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Add initial Server Timing response headers
See #990
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| <?php | ||
| /** | ||
| * Class AMP_Response_Headers | ||
| * | ||
| * @since 1.0 | ||
| * @package AMP | ||
| */ | ||
|
|
||
| /** | ||
| * Class AMP_Response_Headers | ||
| */ | ||
| class AMP_Response_Headers { | ||
|
|
||
| /** | ||
| * Headers sent (or attempted to be sent). | ||
| * | ||
| * @since 1.0 | ||
| * @see AMP_Theme_Support::send_header() | ||
| * @var array[] | ||
| */ | ||
| public static $headers_sent = array(); | ||
|
|
||
| /** | ||
| * Send an HTTP response header. | ||
| * | ||
| * This largely exists to facilitate unit testing but it also provides a better interface for sending headers. | ||
| * | ||
| * @since 0.7.0 | ||
| * | ||
| * @param string $name Header name. | ||
| * @param string $value Header value. | ||
| * @param array $args { | ||
| * Args to header(). | ||
| * | ||
| * @type bool $replace Whether to replace a header previously sent. Default true. | ||
| * @type int $status_code Status code to send with the sent header. | ||
| * } | ||
| * @return bool Whether the header was sent. | ||
| */ | ||
| public static function send_header( $name, $value, $args = array() ) { | ||
| $args = array_merge( | ||
| array( | ||
| 'replace' => true, | ||
| 'status_code' => null, | ||
| ), | ||
| $args | ||
| ); | ||
|
|
||
| self::$headers_sent[] = array_merge( compact( 'name', 'value' ), $args ); | ||
| if ( headers_sent() ) { | ||
| return false; | ||
| } | ||
|
|
||
| header( | ||
| sprintf( '%s: %s', $name, $value ), | ||
| $args['replace'], | ||
| $args['status_code'] | ||
| ); | ||
| return true; | ||
| } | ||
|
|
||
| /** | ||
| * Send Server-Timing header. | ||
| * | ||
| * @since 1.0 | ||
| * @todo What is the ordering in Chrome dev tools? What are the colors about? | ||
| * @todo Is there a better name standardization? | ||
| * @todo Is there a way to indicate nested server timings, so an outer method's own time can be seen separately from the inner method's time? | ||
| * | ||
| * @param string $name Name. | ||
| * @param float $duration Duration. If negative, will be added to microtime( true ). Optional. | ||
| * @param string $description Description. Optional. | ||
| * @return bool Return value of send_header call. | ||
| */ | ||
| public static function send_server_timing( $name, $duration = null, $description = null ) { | ||
| $value = $name; | ||
| if ( isset( $description ) ) { | ||
| $value .= sprintf( ';desc=%s', wp_json_encode( $description ) ); | ||
| } | ||
| if ( isset( $duration ) ) { | ||
| if ( $duration < 0 ) { | ||
| $duration = microtime( true ) + $duration; | ||
| } | ||
| $value .= sprintf( ';dur=%f', $duration * 1000 ); | ||
| } | ||
| return self::send_header( 'Server-Timing', $value, array( 'replace' => false ) ); | ||
| } | ||
| } |
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