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Support configurable WAL segment size.

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PostgreSQL 11 introduces configurable WAL segment sizes, from 1MB to 1GB.

There are two areas that needed to be updated to support this: building the archive-get queue and checking that WAL has been archived after a backup.  Both operations require the WAL segment size to properly build a list.

Checking the archive after a backup is still implemented in Perl and has an active database connection, so just get the WAL segment size from the database.

The archive-get command does not have a connection to the database, so get the WAL segment size from pg_control instead.  This requires a deeper inspection of pg_control than has been done in the past, so it seemed best to copy the relevant data structures from each version of PostgreSQL and build a generic interface layer to address them.  While this approach is a bit verbose, it has the advantage of being relatively simple, and can easily be updated for new versions of PostgreSQL.

Since the integration tests generate pg_control files for testing, teach Perl how to generate files with the correct offsets for both 32-bit and 64-bit architectures.
This commit is contained in:
David Steele
2018-09-25 10:24:42 +01:00
parent c0b0b4e541
commit d038b9a029
68 changed files with 4949 additions and 486 deletions
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61
src/postgres/interface.h Normal file
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/***********************************************************************************************************************************
PostgreSQL Interface
***********************************************************************************************************************************/
#ifndef POSTGRES_INTERFACE_H
#define POSTGRES_INTERFACE_H
#include <stdint.h>
#include <sys/types.h>
#include "common/type/string.h"
/***********************************************************************************************************************************
Defines for various Postgres paths and files
***********************************************************************************************************************************/
#define PG_FILE_PGCONTROL "pg_control"
#define PG_PATH_GLOBAL "global"
/***********************************************************************************************************************************
PostgreSQL Control File Info
***********************************************************************************************************************************/
typedef struct PgControl
{
unsigned int version;
uint64_t systemId;
uint32_t controlVersion;
uint32_t catalogVersion;
unsigned int pageSize;
unsigned int walSegmentSize;
bool pageChecksum;
} PgControl;
/***********************************************************************************************************************************
Functions
***********************************************************************************************************************************/
PgControl pgControlFromFile(const String *pgPath);
PgControl pgControlFromBuffer(const Buffer *controlFile);
unsigned int pgVersionFromStr(const String *version);
String *pgVersionToStr(unsigned int version);
/***********************************************************************************************************************************
Test Functions
***********************************************************************************************************************************/
#ifdef DEBUG
Buffer *pgControlTestToBuffer(PgControl pgControl);
#endif
/***********************************************************************************************************************************
Macros for function logging
***********************************************************************************************************************************/
String *pgControlToLog(const PgControl *pgControl);
#define FUNCTION_DEBUG_PG_CONTROL_TYPE \
PgControl
#define FUNCTION_DEBUG_PG_CONTROL_FORMAT(value, buffer, bufferSize) \
FUNCTION_DEBUG_STRING_OBJECT_FORMAT(&value, pgControlToLog, buffer, bufferSize)
#endif