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-rw-r--r--lib/facter/facter_dot_d.rb183
1 files changed, 183 insertions, 0 deletions
diff --git a/lib/facter/facter_dot_d.rb b/lib/facter/facter_dot_d.rb
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+++ b/lib/facter/facter_dot_d.rb
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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/facts.d").create
+Facter::Util::DotD.new("/etc/puppetlabs/facts.d").create