Line data    Source code

       1             : %{
       2             : /*-------------------------------------------------------------------------
       3             :  *
       4             :  * syncrep_gram.y               - Parser for synchronous_standby_names
       5             :  *
       6             :  * Portions Copyright (c) 1996-2025, 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             : /*
      30             :  * Bison doesn't allocate anything that needs to live across parser calls,
      31             :  * so we can easily have it use palloc instead of malloc.  This prevents
      32             :  * memory leaks if we error out during parsing.
      33             :  */
      34             : #define YYMALLOC palloc
      35             : #define YYFREE   pfree
      36             : 
      37             : %}
      38             : 
      39             : %parse-param {yyscan_t yyscanner}
      40             : %lex-param   {yyscan_t yyscanner}
      41             : %pure-parser
      42             : %expect 0
      43             : %name-prefix="syncrep_yy"
      44             : 
      45             : %union
      46             : {
      47             :     char       *str;
      48             :     List       *list;
      49             :     SyncRepConfigData *config;
      50             : }
      51             : 
      52             : %token <str> NAME NUM JUNK ANY FIRST
      53             : 
      54             : %type <config> result standby_config
      55             : %type <list> standby_list
      56             : %type <str> standby_name
      57             : 
      58             : %start result
      59             : 
      60             : %%
      61             : result:
      62             :         standby_config              {
      63         130 :                                         syncrep_parse_result = $1;
      64             :                                         (void) yynerrs; /* suppress compiler warning */
      65             :                                     }
      66             :     ;
      67             : 
      68             : standby_config:
      69          94 :         standby_list                { $$ = create_syncrep_config("1", $1, SYNC_REP_PRIORITY); }
      70          24 :         | NUM '(' standby_list ')'      { $$ = create_syncrep_config($1, $3, SYNC_REP_PRIORITY); }
      71           8 :         | ANY NUM '(' standby_list ')'      { $$ = create_syncrep_config($2, $4, SYNC_REP_QUORUM); }
      72           4 :         | FIRST NUM '(' standby_list ')'        { $$ = create_syncrep_config($2, $4, SYNC_REP_PRIORITY); }
      73             :     ;
      74             : 
      75             : standby_list:
      76         130 :         standby_name                        { $$ = list_make1($1); }
      77          60 :         | standby_list ',' standby_name     { $$ = lappend($1, $3); }
      78             :     ;
      79             : 
      80             : standby_name:
      81         190 :         NAME                        { $$ = $1; }
      82           0 :         | NUM                       { $$ = $1; }
      83             :     ;
      84             : %%
      85             : 
      86             : static SyncRepConfigData *
      87         130 : create_syncrep_config(const char *num_sync, List *members, uint8 syncrep_method)
      88             : {
      89             :     SyncRepConfigData *config;
      90             :     int         size;
      91             :     ListCell   *lc;
      92             :     char       *ptr;
      93             : 
      94             :     /* Compute space needed for flat representation */
      95         130 :     size = offsetof(SyncRepConfigData, member_names);
      96         320 :     foreach(lc, members)
      97             :     {
      98         190 :         char       *standby_name = (char *) lfirst(lc);
      99             : 
     100         190 :         size += strlen(standby_name) + 1;
     101             :     }
     102             : 
     103             :     /* And transform the data into flat representation */
     104         130 :     config = (SyncRepConfigData *) palloc(size);
     105             : 
     106         130 :     config->config_size = size;
     107         130 :     config->num_sync = atoi(num_sync);
     108         130 :     config->syncrep_method = syncrep_method;
     109         130 :     config->nmembers = list_length(members);
     110         130 :     ptr = config->member_names;
     111         320 :     foreach(lc, members)
     112             :     {
     113         190 :         char       *standby_name = (char *) lfirst(lc);
     114             : 
     115         190 :         strcpy(ptr, standby_name);
     116         190 :         ptr += strlen(standby_name) + 1;
     117             :     }
     118             : 
     119         130 :     return config;
     120             : }