Search.php

<?php

namespace App\Jobs;

use App\Jobs\Job;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Http\Request;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Redis;

class Search extends Job implements ShouldQueue
{
    use InteractsWithQueue, SerializesModels;

    protected $hash, $host, $port, $name, $getString, $useragent, $fp;
    protected $buffer_length = 8192;

    /**
     * Create a new job instance.
     *
     * @return void
     */
    public function __construct($hash, $host, $port, $name, $getString, $useragent)
    {
        $this->hash      = $hash;
        $this->host      = $host;
        $this->port      = $port;
        $this->name      = $name;
        $this->getString = $getString;
        $this->useragent = $useragent;
    }

    /**
     * Execute the job.
     *
     * @return void
     */
    public function handle(Request $request)
    {
        $this->fp = $this->getFreeSocket();

        if ($this->fp) {
            if ($this->writeRequest()) {
                $this->readAnswer();
            }
        }
    }

    private function readAnswer()
    {
        $time    = microtime(true);
        $headers = '';
        $body    = '';
        $length  = 0;

        if (!$this->fp) {
            return;
        }

        // get headers FIRST
        $c = 0;
        stream_set_blocking($this->fp, 1);
        do {
            // use fgets() not fread(), fgets stops reading at first newline
            // or buffer which ever one is reached first
            $data = fgets($this->fp, 8192);
            // a sincle CRLF indicates end of headers
            if ($data === false || $data == "\r\n" || feof($this->fp)) {
                // break BEFORE OUTPUT
                break;
            }
            if (sizeof(($tmp = explode(": ", $data))) === 2) {
                $headers[strtolower(trim($tmp[0]))] = trim($tmp[1]);
            }

            $c++;
        } while (true);

        // end of headers
        if (sizeof($headers) > 1) {
            $bodySize = 0;
            if (isset($headers["transfer-encoding"]) && $headers["transfer-encoding"] === "chunked") {
                $body = $this->readChunked();

            } elseif (isset($headers['content-length'])) {
                $length = trim($headers['content-length']);
                if (is_numeric($length) && $length >= 1) {
                    $body = $this->readBody($length);
                }

                $bodySize = strlen($body);
            } else {
                exit;
            }
        } else {
            return;
        }

        Redis::del($this->host . "." . $this->socketNumber);
        if (isset($headers["content-encoding"]) && $headers['content-encoding'] === "gzip") {
            $body = $this->gunzip($body);
        }
        Redis::hset('search.' . $this->hash, $this->name, $body);
        Redis::expire('search.' . $this->hash, 5);
    }

    private function readBody($length)
    {
        $theData = '';
        $done    = false;
        stream_set_blocking($this->fp, 0);
        $startTime = time();
        $lastTime  = $startTime;
        while (!feof($this->fp) && !$done && (($startTime + 1) > time()) && $length !== 0) {
            usleep(100);
            $theNewData = fgets($this->fp, 8192);
            $theData .= $theNewData;
            $length -= strlen($theNewData);
            $done = (trim($theNewData) === '0');

        }
        return $theData;
    }

    private function readChunked()
    {
        $body = '';
        // read from chunked stream
        // loop though the stream
        do {
            // NOTE: for chunked encoding to work properly make sure
            // there is NOTHING (besides newlines) before the first hexlength

            // get the line which has the length of this chunk (use fgets here)
            $line = fgets($this->fp, 8192);

            // if it's only a newline this normally means it's read
            // the total amount of data requested minus the newline
            // continue to next loop to make sure we're done
            if ($line == "\r\n") {
                continue;
            }

            // the length of the block is sent in hex decode it then loop through
            // that much data get the length
            // NOTE: hexdec() ignores all non hexadecimal chars it finds
            $length = hexdec($line);

            if (!is_int($length)) {
                trigger_error('Most likely not chunked encoding', E_USER_ERROR);
            }

            // zero is sent when at the end of the chunks
            // or the end of the stream or error
            if ($line === false || $length < 1 || feof($this->fp)) {
                if ($length <= 0) {
                    fgets($this->fp, 8192);
                }

                // break out of the streams loop
                break;
            }

            // loop though the chunk
            do {
                // read $length amount of data
                // (use fread here)
                $data = fread($this->fp, $length);

                // remove the amount received from the total length on the next loop
                // it'll attempt to read that much less data
                $length -= strlen($data);

                // PRINT out directly
                // you could also save it directly to a file here

                // store in string for later use
                $body .= $data;

                // zero or less or end of connection break
                if ($length <= 0 || feof($this->fp)) {
                    // break out of the chunk loop
                    if ($length <= 0) {
                        fgets($this->fp, 8192);
                    }

                    break;
                }
            } while (true);
            // end of chunk loop
        } while (true);
        // end of stream loop
        return $body;
    }

    private function gunzip($zipped)
    {
        $offset = 0;
        if (substr($zipped, 0, 2) == "\x1f\x8b") {
            $offset = 2;
        }

        if (substr($zipped, $offset, 1) == "\x08") {
            try
            {
                return gzinflate(substr($zipped, $offset + 8));
            } catch (\Exception $e) {
                abort(500, "Fehler beim unzip des Ergebnisses von folgendem Anbieter: " . $this->name);
            }
        }
        return "Unknown Format";
    }

    private function writeRequest()
    {

        $out = "GET " . $this->getString . " HTTP/1.1\r\n";
        $out .= "Host: " . $this->host . "\r\n";
        $out .= "User-Agent: " . $this->useragent . "\r\n";
        $out .= "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n";
        $out .= "Accept-Language: de,en-US;q=0.7,en;q=0.3\r\n";
        $out .= "Accept-Encoding: gzip, deflate, br\r\n";
        $out .= "Connection: keep-alive\r\n\r\n";
        # Anfrage senden:
        $sent   = 0;
        $string = $out;
        $time   = microtime(true);
        while (true) {
            $timeElapsed = microtime(true) - $time;
            if ($timeElapsed > 0.5) {
                # Irgendwas ist mit unserem Socket passiert. Wir brauchen einen neuen:
                if ($this->fp) {
                    fclose($this->fp);
                }

                Redis::del($this->name . "." . $this->socketNumber);
                $this->fp = $this->getFreeSocket();
                $sent     = 0;
                $string   = $out;
                break;
            }
            try {
                $tmp = fwrite($this->fp, $string);
            } catch (\ErrorException $e) {
                # Irgendwas ist mit unserem Socket passiert. Wir brauchen einen neuen:
                try {
                    fclose($this->fp);
                } catch (\ErrorException $e) {

                }

                Redis::del($this->name . "." . $this->socketNumber);
                $this->fp = $this->getFreeSocket();
                $sent     = 0;
                $string   = $out;
                continue;
            }
            if ($tmp) {
                $sent += $tmp;
                $string = substr($string, $tmp);
            }

            if ($sent >= strlen($out)) {
                break;
            }

        }
        if ($sent === strlen($out)) {
            return true;
        }
        return false;
    }

    public function getFreeSocket()
    {
        # Je nach Auslastung des Servers ( gleichzeitige Abfragen ), kann es sein, dass wir mehrere Sockets benötigen um die Abfragen ohne Wartezeit beantworten zu können.
        # pfsockopen öffnet dabei einen persistenten Socket, der also auch zwischen den verschiedenen php Prozessen geteilt werden kann.
        # Wenn der Hostname mit einem bereits erstellten Socket übereinstimmt, wird die Verbindung also aufgegriffen und fortgeführt.
        # Allerdings dürfen wir diesen nur verwenden, wenn er nicht bereits von einem anderen Prozess zur Kommunikation verwendet wird.
        # Wenn dem so ist, probieren wir den nächsten Socket zu verwenden.
        # Dies festzustellen ist komplizierter, als man sich das vorstellt. Folgendes System sollte funktionieren:
        # 1. Stelle fest, ob dieser Socket neu erstellt wurde, oder ob ein existierender geöffnet wurde.
        $counter = 0;
        $fp      = null;
        do {

            if (intval(Redis::exists($this->host . ".$counter")) === 0) {
                Redis::set($this->host . ".$counter", 1);
                Redis::expire($this->host . ".$counter", 5);
                $this->socketNumber = $counter;

                try
                {
                    $fp = pfsockopen($this->getHost() . ":" . $this->port . "/$counter", $this->port, $errstr, $errno, 1);
                } catch (\ErrorException $e) {
                    break;
                }
                # Wir gucken, ob der Lesepuffer leer ist:
                stream_set_blocking($fp, 0);
                $string = fgets($fp, 8192);
                if ($string !== false || feof($fp)) {
                    fclose($fp);
                    continue;
                }
                break;
            }
            $counter++;
        } while (true);
        return $fp;
    }

    public function getHost()
    {
        $return = "";
        if ($this->port === "443") {
            $return .= "tls://";
        } else {
            $return .= "tcp://";
        }
        $return .= $this->host;
        return $return;
    }
}