Line data    Source code

       1             : %{
       2             : /*-------------------------------------------------------------------------
       3             :  *
       4             :  * syncrep_gram.y               - Parser for synchronous_standby_names
       5             :  *
       6             :  * Portions Copyright (c) 1996-2017, 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 "replication/syncrep.h"
      18             : 
      19             : /* Result of parsing is returned in one of these two variables */
      20             : SyncRepConfigData *syncrep_parse_result;
      21             : char       *syncrep_parse_error_msg;
      22             : 
      23             : static SyncRepConfigData *create_syncrep_config(const char *num_sync,
      24             :                     List *members, uint8 syncrep_method);
      25             : 
      26             : /*
      27             :  * Bison doesn't allocate anything that needs to live across parser calls,
      28             :  * so we can easily have it use palloc instead of malloc.  This prevents
      29             :  * memory leaks if we error out during parsing.  Note this only works with
      30             :  * bison >= 2.0.  However, in bison 1.875 the default is to use alloca()
      31             :  * if possible, so there's not really much problem anyhow, at least if
      32             :  * you're building with gcc.
      33             :  */
      34             : #define YYMALLOC palloc
      35             : #define YYFREE   pfree
      36             : 
      37             : %}
      38             : 
      39             : %expect 0
      40             : %name-prefix="syncrep_yy"
      41             : 
      42             : %union
      43             : {
      44             :     char       *str;
      45             :     List       *list;
      46             :     SyncRepConfigData *config;
      47             : }
      48             : 
      49             : %token <str> NAME NUM JUNK ANY FIRST
      50             : 
      51             : %type <config> result standby_config
      52             : %type <list> standby_list
      53             : %type <str> standby_name
      54             : 
      55             : %start result
      56             : 
      57             : %%
      58             : result:
      59           0 :         standby_config              { syncrep_parse_result = $1; }
      60             :     ;
      61             : 
      62             : standby_config:
      63           0 :         standby_list                { $$ = create_syncrep_config("1", $1, SYNC_REP_PRIORITY); }
      64           0 :         | NUM '(' standby_list ')'      { $$ = create_syncrep_config($1, $3, SYNC_REP_PRIORITY); }
      65           0 :         | ANY NUM '(' standby_list ')'      { $$ = create_syncrep_config($2, $4, SYNC_REP_QUORUM); }
      66           0 :         | FIRST NUM '(' standby_list ')'        { $$ = create_syncrep_config($2, $4, SYNC_REP_PRIORITY); }
      67             :     ;
      68             : 
      69             : standby_list:
      70           0 :         standby_name                        { $$ = list_make1($1); }
      71           0 :         | standby_list ',' standby_name     { $$ = lappend($1, $3); }
      72             :     ;
      73             : 
      74             : standby_name:
      75           0 :         NAME                        { $$ = $1; }
      76           0 :         | NUM                       { $$ = $1; }
      77             :     ;
      78             : %%
      79             : 
      80             : static SyncRepConfigData *
      81           0 : create_syncrep_config(const char *num_sync, List *members, uint8 syncrep_method)
      82             : {
      83             :     SyncRepConfigData *config;
      84             :     int         size;
      85             :     ListCell   *lc;
      86             :     char       *ptr;
      87             : 
      88             :     /* Compute space needed for flat representation */
      89           0 :     size = offsetof(SyncRepConfigData, member_names);
      90           0 :     foreach(lc, members)
      91             :     {
      92           0 :         char       *standby_name = (char *) lfirst(lc);
      93             : 
      94           0 :         size += strlen(standby_name) + 1;
      95             :     }
      96             : 
      97             :     /* And transform the data into flat representation */
      98           0 :     config = (SyncRepConfigData *) palloc(size);
      99             : 
     100           0 :     config->config_size = size;
     101           0 :     config->num_sync = atoi(num_sync);
     102           0 :     config->syncrep_method = syncrep_method;
     103           0 :     config->nmembers = list_length(members);
     104           0 :     ptr = config->member_names;
     105           0 :     foreach(lc, members)
     106             :     {
     107           0 :         char       *standby_name = (char *) lfirst(lc);
     108             : 
     109           0 :         strcpy(ptr, standby_name);
     110           0 :         ptr += strlen(standby_name) + 1;
     111             :     }
     112             : 
     113           0 :     return config;
     114             : }
     115             : 
     116             : #include "syncrep_scanner.c"