summaryrefslogtreecommitdiffstats
path: root/qooxdoo/source/perl/Qooxdoo/Services/Mtr.pm
blob: 6aead460826eb200a2d922e796a29ce64e816c01 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
package Qooxdoo::Services::Mtr;
use strict;
use POSIX qw(setsid :sys_wait_h);
use Time::HiRes qw(usleep);

sub GetAccessibility {
        return "public";
}

sub launch {
     my $error = shift;
     $SIG{CHLD} = \&REAPER;
     defined(my $pid = fork) or do { $error->set_error(101,"Can't fork: $!");return $error};
     if ($pid){
        open my $x, ">/tmp/mtr_session.$pid" or do {
            $error->set_error(199,"Opening /tmp/mtr_session.$$: $!");
            return $error;
        };
        close ($x);
        return $pid;
     }
     chdir '/'               or die "Can't chdir to /: $!";
     open STDOUT, ">>/tmp/mtr_session.$$"
                             or die "Can't write to /tmp/mtr_session.$$: $!";
     open STDIN, '/dev/null' or die "Can't read /dev/null: $!";
     setsid                  or die "Can't start a new session: $!";
     open STDERR, '>&STDOUT' or die "Can't dup stdout: $!";
     exec @_;
}

sub get_number {
    my $error = shift;
    my $data = shift;
    $data = 'Undefined' unless defined $data;
    if ($data =~ /^(\d+)$/){
        return $1;
    }
    else {
        $error->set_error(104,"Expected a number but got: $data");
        return $error;
    }
}

sub method_stop_mtr {
    my $error = shift;
    my $arg = shift; 
    my $handle = get_number($error,$arg);
    return $handle if ref $handle;
    my $data = "/tmp/mtr_session.".$handle;
    if (-r $data){
           warn "Sending kill $handle";
           kill('KILL',$handle);
    }            
}

sub method_run_mtr
{
    my $error = shift;
    my $arg = shift;
    my $handle = get_number($error,$arg->{handle});
    my $point = get_number($error,$arg->{point});
    if ($arg->{host}){
        my $delay = get_number($error,$arg->{delay});
        return $delay if ref $delay;
        my $rounds = get_number($error,$arg->{rounds});
        return $rounds if ref $rounds;
        $handle = launch ($error,"mtr","-4","--raw","--report-cycles=$rounds","--interval=$delay",$arg->{host});
        $point = 0;
    }
    return $point if ref $point;
    return $handle if ref $handle;
    my $data = "/tmp/mtr_session.".$handle;
    if (open my $fh,$data){
        my $again;
        my $size;
        my $rounds = 0;
        do {
            $size = -s $fh;
            # make sure we reap any zombi instances of mtr
            # this is especially important when running with speedy of fastcgi
            waitpid($handle,WNOHANG);
            $again = kill(0, $handle);
            usleep(1000*200) if $rounds;
#           print STDERR "$again, $handle, $size, $point\n";
            $rounds ++;
        } while ($again and $point >= $size);
        if (seek $fh, $point,0){
            my @array;
            while (<$fh>){
                if (not /^[a-z]\s/){
                    waitpid($handle,WNOHANG);
                    if (/Name or service not known/){
                        $error->set_error(108,"Unknown hostname.");
                        return $error;
                    }
                    else {
                        $error->set_error(107,"ERROR: $_. See $data for more information.");
                        return $error;
                    }
                }                        
                last unless /\n$/; # stop when we find an incomplete line
                $point = tell($fh);
                chomp;
                my @line = split (/\s+/,$_);
                push @array,\@line;
            };
            close $fh;
            unlink $data unless $again;
            return {
                handle=>$handle,
                point=>$point,
                output=>\@array,
                again=> $again,                                
            }
        }
        else {
            $error->set_error(102,"Seeking in mtr output to $point: $!");
            return $error;
        }            
    }
    else {
        $error->set_error(103,"Opening $data: $!");
        return $error;
    }
}

1;