/usr/share/ada/adainclude/aws/aws-services-download.adb is in libaws3.2.0-dev 3.2.0-3.
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-- Ada Web Server --
-- --
-- Copyright (C) 2005-2014, 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. --
-- --
-- --
-- --
-- --
-- --
-- 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/>. --
-- --
-- --
-- --
-- --
-- --
-- --
-- --
------------------------------------------------------------------------------
pragma Ada_2012;
with Ada.Calendar;
with Ada.Exceptions;
with Ada.Streams;
with Ada.Strings.Unbounded;
with Ada.Text_IO;
with Ada.Unchecked_Deallocation;
with Ada.Containers.Vectors;
with AWS.Messages;
with AWS.MIME;
with AWS.Net.Buffered;
with AWS.Net.Generic_Sets;
with AWS.Parameters;
with AWS.Services.Dispatchers.URI;
with AWS.Templates;
with AWS.Utils;
package body AWS.Services.Download is
use Ada;
use Ada.Containers;
use Ada.Exceptions;
use Ada.Streams;
use Ada.Strings.Unbounded;
URI_Prefix : constant String := "$dm_prefix$";
-- The URI prefix used for all the download manager request
W_Tmplt : constant String := "aws_download_manager_waiting.thtml";
S_Tmplt : constant String := "aws_download_manager_start.thtml";
type Waiting_Position is new Natural;
-- The position in the waiting line, 0 means that the download can be
-- started. 1 means in the first position in the waiting line, the download
-- will start as soon as a download terminates.
type Download_Information is record
URI : Unbounded_String; -- download manager unique key URI
Name : Unbounded_String; -- the resource name (filename)
R_URI : Unbounded_String; -- the resource URI
Started : Boolean; -- True if download can start
Header : Boolean; -- True if HTTP header sent
Stream : Resources.Streams.Stream_Access; -- data stream (input)
Socket : Net.Socket_Access; -- client socket (output)
Position : Waiting_Position; -- position in the waiting line
Index : Positive; -- item vector index (for fast update)
Time_Stamp : Calendar.Time; -- when the download was created
end record;
No_Information : constant Download_Information :=
(Null_Unbounded_String, Null_Unbounded_String,
Null_Unbounded_String, False, False, null, null,
0, 1, Calendar.Clock);
package Download_Vectors is
new Containers.Vectors (Positive, Download_Information);
use Download_Vectors;
-- The task that handles the downloads
task type Download_Manager with Priority => Config.Service_Priority is
end Download_Manager;
type Download_Manager_Access is access Download_Manager;
DM : Download_Manager_Access;
-- The download manager created in the start routine
-- The socket set (multiplexer)
Max_Concurrent_Download : Positive;
package Sock_Set is new Net.Generic_Sets (Download_Information);
-- Data manager
protected Data_Manager is
procedure Insert (Download : Download_Information);
-- Add a new download data information
procedure Update (Download : Download_Information);
-- Update the download information (Download.URI is the unique key)
procedure Remove (Download : Download_Information);
-- Remove the download information, this is either because the download
-- is terminated or an error occurs during the download (interrupted by
-- the user).
entry Ready;
-- Returns if there is at least one download to do
procedure Create_Set (Socket_Set : in out Sock_Set.Socket_Set_Type);
-- Returns in Socket_Set the socket to look at for output availability
procedure Get (URI : String; Download : out Download_Information);
-- Returns the Download_Information for the given URI or No_Information
-- if this URI is not part of the download data. Note that this routine
-- also set the Index and Position fields according to the position in
-- the vector.
procedure Get_UID (UID : out Positive);
-- Returns a unique ID
procedure Set_Shutdown;
-- Download manager shutdown requested
function Shutdown return Boolean;
-- Returns the shutdown status
procedure Release;
-- Release memory associated with the data manager
private
procedure Check_Queue;
-- Check all sockets in the queue and set Socket_Present if sockets are
-- present so waiting for data.
Count : Natural := 0;
-- Set to true when there is nothing to do
Downloads : Vector;
function Index (Download : Download_Information) return Positive;
-- Returns the updated index for Download, 0 if not found
UID : Natural := 0;
Closing : Boolean := False;
Socket_Present : Boolean := False;
end Data_Manager;
----------------
-- DM_Handler --
----------------
DM_Handler : Dispatchers.URI.Handler;
function CB (Request : Status.Data) return Response.Data;
-- Download manager callback handler
-----------
-- Build --
-----------
function Build
(Request : Status.Data;
Name : String;
Resource : not null access Resources.Streams.Stream_Type'Class)
return Response.Data
is
UID : Positive;
begin
Data_Manager.Get_UID (UID);
declare
Key_URI : constant String :=
Status.URI (Request) & "$" & Utils.Image (UID);
begin
Data_Manager.Insert
(Download =>
(To_Unbounded_String (Key_URI), To_Unbounded_String (Name),
To_Unbounded_String (Status.URI (Request)),
False, False,
Resources.Streams.Stream_Access (Resource), null,
0, 1, Calendar.Clock));
return Response.URL
("/" & URI_Prefix & "?RES_URI=" & Key_URI,
Cache_Control => Messages.No_Cache);
end;
end Build;
--------
-- CB --
--------
function CB (Request : Status.Data) return Response.Data is
P_List : constant Parameters.List := Status.Parameters (Request);
URI : constant String := Parameters.Get (P_List, "RES_URI");
Info : Download_Information;
begin
Data_Manager.Get (URI, Info);
if Info = No_Information then
-- This should not happen, guard against bad URL (reload after
-- interrupted download).
return Response.Acknowledge
(Messages.S404, "<p>Download manager page not registered!");
end if;
if Info.Position = 0 then
-- Download can be started now
if Info.Started then
-- Let's go now, set the client side socket
Info.Socket := new Net.Socket_Type'Class'(Status.Socket (Request));
Data_Manager.Update (Info);
return Response.Socket_Taken;
else
-- Display the start page before launching the download
Info.Started := True;
Data_Manager.Update (Info);
return Response.Build
(MIME.Text_HTML,
String'(Templates.Parse
(S_Tmplt,
(1 => Templates.Assoc ("NAME", To_String (Info.Name)),
2 => Templates.Assoc
("RES_URI", To_String (Info.R_URI))))));
end if;
else
return Response.Build
(MIME.Text_HTML,
String'(Templates.Parse
(W_Tmplt,
(1 => Templates.Assoc ("NAME", To_String (Info.Name)),
2 => Templates.Assoc ("RES_URI", To_String (Info.R_URI)),
3 => Templates.Assoc
("POSITION", Positive (Info.Position))))));
end if;
end CB;
----------
-- Data --
----------
protected body Data_Manager is
-----------------
-- Check_Queue --
-----------------
procedure Check_Queue is
use type Net.Socket_Access;
begin
Socket_Present := False;
Check_Socket_Present : for K in 1 .. Natural (Downloads.Length) loop
if Downloads.Element (K).Socket /= null then
Socket_Present := True;
exit Check_Socket_Present;
end if;
end loop Check_Socket_Present;
end Check_Queue;
----------------
-- Create_Set --
----------------
procedure Create_Set (Socket_Set : in out Sock_Set.Socket_Set_Type) is
use type Net.Socket_Access;
Info : Download_Information;
N : Positive;
begin
N := Positive'Min
(Max_Concurrent_Download, Positive (Downloads.Length));
for K in 1 .. N loop
Info := Downloads.Element (K);
if Info.Socket /= null then
Sock_Set.Add (Socket_Set, Info.Socket, Sock_Set.Output);
Sock_Set.Set_Data (Socket_Set, Sock_Set.Socket_Count (K), Info);
end if;
end loop;
end Create_Set;
---------
-- Get --
---------
procedure Get (URI : String; Download : out Download_Information) is
use type Calendar.Time;
Info : Download_Information;
Index : Natural := 0;
begin
-- First remove old entries which have not been checked for at least
-- 15 seconds.
Remove_Old_Entries : while not Downloads.Is_Empty loop
Info := Downloads.First_Element;
if Calendar.Clock - Info.Time_Stamp > 15.0 then
Downloads.Delete_First;
Count := Count - 1;
else
exit Remove_Old_Entries;
end if;
end loop Remove_Old_Entries;
-- Look for the given URI in the vector
for K in 1 .. Natural (Downloads.Length) loop
Info := Downloads.Element (K);
if URI = To_String (Info.URI) then
Index := K;
exit;
end if;
end loop;
if Index = 0 then
-- Not found
Info := No_Information;
else
Info.Index := Index;
-- As this download was checked, update time-stamp
Info.Time_Stamp := Calendar.Clock;
Downloads.Replace_Element (Index, Info);
if Index <= Max_Concurrent_Download then
Info.Position := 0;
else
Info.Position :=
Waiting_Position (Index - Max_Concurrent_Download);
end if;
end if;
Download := Info;
Check_Queue;
end Get;
-------------
-- Get_UID --
-------------
procedure Get_UID (UID : out Positive) is
begin
Data_Manager.UID := Data_Manager.UID + 1;
UID := Data_Manager.UID;
end Get_UID;
-----------
-- Index --
-----------
function Index (Download : Download_Information) return Positive is
begin
-- Use Download.Index for fast lookup, this was the original position
-- for this item. The new position is either at the same index or in
-- a lower position in case some downloads have endded since we got
-- this item.
for K in reverse 1 .. Download.Index loop
if Download.URI = Downloads.Element (K).URI then
return K;
end if;
end loop;
raise Constraint_Error;
end Index;
------------
-- Insert --
------------
procedure Insert (Download : Download_Information) is
begin
Downloads.Append (Download);
Count := Count + 1;
end Insert;
-----------
-- Ready --
-----------
entry Ready when Socket_Present or else Closing is
begin
null;
end Ready;
-------------
-- Release --
-------------
procedure Release is
begin
Downloads.Clear;
Socket_Present := False;
Count := 0;
end Release;
------------
-- Remove --
------------
procedure Remove (Download : Download_Information) is
begin
Downloads.Delete (Index (Download));
Count := Count - 1;
Check_Queue;
end Remove;
------------------
-- Set_Shutdown --
------------------
procedure Set_Shutdown is
begin
Closing := True;
end Set_Shutdown;
--------------
-- Shutdown --
--------------
function Shutdown return Boolean is
begin
return Closing;
end Shutdown;
------------
-- Update --
------------
procedure Update (Download : Download_Information) is
use type Net.Socket_Access;
begin
-- Set Socket_Ready status if a socket is available
if Download.Socket /= null then
Socket_Present := True;
end if;
Downloads.Replace_Element (Index (Download), Download);
end Update;
end Data_Manager;
----------------------
-- Download_Manager --
----------------------
task body Download_Manager is
procedure Send_Header
(Socket_Set : in out Sock_Set.Socket_Set_Type;
N : Sock_Set.Socket_Count;
Info : in out Download_Information);
-- Send HTTP headers
procedure Send_Data
(Info : Download_Information;
Done : out Boolean);
-- Send some data for Info. Done is set to true if the download is
-- completed.
---------------
-- Send_Data --
---------------
procedure Send_Data
(Info : Download_Information;
Done : out Boolean)
is
Buffer_Size : constant := 4 * 1_024;
Buffer : Streams.Stream_Element_Array (1 .. Buffer_Size);
Last : Streams.Stream_Element_Offset;
begin
Resources.Streams.Read (Info.Stream.all, Buffer, Last);
Done := Last < Buffer'First;
if not Done then
Net.Buffered.Write (Info.Socket.all, Buffer (1 .. Last));
end if;
end Send_Data;
-----------------
-- Send_Header --
-----------------
procedure Send_Header
(Socket_Set : in out Sock_Set.Socket_Set_Type;
N : Sock_Set.Socket_Count;
Info : in out Download_Information)
is
pragma Unreferenced (Socket_Set, N);
Sock : constant Net.Socket_Type'Class := Info.Socket.all;
begin
Info.Header := True;
Data_Manager.Update (Info);
Net.Buffered.Put_Line (Sock, Messages.Status_Line (Messages.S200));
Net.Buffered.Put_Line
(Sock,
"Date: " & Messages.To_HTTP_Date (Utils.GMT_Clock));
-- Server
Net.Buffered.Put_Line
(Sock,
"Server: AWS (Ada Web Server) v" & Version);
Net.Buffered.Put_Line (Sock, Messages.Connection ("close"));
Net.Buffered.Put_Line
(Sock, Messages.Content_Length
(Resources.Streams.Size (Info.Stream.all)));
Net.Buffered.Put_Line
(Sock, Messages.Content_Type (MIME.Application_Octet_Stream));
Net.Buffered.Put_Line
(Sock, Messages.Content_Disposition
("attachment", To_String (Info.Name), To_String (Info.Name)));
Net.Buffered.New_Line (Sock);
Net.Buffered.Flush (Sock);
end Send_Header;
Socket_Set : Sock_Set.Socket_Set_Type;
Count : Sock_Set.Socket_Count;
Done : Boolean;
begin
Main : loop
Data_Manager.Ready;
exit Main when Data_Manager.Shutdown;
-- Some data are ready to be sent
Data_Manager.Create_Set (Socket_Set);
Sock_Set.Wait (Socket_Set, Net.Forever, Count);
-- For all write ready socket, send some data
for K in 1 .. Sock_Set.Count (Socket_Set) loop
Done := False;
declare
Info : Download_Information :=
Sock_Set.Get_Data (Socket_Set, K);
begin
if Sock_Set.Is_Write_Ready (Socket_Set, K) then
begin
if not Info.Header then
Send_Header (Socket_Set, K, Info);
end if;
Send_Data (Info, Done);
if Done then
Net.Buffered.Flush (Info.Socket.all);
Net.Shutdown (Info.Socket.all);
end if;
exception
when Net.Socket_Error =>
Done := True;
end;
if Done then
Resources.Streams.Close (Info.Stream.all);
end if;
elsif Sock_Set.Is_Error (Socket_Set, K) then
Done := True;
end if;
if Done then
-- Remove this socket from the server
Data_Manager.Remove (Info);
end if;
end;
end loop;
Sock_Set.Reset (Socket_Set);
end loop Main;
exception
when E : others =>
Text_IO.Put_Line
(Text_IO.Current_Error,
"Download manager bug detected: " & Exception_Information (E));
end Download_Manager;
-----------
-- Start --
-----------
procedure Start
(Server_Dispatcher : AWS.Dispatchers.Handler'Class;
Main_Dispatcher : out Services.Dispatchers.Linker.Handler;
Max_Concurrent_Download : Positive := Config.Max_Concurrent_Download) is
begin
Download.Max_Concurrent_Download := Max_Concurrent_Download;
-- Set the dispatcher
Dispatchers.URI.Register (DM_Handler, "/" & URI_Prefix, CB'Access, True);
Dispatchers.Linker.Register
(Main_Dispatcher, Server_Dispatcher, DM_Handler);
-- Start download manager task
DM := new Download_Manager;
end Start;
----------
-- Stop --
----------
procedure Stop is
procedure Unchecked_Free is new Unchecked_Deallocation
(Download_Manager, Download_Manager_Access);
begin
Dispatchers.URI.Unregister (DM_Handler, "/" & URI_Prefix);
Data_Manager.Set_Shutdown;
while not DM'Terminated loop
delay 0.1;
end loop;
Unchecked_Free (DM);
Data_Manager.Release;
end Stop;
end AWS.Services.Download;
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