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<?php |
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if ( ! defined( 'ABSPATH' ) ) { |
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exit; // Exit if accessed directly! |
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} |
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|
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if ( ! class_exists( 'WPSC_ACB_Cache' ) ) : |
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|
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final class WPSC_ACB_Cache { |
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|
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/** |
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* Initialize the cache. |
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*/ |
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public static function init() {} |
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|
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/** |
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* Get the cache key for a given session ID and message. |
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* |
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* @param string $session_id The session ID. |
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* @return string The cache key. |
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*/ |
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public static function get_cache_label( $session_id ) { |
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return "wpsc_acb_cache_{$session_id}"; |
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} |
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|
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/** |
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* Retrieve a cached response for a given session ID and message. |
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* |
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* @param string $session_id The session ID. |
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* @return mixed The cached response or false if not found. |
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*/ |
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public static function get_acb_cache( $session_id ) { |
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|
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$identity = self::get_logged_in_identity(); |
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$default_data = array( |
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'transcript' => array(), |
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'user' => array( |
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'name' => $identity['name'], |
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'email' => $identity['email'], |
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), |
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// Memoized "known user" system-prompt block for this session - |
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// see get_known_user_context()/set_known_user_context() below. |
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// null means "not computed yet this session"; '' is a valid |
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// cached result (e.g. an anonymous guest with nothing to say). |
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'known_user_context' => null, |
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); |
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|
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// Ensure cache payload always has a consistent shape. array_merge() |
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// (rather than a straight overwrite) so a transient written by an |
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// older version of this class - before 'known_user_context' existed - |
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// still gets that key filled in instead of missing entirely. |
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$cache_label = self::get_cache_label( $session_id ); |
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$cached_data = get_transient( $cache_label ); |
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$cache_hit = is_array( $cached_data ); |
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|
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$cached_data = $cache_hit ? array_merge( $default_data, $cached_data ) : $default_data; |
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|
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$previous_user = $cached_data['user']; |
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|
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// Refresh identity in case a guest has since logged in during the conversation. |
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$cached_data['user'] = $default_data['user']; |
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|
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// Only persist when something actually changed (fresh cache needing its |
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// defaults saved, or the identity refresh above found a real change) - |
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// this is called on every read (including from inside a per-message loop |
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// while rebuilding the transcript from the database), so writing the |
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// transient unconditionally here would turn every plain read into a write. |
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if ( ! $cache_hit || $previous_user !== $cached_data['user'] ) { |
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set_transient( $cache_label, $cached_data, HOUR_IN_SECONDS ); |
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} |
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|
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return $cached_data; |
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} |
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|
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/** |
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* Set a cached response for a given session ID and message. |
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* |
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* @param string $session_id The session ID. |
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* @param string $sender The role of the message (user or assistant). |
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* @param string $message The message to cache. |
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*/ |
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public static function set_acb_chat_messages( $session_id, $sender, $message ) { |
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|
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$session_id = (int) $session_id; |
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if ( $session_id <= 0 ) { |
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return; |
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} |
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|
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$sender = is_string( $sender ) ? sanitize_key( $sender ) : ''; |
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if ( ! in_array( $sender, array( 'user', 'assistant' ), true ) ) { |
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return; |
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} |
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|
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$message = is_string( $message ) ? $message : ''; |
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if ( '' === $message ) { |
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return; |
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} |
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|
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$cache_label = self::get_cache_label( $session_id ); |
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$cached_data = self::get_acb_cache( $session_id ); |
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|
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$cached_data['transcript'][] = array( |
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'role' => $sender, |
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'content' => $message, |
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'date_created' => ( new DateTime() )->format( 'Y-m-d H:i:s' ), |
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); |
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set_transient( $cache_label, $cached_data, HOUR_IN_SECONDS ); |
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} |
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|
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/** |
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* Replace the full cached transcript for a session in a single write. |
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* |
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* Used when rebuilding the transcript from the database after a cache |
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* miss - looping N messages through set_acb_chat_messages() there would |
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* cost 2 set_transient() writes per message (one from its internal |
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* get_acb_cache() call, one of its own) instead of the single write here. |
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* |
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* @param int $session_id Session ID. |
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* @param array $transcript Ordered list of ['role' => ..., 'content' => ..., 'date_created' => ...] entries. |
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* @return void |
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*/ |
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public static function set_acb_transcript( $session_id, array $transcript ) { |
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|
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$session_id = (int) $session_id; |
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if ( $session_id <= 0 ) { |
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return; |
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} |
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|
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$cache_label = self::get_cache_label( $session_id ); |
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$cached_data = self::get_acb_cache( $session_id ); |
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$cached_data['transcript'] = $transcript; |
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set_transient( $cache_label, $cached_data, HOUR_IN_SECONDS ); |
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} |
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|
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/** |
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* Get this session's memoized "known user" system-prompt block (see |
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* WPSC_ACB_Chats::get_known_user_context()), so it only has to be built |
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* once per chat session instead of on every single message - relevant |
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* once that block grows beyond a cheap in-memory identity read to |
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* include lookups elsewhere (e.g. WooCommerce order history, LMS |
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* course/progress data) that would otherwise re-run on every turn. |
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* |
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* Lives inside the same per-session transient as the transcript cache, |
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* so it is automatically destroyed together with it - whenever |
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* clear_acb_cache() runs (conversation resolved/skipped/escalation |
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* cancelled) or after an hour of inactivity, whichever comes first - |
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* rather than needing its own separate lifecycle to manage. |
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* |
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* @param int $session_id Session ID. |
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* @return string|null The cached block, or null if nothing has been cached yet this session. |
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*/ |
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public static function get_known_user_context( $session_id ) { |
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|
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$cached_data = self::get_acb_cache( $session_id ); |
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$context = is_string( $cached_data['known_user_context'] ?? null ) ? $cached_data['known_user_context'] : null; |
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|
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return $context; |
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} |
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|
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/** |
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* Store this session's "known user" system-prompt block for reuse by |
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* later messages in the same session. See get_known_user_context(). |
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* |
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* @param int $session_id Session ID. |
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* @param string $context The rendered system-prompt block (may be '' for an anonymous guest). |
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* @return void |
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*/ |
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public static function set_known_user_context( $session_id, $context ) { |
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|
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$session_id = (int) $session_id; |
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if ( $session_id <= 0 ) { |
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return; |
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} |
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|
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$cache_label = self::get_cache_label( $session_id ); |
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$cached_data = self::get_acb_cache( $session_id ); |
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$cached_data['known_user_context'] = is_string( $context ) ? $context : ''; |
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set_transient( $cache_label, $cached_data, HOUR_IN_SECONDS ); |
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} |
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|
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/** |
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* Clear the cached response for a given session ID. |
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* |
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* @param string $session_id The session ID. |
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*/ |
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public static function clear_acb_cache( $session_id ) { |
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|
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$cache_label = self::get_cache_label( $session_id ); |
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|
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delete_transient( $cache_label ); |
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} |
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|
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/** |
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* Resolve logged-in identity for chatbot ticket creation. |
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* |
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* Must use the same "known customer" condition as |
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* WPSC_ACB_Chats::get_known_user_context() (is_customer + customer |
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* record on WPSC_Current_User::$current_user) rather than a raw |
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* WP_User/wp_get_current_user() check, so this cached identity can |
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* never disagree with what the model was told about the visitor. |
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* |
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* @return array |
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*/ |
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private static function get_logged_in_identity() { |
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|
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$unknown_identity = array( |
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'is_logged_in' => false, |
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'name' => 'unknown', |
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'email' => '[email protected]', |
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); |
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|
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$current_user = WPSC_Current_User::$current_user; |
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|
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// Note: WPSC_Customer exposes 'id' via a magic __get() with no |
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// __isset(), and empty( $current_user->customer->id ) always |
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// evaluates true regardless of the actual value in that case - |
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// verified directly (empty() on a magic-getter-only property |
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// short-circuits before ever calling __get()). Read the value |
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// out first via a plain property access and test that instead. |
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$customer_id = empty( $current_user ) || empty( $current_user->is_customer ) || empty( $current_user->customer ) ? '' : $current_user->customer->id; |
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if ( ! $customer_id ) { |
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return $unknown_identity; |
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} |
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|
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$name = sanitize_text_field( (string) $current_user->customer->name ); |
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$email = sanitize_email( (string) $current_user->customer->email ); |
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|
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if ( '' === $name || ! is_email( $email ) ) { |
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return $unknown_identity; |
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} |
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|
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return array( |
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'is_logged_in' => true, |
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'name' => $name, |
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'email' => $email, |
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); |
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} |
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} |
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endif; |
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WPSC_ACB_Cache::init(); |
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|
