#
# Make list of hosts available to all clients, and use it on clients
# in order to configure a sample monitoring application that checks 
# health of all clients.
#
# Sample application configuration file contents below, put this in 
# /var/cfengine/masterfiles/template_monitoring on the hub.
#
# ---
#
#monitor_hosts = $(orchestration_hostlist_use.host_string)
#
# ---
#
# Note that your copy_from statement in failsafe.cf or update.cf must
# copy this file also (e.g. not only copy *.cf files in any file_select)



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


bundle agent orchestration_hostlist_update
{
vars:
  am_policy_hub::
    "host_list" slist => hostsseen("inf", "lastseen", "address");

files:

  am_policy_hub::
    "$(sys.workdir)/masterfiles/host_list"
       comment       => "Write the addresses of all hosts to a file",
       handle        => "orchestration_hostlit_update_files_host_list_write",
       edit_line     => insert_lines( "@(orchestration_hostlist_update.host_list)" ),
       create        => "true",
       edit_defaults => empty;
}


bundle agent orchestration_hostlist_use
{
vars:
    "host_list"    slist => readstringlist("$(sys.workdir)/inputs/host_list", "#.*", "\n", 1000, 40000);
    "host_string" string => join(", ", "host_list");

files:
    "/tmp/monitoring"
       comment       => "Update application configuration to reflect all hosts on this hub",
       handle        => "orchestration_read_files_host_list_configuration",
       edit_line     => expand_template("$(sys.workdir)/inputs/template_monitoring"),
       create        => "true",
       edit_defaults => empty;
}
