File-based session storage class.
Implements session storage as a flat file of ‘key=value’ values. This storage type only works directly with String values; the user is responsible for converting other types to Strings when storing and from Strings when retrieving.
# File tmp/rubies/ruby-2.5.9/lib/cgi/session.rb, line 375
def initialize(session, option={})
dir = option['tmpdir'] || Dir::tmpdir
prefix = option['prefix'] || 'cgi_sid_'
suffix = option['suffix'] || ''
id = session.session_id
require 'digest/md5'
md5 = Digest::MD5.hexdigest(id)[0,16]
@path = dir+"/"+prefix+md5+suffix
if File::exist? @path
@hash = nil
else
unless session.new_session
raise CGI::Session::NoSession, "uninitialized session"
end
@hash = {}
end
end
Create a new FileStore instance.
This constructor is used internally by CGI::Session. The user does not generally need to call it directly.
session is the session for which this instance is being created. The session id must only contain alphanumeric characters; automatically generated session ids observe this requirement.
option is a hash of options for the initializer. The following options are recognised:
- tmpdir
-
the directory to use for storing the
FileStorefile. Defaults toDir::tmpdir(generally “/tmp” on Unix systems). - prefix
-
the prefix to add to the session id when generating the filename for this session’s
FileStorefile. Defaults to “cgi_sid_”. - suffix
-
the prefix to add to the session id when generating the filename for this session’s
FileStorefile. Defaults to the empty string.
This session’s FileStore file will be created if it does not exist, or opened if it does.
# File tmp/rubies/ruby-2.5.9/lib/cgi/session.rb, line 435
def close
update
end
Update and close the session’s FileStore file.
# File tmp/rubies/ruby-2.5.9/lib/cgi/session.rb, line 440
def delete
File::unlink @path+".lock" rescue nil
File::unlink @path+".new" rescue nil
File::unlink @path rescue nil
end
Close and delete the session’s FileStore file.
# File tmp/rubies/ruby-2.5.9/lib/cgi/session.rb, line 396
def restore
unless @hash
@hash = {}
begin
lockf = File.open(@path+".lock", "r")
lockf.flock File::LOCK_SH
f = File.open(@path, 'r')
for line in f
line.chomp!
k, v = line.split('=',2)
@hash[CGI::unescape(k)] = Marshal.restore(CGI::unescape(v))
end
ensure
f.close unless f.nil?
lockf.close if lockf
end
end
@hash
end
Restore session state from the session’s FileStore file.
Returns the session state as a hash.
# File tmp/rubies/ruby-2.5.9/lib/cgi/session.rb, line 417
def update
return unless @hash
begin
lockf = File.open(@path+".lock", File::CREAT|File::RDWR, 0600)
lockf.flock File::LOCK_EX
f = File.open(@path+".new", File::CREAT|File::TRUNC|File::WRONLY, 0600)
for k,v in @hash
f.printf "%s=%s\n", CGI::escape(k), CGI::escape(String(Marshal.dump(v)))
end
f.close
File.rename @path+".new", @path
ensure
f.close if f
lockf.close if lockf
end
end
Save session state to the session’s FileStore file.