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| 1 | <?php |
| 2 | /** |
| 3 | * Sync server. |
| 4 | * |
| 5 | * @package automattic/jetpack-sync |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\Sync; |
| 9 | |
| 10 | use WP_Error; |
| 11 | |
| 12 | /** |
| 13 | * Simple version of a Jetpack Sync Server - just receives arrays of events and |
| 14 | * issues them locally with the 'jetpack_sync_remote_action' action. |
| 15 | */ |
| 16 | class Server { |
| 17 | /** |
| 18 | * Codec used to decode sync events. |
| 19 | * |
| 20 | * @access private |
| 21 | * |
| 22 | * @var \Automattic\Jetpack\Sync\Codec_Interface |
| 23 | */ |
| 24 | private $codec; |
| 25 | |
| 26 | /** |
| 27 | * Maximum time for processing sync actions. |
| 28 | * |
| 29 | * @access public |
| 30 | * |
| 31 | * @var int |
| 32 | */ |
| 33 | const MAX_TIME_PER_REQUEST_IN_SECONDS = 15; |
| 34 | |
| 35 | /** |
| 36 | * Prefix of the blog lock transient. |
| 37 | * |
| 38 | * @access public |
| 39 | * |
| 40 | * @var string |
| 41 | */ |
| 42 | const BLOG_LOCK_TRANSIENT_PREFIX = 'jp_sync_req_lock_'; |
| 43 | |
| 44 | /** |
| 45 | * Lifetime of the blog lock transient. |
| 46 | * |
| 47 | * @access public |
| 48 | * |
| 49 | * @var int |
| 50 | */ |
| 51 | const BLOG_LOCK_TRANSIENT_EXPIRY = 60; // Seconds. |
| 52 | |
| 53 | /** |
| 54 | * Constructor. |
| 55 | * |
| 56 | * This is necessary because you can't use "new" when you declare instance properties >:( |
| 57 | * |
| 58 | * @access public |
| 59 | */ |
| 60 | public function __construct() { |
| 61 | $this->codec = new JSON_Deflate_Array_Codec(); |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Set the codec instance. |
| 66 | * |
| 67 | * @access public |
| 68 | * |
| 69 | * @param Automattic\Jetpack\Sync\Codec_Interface $codec Codec instance. |
| 70 | */ |
| 71 | public function set_codec( Codec_Interface $codec ) { |
| 72 | $this->codec = $codec; |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Attempt to lock the request when the server receives concurrent requests from the same blog. |
| 77 | * |
| 78 | * @access public |
| 79 | * |
| 80 | * @param int $blog_id ID of the blog. |
| 81 | * @param int $expiry Blog lock transient lifetime. |
| 82 | * @return boolean True if succeeded, false otherwise. |
| 83 | */ |
| 84 | public function attempt_request_lock( $blog_id, $expiry = self::BLOG_LOCK_TRANSIENT_EXPIRY ) { |
| 85 | $transient_name = $this->get_concurrent_request_transient_name( $blog_id ); |
| 86 | $locked_time = get_site_transient( $transient_name ); |
| 87 | if ( $locked_time ) { |
| 88 | return false; |
| 89 | } |
| 90 | set_site_transient( $transient_name, microtime( true ), $expiry ); |
| 91 | |
| 92 | return true; |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * Retrieve the blog lock transient name for a particular blog. |
| 97 | * |
| 98 | * @access public |
| 99 | * |
| 100 | * @param int $blog_id ID of the blog. |
| 101 | * @return string Name of the blog lock transient. |
| 102 | */ |
| 103 | private function get_concurrent_request_transient_name( $blog_id ) { |
| 104 | return self::BLOG_LOCK_TRANSIENT_PREFIX . $blog_id; |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * Remove the request lock from a particular blog ID. |
| 109 | * |
| 110 | * @access public |
| 111 | * |
| 112 | * @param int $blog_id ID of the blog. |
| 113 | */ |
| 114 | public function remove_request_lock( $blog_id ) { |
| 115 | delete_site_transient( $this->get_concurrent_request_transient_name( $blog_id ) ); |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Receive and process sync events. |
| 120 | * |
| 121 | * @access public |
| 122 | * |
| 123 | * @param array $data Sync events. |
| 124 | * @param object $token The auth token used to invoke the API. |
| 125 | * @param int $sent_timestamp Timestamp (in seconds) when the actions were transmitted. |
| 126 | * @param string $queue_id ID of the queue from which the event was sent (`sync` or `full_sync`). |
| 127 | * @return array Processed sync events. |
| 128 | */ |
| 129 | public function receive( $data, $token = null, $sent_timestamp = null, $queue_id = null ) { |
| 130 | $start_time = microtime( true ); |
| 131 | if ( ! is_array( $data ) ) { |
| 132 | return new WP_Error( 'action_decoder_error', 'Events must be an array' ); |
| 133 | } |
| 134 | |
| 135 | if ( $token && ! $this->attempt_request_lock( $token->blog_id ) ) { |
| 136 | /** |
| 137 | * Fires when the server receives two concurrent requests from the same blog |
| 138 | * |
| 139 | * @since 1.6.3 |
| 140 | * @since-jetpack 4.2.0 |
| 141 | * |
| 142 | * @param token The token object of the misbehaving site |
| 143 | */ |
| 144 | do_action( 'jetpack_sync_multi_request_fail', $token ); |
| 145 | |
| 146 | return new WP_Error( 'concurrent_request_error', 'There is another request running for the same blog ID' ); |
| 147 | } |
| 148 | |
| 149 | $events = wp_unslash( array_map( array( $this->codec, 'decode' ), $data ) ); |
| 150 | $events_processed = array(); |
| 151 | |
| 152 | /** |
| 153 | * Fires when an array of actions are received from a remote Jetpack site |
| 154 | * |
| 155 | * @since 1.6.3 |
| 156 | * @since-jetpack 4.2.0 |
| 157 | * |
| 158 | * @param array Array of actions received from the remote site |
| 159 | */ |
| 160 | do_action( 'jetpack_sync_remote_actions', $events, $token ); |
| 161 | |
| 162 | foreach ( $events as $key => $event ) { |
| 163 | list( $action_name, $args, $user_id, $timestamp, $silent ) = $event; |
| 164 | |
| 165 | /** |
| 166 | * Fires when an action is received from a remote Jetpack site |
| 167 | * |
| 168 | * @since 1.6.3 |
| 169 | * @since-jetpack 4.2.0 |
| 170 | * |
| 171 | * @param string $action_name The name of the action executed on the remote site |
| 172 | * @param array $args The arguments passed to the action |
| 173 | * @param int $user_id The external_user_id who did the action |
| 174 | * @param bool $silent Whether the item was created via import |
| 175 | * @param double $timestamp Timestamp (in seconds) when the action occurred |
| 176 | * @param double $sent_timestamp Timestamp (in seconds) when the action was transmitted |
| 177 | * @param string $queue_id ID of the queue from which the event was sent (sync or full_sync) |
| 178 | * @param array $token The auth token used to invoke the API |
| 179 | */ |
| 180 | do_action( 'jetpack_sync_remote_action', $action_name, $args, $user_id, $silent, $timestamp, $sent_timestamp, $queue_id, $token ); |
| 181 | |
| 182 | $events_processed[] = $key; |
| 183 | |
| 184 | if ( microtime( true ) - $start_time > self::MAX_TIME_PER_REQUEST_IN_SECONDS ) { |
| 185 | break; |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | if ( $token ) { |
| 190 | $this->remove_request_lock( $token->blog_id ); |
| 191 | } |
| 192 | |
| 193 | return $events_processed; |
| 194 | } |
| 195 | } |