/usr/share/ada/adainclude/aws/aws-session.ads is in libaws3.3.2-dev 3.3.2-2.
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-- Ada Web Server --
-- --
-- Copyright (C) 2000-2014, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify --
-- it under terms of the GNU General Public License as published by the --
-- Free Software Foundation; either version 3, or (at your option) any --
-- later version. This library is distributed in the hope that it will be --
-- useful, but WITHOUT ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are --
-- granted additional permissions described in the GCC Runtime Library --
-- Exception, version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
------------------------------------------------------------------------------
pragma Ada_2012;
-- This is the API to handle session data for each client connected
with Ada.Calendar;
private with AWS.Config;
package AWS.Session is
type Id is private;
type Value_Kind is (Int, Str, Real, Bool, User);
No_Session : constant Id;
function Create return Id with
Post => Create'Result /= No_Session;
-- Create a new uniq Session Id
procedure Delete (SID : Id) with
Post => not Exist (SID);
-- Delete session, does nothing if SID does not exist.
-- In most cases, the client browser will still send the cookie identifying
-- the session on its next request. In such a case, the function
-- AWS.Status.Timed_Out will return True, same as when the session was
-- deleted automatically by AWS when it expired.
-- The recommended practice is therefore to call
-- AWS.Response.Set.Clear_Session when you send a response to the customer
-- after deleting the session, so that the cookie is not sent again.
function Delete_If_Empty (SID : Id) return Boolean;
-- Delete session only if there is no key/value pairs.
-- Returns True if session deleted.
-- Need to delete not used just created session to avoid too many empty
-- session creation.
function Image (SID : Id) return String with Inline;
-- Return ID image
function Value (SID : String) return Id with Inline;
-- Build an ID from a String, returns No_Session if SID is not recongnized
-- as an AWS session ID.
function Exist (SID : Id) return Boolean;
-- Returns True if SID exist
procedure Touch (SID : Id);
-- Update to current time the timestamp associated with SID. Does nothing
-- if SID does not exist.
procedure Set (SID : Id; Key : String; Value : String);
-- Set key/value pair for the SID
procedure Set (SID : Id; Key : String; Value : Integer);
-- Set key/value pair for the SID
procedure Set (SID : Id; Key : String; Value : Float);
-- Set key/value pair for the SID
procedure Set (SID : Id; Key : String; Value : Boolean);
-- Set key/value pair for the SID
function Get (SID : Id; Key : String) return String with
Inline => True,
Post => (not Exist (SID, Key) and then Get'Result'Length = 0)
or else Exist (SID, Key);
-- Returns the Value for Key in the session SID or the emptry string if
-- key does not exist.
function Get (SID : Id; Key : String) return Integer with
Inline => True,
Post => (not Exist (SID, Key) and then Get'Result = 0)
or else Exist (SID, Key);
-- Returns the Value for Key in the session SID or the integer value 0 if
-- key does not exist or is not an integer.
function Get (SID : Id; Key : String) return Float with
Inline => True,
Post => (not Exist (SID, Key) and then Get'Result = 0.0)
or else Exist (SID, Key);
-- Returns the Value for Key in the session SID or the float value 0.0 if
-- key does not exist or is not a float.
function Get (SID : Id; Key : String) return Boolean with
Inline => True,
Post => (not Exist (SID, Key) and then Get'Result = False)
or else Exist (SID, Key);
-- Returns the Value for Key in the session SID or the boolean False if
-- key does not exist or is not a boolean.
generic
type Data is private;
Null_Data : Data;
package Generic_Data is
procedure Set (SID : Id; Key : String; Value : Data);
-- Set key/value pair for the SID
function Get (SID : Id; Key : String) return Data with Inline;
-- Returns the Value for Key in the session SID or Null_Data if
-- key does not exist.
end Generic_Data;
procedure Remove (SID : Id; Key : String) with
Post => not Exist (SID, Key);
-- Removes Key from the specified session
function Exist (SID : Id; Key : String) return Boolean;
-- Returns True if Key exist in session SID
function Server_Count return Natural;
-- Returns number of servers with sessions support
function Length return Natural;
-- Returns number of sessions
function Length (SID : Id) return Natural;
-- Returns number of key/value pairs in session SID
procedure Clear with Post => Length = 0;
-- Removes all sessions data
---------------
-- Iterators --
---------------
generic
with procedure Action
(N : Positive;
SID : Id;
Time_Stamp : Ada.Calendar.Time;
Quit : in out Boolean);
procedure For_Every_Session;
-- Iterator which call Action for every active session. N is the SID
-- order. Time_Stamp is the time when SID was updated for the last
-- time. Quit is set to False by default, it is possible to control the
-- iterator termination by setting its value to True. Note that in the
-- Action procedure it is possible to use routines that read session's
-- data (Get, Exist) but any routines which modify the data will block
-- (i.e. Touch, Set, Remove, Delete will dead lock).
generic
with procedure Action
(N : Positive;
Key, Value : String;
Kind : Value_Kind;
Quit : in out Boolean);
procedure For_Every_Session_Data (SID : Id);
-- Iterator which returns all the key/value pair defined for session SID.
-- Quit is set to False by default, it is possible to control the iterator
-- termination by setting its value to True. Note that in the Action
-- procedure it is possible to use routines that read session's data (Get,
-- Exist) but any routines which modify the data will block (i.e. Touch,
-- Set, Remove, Delete will dead lock).
--------------
-- Lifetime --
--------------
procedure Set_Lifetime (Seconds : Duration);
-- Set the lifetime for session data. At the point a session is deleted,
-- reusing the session ID makes AWS.Status.Session_Timed_Out return True.
function Get_Lifetime return Duration;
-- Get current session lifetime for session data
function Has_Expired (SID : Id) return Boolean;
-- Returns true if SID should be considered as expired (ie there hasn't
-- been any transaction on it since Get_Lifetime seconds. Such a session
-- should be deleted. Calling this function is mostly internal to AWS, and
-- sessions are deleted automatically when they expire.
----------------------
-- Session Callback --
----------------------
type Callback is access procedure (SID : Id);
-- Callback procedure called when a sesssion is deleted from the server
procedure Set_Callback (Callback : Session.Callback);
-- Set the callback procedure to call when a session is deleted from the
-- server. If Callback is Null the session's callback will be removed.
----------------
-- Session IO --
----------------
procedure Save (File_Name : String);
-- Save all sessions data into File_Name
procedure Load (File_Name : String);
-- Restore all sessions data from File_Name
private
type Id is new String (1 .. Config.Session_Id_Length);
No_Session : constant Id := (others => ' ');
task type Cleaner with Priority => Config.Session_Cleaner_Priority is
entry Stop;
entry Force;
end Cleaner;
-- Call Database.Clean every Session_Lifetime seconds
type Cleaner_Access is access Cleaner;
Cleaner_Task : Cleaner_Access;
---------------------
-- Cleaner_Control --
---------------------
protected Cleaner_Control is
procedure Start (Check_Interval : Duration; Lifetime : Duration);
-- Launch the cleaner task the first time and does nothing after
procedure Stop (Need_Release : out Boolean);
-- Stop the cleaner task when there is no more server using it. Release
-- is set to True if the Cleaner_Task can be released.
function Server_Count return Natural;
-- Returns number of servers with sessions support
private
S_Count : Natural := 0;
end Cleaner_Control;
end AWS.Session;
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