############################################################
#
#  Chinese Dragon Dancing on a Star
#
#  This method works with either Community or Enterprise.
#  and uses named signals
#
#  If you want to test this on localhost, just edit /etc/hosts
#  to add host1 host2 host3 host4 as aliases to localhost
#
############################################################

body common control
{
bundlesequence => { "dragon_symphony" };
inputs => { "libraries/cfengine_stdlib.cf" };
}

############################################################

bundle agent dragon_symphony
{
methods:

   # We have to seed the beginning by creating the dragon
   # /tmp/dragon_localhost

    "dragon"  usebundle => visit("localhost","host1","chapter1");

    "dragon"  usebundle => visit("host1","host2","chapter2");

    "dragon"  usebundle => visit("host2","host3","chapter3");

    "dragon"  usebundle => visit("host3","host4","chapter4"),
                classes => if_ok("finale");

reports:

  finale::

    "The dragon is slain:"
       printfile => visitors_book("/tmp/shoo_dragon_host4");
}

############################################################
# Define the 
############################################################

bundle agent chapter1(x)
{
# Do something significant here

reports:

 host1::
    " ----> Breathing fire on $(x)";
}

################################

bundle agent chapter2(x)
{
# Do something significant here

reports:

 host2::
    " ----> Breathing fire on $(x)";

}

################################

bundle agent chapter3(x)
{
# Do something significant here

reports:

 host3::
    " ----> Breathing fire on $(x)";

}

################################

bundle agent chapter4(x)
{
# Do something significant here

reports:

 host4::
    " ----> Breathing fire on $(x)";

}

############################################################
# Orchestration wrappers
############################################################

bundle agent visit(predecessor,satellite,method)
{

 # This is a wrapper for the orchestration will be acted on
 # first by the dragon's lair and then by the satellite

vars:

  "dragons_lair" string => "host0";

files:

  # We start in the dragon's lair ..

  "/tmp/unleash_dragon"

        comment => "Unleash the dragon",
      rename => to("/tmp/enter_the_dragon"),
        classes => if_repaired("dispatch_dragon_$(satellite)"),
     ifvarclass => "$(dragons_lair)";

  # if we are the dragon's lair, welcome the dragon back, shooed from the satellite

  "/tmp/enter_the_dragon"

        comment => "Returning from a visit to a satellite",
      copy_from => secure_cp("/tmp/shoo_dragon_$(predecessor)","$(predecessor)"),
        classes => if_repaired("dispatch_dragon_$(satellite)"),
     ifvarclass => "$(dragons_lair)";

  # If we are a satellite, receive the dragon from its lair

  "/tmp/enter_the_dragon"
        comment => "Wait for our cue or relay/conductor baton",
      copy_from => secure_cp("/tmp/dragon_$(satellite)","$(dragons_lair)"),
        classes => if_repaired("cue_action_on_$(satellite)"),
     ifvarclass => "$(satellite)";

methods:

   "check in at home"
        comment => "Edit the load balancer?",
      usebundle => switch_satellite(" -> Send dragon to $(satellite)"),
        classes => if_repaired("send_the_dragon_to_$(satellite)"),
     ifvarclass => "dispatch_dragon_$(satellite)";

   "dragon visits"
        comment => "One off activity that the nodes carry out while the dragon visits",
      usebundle => $(method)("$(satellite)"),
        classes => if_repaired("send_the_dragon_back_from_$(satellite)"),
     ifvarclass => "cue_action_on_$(satellite)";


files:

  # hub/lair hub signs the book too and schedules the dragon for next satellite

   "/tmp/dragon_$(satellite)"   
         create => "true",
        comment => "Add our signature to the dragon's tail",
      edit_line => sign_visitor_book("Dragon returned from $(predecessor)"),
     ifvarclass => "send_the_dragon_to_$(satellite)";

   # Satellite signs the book and shoos dragon for hub to collect

   "/tmp/shoo_dragon_$(satellite)"
         create => "true",
        comment => "Add our signature to the dragon's tail",
      edit_line => sign_visitor_book("Dragon visited $(satellite) and did: $(method)"),
     ifvarclass => "send_the_dragon_back_from_$(satellite)";

reports:

  !xyz::

    "Done $(satellite)";

}

############################################################

bundle agent switch_satellite(name)
{
files:

   "/tmp/enter_the_dragon"
        comment => "Add our signature to the dragon's tail",
      edit_line => append_if_no_line("Switch new dragon's target $(name)");

reports:

  !xyz::
   " X Switching new dragon's target $(name)";
}


############################################################

bundle edit_line sign_visitor_book(s)
{
insert_lines:

  "/tmp/enter_the_dragon"
        comment => "Import the current visitor's book",
    insert_type => "file";

  "$(s)" comment => "Append this string to the visitor's book";
}

############################################################


bundle server access_rules()
{
access:

  "/tmp"

        admit => { "127.0.0.1" };

  "did.*"
    resource_type => "context",
    admit => { "127.0.0.1" };

}

############################################################

body printfile visitors_book(file)
{
file_to_print   => "$(file)";
number_of_lines => "100";
}


