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Merge pull request #2879 from annando/1610-performance-too 

Avoiding deadlocks and small sql improvements
This commit is contained in:
Tobias Diekershoff 2016-10-31 21:22:17 +01:00 committed by GitHub
parent a65479ccfd 2e59eec35d
commit 7823223a05
5 changed files with 148 additions and 102 deletions
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2
include/dbstructure.php
View File

@ -918,7 +918,7 @@ function db_definition($charset) {
"ownerid_created" => array("owner-id","created"),
"wall_body" => array("wall","body(6)"),
"uid_visible_moderated_created" => array("uid","visible","moderated","created"),
"uid_uri" => array("uid","uri"),
"uid_uri" => array("uid", "uri"),
"uid_wall_created" => array("uid","wall","created"),
"resource-id" => array("resource-id"),
"uid_type" => array("uid","type"),

124
include/items.php
View File

@ -730,6 +730,7 @@ function item_store($arr,$force_parent = false, $notify = false, $dontcache = fa
if ($arr["uid"] == 0) {
$arr["global"] = true;
// Set the global flag on all items if this was a global item entry
q("UPDATE `item` SET `global` = 1 WHERE `uri` = '%s'", dbesc($arr["uri"]));
} else {
$isglobal = q("SELECT `global` FROM `item` WHERE `uid` = 0 AND `uri` = '%s'", dbesc($arr["uri"]));
@ -763,6 +764,17 @@ function item_store($arr,$force_parent = false, $notify = false, $dontcache = fa
return 0;
}
// Check for already added items.
// There is a timing issue here that sometimes creates double postings.
// An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
if ($arr["uid"] == 0) {
$r = qu("SELECT `id` FROM `item` WHERE `uri` = '%s' AND `uid` = 0 LIMIT 1", dbesc(trim($arr['uri'])));
if (dbm::is_result($r)) {
logger('Global item already stored. URI: '.$arr['uri'].' on network '.$arr['network'], LOGGER_DEBUG);
return 0;
}
}
// Store the unescaped version
$unescaped = $arr;
@ -777,41 +789,67 @@ function item_store($arr,$force_parent = false, $notify = false, $dontcache = fa
. implode("`, `", array_keys($arr))
. "`) VALUES ('"
. implode("', '", array_values($arr))
. "')" );
. "')");
// And restore it
$arr = $unescaped;
// find the item that we just created
$r = q("SELECT `id` FROM `item` WHERE `uri` = '%s' AND `uid` = %d AND `network` = '%s' ORDER BY `id` ASC",
// When the item was successfully stored we fetch the ID of the item.
if (dbm::is_result($r)) {
$r = q("SELECT LAST_INSERT_ID() AS `item-id`");
if (dbm::is_result($r)) {
$current_post = $r[0]['item-id'];
} else {
// This shouldn't happen
$current_post = 0;
}
} else {
// This can happen - for example - if there are locking timeouts.
logger("Item wasn't stored - we quit here.");
q("COMMIT");
return 0;
}
if ($current_post == 0) {
// This is one of these error messages that never should occur.
logger("couldn't find created item - we better quit now.");
q("COMMIT");
return 0;
}
// How much entries have we created?
// We wouldn't need this query when we could use an unique index - but MySQL has length problems with them.
$r = q("SELECT COUNT(*) AS `entries` FROM `item` WHERE `uri` = '%s' AND `uid` = %d AND `network` = '%s'",
dbesc($arr['uri']),
intval($arr['uid']),
dbesc($arr['network'])
);
if (count($r) > 1) {
// There are duplicates. Keep the oldest one, delete the others
logger('item_store: duplicated post occurred. Removing newer duplicates. uri = '.$arr['uri'].' uid = '.$arr['uid']);
q("DELETE FROM `item` WHERE `uri` = '%s' AND `uid` = %d AND `network` = '%s' AND `id` > %d",
dbesc($arr['uri']),
intval($arr['uid']),
dbesc($arr['network']),
intval($r[0]["id"])
);
q("COMMIT");
return 0;
} elseif (count($r)) {
$current_post = $r[0]['id'];
logger('item_store: created item ' . $current_post);
item_set_last_item($arr);
} else {
logger('item_store: could not locate created item');
if (!dbm::is_result($r)) {
// This shouldn't happen, since COUNT always works when the database connection is there.
logger("We couldn't count the stored entries. Very strange ...");
q("COMMIT");
return 0;
}
if ($r[0]["entries"] > 1) {
// There are duplicates. We delete our just created entry.
logger('Duplicated post occurred. uri = '.$arr['uri'].' uid = '.$arr['uid']);
// Yes, we could do a rollback here - but we are having many users with MyISAM.
q("DELETE FROM `item` WHERE `id` = %d", intval($current_post));
q("COMMIT");
return 0;
} elseif ($r[0]["entries"] == 0) {
// This really should never happen since we quit earlier if there were problems.
logger("Something is terribly wrong. We haven't found our created entry.");
q("COMMIT");
return 0;
}
logger('item_store: created item '.$current_post);
item_set_last_item($arr);
if (!$parent_id || ($arr['parent-uri'] === $arr['uri']))
$parent_id = $current_post;
@ -855,19 +893,6 @@ function item_store($arr,$force_parent = false, $notify = false, $dontcache = fa
);
}
/**
* If this is now the last-child, force all _other_ children of this parent to *not* be last-child
*/
if ($arr['last-child']) {
$r = q("UPDATE `item` SET `last-child` = 0 WHERE `parent-uri` = '%s' AND `uid` = %d AND `id` != %d",
dbesc($arr['uri']),
intval($arr['uid']),
intval($current_post)
);
}
$deleted = tag_deliver($arr['uid'],$current_post);
// current post can be deleted if is for a community page and no mention are
@ -884,20 +909,33 @@ function item_store($arr,$force_parent = false, $notify = false, $dontcache = fa
logger('item_store: new item not found in DB, id ' . $current_post);
}
if ($arr['parent-uri'] === $arr['uri']) {
add_thread($current_post);
} else {
update_thread($parent_id);
}
q("COMMIT");
// Due to deadlock issues with the "term" table we are doing these steps after the commit.
// This is not perfect - but a workable solution until we found the reason for the problem.
create_tags_from_item($current_post);
create_files_from_item($current_post);
// Only check for notifications on start posts
if ($arr['parent-uri'] === $arr['uri']) {
add_thread($current_post);
q("COMMIT");
// If this is now the last-child, force all _other_ children of this parent to *not* be last-child
// It is done after the transaction to avoid dead locks.
if ($arr['last-child']) {
$r = q("UPDATE `item` SET `last-child` = 0 WHERE `parent-uri` = '%s' AND `uid` = %d AND `id` != %d",
dbesc($arr['uri']),
intval($arr['uid']),
intval($current_post)
);
}
if ($arr['parent-uri'] === $arr['uri']) {
add_shadow_thread($current_post);
} else {
update_thread($parent_id);
q("COMMIT");
add_shadow_entry($arr);
add_shadow_entry($current_post);
}
check_item_notification($current_post, $uid);

8
include/notifier.php
View File

@ -599,10 +599,10 @@ function notifier_run(&$argv, &$argc){
foreach($r as $rr) {
if((! $mail) && (! $fsuggest) && (! $followup)) {
q("insert into deliverq ( `cmd`,`item`,`contact` ) values ('%s', %d, %d )",
dbesc($cmd),
intval($item_id),
intval($rr['id'])
q("INSERT INTO `deliverq` (`cmd`,`item`,`contact`) VALUES ('%s', %d, %d)
ON DUPLICATE KEY UPDATE `cmd` = '%s', `item` = %d, `contact` = %d",
dbesc($cmd), intval($item_id), intval($rr['id']),
dbesc($cmd), intval($item_id), intval($rr['id'])
);
}
}

31
include/threads.php
View File

@ -23,7 +23,7 @@ function add_thread($itemid, $onlyshadow = false) {
}
/**
* @brief Add a shadow entry for a given item id
* @brief Add a shadow entry for a given item id that is a thread starter
*
* We store every public item entry additionally with the user id "0".
* This is used for the community page and for the search.
@ -97,7 +97,15 @@ function add_shadow_thread($itemid) {
unset($item[0]['id']);
$item[0]['uid'] = 0;
$item[0]['origin'] = 0;
$item[0]['wall'] = 0;
$item[0]['contact-id'] = get_contact($item[0]['author-link'], 0);
if (in_array($item[0]['type'], array("net-comment", "wall-comment"))) {
$item[0]['type'] = 'remote-comment';
} elseif ($item[0]['type'] == 'wall') {
$item[0]['type'] = 'remote';
}
$public_shadow = item_store($item[0], false, false, true);
logger("Stored public shadow for thread ".$itemid." under id ".$public_shadow, LOGGER_DEBUG);
@ -105,7 +113,17 @@ function add_shadow_thread($itemid) {
}
}
function add_shadow_entry($item) {
/**
* @brief Add a shadow entry for a given item id that is a comment
*
* This function does the same like the function above - but for comments
*
* @param integer $itemid Item ID that should be added
*/
function add_shadow_entry($itemid) {
$items = q("SELECT * FROM `item` WHERE `id` = %d", intval($itemid));
$item = $items[0];
// Is this a shadow entry?
if ($item['uid'] == 0)
@ -127,7 +145,16 @@ function add_shadow_entry($item) {
unset($item['id']);
$item['uid'] = 0;
$item['origin'] = 0;
$item['wall'] = 0;
$item['contact-id'] = get_contact($item['author-link'], 0);
if (in_array($item['type'], array("net-comment", "wall-comment"))) {
$item['type'] = 'remote-comment';
} elseif ($item['type'] == 'wall') {
$item['type'] = 'remote';
}
$public_shadow = item_store($item, false, false, true);
logger("Stored public shadow for comment ".$item['uri']." under id ".$public_shadow, LOGGER_DEBUG);

85
mod/item.php
View File

@ -115,7 +115,7 @@ function item_post(&$a) {
if(($r === false) || (! count($r))) {
notice( t('Unable to locate original post.') . EOL);
if(x($_REQUEST,'return'))
goaway($a->get_baseurl() . "/" . $return_path );
goaway($return_path);
killme();
}
$parent_item = $r[0];
@ -197,7 +197,7 @@ function item_post(&$a) {
if((x($_REQUEST,'commenter')) && ((! $parent) || (! $parent_item['wall']))) {
notice( t('Permission denied.') . EOL) ;
if(x($_REQUEST,'return'))
goaway($a->get_baseurl() . "/" . $return_path );
goaway($return_path);
killme();
}
@ -209,7 +209,7 @@ function item_post(&$a) {
if((! can_write_wall($a,$profile_uid)) && (! $allow_moderated)) {
notice( t('Permission denied.') . EOL) ;
if(x($_REQUEST,'return'))
goaway($a->get_baseurl() . "/" . $return_path );
goaway($return_path);
killme();
}
@ -339,7 +339,7 @@ function item_post(&$a) {
killme();
info( t('Empty post discarded.') . EOL );
if(x($_REQUEST,'return'))
goaway($a->get_baseurl() . "/" . $return_path );
goaway($return_path);
killme();
}
}
@ -756,7 +756,7 @@ function item_post(&$a) {
if(x($datarray,'cancel')) {
logger('mod_item: post cancelled by plugin.');
if($return_path) {
goaway($a->get_baseurl() . "/" . $return_path);
goaway($return_path);
}
$json = array('cancel' => 1);
@ -795,7 +795,7 @@ function item_post(&$a) {
proc_run(PRIORITY_HIGH, "include/notifier.php", 'edit_post', $post_id);
if((x($_REQUEST,'return')) && strlen($return_path)) {
logger('return: ' . $return_path);
goaway($a->get_baseurl() . "/" . $return_path );
goaway($return_path);
}
killme();
} else
@ -877,17 +877,26 @@ function item_post(&$a) {
intval($datarray['visible'])
);
$r = q("SELECT `id` FROM `item` WHERE `uri` = '%s' LIMIT 1",
dbesc($datarray['uri']));
if(!count($r)) {
if (dbm::is_result($r)) {
$r = q("SELECT LAST_INSERT_ID() AS `item-id`");
if (dbm::is_result($r)) {
$post_id = $r[0]['item-id'];
} else {
$post_id = 0;
}
} else {
logger('mod_item: unable to create post.');
$post_id = 0;
}
if ($post_id == 0) {
q("COMMIT");
logger('mod_item: unable to retrieve post that was just stored.');
notice( t('System error. Post not saved.') . EOL);
goaway($a->get_baseurl() . "/" . $return_path );
notice(t('System error. Post not saved.') . EOL);
goaway($return_path);
// NOTREACHED
}
$post_id = $r[0]['id'];
logger('mod_item: saved item ' . $post_id);
$datarray["id"] = $post_id;
@ -1000,50 +1009,22 @@ function item_post(&$a) {
}
}
if ($post_id == $parent) {
add_thread($post_id);
} else {
update_thread($parent, true);
}
q("COMMIT");
create_tags_from_item($post_id);
create_files_from_item($post_id);
if ($post_id == $parent) {
add_thread($post_id);
q("COMMIT");
// Insert an item entry for UID=0 for global entries
if ($post_id != $parent) {
add_shadow_thread($post_id);
} else {
update_thread($parent, true);
q("COMMIT");
// Insert an item entry for UID=0 for global entries
// We have to remove or change some data before that,
// so that the post appear like a regular received post.
// Additionally there is some data that isn't a database field.
$arr = $datarray;
$arr['app'] = $arr['source'];
unset($arr['source']);
unset($arr['self']);
unset($arr['wall']);
unset($arr['origin']);
unset($arr['api_source']);
unset($arr['message_id']);
unset($arr['profile_uid']);
unset($arr['post_id']);
unset($arr['dropitems']);
unset($arr['commenter']);
unset($arr['return']);
unset($arr['preview']);
unset($arr['post_id_random']);
unset($arr['emailcc']);
unset($arr['pubmail_enable']);
unset($arr['category']);
unset($arr['jsreload']);
if (in_array($arr['type'], array("net-comment", "wall-comment"))) {
$arr['type'] = 'remote-comment';
} elseif ($arr['type'] == 'wall') {
$arr['type'] = 'remote';
}
add_shadow_entry($arr);
add_shadow_entry($post_id);
}
// This is a real juggling act on shared hosting services which kill your processes
@ -1070,7 +1051,7 @@ function item_post_return($baseurl, $api_source, $return_path) {
return;
if($return_path) {
goaway($baseurl . "/" . $return_path);
goaway($return_path);
}
$json = array('success' => 1);