441 lines
12 KiB
PHP
441 lines
12 KiB
PHP
<?php
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/**
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* Pull this URL to our pulling queue.
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* @param string $url
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* @return void
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*/
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function sync_pull($url)
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{
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global $a;
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//If we support it that is.
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if($a->config['syncing']['enable_pulling']){
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q("INSERT INTO `sync-pull-queue` (`url`) VALUES ('%s')", dbesc($url));
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}
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}
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/**
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* Push this URL to our pushing queue as well as mark it as modified using sync_mark.
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* @param string $url
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* @return void
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*/
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function sync_push($url)
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{
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global $a;
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//If we support it that is.
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if($a->config['syncing']['enable_pushing']){
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q("INSERT INTO `sync-push-queue` (`url`) VALUES ('%s')", dbesc($url));
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}
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sync_mark($url);
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}
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/**
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* Mark a URL as modified in some way or form.
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* This will cause anyone that pulls our changes to see this profile listed.
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* @param string $url
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* @return void
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*/
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function sync_mark($url)
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{
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global $a;
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//If we support it that is.
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if(!$a->config['syncing']['enable_pulling']){
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return;
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}
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$exists = count(q("SELECT * FROM `sync-timestamps` WHERE `url`='%s'", dbesc($url)));
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if(!$exists)
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q("INSERT INTO `sync-timestamps` (`url`, `modified`) VALUES ('%s', NOW())", dbesc($url));
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else
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q("UPDATE `sync-timestamps` SET `modified`=NOW() WHERE `url`='%s'", dbesc($url));
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}
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/**
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* For a single fork during the push jobs.
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* Takes a lower priority and pushes a batch of items.
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* @param string $target A sync-target database row.
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* @param array $batch The batch of items to submit.
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* @return void
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*/
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function push_worker($target, $batch)
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{
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//Lets be nice, we're only doing a background job here...
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pcntl_setpriority(5);
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//Find our target's submit URL.
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$submit = $target['base_url'].'/submit';
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foreach($batch as $item){
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set_time_limit(30); //This should work for 1 submit.
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msg("Submitting {$item['url']} to $submit");
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fetch_url($submit.'?url='.bin2hex($item['url']));
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}
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}
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/**
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* Gets an array of push targets.
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* @return array Push targets.
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*/
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function get_push_targets(){
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return q("SELECT * FROM `sync-targets` WHERE `push`=b'1'");
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}
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/**
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* Gets a batch of URL's to push.
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* @param object $a The App instance.
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* @return array Batch of URL's.
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*/
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function get_push_batch($a){
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return q("SELECT * FROM `sync-push-queue` LIMIT %u", intval($a->config['syncing']['max_push_items']));
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}
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/**
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* Gets the push targets as well as a batch of URL's for a pushing job.
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* @param object $a The App instance.
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* @return list($targets, $batch) A list of both the targets array and batch array.
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*/
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function get_pushing_job($a)
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{
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//When pushing is requested...
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if(!!$a->config['syncing']['enable_pushing']){
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//Find our targets.
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$targets = get_push_targets();
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//No targets?
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if(!count($targets)){
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msg('Pushing enabled, but no push targets.');
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$batch = array();
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}
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//If we have targets, get our batch.
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else{
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$batch = get_push_batch($a);
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if(!count($batch)) msg('Empty pushing queue.'); //No batch, means no work.
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}
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}
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//No pushing if it's disabled.
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else{
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$targets = array();
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$batch = array();
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}
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return array($targets, $batch);
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}
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/**
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* Runs a pushing job, creating a thread for each target.
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* @param array $targets Pushing targets.
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* @param array $batch Batch of URL's to push.
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* @param string $db_host DB host to connect to.
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* @param string $db_user DB user to connect with.
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* @param string $db_pass DB pass to connect with.
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* @param mixed $db_data Nobody knows.
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* @param mixed $install Maybe a boolean.
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* @return void
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*/
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function run_pushing_job($targets, $batch, $db_host, $db_user, $db_pass, $db_data, $install)
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{
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//Create a thread for each target we want to serve push messages to.
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//Not good creating more, because it would stress their server too much.
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$threadc = count($targets);
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$threads = array();
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//Do we only have 1 target? No need for threads.
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if($threadc === 1){
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msg('No threads needed. Only one pushing target.');
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push_worker($targets[0], $batch);
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}
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//When we need threads.
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elseif($threadc > 1){
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//POSIX threads only.
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if(!function_exists('pcntl_fork')){
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msg('Error: no pcntl_fork support. Are you running a different OS? Report an issue please.', true);
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}
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//Debug...
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$items = count($batch);
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msg("Creating $threadc push threads for $items items.");
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//Loop while we need more threads.
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for($i = 0; $i < $threadc; $i++){
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$pid = pcntl_fork();
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if($pid === -1) msg('Error: something went wrong with the fork. '.pcntl_strerror(), true);
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//You're a child, go do some labor!
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if($pid === 0){push_worker($targets[$i], $batch); exit;}
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//Store the list of PID's.
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if($pid > 0) $threads[] = $pid;
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}
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}
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//Wait for all child processes.
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$theading_problems = false;
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foreach($threads as $pid){
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pcntl_waitpid($pid, $status);
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if($status !== 0){
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$theading_problems = true;
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msg("Bad process return value $pid:$status");
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}
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}
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//If we did not have any "threading" problems.
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if(!$theading_problems){
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//Reconnect
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global $db;
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$db = new dba($db_host, $db_user, $db_pass, $db_data, $install);
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//Create a query for deleting this queue.
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$where = array();
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foreach($batch as $item) $where[] = dbesc($item['url']);
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$where = "WHERE `url` IN ('".implode("', '", $where)."')";
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//Remove the items from queue.
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q("DELETE FROM `sync-push-queue` $where LIMIT %u", count($batch));
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msg('Removed items from push queue.');
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}
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}
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/**
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* Gets a batch of URL's to push.
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* @param object $a The App instance.
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* @return array Batch of URL's.
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*/
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function get_queued_pull_batch($a){
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//Randomize this, to prevent scraping the same servers too much or dead URL's.
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$batch = q("SELECT * FROM `sync-pull-queue` ORDER BY RAND() LIMIT %u", intval($a->config['syncing']['max_pull_items']));
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msg(sprintf('Pulling %u items from queue.', count($batch)));
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return $batch;
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}
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/**
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* Gets an array of pull targets.
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* @return array Pull targets.
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*/
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function get_pull_targets(){
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return q("SELECT * FROM `sync-targets` WHERE `pull`=b'1'");
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}
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/**
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* Gets a batch of URL's to push.
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* @param object $a The App instance.
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* @return array Batch of URL's.
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*/
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function get_remote_pull_batch($a)
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{
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//Find our targets.
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$targets = get_pull_targets();
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msg(sprintf('Pulling from %u remote targets.', count($targets)));
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//No targets, means no batch.
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if(!count($targets))
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return array();
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//Pull a list of URL's from each target.
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$urls = array();
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foreach($targets as $i => $target){
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//First pull, or an update?
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if(!$target['dt_last_pull'])
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$url = $target['base_url'].'/sync/pull/all';
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else
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$url = $target['base_url'].'/sync/pull/since/'.intval($target['dt_last_pull']);
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//Go for it :D
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$targets[$i]['pull_data'] = json_decode(fetch_url($url), true);
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//If we didn't get any JSON.
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if(!$targets[$i]['pull_data']){
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msg(sprintf('Failed to pull from "%s".', $url));
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continue;
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}
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//Add all entries as keys, to remove duplicates.
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foreach($targets[$i]['pull_data']['results'] as $url)
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$urls[$url]=true;
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}
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//Now that we have our URL's. Store them in the queue.
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foreach($urls as $url=>$bool){
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if($url) sync_pull($url);
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}
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//Since this all worked out, mark each source with the timestamp of pulling.
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foreach($targets as $target){
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if($target['pull_data'] && $target['pull_data']['now']){
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msg('New pull timestamp '.$target['pull_data']['now'].' for '.$target['base_url']);
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q("UPDATE `sync-targets` SET `dt_last_pull`=%u WHERE `base_url`='%s'", $target['pull_data']['now'], dbesc($target['base_url']));
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}
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}
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//Finally, return a batch of this.
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return get_queued_pull_batch($a);
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}
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/**
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* Gathers an array of URL's to scrape from the pulling targets.
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* @param object $a The App instance.
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* @return array URL's to scrape.
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*/
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function get_pulling_job($a)
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{
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//No pulling today...
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if(!$a->config['syncing']['enable_pulling'])
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return array();
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//Firstly, finish the items from our queue.
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$batch = get_queued_pull_batch($a);
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if(count($batch)) return $batch;
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//If that is empty, fill the queue with remote items and return a batch of that.
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$batch = get_remote_pull_batch($a);
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if(count($batch)) return $batch;
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}
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/**
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* For a single fork during the pull jobs.
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* Takes a lower priority and pulls a batch of items.
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* @param int $i The index number of this worker (for round-robin).
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* @param int $threadc The amount of workers (for round-robin).
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* @param array $pull_batch A batch of URL's to pull.
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* @param string $db_host DB host to connect to.
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* @param string $db_user DB user to connect with.
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* @param string $db_pass DB pass to connect with.
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* @param mixed $db_data Nobody knows.
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* @param mixed $install Maybe a boolean.
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* @return void
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*/
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function pull_worker($i, $threadc, $pull_batch, $db_host, $db_user, $db_pass, $db_data, $install)
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{
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//Lets be nice, we're only doing maintenance here...
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pcntl_setpriority(5);
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//Get personal DBA's.
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global $db;
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$db = new dba($db_host, $db_user, $db_pass, $db_data, $install);
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//Get our (round-robin) workload from the batch.
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$workload = array();
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while(isset($pull_batch[$i])){
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$entry = $pull_batch[$i];
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$workload[] = $entry;
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$i+=$threadc;
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}
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//While we've got work to do.
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while(count($workload)){
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$entry = array_pop($workload);
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set_time_limit(20); //This should work for 1 submit.
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msg("Submitting ".$entry['url']);
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run_submit($entry['url']);
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}
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}
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/**
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* Runs a pulling job, creating several threads to do so.
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* @param object $a The App instance.
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* @param array $pull_batch A batch of URL's to pull.
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* @param string $db_host DB host to connect to.
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* @param string $db_user DB user to connect with.
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* @param string $db_pass DB pass to connect with.
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* @param mixed $db_data Nobody knows.
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* @param mixed $install Maybe a boolean.
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* @return void
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*/
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function run_pulling_job($a, $pull_batch, $db_host, $db_user, $db_pass, $db_data, $install)
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{
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//We need the scraper.
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require_once('include/submit.php');
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//POSIX threads only.
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if(!function_exists('pcntl_fork')){
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msg('Error: no pcntl_fork support. Are you running a different OS? Report an issue please.', true);
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}
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//Create the threads we need.
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$items = count($pull_batch);
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$threadc = min($a->config['syncing']['pulling_threads'], $items); //Don't need more threads than items.
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$threads = array();
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msg("Creating $threadc pulling threads for $items profiles.");
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//Build the threads.
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for($i = 0; $i < $threadc; $i++){
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$pid = pcntl_fork();
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if($pid === -1) msg('Error: something went wrong with the fork. '.pcntl_strerror(), true);
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//You're a child, go do some labor!
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if($pid === 0){pull_worker($i, $threadc, $pull_batch, $db_host, $db_user, $db_pass, $db_data, $install); exit;}
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//Store the list of PID's.
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if($pid > 0) $threads[] = $pid;
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}
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//Wait for all child processes.
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$theading_problems = false;
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foreach($threads as $pid){
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pcntl_waitpid($pid, $status);
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if($status !== 0){
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$theading_problems = true;
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msg("Bad process return value $pid:$status");
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}
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}
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//If we did not have any "threading" problems.
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if(!$theading_problems){
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//Reconnect
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global $db;
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$db = new dba($db_host, $db_user, $db_pass, $db_data, $install);
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//Create a query for deleting this queue.
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$where = array();
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foreach($pull_batch as $item) $where[] = dbesc($item['url']);
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$where = "WHERE `url` IN ('".implode("', '", $where)."')";
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//Remove the items from queue.
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q("DELETE FROM `sync-pull-queue` $where LIMIT %u", count($pull_batch));
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msg('Removed items from pull queue.');
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}
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}
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