mirror of https://github.com/rails/rails
r2790@asus: jeremy | 2005-07-04 16:30:58 -0700
smart active record session class. session class is pluggable; a basic SqlBypass class is provided. set CGI::Session::ActiveRecordStore.session_class = SqlBypass and set SqlBypass.connection = SomeARConnection. Further tests pending. git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1671 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
This commit is contained in:
Jeremy Kemper
parent
e7b142aef7
commit
452442dde8
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@ -1,82 +1,262 @@
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begin
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require 'active_record'
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require 'cgi'
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require 'cgi/session'
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require 'digest/md5'
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require 'base64'
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# Contributed by Tim Bates
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class CGI
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class Session
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# Active Record database-based session storage class.
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# A session store backed by an Active Record class.
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#
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# Implements session storage in a database using the ActiveRecord ORM library. Assumes that the database
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# has a table called +sessions+ with columns +id+ (numeric, primary key), +sessid+ and +data+ (text).
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# The session data is stored in the +data+ column in the binary Marshal format; the user is responsible for ensuring that
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# only data that can be Marshaled is stored in the session.
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# A default class is provided, but any object duck-typing to an Active
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# Record +Session+ class with text +session_id+ and +data+ attributes
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# may be used as the backing store.
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#
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# Adding +created_at+ or +updated_at+ datetime columns to the sessions table will enable stamping of the data, which can
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# be used to clear out old sessions.
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# The default assumes a +sessions+ tables with columns +id+ (numeric
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# primary key), +session_id+ (text), and +data+ (text). Session data is
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# marshaled to +data+. +session_id+ should be indexed for speedy lookups.
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#
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# It's highly recommended to have an index on the sessid column to improve performance.
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# Since the default class is a simple Active Record, you get timestamps
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# for free if you add +created_at+ and +updated_at+ datetime columns to
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# the +sessions+ table, making periodic session expiration a snap.
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#
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# You may provide your own session class, whether a feature-packed
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# Active Record or a bare-metal high-performance SQL store, by setting
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# +CGI::Session::ActiveRecordStore.session_class = MySessionClass+
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# You must implement these methods:
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# self.find_by_session_id(session_id)
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# initialize(hash_of_session_id_and_data)
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# attr_reader :session_id
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# attr_accessor :data
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# save!
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# destroy
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#
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# The fast SqlBypass class is a generic SQL session store. You may
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# use it as a basis for high-performance database-specific stores.
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class ActiveRecordStore
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# The ActiveRecord class which corresponds to the database table.
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# The default Active Record class.
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class Session < ActiveRecord::Base
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self.table_name = 'sessions'
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before_create :marshal_data!
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before_update :marshal_data_if_changed!
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after_save :clear_data_cache!
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class << self
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# Hook to set up sessid compatibility.
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def find_by_session_id(session_id)
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setup_sessid_compatibility!
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find_by_session_id(session_id)
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end
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# Compatibility with tables using sessid instead of session_id.
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def setup_sessid_compatibility!
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if !@sessid_compatibility_checked
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if columns_hash['sessid']
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def self.find_by_session_id(*args)
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find_by_sessid(*args)
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end
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alias_method :session_id, :sessid
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define_method(:session_id) { sessid }
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define_method(:session_id=) { |session_id| self.sessid = session_id }
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else
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def self.find_by_session_id(session_id)
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find :first, :conditions => ["session_id #{attribute_condition(session_id)}", session_id]
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end
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end
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@sessid_compatibility_checked = true
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end
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end
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def marshal(data) Base64.encode64(Marshal.dump(data)) end
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def unmarshal(data) Marshal.load(Base64.decode64(data)) end
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def fingerprint(data) Digest::MD5.hexdigest(data) end
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def create_table!
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connection.execute <<-end_sql
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CREATE TABLE #{table_name} (
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id INTEGER PRIMARY KEY,
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#{connection.quote_column_name('session_id')} TEXT UNIQUE,
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#{connection.quote_column_name('data')} TEXT
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)
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end_sql
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end
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def drop_table!
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connection.execute "DROP TABLE #{table_name}"
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end
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end
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# Lazy-unmarshal session state.
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def data
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unless @data
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@data = self.class.unmarshal(read_attribute('data'))
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@fingerprint = self.class.fingerprint(@data)
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end
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@data
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end
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private
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def marshal_data!
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write_attribute('data', self.class.marshal(@data || {}))
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end
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def marshal_data_if_changed!
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if @data and @fingerprint != self.class.fingerprint(@data)
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marshal_data!
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end
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end
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def clear_data_cache!
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@data = @fingerprint = nil
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end
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end
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# Create a new ActiveRecordStore instance. This constructor is used internally by CGI::Session.
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# The user does not generally need to call it directly.
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# A barebones session store which duck-types with the default session
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# store but bypasses Active Record and issues SQL directly.
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#
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# +session+ is the session for which this instance is being created.
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# The database connection, table name, and session id and data columns
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# are configurable class attributes. Marshaling and unmarshaling
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# are implemented as class methods that you may override. By default,
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# marshaling data is +Base64.encode64(Marshal.dump(data))+ and
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# unmarshaling data is +Marshal.load(Base64.decode64(data))+.
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#
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# +option+ is currently ignored as no options are recognized.
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#
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# This session's ActiveRecord database row will be created if it does not exist, or opened if it does.
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def initialize(session, option=nil)
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ActiveRecord::Base.silence do
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@session = Session.find_by_sessid(session.session_id) || Session.new("sessid" => session.session_id, "data" => marshalize({}))
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@data = unmarshalize(@session.data)
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# This marshaling behavior is intended to store the widest range of
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# binary session data in a +text+ column. For higher performance,
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# store in a +blob+ column instead and forgo the Base64 encoding.
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class SqlBypass
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# Use the ActiveRecord::Base.connection by default.
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cattr_accessor :connection
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def self.connection
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@@connection ||= ActiveRecord::Base.connection
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end
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# The table name defaults to 'sessions'.
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cattr_accessor :table_name
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@@table_name = 'sessions'
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# The session id field defaults to 'session_id'.
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cattr_accessor :session_id_column
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@@session_id_column = 'session_id'
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# The data field defaults to 'data'.
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cattr_accessor :data_column
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@@data_column = 'data'
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class << self
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# Look up a session by id and unmarshal its data if found.
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def find_by_session_id(session_id)
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if record = @@connection.select_one("SELECT * FROM #{@@table_name} WHERE #{@@session_id_column}=#{@@connection.quote(session_id)}")
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new(:session_id => session_id, :marshaled_data => record['data'])
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end
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end
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def marshal(data) Base64.encode64(Marshal.dump(data)) end
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def unmarshal(data) Marshal.load(Base64.decode64(data)) end
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def fingerprint(data) Digest::MD5.hexdigest(data) end
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def create_table!
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@@connection.execute <<-end_sql
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CREATE TABLE #{table_name} (
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#{@@connection.quote_column_name(session_id_column)} TEXT PRIMARY KEY,
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#{@@connection.quote_column_name(data_column)} TEXT
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)
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end_sql
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end
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def drop_table!
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@@connection.execute "DROP TABLE #{table_name}"
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end
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end
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attr_reader :session_id
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attr_writer :data
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# Look for normal and marshaled data, self.find_by_session_id's way of
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# telling us to postpone unmarshaling until the data is requested.
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# We need to handle a normal data attribute in case of a new record.
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def initialize(attributes)
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@session_id, @data, @marshaled_data = attributes[:session_id], attributes[:data], attributes[:marshaled_data]
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@new_record = !@marshaled_data.nil?
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end
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# Lazy-unmarshal session state. Take a fingerprint so we can detect
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# whether to save changes later.
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def data
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if @marshaled_data
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@data, @marshaled_data = self.class.unmarshal(@marshaled_data), nil
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@fingerprint = self.class.fingerprint(@data)
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end
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@data
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end
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def save!
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if @new_record
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@new_record = false
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@@connection.update <<-end_sql, 'Create session'
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INSERT INTO #{@@table_name} (
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#{@@connection.quote_column_name(@@session_id_column)},
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#{@@connection.quote_column_name(@@data_column)} )
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VALUES (
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#{@@connection.quote(session_id)},
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#{@@connection.quote(self.class.marshal(data))} )
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end_sql
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elsif self.class.fingerprint(data) != @fingerprint
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@@connection.update <<-end_sql, 'Update session'
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UPDATE #{@@table_name}
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SET #{@@connection.quote_column_name(@@data_column)}=#{@@connection.quote(self.class.marshal(data))}
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WHERE #{@@connection.quote_column_name(@@session_id_column)}=#{@@connection.quote(session_id)}
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end_sql
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end
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end
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def destroy
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unless @new_record
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@@connection.delete <<-end_sql, 'Destroy session'
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DELETE FROM #{@@table_name}
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WHERE #{@@connection.quote_column_name(@@session_id_column)}=#{@@connection.quote(session_id)}
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end_sql
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end
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end
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end
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# Update and close the session's ActiveRecord object.
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# The class used for session storage. Defaults to
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# CGI::Session::ActiveRecordStore::Session.
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cattr_accessor :session_class
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@@session_class = Session
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# Find or instantiate a session given a CGI::Session.
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def initialize(session, option = nil)
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session_id = session.session_id
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unless @session = @@session_class.find_by_session_id(session_id)
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unless session.new_session
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raise CGI::Session::NoSession, 'uninitialized session'
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end
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@session = @@session_class.new(:session_id => session_id, :data => {})
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end
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end
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# Restore session state. The session model handles unmarshaling.
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def restore
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@session.data
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end
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# Save session store.
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def update
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@session.save!
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end
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# Save and close the session store.
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def close
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return unless @session
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update
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@session = nil
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end
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# Close and destroy the session's ActiveRecord object.
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# Delete and close the session store.
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def delete
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return unless @session
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@session.destroy
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@session.destroy rescue nil
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@session = nil
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end
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end
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# Restore session state from the session's ActiveRecord object.
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def restore
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return unless @session
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@data = unmarshalize(@session.data)
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end
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# Save session state in the session's ActiveRecord object.
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def update
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return unless @session
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ActiveRecord::Base.silence { @session.update_attribute "data", marshalize(@data) }
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end
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private
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def unmarshalize(data)
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Marshal.load(Base64.decode64(data))
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end
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def marshalize(data)
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Base64.encode64(Marshal.dump(data))
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end
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end #ActiveRecordStore
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end #Session
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end #CGI
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rescue LoadError
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# Couldn't load Active Record, so don't make this store available
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end
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end
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@ -0,0 +1,91 @@
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# Unfurl the safety net.
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path_to_ar = File.dirname(__FILE__) + '/../../../activerecord'
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if Object.const_defined?(:ActiveRecord) or File.exist?(path_to_ar)
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begin
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# These tests exercise CGI::Session::ActiveRecordStore, so you're going to
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# need AR in a sibling directory to AP and have SQLite3 installed.
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unless Object.const_defined?(:ActiveRecord)
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require "#{File.dirname(__FILE__)}/../../../activerecord/lib/active_record"
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end
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require File.dirname(__FILE__) + '/../abstract_unit'
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require 'action_controller/session/active_record_store'
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CGI::Session::ActiveRecordStore::Session.establish_connection(:adapter => 'sqlite3', :dbfile => ':memory:')
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def setup_session_schema(connection, table_name = 'sessions', session_id_column_name = 'sessid', data_column_name = 'data')
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connection.execute <<-end_sql
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create table #{table_name} (
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id integer primary key,
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#{connection.quote_column_name(session_id_column_name)} text unique,
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#{connection.quote_column_name(data_column_name)} text
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)
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end_sql
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end
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class ActiveRecordStoreTest < Test::Unit::TestCase
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def session_class
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CGI::Session::ActiveRecordStore::Session
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end
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def setup
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session_class.create_table!
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ENV['REQUEST_METHOD'] = 'GET'
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CGI::Session::ActiveRecordStore.session_class = session_class
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@new_session = CGI::Session.new(CGI.new, :database_manager => CGI::Session::ActiveRecordStore, :new_session => true)
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@new_session['foo'] = 'bar'
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end
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def teardown
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session_class.drop_table!
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end
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def test_basics
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session_id = @new_session.session_id
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@new_session.close
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found = session_class.find_by_session_id(session_id)
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assert_not_nil found
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assert_equal 'bar', found.data['foo']
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end
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end
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class SqlBypassActiveRecordStoreTest < Test::Unit::TestCase
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def session_class
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CGI::Session::ActiveRecordStore::SqlBypass
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end
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def setup
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session_class.connection = CGI::Session::ActiveRecordStore::Session.connection
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session_class.create_table!
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ENV['REQUEST_METHOD'] = 'GET'
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CGI::Session::ActiveRecordStore.session_class = session_class
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@new_session = CGI::Session.new(CGI.new, :database_manager => CGI::Session::ActiveRecordStore, :new_session => true)
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end
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def teardown
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session_class.drop_table!
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end
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def test_basics
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session_id = @new_session.session_id
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@new_session.close
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found = session_class.find_by_session_id(session_id)
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assert_not_nil found
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assert_equal 'bar', found.data['foo']
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end
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end
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# End of safety net.
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rescue Object => e
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$stderr.puts "Skipping CGI::Session::ActiveRecordStore tests: #{e}"
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#$stderr.puts " #{e.backtrace.join("\n ")}"
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end
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end
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