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Expose control file data via SQL accessible functions.
Add four new SQL accessible functions: pg_control_system(), pg_control_checkpoint(), pg_control_recovery(), and pg_control_init() which expose a subset of the control file data. Along the way move the code to read and validate the control file to src/common, where it can be shared by the new backend functions and the original pg_controldata frontend program. Patch by me, significant input, testing, and review by Michael Paquier.
This commit is contained in:
341
src/backend/utils/misc/pg_controldata.c
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341
src/backend/utils/misc/pg_controldata.c
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/*-------------------------------------------------------------------------
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*
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* pg_controldata.c
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*
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* Routines to expose the contents of the control data file via
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* a set of SQL functions.
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*
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* Portions Copyright (c) 1996-2016, 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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* IDENTIFICATION
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* src/backend/utils/misc/pg_controldata.c
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "funcapi.h"
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#include "miscadmin.h"
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#include "access/htup_details.h"
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#include "access/xlog_internal.h"
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#include "catalog/pg_control.h"
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#include "catalog/pg_type.h"
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#include "common/controldata_utils.h"
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#include "utils/builtins.h"
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#include "utils/pg_lsn.h"
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#include "utils/timestamp.h"
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Datum
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pg_control_system(PG_FUNCTION_ARGS)
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{
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Datum values[4];
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bool nulls[4];
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TupleDesc tupdesc;
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HeapTuple htup;
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ControlFileData *ControlFile;
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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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tupdesc = CreateTemplateTupleDesc(4, false);
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TupleDescInitEntry(tupdesc, (AttrNumber) 1, "pg_control_version",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 2, "catalog_version_no",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 3, "system_identifier",
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INT8OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 4, "pg_control_last_modified",
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TIMESTAMPTZOID, -1, 0);
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tupdesc = BlessTupleDesc(tupdesc);
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/* read the control file */
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ControlFile = get_controlfile(DataDir, NULL);
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values[0] = Int32GetDatum(ControlFile->pg_control_version);
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nulls[0] = false;
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values[1] = Int32GetDatum(ControlFile->catalog_version_no);
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nulls[1] = false;
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values[2] = Int64GetDatum(ControlFile->system_identifier);
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nulls[2] = false;
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values[3] = TimestampTzGetDatum(time_t_to_timestamptz(ControlFile->time));
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nulls[3] = false;
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htup = heap_form_tuple(tupdesc, values, nulls);
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PG_RETURN_DATUM(HeapTupleGetDatum(htup));
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}
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Datum
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pg_control_checkpoint(PG_FUNCTION_ARGS)
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{
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Datum values[19];
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bool nulls[19];
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TupleDesc tupdesc;
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HeapTuple htup;
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ControlFileData *ControlFile;
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XLogSegNo segno;
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char xlogfilename[MAXFNAMELEN];
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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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tupdesc = CreateTemplateTupleDesc(19, false);
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TupleDescInitEntry(tupdesc, (AttrNumber) 1, "checkpoint_location",
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LSNOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 2, "prior_location",
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LSNOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 3, "redo_location",
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LSNOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 4, "redo_wal_file",
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TEXTOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 5, "timeline_id",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 6, "prev_timeline_id",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 7, "full_page_writes",
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BOOLOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 8, "next_xid",
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TEXTOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 9, "next_oid",
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OIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 10, "next_multixact_id",
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XIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 11, "next_multi_offset",
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XIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 12, "oldest_xid",
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XIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 13, "oldest_xid_dbid",
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OIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 14, "oldest_active_xid",
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XIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 15, "oldest_multi_xid",
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XIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 16, "oldest_multi_dbid",
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OIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 17, "oldest_commit_ts_xid",
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XIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 18, "newest_commit_ts_xid",
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XIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 19, "checkpoint_time",
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TIMESTAMPTZOID, -1, 0);
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tupdesc = BlessTupleDesc(tupdesc);
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/* Read the control file. */
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ControlFile = get_controlfile(DataDir, NULL);
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/*
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* Calculate name of the WAL file containing the latest checkpoint's REDO
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* start point.
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*/
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XLByteToSeg(ControlFile->checkPointCopy.redo, segno);
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XLogFileName(xlogfilename, ControlFile->checkPointCopy.ThisTimeLineID, segno);
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/* Populate the values and null arrays */
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values[0] = LSNGetDatum(ControlFile->checkPoint);
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nulls[0] = false;
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values[1] = LSNGetDatum(ControlFile->prevCheckPoint);
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nulls[1] = false;
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values[2] = LSNGetDatum(ControlFile->checkPointCopy.redo);
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nulls[2] = false;
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values[3] = CStringGetTextDatum(xlogfilename);
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nulls[3] = false;
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values[4] = Int32GetDatum(ControlFile->checkPointCopy.ThisTimeLineID);
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nulls[4] = false;
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values[5] = Int32GetDatum(ControlFile->checkPointCopy.PrevTimeLineID);
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nulls[5] = false;
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values[6] = BoolGetDatum(ControlFile->checkPointCopy.fullPageWrites);
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nulls[6] = false;
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values[7] = CStringGetTextDatum(psprintf("%u:%u",
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ControlFile->checkPointCopy.nextXidEpoch,
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ControlFile->checkPointCopy.nextXid));
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nulls[7] = false;
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values[8] = ObjectIdGetDatum(ControlFile->checkPointCopy.nextOid);
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nulls[8] = false;
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values[9] = TransactionIdGetDatum(ControlFile->checkPointCopy.nextMulti);
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nulls[9] = false;
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values[10] = TransactionIdGetDatum(ControlFile->checkPointCopy.nextMultiOffset);
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nulls[10] = false;
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values[11] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestXid);
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nulls[11] = false;
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values[12] = ObjectIdGetDatum(ControlFile->checkPointCopy.oldestXidDB);
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nulls[12] = false;
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values[13] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestActiveXid);
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nulls[13] = false;
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values[14] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestMulti);
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nulls[14] = false;
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values[15] = ObjectIdGetDatum(ControlFile->checkPointCopy.oldestMultiDB);
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nulls[15] = false;
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values[16] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestCommitTsXid);
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nulls[16] = false;
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values[17] = TransactionIdGetDatum(ControlFile->checkPointCopy.newestCommitTsXid);
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nulls[17] = false;
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values[18] = TimestampTzGetDatum(
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time_t_to_timestamptz(ControlFile->checkPointCopy.time));
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nulls[18] = false;
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htup = heap_form_tuple(tupdesc, values, nulls);
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PG_RETURN_DATUM(HeapTupleGetDatum(htup));
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}
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Datum
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pg_control_recovery(PG_FUNCTION_ARGS)
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{
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Datum values[5];
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bool nulls[5];
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TupleDesc tupdesc;
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HeapTuple htup;
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ControlFileData *ControlFile;
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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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tupdesc = CreateTemplateTupleDesc(5, false);
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TupleDescInitEntry(tupdesc, (AttrNumber) 1, "min_recovery_end_location",
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LSNOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 2, "min_recovery_end_timeline",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 3, "backup_start_location",
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LSNOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 4, "backup_end_location",
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LSNOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 5, "end_of_backup_record_required",
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BOOLOID, -1, 0);
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tupdesc = BlessTupleDesc(tupdesc);
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/* read the control file */
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ControlFile = get_controlfile(DataDir, NULL);
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values[0] = LSNGetDatum(ControlFile->minRecoveryPoint);
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nulls[0] = false;
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values[1] = Int32GetDatum(ControlFile->minRecoveryPointTLI);
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nulls[1] = false;
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values[2] = LSNGetDatum(ControlFile->backupStartPoint);
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nulls[2] = false;
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values[3] = LSNGetDatum(ControlFile->backupEndPoint);
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nulls[3] = false;
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values[4] = BoolGetDatum(ControlFile->backupEndRequired);
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nulls[4] = false;
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htup = heap_form_tuple(tupdesc, values, nulls);
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PG_RETURN_DATUM(HeapTupleGetDatum(htup));
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}
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Datum
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pg_control_init(PG_FUNCTION_ARGS)
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{
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Datum values[13];
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bool nulls[13];
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TupleDesc tupdesc;
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HeapTuple htup;
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ControlFileData *ControlFile;
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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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tupdesc = CreateTemplateTupleDesc(13, false);
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TupleDescInitEntry(tupdesc, (AttrNumber) 1, "max_data_alignment",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 2, "database_block_size",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 3, "blocks_per_segment",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 4, "wal_block_size",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 5, "bytes_per_wal_segment",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 6, "max_identifier_length",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 7, "max_index_columns",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 8, "max_toast_chunk_size",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 9, "large_object_chunk_size",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 10, "bigint_timestamps",
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BOOLOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 11, "float4_pass_by_value",
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BOOLOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 12, "float8_pass_by_value",
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BOOLOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 13, "data_page_checksum_version",
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INT4OID, -1, 0);
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tupdesc = BlessTupleDesc(tupdesc);
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/* read the control file */
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ControlFile = get_controlfile(DataDir, NULL);
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values[0] = Int32GetDatum(ControlFile->maxAlign);
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nulls[0] = false;
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values[1] = Int32GetDatum(ControlFile->blcksz);
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nulls[1] = false;
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values[2] = Int32GetDatum(ControlFile->relseg_size);
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nulls[2] = false;
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values[3] = Int32GetDatum(ControlFile->xlog_blcksz);
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nulls[3] = false;
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values[4] = Int32GetDatum(ControlFile->xlog_seg_size);
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nulls[4] = false;
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values[5] = Int32GetDatum(ControlFile->nameDataLen);
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nulls[5] = false;
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values[6] = Int32GetDatum(ControlFile->indexMaxKeys);
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nulls[6] = false;
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values[7] = Int32GetDatum(ControlFile->toast_max_chunk_size);
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nulls[7] = false;
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values[8] = Int32GetDatum(ControlFile->loblksize);
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nulls[8] = false;
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values[9] = BoolGetDatum(ControlFile->enableIntTimes);
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nulls[9] = false;
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values[10] = BoolGetDatum(ControlFile->float4ByVal);
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nulls[10] = false;
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values[11] = BoolGetDatum(ControlFile->float8ByVal);
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nulls[11] = false;
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values[12] = Int32GetDatum(ControlFile->data_checksum_version);
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nulls[12] = false;
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htup = heap_form_tuple(tupdesc, values, nulls);
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PG_RETURN_DATUM(HeapTupleGetDatum(htup));
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}
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