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stmt |
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=head1 NAME |
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3
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WWW::Crab::Client - Crab client library |
4
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5
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=head1 SYNOPSIS |
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7
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use WWW::Crab::Client; |
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9
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my $crab = new WWW::Crab::Client(); |
10
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11
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eval { |
12
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$crab->start(); |
13
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}; |
14
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15
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# Perform the cron job actions ... |
16
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17
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my $finished_ok = eval { |
18
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$crab->finish(status => WWW::Crab::Client::SUCCESS, stdout => $message); |
19
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}; |
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unless ($finished_ok) { |
21
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print "Failed to report job completion.\n" . $@ . "\n" . $message; |
22
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} |
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24
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=head1 DESCRIPTION |
25
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26
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This module implements a subset of the Crab protocol sufficient |
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for reporting the status of a cron job to the Crab server. |
28
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It is intended to work similarly to the Python Crab client module, |
29
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but be more convient for cron jobs written in Perl. |
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31
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=cut |
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33
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package WWW::Crab::Client; |
34
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35
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1
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1
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944
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use strict; |
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1
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2
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1
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45
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36
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37
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1
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1
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1367
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use Config::IniFiles; |
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1
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149854
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1
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41
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38
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1
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1
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104681
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use File::HomeDir; |
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1
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37252
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1
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111
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39
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1
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1
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10
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use File::Spec; |
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1
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1
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1
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22
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40
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1
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1
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983
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use HTTP::Request; |
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1
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37997
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1
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52
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41
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1
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1
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12
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use JSON; |
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1
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41
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1
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11
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42
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1
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1
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4224
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use LWP::UserAgent; |
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1
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46912
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1
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55
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43
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1
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1
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1094
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use Sys::Hostname; |
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1
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1514
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1
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100
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44
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45
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our $VERSION = 0.06; |
46
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47
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use constant { |
48
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1
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980
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SUCCESS => 0, |
49
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FAIL => 1, |
50
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UNKNOWN => 2, |
51
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COULDNOTSTART => 3, |
52
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ALREADYRUNNING=> 4, |
53
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WARNING => 5, |
54
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1
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1
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7
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}; |
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1
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2
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55
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56
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=head1 CONSTRUCTOR |
57
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58
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=over 4 |
59
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60
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=item new() |
61
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62
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Constructs a new client object. All parameters are optional. |
63
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If no job identifier is given, then a null value is sent to |
64
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the server. If the command is unspecified, C<$0> will be used. |
65
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No communication is performed until the L or L |
66
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methods are called. |
67
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68
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my $crab = new WWW::Crab::Client(id => 'job identifier', |
69
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command => 'command name', |
70
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server => 'localhost', |
71
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port => 8000, |
72
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hostname => 'localhost', |
73
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username => 'username', |
74
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timeout => 30); |
75
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76
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|
If the other settings are not specified, the crab settings files |
77
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|
will be read, the CRABHOST and CRABPORT environment variables will |
78
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|
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|
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|
|
be checked, or defaults will be used. |
79
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|
80
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|
|
=cut |
81
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82
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sub new { |
83
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1
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1
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1
|
1108
|
my $class = shift; |
84
|
1
|
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2
|
my %opt = @_; |
85
|
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|
86
|
1
|
|
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|
|
12
|
my $conf = new Config::IniFiles(-file => \'', -allowempty => 1); |
87
|
1
|
|
50
|
|
|
23148
|
my $conf_system = File::Spec->catfile($ENV{'CRABSYSCONFIG'} || '/etc/crab', |
88
|
|
|
|
|
|
|
'crab.ini'); |
89
|
1
|
|
33
|
|
|
76
|
my $conf_user = File::Spec->catfile($ENV{'CRABUSERCONFIG'} || |
90
|
|
|
|
|
|
|
(File::HomeDir->my_home() . '/.crab'), |
91
|
|
|
|
|
|
|
'crab.ini'); |
92
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1
|
50
|
|
|
|
107
|
$conf = new Config::IniFiles(-file => $conf_system, '-import' => $conf, |
93
|
|
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|
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|
|
-allowempty => 1) |
94
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|
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|
|
if (-e $conf_system); |
95
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|
96
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1
|
50
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12
|
$conf = new Config::IniFiles(-file => $conf_user, '-import' => $conf, |
97
|
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|
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|
|
-allowempty => 1) |
98
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|
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|
|
if (-e $conf_user); |
99
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|
|
100
|
1
|
|
50
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|
25
|
my $self = { |
|
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33
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33
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33
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33
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33
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33
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101
|
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|
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|
|
id => $opt{'id'} || undef, |
102
|
|
|
|
|
|
|
command => $opt{'command'} || $0, |
103
|
|
|
|
|
|
|
server => $opt{'server'} || $ENV{'CRABHOST'} || |
104
|
|
|
|
|
|
|
$conf->val('server', 'host', 'localhost'), |
105
|
|
|
|
|
|
|
port => $opt{'port'} || $ENV{'CRABPORT'} || |
106
|
|
|
|
|
|
|
$conf->val('server', 'port', 8000), |
107
|
|
|
|
|
|
|
hostname => $opt{'hostname'} || $conf->val('client', 'hostname', |
108
|
|
|
|
|
|
|
hostname()), |
109
|
|
|
|
|
|
|
username => $opt{'username'} || $conf->val('client', 'username', |
110
|
|
|
|
|
|
|
_get_username()), |
111
|
|
|
|
|
|
|
timeout => $opt{'timeout'} || $conf->val('server', 'timeout', 30), |
112
|
|
|
|
|
|
|
}; |
113
|
|
|
|
|
|
|
|
114
|
1
|
|
|
|
|
72
|
return bless $self, $class; |
115
|
|
|
|
|
|
|
} |
116
|
|
|
|
|
|
|
|
117
|
|
|
|
|
|
|
=back |
118
|
|
|
|
|
|
|
|
119
|
|
|
|
|
|
|
=head1 METHODS |
120
|
|
|
|
|
|
|
|
121
|
|
|
|
|
|
|
=over 4 |
122
|
|
|
|
|
|
|
|
123
|
|
|
|
|
|
|
=item start() |
124
|
|
|
|
|
|
|
|
125
|
|
|
|
|
|
|
Reports that the job has started. |
126
|
|
|
|
|
|
|
|
127
|
|
|
|
|
|
|
$crab->start(); |
128
|
|
|
|
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|
|
|
129
|
|
|
|
|
|
|
This method uses "die" to raise an exception if it is unsuccessful |
130
|
|
|
|
|
|
|
in reporting to the Crab server. |
131
|
|
|
|
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|
|
|
132
|
|
|
|
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|
|
Returns a true value on success. |
133
|
|
|
|
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|
|
134
|
|
|
|
|
|
|
=cut |
135
|
|
|
|
|
|
|
|
136
|
|
|
|
|
|
|
sub start { |
137
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
138
|
|
|
|
|
|
|
|
139
|
0
|
|
|
|
|
0
|
return $self->_write_json($self->_get_url('start'), { |
140
|
|
|
|
|
|
|
command => $self->{'command'}}); |
141
|
|
|
|
|
|
|
} |
142
|
|
|
|
|
|
|
|
143
|
|
|
|
|
|
|
=item finish() |
144
|
|
|
|
|
|
|
|
145
|
|
|
|
|
|
|
Reports that the job has finished. If the status is not specified, |
146
|
|
|
|
|
|
|
UNKNOWN will be sent. |
147
|
|
|
|
|
|
|
|
148
|
|
|
|
|
|
|
$crab->finish(status => WWW::Crab::Client::SUCCESS, |
149
|
|
|
|
|
|
|
stdout => $command_output, |
150
|
|
|
|
|
|
|
stderr => $error_message); |
151
|
|
|
|
|
|
|
|
152
|
|
|
|
|
|
|
The following constants are defined in this module, and should be used |
153
|
|
|
|
|
|
|
to obtain the appropriate Crab status codes: |
154
|
|
|
|
|
|
|
|
155
|
|
|
|
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|
|
SUCCESS |
156
|
|
|
|
|
|
|
FAIL |
157
|
|
|
|
|
|
|
UNKNOWN |
158
|
|
|
|
|
|
|
COULDNOTSTART |
159
|
|
|
|
|
|
|
ALREADYRUNNING |
160
|
|
|
|
|
|
|
WARNING |
161
|
|
|
|
|
|
|
|
162
|
|
|
|
|
|
|
This method uses "die" to raise an exception if it is unsuccessful |
163
|
|
|
|
|
|
|
in reporting to the Crab server. |
164
|
|
|
|
|
|
|
|
165
|
|
|
|
|
|
|
Returns a true value on success. |
166
|
|
|
|
|
|
|
|
167
|
|
|
|
|
|
|
=cut |
168
|
|
|
|
|
|
|
|
169
|
|
|
|
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|
|
sub finish { |
170
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
171
|
0
|
|
|
|
|
0
|
my %opt = @_; |
172
|
|
|
|
|
|
|
|
173
|
0
|
0
|
0
|
|
|
0
|
return $self->_write_json($self->_get_url('finish'), { |
|
|
|
0
|
|
|
|
|
174
|
|
|
|
|
|
|
command => $self->{'command'}, |
175
|
|
|
|
|
|
|
status => defined $opt{'status'} ? $opt{'status'} : UNKNOWN, |
176
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|
|
|
|
|
|
stdout => $opt{'stdout'} || '', |
177
|
|
|
|
|
|
|
stderr => $opt{'stderr'} || ''}); |
178
|
|
|
|
|
|
|
} |
179
|
|
|
|
|
|
|
|
180
|
|
|
|
|
|
|
# _write_json() |
181
|
|
|
|
|
|
|
# |
182
|
|
|
|
|
|
|
# Sends the given object to the Crab server as a JSON message. |
183
|
|
|
|
|
|
|
# |
184
|
|
|
|
|
|
|
# $self->_write_json($self->_get_url($ACTION), $HASHREF); |
185
|
|
|
|
|
|
|
# |
186
|
|
|
|
|
|
|
# Dies on failure, and returns 1 on success. Could be improved |
187
|
|
|
|
|
|
|
# to return a useful value on success, so long as it is 'true'. |
188
|
|
|
|
|
|
|
|
189
|
|
|
|
|
|
|
sub _write_json { |
190
|
0
|
|
|
0
|
|
0
|
my $self = shift; |
191
|
0
|
|
|
|
|
0
|
my $url = shift; |
192
|
0
|
|
|
|
|
0
|
my $obj = shift; |
193
|
|
|
|
|
|
|
|
194
|
0
|
|
|
|
|
0
|
my $ua = new LWP::UserAgent(timeout => $self->{'timeout'}); |
195
|
0
|
|
|
|
|
0
|
my $req = new HTTP::Request(PUT => $url); |
196
|
0
|
|
|
|
|
0
|
$req->content(encode_json($obj)); |
197
|
0
|
|
|
|
|
0
|
my $res = $ua->request($req); |
198
|
0
|
0
|
|
|
|
0
|
die $res->status_line() unless $res->is_success(); |
199
|
0
|
|
|
|
|
0
|
return 1; |
200
|
|
|
|
|
|
|
} |
201
|
|
|
|
|
|
|
|
202
|
|
|
|
|
|
|
# _get_url() |
203
|
|
|
|
|
|
|
# |
204
|
|
|
|
|
|
|
# Returns the URL to be used for a given Crab aaction. |
205
|
|
|
|
|
|
|
# |
206
|
|
|
|
|
|
|
# my $url = $self->_get_url($ACTION); |
207
|
|
|
|
|
|
|
# |
208
|
|
|
|
|
|
|
# Where the action is typically 'start' or 'finish'. |
209
|
|
|
|
|
|
|
|
210
|
|
|
|
|
|
|
sub _get_url { |
211
|
0
|
|
|
0
|
|
0
|
my $self = shift; |
212
|
0
|
|
|
|
|
0
|
my $action = shift; |
213
|
|
|
|
|
|
|
|
214
|
0
|
|
|
|
|
0
|
my @path = ($self->{'hostname'}, $self->{'username'}); |
215
|
0
|
0
|
|
|
|
0
|
push @path, $self->{'id'} if defined $self->{'id'}; |
216
|
|
|
|
|
|
|
|
217
|
0
|
|
|
|
|
0
|
return 'http://' . $self->{'server'} . ':' . $self->{'port'} . '/' . |
218
|
|
|
|
|
|
|
join('/', 'api', '0', $action, @path); |
219
|
|
|
|
|
|
|
} |
220
|
|
|
|
|
|
|
|
221
|
|
|
|
|
|
|
# _get_username() |
222
|
|
|
|
|
|
|
# |
223
|
|
|
|
|
|
|
# Detects the username of the current user. |
224
|
|
|
|
|
|
|
# |
225
|
|
|
|
|
|
|
# This provides the default value for the username parameter |
226
|
|
|
|
|
|
|
# of the WWW::Crab::Client constructor. |
227
|
|
|
|
|
|
|
|
228
|
|
|
|
|
|
|
sub _get_username { |
229
|
1
|
|
|
1
|
|
1190
|
my $username = undef; |
230
|
|
|
|
|
|
|
|
231
|
1
|
|
|
|
|
3
|
eval { |
232
|
1
|
|
|
|
|
1136
|
$username = scalar getpwuid($<); |
233
|
|
|
|
|
|
|
}; |
234
|
|
|
|
|
|
|
|
235
|
1
|
50
|
|
|
|
12
|
return $username if defined $username; |
236
|
|
|
|
|
|
|
|
237
|
0
|
|
|
|
|
|
eval { |
238
|
0
|
|
|
|
|
|
require Win32; |
239
|
0
|
|
|
|
|
|
$username = Win32::LoginName(); |
240
|
|
|
|
|
|
|
}; |
241
|
|
|
|
|
|
|
|
242
|
0
|
0
|
|
|
|
|
return $username if defined $username; |
243
|
|
|
|
|
|
|
|
244
|
0
|
|
|
|
|
|
return 'user'; |
245
|
|
|
|
|
|
|
} |
246
|
|
|
|
|
|
|
|
247
|
|
|
|
|
|
|
1; |
248
|
|
|
|
|
|
|
|
249
|
|
|
|
|
|
|
__END__ |