// fetch returns the anchor files and subdirectories rooted at zdir
func fetch(z *zookeeper.Conn, zdir string, children []string) (dirs map[string]struct{}, files map[circuit.WorkerID]*File, err error) {
dirs = make(map[string]struct{})
files = make(map[circuit.WorkerID]*File)
for _, name := range children {
id, err := circuit.ParseWorkerID(name)
if err != nil {
// Node names that are not files are ok.
// We treat them as subdirectories.
dirs[name] = struct{}{}
continue
}
znode := path.Join(zdir, name)
data, _, err := z.Get(znode)
if err != nil {
// If this is a Zookeeper connection error, we should bail out
log.Printf("Problem getting node `%s` from Zookeeper (%s)", znode, err)
continue
}
zfile := &ZFile{}
r := bytes.NewBufferString(data)
if err := gob.NewDecoder(r).Decode(zfile); err != nil {
log.Printf("anchor file cannot be parsed: (%s)", err)
continue
}
if zfile.Addr.WorkerID() != id {
log.Printf("anchor file name vs addr mismatch: %s vs %s\n", id, zfile.Addr.WorkerID())
continue
}
file := &File{owner: zfile.Addr}
files[id] = file
}
return dirs, files, nil
}
