SourceManagement

A common source is converted into an EDK client here: donkeyClient.ml

  DonkeySources.functions.DonkeySources.function_connect <-
    (fun s_uid ->
      try
        match s_uid with
          Direct_address _ ->
            let c = new_client s_uid in
            reconnect_client c
        | Invalid_address _ -> ()
        | Indirect_address (server_ip, server_port, id, port, real_ip) ->

       if Ip.reachable server_ip then
              query_id server_ip server_port id;

      with e ->
       if !verbose then
         lprintf_nl "connect_source: exception %s" (Printexc2.to_string e)
  );

Why does printing sources in a user interface create clients from sources?
Could this be the reason why so many sources with MD4 = 000000000000 are printed?

  file_ops.op_file_print_sources <- (fun file o ->

    if not (use_html_mods o) then raise Not_found;
    let buf = o.conn_buf in
    let sources_list = ref [] in
    DonkeySources.iter_relevant_sources (fun s ->
      let s_uid = s.DonkeySources.source_uid in
      let c = new_client s_uid in
      sources_list := (s,c) :: !sources_list
    ) file.file_sources;