// decodes an nntp message and writes it to a section of the file.
func decodeMsg(c *nntp.Conn, f *file, groups []string, MsgId string) {
var err error
defer f.Done()
err = findGroup(c, groups)
if err != nil {
putBroken(c)
fmt.Fprintln(os.Stderr, "nntp error:", err)
return
}
rc, err := c.GetMessage(MsgId)
if err != nil {
fmt.Fprintln(os.Stderr, "nntp error getting", MsgId, ":", 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 {
fmt.Fprintln(os.Stderr, err)
return
}
wr := f.WriterAt(yread.Begin)
_, err = io.Copy(wr, yread)
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
}
func findGroup(c *nntp.Conn, groups []string) error {
var err error
for _, g := range groups {
err = c.SwitchGroup(g)
if err == nil {
return nil
}
}
return err
}
func putBroken(c *nntp.Conn) {
c.Close()
connMu.Lock()
connNum--
connMu.Unlock()
}