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# frozen_string_literal: true
MIME::Types::Cache = Struct.new(:version, :data) # :nodoc:
# Caching of MIME::Types registries is advisable if you will be loading
# the default registry relatively frequently. With the class methods on
# MIME::Types::Cache, any MIME::Types registry can be marshaled quickly
# and easily.
#
# The cache is invalidated on a per-data-version basis; a cache file for
# version 3.2015.1118 will not be reused with version 3.2015.1201.
class << MIME::Types::Cache
# Attempts to load the cache from the file provided as a parameter or in
# the environment variable +RUBY_MIME_TYPES_CACHE+. Returns +nil+ if the
# file does not exist, if the file cannot be loaded, or if the data in
# the cache version is different than this version.
def load(cache_file = nil)
cache_file ||= ENV["RUBY_MIME_TYPES_CACHE"]
return nil unless cache_file && File.exist?(cache_file)
cache = Marshal.load(File.binread(cache_file))
if cache.version == MIME::Types::Data::VERSION
Marshal.load(cache.data)
else
MIME::Types.logger.error <<-WARNING.chomp.strip
Could not load MIME::Types cache: invalid version
WARNING
nil
end
rescue => e
MIME::Types.logger.error <<-WARNING.chomp.strip
Could not load MIME::Types cache: #{e}
WARNING
nil
end
# Attempts to save the types provided to the cache file provided.
#
# If +types+ is not provided or is +nil+, the cache will contain the
# current MIME::Types default registry.
#
# If +cache_file+ is not provided or is +nil+, the cache will be written
# to the file specified in the environment variable
# +RUBY_MIME_TYPES_CACHE+. If there is no cache file specified either
# directly or through the environment, this method will return +nil+
def save(types = nil, cache_file = nil)
cache_file ||= ENV["RUBY_MIME_TYPES_CACHE"]
return nil unless cache_file
types ||= MIME::Types.send(:__types__)
File.binwrite(cache_file, Marshal.dump(new(MIME::Types::Data::VERSION, Marshal.dump(types))))
end
end
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