Transforms HAR file format to Blackfire file format

har2blackfire.php

<?php

// Transforms a HAR (HTTP Archive) file into a BK file to analyze it using
// Blackfire Profiler (https://blackfire.io/)
//
// USAGE:
// $ php har2blackfire.php name-of-the-HAR-file.har

$harFile = $argv[1];
$harData = json_decode(file_get_contents($harFile), true);

// group requests by host
$groupedRequests = array();
$totalRequestTime = 0;  // miliseconds * 1000
$totalResponseSize = 0; // bytes

foreach ($harData['log']['entries'] as $entry) {
    $urlParts = parse_url($entry['request']['url']);
    $requestHost = $urlParts['host'];

    $groupedRequests[$requestHost]['entries'][] = $entry;

    if (!array_key_exists('total_group_time', $groupedRequests[$requestHost])) {
        $groupedRequests[$requestHost]['total_group_time'] = 0;
    }
    $groupedRequests[$requestHost]['total_group_time'] += (1000 * $entry['time']);
    $totalRequestTime += (1000 * $entry['time']);

    if (!array_key_exists('total_group_size', $groupedRequests[$requestHost])) {
        $groupedRequests[$requestHost]['total_group_size'] = 0;
    }
    $responseBodySize = max(0, $entry['response']['bodySize']);
    $groupedRequests[$requestHost]['total_group_size'] += $responseBodySize;
    $totalResponseSize += $responseBodySize;
}

$dumpNodes = '';

// dump first-level nodes (hosts)
foreach ($groupedRequests as $host => $data) {
    $dumpNodes .= sprintf("main()==>%s//%d %d %d\n", $host, count($data['entries']), $data['total_group_time'], $data['total_group_size']);
}

// dump second-level nodes (requests)
foreach ($groupedRequests as $host => $data) {
    foreach ($data['entries'] as $entry) {
        $urlParts = parse_url($entry['request']['url']);
        $requestPath = $urlParts['path'];

        $dumpNodes .= sprintf("%s==>%s::%s//%d %d %d\n", $host, $requestPath, $host, 1, 1000 * $entry['time'], max(0, $entry['response']['bodySize']));
    }
}

$harFileTitle = $harData['log']['pages'][0]['title'];
$harFileDate = (new DateTime($harData['log']['pages'][0]['startedDateTime']))->format('d/m/Y H:i');

$dumpContents =
    "file-format: BlackfireProbe\n"
    ."cost-dimensions: wt mu\n"
    .sprintf("profile-title: %s (%s)\n", $harFileTitle, $harFileDate)
    ."\n"
    .sprintf("main()//1 %d %d\n", $totalRequestTime, $totalResponseSize)
    .$dumpNodes
;

$blackfireDumpFilepath = __DIR__.'/profile.bk';
file_put_contents($blackfireDumpFilepath, $dumpContents);
echo sprintf("The Blackfire profile file has been successfully generated in\n%s\n", $blackfireDumpFilepath);