AnyEvent-Stomper

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lib/AnyEvent/Stomper.pm  view on Meta::CPAN

sub _create_on_drain {
  my $self = shift;

  weaken($self);

  return sub {
    return unless @{ $self->{_write_queue} };

    $self->{_temp_write_queue} = $self->{_write_queue};
    $self->{_write_queue} = [];

    while ( my $cmd = shift @{ $self->{_temp_write_queue} } ) {
      $cmd->{on_receipt}->();
    }
  };
}

sub _create_on_read {
  my $self = shift;

  weaken($self);

  my $cmd_name;
  my $headers;

  return sub {
    my $handle = shift;

    my $frame;

    while (1) {
      return if $handle->destroyed;

      if ( defined $cmd_name ) {
        my $content_length;
        if ( defined $headers->{'content-length'} ) {
          $content_length = $headers->{'content-length'};
          return if length( $handle->{rbuf} ) < $content_length + 1;
        }
        else {
          $content_length = index( $handle->{rbuf}, "\0" );
          return if $content_length < 0
        }

        my $body = substr( $handle->{rbuf}, 0, $content_length, '' );
        $handle->{rbuf} =~ s/^\0(?:${\(RE_EOL)})*//;

        $frame = _new_frame( $cmd_name, $headers, $body );

        undef $cmd_name;
        undef $headers;
      }
      else {
        $handle->{rbuf} =~ s/^(?:${\(RE_EOL)})+//;

        return unless $handle->{rbuf} =~ s/^(.+?)(?:${\(RE_EOL)}){2}//s;

        ( $cmd_name, my @header_strings ) = split( m/${\(RE_EOL)}/, $1 );
        foreach my $header_str (@header_strings) {
          my ( $name, $value ) = split( /:/, $header_str, 2 );
          $headers->{ _unescape($name) } = _unescape($value);
        }

        next;
      }

      $self->_process_frame($frame);
    }
  };
}

sub _prepare {
  my $self     = shift;
  my $cmd_name = uc(shift);
  my $args     = shift;

  my %params;

  if ( ref( $args->[-1] ) eq 'CODE'
    && scalar @{$args} % 2 > 0 )
  {
    if ( $cmd_name eq 'SUBSCRIBE' ) {
      $params{on_message} = pop @{$args};
    }
    else {
      $params{on_receipt} = pop @{$args};
    }
  }

  my %headers = @{$args};

  foreach my $name ( qw( body on_receipt on_message ) ) {
    if ( defined $headers{$name} ) {
      $params{$name} = delete $headers{$name};
    }
  }
  if ( exists $ACK_CMDS{$cmd_name} ) {
    $params{message} = delete $headers{message};
  }

  %headers = (
    %{ $self->{default_headers} },

    defined $self->{command_headers}{$cmd_name}
    ? %{ $self->{command_headers}{$cmd_name} }
    : (),

    %headers,
  );

  my $cmd = {
    name    => $cmd_name,
    headers => \%headers,
    %params,
  };

  unless ( defined $cmd->{on_receipt} ) {
    weaken($self);

    $cmd->{on_receipt} = sub {
      my $receipt = shift;

lib/AnyEvent/Stomper.pm  view on Meta::CPAN

sub _push_write {
  my $self = shift;
  my $cmd  = shift;

  my $cmd_headers = $cmd->{headers};

  if ( exists $ACK_CMDS{ $cmd->{name} } ) {
    unless ( $self->_check_ack( $cmd->{message} ) ) {
      my $err = _new_error( "Unexpected $cmd->{name} sent.", E_OPRN_ERROR );
      AE::postpone { $cmd->{on_receipt}->( undef, $err ) };

      return;
    }

    my $msg_headers = $cmd->{message}->headers;

    if ( $self->{_version} <= 1.1 ) {
      $cmd_headers->{'message-id'} = $msg_headers->{'message-id'};
      if ( $self->{_version} > 1.0 ) {
        $cmd_headers->{subscription} = $msg_headers->{subscription};
      }
    }
    else {
      $cmd_headers->{id} = $msg_headers->{ack};
    }
  }

  if ( exists $NEED_RECEIPT{ $cmd->{name} }
    || defined $cmd_headers->{receipt} )
  {
    if ( $cmd->{name} eq 'CONNECT' ) {
      $self->{_pending_receipts}{CONNECTED} = $cmd;
    }
    else {
      if ( !defined $cmd_headers->{receipt}
        || $cmd_headers->{receipt} eq 'auto' )
      {
        $cmd_headers->{receipt} = 'R_' . $self->{_session_id} . '.'
            . $RECEIPT_SEQ++;
      }
      $self->{_pending_receipts}{ $cmd_headers->{receipt} } = $cmd;
    }
  }
  else {
    push( @{ $self->{_write_queue} }, $cmd );
  }

  my $body = $cmd->{body};
  unless ( defined $body ) {
    $body = '';
  }
  unless ( defined $cmd_headers->{'content-length'} ) {
    $cmd_headers->{'content-length'} = length($body);
  }

  my $frame_str = $cmd->{name} . EOL;
  while ( my ( $name, $value ) = each %{$cmd_headers} ) {
    unless ( defined $value ) {
      $value = '';
    }
    $frame_str .= _escape($name) . ':' . _escape($value) . EOL;
  }
  $frame_str .= EOL . "$body\0";

  $self->{_handle}->push_write($frame_str);

  return;
}

sub _login {
  my $self = shift;

  my ( $cx, $cy ) = @{ $self->{heartbeat} };

  if ( $cy > 0 ) {
    $self->_rtimeout($cy);
  }

  my %cmd_headers = (
    'accept-version' => '1.0,1.1,1.2',
    'heart-beat'     => join( ',', $cx, $cy ),
  );
  if ( defined $self->{login} ) {
    $cmd_headers{login} = $self->{login};
  }
  if ( defined $self->{passcode} ) {
    $cmd_headers{passcode} = $self->{passcode};
  }
  if ( defined $self->{vhost} ) {
    $cmd_headers{host} = $self->{vhost};
  }

  weaken($self);
  $self->{_login_state} = S_IN_PROGRESS;

  $self->_push_write(
    { name    => 'CONNECT',
      headers => \%cmd_headers,

      on_receipt => sub {
        my $receipt = shift;
        my $err     = shift;

        if ( defined $err ) {
          $self->{_login_state} = S_NEED_DO;
          $self->_abort($err);

          return;
        }

        $self->{_login_state} = S_DONE;

        my $receipt_headers = $receipt->headers;

        if ( defined $receipt_headers->{'heart-beat'} ) {
          my ( $sx, $sy ) = split( /,/, $receipt_headers->{'heart-beat'} );

          if ( $sx > 0 ) {
            $self->_rtimeout( max( $cy, $sx ) );
          }
          if ( $sy > 0 ) {

lib/AnyEvent/Stomper.pm  view on Meta::CPAN

}

sub _abort {
  my $self = shift;
  my $err  = shift;

  my @queued_commands = $self->_queued_commands;
  my %subs            = %{ $self->{_subs} };

  $self->{_input_queue}      = [];
  $self->{_temp_input_queue} = [];
  $self->{_write_queue}      = [];
  $self->{_temp_write_queue} = [];
  $self->{_pending_receipts} = {};
  $self->{_subs}             = {};

  if ( !defined $err && @queued_commands ) {
    $err = _new_error( 'Connection closed by client prematurely.',
        E_CONN_CLOSED_BY_CLIENT );
  }

  if ( defined $err ) {
    my $err_msg   = $err->message;
    my $err_code  = $err->code;
    my $err_frame = $err->frame;

    $self->{on_error}->($err);

    if ( %subs && $err_code != E_CONN_CLOSED_BY_CLIENT ) {
      foreach my $sub_id ( keys %subs ) {
        my $err = _new_error( qq{Subscription "$sub_id" lost: $err_msg},
            $err_code, $err_frame );

        my $sub = $subs{$sub_id};
        $sub->{on_receipt}->( undef, $err );
      }
    }

    foreach my $cmd (@queued_commands) {
      my $err = _new_error( qq{Operation "$cmd->{name}" aborted: $err_msg},
          $err_code, $err_frame );
      $cmd->{on_receipt}->( undef, $err );
    }
  }

  return;
}

sub _queued_commands {
  my $self = shift;

  return (
    values %{ $self->{_pending_receipts} },
    @{ $self->{_temp_write_queue} },
    @{ $self->{_write_queue} },
    @{ $self->{_temp_input_queue} },
    @{ $self->{_input_queue} },
  );
}

sub _escape {
  my $str = shift;

  $str =~ s/([\r\n:\\])/$ESCAPE_MAP{$1}/ge;

  return $str;
}

sub _unescape {
  my $str = shift;

  $str =~ s/(\\[rnc\\])/$UNESCAPE_MAP{$1}/ge;

  return $str;
}

sub _new_frame {
  return AnyEvent::Stomper::Frame->new(@_);
}

sub _new_error {
  return AnyEvent::Stomper::Error->new(@_);
}

sub DESTROY {
  my $self = shift;

  if ( defined $self->{_handle} ) {
    $self->{_handle}->destroy;
  }

  if ( defined $self->{_pending_receipts} ) {
    my @queued_commands = $self->_queued_commands;

    foreach my $cmd (@queued_commands) {
      warn qq{Operation "$cmd->{name}" aborted:}
          . " Client object destroyed prematurely.\n";
    }
  }

  return;
}

1;
__END__

=head1 NAME

AnyEvent::Stomper - Flexible non-blocking STOMP client

=head1 SYNOPSIS

  use AnyEvent;
  use AnyEvent::Stomper;

  my $stomper = AnyEvent::Stomper->new(
    host       => 'localhost',
    prot       => '61613',
    login      => 'guest',
    passcode   => 'guest',
  );

  my $cv = AE::cv;

  $stomper->subscribe(
    id          => 'foo',
    destination => '/queue/foo',

    on_receipt => sub {