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Add pgLsnFromStr(), pgLsnToStr(), and pgLsnToWalSegment().

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This commit is contained in:
David Steele
2019-12-08 14:19:47 -05:00
parent f517b141fb
commit 2cfde18755
4 changed files with 70 additions and 1 deletions
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47
src/postgres/interface.c
View File

@ -571,6 +571,53 @@ pgTablespaceId(unsigned int pgVersion)
FUNCTION_TEST_RETURN(result);
}
/**********************************************************************************************************************************/
uint64_t
pgLsnFromStr(const String *lsn)
{
FUNCTION_TEST_BEGIN();
FUNCTION_TEST_PARAM(STRING, lsn);
FUNCTION_TEST_END();
uint64_t result = 0;
MEM_CONTEXT_TEMP_BEGIN()
{
StringList *lsnPart = strLstNewSplit(lsn, FSLASH_STR);
CHECK(strLstSize(lsnPart) == 2);
result = (cvtZToUInt64Base(strPtr(strLstGet(lsnPart, 0)), 16) << 32) + cvtZToUInt64Base(strPtr(strLstGet(lsnPart, 1)), 16);
}
MEM_CONTEXT_TEMP_END();
FUNCTION_TEST_RETURN(result);
}
String *
pgLsnToStr(uint64_t lsn)
{
FUNCTION_TEST_BEGIN();
FUNCTION_TEST_PARAM(UINT64, lsn);
FUNCTION_TEST_END();
FUNCTION_TEST_RETURN(strNewFmt("%x/%x", (unsigned int)(lsn >> 32), (unsigned int)(lsn & 0xFFFFFFFF)));
}
/**********************************************************************************************************************************/
String *
pgLsnToWalSegment(uint32_t timeline, uint64_t lsn, unsigned int walSegmentSize)
{
FUNCTION_TEST_BEGIN();
FUNCTION_TEST_PARAM(UINT, timeline);
FUNCTION_TEST_PARAM(UINT64, lsn);
FUNCTION_TEST_PARAM(UINT, walSegmentSize);
FUNCTION_TEST_END();
FUNCTION_TEST_RETURN(
strNewFmt("%08X%08X%08X", timeline, (unsigned int)(lsn >> 32), (unsigned int)(lsn & 0xFFFFFFFF / walSegmentSize)));
}
/**********************************************************************************************************************************/
const String *
pgLsnName(unsigned int pgVersion)

7
src/postgres/interface.h
View File

@ -125,6 +125,13 @@ PgWal pgWalFromBuffer(const Buffer *walBuffer);
// Get the tablespace identifier used to distinguish versions in a tablespace directory, e.g. PG_9.0_201008051
String *pgTablespaceId(unsigned int pgVersion);
// Convert a string to an lsn and vice versa
uint64_t pgLsnFromStr(const String *lsn);
String *pgLsnToStr(uint64_t lsn);
// Convert a timeline and lsn to a wal segment
String *pgLsnToWalSegment(uint32_t timeline, uint64_t lsn, unsigned int walSegmentSize);
// Get name used for lsn in functions (this was changed in PostgreSQL 10 for consistency since lots of names were changing)
const String *pgLsnName(unsigned int pgVersion);

2
test/define.yaml
View File

@ -342,7 +342,7 @@ unit:
# ----------------------------------------------------------------------------------------------------------------------------
- name: interface
total: 7
total: 8
coverage:
postgres/interface: full

15
test/src/module/postgres/interfaceTest.c
View File

@ -101,6 +101,21 @@ testRun(void)
TEST_RESULT_INT(info.version, PG_VERSION_83, " check version");
}
// *****************************************************************************************************************************
if (testBegin("pgLsnFromStr(), pgLsnToStr(), and pgLsnToWalSegment()"))
{
TEST_RESULT_UINT(pgLsnFromStr(STRDEF("1/1")), 0x0000000100000001, "lsn to string");
TEST_RESULT_UINT(pgLsnFromStr(STRDEF("ffffffff/ffffffff")), 0xFFFFFFFFFFFFFFFF, "lsn to string");
TEST_RESULT_UINT(pgLsnFromStr(STRDEF("ffffffff/aaaaaaaa")), 0xFFFFFFFFAAAAAAAA, "lsn to string");
TEST_RESULT_STR_Z(pgLsnToStr(0xFFFFFFFFAAAAAAAA), "ffffffff/aaaaaaaa", "string to lsn");
TEST_RESULT_STR_Z(pgLsnToStr(0x0000000000000000), "0/0", "string to lsn");
TEST_RESULT_STR_Z(pgLsnToStr(0x0000000100000002), "1/2", "string to lsn");
TEST_RESULT_STR_Z(pgLsnToWalSegment(1, 0xFFFFFFFFAAAAAAAA, 0x1000000), "00000001FFFFFFFF000000AA", "lsn to wal segment");
TEST_RESULT_STR_Z(pgLsnToWalSegment(1, 0xFFFFFFFFAAAAAAAA, 0x40000000), "00000001FFFFFFFF00000002", "lsn to wal segment");
}
// *****************************************************************************************************************************
if (testBegin("pgLsnName(), pgTablespaceId(), pgWalName(), and pgXactPath()"))
{