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# GlusterFS module by James
# Copyright (C) 2010-2013+ James Shubin
# Written by James Shubin <james@shubin.ca>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
module Puppet::Parser::Functions
newfunction(:brick_layout_chained, :type => :rvalue, :doc => <<-'ENDHEREDOC') do |args|
Return the complex chained brick list
Example:
$layout = brick_layout_chained($replica, $bricks)
notice("layout is: ${layout}")
This function is used internally for automatic brick layouts.
ENDHEREDOC
Puppet::Parser::Functions.function('warning') # load function
Puppet::Parser::Functions.function('brick_str_to_hash') # load function
Puppet::Parser::Functions.function('get_hostlist') # load function
Puppet::Parser::Functions.function('get_brickstacks') # load function
# signature: replica, bricks -> bricks
unless args.length == 2
raise Puppet::ParseError, "brick_layout_chained(): wrong number of arguments (#{args.length}; must be 2)"
end
if not(args[0].is_a?(Integer)) and not(args[0].is_a?(String))
# NOTE: strings that convert to int's with .to_i are ok
raise Puppet::ParseError, "brick_layout_chained(): expects the first argument to be an integer, got #{args[0].inspect} which is of type #{args[0].class}"
end
unless args[1].is_a?(Array)
raise Puppet::ParseError, "brick_layout_chained(): expects the second argument to be an array, got #{args[1].inspect} which is of type #{args[1].class}"
end
replica = args[0].to_i # convert from string if needed
bricks = args[1]
final = []
pointer = 0
parsed = function_brick_str_to_hash([bricks])
# TODO: there should probably be a proper 'sorted' function for
# hostnames, in case they aren't numbered sanely _WITH_ padding.
hosts = function_get_hostlist([parsed]).sort
brickstack = function_get_brickstacks([parsed, true])
if bricks.length == 0; return []; end
# FIXME: this works with homogeneous volumes only!
while pointer < (hosts.length * brickstack[hosts[0]].length) do
start = hosts[pointer % hosts.length]
#puts "host is #{host}, pointer is: #{pointer}"
index = 0
while index < replica do
host = hosts[(pointer+index) % hosts.length]
#puts "host is #{host}, index is: #{index}"
index+= 1
path = brickstack[host].shift # yoink
if path.nil?
function_warning(["brick_layout_chained(): brick list is not valid"])
next
end
final.push({'host' => host, 'path' => path}) # save
end
pointer+=1
end
# build final result
result = final.collect {|x| x['host']+':'+x['path'] }
result # return
end
end
# vim: ts=8
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