NAME

Rex::Transaction - Transaction support.

DESCRIPTION

With this module you can define transactions and rollback szenarios on failure.

SYNOPSIS

 task "do-something", "server01", sub {
  on_rollback {
    rmdir "/tmp/mydata";
  };
 
  transaction {
    mkdir "/tmp/mydata";
    upload "files/myapp.tar.gz", "/tmp/mydata";
    run "cd /tmp/mydata; tar xzf myapp.tar.gz";
    if($? != 0) { die("Error extracting myapp.tar.gz"); }
  };
 };

EXPORTED FUNCTIONS

transaction($codeRef)

Start a transaction for $codeRef. If $codeRef dies it will rollback the transaction.

 task "deploy", group => "frontend", sub {
    on_rollback {
      rmdir "...";
    };
    deploy "myapp.tar.gz";
 };
  
 task "restart_server", group => "frontend", sub {
    run "/etc/init.d/apache2 restart";
 };
  
 task "all", group => "frontend", sub {
    transaction {
      do_task [qw/deploy restart_server/];
    };
 };

on_rollback($codeRef)

This code will be executed if one step in the transaction fails.

See transaction.