javascript – 事件源 – >服务器批量返回事件流,而不是以块的形式返回

I have a PHP script that import large data from csv files with validations.
For that I need to show progress to the user. I have used Event Streaming for that.
When I echo something,I want it to be transferred to client one by one instead of server sent whole output in bulk.
I had already played around with ob_start(),ob_implicit_flush() & ob_flush(),but they didn’t work.
My script is working perfect on another server.
Below server configurations are given:

代码未按要求响应的服务器配置,即

OS: Linux
PHP Version 5.4.36-0+deb7u3
Server API: CGI/FastCGI 
Memory_limit: 128M
output_buffering: no value

正如我所说,代码在另一台具有几乎相同配置的服务器上正常工作,即

OS: Linux
PHP Version 5.4.37
Server API: CGI/FastCGI 
Memory_limit: 256MB
output_buffering: no value

以下是我发送事件的示例代码：

<?PHP
header("Content-Type: text/event-stream");
header("Cache-Control: no-cache");
header("Access-Control-Allow-Origin: *");

$lastEventId = floatval(isset($_SERVER["HTTP_LAST_EVENT_ID"]) ? $_SERVER["HTTP_LAST_EVENT_ID"] : 0);
if ($lastEventId == 0) {
    $lastEventId = floatval(isset($_GET["lastEventId"]) ? $_GET["lastEventId"] : 0);
}

echo ":" . str_repeat(" ",2048) . "\n"; // 2 kB padding for IE
echo "retry: 2000\n";

// event-stream
$i = $lastEventId;

while ($i <= 100) {
    if($i==100){
        echo "data: stop\n";
        ob_flush();
        flush();
        break;
    } else {
        echo "id: " . $i . "\n";
        echo "data: " . $i . ";\n\n";
        ob_flush();
        flush();
        sleep(1);
    }
    $i++;
}
?>

以下是我需要回复的客户端页面：

<!DOCTYPE html>
<html>

<head>
    <Meta charset="utf-8" />
    <title>EventSource example</title>
    <Meta http-equiv="X-UA-Compatible" content="IE=edge">
    <script src="../jquery/eventsource.js"></script>
    <script>
        var es = new EventSource("events.PHP");
        var listener = function(event) {
            console.log(event.data);
            var type = event.type;
            if (event.data == 'stop') {
                es.close();
            } else {
                var div = document.createElement("div");
                div.appendChild(document.createTextNode(type + ": " + (type === "message" ? event.data : es.url)));
                document.body.appendChild(div);
            }
        };
        var errlistener = function(event) {
            es.close();
        }
        es.addEventListener("open",listener);
        es.addEventListener("message",listener);
        es.addEventListener("error",errlistener);
    </script>
</head>

<body>
</body>

</html>

解决方法

将chucked数据返回浏览器的最佳方法是使用Web Sockets让客户端打开文件阅读器的套接字,然后将数据块化到浏览器而不会出现问题.

然后一旦完成,您可以关闭套接字.

一个很好的Web套接字教程
http://www.phpbuilder.com/articles/application-architecture/optimization/creating-real-time-applications-with-php-and-websockets.html

使用这种方法,你可以然后,如果你想要实现验证,所以服务器不只是发送块,它是由javascript请求发送块

所以你的客户可以说我需要块5,你的服务器实现类似的东西

$requestedChunk = 5; // this would be set by the javascript sending the request
$chunkSize = 256; // this would be your chunk size;

$readPossition = $requestedChunk * $chunkSize;

链接不再有效,所以这里是一个建立在Ratchet：https://blog.samuelattard.com/the-tutorial-for-php-websockets-that-i-wish-had-existed/

javascript – 事件源 – >服务器批量返回事件流,而不是以块的形式返回

解决方法

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