From c2acab21d44bfaa8e051a42a13b72c056c95b0a3 Mon Sep 17 00:00:00 2001
From: friendica <info@friendica.com>
Date: Mon, 23 Mar 2015 19:56:10 -0700
Subject: improve performance of the zotfeed queries

---
 include/items.php    | 19 +++++++++----------
 include/security.php |  6 ++++--
 include/text.php     | 10 +++++++---
 3 files changed, 20 insertions(+), 15 deletions(-)

(limited to 'include')

diff --git a/include/items.php b/include/items.php
index 8e293d761..32e5dcbe5 100755
--- a/include/items.php
+++ b/include/items.php
@@ -4366,12 +4366,11 @@ function zot_feed($uid,$observer_xchan,$arr) {
 		$sql_extra = item_permissions_sql($uid);
 	}
 
+	$limit = " LIMIT 100 ";
+
 	if($mindate != NULL_DATE) {
 		$sql_extra .= " and ( created > '$mindate' or edited > '$mindate' ) ";
-		$limit = "";
 	}
-	else
-		$limit = " limit 0, 50 ";
 
 	if($message_id) {
 		$sql_extra .= " and mid = '" . dbesc($message_id) . "' ";
@@ -4382,20 +4381,20 @@ function zot_feed($uid,$observer_xchan,$arr) {
 
 	if(is_sys_channel($uid)) {
 		require_once('include/security.php');
-		$r = q("SELECT distinct parent, created from item
+		$r = q("SELECT parent from item
 			WHERE uid != %d
-			and uid in (" . stream_perms_api_uids(PERMS_PUBLIC) . ") AND item_restrict = 0 
-			AND (item_flags &  %d)>0 
-			and item_private = 0 $sql_extra ORDER BY created ASC $limit",
+			AND item_private = 0 AND item_restrict = 0 AND uid in (" . stream_perms_api_uids(PERMS_PUBLIC,10,1) . ") 
+			AND (item_flags &  %d) > 0 
+			$sql_extra GROUP BY parent ORDER BY created ASC $limit",
 			intval($uid),
 			intval(ITEM_WALL)
 		);
 	}
 	else {
-		$r = q("SELECT distinct parent, created from item
+		$r = q("SELECT parent from item
 			WHERE uid = %d AND item_restrict = 0
-			AND (item_flags &  %d)>0 
-			$sql_extra ORDER BY created ASC $limit",
+			AND (item_flags &  %d) > 0 
+			$sql_extra GROUP BY parent ORDER BY created ASC $limit",
 			intval($uid),
 			intval(ITEM_WALL)
 		);
diff --git a/include/security.php b/include/security.php
index e9b41dcf9..c3b0e9763 100644
--- a/include/security.php
+++ b/include/security.php
@@ -396,13 +396,15 @@ function init_groups_visitor($contact_id) {
 // will likely be too expensive. 
 // Returns a string list of comma separated channel_ids suitable for direct inclusion in a SQL query
 
-function stream_perms_api_uids($perms = NULL ) {
+function stream_perms_api_uids($perms = NULL, $limit = 0, $rand = 0 ) {
 	$perms = is_null($perms) ? (PERMS_SITE|PERMS_NETWORK|PERMS_PUBLIC) : $perms;
 
 	$ret = array();
+	$limit_sql = (($limit) ? " LIMIT " . intval($limit) . " " : '');
+	$random_sql = (($rand) ? " ORDER BY " . db_getfunc('RAND') . " " : '');
 	if(local_channel())
 		$ret[] = local_channel();
-	$r = q("select channel_id from channel where channel_r_stream > 0 and (channel_r_stream & %d)>0 and not (channel_pageflags & %d)>0",
+	$r = q("select channel_id from channel where channel_r_stream > 0 and ( channel_r_stream & %d )>0 and ( channel_pageflags & %d ) = 0 $random_sql $limit_sql ",
 		intval($perms),
 		intval(PAGE_ADULT|PAGE_CENSORED|PAGE_SYSTEM|PAGE_REMOVED)
 	);
diff --git a/include/text.php b/include/text.php
index 86da3ee42..a21d8029f 100644
--- a/include/text.php
+++ b/include/text.php
@@ -1855,9 +1855,13 @@ function check_webbie($arr) {
 
 function ids_to_querystr($arr,$idx = 'id') {
 	$t = array();
-	foreach($arr as $x)
-		$t[] = $x[$idx];
-
+	if($arr) {
+		foreach($arr as $x) {
+			if(! in_array($x[$idx],$t)) {
+				$t[] = $x[$idx];
+			}
+		}
+	}
 	return(implode(',', $t));
 }
 
-- 
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