Optimize header fetching of multi-folder searches with natural (UID) sorting

Thomas Bruederli

2014-04-08 188304872066eef4b20c305f9cd6ea939dd419e0

 program/lib/Roundcube/rcube_imap.php

@@ -955,35 +955,52 @@
            $sort_field = $this->sort_field;
            $search_set = $this->search_set;

            $this->sort_field = null;
            $this->page_size = 1000;  // fetch up to 1000 matching messages per folder
            $this->threading = false;

            $a_msg_headers = array();
            foreach ($search_set->sets as $resultset) {
                if (!$resultset->is_empty()) {
                    $this->search_set = $resultset;
                    $this->search_threads = $resultset instanceof rcube_result_thread;
                    $a_msg_headers = array_merge($a_msg_headers, $this->list_search_messages($resultset->get_parameters('MAILBOX'), 1));
                }
            }

            // do sorting and paging
            // prepare paging
            $cnt   = $search_set->count();
            $from  = ($page-1) * $page_size;
            $to    = $from + $page_size;
            $slice_length = min($page_size, $cnt - $from);

            // sort headers
            if (!$this->threading && !empty($a_msg_headers)) {
                $a_msg_headers = $this->conn->sortHeaders($a_msg_headers, $sort_field, $this->sort_order);
            // fetch resultset headers, sort and slice them
            if (!empty($sort_field)) {
                $this->sort_field = null;
                $this->page_size = 1000;  // fetch up to 1000 matching messages per folder
                $this->threading = false;

                $a_msg_headers = array();
                foreach ($search_set->sets as $resultset) {
                    if (!$resultset->is_empty()) {
                        $this->search_set = $resultset;
                        $this->search_threads = $resultset instanceof rcube_result_thread;
                        $a_msg_headers = array_merge($a_msg_headers, $this->list_search_messages($resultset->get_parameters('MAILBOX'), 1));
                    }
                }

                // sort headers
                if (!empty($a_msg_headers)) {
                    $a_msg_headers = $this->conn->sortHeaders($a_msg_headers, $sort_field, $this->sort_order);
                }

                // store (sorted) message index
                $search_set->set_message_index($a_msg_headers, $sort_field, $this->sort_order);

                // only return the requested part of the set
                $a_msg_headers = array_slice(array_values($a_msg_headers), $from, $slice_length);
            }
            else {
                // slice resultset first...
                $fetch = array();
                foreach (array_slice($search_set->get(), $from, $slice_length) as $msg_id) {
                    list($uid, $folder) = explode('-', $msg_id, 2);
                    $fetch[$folder][] = $uid;
                }

            // store (sorted) message index
            $search_set->set_message_index($a_msg_headers, $sort_field, $this->sort_order);

            // only return the requested part of the set
            $slice_length  = min($page_size, $cnt - $from);
            $a_msg_headers = array_slice(array_values($a_msg_headers), $from, $slice_length);
                // ... and fetch the requested set of headers
                $a_msg_headers = array();
                foreach ($fetch as $folder => $a_index) {
                    $a_msg_headers = array_merge($a_msg_headers, array_values($this->fetch_headers($folder, $a_index)));
                }
            }

            if ($slice) {
                $a_msg_headers = array_slice($a_msg_headers, -$slice, $slice);