Question

我正在尝试部署服务器发送的事件来替换我的应用程序中的ajax长轮询。在perl脚本中，睡眠阻止了发送流。

#!/opt/lampp/bin/perl
print "Content-Type: text/event-stream\n\n";
 while(1){
  print "event: server-time\n";
  my $time = localtime();
  print "data: $time\n\n";
 }

此代码有效。但是，睡眠不起作用。只是流媒体

而不是打印它继续加载的内容。

HTML片段：

<head>
 <script type="text/javascript">
  function invokeSSE(){
  var source = new EventSource('test.pl');
  source.addEventListener('server-time', function(e) {
  document.getElementById('ticker').innerHTML = e.data + '<br>';
  }, false);
  source.addEventListener('open', function(e) {
  alert('open');
  }, false);
  source.addEventListener('error', function(e) {
  if (e.readyState == EventSource.CLOSED) {
  alert("Connection closed"); 
  }
  }, false);
  }
 </script>
</head>
<body onload="invokeSSE()">
 <div id="ticker" name="ticker">
  [TIME]
 </div>
</body>

Answer 1

睡眠总是阻止，这是设计的。

你应该为此创建一个基于事件的应用程序，你可以使用Dancer，Mojolicious。

来自：http://mojolicio.us/perldoc/Mojolicious/Guides/Cookbook#Streaming_response

use Mojo::UserAgent;

# Build a normal transaction
my $ua = Mojo::UserAgent->new;
my $tx = $ua->build_tx(GET => 'http://example.com');

# Prepare body
my $body = 'Hello world!';
$tx->req->headers->content_length(length $body);

# Start writing directly with a drain callback
my $drain;
$drain = sub {
  my $content = shift;
  my $chunk   = substr $body, 0, 1, '';
  $drain      = undef unless length $body;
  $content->write($chunk, $drain);
};
$tx->req->content->$drain;

# Process transaction
$tx = $ua->start($tx);

Perl和Html5 ServerSentEvents

1 个答案: