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Class: CGI::Session::PStore

Relationships & Source Files
Inherits: Object
Defined in: lib/cgi/session/pstore.rb

Overview

PStore-based session storage class.

This builds upon the top-level PStore class provided by the library file pstore.rb. ::CGI::Session data is marshalled and stored in a file. File locking and transaction services are provided.

Class Method Summary

Instance Method Summary

  • #close

    Update and close the session's PStore file.

  • #delete

    Close and delete the session's PStore file.

  • #restore

    Restore session state from the session's PStore file.

  • #update

    Save session state to the session's PStore file.

Constructor Details

.new(session, option = {}) ⇒ PStore

Create a new PStore 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 PStore 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 PStore file. Defaults to the empty string.

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

[ GitHub ] 

  


# File 'lib/cgi/session/pstore.rb', line 46



def initialize(session, option={})
  dir = option['tmpdir'] || Dir::tmpdir
  prefix = option['prefix'] || ''
  id = session.session_id
  require 'digest/md5'
  md5 = Digest::MD5.hexdigest(id)[0,16]
  path = dir"/"prefix+md5
  path.untaint
  if File::exist?(path)
    @hash = nil
  else
    unless session.new_session
      raise CGI::Session::NoSession, "uninitialized session"
    end
    @hash = {}
  end
  @p = ::PStore.new(path)
  @p.transaction do |p|
    File.chmod(0600, p.path)
  end
end


  







Instance Method Details



  

    #close  
  



  

    

Update and close the session's PStore file.


  



  [ GitHub ]


  

  


# File 'lib/cgi/session/pstore.rb', line 88



def close
  update
end


  








  

    #delete  
  



  

    

Close and delete the session's PStore file.


  



  [ GitHub ]


  

  


# File 'lib/cgi/session/pstore.rb', line 93



def delete
  path = @p.path
  File::unlink path
end


  








  

    #restore  
  



  

    

Restore session state from the session's PStore file.



Returns the session state as a hash.


  



  [ GitHub ]


  

  


# File 'lib/cgi/session/pstore.rb', line 71



def restore
  unless @hash
    @p.transaction do
      @hash = @p['hash'] || {}
    end
  end
  @hash
end


  








  

    #update  
  



  

    

Save session state to the session's PStore file.


  



  [ GitHub ]


  

  


# File 'lib/cgi/session/pstore.rb', line 81



def update
  @p.transaction do
    @p['hash'] = @hash
  end
end