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| 1 | <?php |
| 2 | /** |
| 3 | * WPCOMSH Log file. |
| 4 | * |
| 5 | * @package wpcomsh |
| 6 | */ |
| 7 | |
| 8 | /** |
| 9 | * Class WPCOMSH_Log |
| 10 | * |
| 11 | * This is an interface for logging arbitrary data to wpcom logstash cluster. |
| 12 | * This auto-initializes and provides a hook to log data: |
| 13 | * ``` |
| 14 | * do_action( 'wpcomsh_log', "test" ); |
| 15 | * ``` |
| 16 | * |
| 17 | * You can see logs in Kibana, log2logstash index, under `feature:automated_transfer` |
| 18 | * by default. Records sent via `unsafe_direct_log_logstash()` land under the |
| 19 | * caller-supplied `feature:` bucket instead. |
| 20 | * |
| 21 | * Note that logging must be enabled for the site for the logs to be sent, |
| 22 | * which involves enabling the `at_options_logging_on` site option on the |
| 23 | * Jetpack site. |
| 24 | */ |
| 25 | class WPCOMSH_Log { |
| 26 | /** |
| 27 | * Logging Endpoint URL. |
| 28 | * |
| 29 | * @var string |
| 30 | */ |
| 31 | protected static $log_endpoint = 'https://public-api.wordpress.com/rest/v1.1/automated-transfers/log'; |
| 32 | |
| 33 | /** |
| 34 | * Logstash endpoint URL — drained by `unsafe_direct_log_logstash()`, |
| 35 | * which lets each record land under its own Kibana `feature` bucket |
| 36 | * instead of the default `feature:automated_transfer` stream. |
| 37 | * |
| 38 | * @var string |
| 39 | */ |
| 40 | protected static $logstash_endpoint = 'https://public-api.wordpress.com/rest/v1.1/logstash'; |
| 41 | |
| 42 | /** |
| 43 | * Class instance. |
| 44 | * |
| 45 | * @var WPCOMSH_Log |
| 46 | */ |
| 47 | private static $instance; |
| 48 | |
| 49 | /** |
| 50 | * Queue of log messages bound for /automated-transfers/log. |
| 51 | * |
| 52 | * @var array |
| 53 | */ |
| 54 | private $log_queue = array(); |
| 55 | |
| 56 | /** |
| 57 | * Queue of log messages bound for /logstash. Each entry carries its own |
| 58 | * feature/severity so the receiver can bucket records distinctly. |
| 59 | * |
| 60 | * @var array |
| 61 | */ |
| 62 | private $logstash_queue = array(); |
| 63 | |
| 64 | /** |
| 65 | * Whether it has a shutdown hook. |
| 66 | * |
| 67 | * @var bool |
| 68 | */ |
| 69 | private $has_shutdown_hook = false; |
| 70 | |
| 71 | /** |
| 72 | * Site URL. |
| 73 | * |
| 74 | * @var string |
| 75 | */ |
| 76 | private $siteurl; |
| 77 | |
| 78 | /** |
| 79 | * This instantiates the logging system. Because constructor is private, it can be only set up with `init` or `unsafe_direct_log`. |
| 80 | * `init` respects `at_options_logging_on` option. This essentially turns logging on/off so that we don't flood |
| 81 | * endpoint with too many requests. |
| 82 | * This is to be hooked into wp `init` hook. |
| 83 | */ |
| 84 | public static function init() { |
| 85 | if ( ! get_option( 'at_options_logging_on' ) ) { |
| 86 | return; |
| 87 | } |
| 88 | |
| 89 | if ( self::$instance ) { |
| 90 | return; |
| 91 | } |
| 92 | |
| 93 | self::$instance = new self(); |
| 94 | self::$instance->add_hooks(); |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * This method bypasses `at_options_logging_on` check. |
| 99 | * It is intended to be used when we are sure we want to send logs to logstash and |
| 100 | * we are sure that we don't fire it off frequently. Good example of when we want to use this |
| 101 | * is during the site setup process |
| 102 | * |
| 103 | * @param string $message Log message. |
| 104 | * @param array $extra Optional. Additional log data. Defaults to empty array. |
| 105 | */ |
| 106 | public static function unsafe_direct_log( $message, $extra = array() ) { |
| 107 | if ( ! self::$instance ) { |
| 108 | self::$instance = new self(); |
| 109 | } |
| 110 | self::$instance->log( $message, $extra ); |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Direct counterpart to `unsafe_direct_log()` for records that should |
| 115 | * land on the public `/logstash` endpoint under their own |
| 116 | * `feature` bucket instead of the default `feature:automated_transfer` |
| 117 | * stream that `/automated-transfers/log` writes into. |
| 118 | * |
| 119 | * Use this when the record needs to be alertable / dashboarded |
| 120 | * independently from the automated-transfer telemetry firehose. |
| 121 | * Like `unsafe_direct_log()`, this bypasses the |
| 122 | * `at_options_logging_on` site option, so callers must ensure they |
| 123 | * don't fire it off frequently. |
| 124 | * |
| 125 | * @param string $feature Logstash `feature` bucket. |
| 126 | * @param string $message Log message. |
| 127 | * @param array $options { |
| 128 | * Optional. Per-record options. |
| 129 | * |
| 130 | * @type array $properties Structured key-value data, indexed under `properties.*` in Kibana for filtering / sorting / aggregation. |
| 131 | * @type string $severity Severity tag (e.g. 'critical', 'error', 'warning', 'info'). |
| 132 | * @type array $extra Unstructured context — preserved on the record but not intended for term-aggregation. |
| 133 | * } |
| 134 | */ |
| 135 | public static function unsafe_direct_log_logstash( $feature, $message, $options = array() ) { |
| 136 | if ( ! self::$instance ) { |
| 137 | self::$instance = new self(); |
| 138 | } |
| 139 | self::$instance->log_to_logstash( $feature, $message, $options ); |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * Constructor. |
| 144 | */ |
| 145 | private function __construct() { |
| 146 | $this->siteurl = get_site_url(); |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * Adds the log action. |
| 151 | */ |
| 152 | private function add_hooks() { |
| 153 | add_action( 'wpcomsh_log', array( $this, 'log' ), 1 ); |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * Logs a log message. |
| 158 | * |
| 159 | * @param string $message Log message. |
| 160 | * @param array $extra Optional. Additional log data. Defaults to empty array. |
| 161 | */ |
| 162 | public function log( $message, $extra = array() ) { |
| 163 | $this->log_queue[] = array( |
| 164 | 'message' => $message, |
| 165 | 'extra' => $extra, |
| 166 | ); |
| 167 | $this->ensure_shutdown_hook(); |
| 168 | } |
| 169 | |
| 170 | /** |
| 171 | * Queue a record for the `/logstash` endpoint. Drained on shutdown by |
| 172 | * `send_to_api()` alongside the `/automated-transfers/log` queue. |
| 173 | * |
| 174 | * @param string $feature Logstash `feature` bucket. |
| 175 | * @param string $message Log message. |
| 176 | * @param array $options Optional per-record options: `properties`, `severity`, `extra`. |
| 177 | * See `unsafe_direct_log_logstash()` for details. |
| 178 | */ |
| 179 | public function log_to_logstash( $feature, $message, $options = array() ) { |
| 180 | $entry = array( |
| 181 | 'feature' => $feature, |
| 182 | 'message' => $message, |
| 183 | ); |
| 184 | if ( ! empty( $options['properties'] ) ) { |
| 185 | $entry['properties'] = (array) $options['properties']; |
| 186 | } |
| 187 | if ( ! empty( $options['severity'] ) ) { |
| 188 | $entry['severity'] = (string) $options['severity']; |
| 189 | } |
| 190 | if ( ! empty( $options['extra'] ) ) { |
| 191 | $entry['extra'] = (array) $options['extra']; |
| 192 | } |
| 193 | $this->logstash_queue[] = $entry; |
| 194 | $this->ensure_shutdown_hook(); |
| 195 | } |
| 196 | |
| 197 | /** |
| 198 | * Register the shared shutdown drain on first enqueue. |
| 199 | */ |
| 200 | private function ensure_shutdown_hook() { |
| 201 | if ( $this->has_shutdown_hook ) { |
| 202 | return; |
| 203 | } |
| 204 | register_shutdown_function( array( $this, 'send_to_api' ) ); |
| 205 | $this->has_shutdown_hook = true; |
| 206 | } |
| 207 | |
| 208 | /** |
| 209 | * Sends log messages to the API endpoint. |
| 210 | */ |
| 211 | public function send_to_api() { |
| 212 | if ( count( $this->log_queue ) > 0 ) { |
| 213 | $payload = array( |
| 214 | 'siteurl' => $this->siteurl, |
| 215 | 'messages' => $this->log_queue, |
| 216 | ); |
| 217 | |
| 218 | wp_remote_post( self::$log_endpoint, array( 'body' => array( 'error' => wp_json_encode( $payload, JSON_UNESCAPED_SLASHES ) ) ) ); |
| 219 | } |
| 220 | |
| 221 | foreach ( $this->logstash_queue as $entry ) { |
| 222 | wp_remote_post( self::$logstash_endpoint, array( 'body' => array( 'params' => wp_json_encode( $entry, JSON_UNESCAPED_SLASHES ) ) ) ); |
| 223 | } |
| 224 | } |
| 225 | } |
| 226 | add_action( 'init', array( 'WPCOMSH_Log', 'init' ) ); |