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require 'active_support/core_ext/file/atomic'
module ActiveSupport
module Cache
# A cache store implementation which stores everything on the filesystem.
class FileStore < Store
attr_reader :cache_path
def initialize(cache_path)
@cache_path = cache_path
end
# Reads a value from the cache.
#
# Possible options:
# - +:expires_in+ - the number of seconds that this value may stay in
# the cache.
def read(name, options = nil)
super do
file_name = real_file_path(name)
expires = expires_in(options)
if File.exist?(file_name) && (expires <= 0 || Time.now - File.mtime(file_name) < expires)
File.open(file_name, 'rb') { |f| Marshal.load(f) }
end
end
end
# Writes a value to the cache.
def write(name, value, options = nil)
super do
ensure_cache_path(File.dirname(real_file_path(name)))
File.atomic_write(real_file_path(name), cache_path) { |f| Marshal.dump(value, f) }
value
end
rescue => e
logger.error "Couldn't create cache directory: #{name} (#{e.message})" if logger
end
def delete(name, options = nil)
super do
File.delete(real_file_path(name))
end
rescue SystemCallError => e
# If there's no cache, then there's nothing to complain about
end
def delete_matched(matcher, options = nil)
super do
search_dir(@cache_path) do |f|
if f =~ matcher
begin
File.delete(f)
rescue SystemCallError => e
# If there's no cache, then there's nothing to complain about
end
end
end
end
end
def exist?(name, options = nil)
super do
File.exist?(real_file_path(name))
end
end
private
def real_file_path(name)
'%s/%s.cache' % [@cache_path, name.gsub('?', '.').gsub(':', '.')]
end
def ensure_cache_path(path)
FileUtils.makedirs(path) unless File.exist?(path)
end
def search_dir(dir, &callback)
Dir.foreach(dir) do |d|
next if d == "." || d == ".."
name = File.join(dir, d)
if File.directory?(name)
search_dir(name, &callback)
else
callback.call name
end
end
end
end
end
end
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