nil {
glog.Errorf("getting message %s from group %s: %s", MsgID, g, err)
if _, ok := err.(*textproto.Error); ok {
putConn(c)
} else {
putBroken(c)
}
return
}
glog.Infof("%s has id %s", g, MsgID)
putConn(c)
}