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我想以适当的方式断开与 RabbitMQ 的连接。通过查看Perl 的AnyEvent::RabbitMQ（我正在使用）的源代码，我发现似乎关闭所有打开到 RabbitMQ 的通道的方法。close

所以我

  1. 连接到 RabbitMQ
  2. 开通了渠道
  3. 宣布交换
  4. 绑定到那个交易所
  5. 声明了一个队列
  6. 绑定到那个队列
  7. 在实例（不是实例）上执行close方法AnyEvent::RabbitMQ::Channel

连接似乎已关闭，但 RabbitMQ 日志显示“AMQP 连接”为“connection_closed_abruptly”。

这是该连接的完整 RabbitMQ 日志：

=INFO REPORT==== 14-Jan-2016::10:02:15 ===
accepting AMQP connection <0.10868.0> (127.0.0.1:57764 -> 127.0.0.1:5672)

=WARNING REPORT==== 14-Jan-2016::10:02:16 ===
closing AMQP connection <0.10868.0> (127.0.0.1:57764 -> 127.0.0.1:5672):
connection_closed_abruptly

这是示例代码：

#!/usr/bin/perl
use strictures 1;

use AnyEvent::RabbitMQ;
use Data::Printer;

my ( $rabbitmq, $rabbitmq_channel );

my $condvar = AnyEvent->condvar;

$rabbitmq = AnyEvent::RabbitMQ->new->load_xml_spec()->connect(
  host       => '127.0.0.1',
  port       => 5672,
  user       => 'guest',
  pass       => 'guest',
  vhost      => '/',
  timeout    => 1,
  tls        => 0,
  tune       => { heartbeat => 1 },
  on_success => sub {
    ($rabbitmq) = @_;
    $rabbitmq->open_channel(
      on_success => sub {
        ($rabbitmq_channel) = @_;
        $rabbitmq_channel->confirm;
        $rabbitmq_channel->declare_exchange(
          exchange   => 'test_exchange',
          type       => 'fanout',
          on_success => sub {
            $rabbitmq_channel->bind_exchange(
              source      => 'test_exchange',
              destination => 'test_exchange',
              routing_key => '',
              on_success  => sub {
                $rabbitmq_channel->declare_queue(
                  queue      => 'test_queue',
                  on_success => sub {
                    $rabbitmq_channel->bind_queue(
                      queue       => 'test_queue',
                      exchange    => 'test_exchange',
                      routing_key => '',
                      on_success  => sub {
                        $rabbitmq->close;
                        undef $rabbitmq;
                      },
                      on_failure => sub { $condvar->send( __LINE__, @_ ) },
                    );
                  },
                  on_failure => sub { $condvar->send( __LINE__, @_ ) },
                );
              },
              on_failure => sub { $condvar->send( __LINE__, @_ ) },
            );
          },
          on_failure => sub { $condvar->send( __LINE__, @_ ) },
        );
      },
      on_failure => sub { $condvar->send( __LINE__, @_ ) },
      on_return  => sub { $condvar->send( __LINE__, @_ ) },
      on_close   => sub { $condvar->send( __LINE__, @_ ) },
    );
  },
  on_failure      => sub { $condvar->send( __LINE__, @_ ) },
  on_read_failure => sub { $condvar->send( __LINE__, @_ ) },
  on_return       => sub { $condvar->send( __LINE__, @_ ) },
  on_close        => sub { $condvar->send( __LINE__, @_ ) },
);

my $reason = [ $condvar->recv ];
p $reason;

如何使用 Perl 正确断开与 RabbitMQ 的连接AnyEvent::RabbitMQ？

4

2 回答 2

1

有参考周期的指标。这些可以防止结构被正确破坏。

  1. " my $rabbitmq; $rabbitmq = ..." 大声喊出引用循环的可能性。

  2. " my $rabbitmq_channel; $rabbitmq_channel = ..." 大声喊出引用循环的可能性。

  3. $rabbitmq_channel由 (stored in) 拥有$rabbitmq，但它也被$rabbitmq_channel的事件处理程序捕获。

标记的更改<===替换不可接受的代码。

标记的更改<---可能是必要的。如果$rabbitmq_channel在回调中未定义，则删除此更改。

use Scalar::Util qw( weaken );

my $done_cv = AnyEvent->condvar;

my $rabbitmq = AnyEvent::RabbitMQ->new->load_xml_spec()->connect(  # <===
  host       => '127.0.0.1',
  port       => 5672,
  user       => 'guest',
  pass       => 'guest',
  vhost      => '/',
  timeout    => 1,
  tls        => 0,
  tune       => { heartbeat => 1 },
  on_success => sub {
    my ($rabbitmq) = @_;  # <===
    $rabbitmq->open_channel(
      on_success => sub {
        my ($rabbitmq_channel) = @_;  # <===
        {  # <---
          my $rabbitmq_channel = weaken($rabbitmq_channel);  # <---
          $rabbitmq_channel->confirm;
          $rabbitmq_channel->declare_exchange(
            exchange   => 'test_exchange',
            type       => 'fanout',
            on_success => sub {
              $rabbitmq_channel->bind_exchange(
                source      => 'test_exchange',
                destination => 'test_exchange',
                routing_key => '',
                on_success  => sub {
                  $rabbitmq_channel->declare_queue(
                    queue      => 'test_queue',
                    on_success => sub {
                      $rabbitmq_channel->bind_queue(
                        queue       => 'test_queue',
                        exchange    => 'test_exchange',
                        routing_key => '',
                        on_success  => sub { $done_cv->send( __LINE__, @_ ) },  # <===
                        on_failure => sub { $done_cv->send( __LINE__, @_ ) },
                      );
                    },
                    on_failure => sub { $done_cv->send( __LINE__, @_ ) },
                  );
                },
                on_failure => sub { $done_cv->send( __LINE__, @_ ) },
              );
            },
            on_failure => sub { $done_cv->send( __LINE__, @_ ) },
          );
        }  # <---
      },
      on_failure => sub { $done_cv->send( __LINE__, @_ ) },
      on_return  => sub { $done_cv->send( __LINE__, @_ ) },
      on_close   => sub { $done_cv->send( __LINE__, @_ ) },
    );
  },
  on_failure      => sub { $done_cv->send( __LINE__, @_ ) },
  on_read_failure => sub { $done_cv->send( __LINE__, @_ ) },
  on_return       => sub { $done_cv->send( __LINE__, @_ ) },
  on_close        => sub { $done_cv->send( __LINE__, @_ ) },
);

my $reason = [ $done_cv->recv ];
p $reason;

我希望这有帮助。

于 2016-01-18T15:58:07.497 回答
0

问题是 AnyEvent::RabbitMQ.pm 库本身的一个错误。我不确定如何修复sub close自身，但关键部分是它从不执行在全局解构期间将Connection::Close和Connection::CloseOk方法发送到 RabbitMQ 服务器的代码。设置 AMQP 连接后，您可以通过执行以下操作进行确认。

$rabbitmq->_push_write(Net::AMQP::Protocol::Connection::Close->new());
$rabbitmq->_push_write(Net::AMQP::Protocol::Connection::CloseOk->new());

这有点像 hack，所以我正在研究正确的方法，希望维护者能接受拉取请求。

于 2016-04-16T11:13:10.830 回答