AgeTracker.php in Pantheon Advanced Page Cache 8

Namespace

PantheonSystems\CDNBehatHelpers

File

tests/behat/helper_classes/AgeTracker.php

<?php

namespace PantheonSystems\CDNBehatHelpers;

use Behat\Mink\Session;
final class AgeTracker {
  public function headersToTrack() {
    return [
      'age',
      'cache-control',
      'x-timer',
    ];
  }
  public function trackSessionHeaders($path, Session $session) {
    $tracked_headers = [];
    foreach ($this
      ->headersToTrack() as $header_name) {
      $tracked_headers[$header_name] = $session
        ->getResponseHeader($header_name);
    }
    $this->headers[$path][] = $tracked_headers;
  }
  public function trackHeaders($path, $headers) {
    $headers = array_change_key_case($headers, CASE_LOWER);
    $this->headers[$path][] = array_filter($headers, function ($v, $k) {

      // Filter out headers that won't help with debugging.
      $tracked_headers = [
        'age',
        'cache-control',
        'x-timer',
      ];
      return in_array($k, $tracked_headers);
    }, ARRAY_FILTER_USE_BOTH);
  }
  public function getTrackedHeaders($path) {
    return $this->headers[$path];
  }
  public function wasCacheClearedBetweenLastTwoRequests($path) {

    // Assign the headers to a new variable so that $this->headers is not modified by array_pop().
    $headers = $this->headers[$path];
    $most_recent = array_pop($headers);
    $second_most_recent = array_pop($headers);

    // If the age header on the most recent request is smaller than the age header on the second most recent
    // Then the cache was cleared (@todo, or it expired (account for max age))
    $return = (int) $most_recent['age'] < (int) $second_most_recent['age'];
    return $return;
  }
  public function ageIncreasedBetweenLastTwoRequests($path) {

    // Assign the headers to a new variable so that $this->headers is not modified by array_pop().
    $headers = $this->headers[$path];
    $most_recent = array_pop($headers);
    $second_most_recent = array_pop($headers);
    $return = (int) $most_recent['age'] > (int) $second_most_recent['age'];
    return $return;
  }

}

Classes

Name	Description
AgeTracker