mexon/friendica
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ok now I'm just making silly mistakes--take out premature function locking code

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This commit is contained in:
Zach Prezkuta 2012-06-23 22:28:28 -06:00
parent 0877c5b687
commit 59ebe6f111
1 changed files with 20 additions and 77 deletions
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69
include/diaspora.php
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@ -5,7 +5,6 @@ require_once('include/items.php');
require_once('include/bb2diaspora.php');
require_once('include/contact_selectors.php');
require_once('include/queue_fn.php');
require_once('include/lock.php');
function diaspora_dispatch_public($msg) {
@ -114,83 +113,27 @@ function diaspora_get_contact_by_handle($uid,$handle) {
}
function find_diaspora_person_by_handle($handle) {
$person = false;
$update = false;
$got_lock = false;
do {
$r = q("select * from fcontact where network = '%s' and addr = '%s' limit 1",
dbesc(NETWORK_DIASPORA),
dbesc($handle)
);
if(count($r)) {
$person = $r[0];
logger('find_diaspora_person_by handle: in cache ' . print_r($r,true), LOGGER_DEBUG);
// update record occasionally so it doesn't get stale
$d = strtotime($person['updated'] . ' +00:00');
if($d < strtotime('now - 14 days'))
$d = strtotime($r[0]['updated'] . ' +00:00');
if($d > strtotime('now - 14 days'))
return $r[0];
$update = true;
}
// FETCHING PERSON INFORMATION FROM REMOTE SERVER
//
// If the person isn't in our 'fcontact' table, or if he/she is but
// his/her information hasn't been updated for more than 14 days, then
// we want to fetch the person's information from the remote server.
//
// Note that $person isn't changed by this block of code unless the
// person's information has been successfully fetched from the remote
// server. So if $person was 'false' to begin with (because he/she wasn't
// in the local cache), it'll stay false, and if $person held the local
// cache information to begin with, it'll keep that information. That way
// if there's a problem with the remote fetch, we can at least use our
// cached information--it's better than nothing.
if((! $person) || ($update)) {
// Lock the function to prevent race conditions if multiple items
// come in at the same time from a person who doesn't exist in
// fcontact
$got_lock = lock_function('find_diaspora_person_by_handle', false);
if($got_lock) {
logger('find_diaspora_person_by_handle: create or refresh', LOGGER_DEBUG);
logger('find_diaspora_person_by_handle: refresh',LOGGER_DEBUG);
require_once('include/Scrape.php');
$r = probe_url($handle, PROBE_DIASPORA);
// Note that Friendica contacts can return a "Diaspora person"
// if Diaspora connectivity is enabled on their server
if((count($r)) && ($r['network'] === NETWORK_DIASPORA)) {
add_fcontact($r,$update);
$person = ($r);
return ($r);
}
unlock_function('find_diaspora_person_by_handle');
}
else {
logger('find_diaspora_person_by_handle: couldn\'t lock function', LOGGER_DEBUG);
if(! $person)
block_on_function_lock('find_diaspora_person_by_handle');
}
}
} while((! $person) && (! $got_lock));
// We need to try again if the person wasn't in 'fcontact' but the function was locked.
// The fact that the function was locked may mean that another process was creating the
// person's record. It could also mean another process was creating or updating an unrelated
// person.
//
// At any rate, we need to keep trying until we've either got the person or had a chance to
// try to fetch his/her remote information. But we don't want to block on locking the
// function, because if the other process is creating the record, then when we acquire the lock
// we'll dive right into creating another, duplicate record. We DO want to at least wait
// until the lock is released, so we don't flood the database with requests.
//
// If the person was in the 'fcontact' table, don't try again. It's not worth the time, since
// we do have some information for the person
return $person;
return false;
}