/[rserv]/lib/rserv.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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revision 1.2 by dpavlin, Tue Aug 5 09:52:39 2003 UTC revision 1.4 by dpavlin, Tue Oct 28 18:43:15 2003 UTC
# Line 3  Line 3 
3   * (c) 2000 Vadim Mikheev, PostgreSQL Inc.   * (c) 2000 Vadim Mikheev, PostgreSQL Inc.
4   */   */
5    
6  #include "executor/spi.h"               /* this is what you need to work with SPI */  #include "executor/spi.h"       /* this is what you need to work with SPI */
7  #include "commands/trigger.h"   /* -"- and triggers */  #include "commands/trigger.h"   /* -"- and triggers */
8  #include "utils/tqual.h"                /* -"- and SnapshotData */  #include "utils/tqual.h"        /* -"- and SnapshotData */
9  #include <ctype.h>                              /* tolower () */  #include <ctype.h>              /* tolower () */
10    
11  #ifdef PG_FUNCTION_INFO_V1  #ifdef PG_FUNCTION_INFO_V1
12  #define CurrentTriggerData ((TriggerData *) fcinfo->context)  #define CurrentTriggerData ((TriggerData *) fcinfo->context)
# Line 31  static int     debug = 0; Line 31  static int     debug = 0;
31  static char *OutputValue(char *key, char *buf, int size);  static char *OutputValue(char *key, char *buf, int size);
32    
33  #ifdef PG_FUNCTION_INFO_V1  #ifdef PG_FUNCTION_INFO_V1
34  Datum _rserv_log_(PG_FUNCTION_ARGS)  Datum
35    _rserv_log_(PG_FUNCTION_ARGS)
36  #else  #else
37  HeapTuple _rserv_log_()  HeapTuple
38    _rserv_log_()
39  #endif  #endif
40  {  {
41    Trigger    *trigger;          /* to get trigger name */          Trigger    *trigger;            /* to get trigger name */
42    int           nargs;                  /* # of args specified in CREATE TRIGGER */          int                     nargs;                  /* # of args specified in CREATE TRIGGER */
43    char    **args;                       /* argument: argnum */          char      **args;                       /* argument: argnum */
44    Relation      rel;                    /* triggered relation */          Relation        rel;                    /* triggered relation */
45    HeapTuple     tuple;                  /* tuple to return */          HeapTuple       tuple;                  /* tuple to return */
46    HeapTuple     newtuple = NULL;        /* tuple to return */          HeapTuple       newtuple = NULL;        /* tuple to return */
47    TupleDesc     tupdesc;                /* tuple description */          TupleDesc       tupdesc;                /* tuple description */
48    int                   keynum;          int                     keynum;
49    char     *key;          char       *key;
50    char     *okey;          char       *okey;
51    char     *newkey = NULL;          char       *newkey = NULL;
52    int                   deleted, inserted, updated;          int                     deleted, inserted, updated;
53    char          sql[8192];          char            sql[8192];
54    char          outbuf[8192];          char            outbuf[8192];
55    char          oidbuf[64];          char            oidbuf[64];
56    int                   ret;          int                     ret;
57            int             server;
58    /* Called by trigger manager ? */  
59    if (!CurrentTriggerData)          /* Called by trigger manager ? */
60      elog(ERROR, "_rserv_log_: triggers are not initialized");          if (!CurrentTriggerData)
61                      elog(ERROR, "_rserv_log_: triggers are not initialized");
62    /* Should be called for ROW trigger */  
63    if (TRIGGER_FIRED_FOR_STATEMENT(CurrentTriggerData->tg_event))          /* Should be called for ROW trigger */
64      elog(ERROR, "_rserv_log_: can't process STATEMENT events");          if (TRIGGER_FIRED_FOR_STATEMENT(CurrentTriggerData->tg_event))
65                    elog(ERROR, "_rserv_log_: can't process STATEMENT events");
66    tuple = CurrentTriggerData->tg_trigtuple;  
67            tuple = CurrentTriggerData->tg_trigtuple;
68    trigger = CurrentTriggerData->tg_trigger;  
69    nargs = trigger->tgnargs;          trigger = CurrentTriggerData->tg_trigger;
70    args = trigger->tgargs;          nargs = trigger->tgnargs;
71            args = trigger->tgargs;
72    if (nargs != 1)                               /* odd number of arguments! */  
73      elog(ERROR, "_rserv_log_: need in *one* argument");          if (nargs != 2)                         /* odd number of arguments! */
74                      elog(ERROR, "_rserv_log_: need in *two* arguments, key number and server number");
75    keynum = atoi(args[0]);  
76              keynum = atoi(args[0]);
77    if (keynum < 0 && keynum != ObjectIdAttributeNumber)          server = atoi(args[1]);
78      elog(ERROR, "_rserv_log_: invalid keynum %d", keynum);  
79              if (keynum < 0 && keynum != ObjectIdAttributeNumber)
80    rel = CurrentTriggerData->tg_relation;                  elog(ERROR, "_rserv_log_: invalid keynum %d", keynum);
81    tupdesc = rel->rd_att;  
82              rel = CurrentTriggerData->tg_relation;
83    deleted  = (TRIGGER_FIRED_BY_DELETE(CurrentTriggerData->tg_event)) ? 1 : 0;          tupdesc = rel->rd_att;
84    inserted = (TRIGGER_FIRED_BY_INSERT(CurrentTriggerData->tg_event)) ? 1 : 0;  
85    //  updated  = (TRIGGER_FIRED_BY_UPDATE(CurrentTriggerData->tg_event)) ? 1 : 0;          deleted = (TRIGGER_FIRED_BY_DELETE(CurrentTriggerData->tg_event)) ?
86                    1 : 0;
87    updated = 0;  
88    if (TRIGGER_FIRED_BY_UPDATE(CurrentTriggerData->tg_event)) {          inserted = (TRIGGER_FIRED_BY_INSERT(CurrentTriggerData->tg_event)) ? 1 : 0;
89      updated = 1;  
90      newtuple = CurrentTriggerData->tg_newtuple;          updated = 0;
91    }          if (TRIGGER_FIRED_BY_UPDATE(CurrentTriggerData->tg_event)) {
92                    updated = 1;
93                    newtuple = CurrentTriggerData->tg_newtuple;
94            }
95    
96  #ifndef PG_FUNCTION_INFO_V1  #ifndef PG_FUNCTION_INFO_V1
97      
98    /*          /*
99     * Setting CurrentTriggerData to NULL prevents direct calls to trigger           * Setting CurrentTriggerData to NULL prevents direct calls to trigger
100     * functions in queries. Normally, trigger functions have to be called           * functions in queries. Normally, trigger functions have to be called
101     * by trigger manager code only.           * by trigger manager code only.
102     */           */
103    CurrentTriggerData = NULL;          CurrentTriggerData = NULL;
104  #endif  #endif
     
   /* Connect to SPI manager */  
   if ((ret = SPI_connect()) < 0)  
     elog(ERROR, "_rserv_log_: SPI_connect returned %d", ret);  
     
   if (keynum == ObjectIdAttributeNumber) {  
     sprintf(oidbuf, "%u", tuple->t_data->t_oid);  
     key = oidbuf;  
   } else {  
     key = SPI_getvalue(tuple, tupdesc, keynum);  
   }  
   
   if (key == NULL)  
     elog(ERROR, "_rserv_log_: key must be not null");  
     
   if (newtuple && keynum != ObjectIdAttributeNumber) {  
     newkey = SPI_getvalue(newtuple, tupdesc, keynum);  
     if (newkey == NULL)  
       elog(ERROR, "_rserv_log_: key must be not null");  
     if (strcmp(newkey, key) == 0)  
       newkey = NULL;  
     else  
       deleted = 1;              /* old key was deleted */  
   }  
     
   if (strpbrk(key, "\\  \n'"))  
     okey = OutputValue(key, outbuf, sizeof(outbuf));  
   else  
     okey = key;  
   
   
   /**  
      versao onde verifica-se primeiro se o registro existe  
      para decidir se faz insert ou update em _RSERV_LOG_  
   **********************/  
   
 #ifdef ASKFORUPDATE  
   sprintf(sql, "SELECT true WHERE EXISTS (SELECT logid from _RSERV_LOG_ "  
           "WHERE reloid = %u AND key = '%s')",  
           rel->rd_id, okey);  
   
   if (debug)  
     elog(NOTICE, sql);  
   
   if ((ret = SPI_exec(sql, 1)) < 0) {  
     elog(ERROR, "_rserv_log_: SPI_exec(update) returned %d", ret);  
   }  
   
   if (SPI_processed > 0) {  
     sprintf(sql, "update _RSERV_LOG_ set logid = %d, logtime = now(), "  
             "insert = %d, update = %d, delete = %d where reloid = %u "  
             "and key = '%s'",  
             GetCurrentTransactionId(),  
             inserted, updated, deleted, rel->rd_id, okey);  
       
     if (debug)  
       elog(NOTICE, sql);  
       
     ret = SPI_exec(sql, 0);  
       
     if (ret < 0)  
       elog(ERROR, "_rserv_log_: SPI_exec(update) returned %d", ret);  
       
     if (SPI_processed > 1)  
       elog(ERROR, "_rserv_log_: duplicate tuples");  
   } else {  
     sprintf(sql, "insert into _RSERV_LOG_ "  
             "(reloid, logid, logtime, insert, update, delete, key) "  
             "values (%u, %d, now(), %d, %d, %d, '%s')",  
             rel->rd_id, GetCurrentTransactionId(),  
             inserted, updated, deleted, okey);  
       
     if (debug)  
       elog(NOTICE, sql);  
       
     ret = SPI_exec(sql, 0);  
       
     if (ret < 0)  
       elog(ERROR, "_rserv_log_: SPI_exec(insert) returned %d", ret);  
   }  
105    
106  #else          /* Connect to SPI manager */
107            if ((ret = SPI_connect()) < 0)
108    sprintf(sql, "update _RSERV_LOG_ set logid = %d, logtime = now(), "                  elog(ERROR, "_rserv_log_: SPI_connect returned %d", ret);
109            "insert = %d, update = %d, delete = %d where reloid = %u "  
110            "and key = '%s'",          if (keynum == ObjectIdAttributeNumber)
111            GetCurrentTransactionId(),          {
112            inserted, updated, deleted, rel->rd_id, okey);                  snprintf(oidbuf, sizeof(oidbuf), "%u", HeapTupleGetOid(tuple));
113                      key = oidbuf;
114    if (debug)          }
115      elog(NOTICE, sql);          else
116                      key = SPI_getvalue(tuple, tupdesc, keynum);
117    ret = SPI_exec(sql, 0);  
118              if (key == NULL)
119    if (ret < 0)                  elog(ERROR, "_rserv_log_: key must be not null");
120      elog(ERROR, "_rserv_log_: SPI_exec(update) returned %d", ret);  
121              if (newtuple && keynum != ObjectIdAttributeNumber)
122              {
123    /*                  newkey = SPI_getvalue(newtuple, tupdesc, keynum);
124     * If no tuple was UPDATEd then do INSERT...                  if (newkey == NULL)
125     */                          elog(ERROR, "_rserv_log_: key must be not null");
126                    if (strcmp(newkey, key) == 0)
127                              newkey = NULL;
128    if (SPI_processed > 1)                  else
129      elog(ERROR, "_rserv_log_: duplicate tuples");                          deleted = 1;            /* old key was deleted */
130    else if (SPI_processed == 0) {          }
131      sprintf(sql, "insert into _RSERV_LOG_ "  
132              "(reloid, logid, logtime, insert, update, delete, key) "          if (strpbrk(key, "\\    \n'"))
133              "values (%u, %d, now(), %d, %d, %d, '%s')",                  okey = OutputValue(key, outbuf, sizeof(outbuf));
134              rel->rd_id, GetCurrentTransactionId(),          else
135              inserted, updated, deleted, okey);                  okey = key;
136        
137      if (debug)          snprintf(sql, 8192, "update _RSERV_LOG_ set logid = %d, logtime = now(), "
138        elog(NOTICE, sql);                          "insert = %d, update = %d, delete = %d where reloid = %u and key = '%s'",
139                                GetCurrentTransactionId(), inserted, updated, deleted, rel->rd_id, okey);
140      ret = SPI_exec(sql, 0);  
141                if (debug)
142      if (ret < 0)                  elog(DEBUG3, "sql: %s", sql);
143        elog(ERROR, "_rserv_log_: SPI_exec(insert) returned %d", ret);  
144    }          ret = SPI_exec(sql, 0);
145      
146  #endif              if (ret < 0)
147                    elog(ERROR, "_rserv_log_: SPI_exec(update) returned %d", ret);
148    if (okey != key && okey != outbuf)  
149      pfree(okey);          /*
150               * If no tuple was UPDATEd then do INSERT...
151    if (newkey) {           */
152      if (strpbrk(newkey, "\\     \n'"))          if (SPI_processed > 1)
153        okey = OutputValue(newkey, outbuf, sizeof(outbuf));                  elog(ERROR, "_rserv_log_: duplicate tuples");
154      else          else if (SPI_processed == 0)
155        okey = newkey;          {
156                        snprintf(sql, 8192, "insert into _RSERV_LOG_ "
157      sprintf(sql, "insert into _RSERV_LOG_ "                                  "(reloid, logid, logtime, insert, update, delete, key, server) "
158              "(reloid, logid, logtime, insert, update, delete, key) "                                  "values (%u, %d, now(), %d, %d, %d, '%s', %d)",
159              "values (%u, %d, now(), %d, %d, 0, '%s')",                                   rel->rd_id, GetCurrentTransactionId(),
160              rel->rd_id, GetCurrentTransactionId(), inserted, updated, okey);                                  inserted, updated, deleted, okey, server);
161        
162      if (debug)                  if (debug)
163        elog(NOTICE, sql);                          elog(DEBUG3, "sql: %s", sql);
164        
165      ret = SPI_exec(sql, 0);                  ret = SPI_exec(sql, 0);
166        
167      if (ret < 0)                  if (ret < 0)
168        elog(ERROR, "_rserv_log_: SPI_exec returned %d", ret);                          elog(ERROR, "_rserv_log_: SPI_exec(insert) returned %d", ret);
169                }
170      if (okey != newkey && okey != outbuf)  
171        pfree(okey);          if (okey != key && okey != outbuf)
172    }                  pfree(okey);
173      
174    SPI_finish();          if (newkey)
175              {
176                    if (strpbrk(newkey, "\\ \n'"))
177                            okey = OutputValue(newkey, outbuf, sizeof(outbuf));
178                    else
179                            okey = newkey;
180    
181                    snprintf(sql, 8192, "insert into _RSERV_LOG_ "
182                                     "(reloid, logid, logtime, insert, update, deleted, key, server) "
183                                     "values (%u, %d, now(), %d, %d, 0, '%s', %d)",
184                                     rel->rd_id, GetCurrentTransactionId(), inserted, updated, okey, server);
185    
186                    if (debug)
187                            elog(DEBUG3, "sql: %s", sql);
188    
189                    ret = SPI_exec(sql, 0);
190    
191                    if (ret < 0)
192                            elog(ERROR, "_rserv_log_: SPI_exec returned %d", ret);
193    
194                    if (okey != newkey && okey != outbuf)
195                            pfree(okey);
196            }
197    
198            SPI_finish();
199    
200  #ifdef PG_FUNCTION_INFO_V1  #ifdef PG_FUNCTION_INFO_V1
201    return (PointerGetDatum(tuple));          return (PointerGetDatum(tuple));
202  #else  #else
203    return (tuple);          return (tuple);
204  #endif  #endif
205  }  }
206    
# Line 278  _rserv_sync_(int32 server) Line 227  _rserv_sync_(int32 server)
227          buf[0] = 0;          buf[0] = 0;
228          for (xcnt = 0; xcnt < SerializableSnapshot->xcnt; xcnt++)          for (xcnt = 0; xcnt < SerializableSnapshot->xcnt; xcnt++)
229          {          {
230                  sprintf(buf + strlen(buf), "%s%u", (xcnt) ? ", " : "",                  snprintf(buf + strlen(buf), 8192 - strlen(buf),
231                                  SerializableSnapshot->xip[xcnt]);                                   "%s%u", (xcnt) ? ", " : "",
232                                     SerializableSnapshot->xip[xcnt]);
233          }          }
234    
235          if ((ret = SPI_connect()) < 0)          if ((ret = SPI_connect()) < 0)
236                  elog(ERROR, "_rserv_sync_: SPI_connect returned %d", ret);                  elog(ERROR, "_rserv_sync_: SPI_connect returned %d", ret);
237    
238          sprintf(sql, "insert into _RSERV_SYNC_ "          snprintf(sql, 8192, "insert into _RSERV_SYNC_ "
239                          "(server, syncid, synctime, status, minid, maxid, active) "                           "(server, syncid, synctime, status, minid, maxid, active) "
240            "values (%u, currval('_rserv_sync_seq_'), now(), 0, %d, %d, '%s')",            "values (%u, currval('_rserv_sync_seq_'), now(), 0, %d, %d, '%s')",
241                          server, SerializableSnapshot->xmin, SerializableSnapshot->xmax, active);                           server, SerializableSnapshot->xmin, SerializableSnapshot->xmax, active);
242    
243          ret = SPI_exec(sql, 0);          ret = SPI_exec(sql, 0);
244    
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