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Add function to generate PostgreSQL tablespace identifier.

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In PostgreSQL >= 9.0 each tablespace data is stored in a specially named directory so different major versions can share the same tablespace path.
This commit is contained in:
David Steele
2019-09-08 06:53:23 -04:00
parent 051128ed9e
commit d957acb36b
3 changed files with 35 additions and 1 deletions
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26
src/postgres/interface.c
View File

@ -513,6 +513,32 @@ pgWalFromFile(const String *walFile)
FUNCTION_LOG_RETURN(PG_WAL, result);
}
/**********************************************************************************************************************************/
String *
pgTablespaceId(unsigned int pgVersion)
{
FUNCTION_TEST_BEGIN();
FUNCTION_TEST_PARAM(UINT, pgVersion);
FUNCTION_TEST_END();
String *result = NULL;
if (pgVersion >= PG_VERSION_90)
{
MEM_CONTEXT_TEMP_BEGIN()
{
String *pgVersionStr = pgVersionToStr(pgVersion);
memContextSwitch(MEM_CONTEXT_OLD());
result = strNewFmt("PG_%s_%u", strPtr(pgVersionStr), pgCatalogVersion(pgVersion));
memContextSwitch(MEM_CONTEXT_TEMP());
}
MEM_CONTEXT_TEMP_END();
}
FUNCTION_TEST_RETURN(result);
}
/***********************************************************************************************************************************
Get WAL name (wal/xlog) for a PostgreSQL version
***********************************************************************************************************************************/

3
src/postgres/interface.h
View File

@ -81,6 +81,9 @@ String *pgVersionToStr(unsigned int version);
PgWal pgWalFromFile(const String *walFile);
PgWal pgWalFromBuffer(const Buffer *walBuffer);
// Get the tablespace identifier used to distinguish versions in a tablespace directory, e.g. XXX
String *pgTablespaceId(unsigned int pgVersion);
const String *pgWalName(unsigned int pgVersion);
/***********************************************************************************************************************************

7
test/src/module/postgres/interfaceTest.c
View File

@ -103,8 +103,13 @@ testRun(void)
}
// *****************************************************************************************************************************
if (testBegin("pgWalName()"))
if (testBegin("pgTablespaceId() and pgWalName()"))
{
TEST_RESULT_STR_Z(pgTablespaceId(PG_VERSION_84), NULL, "check 8.4 tablespace id");
TEST_RESULT_STR_Z(pgTablespaceId(PG_VERSION_90), "PG_9.0_201008051", "check 9.0 tablespace id");
TEST_RESULT_STR_Z(pgTablespaceId(PG_VERSION_94), "PG_9.4_201409291", "check 9.4 tablespace id");
TEST_RESULT_STR_Z(pgTablespaceId(PG_VERSION_11), "PG_11_201809051", "check 11 tablespace id");
TEST_RESULT_STR(strPtr(pgWalName(PG_VERSION_96)), "xlog", "check xlog name");
TEST_RESULT_STR(strPtr(pgWalName(PG_VERSION_10)), "wal", "check wal name");
}