modules/ud/ud_recover.c
/* [<][>][^][v][top][bottom][index][help] */
FUNCTIONS
This source file includes following functions.
- TR_create_record
- TR_update_record
- tr_get_sql_record
- tr_get_long
- tr_get_int
- tr_get_str
- tr_get_dummies
- TR_get_record
- TR_delete_record
- TR_recover
- TR_check
1 /***************************************
2 $Revision: 1.6 $
3
4 Functions to keep records for crash recovery
5
6 Status: NOT REVUED, NOT TESTED
7
8 Author(s): Andrei Robachevsky
9
10 ******************/ /******************
11 Modification History:
12 andrei (11/08/2000) Created.
13 ******************/ /******************
14 Copyright (c) 2000,2001 RIPE NCC
15
16 All Rights Reserved
17
18 Permission to use, copy, modify, and distribute this software and its
19 documentation for any purpose and without fee is hereby granted,
20 provided that the above copyright notice appear in all copies and that
21 both that copyright notice and this permission notice appear in
22 supporting documentation, and that the name of the author not be
23 used in advertising or publicity pertaining to distribution of the
24 software without specific, written prior permission.
25
26 THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
27 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS; IN NO EVENT SHALL
28 AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
29 DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
30 AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
31 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
32 ***************************************/
33
34 #include "rip.h"
35
36 /*************************************************************
37
38 SQL Tables used to keep records needed for crash recovery
39
40 CREATE TABLE transaction_rec (
41 0 transaction_id int(11) DEFAULT '0' NOT NULL auto_increment,
42 1 object_id int(10) unsigned DEFAULT '0' NOT NULL,
43 2 sequence_id int(10) unsigned DEFAULT '1' NOT NULL,
44 3 object_type tinyint(3) unsigned DEFAULT '0' NOT NULL,
45 4 save varchar(256) DEFAULT '' NOT NULL,
46 5 error_script blob DEFAULT '' NOT NULL,
47 6 mode tinyint(4) unsigned DEFAULT '0' NOT NULL,
48 7 succeeded tinyint(4) unsigned DEFAULT '0' NOT NULL,
49 8 action tinyint(4) unsigned DEFAULT '0' NOT NULL,
50 9 status tinyint(10) unsigned DEFAULT '0' NOT NULL,
51 10 clean tinyint(3) DEFAULT '0' NOT NULL,
52 PRIMARY KEY (transaction_id)
53 );
54
55
56
57 CREATE TABLE dummy_rec (
58 transaction_id int(11) DEFAULT '0' NOT NULL,
59 object_id int(10) unsigned DEFAULT '0' NOT NULL,
60 PRIMARY KEY (transaction_id, object_id)
61 );
62
63 *************************************************************/
64
65 /************************************************************
66 * int TR_create_record() *
67 * *
68 * Create TR record *
69 * *
70 * First tries to delete record with the same transaction_id *
71 * ( transaction_id == tr->transaction_id ) *
72 * Then creates a new record in transaction_rec table *
73 * *
74 * Returns: transaction_id *
75 * *
76 ************************************************************/
77
78 long TR_create_record(Transaction_t *tr)
/* [<][>][^][v][top][bottom][index][help] */
79 {
80 SQ_result_set_t *sql_result;
81 GString *query;
82 int sql_err;
83
84 if(tr->load_pass != 0) return(0); /* for fast loader just return */
85
86 if ((query = g_string_sized_new(STR_L)) == NULL){
87 ER_perror(FAC_UD, UD_MEM, "cannot allocate gstring\n");
88 die;
89 }
90 /* delete record if exists*/
91
92 TR_delete_record(tr);
93
94
95 /* compose record */
96
97 tr->action = TR_ACTION(tr->action) + TCP_ROLLBACK;
98
99 g_string_sprintf(query, "INSERT transaction_rec "
100 "SET transaction_id=%ld, "
101 "object_id=%ld, "
102 "sequence_id=%ld, "
103 "object_type=%d, "
104 "mode=%d, "
105 "action=%d, "
106 "status=%d ",
107 tr->transaction_id, tr->object_id, tr->sequence_id, tr->class_type, tr->mode, TR_ACTION(tr->action), TR_STATUS(TCP_ROLLBACK));
108 sql_err=SQ_execute_query(tr->sql_connection, query->str, &sql_result);
109
110
111 /* in case of an error copy error code and return */
112 if(sql_err) {
113 ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(tr->sql_connection), query->str);
114 die;
115 }
116 g_string_free(query, TRUE);
117 return(tr->transaction_id);
118 }
119
120
121 /************************************************************
122 * int TR_update_record() *
123 * *
124 * UPdates TR record (transaction_rec or dummy_rec tables) *
125 * *
126 * Updates the following fields: *
127 * TF_DUMMY - dummy_rec, adding ID's as dummies are created *
128 * TF_SAVE - writes down tr->save *
129 * TF_STATUS - updates status (checkpointing) *
130 * TF_ESCRIPT - saves error script tr->error_script *
131 * *
132 * Returns: transaction_id *
133 * *
134 ************************************************************/
135
136 long TR_update_record(Transaction_t *tr, int field)
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137 {
138 SQ_result_set_t *sql_result;
139 GString *query;
140 int sql_err;
141
142 if(tr->load_pass != 0) return(0); /* for fast loader just return */
143
144 if ((query = g_string_sized_new(STR_L)) == NULL){
145 ER_perror(FAC_UD, UD_MEM, "cannot allocate gstring\n");
146 die;
147 }
148
149 switch(field){
150 case TF_DUMMY:
151 g_string_sprintf(query, "INSERT dummy_rec "
152 "SET transaction_id=%ld, "
153 "object_id=%ld ",
154 tr->transaction_id, tr->dummy_id[tr->ndummy-1]);
155 break;
156
157 case TF_STATUS:
158 g_string_sprintf(query, "UPDATE transaction_rec "
159 "SET status=%d "
160 "WHERE transaction_id=%ld ",
161 TR_STATUS(tr->action), tr->transaction_id);
162 break;
163
164 case TF_SAVE:
165 g_string_sprintf(query, "UPDATE transaction_rec "
166 "SET save='%s' "
167 "WHERE transaction_id=%ld ",
168 tr->save, tr->transaction_id);
169 break;
170
171 case TF_ESCRIPT:
172 g_string_sprintf(query, "UPDATE transaction_rec "
173 "SET error_script='%s' "
174 "WHERE transaction_id=%ld ",
175 (tr->error_script)->str, tr->transaction_id);
176 break;
177
178 case TF_ID:
179 g_string_sprintf(query, "UPDATE transaction_rec "
180 "SET object_id=%ld, sequence_id=%ld, serial_id=%ld, succeeded=%d "
181 "WHERE transaction_id=%ld ",
182 tr->object_id, tr->sequence_id, tr->serial_id, tr->succeeded, tr->transaction_id);
183 break;
184
185 case TF_CLEAN:
186 g_string_sprintf(query, "UPDATE transaction_rec "
187 "SET clean=1 "
188 "WHERE transaction_id=%ld ",
189 tr->transaction_id);
190 break;
191
192 default: die; break;
193 }
194
195 sql_err=SQ_execute_query(tr->sql_connection, query->str, &sql_result);
196
197
198 /* in case of an error copy error code and return */
199 if(sql_err) {
200 ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(tr->sql_connection), query->str);
201 die;
202 }
203 g_string_free(query, TRUE);
204 return(tr->transaction_id);
205 }
206
207 /* Query the database for transaction record */
208 /* if there is no record with the specified ID - this is a new transaction */
209 /************************************************************/
210 SQ_result_set_t *tr_get_sql_record(SQ_connection_t *sql_connection, long transaction_id)
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211 {
212 SQ_result_set_t *sql_result;
213 GString *query;
214 int sql_err;
215
216 if ((query = g_string_sized_new(STR_L)) == NULL){
217 ER_perror(FAC_UD, UD_MEM, "cannot allocate gstring\n");
218 die;
219 }
220
221 /* compose query */
222 if (transaction_id == TR_LAST)
223 g_string_sprintf(query, "SELECT * FROM transaction_rec WHERE clean=%d", TCP_UNCLEAN);
224 else
225 g_string_sprintf(query, "SELECT * FROM transaction_rec WHERE transaction_id=%ld", transaction_id);
226
227 /* execute query */
228 sql_err=SQ_execute_query(sql_connection, query->str, &sql_result);
229
230
231 /* in case of an error copy error code and return */
232 if(sql_err) {
233 ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(sql_connection), query->str);
234 die;
235 }
236 g_string_free(query, TRUE);
237 return(sql_result);
238 }
239
240
241 /************************************************************/
242 long tr_get_long(SQ_result_set_t *result, SQ_row_t *row, int col)
/* [<][>][^][v][top][bottom][index][help] */
243 {
244 long val;
245 if( sscanf(SQ_get_column_string_nocopy(result, row, col), "%ld", &val) < 1 ) { die; }
246 return(val);
247 }
248 /************************************************************/
249 int tr_get_int(SQ_result_set_t *result, SQ_row_t *row, int col)
/* [<][>][^][v][top][bottom][index][help] */
250 {
251 int val;
252 if( sscanf(SQ_get_column_string_nocopy(result, row, col), "%d", &val) < 1 ) { die; }
253 return(val);
254 }
255 /************************************************************/
256 char *tr_get_str(SQ_result_set_t *result, SQ_row_t *row, int col)
/* [<][>][^][v][top][bottom][index][help] */
257 {
258 return(SQ_get_column_string_nocopy(result, row, col));
259 }
260 /************************************************************/
261 int tr_get_dummies(Transaction_t *tr)
/* [<][>][^][v][top][bottom][index][help] */
262 {
263 SQ_result_set_t *sql_result;
264 GString *query;
265 int sql_err;
266 SQ_row_t *sql_row;
267
268 if ((query = g_string_sized_new(STR_L)) == NULL){
269 ER_perror(FAC_UD, UD_MEM, "cannot allocate gstring\n");
270 die;
271 }
272
273 /* compose query */
274 g_string_sprintf(query, "SELECT * FROM dummy_rec WHERE transaction_id=%ld", tr->transaction_id);
275 sql_err=SQ_execute_query(tr->sql_connection, query->str, &sql_result);
276
277
278 /* in case of an error copy error code and return */
279 if(sql_err) {
280 ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(tr->sql_connection), query->str);
281 die;
282 }
283 g_string_free(query, TRUE);
284
285 tr->ndummy=0;
286 while ( (sql_row = SQ_row_next(sql_result)) != NULL) {
287 if( sscanf(SQ_get_column_string_nocopy(sql_result, sql_row, DUMMY_OBJECT_ID), "%ld", &(tr->dummy_id[tr->ndummy])) < 1 ) { die; }
288 tr->ndummy++;
289 }
290
291 SQ_free_result(sql_result);
292 return(tr->ndummy);
293 }
294
295 /************************************************************
296 * Transaction_t * TR_get_record() *
297 * *
298 * Get the record left from the failed transaction *
299 * and fill the tr structure *
300 * *
301 * The following fields from transaction are essential: *
302 * *
303 * class_type *
304 * action *
305 * object_id *
306 * sequesnce_id *
307 * save *
308 * ndummy *
309 * dummy_id[] *
310 * error_script *
311 * *
312 * The following fields are filled in by transaction_new() *
313 * thread_upd *
314 * thread_ins *
315 * standalone *
316 *
317 * Return codes: *
318 * *
319 * NULL - everything is clean, no cleanup is needed *
320 * 1 - the database was recovered successfully *
321 * *
322 ************************************************************/
323 Transaction_t *TR_get_record(SQ_connection_t *sql_connection, long transaction_id)
/* [<][>][^][v][top][bottom][index][help] */
324 {
325 Transaction_t *tr;
326 /* get the record from SQL table */
327 SQ_result_set_t *result;
328 SQ_row_t *row;
329 C_Type_t class_type;
330 int res;
331
332
333 result = tr_get_sql_record(sql_connection, transaction_id);
334 if (result == NULL) return (NULL); /* no further actions */
335
336 /* fill in the Transaction structure */
337 if ((row = SQ_row_next(result))== NULL) {
338 tr = NULL;
339 }
340 else {
341 /* Check if there is more than one row */
342 res = 0;
343 while(SQ_row_next(result))res = -1;
344 if(res == -1) die;
345
346
347 class_type = tr_get_class_type(result, row);
348 if ((tr = transaction_new(sql_connection, class_type)) == NULL) die;
349 tr->object_id = tr_get_object_id(result, row);
350
351 /* Fill in all dummies that were created */
352 tr_get_dummies(tr);
353
354 tr->sequence_id = tr_get_sequence_id(result, row);
355 tr->serial_id = tr_get_serial_id(result, row);
356 tr->save = g_strdup(tr_get_save(result, row));
357 g_string_sprintf(tr->error_script, tr_get_escript(result, row));
358
359
360 /* mode of operation */
361 tr->mode = tr_get_mode(result, row);
362 /* indication of success */
363 tr->succeeded = tr_get_success(result, row);
364 /* action is low byte */
365 tr->action = tr_get_action(result, row);
366 /* status is high byte */
367 tr->action |= (tr_get_status(result, row) <<8);
368 tr->action |= (tr_get_clean(result, row) << 8); /* bit0 bears this flag */
369 }
370
371 SQ_free_result(result);
372 return(tr);
373 }
374
375 /************************************************************
376 * int TR_delete_record() *
377 * *
378 * Deletes all associated sql records *
379 * *
380 * *
381 ************************************************************/
382 void TR_delete_record(Transaction_t *tr)
/* [<][>][^][v][top][bottom][index][help] */
383 {
384 GString *query;
385 int sql_err;
386
387 if(tr->load_pass != 0) return; /* for fast loader just return */
388
389 /* Delete a record from SQL DB */
390 if ((query = g_string_sized_new(STR_L)) == NULL){
391 ER_perror(FAC_UD, UD_MEM, "cannot allocate gstring\n");
392 die;
393 }
394
395 /* compose query */
396 g_string_sprintf(query, "DELETE FROM dummy_rec WHERE transaction_id=%ld", tr->transaction_id);
397 sql_err=SQ_execute_query(tr->sql_connection, query->str, NULL);
398 /* in case of an error copy error code and return */
399 if(sql_err) {
400 ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(tr->sql_connection), query->str);
401 die;
402 }
403 g_string_sprintf(query, "DELETE FROM transaction_rec WHERE transaction_id=%ld", tr->transaction_id);
404 sql_err=SQ_execute_query(tr->sql_connection, query->str, NULL);
405 /* in case of an error copy error code and return */
406 if(sql_err) {
407 ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(tr->sql_connection), query->str);
408 die;
409 }
410
411 g_string_free(query, TRUE);
412
413 }
414
415
416 /************************************************************
417 * int TR_recover() *
418 * *
419 * Cleans up the database after RIP daemon failure *
420 * *
421 * Return codes: *
422 * *
423 * 0 - everything is clean, no cleanup is needed *
424 * 1 - the database was recovered successfully *
425 * *
426 ************************************************************/
427 int TR_recover(SQ_connection_t *sql_connection)
/* [<][>][^][v][top][bottom][index][help] */
428 {
429 int res;
430 Transaction_t * tr;
431 char *act_m;
432
433 /* XXX SQ_db_name() ? */
434 fprintf(stderr, "Checking the Database [%s]...", sql_connection->db);
435
436 /* Get the transaction record */
437 /* XXX for NRTM we may specify transaction_id = 0 ? */
438 if ((tr = TR_get_record(sql_connection, TR_LAST)) == NULL) {
439 /* everything is clean */
440 res = 0;
441 fprintf(stderr, "[OK]\n");
442 ER_inf_va(FAC_SV, 0xFFFFFF, "STATUS:[%s]=OK", sql_connection->db);
443 }
444 else {/* Not everything was perfect :( */
445 if(ACT_CREATE(tr->action))act_m="CREATE";
446 else if(ACT_UPDATE(tr->action))act_m="UPDATE";
447 else act_m="DELETE";
448 ER_inf_va(FAC_SV, 0xFFFFFF, "STATUS:[%s]=FAILED [object_id=%ld, sequence_id=%ld, serial_id=%ld, transaction_id=%ld, action=%s]",
449 sql_connection->db, tr->object_id, tr->sequence_id, tr->serial_id, tr->transaction_id, act_m);
450 fprintf(stderr, "[FAILED]\n"
451 "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n"
452 "+ LAST TRANSACTION IS INCOMPLETE. ENTERING CRASH RECOVERY MODE +\n"
453 "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n");
454 /* Failure occured before the ack was sent */
455 /* Roll back the transaction */
456 /* Delete transaction record (TR) as if it never happened */
457 /************************* R O L L B A C K ***************************/
458 if(TS_ROLLBACK(tr->action)) {
459 fprintf(stderr, " STATUS: Rollback\n");
460 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s]=ROLLBACK", sql_connection->db);
461
462 /* don't rollback the transaction if we were to delete the object, but could not */
463 if(!TS_ROLLBACKED(tr->action)){
464 fprintf(stderr, " STATUS: Rollback incomplete, completing...");
465 UD_rollback(tr);
466 CP_ROLLBACK_PASSED(tr->action); TR_update_status(tr);
467 fprintf(stderr, "[OK]\n");
468 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s] Rollback incomplete, completing - OK", sql_connection->db);
469 } else { fprintf(stderr, " STATUS: Rollback complete [PASSED]\n");
470 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s] Rollback complete - PASSED", sql_connection->db);
471 }
472
473
474 if(!TS_ROLLBACKED_NH(tr->action)){
475 fprintf(stderr, " STATUS: NH rollback incomplete, completing...");
476 NH_rollback(tr->sql_connection);
477 CP_ROLLBACK_NH_PASSED(tr->action); TR_update_status(tr);
478 fprintf(stderr, "[OK]\n");
479 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s] NH rollback incomplete, completing - OK", sql_connection->db);
480 } else { fprintf(stderr, " STATUS: NH rollback complete [PASSED]\n");
481 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s] NH rollback complete - PASSED", sql_connection->db);
482 }
483 /* In update mode delete TR record. Next time (if any) DBupdate tries to submit, we'll start from scratch */
484 /* In NRTM mode we create a serial record even in case of failure (tr->succeeded ==0)*/
485 /* So in NRTM we need to clean up serials/transaction as well */
486 if(IS_UPDATE(tr->mode)){
487 fprintf(stderr, " STATUS: Serial does not need to be restored, deleting TR...");
488 TR_delete_record(tr);
489 fprintf(stderr, "[OK]\n");
490 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s] Serial does not need to be restored, deleting TR - OK", sql_connection->db);
491 } else {
492 fprintf(stderr, " STATUS: Cleaning serial, deleting TR...");
493 if(!TS_CREATED_S(tr->action))
494 UD_rollback_serial(tr);
495 else
496 UD_commit_serial(tr);
497 TR_delete_record(tr);
498 fprintf(stderr, "[OK]\n");
499 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s] Cleaning serial, deleting TR - OK", sql_connection->db);
500 }
501
502 res = 1;
503 }
504 /************************* C O M M I T ******************************/
505 else { /* commit */
506 /* The ack was sent */
507 /* Complete the commit */
508 fprintf(stderr, " STATUS: Commit\n");
509 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s]=COMMIT", sql_connection->db);
510 /* We keep the transaction record in case DBupdate failed */
511 /* and requests the same transaction after recovery ? */
512 /* Such approach will allow us to avoid 3-way handshaking with DBupdate */
513 /* So we never blocked or timed out during that phase */
514
515 /* XXX But first I implemented another approach (to keep DB tiny/tidy): */
516 /* 1. Process the transaction */
517 /* 2. In case of failure - rollback - NACK */
518 /* 3. Before commit - ACK (UD_ack()) */
519 /* 4. If UD_ack returns an error preserve a tr_record */
520 /* 5. Commit */
521 /* 6. If still alive and UD_ack passed - delete the record - all is clean */
522 /* Otherwise preserve a tr_record */
523
524 if(ACT_DELETE(tr->action)) {
525 /* check if we passed deletion process */
526 if(!TS_DELETED(tr->action)){
527 fprintf(stderr, " STATUS: Delete incomplete, completing...");
528 UD_delete(tr);
529 CP_DELETE_PASSED(tr->action); TR_update_status(tr);
530 fprintf(stderr, "[OK]\n");
531 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s] Delete incomplete, completing - OK", sql_connection->db);
532 } else { fprintf(stderr, " STATUS: Delete complete [PASSED]\n");
533 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s] Delete complete - PASSED", sql_connection->db);
534 }
535 }
536 else { /* update or create */
537 /* Check if we passed the deletion pass of commit */
538 if(!TS_COMMITTED_I(tr->action)){
539 fprintf(stderr, " STATUS: Commit phase I incomplete, completing...");
540 UD_commit_I(tr);
541 CP_COMMIT_I_PASSED(tr->action); TR_update_status(tr);
542 fprintf(stderr, "[OK]\n");
543 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s] Commit phase I incomplete, completing - OK", sql_connection->db);
544 } else { fprintf(stderr, " STATUS: Commit phase I complete [PASSED]\n");
545 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s] Commit phase I complete - PASSED", sql_connection->db);
546 }
547 /* Check if we passed the second pass of commit */
548 if(!TS_COMMITTED_II(tr->action)){
549 fprintf(stderr, " STATUS: Commit phase II incomplete, completing...");
550 UD_commit_II(tr);
551 CP_COMMIT_II_PASSED(tr->action); TR_update_status(tr);
552 fprintf(stderr, "[OK]\n");
553 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s] Commit phase II incomplete, completing - OK", sql_connection->db);
554 } else { fprintf(stderr, " STATUS: Commit phase II complete [PASSED]\n");
555 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s] Commit phase II complete - PASSED", sql_connection->db);
556 }
557 } /* end of delete, create, update specific operations */
558
559 /* Check if we passed the NH repository commit */
560 if(!TS_COMMITTED_NH(tr->action)){
561 fprintf(stderr, " STATUS: NH commit incomplete, completing...");
562 NH_commit(tr->sql_connection);
563 CP_COMMIT_NH_PASSED(tr->action); TR_update_status(tr);
564 fprintf(stderr, "[OK]\n");
565 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s] NH commit incomplete, completing - OK", sql_connection->db);
566 } else { fprintf(stderr, " STATUS: NH commit complete [PASSED]\n");
567 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s] NH commit complete - PASSED", sql_connection->db);
568 }
569
570 /* create serial file */
571 if(!TS_CREATED_S(tr->action))
572 {
573 fprintf(stderr, " STATUS: Serial rollback and restore...");
574 UD_rollback_serial(tr);
575 if(ACT_UPD_CLLPS(tr->action)) { /* this is a collapsed update (DEL + ADD) */
576 tr->action=TA_DELETE; UD_create_serial(tr);
577 tr->sequence_id++;
578 tr->action=TA_CREATE; UD_create_serial(tr);
579 }else if(ACT_UPD_DUMMY(tr->action)) { /* this was a dummy update - we need only CREATE serial */
580 tr->action=TA_CREATE;
581 tr->sequence_id++; /* because in fact this is an update (sequence_id=2) */
582 UD_create_serial(tr);
583 } else UD_create_serial(tr);
584 CP_CREATE_S_PASSED(tr->action); TR_update_status(tr);
585 }
586 fprintf(stderr, "[OK]\n");
587 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s] Serial rollback and restore - OK", sql_connection->db);
588 UD_commit_serial(tr);
589
590 fprintf(stderr, " STATUS: Marking TR as clean...");
591 TR_mark_clean(tr);
592
593 fprintf(stderr, "[OK]\n");
594 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s] Marking TR as clean - OK", sql_connection->db);
595 res = 2;
596 }
597 }
598 transaction_free(tr);
599 fprintf(stderr, " STATUS: The Database is clean \n++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n\n");
600 ER_inf_va(FAC_SV, 0xFFFFFF,"STATUS:[%s]=CLEAN", sql_connection->db);
601
602 return(res);
603 }
604
605 /************************************************************
606 * int TR_check() *
607 * *
608 * Checks if the requested transaction has already been *
609 * processed. This could happen when DBupdate crashes while *
610 * RIPupdate successfully completes the transaction. *
611 * *
612 * If this is the case, RIPupdate will return an ack to *
613 * DBupdate as if the transaction was processed again *
614 * *
615 * Return codes: *
616 * 0 - everything is clean - this is a new transaction *
617 * 1 - the stored transaction was re-played *
618 * *
619 ************************************************************/
620 int TR_check(SQ_connection_t *sql_connection, long transaction_id, int sockfd)
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621 {
622 Transaction_t * tr;
623
624
625 /* transaction_id == 0 means that only one record is maintained */
626 /* therefore it is not possible to replay the transaction */
627 /* and transaction_id does not uniquely identify the transaction */
628 /* suitable for NRTM and for backwards compatibility */
629 if(transaction_id <=0) return(0);
630 /* Get the transaction record */
631 /* XXX for NRTM we may specify transaction_id = 0 ? */
632 if ((tr = TR_get_record(sql_connection, transaction_id)) == NULL) return(0); /* everything is clean */
633
634 /* Check if the record is clean (it should be ) */
635 /* that means that either the transaction finished normally */
636 /* or crash recovery procedure cleaned up the database (and record as well ) */
637 if (TS_CLEAN(tr->action)) {
638 /* send an acknowledgement */
639 /* XXX Wait for ack */
640 /* XXX if ack is timed out just return, else delete the tr_record */
641 /* if(UD_ack(tr)==0) TR_delete_record(tr); */
642
643 /* Send an acknowledgement, append note that transaction was rerun */
644 tr->socket=sockfd;
645 g_string_sprintfa(tr->error_script,"I[%ld]: requested transaction was processed before\n", transaction_id);
646 UD_ack(tr);
647 ER_inf_va(FAC_UD, ASP_UD_UPDLOG, "[%ld] requested transaction was processed before\n", transaction_id);
648 transaction_free(tr);
649 }
650 else {
651 ER_perror(FAC_UD, UD_SQL, "TR is not clean\n");
652 die; /* the record should be clean */
653 }
654 return(1);
655 }
656
657