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<?php |
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|
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if (!defined('ABSPATH')) { |
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exit; |
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} |
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|
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/** |
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* Cross-request coordination primitives for the staged view-build pipeline. |
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* |
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* Two responsibilities, both called from the staged-build orchestrator in |
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* ABJ_404_Solution_DataAccess_ViewQueriesStagedTrait: |
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* |
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* 1. Build-writer serialization: acquireViewBuildLock / releaseViewBuildLock |
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* with a wp_options-row advisory-lock fallback for managed/sharded MySQL |
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* hosts (PlanetScale, Vitess, split-routing ProxySQL) where session- |
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* scoped GET_LOCK is unsupported. Includes the diagnostic |
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* verifyBuildLockSerializesWriter() probe. |
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* |
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* 2. Background rebuild scheduling: scheduleViewDoneRebuild() plus the |
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* cron-stuck and schedule-failed deduplicated admin notices. Detects a |
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* stuck WordPress cron from wp_get_ready_cron_jobs() age and surfaces a |
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* notice without sending email or flooding wp-admin. |
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* |
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* Sibling to ABJ_404_Solution_DataAccess_ViewBuildHelpersTrait; both are |
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* mixed into ABJ_404_Solution_DataAccess. Calls localizeOrDefaultViewBuildNotice() |
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* from the helpers trait (resolved via $this-> on the composing class). |
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*/ |
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trait ABJ_404_Solution_DataAccess_ViewBuildLockAndCronTrait { |
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|
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/** |
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* Per-request memo of whether session-scoped GET_LOCK is supported on |
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* this host. null = not yet probed; true = a prior probe returned |
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* got=1; false = a prior probe returned NULL or the function is |
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* unrecognized (managed/sharded MySQL: PlanetScale, Vitess, certain |
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* ProxySQL routings). Once unsupported, we skip the GET_LOCK round |
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* trip and go straight to the option-row fallback for the rest of the |
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* request. |
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* |
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* @var bool|null |
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*/ |
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private static $namedLockSupportedThisRequest = null; |
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|
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/** |
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* Fires the "fallback in use" log line at info level once per request |
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* even when many `acquireViewBuildLock` calls take the fallback path. |
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* Diagnostics only; no correctness impact. |
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* |
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* @var bool |
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*/ |
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private static $fallbackLockLoggedThisRequest = false; |
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|
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/** |
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* Tracks whether the most recent successful acquire used the option-row |
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* fallback (true) or the native GET_LOCK (false), so the matching |
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* `releaseViewBuildLock` releases the correct primitive. |
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* |
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* @var bool |
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*/ |
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private $usingTransientFallbackLock = false; |
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|
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/** @var string Last detected reason for falling back; surfaced in the notice. */ |
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private $lastNamedLockUnsupportedReason = ''; |
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/** @var string Last detected error string from GET_LOCK; surfaced in the notice. */ |
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private $lastNamedLockUnsupportedError = ''; |
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|
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/** |
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* @param int $timeoutSeconds GET_LOCK wait-time. 0 (default) is the |
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* non-blocking acquire used by every steady-state path: if cron or a |
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* sibling tab holds the lock, we yield immediately so the caller can |
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* return locked=true. Use a positive value only for the diagnostic |
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* force-rebuild path, where we want to block until the in-flight |
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* build releases so we can own the next one. |
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* |
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* On managed/sharded MySQL hosts where session-scoped named locks are |
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* unavailable (`GET_LOCK` returns NULL or "function does not exist"), |
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* falls back to a wp_options-row advisory lock acquired with |
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* `add_option` semantics. This serializes concurrent workers on a |
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* single-master WordPress site even when the database layer cannot. |
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* Documented in `ViewBuildLockUnavailabilityTest`. |
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* |
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* @return bool |
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*/ |
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private function acquireViewBuildLock(int $timeoutSeconds = 0): bool { |
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$name = $this->getLowercasePrefix() . ABJ_404_Solution_ViewBuildConfig::VIEW_DONE_BUILD_LOCK_NAME; |
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|
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// Once we've classified the host as "named locks unsupported" in |
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// this request, don't pay the round-trip on every subsequent |
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// acquire. Re-check happens on the next request because the static |
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// is request-scoped. |
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if (self::$namedLockSupportedThisRequest === false) { |
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$this->ensureFallbackLockNoticeAndLog(); |
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return $this->acquireTransientFallbackLock($name); |
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} |
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|
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$timeout = max(0, $timeoutSeconds); |
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$sql = "SELECT GET_LOCK('" . esc_sql($name) . "', " . $timeout . ") AS got"; |
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$result = $this->queryAndGetResults($sql, array('log_errors' => false)); |
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|
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$err = isset($result['last_error']) && is_string($result['last_error']) |
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? trim($result['last_error']) : ''; |
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if ($err !== '' && $this->isNamedLockUnsupportedError($err)) { |
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self::$namedLockSupportedThisRequest = false; |
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$this->lastNamedLockUnsupportedReason = 'function_unsupported'; |
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$this->lastNamedLockUnsupportedError = $err; |
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$this->ensureFallbackLockNoticeAndLog(); |
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return $this->acquireTransientFallbackLock($name); |
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} |
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|
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$rows = is_array($result['rows'] ?? null) ? $result['rows'] : array(); |
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if (!empty($rows) && is_array($rows[0]) && array_key_exists('got', $rows[0])) { |
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$got = $rows[0]['got']; |
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if ($got === null) { |
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// NULL: per the MySQL manual, GET_LOCK returns NULL on an |
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// error. On sharded/managed hosts (PlanetScale, Vitess) it |
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// is also returned as a "no-op" indicator. Either way the |
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// session-scoped lock did not engage; treat as unsupported. |
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self::$namedLockSupportedThisRequest = false; |
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$this->lastNamedLockUnsupportedReason = 'returned_null'; |
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$this->lastNamedLockUnsupportedError = ''; |
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$this->ensureFallbackLockNoticeAndLog(); |
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return $this->acquireTransientFallbackLock($name); |
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} |
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$intGot = is_scalar($got) ? intval($got) : 0; |
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if ($intGot === 1) { |
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if (self::$namedLockSupportedThisRequest === null) { |
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self::$namedLockSupportedThisRequest = true; |
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} |
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$this->usingTransientFallbackLock = false; |
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return true; |
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} |
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// got=0 (or any other integer): another connection holds the |
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// lock. Normal contention; do NOT fall back, the other worker |
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// is already advancing the build. |
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return false; |
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} |
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|
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// No rows and no recognized "unsupported" error string: ambiguous. |
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// Treat as lock unavailable rather than guessing fallback is needed. |
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return false; |
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} |
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|
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/** @return void */ |
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private function releaseViewBuildLock(): void { |
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// @utf8-audit: opt-out - $name is built from $wpdb->prefix + a class |
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// constant; never user input, cannot contain invalid UTF-8 bytes. |
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$name = $this->getLowercasePrefix() . ABJ_404_Solution_ViewBuildConfig::VIEW_DONE_BUILD_LOCK_NAME; |
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if ($this->usingTransientFallbackLock) { |
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$this->usingTransientFallbackLock = false; |
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if (function_exists('delete_option')) { |
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delete_option($this->transientFallbackLockOptionName($name)); |
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} |
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return; |
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} |
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$this->queryAndGetResults("SELECT RELEASE_LOCK('" . esc_sql($name) . "')", |
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array('log_errors' => false)); |
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} |
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|
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/** |
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* Acquire the option-row advisory lock that stands in for GET_LOCK on |
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* hosts where named locks are unavailable. Race-safe: `add_option` |
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* fails when the option already exists, so at most one worker wins |
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* the contended add. Stale locks from a prior crashed worker are |
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* cleared when their stored expiry timestamp has passed. |
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* |
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* @param string $name Already-prefixed lock identifier shared with GET_LOCK. |
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* @return bool |
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*/ |
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private function acquireTransientFallbackLock(string $name): bool { |
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if (!function_exists('add_option') || !function_exists('get_option')) { |
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return false; |
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} |
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$optionName = $this->transientFallbackLockOptionName($name); |
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$now = time(); |
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$ttl = ABJ_404_Solution_ViewBuildConfig::VIEW_BUILD_TRANSIENT_LOCK_TTL_SECONDS; |
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$expiresAt = $now + $ttl; |
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|
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// Stale-lock recovery: if the existing option's expiry has passed, |
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// the prior holder crashed without releasing. Delete and try again. |
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$existing = get_option($optionName, 0); |
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$existingExpires = is_scalar($existing) ? intval($existing) : 0; |
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if ($existingExpires > 0 && $existingExpires <= $now && function_exists('delete_option')) { |
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delete_option($optionName); |
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} |
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|
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// add_option returns false if the option row already exists. This |
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// is the race-safe primitive: even with N parallel PHP workers |
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// racing on the same option, at most one wins. set_transient is |
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// NOT race-safe in this way (it overwrites), so we deliberately |
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// use add_option directly. |
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$added = add_option($optionName, (string)$expiresAt, '', false); |
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if ($added) { |
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$this->usingTransientFallbackLock = true; |
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return true; |
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} |
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return false; |
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} |
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|
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/** @param string $name @return string */ |
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private function transientFallbackLockOptionName(string $name): string { |
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return $name . '_transient_lock'; |
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} |
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|
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/** |
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* Match a `last_error` string against the patterns that indicate the |
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* MySQL host does not support session-scoped named locks. Conservative: |
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* we only return true when the error specifically names GET_LOCK as |
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* unrecognized; any other DB error stays in the "lock unavailable, |
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* try later" bucket. |
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* |
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* @param string $err |
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* @return bool |
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*/ |
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private function isNamedLockUnsupportedError(string $err): bool { |
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$errLow = strtolower($err); |
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if (strpos($errLow, 'get_lock') === false) { |
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return false; |
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} |
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return strpos($errLow, 'does not exist') !== false |
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|| strpos($errLow, 'unknown function') !== false |
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|| strpos($errLow, 'er_sp_does_not_exist') !== false |
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|| strpos($errLow, 'is not allowed') !== false |
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|| strpos($errLow, 'not allowed in this context') !== false; |
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} |
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|
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/** |
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* Surface a deduplicated admin notice for the fallback path and emit |
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* the info-level "fallback in use" log line once per request. |
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* |
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* The notice transient is refreshed on every fallback acquire (cheap |
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* and idempotent) so admins on hosts where named locks come and go |
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* still see an up-to-date "still on fallback" indicator. The log line |
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* is gated on a per-request static so a steady-state host that |
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* acquires the lock dozens of times per request only produces a |
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* single info entry. |
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* |
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* @return void |
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*/ |
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private function ensureFallbackLockNoticeAndLog(): void { |
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if (function_exists('set_transient')) { |
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// allow-cache-empty: notice must exist even when the host returns no named-lock error text. |
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set_transient( |
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'abj404_view_build_get_lock_unsupported_notice', |
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array( |
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'reason' => $this->lastNamedLockUnsupportedReason !== '' |
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? $this->lastNamedLockUnsupportedReason : 'unknown', |
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'error' => substr($this->lastNamedLockUnsupportedError, 0, 500), |
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'when' => time(), |
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'message' => 'This database does not support session-scoped GET_LOCK named locks. ' |
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. 'The plugin is using a WordPress option-row fallback to coordinate the staged view-build. ' |
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. 'Common on PlanetScale, Vitess, and split-routing ProxySQL deployments.', |
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), |
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ABJ_404_Solution_ViewBuildConfig::VIEW_BUILD_DEGRADED_NOTICE_TTL_SECONDS |
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); |
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} |
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if (!self::$fallbackLockLoggedThisRequest) { |
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self::$fallbackLockLoggedThisRequest = true; |
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$message = '[staged] view-build lock: GET_LOCK unsupported on this host ' |
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. '(reason=' . ($this->lastNamedLockUnsupportedReason !== '' |
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? $this->lastNamedLockUnsupportedReason : 'unknown') |
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. '); using option-row fallback.'; |
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if (is_object($this->logger) && method_exists($this->logger, 'infoMessage')) { |
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$this->logger->infoMessage($message); |
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} elseif (is_object($this->logger) && method_exists($this->logger, 'debugMessage')) { |
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$this->logger->debugMessage($message); |
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} |
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} |
| 267 |
} |
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|
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/** |
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* Resets the per-request lock-fallback memos so a fresh request starts |
| 271 |
* by probing GET_LOCK on the host again. Tests use this to drive the |
| 272 |
* per-request lifecycle inside a single PHP process. |
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* |
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* @return void |
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*/ |
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public static function resetViewBuildLockFallbackMemos(): void { |
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self::$namedLockSupportedThisRequest = null; |
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self::$fallbackLockLoggedThisRequest = false; |
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} |
| 280 |
|
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/** |
| 282 |
* Probe whether the build lock primitive on this host actually |
| 283 |
* serializes the writer connection. On split-routing deployments |
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* (ProxySQL/Vitess/MaxScale read-write split, PlanetScale branch |
| 285 |
* replicas), `SELECT GET_LOCK` may be routed to a replica session |
| 286 |
* that holds a session-scoped lock without preventing two writer |
| 287 |
* connections from running concurrent DDL. The classic symptom is |
| 288 |
* two staged-build workers both passing `acquireViewBuildLock` and |
| 289 |
* both attempting the S11 RENAME swap. |
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* |
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* The probe acquires the build lock, writes a unique nonce to |
| 292 |
* wp_options, reads it back through the same code path, and verifies |
| 293 |
* the round trip. A passing probe is consistent with single-master |
| 294 |
* routing; a failing probe is a strong signal the lock did not |
| 295 |
* serialize the writer and the caller should switch to the option-row |
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* fallback. |
| 297 |
* |
| 298 |
* Public so {@see ABJ_404_Solution_DataAccess} exposes it for the |
| 299 |
* lock-coverage test suite and any future health-check page. |
| 300 |
* |
| 301 |
* @return bool true when the probe round-tripped successfully through |
| 302 |
* the held lock; false on any inability to acquire / write / read / |
| 303 |
* verify. |
| 304 |
*/ |
| 305 |
public function verifyBuildLockSerializesWriter(): bool { |
| 306 |
if (!$this->acquireViewBuildLock(0)) { |
| 307 |
return false; |
| 308 |
} |
| 309 |
try { |
| 310 |
if (!function_exists('update_option') || !function_exists('get_option')) { |
| 311 |
return false; |
| 312 |
} |
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$optionName = $this->getLowercasePrefix() . 'abj404_view_build_lock_writer_probe'; |
| 314 |
try { |
| 315 |
$nonce = bin2hex(random_bytes(8)); |
| 316 |
} catch (\Throwable $t) { |
| 317 |
$nonce = (string)mt_rand() . '_' . (string)microtime(true); |
| 318 |
} |
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update_option($optionName, $nonce, false); |
| 320 |
$readBack = get_option($optionName, ''); |
| 321 |
if (function_exists('delete_option')) { |
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delete_option($optionName); |
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} |
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return is_string($readBack) && $readBack === $nonce; |
| 325 |
} finally { |
| 326 |
$this->releaseViewBuildLock(); |
| 327 |
} |
| 328 |
} |
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|
| 330 |
/** |
| 331 |
* Schedule the staged-build cron rebuild hook. Idempotent: the |
| 332 |
* wp_next_scheduled() check short-circuits when an event is already |
| 333 |
* queued. Promoted from `private` to `public` in Phase 4 of the staged |
| 334 |
* view-build watermark refactor: the deleted invalidateViewDone() god |
| 335 |
* method previously exposed schedule-only semantics through its body; |
| 336 |
* the post-refactor seam for "schedule a rebuild with no other side |
| 337 |
* effects" is this method called directly. Production callers reach it |
| 338 |
* via invalidateViewSnapshotCache() (cron / mutation path) and |
| 339 |
* forceRestartViewBuild() (runner-owned force-restart); the public |
| 340 |
* surface lets test code drive the same primitive without resorting to |
| 341 |
* reflection. |
| 342 |
* |
| 343 |
* @return void |
| 344 |
*/ |
| 345 |
public function scheduleViewDoneRebuild(int $delaySeconds = 1): void { |
| 346 |
if (!function_exists('wp_next_scheduled') || !function_exists('wp_schedule_single_event')) { |
| 347 |
return; |
| 348 |
} |
| 349 |
$hook = 'abj404_rebuildViewDone'; |
| 350 |
// Detect a stuck WordPress cron by reading WP's own scheduled-event |
| 351 |
// metadata. When cron is firing normally, wp_reschedule_event() |
| 352 |
// (wp-cron.php:129) advances each recurring event's next_run_time |
| 353 |
// to the future before the handler executes, so wp_get_ready_cron_jobs() |
| 354 |
// returns events whose timestamps are at most a few minutes overdue. |
| 355 |
// When cron stops, those timestamps stay frozen in the past and the |
| 356 |
// earliest one grows older with every passing hour. >= 24h overdue |
| 357 |
// is unambiguously broken; this works whether DISABLE_WP_CRON is set |
| 358 |
// or not, and produces no false positives for sites with working |
| 359 |
// external cron (the great majority of DISABLE_WP_CRON installs). |
| 360 |
$stuckHours = $this->getCronStuckHours(); |
| 361 |
if ($stuckHours >= 24) { |
| 362 |
$this->setViewBuildCronStuckNotice($stuckHours); |
| 363 |
} elseif (function_exists('delete_transient')) { |
| 364 |
// Cron is healthy. Self-heal: clear any stale cron-stuck notice |
| 365 |
// so a previous false-positive (or a recovered failure) does |
| 366 |
// not linger up to 24h waiting for the dedup transient to |
| 367 |
// expire on its own. |
| 368 |
delete_transient('abj404_view_build_stuck_wp_cron_disabled'); |
| 369 |
} |
| 370 |
$next = wp_next_scheduled($hook); |
| 371 |
if ($next !== false) { |
| 372 |
return; |
| 373 |
} |
| 374 |
// Pass wp_error=true so a failed schedule returns a WP_Error we can |
| 375 |
// route into a notice instead of silently dropping. WP cron schedule |
| 376 |
// can fail when the cron lock is held, the cron option is unwritable, |
| 377 |
// or a custom cron implementation rejects the event. |
| 378 |
$scheduled = wp_schedule_single_event( |
| 379 |
time() + max(1, intval($delaySeconds)), |
| 380 |
$hook, |
| 381 |
array(), |
| 382 |
true |
| 383 |
); |
| 384 |
$isError = (function_exists('is_wp_error') && is_wp_error($scheduled)); |
| 385 |
if ($scheduled === false) { |
| 386 |
$this->setViewBuildScheduleFailedNotice(''); |
| 387 |
} elseif ($isError) { |
| 388 |
$errMsg = ''; |
| 389 |
if (is_object($scheduled) && method_exists($scheduled, 'get_error_message')) { |
| 390 |
$msg = $scheduled->get_error_message(); |
| 391 |
$errMsg = is_string($msg) ? $msg : ''; |
| 392 |
} |
| 393 |
$this->setViewBuildScheduleFailedNotice($errMsg); |
| 394 |
} |
| 395 |
} |
| 396 |
|
| 397 |
/** |
| 398 |
* Deduplicated admin notice (24h transient) telling the admin that |
| 399 |
* WordPress cron has stopped advancing. Triggered by isCronStuck() |
| 400 |
* detecting that the earliest overdue cron event is at least 24 hours |
| 401 |
* older than now, which means recurring events are no longer being |
| 402 |
* rescheduled and cron-dependent plugin features are stalled. |
| 403 |
* |
| 404 |
* @param int $hoursStuck how many hours the earliest overdue event has been waiting |
| 405 |
* @return void |
| 406 |
*/ |
| 407 |
private function setViewBuildCronStuckNotice(int $hoursStuck): void { |
| 408 |
if (!function_exists('set_transient')) { |
| 409 |
return; |
| 410 |
} |
| 411 |
$key = 'abj404_view_build_stuck_wp_cron_disabled'; |
| 412 |
if (function_exists('get_transient') && get_transient($key) !== false) { |
| 413 |
return; // dedup window still active |
| 414 |
} |
| 415 |
$template = $this->localizeOrDefaultViewBuildNotice( |
| 416 |
'WordPress cron does not appear to be running. The earliest overdue ' |
| 417 |
. 'cron event has been waiting at least %d hours, so cron-dependent ' |
| 418 |
. 'plugin features (staged view-build, daily cleanup, log updates, ' |
| 419 |
. 'digest emails) are not advancing. To resolve: if DISABLE_WP_CRON ' |
| 420 |
. 'is set in wp-config.php either remove it, or configure a system ' |
| 421 |
. 'cron job that requests wp-cron.php periodically. To force the ' |
| 422 |
. 'redirect view to rebuild right now in your browser (workaround ' |
| 423 |
. 'while cron is broken), open the 404 Solution Redirects page ' |
| 424 |
. 'with ?abj404_force_view_rebuild=1 appended to the URL.' |
| 425 |
); |
| 426 |
$payload = array( |
| 427 |
'type' => 'view_build_stuck_cron_disabled', |
| 428 |
'message' => sprintf($template, $hoursStuck), |
| 429 |
'timestamp' => time(), |
| 430 |
'error_string' => '', |
| 431 |
); |
| 432 |
// allow-cache-empty: intentional notice payload; error_string is empty by definition for cron-disabled state. |
| 433 |
set_transient($key, $payload, 86400); |
| 434 |
} |
| 435 |
|
| 436 |
/** |
| 437 |
* @return int hours since the earliest overdue WordPress cron event, |
| 438 |
* or 0 when cron is healthy / cannot be inspected. |
| 439 |
* |
| 440 |
* Uses WP core bookkeeping rather than a heartbeat option: |
| 441 |
* `wp_reschedule_event()` (wp-cron.php:129) updates each recurring |
| 442 |
* event's next_run_time to a future timestamp before its handler |
| 443 |
* executes. So if cron is running, every recurring event lives in the |
| 444 |
* future and `wp_get_ready_cron_jobs()` returns at most a few-minute |
| 445 |
* window of events that have just become due. If cron stops, those |
| 446 |
* timestamps stay frozen in the past and the earliest one keeps |
| 447 |
* aging. |
| 448 |
*/ |
| 449 |
private function getCronStuckHours(): int { |
| 450 |
if (!function_exists('wp_get_ready_cron_jobs')) { |
| 451 |
return 0; |
| 452 |
} |
| 453 |
$ready = wp_get_ready_cron_jobs(); |
| 454 |
if (!is_array($ready) || empty($ready)) { |
| 455 |
return 0; |
| 456 |
} |
| 457 |
$earliest = 0; |
| 458 |
foreach (array_keys($ready) as $ts) { |
| 459 |
$tsInt = (int) $ts; |
| 460 |
if ($tsInt > 0 && ($earliest === 0 || $tsInt < $earliest)) { |
| 461 |
$earliest = $tsInt; |
| 462 |
} |
| 463 |
} |
| 464 |
if ($earliest <= 0) { |
| 465 |
return 0; |
| 466 |
} |
| 467 |
$delta = time() - $earliest; |
| 468 |
if ($delta <= 0) { |
| 469 |
return 0; |
| 470 |
} |
| 471 |
return (int) floor($delta / 3600); |
| 472 |
} |
| 473 |
|
| 474 |
/** |
| 475 |
* Deduplicated admin notice (24h transient) when wp_schedule_single_event |
| 476 |
* itself returns false / WP_Error -- the cron lock is held, the cron |
| 477 |
* option is unwritable, or a custom cron implementation rejected the |
| 478 |
* event. Distinct from the DISABLE_WP_CRON case: scheduling itself |
| 479 |
* failed, so the build will not advance even with external cron. |
| 480 |
* |
| 481 |
* @param string $detail |
| 482 |
* @return void |
| 483 |
*/ |
| 484 |
private function setViewBuildScheduleFailedNotice(string $detail): void { |
| 485 |
if (!function_exists('set_transient')) { |
| 486 |
return; |
| 487 |
} |
| 488 |
$key = 'abj404_view_build_cron_schedule_failed'; |
| 489 |
if (function_exists('get_transient') && get_transient($key) !== false) { |
| 490 |
return; // dedup window still active |
| 491 |
} |
| 492 |
$message = 'Scheduling the 404 Solution staged view-build cron event failed. ' |
| 493 |
. 'The build will not advance in the background until this clears. ' |
| 494 |
. 'This usually indicates the WordPress cron lock is held, the cron ' |
| 495 |
. 'option is unwritable, or a custom cron implementation rejected ' |
| 496 |
. 'the event. Check your hosting provider and any cron-replacement ' |
| 497 |
. 'plugins. To force the redirect view to rebuild right now in your ' |
| 498 |
. 'browser (workaround while cron scheduling is failing), open the ' |
| 499 |
. '404 Solution Redirects page with ?abj404_force_view_rebuild=1 ' |
| 500 |
. 'appended to the URL.'; |
| 501 |
if ($detail !== '') { |
| 502 |
$message .= ' (' . $detail . ')'; |
| 503 |
} |
| 504 |
$payload = array( |
| 505 |
'type' => 'view_build_schedule_failed', |
| 506 |
'message' => $this->localizeOrDefaultViewBuildNotice($message), |
| 507 |
'timestamp' => time(), |
| 508 |
'error_string' => $detail, |
| 509 |
); |
| 510 |
// allow-cache-empty: schedule-failure notice remains useful even when WP returns no detail string. |
| 511 |
set_transient($key, $payload, 86400); |
| 512 |
} |
| 513 |
} |
| 514 |
|
