在Perl中返回哈希数组

Question

The below function logins into a router, executes a command to get the IPsec session status and returns the interface name and ip address as string. Instead of returning a string, I want the function to return array of hashes. Can someone help me out with that ?

sub cryptoSessionStatus {
    my ($self,$interface)  = @_;
    my $status  = 0;
    my $peer_ip = 0;

    #command to check the tunnel status
    my $cmd     = 'command goes here ' . $interface;
    #$self->_login();
    my $tunnel_status = $self->_login->exec($cmd);

    #Regex to match the 'tunnel status' and 'peer ip' string in the cmd output
    #Session status: DOWN/UP
    #Peer: x.x.x.x
    foreach my $line (  $tunnel_status ) {
      if ( $line =~ m/Session\s+status:\s+(.*)/ ) {
            $status = $1;
      }
      if ( $line =~ m/Peer:\s+(\d+.\d+.\d+.\d+)/ ) {
            $peer_ip = $1;
      }
    }

    return ($status,$peer_ip);
}

Function call:

 my $tunnel_obj =  test::Cryptotunnels->new('host'=> 'ip');

my $crypto_sessions = $tunnel_obj->cryptoSessionStatus("tunnel1");

Answer 1

This should do it:

my @session_states;
my $status;
foreach my $line (  $tunnel_status ) {
    if ( $line =~ m/Session\s+status:\s+(.*)/ ) {
        $status = $1;
    }
    if ( $line =~ m/Peer:\s+(\d+.\d+.\d+.\d+)/ ) {
        push @session_states, { ip => $1 , status => $status };
        $status = ""
    }
}
return \@session_states;
#
# called like so
#
my $tunnel_obj =  test::Cryptotunnels->new('host'=> 'ip');
my $crypto_sessions = $tunnel_obj->cryptoSessionStatus("tunnel1");
for my $obj (@$crypto_sessions) {
    print $obj->{ip}, "\n";
    print $obj->{status}, "\n";
}

This assumes the Session status line appears before the Peer line in the output. If its the other way around (you didn't supply a sample of what the router output looks like, so I have to guess a bit...) ie: if the Peer line is before the Session status line then it should be like this:

my @session_states;
my $peer_ip;
foreach my $line (  $tunnel_status ) {
    if ( $line =~ m/Session\s+status:\s+(.*)/ ) {
        push @session_states, { ip => $peer_ip , status => $1 };
        $peer_ip = "";
    }
    if ( $line =~ m/Peer:\s+(\d+.\d+.\d+.\d+)/ ) {
        $peer_ip = $1;
    }
}
return \@session_states;
#
# called the same as above
#

There's no real difference in the algorithm - whichever comes second in the output - Peer or Session status - defines the end of the entry and a hash is created with the two entries and pushed onto the @session_states array.