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|
#
# Author:: Adam Jacob (<adam@opscode.com>)
# Author:: Daniel DeLeo (<dan@kallistec.com>)
# Copyright:: Copyright (c) 2009 Opscode, Inc.
# Copyright:: Copyright (c) 2009 Daniel DeLeo
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require 'set'
require 'fileutils'
require 'chef/log'
require 'chef/config'
require 'chef/client'
require 'chef/mixin/convert_to_class_name'
require 'singleton'
require 'moneta'
class Chef
class ChecksumCache
include Chef::Mixin::ConvertToClassName
include ::Singleton
attr_reader :moneta
def initialize(*args)
self.reset!(*args)
end
def reset!(backend=nil, options=nil)
backend ||= Chef::Config[:cache_type]
options ||= Chef::Config[:cache_options]
begin
require "moneta/#{convert_to_snake_case(backend, 'Moneta')}"
require 'chef/monkey_patches/moneta'
rescue LoadError => e
Chef::Log.fatal("Could not load Moneta back end #{backend.inspect}")
raise e
end
@moneta = Moneta.const_get(backend).new(options)
end
def self.reset_cache_validity
@valid_cached_checksums = nil
end
Chef::Client.when_run_starts do |run_status|
reset_cache_validity
end
def self.valid_cached_checksums
@valid_cached_checksums ||= Set.new
end
def self.validate_checksum(checksum_key)
valid_cached_checksums << checksum_key
end
def self.all_cached_checksums
all_checksums_with_filenames = {}
Dir[File.join(Chef::Config[:cache_options][:path], '*')].each do |cksum_file|
all_checksums_with_filenames[File.basename(cksum_file)] = cksum_file
end
all_checksums_with_filenames
end
def self.cleanup_checksum_cache
Chef::Log.debug("Cleaning the checksum cache")
if (Chef::Config[:cache_type].to_s == "BasicFile")
all_cached_checksums.each do |cache_key, cksum_cache_file|
unless valid_cached_checksums.include?(cache_key)
remove_unused_checksum(cksum_cache_file)
end
end
end
end
Chef::Client.when_run_completes_successfully do |run_status|
cleanup_checksum_cache
end
def self.remove_unused_checksum(checksum_file)
Chef::Log.debug("Removing unused checksum cache file #{checksum_file}")
FileUtils.rm(checksum_file)
end
def self.checksum_for_file(*args)
instance.checksum_for_file(*args)
end
def validate_checksum(*args)
self.class.validate_checksum(*args)
end
def checksum_for_file(file, key=nil)
key ||= generate_key(file)
fstat = File.stat(file)
lookup_checksum(key, fstat) || generate_checksum(key, file, fstat)
end
def lookup_checksum(key, fstat)
cached = fetch(key)
if cached && file_unchanged?(cached, fstat)
validate_checksum(key)
cached["checksum"]
else
nil
end
end
def generate_checksum(key, file, fstat)
checksum = checksum_file(file, Digest::SHA256.new)
moneta.store(key, {"mtime" => fstat.mtime.to_f, "checksum" => checksum})
validate_checksum(key)
checksum
end
def generate_key(file, group="chef")
"#{group}-file-#{file.gsub(/(#{File::SEPARATOR}|\.)/, '-')}"
end
def self.generate_md5_checksum_for_file(*args)
instance.generate_md5_checksum_for_file(*args)
end
def generate_md5_checksum_for_file(file)
checksum_file(file, Digest::MD5.new)
end
def generate_md5_checksum(io)
checksum_io(io, Digest::MD5.new)
end
private
def fetch(key)
@moneta.fetch(key)
rescue ArgumentError => e
Log.warn "Error loading cached checksum for key #{key.inspect}"
Log.warn(e)
repair_checksum_cache
nil
end
def repair_checksum_cache
Chef::Log.info("Removing invalid checksum cache files")
Dir["#{Chef::Config[:cache_options][:path]}/*"].each do |file_path|
File.unlink(file_path) unless File.size?(file_path)
end
end
def file_unchanged?(cached, fstat)
cached["mtime"].to_f == fstat.mtime.to_f
end
def checksum_file(file, digest)
File.open(file, 'rb') { |f| checksum_io(f, digest) }
end
def checksum_io(io, digest)
while chunk = io.read(1024 * 8)
digest.update(chunk)
end
digest.hexdigest
end
end
end
module Moneta
module Defaults
def default
nil
end
end
end
|
