// DownloadRange downloads log entries from the given starting index till one
// less than upTo. If status is not nil then status updates will be written to
// it until the function is complete, when it will be closed. The log entries
// are provided to an output channel.
func downloadCTRangeToChannel(ctLog *client.LogClient, outEntries chan<- ct.LogEntry,
status chan<- OperationStatus, start, upTo int64) (int64, error) {
if outEntries == nil {
return 0, fmt.Errorf("No output channel provided")
}
defer close(outEntries)
if status != nil {
defer close(status)
}
index := start
for index < upTo {
if status != nil {
status <- OperationStatus{start, index, upTo}
}
max := index + 2000
if max >= upTo {
max = upTo - 1
}
rawEnts, err := ctLog.GetEntries(index, max)
if err != nil {
return index, err
}
for _, ent := range rawEnts {
outEntries <- ent
if (ent.Index) != index {
return index, fmt.Errorf("Index mismatch, local: %v, remote: %v", index, ent.Index)
}
index++
}
}
return index, nil
}
