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|
# A Facter plugin that loads facts from /etc/facts.d.
#
# Facts can be in the form of JSON, YAML or Text files
# and any executable that returns key=value pairs.
#
# In the case of scripts you can also create a file that
# contains a cache TTL. For foo.sh store the ttl as just
# a number in foo.sh.ttl
#
# The cache is stored in /tmp/facts_cache.yaml as a mode
# 600 file and will have the end result of not calling your
# fact scripts more often than is needed
class Facter::Util::DotD
require 'yaml'
def initialize(dir="/etc/facts.d", cache_file="/tmp/facts_cache.yml")
@dir = dir
@cache_file = cache_file
@cache = nil
@types = {".txt" => :txt, ".json" => :json, ".yaml" => :yaml}
end
def entries
Dir.entries(@dir).reject{|f| f =~ /^\.|\.ttl$/}.sort.map {|f| File.join(@dir, f) }
rescue
[]
end
def fact_type(file)
extension = File.extname(file)
type = @types[extension] || :unknown
type = :script if type == :unknown && File.executable?(file)
return type
end
def txt_parser(file)
File.readlines(file).each do |line|
if line =~ /^(.+)=(.+)$/
var = $1; val = $2
Facter.add(var) do
setcode { val }
end
end
end
rescue Exception => e
Facter.warn("Failed to handle #{file} as text facts: #{e.class}: #{e}")
end
def json_parser(file)
begin
require 'json'
rescue LoadError
require 'rubygems'
retry
end
JSON.load(File.read(file)).each_pair do |f, v|
Facter.add(f) do
setcode { v }
end
end
rescue Exception => e
Facter.warn("Failed to handle #{file} as json facts: #{e.class}: #{e}")
end
def yaml_parser(file)
require 'yaml'
YAML.load_file(file).each_pair do |f, v|
Facter.add(f) do
setcode { v }
end
end
rescue Exception => e
Facter.warn("Failed to handle #{file} as yaml facts: #{e.class}: #{e}")
end
def script_parser(file)
result = cache_lookup(file)
ttl = cache_time(file)
unless result
result = Facter::Util::Resolution.exec(file)
if ttl > 0
Facter.debug("Updating cache for #{file}")
cache_store(file, result)
cache_save!
end
else
Facter.debug("Using cached data for #{file}")
end
result.split("\n").each do |line|
if line =~ /^(.+)=(.+)$/
var = $1; val = $2
Facter.add(var) do
setcode { val }
end
end
end
rescue Exception => e
Facter.warn("Failed to handle #{file} as script facts: #{e.class}: #{e}")
Facter.debug(e.backtrace.join("\n\t"))
end
def cache_save!
cache = load_cache
File.open(@cache_file, "w", 0600) {|f| f.write(YAML.dump(cache)) }
rescue
end
def cache_store(file, data)
load_cache
@cache[file] = {:data => data, :stored => Time.now.to_i}
rescue
end
def cache_lookup(file)
cache = load_cache
return nil if cache.empty?
ttl = cache_time(file)
if cache[file]
now = Time.now.to_i
return cache[file][:data] if ttl == -1
return cache[file][:data] if (now - cache[file][:stored]) <= ttl
return nil
else
return nil
end
rescue
return nil
end
def cache_time(file)
meta = file + ".ttl"
return File.read(meta).chomp.to_i
rescue
return 0
end
def load_cache
unless @cache
if File.exist?(@cache_file)
@cache = YAML.load_file(@cache_file)
else
@cache = {}
end
end
return @cache
rescue
@cache = {}
return @cache
end
def create
entries.each do |fact|
type = fact_type(fact)
parser = "#{type}_parser"
if respond_to?("#{type}_parser")
Facter.debug("Parsing #{fact} using #{parser}")
send(parser, fact)
end
end
end
end
Facter::Util::DotD.new("/etc/facter/facts.d").create
Facter::Util::DotD.new("/etc/puppetlabs/facter/facts.d").create
|
