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f42d927d2d
On certain file systems (e.g. ext4) pg_control may appear torn if there is a concurrent write while reading the file. To prevent an invalid read, retry until the checksum matches the control data. Special handling is required for the pg-version-force feature since the offset of the checksum is not known. In this case, scan from the default position to the end of the data looking for a checksum match. This is a bit imprecise, but better than nothing, and the chance of a random collision in the control data seems very remote considering the ratio of data size (< 512 bytes) to checksum size (4 bytes). This was discovered and a possible solution proposed for PostgreSQL in [1]. The proposed solution may work for backup, but pgBackRest needs to be able to read pg_control reliably outside of backup. So no matter what fix is adopted for PostgreSQL, pgBackRest need retries. Further adjustment may be required as the PostgreSQL fix evolves. [1] https://www.postgresql.org/message-id/20221123014224.xisi44byq3cf5psi%40awork3.anarazel.de
351 lines
20 KiB
C
351 lines
20 KiB
C
/***********************************************************************************************************************************
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Test PostgreSQL Interface
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***********************************************************************************************************************************/
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#include "storage/posix/storage.h"
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#include "common/harnessPostgres.h"
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/***********************************************************************************************************************************
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Test Run
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***********************************************************************************************************************************/
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static void
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testRun(void)
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{
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FUNCTION_HARNESS_VOID();
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Storage *storageTest = storagePosixNewP(TEST_PATH_STR, .write = true);
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// *****************************************************************************************************************************
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if (testBegin("pgVersionFromStr() and pgVersionToStr()"))
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{
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TEST_ERROR(pgVersionFromStr(STRDEF("9.3.4")), AssertError, "version 9.3.4 format is invalid");
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TEST_ERROR(pgVersionFromStr(STRDEF("abc")), AssertError, "version abc format is invalid");
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TEST_ERROR(pgVersionFromStr(NULL), AssertError, "assertion 'version != NULL' failed");
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TEST_RESULT_INT(pgVersionFromStr(STRDEF("10")), PG_VERSION_10, "valid pg version 10");
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TEST_RESULT_INT(pgVersionFromStr(STRDEF("9.6")), 90600, "valid pg version 9.6");
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// -------------------------------------------------------------------------------------------------------------------------
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TEST_RESULT_STR_Z(pgVersionToStr(PG_VERSION_11), "11", "infoPgVersionToString 11");
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TEST_RESULT_STR_Z(pgVersionToStr(PG_VERSION_96), "9.6", "infoPgVersionToString 9.6");
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TEST_RESULT_STR_Z(pgVersionToStr(93456), "9.34", "infoPgVersionToString 93456");
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}
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// *****************************************************************************************************************************
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if (testBegin("pgDbIs*()"))
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{
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TEST_RESULT_BOOL(pgDbIsTemplate(STRDEF("template0")), true, "template0 is template");
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TEST_RESULT_BOOL(pgDbIsTemplate(STRDEF("template1")), true, "template1 is template");
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TEST_RESULT_BOOL(pgDbIsTemplate(STRDEF("postgres")), false, "postgres is not template");
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TEST_RESULT_BOOL(pgDbIsSystem(STRDEF("postgres")), true, "postgres is system");
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TEST_RESULT_BOOL(pgDbIsSystem(STRDEF("template0")), true, "template0 is system");
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TEST_RESULT_BOOL(pgDbIsSystem(STRDEF("app")), false, "app is not system");
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TEST_RESULT_BOOL(pgDbIsSystemId(16383), true, "16383 is system");
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TEST_RESULT_BOOL(pgDbIsSystemId(16384), false, "16384 is not system");
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}
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// *****************************************************************************************************************************
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if (testBegin("pgControlVersion()"))
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{
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TEST_ERROR(
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pgControlVersion(70300), VersionNotSupportedError,
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"invalid PostgreSQL version 70300\n"
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"HINT: is this version of PostgreSQL supported?");
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TEST_RESULT_UINT(pgControlVersion(PG_VERSION_93), 937, "9.3 control version");
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TEST_RESULT_UINT(pgControlVersion(PG_VERSION_11), 1100, "11 control version");
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}
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// *****************************************************************************************************************************
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if (testBegin("pgControlFromBuffer() and pgControlFromFile()"))
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{
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// Sanity test to ensure PG_VERSION_MAX has been updated
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// -------------------------------------------------------------------------------------------------------------------------
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TEST_RESULT_UINT(pgInterface[0].version, PG_VERSION_MAX, "check max version");
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// -------------------------------------------------------------------------------------------------------------------------
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TEST_TITLE("unknown control version");
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HRN_PG_CONTROL_OVERRIDE_VERSION_PUT(storageTest, PG_VERSION_15, 1501, .catalogVersion = 202211111);
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TEST_ERROR(
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pgControlFromFile(storageTest, NULL), VersionNotSupportedError,
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"unexpected control version = 1501 and catalog version = 202211111\n"
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"HINT: is this version of PostgreSQL supported?");
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// -------------------------------------------------------------------------------------------------------------------------
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TEST_TITLE("invalid CRC");
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HRN_PG_CONTROL_OVERRIDE_CRC_PUT(storageTest, PG_VERSION_11, 0xFADEFADE);
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TEST_ERROR_FMT(
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pgControlFromFile(storageTest, NULL), ChecksumError,
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"calculated pg_control checksum does not match expected value\n"
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"HINT: calculated 0x%x but expected value is 0xfadefade\n"
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"HINT: is pg_control corrupt?\n"
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"HINT: does pg_control have a different layout than expected?",
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(uint32_t)(TEST_BIG_ENDIAN() ? 0x4e206eeb : (TEST_64BIT() ? 0x4ad387b2 : 0x3ca3a1ec)));
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// -------------------------------------------------------------------------------------------------------------------------
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TEST_TITLE("invalid CRC on force control version");
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HRN_PG_CONTROL_OVERRIDE_CRC_PUT(storageTest, PG_VERSION_13, 0xFADEFADE);
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TEST_ERROR_FMT(
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pgControlFromFile(storageTest, STRDEF(PG_VERSION_14_Z)), ChecksumError,
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"calculated pg_control checksum does not match expected value\n"
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"HINT: calculated 0x%x but expected value is 0x0\n"
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"HINT: checksum values may be misleading due to forced version scan\n"
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"HINT: is pg_control corrupt?\n"
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"HINT: does pg_control have a different layout than expected?",
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(uint32_t)(TEST_BIG_ENDIAN() ? 0x27dc2b85 : (TEST_64BIT() ? 0xa9264d94 : 0xb371302a)));
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// -------------------------------------------------------------------------------------------------------------------------
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HRN_PG_CONTROL_PUT(
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storageTest, PG_VERSION_11, .systemId = 0xFACEFACE, .checkpoint = 0xEEFFEEFFAABBAABB, .timeline = 47,
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.walSegmentSize = 1024 * 1024);
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PgControl info = {0};
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TEST_ASSIGN(info, pgControlFromFile(storageTest, NULL), "get control info v11");
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TEST_RESULT_UINT(info.systemId, 0xFACEFACE, " check system id");
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TEST_RESULT_UINT(info.version, PG_VERSION_11, " check version");
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TEST_RESULT_UINT(info.catalogVersion, 201809051, " check catalog version");
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TEST_RESULT_UINT(info.checkpoint, 0xEEFFEEFFAABBAABB, "check checkpoint");
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TEST_RESULT_UINT(info.timeline, 47, "check timeline");
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// -------------------------------------------------------------------------------------------------------------------------
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HRN_PG_CONTROL_PUT(storageTest, PG_VERSION_93, .walSegmentSize = 1024 * 1024);
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TEST_ERROR(
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pgControlFromFile(storageTest, NULL), FormatError,
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"wal segment size is 1048576 but must be 16777216 for PostgreSQL <= 10");
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// -------------------------------------------------------------------------------------------------------------------------
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HRN_PG_CONTROL_PUT(storageTest, PG_VERSION_95, .pageSize = 32 * 1024);
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TEST_ERROR(pgControlFromFile(storageTest, NULL), FormatError, "page size is 32768 but must be 8192");
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// -------------------------------------------------------------------------------------------------------------------------
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HRN_PG_CONTROL_PUT(
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storageTest, PG_VERSION_93, .systemId = 0xEFEFEFEFEF, .catalogVersion = hrnPgCatalogVersion(PG_VERSION_93),
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.checkpoint = 0xAABBAABBEEFFEEFF, .timeline = 88);
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TEST_ASSIGN(info, pgControlFromFile(storageTest, NULL), "get control info v90");
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TEST_RESULT_UINT(info.systemId, 0xEFEFEFEFEF, " check system id");
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TEST_RESULT_UINT(info.version, PG_VERSION_93, " check version");
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TEST_RESULT_UINT(info.catalogVersion, 201306121, " check catalog version");
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TEST_RESULT_UINT(info.checkpoint, 0xAABBAABBEEFFEEFF, "check checkpoint");
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TEST_RESULT_UINT(info.timeline, 88, "check timeline");
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// -------------------------------------------------------------------------------------------------------------------------
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TEST_TITLE("force control version");
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HRN_PG_CONTROL_OVERRIDE_VERSION_PUT(
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storageTest, PG_VERSION_15, 1501, .systemId = 0xEFEFEFEFEF, .catalogVersion = 202211111,
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.checkpoint = 0xAABBAABBEEFFEEFF, .timeline = 88);
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TEST_ERROR(
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pgControlFromFile(storageTest, NULL), VersionNotSupportedError,
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"unexpected control version = 1501 and catalog version = 202211111\n"
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"HINT: is this version of PostgreSQL supported?");
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TEST_ERROR(
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pgControlFromFile(storageTest, STRDEF("99")), VersionNotSupportedError,
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"invalid PostgreSQL version 990000\n"
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"HINT: is this version of PostgreSQL supported?");
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TEST_ASSIGN(info, pgControlFromFile(storageTest, STRDEF(PG_VERSION_15_Z)), "get control info v90");
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TEST_RESULT_UINT(info.systemId, 0xEFEFEFEFEF, "check system id");
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TEST_RESULT_UINT(info.version, PG_VERSION_15, "check version");
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TEST_RESULT_UINT(info.catalogVersion, 202211111, "check catalog version");
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TEST_RESULT_UINT(info.checkpoint, 0xAABBAABBEEFFEEFF, "check checkpoint");
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TEST_RESULT_UINT(info.timeline, 88, "check timeline");
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// -------------------------------------------------------------------------------------------------------------------------
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TEST_TITLE("CRC at greater offset on force control version");
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// Start with an invalid crc but write a valid one at a greater offset to test the forced scan
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Buffer *control = hrnPgControlToBuffer(0, 0xFADEFADE, (PgControl){.version = PG_VERSION_13, .systemId = 0xAAAA0AAAA});
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size_t crcOffset = pgInterfaceVersion(PG_VERSION_13)->controlCrcOffset() + sizeof(uint32_t) * 4;
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*((uint32_t *)(bufPtr(control) + crcOffset)) = crc32cOne(bufPtrConst(control), crcOffset);
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HRN_STORAGE_PUT(storageTest, PG_PATH_GLOBAL "/" PG_FILE_PGCONTROL, control);
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TEST_ASSIGN(info, pgControlFromFile(storageTest, STRDEF(PG_VERSION_14_Z)), "get control info force v14");
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TEST_RESULT_UINT(info.systemId, 0xAAAA0AAAA, "check system id");
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TEST_RESULT_UINT(info.version, PG_VERSION_14, "check version");
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TEST_RESULT_UINT(info.catalogVersion, 202007201, "check catalog version");
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}
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// *****************************************************************************************************************************
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if (testBegin("pgLsnFromStr(), pgLsnToStr(), pgLsnToWalSegment(), pg*FromWalSegment(), and pgLsnRangeToWalSegmentList()"))
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{
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TEST_RESULT_UINT(pgLsnFromStr(STRDEF("1/1")), 0x0000000100000001, "lsn to string");
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TEST_RESULT_UINT(pgLsnFromStr(STRDEF("ffffffff/ffffffff")), 0xFFFFFFFFFFFFFFFF, "lsn to string");
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TEST_RESULT_UINT(pgLsnFromStr(STRDEF("ffffffff/aaaaaaaa")), 0xFFFFFFFFAAAAAAAA, "lsn to string");
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TEST_RESULT_STR_Z(pgLsnToStr(0xFFFFFFFFAAAAAAAA), "ffffffff/aaaaaaaa", "string to lsn");
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TEST_RESULT_STR_Z(pgLsnToStr(0x0000000000000000), "0/0", "string to lsn");
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TEST_RESULT_STR_Z(pgLsnToStr(0x0000000100000002), "1/2", "string to lsn");
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TEST_RESULT_STR_Z(pgLsnToWalSegment(1, 0xFFFFFFFFAAAAAAAA, 0x1000000), "00000001FFFFFFFF000000AA", "lsn to wal segment");
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TEST_RESULT_STR_Z(pgLsnToWalSegment(1, 0xFFFFFFFFAAAAAAAA, 0x40000000), "00000001FFFFFFFF00000002", "lsn to wal segment");
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TEST_RESULT_STR_Z(pgLsnToWalSegment(1, 0xFFFFFFFF40000000, 0x40000000), "00000001FFFFFFFF00000001", "lsn to wal segment");
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TEST_RESULT_UINT(pgTimelineFromWalSegment(STRDEF("00000001FFFFFFFF000000AA")), 1, "timeline 1");
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TEST_RESULT_UINT(pgTimelineFromWalSegment(STRDEF("F000000FFFFFFFFF000000AA")), 0xF000000F, "timeline F000000F");
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TEST_RESULT_STRLST_Z(
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pgLsnRangeToWalSegmentList(
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2, pgLsnFromStr(STRDEF("1/FD000000")), pgLsnFromStr(STRDEF("2/60")), 16 * 1024 * 1024),
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"0000000200000001000000FD\n0000000200000001000000FE\n0000000200000001000000FF\n000000020000000200000000\n",
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"get range");
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TEST_RESULT_STRLST_Z(
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pgLsnRangeToWalSegmentList(
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2, pgLsnFromStr(STRDEF("A/800")), pgLsnFromStr(STRDEF("B/C0000000")), 1024 * 1024 * 1024),
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"000000020000000A00000000\n000000020000000A00000001\n000000020000000A00000002\n000000020000000A00000003\n"
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"000000020000000B00000000\n000000020000000B00000001\n000000020000000B00000002\n000000020000000B00000003\n",
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"get range >= 11/1GB");
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TEST_RESULT_STRLST_Z(
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pgLsnRangeToWalSegmentList(
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3, pgLsnFromStr(STRDEF("7/FFEFFFFF")), pgLsnFromStr(STRDEF("8/001AAAAA")), 1024 * 1024),
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"000000030000000700000FFE\n000000030000000700000FFF\n000000030000000800000000\n000000030000000800000001\n",
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"get range >= 11/1MB");
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}
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// *****************************************************************************************************************************
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if (testBegin("pgLsnName(), pgTablespaceId(), pgWalName(), pgWalPath(), and pgXactPath()"))
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{
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TEST_RESULT_STR_Z(pgLsnName(PG_VERSION_96), "location", "check location name");
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TEST_RESULT_STR_Z(pgLsnName(PG_VERSION_10), "lsn", "check lsn name");
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TEST_RESULT_STR_Z(pgTablespaceId(PG_VERSION_93, 201306121), "PG_9.3_201306121", "check 9.3 tablespace id");
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TEST_RESULT_STR_Z(pgTablespaceId(PG_VERSION_94, 999999999), "PG_9.4_999999999", "check 9.4 tablespace id");
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TEST_RESULT_STR_Z(pgWalName(PG_VERSION_96), "xlog", "check xlog name");
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TEST_RESULT_STR_Z(pgWalName(PG_VERSION_10), "wal", "check wal name");
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TEST_RESULT_STR_Z(pgWalPath(PG_VERSION_96), "pg_xlog", "check xlog path");
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TEST_RESULT_STR_Z(pgWalPath(PG_VERSION_10), "pg_wal", "check wal path");
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TEST_RESULT_STR_Z(pgXactPath(PG_VERSION_96), "pg_clog", "check pg_clog name");
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TEST_RESULT_STR_Z(pgXactPath(PG_VERSION_10), "pg_xact", "check pg_xact name");
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}
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// *****************************************************************************************************************************
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if (testBegin("pgPageChecksum()"))
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{
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unsigned char page[PG_PAGE_SIZE_DEFAULT];
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memset(page, 0xFF, PG_PAGE_SIZE_DEFAULT);
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TEST_RESULT_UINT(pgPageChecksum(page, 0), TEST_BIG_ENDIAN() ? 0xF55E : 0x0E1C, "check 0xFF filled page, block 0");
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TEST_RESULT_UINT(pgPageChecksum(page, 999), TEST_BIG_ENDIAN() ? 0xF1B9 : 0x0EC3, "check 0xFF filled page, block 999");
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}
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// *****************************************************************************************************************************
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if (testBegin("pgWalFromBuffer() and pgWalFromFile()"))
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{
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const String *walFile = STRDEF(TEST_PATH "/0000000F0000000F0000000F");
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// -------------------------------------------------------------------------------------------------------------------------
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TEST_TITLE("unknown WAL magic");
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Buffer *result = bufNew((size_t)16 * 1024 * 1024);
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memset(bufPtr(result), 0, bufSize(result));
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bufUsedSet(result, bufSize(result));
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HRN_PG_WAL_OVERRIDE_TO_BUFFER(result, PG_VERSION_15, 777);
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TEST_ERROR(
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pgWalFromBuffer(result, NULL), VersionNotSupportedError,
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"unexpected WAL magic 777\n"
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"HINT: is this version of PostgreSQL supported?");
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// -------------------------------------------------------------------------------------------------------------------------
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TEST_TITLE("invalid wal flag");
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((PgWalCommon *)bufPtr(result))->flag = 0;
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TEST_ERROR(pgWalFromBuffer(result, NULL), FormatError, "first page header in WAL file is expected to be in long format");
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// -------------------------------------------------------------------------------------------------------------------------
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memset(bufPtr(result), 0, bufSize(result));
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HRN_PG_WAL_TO_BUFFER(result, PG_VERSION_11, .systemId = 0xECAFECAF, .size = PG_WAL_SEGMENT_SIZE_DEFAULT * 2);
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storagePutP(storageNewWriteP(storageTest, walFile), result);
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PgWal info = {0};
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TEST_ASSIGN(info, pgWalFromFile(walFile, storageTest, NULL), "get wal info v11");
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TEST_RESULT_UINT(info.systemId, 0xECAFECAF, " check system id");
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TEST_RESULT_UINT(info.version, PG_VERSION_11, " check version");
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TEST_RESULT_UINT(info.size, PG_WAL_SEGMENT_SIZE_DEFAULT * 2, " check size");
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// -------------------------------------------------------------------------------------------------------------------------
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memset(bufPtr(result), 0, bufSize(result));
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HRN_PG_WAL_TO_BUFFER(result, PG_VERSION_96, .systemId = 0xEAEAEAEA, .size = PG_WAL_SEGMENT_SIZE_DEFAULT * 2);
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TEST_ERROR(
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pgWalFromBuffer(result, NULL), FormatError, "wal segment size is 33554432 but must be 16777216 for PostgreSQL <= 10");
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// -------------------------------------------------------------------------------------------------------------------------
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memset(bufPtr(result), 0, bufSize(result));
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HRN_PG_WAL_TO_BUFFER(result, PG_VERSION_93, .systemId = 0xEAEAEAEA, .size = PG_WAL_SEGMENT_SIZE_DEFAULT);
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storagePutP(storageNewWriteP(storageTest, walFile), result);
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TEST_ASSIGN(info, pgWalFromFile(walFile, storageTest, NULL), "get wal info v9.3");
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TEST_RESULT_UINT(info.systemId, 0xEAEAEAEA, " check system id");
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TEST_RESULT_UINT(info.version, PG_VERSION_93, " check version");
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TEST_RESULT_UINT(info.size, PG_WAL_SEGMENT_SIZE_DEFAULT, " check size");
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// -------------------------------------------------------------------------------------------------------------------------
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TEST_TITLE("force WAL version");
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memset(bufPtr(result), 0, bufSize(result));
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HRN_PG_WAL_OVERRIDE_TO_BUFFER(result, PG_VERSION_15, 777, .systemId = 0xFAFAFAFA, .size = PG_WAL_SEGMENT_SIZE_DEFAULT);
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storagePutP(storageNewWriteP(storageTest, walFile), result);
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TEST_ERROR(
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pgWalFromBuffer(result, NULL), VersionNotSupportedError,
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"unexpected WAL magic 777\n"
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"HINT: is this version of PostgreSQL supported?");
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TEST_ASSIGN(info, pgWalFromFile(walFile, storageTest, STRDEF(PG_VERSION_15_Z)), "force wal info v15");
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TEST_RESULT_UINT(info.systemId, 0xFAFAFAFA, "check system id");
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TEST_RESULT_UINT(info.version, PG_VERSION_15, " check version");
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TEST_RESULT_UINT(info.size, PG_WAL_SEGMENT_SIZE_DEFAULT, " check size");
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}
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// *****************************************************************************************************************************
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if (testBegin("pgControlToLog()"))
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{
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char logBuf[STACK_TRACE_PARAM_MAX];
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PgControl pgControl =
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{
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.version = PG_VERSION_11,
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.systemId = 0xEFEFEFEFEF,
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.walSegmentSize = 16 * 1024 * 1024,
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.pageChecksum = true
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};
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TEST_RESULT_VOID(FUNCTION_LOG_OBJECT_FORMAT(&pgControl, pgControlToLog, logBuf, sizeof(logBuf)), "pgControlToLog");
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TEST_RESULT_Z(
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logBuf, "{version: 110000, systemId: 1030522662895, walSegmentSize: 16777216, pageChecksum: true}", "check log");
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}
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// *****************************************************************************************************************************
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if (testBegin("pgWalToLog()"))
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{
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char logBuf[STACK_TRACE_PARAM_MAX];
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PgWal pgWal =
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{
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.version = PG_VERSION_10,
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.systemId = 0xFEFEFEFEFE
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};
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TEST_RESULT_VOID(FUNCTION_LOG_OBJECT_FORMAT(&pgWal, pgWalToLog, logBuf, sizeof(logBuf)), "pgWalToLog");
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TEST_RESULT_Z(logBuf, "{version: 100000, systemId: 1095199817470}", "check log");
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}
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FUNCTION_HARNESS_RETURN_VOID();
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}
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