54 lines
1.7 KiB
PHP
54 lines
1.7 KiB
PHP
|
<?php
|
||
|
|
/**
|
||
|
|
* Atomically claim the oldest queued Web Designer task and print it as JSON.
|
||
|
|
* Prints an empty JSON object ({}) when the queue is empty. Used by the console
|
||
|
|
* runner's drain loop (agents/console/server.mjs) — the runner has no DB driver,
|
||
|
|
* so it shells out to this.
|
||
|
|
*
|
||
|
|
* php api/cli/tasks-next.php
|
||
|
|
*
|
||
|
|
* The claim is a single conditional UPDATE (status queued -> running) guarded by
|
||
|
|
* task_id, so two concurrent callers can never claim the same row.
|
||
|
|
*/
|
||
|
|
|
||
|
|
require __DIR__ . '/../vendor/autoload.php';
|
||
|
|
require __DIR__ . '/../config.php';
|
||
|
|
|
||
|
|
$pdo = new PDO(
|
||
|
|
sprintf('mysql:host=%s;dbname=%s;charset=utf8mb4', DB_HOST, DB_NAME),
|
||
|
|
DB_USER,
|
||
|
|
DB_PASS,
|
||
|
|
[PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC]
|
||
|
|
);
|
||
|
|
|
||
|
|
// Find + claim in a loop: SELECT the next candidate, then a guarded UPDATE.
|
||
|
|
// If the UPDATE affects 0 rows (someone else took it), try the next candidate.
|
||
|
|
for ($attempt = 0; $attempt < 20; $attempt++) {
|
||
|
|
$row = $pdo->query(
|
||
|
|
"SELECT task_id FROM cja_tasks WHERE status = 'queued'
|
||
|
|
ORDER BY sort_order ASC, task_id ASC LIMIT 1"
|
||
|
|
)->fetch();
|
||
|
|
|
||
|
|
if (!$row) {
|
||
|
|
echo "{}";
|
||
|
|
exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
$id = (int) $row['task_id'];
|
||
|
|
$upd = $pdo->prepare(
|
||
|
|
"UPDATE cja_tasks SET status = 'running', started_at = NOW()
|
||
|
|
WHERE task_id = ? AND status = 'queued'"
|
||
|
|
);
|
||
|
|
$upd->execute([$id]);
|
||
|
|
|
||
|
|
if ($upd->rowCount() === 1) {
|
||
|
|
$task = $pdo->prepare('SELECT task_id, title, target_page, prompt, draft, assets FROM cja_tasks WHERE task_id = ?');
|
||
|
|
$task->execute([$id]);
|
||
|
|
echo json_encode($task->fetch(), JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
|
||
|
|
exit;
|
||
|
|
}
|
||
|
|
// lost the race — loop and grab the next one
|
||
|
|
}
|
||
|
|
|
||
|
|
echo "{}";
|