/usr/lib/ruby/vendor_ruby/active_support/cache/file_store.rb is in ruby-activesupport-3.2 3.2.16-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 | require 'active_support/core_ext/file/atomic'
require 'active_support/core_ext/string/conversions'
require 'active_support/core_ext/object/inclusion'
require 'rack/utils'
module ActiveSupport
module Cache
# A cache store implementation which stores everything on the filesystem.
#
# FileStore implements the Strategy::LocalCache strategy which implements
# an in-memory cache inside of a block.
class FileStore < Store
attr_reader :cache_path
DIR_FORMATTER = "%03X"
FILENAME_MAX_SIZE = 230 # max filename size on file system is 255, minus room for timestamp and random characters appended by Tempfile (used by atomic write)
EXCLUDED_DIRS = ['.', '..'].freeze
def initialize(cache_path, options = nil)
super(options)
@cache_path = cache_path.to_s
extend Strategy::LocalCache
end
def clear(options = nil)
root_dirs = Dir.entries(cache_path).reject{|f| f.in?(EXCLUDED_DIRS)}
FileUtils.rm_r(root_dirs.collect{|f| File.join(cache_path, f)})
end
def cleanup(options = nil)
options = merged_options(options)
search_dir(cache_path) do |fname|
key = file_path_key(fname)
entry = read_entry(key, options)
delete_entry(key, options) if entry && entry.expired?
end
end
def increment(name, amount = 1, options = nil)
file_name = key_file_path(namespaced_key(name, options))
lock_file(file_name) do
options = merged_options(options)
if num = read(name, options)
num = num.to_i + amount
write(name, num, options)
num
else
nil
end
end
end
def decrement(name, amount = 1, options = nil)
file_name = key_file_path(namespaced_key(name, options))
lock_file(file_name) do
options = merged_options(options)
if num = read(name, options)
num = num.to_i - amount
write(name, num, options)
num
else
nil
end
end
end
def delete_matched(matcher, options = nil)
options = merged_options(options)
instrument(:delete_matched, matcher.inspect) do
matcher = key_matcher(matcher, options)
search_dir(cache_path) do |path|
key = file_path_key(path)
delete_entry(key, options) if key.match(matcher)
end
end
end
protected
def read_entry(key, options)
file_name = key_file_path(key)
if File.exist?(file_name)
File.open(file_name) { |f| Marshal.load(f) }
end
rescue
nil
end
def write_entry(key, entry, options)
file_name = key_file_path(key)
ensure_cache_path(File.dirname(file_name))
File.atomic_write(file_name, cache_path) {|f| Marshal.dump(entry, f)}
true
end
def delete_entry(key, options)
file_name = key_file_path(key)
if File.exist?(file_name)
begin
File.delete(file_name)
delete_empty_directories(File.dirname(file_name))
true
rescue => e
# Just in case the error was caused by another process deleting the file first.
raise e if File.exist?(file_name)
false
end
end
end
private
# Lock a file for a block so only one process can modify it at a time.
def lock_file(file_name, &block) # :nodoc:
if File.exist?(file_name)
File.open(file_name, 'r+') do |f|
begin
f.flock File::LOCK_EX
yield
ensure
f.flock File::LOCK_UN
end
end
else
yield
end
end
# Translate a key into a file path.
def key_file_path(key)
fname = Rack::Utils.escape(key)
hash = Zlib.adler32(fname)
hash, dir_1 = hash.divmod(0x1000)
dir_2 = hash.modulo(0x1000)
fname_paths = []
# Make sure file name doesn't exceed file system limits.
begin
fname_paths << fname[0, FILENAME_MAX_SIZE]
fname = fname[FILENAME_MAX_SIZE..-1]
end until fname.blank?
File.join(cache_path, DIR_FORMATTER % dir_1, DIR_FORMATTER % dir_2, *fname_paths)
end
# Translate a file path into a key.
def file_path_key(path)
fname = path[cache_path.size, path.size].split(File::SEPARATOR, 4).last
Rack::Utils.unescape(fname)
end
# Delete empty directories in the cache.
def delete_empty_directories(dir)
return if dir == cache_path
if Dir.entries(dir).reject{|f| f.in?(EXCLUDED_DIRS)}.empty?
File.delete(dir) rescue nil
delete_empty_directories(File.dirname(dir))
end
end
# Make sure a file path's directories exist.
def ensure_cache_path(path)
FileUtils.makedirs(path) unless File.exist?(path)
end
def search_dir(dir, &callback)
return if !File.exist?(dir)
Dir.foreach(dir) do |d|
next if d.in?(EXCLUDED_DIRS)
name = File.join(dir, d)
if File.directory?(name)
search_dir(name, &callback)
else
callback.call name
end
end
end
end
end
end
|