1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220 | ------------------------------------------------------------------------------
-- Ada Web Server --
-- --
-- Copyright (C) 2000-2020, 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;
with Ada.Containers.Ordered_Maps;
with Ada.Exceptions;
with Ada.Real_Time;
with Ada.Streams.Stream_IO;
with Ada.Strings.Unbounded;
with Ada.Text_IO;
with Ada.Unchecked_Deallocation;
with AWS.Containers.Key_Value;
with AWS.Default;
with AWS.Utils.Streams;
package body AWS.Session is
use Ada.Exceptions;
use Ada.Streams;
use Ada.Strings.Unbounded;
SID_Prefix : constant String := "SID-";
Private_Key_Length : constant := 10;
-- Length of the string used for the private key
Check_Interval : Duration := Default.Session_Cleanup_Interval;
-- Check for obsolete section interval
Lifetime : Real_Time.Time_Span :=
Real_Time.To_Time_Span (Default.Session_Lifetime);
-- A session is obsolete if not used after Session_Lifetime seconds
Kind_Code : constant array (Value_Kind) of Character :=
(Int => 'I',
Real => 'R',
Bool => 'B',
Str => 'S',
User => 'U');
package Key_Value renames Containers.Key_Value;
type Key_Value_Set_Access is access Key_Value.Map;
procedure Unchecked_Free is new Ada.Unchecked_Deallocation
(Key_Value.Map, Key_Value_Set_Access);
-- table of session ID
type Session_Node is record
Created_Stamp : Calendar.Time;
Private_Key : String (1 .. Private_Key_Length);
Time_Stamp : Real_Time.Time;
Root : Key_Value_Set_Access;
end record;
package Session_Set is new Ada.Containers.Ordered_Maps (Id, Session_Node);
procedure Get_Node
(Sessions : in out Session_Set.Map;
SID : Id;
Node : out Session_Node;
Found : out Boolean);
-- Returns Node for specified SID, if found update the timestamp for
-- this node and set Found to True, otherwise set Found to False.
Max_Expired : constant := 50;
type Expired_SID_Array is array (1 .. Max_Expired) of Id;
-- Used by the task cleaner to get expired session from database
function V_Kind (K : Character) return Value_Kind;
-- Return the value kind for K (encoding in the string)
----------------------
-- Session Callback --
----------------------
Session_Callback : Callback := null;
--------------
-- Database --
--------------
protected Database is
entry Add_Session (SID : Id);
-- Add a new session ID into the database
function Creation_Stamp (SID : Id) return Calendar.Time;
-- Returns the creation date for this session
function Private_Key (SID : Id) return String;
-- Returns the session's private key
entry New_Session (SID : out Id);
-- Add a new session SID into the database
entry Delete_Session (SID : Id);
-- Removes session SID from the database
entry Delete_If_Empty (SID : Id; Removed : out Boolean);
-- Removes session SID only if there is no key/value pairs
function Session_Exist (SID : Id) return Boolean;
-- Returns True if session SID exist in the database
function Session_Has_Expired (SID : Id) return Boolean;
-- Returns True if session SID has exceeded its lifetime
function Length return Natural;
-- Returns number of sessions in database
function Length (SID : Id) return Natural;
-- Returns number of key/value pairs in session SID
procedure Touch_Session (SID : Id);
-- Updates the session Time_Stamp to current time. Does nothing if SID
-- does not exist.
procedure Key_Exist (SID : Id; Key : String; Result : out Boolean);
-- Result is set to True if Key_Name exist in session SID
procedure Get_Value
(SID : Id; Key : String; Value : out Unbounded_String);
-- Value is set with the value associated with the key Key_Name in
-- session SID.
entry Set_Value (SID : Id; Key, Value : String);
-- Add the pair key/value into the session SID
entry Remove_Key (SID : Id; Key : String);
-- Removes Key from the session SID
--
-- Unsafe routines. These are only to be used by iterators
--
procedure Destroy;
-- Release all memory associated with the database
procedure Prepare_Expired_SID
(Expired_SID : out Expired_SID_Array; Last : out Natural);
-- Checks for expired data and put them into the Expired_SID set.
-- The data will be removed later by the cleaner task.
-- This is used only in the cleaner task.
procedure Lock_And_Get_Sessions (First : out Session_Set.Cursor);
-- Increment Lock by 1, all entries modifying data are locked. Routines
-- reading values from the database can still be called (Key_Exist,
-- Get_Value, Session_Exist). Returns the Sessions tree first position.
procedure Lock_And_Get_Session
(SID : Id; Node : out Session_Node; Found : out Boolean);
-- Increment Lock by 1, all entries modifying data are locked. Routines
-- reading values from the database can still be called (Key_Exist,
-- Get_Value, Session_Exist). Returns the Session node.
procedure Unlock;
-- Decrement Lock by 1, unlock all entries when Lock return to 0
private
Lock_Counter : Natural := 0;
Sessions : Session_Set.Map;
Remove_Mark : Id := No_Session;
end Database;
-------------
-- Cleaner --
-------------
task body Cleaner is
use type Calendar.Time;
Next_Run : Calendar.Time := Calendar.Clock + Check_Interval;
L_SC : Callback with Atomic;
-- Local pointer to the session callback procedure. This is to ensure
-- that there is no race condition and that the code below will not
-- crash if SC pointer is changed.
Expired_SID : Expired_SID_Array;
E_Index : Natural;
begin
Clean_Dead_Sessions : loop
select
accept Stop;
exit Clean_Dead_Sessions;
or
accept Force;
or
delay until Next_Run;
end select;
Database.Prepare_Expired_SID (Expired_SID, E_Index);
L_SC := Session_Callback;
-- Use Session_Callback copy as we don't want the value to change
-- between the test and the call to the session callback routine.
for K in 1 .. E_Index loop
if L_SC /= null then
-- Run the session's callback routine, we catch all exceptions
-- here as we do not want to fail.
begin
L_SC.all (Expired_SID (K));
exception
when E : others =>
Text_IO.Put_Line
(Text_IO.Current_Error,
"Delete session callback error : "
& Exception_Information (E));
end;
end if;
-- Now we can delete the session data
Database.Delete_Session (Expired_SID (K));
end loop;
if E_Index = Max_Expired and then Check_Interval > 1.0 then
-- Too many expired session, we should run next expiration check
-- faster.
Next_Run := Next_Run + 1.0;
else
Next_Run := Next_Run + Check_Interval;
end if;
end loop Clean_Dead_Sessions;
Database.Destroy;
exception
when E : others =>
Text_IO.Put_Line
(Text_IO.Current_Error,
"Unrecoverable Error: Cleaner Task bug detected "
& Exception_Information (E));
end Cleaner;
-----------
-- Clear --
-----------
procedure Clear is
begin
Database.Destroy;
end Clear;
------------
-- Create --
------------
function Create return Id is
New_Id : Id;
begin
Database.New_Session (New_Id);
return New_Id;
end Create;
--------------------
-- Creation_Stamp --
--------------------
function Creation_Stamp (SID : Id) return Calendar.Time is
begin
return Database.Creation_Stamp (SID);
end Creation_Stamp;
---------------------
-- Cleaner_Control --
---------------------
protected body Cleaner_Control is
------------------
-- Server_Count --
------------------
function Server_Count return Natural is
begin
return S_Count;
end Server_Count;
-----------
-- Start --
-----------
procedure Start
(Check_Interval : Duration;
Lifetime : Duration;
Init_Cleaner : out Boolean) is
begin
S_Count := S_Count + 1;
Init_Cleaner := False;
if S_Count = 1 then
Session.Check_Interval := Start.Check_Interval;
Session.Lifetime := Real_Time.To_Time_Span (Start.Lifetime);
Init_Cleaner := True;
end if;
end Start;
----------
-- Stop --
----------
procedure Stop (Need_Release : out Boolean) is
begin
S_Count := S_Count - 1;
if S_Count = 0 then
Need_Release := True;
else
Need_Release := False;
end if;
end Stop;
end Cleaner_Control;
--------------
-- Database --
--------------
protected body Database is
-----------------
-- Add_Session --
-----------------
entry Add_Session (SID : Id) when Lock_Counter = 0 is
New_Node : Session_Node;
Cursor : Session_Set.Cursor;
Success : Boolean;
begin
New_Node :=
(Created_Stamp => Calendar.Clock,
Time_Stamp => Real_Time.Clock,
Private_Key => Utils.Random_String (Private_Key_Length),
Root => new Key_Value.Map);
Sessions.Insert (SID, New_Node, Cursor, Success);
if not Success then
Unchecked_Free (New_Node.Root);
end if;
end Add_Session;
--------------------
-- Creation_Stamp --
--------------------
function Creation_Stamp (SID : Id) return Calendar.Time is
Cursor : constant Session_Set.Cursor := Sessions.Find (SID);
begin
if Session_Set.Has_Element (Cursor) then
return Session_Set.Element (Cursor).Created_Stamp;
else
return Calendar.Clock;
end if;
end Creation_Stamp;
---------------------
-- Delete_If_Empty --
---------------------
entry Delete_If_Empty
(SID : Id; Removed : out Boolean) when Lock_Counter = 0
is
use type Ada.Containers.Count_Type;
Cursor : Session_Set.Cursor := Sessions.Find (SID);
Node : Session_Node;
begin
if Session_Set.Has_Element (Cursor) then
Node := Session_Set.Element (Cursor);
Removed := Node.Root.Length = 0;
if Removed then
Unchecked_Free (Node.Root);
Sessions.Delete (Cursor);
end if;
else
Removed := False;
end if;
end Delete_If_Empty;
--------------------
-- Delete_Session --
--------------------
entry Delete_Session (SID : Id) when Lock_Counter = 0 is
Cursor : Session_Set.Cursor := Sessions.Find (SID);
Node : Session_Node;
begin
if Session_Set.Has_Element (Cursor) then
Node := Session_Set.Element (Cursor);
Unchecked_Free (Node.Root);
Sessions.Delete (Cursor);
end if;
end Delete_Session;
-------------
-- Destroy --
-------------
procedure Destroy is
begin
for Item of Sessions loop
Unchecked_Free (Item.Root);
end loop;
Session_Set.Clear (Sessions);
end Destroy;
---------------
-- Get_Value --
---------------
procedure Get_Value
(SID : Id; Key : String; Value : out Unbounded_String)
is
Node : Session_Node;
Found : Boolean;
begin
Value := Null_Unbounded_String;
Get_Node (Sessions, SID, Node, Found);
if Found then
declare
Cursor : constant Key_Value.Cursor :=
Key_Value.Find (Node.Root.all, Key);
begin
if Key_Value.Has_Element (Cursor) then
Value := To_Unbounded_String (Key_Value.Element (Cursor));
end if;
end;
end if;
end Get_Value;
---------------
-- Key_Exist --
---------------
procedure Key_Exist
(SID : Id; Key : String; Result : out Boolean)
is
Node : Session_Node;
begin
Get_Node (Sessions, SID, Node, Result);
if Result then
Result := Key_Value.Contains (Node.Root.all, Key);
end if;
end Key_Exist;
------------
-- Length --
------------
function Length return Natural is
begin
return Natural (Sessions.Length);
end Length;
function Length (SID : Id) return Natural is
C : constant Session_Set.Cursor := Sessions.Find (SID);
begin
if Session_Set.Has_Element (C) then
return Natural (Session_Set.Element (C).Root.Length);
else
return 0;
end if;
end Length;
--------------------------
-- Lock_And_Get_Session --
--------------------------
procedure Lock_And_Get_Session
(SID : Id; Node : out Session_Node; Found : out Boolean)
is
C : constant Session_Set.Cursor := Sessions.Find (SID);
begin
Lock_Counter := Lock_Counter + 1;
Found := Session_Set.Has_Element (C);
if Found then
Node := Session_Set.Element (C);
end if;
end Lock_And_Get_Session;
---------------------------
-- Lock_And_Get_Sessions --
---------------------------
procedure Lock_And_Get_Sessions (First : out Session_Set.Cursor) is
begin
Lock_Counter := Lock_Counter + 1;
First := Database.Sessions.First;
end Lock_And_Get_Sessions;
-----------------
-- New_Session --
-----------------
entry New_Session (SID : out Id) when Lock_Counter = 0 is
New_Node : constant Session_Node :=
(Created_Stamp => Calendar.Clock,
Time_Stamp => Real_Time.Clock,
Private_Key =>
Utils.Random_String (Private_Key_Length),
Root => new Key_Value.Map);
Cursor : Session_Set.Cursor;
Success : Boolean;
begin
Generate_UID : loop
Utils.Random_String (String (SID));
Sessions.Insert (SID, New_Node, Cursor, Success);
exit Generate_UID when Success;
end loop Generate_UID;
end New_Session;
-------------------------
-- Prepare_Expired_SID --
-------------------------
procedure Prepare_Expired_SID
(Expired_SID : out Expired_SID_Array; Last : out Natural)
is
use type Real_Time.Time;
Now : constant Real_Time.Time := Real_Time.Clock;
Cursor : Session_Set.Cursor;
Node : Session_Node;
begin
Last := 0;
if Remove_Mark = No_Session then
Cursor := Sessions.First;
else
-- Try to continue iteration over container
Cursor := Sessions.Find (Remove_Mark);
Remove_Mark := No_Session;
if not Session_Set.Has_Element (Cursor) then
Cursor := Sessions.First;
end if;
end if;
while Session_Set.Has_Element (Cursor) loop
Node := Session_Set.Element (Cursor);
if Node.Time_Stamp + Lifetime < Now then
Last := Last + 1;
Expired_SID (Last) := Session_Set.Key (Cursor);
if Last = Expired_SID'Last then
-- No more space in the expired mailbox, quit now
Session_Set.Next (Cursor);
if Session_Set.Has_Element (Cursor) then
Remove_Mark := Session_Set.Key (Cursor);
end if;
exit;
end if;
end if;
Session_Set.Next (Cursor);
end loop;
end Prepare_Expired_SID;
-----------------
-- Private_Key --
-----------------
function Private_Key (SID : Id) return String is
Cursor : constant Session_Set.Cursor := Sessions.Find (SID);
begin
if Session_Set.Has_Element (Cursor) then
return Session_Set.Element (Cursor).Private_Key;
else
-- Must not be null as used as a key for an HMAC
return ".!.";
end if;
end Private_Key;
------------
-- Remove --
------------
entry Remove_Key (SID : Id; Key : String) when Lock_Counter = 0 is
Node : Session_Node;
Found : Boolean;
begin
Get_Node (Sessions, SID, Node, Found);
if Found then
Key_Value.Exclude (Node.Root.all, Key);
end if;
end Remove_Key;
-------------------
-- Session_Exist --
-------------------
function Session_Exist (SID : Id) return Boolean is
begin
return Sessions.Contains (SID);
end Session_Exist;
-------------------------
-- Session_Has_Expired --
-------------------------
function Session_Has_Expired (SID : Id) return Boolean is
use type Real_Time.Time;
Cursor : constant Session_Set.Cursor := Sessions.Find (SID);
begin
-- Do not use Get_Node, since that would update the timestamp
if Session_Set.Has_Element (Cursor) then
return Session_Set.Element (Cursor).Time_Stamp + Lifetime
< Real_Time.Clock;
end if;
return False;
end Session_Has_Expired;
---------------
-- Set_Value --
---------------
entry Set_Value
(SID : Id; Key, Value : String) when Lock_Counter = 0
is
Node : Session_Node;
Found : Boolean;
begin
Get_Node (Sessions, SID, Node, Found);
if Found then
Key_Value.Include (Node.Root.all, Key, Value);
end if;
end Set_Value;
-------------------
-- Touch_Session --
-------------------
procedure Touch_Session (SID : Id) is
Node : Session_Node;
Found : Boolean;
begin
Get_Node (Sessions, SID, Node, Found);
end Touch_Session;
------------
-- Unlock --
------------
procedure Unlock is
begin
Lock_Counter := Lock_Counter - 1;
end Unlock;
end Database;
------------
-- Delete --
------------
procedure Delete (SID : Id) is
begin
Database.Delete_Session (SID);
end Delete;
---------------------
-- Delete_If_Empty --
---------------------
function Delete_If_Empty (SID : Id) return Boolean is
Removed : Boolean;
begin
Database.Delete_If_Empty (SID, Removed);
return Removed;
end Delete_If_Empty;
-----------
-- Exist --
-----------
function Exist (SID : Id) return Boolean is
begin
return Database.Session_Exist (SID);
end Exist;
function Exist (SID : Id; Key : String) return Boolean is
Result : Boolean;
begin
Database.Key_Exist (SID, Key, Result);
return Result;
end Exist;
-----------------------
-- For_Every_Session --
-----------------------
procedure For_Every_Session is
use type Calendar.Time;
use type Real_Time.Time;
Now_Monoton : constant Real_Time.Time := Real_Time.Clock;
Now_Calendar : constant Calendar.Time := Calendar.Clock;
Cursor : Session_Set.Cursor;
Order : Positive := 1;
Quit : Boolean := False;
begin
Database.Lock_And_Get_Sessions (Cursor);
while Session_Set.Has_Element (Cursor) loop
Action
(Order,
Session_Set.Key (Cursor),
Now_Calendar
- Real_Time.To_Duration
(Now_Monoton - Session_Set.Element (Cursor).Time_Stamp),
Quit);
exit when Quit;
Order := Order + 1;
Session_Set.Next (Cursor);
end loop;
Database.Unlock;
exception
when others =>
Database.Unlock;
raise;
end For_Every_Session;
----------------------------
-- For_Every_Session_Data --
----------------------------
procedure For_Every_Session_Data (SID : Id) is
procedure For_Every_Data (Node : Session_Node);
-- Iterate through all Key/Value pairs
Node : Session_Node;
Order : Positive := 1;
Quit : Boolean := False;
Found : Boolean;
--------------------
-- For_Every_Data --
--------------------
procedure For_Every_Data (Node : Session_Node) is
begin
for Cursor in Node.Root.Iterate loop
declare
Value : constant String := Key_Value.Element (Cursor);
begin
Action
(Order,
Key_Value.Key (Cursor),
Value (Value'First + 1 .. Value'Last),
V_Kind (Value (Value'First)),
Quit);
end;
exit when Quit;
Order := Order + 1;
end loop;
end For_Every_Data;
begin
Database.Lock_And_Get_Session (SID, Node, Found);
if Found then
For_Every_Data (Node);
end if;
Database.Unlock;
exception
when others =>
Database.Unlock;
raise;
end For_Every_Session_Data;
------------------
-- Generic_Data --
------------------
package body Generic_Data is
---------
-- Get --
---------
function Get (SID : Id; Key : String) return Data is
Result : constant String := Get (SID, Key);
Str : aliased Utils.Streams.Strings;
Value : Data;
begin
if Result = "" then
return Null_Data;
else
Utils.Streams.Open (Str, Result);
Data'Read (Str'Access, Value);
return Value;
end if;
end Get;
---------
-- Set --
---------
procedure Set (SID : Id; Key : String; Value : Data) is
Str : aliased Utils.Streams.Strings;
begin
Data'Write (Str'Access, Value);
Database.Set_Value
(SID, Key, Kind_Code (User) & Utils.Streams.Value (Str'Access));
end Set;
end Generic_Data;
---------
-- Get --
---------
function Get (SID : Id; Key : String) return String is
Value : Unbounded_String;
begin
Database.Get_Value (SID, Key, Value);
if Length (Value) > 1 then
return Slice (Value, 2, Length (Value));
else
return "";
end if;
end Get;
function Get (SID : Id; Key : String) return Integer is
Value : constant String := Get (SID, Key);
begin
return Integer'Value (Value);
exception
when Constraint_Error =>
return 0;
end Get;
function Get (SID : Id; Key : String) return Float is
Value : constant String := Get (SID, Key);
begin
return Float'Value (Value);
exception
when Constraint_Error =>
return 0.0;
end Get;
function Get (SID : Id; Key : String) return Boolean is
begin
return Get (SID, Key) = "T";
end Get;
------------------
-- Get_Lifetime --
------------------
function Get_Lifetime return Duration is
begin
return Real_Time.To_Duration (Lifetime);
end Get_Lifetime;
--------------
-- Get_Node --
--------------
procedure Get_Node
(Sessions : in out Session_Set.Map;
SID : Id;
Node : out Session_Node;
Found : out Boolean)
is
Cursor : constant Session_Set.Cursor := Sessions.Find (SID);
procedure Process (Key : Id; Item : in out Session_Node);
-------------
-- Process --
-------------
procedure Process (Key : Id; Item : in out Session_Node) is
pragma Unreferenced (Key);
begin
Item.Time_Stamp := Real_Time.Clock;
Node := Item;
end Process;
begin
Found := Session_Set.Has_Element (Cursor);
if Found then
Session_Set.Update_Element (Sessions, Cursor, Process'Access);
end if;
end Get_Node;
-----------------
-- Has_Expired --
-----------------
function Has_Expired (SID : Id) return Boolean is
begin
return Database.Session_Has_Expired (SID);
end Has_Expired;
-----------
-- Image --
-----------
function Image (SID : Id) return String is
begin
return SID_Prefix & String (SID);
end Image;
------------
-- Length --
------------
function Length return Natural is
begin
return Database.Length;
end Length;
function Length (SID : Id) return Natural is
begin
return Database.Length (SID);
end Length;
----------
-- Load --
----------
procedure Load (File_Name : String) is
use Ada.Streams.Stream_IO;
File : File_Type;
Stream_Ptr : Stream_Access;
begin
Open (File, Name => File_Name, Mode => In_File);
Stream_Ptr := Stream (File);
while not End_Of_File (File) loop
declare
SID : constant Id := Id'Input (Stream_Ptr);
Key_Value_Size : Natural;
begin
Database.Add_Session (SID);
Key_Value_Size := Natural'Input (Stream_Ptr);
for I in 1 .. Key_Value_Size loop
declare
Key : constant String := String'Input (Stream_Ptr);
Value : constant String := String'Input (Stream_Ptr);
begin
Database.Set_Value (SID, Key, Value);
end;
end loop;
end;
end loop;
Close (File);
end Load;
-----------------
-- Private_Key --
-----------------
function Private_Key (SID : Id) return String is
begin
return Database.Private_Key (SID);
end Private_Key;
------------
-- Remove --
------------
procedure Remove (SID : Id; Key : String) is
begin
Database.Remove_Key (SID, Key);
end Remove;
----------
-- Save --
----------
procedure Save (File_Name : String) is
use Ada.Streams.Stream_IO;
File : File_Type;
Stream_Ptr : Stream_Access;
Position : Session_Set.Cursor;
procedure Process_Session;
-------------
-- Process --
-------------
procedure Process_Session is
Node : constant Session_Node :=
Session_Set.Element (Position);
Key_Value_Size : constant Natural :=
Natural (Key_Value.Length (Node.Root.all));
begin
if Key_Value_Size > 0 then
Id'Output (Stream_Ptr, Session_Set.Key (Position));
Natural'Output (Stream_Ptr, Key_Value_Size);
for Cursor in Node.Root.Iterate loop
String'Output (Stream_Ptr, Key_Value.Key (Cursor));
String'Output (Stream_Ptr, Key_Value.Element (Cursor));
end loop;
end if;
end Process_Session;
begin
Create (File, Name => File_Name);
Database.Lock_And_Get_Sessions (First => Position);
begin
Stream_Ptr := Stream (File);
while Session_Set.Has_Element (Position) loop
Process_Session;
Session_Set.Next (Position);
end loop;
exception
when others =>
-- Never leave this block without releasing the database lock
Database.Unlock;
raise;
end;
Database.Unlock;
Close (File);
end Save;
------------------
-- Server_Count --
------------------
function Server_Count return Natural is
begin
return Cleaner_Control.Server_Count;
end Server_Count;
---------
-- Set --
---------
procedure Set (SID : Id; Key : String; Value : String) is
begin
Database.Set_Value (SID, Key, Kind_Code (Str) & Value);
end Set;
procedure Set (SID : Id; Key : String; Value : Integer) is
V : constant String := Integer'Image (Value);
begin
if V (1) = ' ' then
Database.Set_Value (SID, Key, Kind_Code (Int) & V (2 .. V'Last));
else
Database.Set_Value (SID, Key, Kind_Code (Int) & V);
end if;
end Set;
procedure Set (SID : Id; Key : String; Value : Float) is
V : constant String := Float'Image (Value);
begin
if V (1) = ' ' then
Database.Set_Value (SID, Key, Kind_Code (Real) & V (2 .. V'Last));
else
Database.Set_Value (SID, Key, Kind_Code (Real) & V);
end if;
end Set;
procedure Set (SID : Id; Key : String; Value : Boolean) is
V : Character;
begin
if Value then
V := 'T';
else
V := 'F';
end if;
Database.Set_Value (SID, Key, Kind_Code (Bool) & V);
end Set;
------------------
-- Set_Callback --
------------------
procedure Set_Callback (Callback : Session.Callback) is
begin
Session_Callback := Callback;
end Set_Callback;
------------------
-- Set_Lifetime --
------------------
procedure Set_Lifetime (Seconds : Duration) is
begin
Lifetime := Real_Time.To_Time_Span (Seconds);
end Set_Lifetime;
-----------
-- Touch --
-----------
procedure Touch (SID : Id) is
begin
Database.Touch_Session (SID);
end Touch;
------------
-- V_Kind --
------------
function V_Kind (K : Character) return Value_Kind is
begin
case K is
when 'I' => return Int;
when 'S' => return Str;
when 'R' => return Real;
when 'B' => return Bool;
when 'U' => return User;
when others =>
raise Constraint_Error;
end case;
end V_Kind;
-----------
-- Value --
-----------
function Value (SID : String) return Id is
begin
if SID'Length /= Id'Length + SID_Prefix'Length
or else
(SID'Length > SID_Prefix'Length
and then
SID (SID'First .. SID'First + SID_Prefix'Length - 1) /= SID_Prefix)
then
return No_Session;
else
return Id (SID (SID'First + SID_Prefix'Length .. SID'Last));
end if;
end Value;
end AWS.Session;
|