Source File ud/ud_serial.c

    1    | /***************************************
    2    |
    3    |   Functions for handling serials
    4    |
    5    |   Status: NOT REVUED, NOT TESTED
    6    |
    7    |  Author(s):       Andrei Robachevsky
    8    |
    9    |   ******************/ /******************
    10   |   Modification History:
    11   |         andrei (08/02/2000) Created.
    12   |   ******************/ /******************
    13   |   Copyright (c) 2000,2001,2002                    RIPE NCC
    14   |
    15   |   All Rights Reserved
    16   |
    17   |   Permission to use, copy, modify, and distribute this software and its
    18   |   documentation for any purpose and without fee is hereby granted,
    19   |   provided that the above copyright notice appear in all copies and that
    20   |   both that copyright notice and this permission notice appear in
    21   |   supporting documentation, and that the name of the author not be
    22   |   used in advertising or publicity pertaining to distribution of the
    23   |   software without specific, written prior permission.
    24   |
    25   |   THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
    26   |   ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS; IN NO EVENT SHALL
    27   |   AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
    28   |   DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
    29   |   AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    30   |   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
    31   |  ***************************************/
    32   |
    33   | #include "rip.h"
    34   |
    35   | /************************************************************
    36   | * int UD_lock/unlock_serial()                               *
    37   | *                                                           *
    38   | * Performs lockind/unlocking of the relevant tables         *
    39   | *                                                           *
    40   | * Returns:                                                  *
    41   | * 0 - success                                               *
    42   | * Non-zero if error occured (XXX dies now)                  *
    43   | *                                                           *
    44   | ************************************************************/
    45   | int UD_lock_serial(Transaction_t *tr)
    46   | {
    47   | int sql_err;
    48   |
    49   | /* lock all tables we are going to update and commit */
    50   | /* this also includes transaction_rec table, as we update the status */
    51   |    sql_err=SQ_execute_query(tr->sql_connection, "LOCK TABLES serials WRITE, failed_transaction WRITE, transaction_rec WRITE ", NULL);
    52   |    if (sql_err) {
    53   | 	ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(tr->sql_connection), "LOCK TABLES serials WRITE, failed_transaction WRITE, transaction_rec WRITE ");
    54   |         die;
    55   |     }
    56   |  return(sql_err);
    57   | }
    58   |
    59   | int UD_unlock_serial(Transaction_t *tr)
    60   | {
    61   | int sql_err;
    62   |
    63   |    sql_err=SQ_execute_query(tr->sql_connection, "UNLOCK TABLES ", NULL);
    64   |    if (sql_err) {
    65   | 	ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(tr->sql_connection), "UNLOCK TABLES");
    66   |         die;
    67   |     }
    68   |  return(sql_err);
    69   | }
    70   |
    71   |
    72   | /************************************************************
    73   | * UD_create_serial()                                        *
    74   | *                                                           *
    75   | * Creates a serial record for given transaction             *
    76   | *                                                           *
    77   | * Important fields of transaction are:                      *
    78   | * tr->action        TR_CREATE/TR_UPDATE/TR_DELETE           *
    79   | * tr->object_id     should be filled in                     *
    80   | * tr->sequence_id   should be set to object updated         *
    81   | *                                                           *
    82   | * So given object with id=k and seq=n                       *
    83   | * Create:  ADD(k,n)                                         *
    84   | * Update:  ~S(k,n), ADD(k,n+1)                              *
    85   | * Delete:  ~S(k,n), DEL(k,n)                                *
    86   | *                                                           *
    87   | * Returns:                                                  *
    88   | *  current serial number.                                    *
    89   | *  -1 in case of an error                                   *
    90   | *                                                           *
    91   | *************************************************************/
    92   |
    93   | long UD_create_serial(Transaction_t *tr)
    94   | {
    95   | int sql_err;
    96   | int operation;
    97   | long timestamp;
    98   | long sequence_id;
    99   |
    100  |  /* Calculate the object_id - should be max+1 */
    101  |  /* XXX we cannot use autoincrement with MyISAM tables */
    102  |  /* XXX because they keep the max inserted id even if  */
    103  |  /* XXX it was deleted later, thus causing gaps we don't want */
    104  |     tr->serial_id = SQ_get_max_id(tr->sql_connection, "serial_id", "serials") +1;
    105  |
    106  |   /* if the transaction failed store it in transaction table */
    107  |   if(tr->succeeded==0){
    108  |     if(ACT_DELETE(tr->action))operation=OP_DEL; else operation=OP_ADD;
    109  |
    110  |     g_string_sprintf(tr->query, "INSERT serials SET "
    111  |                    "thread_id=%d, serial_id=%ld, object_id=%ld, sequence_id=0, "
    112  | 		   "atlast=2, "
    113  | 		   "operation=%d ", tr->thread_ins, tr->serial_id, tr->object_id, operation);
    114  |
    115  |     sql_err = SQ_execute_query(tr->sql_connection, tr->query->str, (SQ_result_set_t **)NULL);
    116  |
    117  |     if (sql_err) {
    118  | 	ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(tr->sql_connection), tr->query->str);
    119  | 	die;
    120  |     }
    121  |     else {
    122  |        timestamp=time(NULL);
    123  |        g_string_sprintf(tr->query, "INSERT failed_transaction SET "
    124  |                    "thread_id=%d, serial_id=%ld, timestamp=%ld, "
    125  | 		   "object='%s' ", tr->thread_ins, tr->serial_id, timestamp, tr->object_txt);
    126  |        /* make a record in transaction table */
    127  |        sql_err = SQ_execute_query(tr->sql_connection, tr->query->str, (SQ_result_set_t **)NULL);
    128  |        if (sql_err) {
    129  | 	 ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(tr->sql_connection), tr->query->str);
    130  | 	 die;
    131  |        }
    132  |     }
    133  |     return(tr->serial_id);
    134  |   }
    135  |
    136  |
    137  |   /* if the transaction has succeeded */
    138  |   sequence_id=tr->sequence_id;
    139  |   /* If this is an update or delete */
    140  |   if(!ACT_CREATE(tr->action)) {
    141  |     /* Increase the sequence_id so we insert correct ADD serial in case of Update */
    142  |     sequence_id=tr->sequence_id + 1;
    143  |
    144  |     /* set the atlast field of the latest record for this object to 0 */
    145  |     /* because it is moved to history */
    146  |     g_string_sprintf(tr->query, "UPDATE serials SET atlast=0, thread_id=%d "
    147  |                    "WHERE object_id=%ld "
    148  |                    "AND sequence_id=%ld ", tr->thread_upd, tr->object_id, sequence_id-1);
    149  |
    150  |     sql_err = SQ_execute_query(tr->sql_connection, tr->query->str, (SQ_result_set_t **)NULL);
    151  |     if (sql_err) { // we can have empty updates, but not errors
    152  | 	ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(tr->sql_connection), tr->query->str);
    153  | 	die;
    154  |     }
    155  |   }
    156  |   /* XXX below is a code for protocol v2, where updates are atomic */
    157  |   /* XXX this is fine (and should always be used) for NRTM, since we */
    158  |   /* XXX store failed transactions and playback stream exactly as it comes */
    159  |   /* XXX However, for update this may be configurable option */
    160  |   /* XXX In case v1 protocol both sections (DEL + ADD) should be executed */
    161  |
    162  |   /* get the next serial_id */
    163  |   /* XXX we cannot use autoincrement with MyISAM tables */
    164  |   /* XXX because they keep the max inserted id even if  */
    165  |   /* XXX it was deleted later, thus causing gaps we don't want */
    166  |   tr->serial_id = SQ_get_max_id(tr->sql_connection, "serial_id", "serials") +1;
    167  |
    168  |   /* if this a DEL */
    169  |
    170  |
    171  |   if(ACT_DELETE(tr->action)) {
    172  |     /* generate DEL serial */
    173  |
    174  |     g_string_sprintf(tr->query, "INSERT serials SET "
    175  |                    "thread_id=%d, serial_id=%ld, object_id=%ld, "
    176  |                    "sequence_id=%ld, "
    177  |                    "atlast=0, "
    178  |                    "operation=%d ", tr->thread_ins, tr->serial_id, tr->object_id, sequence_id-1, OP_DEL);
    179  |
    180  |     sql_err = SQ_execute_query(tr->sql_connection, tr->query->str, (SQ_result_set_t **)NULL);
    181  |     if (sql_err) {
    182  | 	ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(tr->sql_connection), tr->query->str);
    183  | 	die;
    184  |     }
    185  |
    186  |   }
    187  |   else { /* otherwise this is an ADD */
    188  |
    189  |    /* now insert creation serial */
    190  |    g_string_sprintf(tr->query, "INSERT serials SET "
    191  |                   "thread_id=%d, serial_id=%ld, object_id=%ld, "
    192  |                   "sequence_id=%ld, "
    193  |                   "atlast=1, "
    194  |                   "operation=%d ", tr->thread_ins, tr->serial_id, tr->object_id, sequence_id, OP_ADD);
    195  |
    196  |    sql_err = SQ_execute_query(tr->sql_connection, tr->query->str, (SQ_result_set_t **)NULL);
    197  |    if (sql_err) {
    198  | 	ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(tr->sql_connection), tr->query->str);
    199  | 	die;
    200  |    }
    201  |
    202  |   }
    203  |   return(tr->serial_id);
    204  | }
    205  | /************************************************************
    206  | * UD_comrol_serial()                                        *
    207  | *                                                           *
    208  | * Commits/Rollbacks a serial record for given transaction   *
    209  | * Returns:                                                  *
    210  | * 0 in success                                              *
    211  | *  -1 in case of an error                                   *
    212  | *                                                           *
    213  | *************************************************************/
    214  |
    215  | char *Q_rollback_serial1="DELETE FROM serials WHERE thread_id=%ld ";
    216  | char *Q_rollback_serial2="UPDATE serials SET atlast=1, thread_id=0 WHERE thread_id=%ld ";
    217  | char *Q_rollback_transaction="DELETE FROM failed_transaction WHERE thread_id=%ld ";
    218  | char *Q_commit_serial="UPDATE serials SET thread_id=0 WHERE thread_id=%ld OR thread_id=%ld ";
    219  | char *Q_commit_transaction="UPDATE failed_transaction SET thread_id=0 WHERE thread_id=%ld ";
    220  |
    221  |
    222  |
    223  | int UD_comrol_serial(Transaction_t *tr, int commit)
    224  | {
    225  | int sql_err;
    226  | char *Q_transaction;
    227  |
    228  |    /* check if something is left in serials from the crash */
    229  |
    230  |    /* compose the appropriate query depending on operation (commit/rollback) */
    231  |    if(commit) {
    232  | 	   /* commit changes to serials table */
    233  | 	   g_string_sprintf(tr->query, Q_commit_serial, tr->thread_ins, tr->thread_upd);
    234  | 	   sql_err = SQ_execute_query(tr->sql_connection, tr->query->str, (SQ_result_set_t **)NULL);
    235  |            if (sql_err) {
    236  | 	     ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(tr->sql_connection), tr->query->str);
    237  |              die;
    238  |            }
    239  | 	   Q_transaction=Q_commit_transaction;
    240  |    } else {
    241  | 	   /* delete new insertions */
    242  | 	   g_string_sprintf(tr->query, Q_rollback_serial1, tr->thread_ins);
    243  | 	   sql_err = SQ_execute_query(tr->sql_connection, tr->query->str, (SQ_result_set_t **)NULL);
    244  |            if (sql_err) {
    245  | 	     ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(tr->sql_connection), tr->query->str);
    246  |              die;
    247  |            }
    248  | 	   /* restore modified atlast */
    249  |            g_string_sprintf(tr->query, Q_rollback_serial2, tr->thread_upd);
    250  | 	   sql_err = SQ_execute_query(tr->sql_connection, tr->query->str, (SQ_result_set_t **)NULL);
    251  |            if (sql_err) {
    252  | 	     ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(tr->sql_connection), tr->query->str);
    253  |              die;
    254  |            }
    255  | 	   Q_transaction=Q_rollback_transaction;
    256  |    }
    257  |
    258  |     /* clean up transaction  table */
    259  |     g_string_sprintf(tr->query, Q_transaction, tr->thread_ins);
    260  |     sql_err = SQ_execute_query(tr->sql_connection, tr->query->str, (SQ_result_set_t **)NULL);
    261  |     if (sql_err) {
    262  | 	ER_perror(FAC_UD, UD_SQL, "%s[%s]\n", SQ_error(tr->sql_connection), tr->query->str);
    263  |         die;
    264  |     }
    265  |  return(0);
    266  | }
    267  |
    268  |