Line data    Source code

       1             : %{
       2             : /*-------------------------------------------------------------------------
       3             :  *
       4             :  * syncrep_gram.y               - Parser for synchronous_standby_names
       5             :  *
       6             :  * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
       7             :  * Portions Copyright (c) 1994, Regents of the University of California
       8             :  *
       9             :  *
      10             :  * IDENTIFICATION
      11             :  *    src/backend/replication/syncrep_gram.y
      12             :  *
      13             :  *-------------------------------------------------------------------------
      14             :  */
      15             : #include "postgres.h"
      16             : 
      17             : #include "nodes/pg_list.h"
      18             : #include "replication/syncrep.h"
      19             : 
      20             : #include "syncrep_gram.h"
      21             : 
      22             : /* Result of parsing is returned in one of these two variables */
      23             : SyncRepConfigData *syncrep_parse_result;
      24             : char       *syncrep_parse_error_msg;
      25             : 
      26             : static SyncRepConfigData *create_syncrep_config(const char *num_sync,
      27             :                     List *members, uint8 syncrep_method);
      28             : 
      29             : /* silence -Wmissing-variable-declarations */
      30             : extern int syncrep_yychar;
      31             : extern int syncrep_yynerrs;
      32             : 
      33             : /*
      34             :  * Bison doesn't allocate anything that needs to live across parser calls,
      35             :  * so we can easily have it use palloc instead of malloc.  This prevents
      36             :  * memory leaks if we error out during parsing.
      37             :  */
      38             : #define YYMALLOC palloc
      39             : #define YYFREE   pfree
      40             : 
      41             : %}
      42             : 
      43             : %expect 0
      44             : %name-prefix="syncrep_yy"
      45             : 
      46             : %union
      47             : {
      48             :     char       *str;
      49             :     List       *list;
      50             :     SyncRepConfigData *config;
      51             : }
      52             : 
      53             : %token <str> NAME NUM JUNK ANY FIRST
      54             : 
      55             : %type <config> result standby_config
      56             : %type <list> standby_list
      57             : %type <str> standby_name
      58             : 
      59             : %start result
      60             : 
      61             : %%
      62             : result:
      63         130 :         standby_config              { syncrep_parse_result = $1; }
      64             :     ;
      65             : 
      66             : standby_config:
      67          94 :         standby_list                { $$ = create_syncrep_config("1", $1, SYNC_REP_PRIORITY); }
      68          24 :         | NUM '(' standby_list ')'      { $$ = create_syncrep_config($1, $3, SYNC_REP_PRIORITY); }
      69           8 :         | ANY NUM '(' standby_list ')'      { $$ = create_syncrep_config($2, $4, SYNC_REP_QUORUM); }
      70           4 :         | FIRST NUM '(' standby_list ')'        { $$ = create_syncrep_config($2, $4, SYNC_REP_PRIORITY); }
      71             :     ;
      72             : 
      73             : standby_list:
      74         130 :         standby_name                        { $$ = list_make1($1); }
      75          60 :         | standby_list ',' standby_name     { $$ = lappend($1, $3); }
      76             :     ;
      77             : 
      78             : standby_name:
      79         190 :         NAME                        { $$ = $1; }
      80           0 :         | NUM                       { $$ = $1; }
      81             :     ;
      82             : %%
      83             : 
      84             : static SyncRepConfigData *
      85         130 : create_syncrep_config(const char *num_sync, List *members, uint8 syncrep_method)
      86             : {
      87             :     SyncRepConfigData *config;
      88             :     int         size;
      89             :     ListCell   *lc;
      90             :     char       *ptr;
      91             : 
      92             :     /* Compute space needed for flat representation */
      93         130 :     size = offsetof(SyncRepConfigData, member_names);
      94         320 :     foreach(lc, members)
      95             :     {
      96         190 :         char       *standby_name = (char *) lfirst(lc);
      97             : 
      98         190 :         size += strlen(standby_name) + 1;
      99             :     }
     100             : 
     101             :     /* And transform the data into flat representation */
     102         130 :     config = (SyncRepConfigData *) palloc(size);
     103             : 
     104         130 :     config->config_size = size;
     105         130 :     config->num_sync = atoi(num_sync);
     106         130 :     config->syncrep_method = syncrep_method;
     107         130 :     config->nmembers = list_length(members);
     108         130 :     ptr = config->member_names;
     109         320 :     foreach(lc, members)
     110             :     {
     111         190 :         char       *standby_name = (char *) lfirst(lc);
     112             : 
     113         190 :         strcpy(ptr, standby_name);
     114         190 :         ptr += strlen(standby_name) + 1;
     115             :     }
     116             : 
     117         130 :     return config;
     118             : }