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-- Ada Web Server --
-- --
-- Copyright (C) 2000-2010, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify --
-- it under the terms of the GNU General Public License as published by --
-- the Free Software Foundation; either version 2 of the License, 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. See the GNU --
-- General Public License for more details. --
-- --
-- You should have received a copy of the GNU General Public License --
-- along with this library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
------------------------------------------------------------------------------
with Ada.Calendar;
with Ada.Exceptions;
with Ada.Finalization;
with Ada.Real_Time;
with Ada.Task_Attributes;
with AWS.Config;
with AWS.Default;
with AWS.Dispatchers;
with AWS.Exceptions;
with AWS.Hotplug;
with AWS.Log;
with AWS.Net.Acceptors;
with AWS.Net.SSL;
with AWS.Response;
with AWS.Status;
with AWS.Utils;
package AWS.Server is
type HTTP is limited private;
-- A Web server
---------------------------
-- Server initialization --
---------------------------
-- Note that starting a sercure server if AWS has not been configured to
-- support HTTPS will raise Program_Error.
procedure Start
(Web_Server : in out HTTP;
Callback : Response.Callback;
Config : AWS.Config.Object);
-- Start server using a full configuration object. With this routine it is
-- possible to control all features of the server. A simplified version of
-- Start is also provided below with the most common options.
procedure Start
(Web_Server : in out HTTP;
Dispatcher : Dispatchers.Handler'Class;
Config : AWS.Config.Object);
-- Idem, but using the dispatcher tagged type instead of callback. See
-- AWS.Services.Dispatchers and AWS.Dispatchers hierarchies for built-in
-- services and interface to build your own dispatcher models.
-- Note that a copy of the Dispatcher is keept into Web_Server. Any
-- changes done to the Dispatcher object will not be part of the Web
-- server dispatcher.
procedure Get_Message_Body;
-- If size of message body is bigger than Upload_Size_Limit configuration
-- parameter, server do not receive message body before calling user's
-- callback routine. If user decide to get the message body he should call
-- this routine.
procedure Start
(Web_Server : in out HTTP;
Name : String;
Callback : Response.Callback;
Max_Connection : Positive := Default.Max_Connection;
Admin_URI : String := Default.Admin_URI;
Port : Natural := Default.Server_Port;
Security : Boolean := False;
Session : Boolean := False;
Case_Sensitive_Parameters : Boolean := True;
Upload_Directory : String := Default.Upload_Directory;
Line_Stack_Size : Positive := Default.Line_Stack_Size);
-- Start the Web server. Max_Connection is the number of simultaneous
-- connections the server's will handle (the number of slots in AWS).
-- Name is just a string used to identify the server. This is used
-- for example in the administrative page. Admin_URI must be set to enable
-- the administrative status page. Callback is the procedure to call for
-- each resource requested. Port is the Web server port. If Security is
-- set to True the server will use an HTTPS/SSL connection. If Session is
-- set to True the server will be able to get a status for each client
-- connected. A session Id is used for that, on the client side it is a
-- cookie. Case_Sensitive_Parameters if set to False it means that the
-- parameters name will be handled without case sensitivity. Upload
-- directory point to a directory where uploaded files will be stored.
------------------------
-- Server termination --
------------------------
procedure Shutdown (Web_Server : in out HTTP);
-- Stop the server and release all associated memory. This routine can
-- take some time to terminate because it waits for all tasks to terminate
-- properly before releasing the memory. The log facilities will be
-- automatically stopped by calling Stop_Log below.
type Termination is (No_Server, Q_Key_Pressed, Forever);
procedure Wait (Mode : Termination := No_Server);
-- The purpose of this procedure is to control the main procedure
-- termination. This procedure will return only when no server are running
-- (No_Server mode) or the 'q' key has been pressed. If mode is set to
-- Forever, Wait will never return and the process will have to be killed.
--------------------------
-- Server configuration --
--------------------------
function Config (Web_Server : HTTP) return AWS.Config.Object;
-- Returns configuration object for Web_Server
procedure Set_Unexpected_Exception_Handler
(Web_Server : in out HTTP;
Handler : Exceptions.Unexpected_Exception_Handler);
-- Set the unexpected exception handler. It is called whenever an
-- unrecoverable error has been detected. The default handler just display
-- (on standard output) an error message with the location of the
-- error. By changing this handler it is possible to log or display full
-- symbolic stack backtrace if needed.
procedure Set
(Web_Server : in out HTTP;
Dispatcher : Dispatchers.Handler'Class);
-- Dynamically associate a new dispatcher object to the server. With the
-- feature it is possible to change server behavior at runtime. The
-- complete set of callback procedures will be changed when calling this
-- routine. Note that any change in a dispatcher associated with a server
-- using Register or Unregister must be reset into the server using this
-- routine.
procedure Set_Security
(Web_Server : in out HTTP;
Certificate_Filename : String;
Security_Mode : Net.SSL.Method := Net.SSL.SSLv23_Server;
Key_Filename : String := "");
-- Set security option for AWS. Certificate_Filename is the name of a file
-- containing a certificate. Key_Filename is the name of the file
-- containing the key, if the empty string the key will be taken from the
-- certificate filename. This must be called before starting the secure
-- server otherwise the default security options or options set in the
-- config files will be used. After that the call will have no effect.
procedure Set_Socket_Constructor
(Web_Server : in out HTTP;
Socket_Constructor : Net.Socket_Constructor);
-- Set the socket constructor routine to use when creating new sockets on
-- the server. By calling this routine it is possible to replace the
-- default AWS communication layer used. The default constructor is
-- AWS.Net.Socket. Note that this routine must be called before starting
-- the server. It is also important to note that sockets returned by the
-- constructor must have the cache properly initialized. See AWS.Net.Cache
-- for more information.
type HTTP_Access is access all HTTP;
function Get_Current return HTTP_Access;
-- Get current server. This can be used in a callback procedure to
-- retrieve the running HTTP server. It is needed when a callback
-- procedure is shared by multiple servers.
function Get_Status return Status.Data;
-- Returns the current status data. This is useful to get the full status
-- in a templates engine callback procedure for example.
function Session_Name return String;
-- Returns the current session cookie name
---------------
-- Other API --
---------------
procedure Give_Back_Socket
(Web_Server : in out HTTP; Socket : Net.Socket_Type'Class);
-- Give the socket back to the server. Socket must have been taken from
-- the server using the Response.Socket_Taken routine in a callback.
procedure Give_Back_Socket
(Web_Server : in out HTTP; Socket : Net.Socket_Access);
-- Idem.
-- Use Socket_Access to avoid memory reallocation for already allocated
-- sockets.
procedure Set_Field (Id, Value : String);
-- Set the extended log field value for the server the controlling the
-- current task.
procedure Skip_Log_Record;
-- Disable logging only for the current processing request
private
procedure Default_Unexpected_Exception_Handler
(E : Ada.Exceptions.Exception_Occurrence;
Log : in out AWS.Log.Object;
Error : Exceptions.Data;
Answer : in out Response.Data);
-- Default unexpected exception handler
procedure Socket_Taken;
-- Mark socket of the cureent line of the current server taken
------------
-- Phases --
------------
type Slot_Phase is
(Closed,
-- Socket has been closed on the server side
In_Shutdown,
-- Phase when socket is marked in protected Slots for shutdown
Aborted,
-- Slot was aborted by means of socket shutdown
Wait_For_Client,
-- We can abort keep-alive connection in this stage
Client_Header,
-- We can abort keep-alive connection when client header
-- takes too much time
Client_Data,
-- We should think about it. Maybe we should not trust the clients
-- who are spending too much server time in sending data
Server_Response,
-- We are trusting ourselves but client may be too slow purposely in
-- receiving data and we should disconnect him
Server_Processing
-- While in the User defined Dispatch procedure
);
subtype Abortable_Phase is Slot_Phase
range Wait_For_Client .. Server_Response;
subtype Data_Phase is Abortable_Phase
range Client_Data .. Server_Response;
--------------
-- Timeouts --
--------------
type Timeout_Mode is (Cleaner, Force);
-- This is Force timeouts and timeouts for Line_Cleaner task
type Timeouts_Array is array (Timeout_Mode, Abortable_Phase) of Duration;
type Data_Timeouts_Array is array (Data_Phase) of Duration;
subtype Socket_Access is Net.Socket_Access;
----------
-- Slot --
----------
type Slot is record
Sock : Socket_Access := null;
Socket_Taken : Boolean := False;
Phase : Slot_Phase := Closed;
Phase_Time_Stamp : Ada.Real_Time.Time := Ada.Real_Time.Clock;
Alive_Time_Stamp : Ada.Calendar.Time;
Slot_Activity_Counter : Natural := 0;
Activity_Counter : Natural := 0;
Alive_Counter : Natural;
end record;
-- Abortable is set to true when the line can be aborted by closing the
-- associated socket. Phase_Time_Stamp is the last time when Phase of line
-- has been changed. The line in Abortable state and with oldest
-- Phase_Time_Stamp could be closed.
-- Also a line is closed after Keep_Open_Duration seconds of inactivity.
type Slot_Set is array (Positive range <>) of Slot;
package CNF renames AWS.Config;
-- Socket Data used to retrieve safely socket information
type Socket_Data (Peername_Length : Natural) is record
Peername : String (1 .. Peername_Length);
FD : Integer;
end record;
-----------
-- Slots --
-----------
protected type Slots (N : Positive) is
procedure Mark_Phase (Index : Positive; Phase : Slot_Phase);
-- Set Activity_Time_Stamp which is the last time where the line number
-- Index as been used.
procedure Check_Data_Timeout (Index : Positive);
-- Check timeout of send/receive message body
procedure Socket_Taken (Index : Positive);
-- Used to mark slot associated socket has "taken" by some foreign code.
-- The server must not close this socket on releasing the slot. It is
-- used when passing socket to the server push part for example. In the
-- future it could be used for other functionality over the same
-- socket, changing HTTP to other protocol for example.
procedure Prepare_Back (Index : Positive; Possible : out Boolean);
-- Test and prepare to put socket back into acceptor.
-- If Possible value become False, it is not possible to
-- back socket into acceptor because socket already in shutdown process.
function Is_Abortable (Index : Positive) return Boolean;
-- Return True when slot can be aborted due to "forced" timeouts
procedure Abort_On_Timeout
(Socket : out Socket_Access; Index : in out Positive);
-- Get the socket pointer from slot where timeout exceeded.
-- Index IN value is the current slot number, to avoid current slot
-- abortion.
-- Index OUT value is the slot number to abort.
-- Return null if no such sockets.
function Free_Slots return Natural;
-- Returns number of free slots
procedure Set (Socket : Socket_Access; Index : Positive);
-- Mark slot at position Index to be used. This slot will be associated
-- with Socket. Phase set to Wait_For_Client.
procedure Get_For_Shutdown
(Index : Positive; Socket : out Socket_Access);
-- Get socket from the slot for shutdown, Slot phase is set to
-- In_Shutdown.
procedure Shutdown_Done (Index : Positive);
-- Called when Shutdown is complete, Slot phase is set to Aborted
entry Release (Index : Positive; Shutdown : out Boolean);
-- Release slot number Index. Slot phase is set to Closed.
-- Set the shutdown flag to True is called task have to
-- shutdown and free the socket.
-- Note that calling task is only the Line task,
-- so the socket need to be shutdown is in the stack on the Line task.
function Get (Index : Positive) return Slot;
-- Returns Slot data
function Phase (Index : Positive) return Slot_Phase;
-- Returns Slot phase
function Get_Socket_Info (Index : Positive) return Socket_Data;
-- Returns information about socket (FD and Peername) associated with
-- slot Index. If the socket is not opened returns
-- (FD => 0, Peername => "-")
function Get_Peername (Index : Positive) return String;
-- Returns the peername for socket at position Index
procedure Increment_Slot_Activity_Counter
(Index : Positive; Free_Slots : out Natural);
-- Add 1 to the slot activity. This is the total number of request
-- handled by the slot.
-- Returns number of Free slots in the Free_Slot out parameter, it is
-- necessary information for Server line task to determine is it
-- necessary to call Force_Clean and to determine keep-alive
-- availability.
procedure Set_Timeouts
(Phase_Timeouts : Timeouts_Array;
Data_Timeouts : Data_Timeouts_Array);
-- Setup timeouts for slots before starting
private
Timeouts : Timeouts_Array;
Data_Timeouts : Data_Timeouts_Array;
Table : Slot_Set (1 .. N);
Count : Natural := N;
Shutdown_Count : Natural := 0;
Last_Force : Ada.Calendar.Time := Ada.Calendar.Clock;
end Slots;
type Slots_Access is access Slots;
----------
-- Line --
----------
task type Line (Stack_Size : Integer) is
pragma Storage_Size (Stack_Size);
entry Start (Server : HTTP; Index : Positive);
end Line;
type Line_Access is access Line;
type Line_Set is array (Positive range <>) of Line_Access;
type Line_Set_Access is access Line_Set;
----------
-- HTTP --
----------
type HTTP is new Ada.Finalization.Limited_Controlled with record
Self : HTTP_Access := HTTP'Unchecked_Access;
-- Point to the record
Start_Time : Ada.Calendar.Time;
-- Date and Time when server was started
Shutdown : Boolean := True;
-- True when server is shutdown. This will be set to False when server
-- will be started.
Acceptor : Net.Acceptors.Acceptor_Type;
-- This is the socket set where server socket and keep alive sockets
-- waiting for read availability.
Accept_Sem : Utils.Semaphore;
-- Semaphore used to serialize the waiting of the available socket on
-- Acceptor.
Properties : CNF.Object := CNF.Get_Current;
-- All server properties controled by the configuration file
Log : AWS.Log.Object;
-- Logging support
Error_Log : aliased AWS.Log.Object;
-- Error loggin support
Dispatcher : Dispatchers.Handler_Class_Access;
-- Dispatcher for the user actions
New_Dispatcher : Dispatchers.Handler_Class_Access;
-- New dispatcher set in a user's callback, if set this dispatcher will
-- replace the main dispatcher above.
Dispatcher_Sem : Utils.RW_Semaphore (Writers => 1);
-- RW semaphore to be able to change dynamically the Dispatcher object
Filters : Hotplug.Filter_Set;
-- Hotplug filters are recorded here
Lines : Line_Set_Access;
-- The tasks doing the job
Slots : Slots_Access;
-- Information about each tasks above. This is a protected object to
-- support concurrency.
Exception_Handler : Exceptions.Unexpected_Exception_Handler
:= Default_Unexpected_Exception_Handler'Access;
-- Exception handle used for unexpected errors found on the server
-- implementation.
SSL_Config : Net.SSL.Config;
end record;
overriding procedure Finalize (Web_Server : in out HTTP);
type Line_Attribute_Record is record
Server : HTTP_Access;
Line : Positive;
Stat : Status.Data;
Expect_100 : Boolean;
Skip_Log : Boolean := False;
Log_Data : AWS.Log.Fields_Table;
end record;
package Line_Attribute is new Ada.Task_Attributes
(Line_Attribute_Record, (Line => 1, others => <>));
-- A line specific attribute
procedure Null_Procedure is null;
First_Server : not null access procedure := Null_Procedure'Access;
-- This procedure calls on first server started
No_Servers : not null access procedure := Null_Procedure'Access;
-- This procedure calls on last server shutdown
end AWS.Server;
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