我有这个代码片段,我试图每隔 X 秒将一个字符串推送到服务器,例如:
#!/usr/bin/env perl
use Mojolicious::Lite;
use EV;
use AnyEvent;
use POSIX qw(strftime);
get '/' => sub {
my $self = shift;
$self->render('main');
};
websocket '/echo' => sub {
my $self = shift;
my $w;
$w = AE::timer 3, 1, sub {
$self->send('Got it');
};
# $self->send(strftime("Server $$: %a %b %e %H:%M:%S %Y", localtime));
};
app->start();
__DATA__
@@ main.html.ep
<html>
<head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
</head>
<body>
<table id="tableID">
<tbody>
</tbody>
</table>
<script type="text/javascript">
var ws = new WebSocket('ws://192.168.1.104:3000/echo');
ws.onopen = function () {
alert('Connection opened');
};
ws.onerror = function() { alert("Error"); };
ws.onmessage = function (msg) {
$("#tableID").find('tbody')
.append($('<tr>')
.append($('<td>')
.text(msg.data)
)
);
};
</script>
</body>
</html>
AFAIK Mojo 使用了 IO::Loop
事件循环,我想 AnyEvent
应该没问题
这行不通,我想知道为什么。
当我删除 AE 部分并取消注释简单的 send
时,我在浏览器中看到了结果。
P.S:只是在某些项目中尝试使用 WebSockets 和 Mojo,我需要同时使用 Mojo 和 AnyEvent + WebSockets
最佳答案
问题似乎是发送消息试图在 GET 连接升级到 websocket 之前发生。我仍在尝试追踪它,与此同时它起作用了。
#!/usr/bin/env perl
use Mojolicious::Lite;
use EV;
use AnyEvent;
#use POSIX qw(strftime);
get '/' => sub {
my $self = shift;
$self->render('main');
};
websocket '/echo' => sub {
my $self = shift;
my $w;
$self->on(finish => sub { Mojo::IOLoop->remove($w) });
# $self->send(strftime("Server $$: %a %b %e %H:%M:%S %Y", localtime));
$w = Mojo::IOLoop->recurring( 1 => sub{
$self->send('Got it');
});
};
app->start();
__DATA__
@@ main.html.ep
<html>
<head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
</head>
<body>
<table id="tableID">
<tbody>
</tbody>
</table>
<script type="text/javascript">
var ws = new WebSocket("<%= url_for('echo')->to_abs %>");
ws.onopen = function () {
alert('Connection opened');
};
ws.onerror = function() { alert("Error"); };
ws.onmessage = function (msg) {
$("#tableID").find('tbody')
.append($('<tr>')
.append($('<td>')
.text(msg.data)
)
);
};
</script>
</body>
</html>
请注意,在我的示例中,调试输出显示 101 switching protocols
,而您的示例尝试自动呈现 echo.html.ep
。
我还更改了模板以生成 websocket url。
更新:
似乎为了连接到 websocket,必须订阅一个事件。在此示例中,我订阅了 finish 事件,您无论如何都想这样做以停止计时器。
#!/usr/bin/env perl
use Mojolicious::Lite;
use EV;
use AnyEvent;
#use POSIX qw(strftime);
get '/' => sub {
my $self = shift;
$self->render('main');
};
websocket '/echo' => sub {
my $self = shift;
my $w;
$w = AE::timer 3, 1, sub {
$self->send('Got it');
};
$self->on(finish => sub{ undef $w });
# $self->send(L<Mojolicious::Controller/strftime("Server $$: %a %b %e %H:%M:%S %Y", localtime));
};
app->start();
更新 2:
为了弄清楚问题,SRI有added the following documentation to Mojolicious :
The connection gets established when you respond to the WebSocket handshake with a 101 response status, which happens automatically if you subscribe to an event with "on" or send a message with "send" right away.
这说明了情况。原始代码既不订阅事件也不立即发送 。在几乎所有情况下,您至少会执行两者之一,但在这种情况下 :-)
关于html - 有趣且延迟的 WebSocket,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17113399/