LCOV - code coverage report
Current view: top level - src/backend/commands - conversioncmds.c (source / functions) Hit Total Coverage
Test: PostgreSQL 13beta1 Lines: 19 27 70.4 %
Date: 2020-06-01 09:07:10 Functions: 1 1 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*-------------------------------------------------------------------------
       2             :  *
       3             :  * conversioncmds.c
       4             :  *    conversion creation command support code
       5             :  *
       6             :  * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
       7             :  * Portions Copyright (c) 1994, Regents of the University of California
       8             :  *
       9             :  *
      10             :  * IDENTIFICATION
      11             :  *    src/backend/commands/conversioncmds.c
      12             :  *
      13             :  *-------------------------------------------------------------------------
      14             :  */
      15             : #include "postgres.h"
      16             : 
      17             : #include "access/htup_details.h"
      18             : #include "catalog/dependency.h"
      19             : #include "catalog/indexing.h"
      20             : #include "catalog/pg_conversion.h"
      21             : #include "catalog/pg_type.h"
      22             : #include "commands/alter.h"
      23             : #include "commands/conversioncmds.h"
      24             : #include "mb/pg_wchar.h"
      25             : #include "miscadmin.h"
      26             : #include "parser/parse_func.h"
      27             : #include "utils/acl.h"
      28             : #include "utils/builtins.h"
      29             : #include "utils/lsyscache.h"
      30             : #include "utils/rel.h"
      31             : #include "utils/syscache.h"
      32             : 
      33             : /*
      34             :  * CREATE CONVERSION
      35             :  */
      36             : ObjectAddress
      37          44 : CreateConversionCommand(CreateConversionStmt *stmt)
      38             : {
      39             :     Oid         namespaceId;
      40             :     char       *conversion_name;
      41             :     AclResult   aclresult;
      42             :     int         from_encoding;
      43             :     int         to_encoding;
      44             :     Oid         funcoid;
      45          44 :     const char *from_encoding_name = stmt->for_encoding_name;
      46          44 :     const char *to_encoding_name = stmt->to_encoding_name;
      47          44 :     List       *func_name = stmt->func_name;
      48             :     static const Oid funcargs[] = {INT4OID, INT4OID, CSTRINGOID, INTERNALOID, INT4OID};
      49             :     char        result[1];
      50             : 
      51             :     /* Convert list of names to a name and namespace */
      52          44 :     namespaceId = QualifiedNameGetCreationNamespace(stmt->conversion_name,
      53             :                                                     &conversion_name);
      54             : 
      55             :     /* Check we have creation rights in target namespace */
      56          44 :     aclresult = pg_namespace_aclcheck(namespaceId, GetUserId(), ACL_CREATE);
      57          44 :     if (aclresult != ACLCHECK_OK)
      58           0 :         aclcheck_error(aclresult, OBJECT_SCHEMA,
      59           0 :                        get_namespace_name(namespaceId));
      60             : 
      61             :     /* Check the encoding names */
      62          44 :     from_encoding = pg_char_to_encoding(from_encoding_name);
      63          44 :     if (from_encoding < 0)
      64           0 :         ereport(ERROR,
      65             :                 (errcode(ERRCODE_UNDEFINED_OBJECT),
      66             :                  errmsg("source encoding \"%s\" does not exist",
      67             :                         from_encoding_name)));
      68             : 
      69          44 :     to_encoding = pg_char_to_encoding(to_encoding_name);
      70          44 :     if (to_encoding < 0)
      71           0 :         ereport(ERROR,
      72             :                 (errcode(ERRCODE_UNDEFINED_OBJECT),
      73             :                  errmsg("destination encoding \"%s\" does not exist",
      74             :                         to_encoding_name)));
      75             : 
      76             :     /*
      77             :      * We consider conversions to or from SQL_ASCII to be meaningless.  (If
      78             :      * you wish to change this, note that pg_do_encoding_conversion() and its
      79             :      * sister functions have hard-wired fast paths for any conversion in which
      80             :      * the source or target encoding is SQL_ASCII, so that an encoding
      81             :      * conversion function declared for such a case will never be used.)
      82             :      */
      83          44 :     if (from_encoding == PG_SQL_ASCII || to_encoding == PG_SQL_ASCII)
      84           0 :         ereport(ERROR,
      85             :                 (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
      86             :                  errmsg("encoding conversion to or from \"SQL_ASCII\" is not supported")));
      87             : 
      88             :     /*
      89             :      * Check the existence of the conversion function. Function name could be
      90             :      * a qualified name.
      91             :      */
      92          44 :     funcoid = LookupFuncName(func_name, sizeof(funcargs) / sizeof(Oid),
      93             :                              funcargs, false);
      94             : 
      95             :     /* Check it returns VOID, else it's probably the wrong function */
      96          44 :     if (get_func_rettype(funcoid) != VOIDOID)
      97           0 :         ereport(ERROR,
      98             :                 (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
      99             :                  errmsg("encoding conversion function %s must return type %s",
     100             :                         NameListToString(func_name), "void")));
     101             : 
     102             :     /* Check we have EXECUTE rights for the function */
     103          44 :     aclresult = pg_proc_aclcheck(funcoid, GetUserId(), ACL_EXECUTE);
     104          44 :     if (aclresult != ACLCHECK_OK)
     105           0 :         aclcheck_error(aclresult, OBJECT_FUNCTION,
     106           0 :                        NameListToString(func_name));
     107             : 
     108             :     /*
     109             :      * Check that the conversion function is suitable for the requested source
     110             :      * and target encodings. We do that by calling the function with an empty
     111             :      * string; the conversion function should throw an error if it can't
     112             :      * perform the requested conversion.
     113             :      */
     114          44 :     OidFunctionCall5(funcoid,
     115             :                      Int32GetDatum(from_encoding),
     116             :                      Int32GetDatum(to_encoding),
     117             :                      CStringGetDatum(""),
     118             :                      CStringGetDatum(result),
     119             :                      Int32GetDatum(0));
     120             : 
     121             :     /*
     122             :      * All seem ok, go ahead (possible failure would be a duplicate conversion
     123             :      * name)
     124             :      */
     125          44 :     return ConversionCreate(conversion_name, namespaceId, GetUserId(),
     126          44 :                             from_encoding, to_encoding, funcoid, stmt->def);
     127             : }

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