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9fd45870c1
This replaces all MemSet() calls with struct initialization where that is easily and obviously possible. (For example, some cases have to worry about padding bits, so I left those.) (The same could be done with appropriate memset() calls, but this patch is part of an effort to phase out MemSet(), so it doesn't touch memset() calls.) Reviewed-by: Ranier Vilela <ranier.vf@gmail.com> Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org> Discussion: https://www.postgresql.org/message-id/9847b13c-b785-f4e2-75c3-12ec77a3b05c@enterprisedb.com
646 lines
17 KiB
C
646 lines
17 KiB
C
/*-------------------------------------------------------------------------
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*
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* xlogfuncs.c
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*
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* PostgreSQL write-ahead log manager user interface functions
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*
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* This file contains WAL control and information functions.
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*
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*
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* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/backend/access/transam/xlogfuncs.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include <unistd.h>
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#include "access/htup_details.h"
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#include "access/xlog_internal.h"
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#include "access/xlogrecovery.h"
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#include "access/xlogutils.h"
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#include "catalog/pg_type.h"
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#include "funcapi.h"
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#include "miscadmin.h"
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#include "pgstat.h"
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#include "replication/walreceiver.h"
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#include "storage/fd.h"
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#include "storage/ipc.h"
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#include "storage/smgr.h"
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#include "utils/builtins.h"
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#include "utils/guc.h"
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#include "utils/memutils.h"
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#include "utils/numeric.h"
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#include "utils/pg_lsn.h"
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#include "utils/timestamp.h"
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#include "utils/tuplestore.h"
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/*
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* Store label file and tablespace map during backups.
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*/
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static StringInfo label_file;
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static StringInfo tblspc_map_file;
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/*
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* pg_backup_start: set up for taking an on-line backup dump
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*
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* Essentially what this does is to create a backup label file in $PGDATA,
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* where it will be archived as part of the backup dump. The label file
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* contains the user-supplied label string (typically this would be used
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* to tell where the backup dump will be stored) and the starting time and
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* starting WAL location for the dump.
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*
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* Permission checking for this function is managed through the normal
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* GRANT system.
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*/
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Datum
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pg_backup_start(PG_FUNCTION_ARGS)
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{
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text *backupid = PG_GETARG_TEXT_PP(0);
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bool fast = PG_GETARG_BOOL(1);
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char *backupidstr;
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XLogRecPtr startpoint;
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SessionBackupState status = get_backup_status();
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MemoryContext oldcontext;
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backupidstr = text_to_cstring(backupid);
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if (status == SESSION_BACKUP_RUNNING)
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("a backup is already in progress in this session")));
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/*
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* Label file and tablespace map file need to be long-lived, since they
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* are read in pg_backup_stop.
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*/
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oldcontext = MemoryContextSwitchTo(TopMemoryContext);
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label_file = makeStringInfo();
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tblspc_map_file = makeStringInfo();
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MemoryContextSwitchTo(oldcontext);
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register_persistent_abort_backup_handler();
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startpoint = do_pg_backup_start(backupidstr, fast, NULL, label_file,
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NULL, tblspc_map_file);
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PG_RETURN_LSN(startpoint);
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}
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/*
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* pg_backup_stop: finish taking an on-line backup.
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*
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* The first parameter (variable 'waitforarchive'), which is optional,
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* allows the user to choose if they want to wait for the WAL to be archived
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* or if we should just return as soon as the WAL record is written.
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*
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* Permission checking for this function is managed through the normal
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* GRANT system.
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*/
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Datum
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pg_backup_stop(PG_FUNCTION_ARGS)
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{
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#define PG_STOP_BACKUP_V2_COLS 3
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TupleDesc tupdesc;
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Datum values[PG_STOP_BACKUP_V2_COLS] = {0};
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bool nulls[PG_STOP_BACKUP_V2_COLS] = {0};
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bool waitforarchive = PG_GETARG_BOOL(0);
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XLogRecPtr stoppoint;
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SessionBackupState status = get_backup_status();
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/* Initialize attributes information in the tuple descriptor */
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if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
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elog(ERROR, "return type must be a row type");
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if (status != SESSION_BACKUP_RUNNING)
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("backup is not in progress"),
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errhint("Did you call pg_backup_start()?")));
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/*
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* Stop the backup. Return a copy of the backup label and tablespace map
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* so they can be written to disk by the caller.
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*/
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stoppoint = do_pg_backup_stop(label_file->data, waitforarchive, NULL);
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values[0] = LSNGetDatum(stoppoint);
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values[1] = CStringGetTextDatum(label_file->data);
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values[2] = CStringGetTextDatum(tblspc_map_file->data);
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/* Free structures allocated in TopMemoryContext */
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pfree(label_file->data);
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pfree(label_file);
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label_file = NULL;
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pfree(tblspc_map_file->data);
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pfree(tblspc_map_file);
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tblspc_map_file = NULL;
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/* Returns the record as Datum */
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PG_RETURN_DATUM(HeapTupleGetDatum(heap_form_tuple(tupdesc, values, nulls)));
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}
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/*
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* pg_switch_wal: switch to next xlog file
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*
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* Permission checking for this function is managed through the normal
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* GRANT system.
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*/
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Datum
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pg_switch_wal(PG_FUNCTION_ARGS)
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{
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XLogRecPtr switchpoint;
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if (RecoveryInProgress())
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("recovery is in progress"),
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errhint("WAL control functions cannot be executed during recovery.")));
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switchpoint = RequestXLogSwitch(false);
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/*
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* As a convenience, return the WAL location of the switch record
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*/
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PG_RETURN_LSN(switchpoint);
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}
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/*
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* pg_create_restore_point: a named point for restore
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*
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* Permission checking for this function is managed through the normal
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* GRANT system.
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*/
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Datum
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pg_create_restore_point(PG_FUNCTION_ARGS)
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{
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text *restore_name = PG_GETARG_TEXT_PP(0);
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char *restore_name_str;
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XLogRecPtr restorepoint;
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if (RecoveryInProgress())
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("recovery is in progress"),
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errhint("WAL control functions cannot be executed during recovery.")));
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if (!XLogIsNeeded())
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("WAL level not sufficient for creating a restore point"),
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errhint("wal_level must be set to \"replica\" or \"logical\" at server start.")));
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restore_name_str = text_to_cstring(restore_name);
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if (strlen(restore_name_str) >= MAXFNAMELEN)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("value too long for restore point (maximum %d characters)", MAXFNAMELEN - 1)));
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restorepoint = XLogRestorePoint(restore_name_str);
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/*
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* As a convenience, return the WAL location of the restore point record
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*/
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PG_RETURN_LSN(restorepoint);
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}
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/*
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* Report the current WAL write location (same format as pg_backup_start etc)
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*
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* This is useful for determining how much of WAL is visible to an external
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* archiving process. Note that the data before this point is written out
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* to the kernel, but is not necessarily synced to disk.
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*/
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Datum
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pg_current_wal_lsn(PG_FUNCTION_ARGS)
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{
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XLogRecPtr current_recptr;
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if (RecoveryInProgress())
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("recovery is in progress"),
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errhint("WAL control functions cannot be executed during recovery.")));
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current_recptr = GetXLogWriteRecPtr();
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PG_RETURN_LSN(current_recptr);
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}
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/*
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* Report the current WAL insert location (same format as pg_backup_start etc)
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*
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* This function is mostly for debugging purposes.
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*/
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Datum
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pg_current_wal_insert_lsn(PG_FUNCTION_ARGS)
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{
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XLogRecPtr current_recptr;
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if (RecoveryInProgress())
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("recovery is in progress"),
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errhint("WAL control functions cannot be executed during recovery.")));
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current_recptr = GetXLogInsertRecPtr();
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PG_RETURN_LSN(current_recptr);
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}
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/*
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* Report the current WAL flush location (same format as pg_backup_start etc)
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*
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* This function is mostly for debugging purposes.
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*/
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Datum
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pg_current_wal_flush_lsn(PG_FUNCTION_ARGS)
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{
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XLogRecPtr current_recptr;
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if (RecoveryInProgress())
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("recovery is in progress"),
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errhint("WAL control functions cannot be executed during recovery.")));
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current_recptr = GetFlushRecPtr(NULL);
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PG_RETURN_LSN(current_recptr);
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}
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/*
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* Report the last WAL receive location (same format as pg_backup_start etc)
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*
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* This is useful for determining how much of WAL is guaranteed to be received
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* and synced to disk by walreceiver.
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*/
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Datum
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pg_last_wal_receive_lsn(PG_FUNCTION_ARGS)
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{
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XLogRecPtr recptr;
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recptr = GetWalRcvFlushRecPtr(NULL, NULL);
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if (recptr == 0)
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PG_RETURN_NULL();
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PG_RETURN_LSN(recptr);
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}
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/*
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* Report the last WAL replay location (same format as pg_backup_start etc)
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*
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* This is useful for determining how much of WAL is visible to read-only
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* connections during recovery.
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*/
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Datum
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pg_last_wal_replay_lsn(PG_FUNCTION_ARGS)
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{
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XLogRecPtr recptr;
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recptr = GetXLogReplayRecPtr(NULL);
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if (recptr == 0)
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PG_RETURN_NULL();
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PG_RETURN_LSN(recptr);
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}
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/*
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* Compute an xlog file name and decimal byte offset given a WAL location,
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* such as is returned by pg_backup_stop() or pg_switch_wal().
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*
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* Note that a location exactly at a segment boundary is taken to be in
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* the previous segment. This is usually the right thing, since the
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* expected usage is to determine which xlog file(s) are ready to archive.
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*/
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Datum
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pg_walfile_name_offset(PG_FUNCTION_ARGS)
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{
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XLogSegNo xlogsegno;
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uint32 xrecoff;
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XLogRecPtr locationpoint = PG_GETARG_LSN(0);
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char xlogfilename[MAXFNAMELEN];
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Datum values[2];
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bool isnull[2];
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TupleDesc resultTupleDesc;
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HeapTuple resultHeapTuple;
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Datum result;
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if (RecoveryInProgress())
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("recovery is in progress"),
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errhint("%s cannot be executed during recovery.",
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"pg_walfile_name_offset()")));
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/*
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* Construct a tuple descriptor for the result row. This must match this
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* function's pg_proc entry!
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*/
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resultTupleDesc = CreateTemplateTupleDesc(2);
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TupleDescInitEntry(resultTupleDesc, (AttrNumber) 1, "file_name",
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TEXTOID, -1, 0);
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TupleDescInitEntry(resultTupleDesc, (AttrNumber) 2, "file_offset",
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INT4OID, -1, 0);
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resultTupleDesc = BlessTupleDesc(resultTupleDesc);
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/*
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* xlogfilename
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*/
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XLByteToPrevSeg(locationpoint, xlogsegno, wal_segment_size);
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XLogFileName(xlogfilename, GetWALInsertionTimeLine(), xlogsegno,
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wal_segment_size);
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values[0] = CStringGetTextDatum(xlogfilename);
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isnull[0] = false;
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/*
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* offset
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*/
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xrecoff = XLogSegmentOffset(locationpoint, wal_segment_size);
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values[1] = UInt32GetDatum(xrecoff);
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isnull[1] = false;
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/*
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* Tuple jam: Having first prepared your Datums, then squash together
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*/
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resultHeapTuple = heap_form_tuple(resultTupleDesc, values, isnull);
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result = HeapTupleGetDatum(resultHeapTuple);
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PG_RETURN_DATUM(result);
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}
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/*
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* Compute an xlog file name given a WAL location,
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* such as is returned by pg_backup_stop() or pg_switch_wal().
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*/
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Datum
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pg_walfile_name(PG_FUNCTION_ARGS)
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{
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XLogSegNo xlogsegno;
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XLogRecPtr locationpoint = PG_GETARG_LSN(0);
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char xlogfilename[MAXFNAMELEN];
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if (RecoveryInProgress())
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("recovery is in progress"),
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errhint("%s cannot be executed during recovery.",
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"pg_walfile_name()")));
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XLByteToPrevSeg(locationpoint, xlogsegno, wal_segment_size);
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XLogFileName(xlogfilename, GetWALInsertionTimeLine(), xlogsegno,
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wal_segment_size);
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PG_RETURN_TEXT_P(cstring_to_text(xlogfilename));
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}
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/*
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* pg_wal_replay_pause - Request to pause recovery
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*
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* Permission checking for this function is managed through the normal
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* GRANT system.
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*/
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Datum
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pg_wal_replay_pause(PG_FUNCTION_ARGS)
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{
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if (!RecoveryInProgress())
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("recovery is not in progress"),
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errhint("Recovery control functions can only be executed during recovery.")));
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if (PromoteIsTriggered())
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("standby promotion is ongoing"),
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errhint("%s cannot be executed after promotion is triggered.",
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"pg_wal_replay_pause()")));
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SetRecoveryPause(true);
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/* wake up the recovery process so that it can process the pause request */
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WakeupRecovery();
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PG_RETURN_VOID();
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}
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/*
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* pg_wal_replay_resume - resume recovery now
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*
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* Permission checking for this function is managed through the normal
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* GRANT system.
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*/
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Datum
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pg_wal_replay_resume(PG_FUNCTION_ARGS)
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{
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if (!RecoveryInProgress())
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("recovery is not in progress"),
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errhint("Recovery control functions can only be executed during recovery.")));
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if (PromoteIsTriggered())
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("standby promotion is ongoing"),
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errhint("%s cannot be executed after promotion is triggered.",
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"pg_wal_replay_resume()")));
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SetRecoveryPause(false);
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PG_RETURN_VOID();
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}
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/*
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* pg_is_wal_replay_paused
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*/
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Datum
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pg_is_wal_replay_paused(PG_FUNCTION_ARGS)
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{
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if (!RecoveryInProgress())
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("recovery is not in progress"),
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errhint("Recovery control functions can only be executed during recovery.")));
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PG_RETURN_BOOL(GetRecoveryPauseState() != RECOVERY_NOT_PAUSED);
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}
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/*
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* pg_get_wal_replay_pause_state - Returns the recovery pause state.
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*
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* Returned values:
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*
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* 'not paused' - if pause is not requested
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* 'pause requested' - if pause is requested but recovery is not yet paused
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* 'paused' - if recovery is paused
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*/
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Datum
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pg_get_wal_replay_pause_state(PG_FUNCTION_ARGS)
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{
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char *statestr = NULL;
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if (!RecoveryInProgress())
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("recovery is not in progress"),
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errhint("Recovery control functions can only be executed during recovery.")));
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/* get the recovery pause state */
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switch (GetRecoveryPauseState())
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{
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case RECOVERY_NOT_PAUSED:
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statestr = "not paused";
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break;
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case RECOVERY_PAUSE_REQUESTED:
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statestr = "pause requested";
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break;
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case RECOVERY_PAUSED:
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statestr = "paused";
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break;
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}
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Assert(statestr != NULL);
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PG_RETURN_TEXT_P(cstring_to_text(statestr));
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}
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/*
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* Returns timestamp of latest processed commit/abort record.
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|
*
|
|
* When the server has been started normally without recovery the function
|
|
* returns NULL.
|
|
*/
|
|
Datum
|
|
pg_last_xact_replay_timestamp(PG_FUNCTION_ARGS)
|
|
{
|
|
TimestampTz xtime;
|
|
|
|
xtime = GetLatestXTime();
|
|
if (xtime == 0)
|
|
PG_RETURN_NULL();
|
|
|
|
PG_RETURN_TIMESTAMPTZ(xtime);
|
|
}
|
|
|
|
/*
|
|
* Returns bool with current recovery mode, a global state.
|
|
*/
|
|
Datum
|
|
pg_is_in_recovery(PG_FUNCTION_ARGS)
|
|
{
|
|
PG_RETURN_BOOL(RecoveryInProgress());
|
|
}
|
|
|
|
/*
|
|
* Compute the difference in bytes between two WAL locations.
|
|
*/
|
|
Datum
|
|
pg_wal_lsn_diff(PG_FUNCTION_ARGS)
|
|
{
|
|
Datum result;
|
|
|
|
result = DirectFunctionCall2(pg_lsn_mi,
|
|
PG_GETARG_DATUM(0),
|
|
PG_GETARG_DATUM(1));
|
|
|
|
PG_RETURN_NUMERIC(result);
|
|
}
|
|
|
|
/*
|
|
* Promotes a standby server.
|
|
*
|
|
* A result of "true" means that promotion has been completed if "wait" is
|
|
* "true", or initiated if "wait" is false.
|
|
*/
|
|
Datum
|
|
pg_promote(PG_FUNCTION_ARGS)
|
|
{
|
|
bool wait = PG_GETARG_BOOL(0);
|
|
int wait_seconds = PG_GETARG_INT32(1);
|
|
FILE *promote_file;
|
|
int i;
|
|
|
|
if (!RecoveryInProgress())
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
|
|
errmsg("recovery is not in progress"),
|
|
errhint("Recovery control functions can only be executed during recovery.")));
|
|
|
|
if (wait_seconds <= 0)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
|
|
errmsg("\"wait_seconds\" must not be negative or zero")));
|
|
|
|
/* create the promote signal file */
|
|
promote_file = AllocateFile(PROMOTE_SIGNAL_FILE, "w");
|
|
if (!promote_file)
|
|
ereport(ERROR,
|
|
(errcode_for_file_access(),
|
|
errmsg("could not create file \"%s\": %m",
|
|
PROMOTE_SIGNAL_FILE)));
|
|
|
|
if (FreeFile(promote_file))
|
|
ereport(ERROR,
|
|
(errcode_for_file_access(),
|
|
errmsg("could not write file \"%s\": %m",
|
|
PROMOTE_SIGNAL_FILE)));
|
|
|
|
/* signal the postmaster */
|
|
if (kill(PostmasterPid, SIGUSR1) != 0)
|
|
{
|
|
ereport(WARNING,
|
|
(errmsg("failed to send signal to postmaster: %m")));
|
|
(void) unlink(PROMOTE_SIGNAL_FILE);
|
|
PG_RETURN_BOOL(false);
|
|
}
|
|
|
|
/* return immediately if waiting was not requested */
|
|
if (!wait)
|
|
PG_RETURN_BOOL(true);
|
|
|
|
/* wait for the amount of time wanted until promotion */
|
|
#define WAITS_PER_SECOND 10
|
|
for (i = 0; i < WAITS_PER_SECOND * wait_seconds; i++)
|
|
{
|
|
int rc;
|
|
|
|
ResetLatch(MyLatch);
|
|
|
|
if (!RecoveryInProgress())
|
|
PG_RETURN_BOOL(true);
|
|
|
|
CHECK_FOR_INTERRUPTS();
|
|
|
|
rc = WaitLatch(MyLatch,
|
|
WL_LATCH_SET | WL_TIMEOUT | WL_POSTMASTER_DEATH,
|
|
1000L / WAITS_PER_SECOND,
|
|
WAIT_EVENT_PROMOTE);
|
|
|
|
/*
|
|
* Emergency bailout if postmaster has died. This is to avoid the
|
|
* necessity for manual cleanup of all postmaster children.
|
|
*/
|
|
if (rc & WL_POSTMASTER_DEATH)
|
|
PG_RETURN_BOOL(false);
|
|
}
|
|
|
|
ereport(WARNING,
|
|
(errmsg_plural("server did not promote within %d second",
|
|
"server did not promote within %d seconds",
|
|
wait_seconds,
|
|
wait_seconds)));
|
|
PG_RETURN_BOOL(false);
|
|
}
|