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
129
130
131
132
133
|
#
# (c) Jan Gehring <jan.gehring@gmail.com>
#
=head1 NAME
Rex::Transaction - Transaction support
=head1 DESCRIPTION
With this module you can define transactions and rollback scenarios on failure.
=head1 SYNOPSIS
use Rex::Transaction;
task 'do-something', 'server01', sub {
transaction {
on_rollback {
rmdir '/tmp/mydata';
};
mkdir '/tmp/mydata';
upload 'files/myapp.tar.gz', '/tmp/mydata';
run 'tar xzf myapp.tar.gz -C /tmp/mydata';
if ( $? != 0 ) { die('Error extracting myapp.tar.gz'); }
};
};
=head1 EXPORTED FUNCTIONS
=cut
package Rex::Transaction;
use v5.12.5;
use warnings;
our $VERSION = '1.14.1'; # VERSION
require Exporter;
use vars qw(@EXPORT @ROLLBACKS);
use base qw(Exporter);
use Rex::Logger;
use Rex::TaskList;
use Data::Dumper;
@EXPORT = qw(transaction on_rollback);
=head2 transaction($codeRef)
Start a transaction for C<$codeRef>. If C<$codeRef> dies, Rex will run the L<on_rollback|https://metacpan.org/pod/Rex::Transaction#on_rollback> code to roll back the transaction.
task 'deploy', group => 'frontend', sub {
on_rollback {
rmdir '...';
};
deploy 'myapp.tar.gz';
};
task 'restart_server', group => 'frontend', sub {
service apache2 => 'restart';
};
task 'all', group => 'frontend', sub {
transaction {
do_task [qw/deploy restart_server/];
};
};
=cut
sub transaction(&) {
my ($code) = @_;
my $ret = 1;
Rex::Logger::debug("Cleaning ROLLBACKS array");
@ROLLBACKS = ();
Rex::TaskList->create()->set_in_transaction(1);
eval { &$code(); };
if ($@) {
my $err = $@;
Rex::Logger::info("Transaction failed. Rolling back.");
$ret = 0;
for my $rollback_code ( reverse @ROLLBACKS ) {
# push the connection of the task back
Rex::push_connection( $rollback_code->{"connection"} );
# run the rollback code
&{ $rollback_code->{"code"} }($err);
# and pop it away
Rex::pop_connection();
}
Rex::TaskList->create()->set_in_transaction(0);
die("Transaction failed. Rollback done.");
}
Rex::TaskList->create()->set_in_transaction(0);
return $ret;
}
=head2 on_rollback($codeRef)
This will execute C<$codeRef> if a step in the L<transaction|https://metacpan.org/pod/Rex::Transaction#transaction> fails.
=cut
sub on_rollback(&) {
my ($code) = @_;
push(
@ROLLBACKS,
{
code => $code,
connection => Rex::get_current_connection()
}
);
}
1;
|
