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