From 2a9bfae2b7341ebe4d420c627867160c7e1427d9 Mon Sep 17 00:00:00 2001
From: Friendika <info@friendika.com>
Date: Fri, 4 Feb 2011 04:25:53 -0800
Subject: prevent runaway notifications when parent=0 due to race condition

---
 include/items.php    | 14 ++++++++------
 include/notifier.php | 43 ++++++++++++++++++++++++++++---------------
 2 files changed, 36 insertions(+), 21 deletions(-)

(limited to 'include')

diff --git a/include/items.php b/include/items.php
index 45d8b62c0..0c9d4cfc2 100644
--- a/include/items.php
+++ b/include/items.php
@@ -688,11 +688,12 @@ function item_store($arr,$force_parent = false) {
 				$arr['parent-uri'] = $r[0]['parent-uri'];
 			}
 
-			$parent_id = $r[0]['id'];
-			$allow_cid = $r[0]['allow_cid'];
-			$allow_gid = $r[0]['allow_gid'];
-			$deny_cid  = $r[0]['deny_cid'];
-			$deny_gid  = $r[0]['deny_gid'];
+			$parent_id      = $r[0]['id'];
+			$parent_deleted = $r[0]['deleted'];
+			$allow_cid      = $r[0]['allow_cid'];
+			$allow_gid      = $r[0]['allow_gid'];
+			$deny_cid       = $r[0]['deny_cid'];
+			$deny_gid       = $r[0]['deny_gid'];
 		}
 		else {
 
@@ -750,13 +751,14 @@ function item_store($arr,$force_parent = false) {
 	// Set parent id - and also make sure to inherit the parent's ACL's.
 
 	$r = q("UPDATE `item` SET `parent` = %d, `allow_cid` = '%s', `allow_gid` = '%s',
-		`deny_cid` = '%s', `deny_gid` = '%s', `private` = %d WHERE `id` = %d LIMIT 1",
+		`deny_cid` = '%s', `deny_gid` = '%s', `private` = %d, `deleted` = $d WHERE `id` = %d LIMIT 1",
 		intval($parent_id),
 		dbesc($allow_cid),
 		dbesc($allow_gid),
 		dbesc($deny_cid),
 		dbesc($deny_gid),
 		intval($private),
+		intval($parent_deleted),
 		intval($current_post)
 	);
 
diff --git a/include/notifier.php b/include/notifier.php
index 8442349cf..a71da853d 100644
--- a/include/notifier.php
+++ b/include/notifier.php
@@ -2,18 +2,18 @@
 require_once("boot.php");
 
 function notifier_run($argv, $argc){
-  global $a, $db;
+	global $a, $db;
 
-  if(is_null($a)){
-    $a = new App;
-  }
+	if(is_null($a)){
+		$a = new App;
+	}
   
-  if(is_null($db)){
-    @include(".htconfig.php");
-    require_once("dba.php");
-    $db = new dba($db_host, $db_user, $db_pass, $db_data);
-    unset($db_host, $db_user, $db_pass, $db_data);
-  };
+	if(is_null($db)) {
+		@include(".htconfig.php");
+		require_once("dba.php");
+		$db = new dba($db_host, $db_user, $db_pass, $db_data);
+		        unset($db_host, $db_user, $db_pass, $db_data);
+	}
 
 	require_once("session.php");
 	require_once("datetime.php");
@@ -62,11 +62,12 @@ function notifier_run($argv, $argc){
 		$r = q("SELECT `parent`, `uid`, `edited` FROM `item` WHERE `id` = %d LIMIT 1",
 			intval($item_id)
 		);
-		if(! count($r)){
+
+		if((! count($r)) || (! intval($r[0]['parent']))) {
 			return;
 		}
-  
-		$parent_id = $r[0]['parent'];
+
+		$parent_id = intval($r[0]['parent']);
 		$uid = $r[0]['uid'];
 		$updated = $r[0]['edited'];
 
@@ -77,6 +78,13 @@ function notifier_run($argv, $argc){
 		if(! count($items)){
 			return;
 		}
+
+		// avoid race condition with deleting entries
+
+		if($items[0]['deleted']) {
+			foreach($items as $item)
+				$item['deleted'] = 1;
+
 	}
 
 	$r = q("SELECT `contact`.*, `user`.`nickname`, `user`.`sprvkey`, `user`.`spubkey`, `user`.`page-flags` 
@@ -122,8 +130,8 @@ function notifier_run($argv, $argc){
 
 			$allow_people = expand_acl($parent['allow_cid']);
 			$allow_groups = expand_groups(expand_acl($parent['allow_gid']));
-			$deny_people = expand_acl($parent['deny_cid']);
-			$deny_groups = expand_groups(expand_acl($parent['deny_gid']));
+			$deny_people  = expand_acl($parent['deny_cid']);
+			$deny_groups  = expand_groups(expand_acl($parent['deny_gid']));
 
 			$conversants = array();
 
@@ -220,6 +228,8 @@ function notifier_run($argv, $argc){
 	else {
 		if($followup) {
 			foreach($items as $item) {  // there is only one item
+				if(! $item['parent'])
+					continue;
 				if($item['id'] == $item_id) {
 					logger('notifier: followup: item: ' . print_r($item,true), LOGGER_DATA);
 					$slap  = atom_entry($item,'html',$owner,$owner,false);
@@ -229,6 +239,9 @@ function notifier_run($argv, $argc){
 		}
 		else {
 			foreach($items as $item) {
+				if(! $item['parent'])
+					continue;
+
 				$contact = get_item_contact($item,$contacts);
 				if(! $contact)
 					continue;
-- 
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