Class: CGI::Session::FileStore

Class | CGI::Session::FileStore
In: | cgi/session.rb
Parent: | Object

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.

### Methods

close delete new restore update

### Public Class methods

new(session, option={})

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 initialiser. The following options are recognised:

tmpdir: | the directory to use for storing the FileStore file. Defaults to Dir::tmpdir (generally "/tmp" on Unix systems).
prefix: | the prefix to add to the session id when generating the filename for this session’s FileStore file. Defaults to the empty string.
suffix: | the prefix to add to the session id when generating the filename for this session’s FileStore file. Defaults to the empty string.

This session’s FileStore file will be created if it does not exist, or opened if it does.

[Source]

    # File cgi/session.rb, line 375
          def initialize(session, option={})
            dir = option['tmpdir'] || Dir::tmpdir
           prefix = option['prefix'] || ''
            suffix = option['suffix'] || ''
            id = session.session_id
            require 'digest/md5'
            md5 = Digest::MD5.hexdigest(id)[0,16]
            @path = dir+"/"+prefix+md5+suffix
            unless File::exist? @path
              unless session.new_session
                raise CGI::Session::NoSession, "uninitialized session"
              end
              @hash = {}
            end
          end

### Public Instance methods

close()

Update and close the session’s FileStore file.

[Source]

    # File cgi/session.rb, line 427
          def close
            update
          end

delete()

Close and delete the session’s FileStore file.

[Source]

    # File cgi/session.rb, line 432
          def delete
            File::unlink @path
          rescue Errno::ENOENT
          end

restore()

Restore session state from the session’s FileStore file.

Returns the session state as a hash.

[Source]

    # File cgi/session.rb, line 394
          def restore
            unless @hash
              @hash = {}
              begin
                f = File.open(@path, 'r')
                f.flock File::LOCK_SH
                for line in f
                  line.chomp!
                  k, v = line.split('=',2)
                  @hash[CGI::unescape(k)] = CGI::unescape(v)
                end
              ensure
                f.close unless f.nil?
              end
            end
            @hash
          end

update()

Save session state to the session’s FileStore file.

[Source]

    # File cgi/session.rb, line 413
          def update
            return unless @hash
            begin
              f = File.open(@path, File::CREAT|File::TRUNC|File::RDWR, 0600)
              f.flock File::LOCK_EX
              for k,v in @hash
                f.printf "%s=%s\n", CGI::escape(k), CGI::escape(String(v))
              end
            ensure
              f.close unless f.nil?
            end
          end

[Validate]