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/*
* timeline.h
*
* Functions for reading and writing timeline history files.
*
* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/access/timeline.h
*/
#ifndef TIMELINE_H
#define TIMELINE_H
#include "access/xlogdefs.h"
#include "nodes/pg_list.h"
/*
* A list of these structs describes the timeline history of the server. Each
* TimeLineHistoryEntry represents a piece of WAL belonging to the history,
* from newest to oldest. All WAL locations between 'begin' and 'end' belong to
* the timeline represented by the entry. Together the 'begin' and 'end'
* pointers of all the entries form a contiguous line from beginning of time
* to infinity.
*/
typedef struct
{
TimeLineID tli;
XLogRecPtr begin; /* inclusive */
XLogRecPtr end; /* exclusive, InvalidXLogRecPtr means infinity */
} TimeLineHistoryEntry;
extern List *readTimeLineHistory(TimeLineID targetTLI);
extern bool existsTimeLineHistory(TimeLineID probeTLI);
extern TimeLineID findNewestTimeLine(TimeLineID startTLI);
extern void writeTimeLineHistory(TimeLineID newTLI, TimeLineID parentTLI,
XLogRecPtr switchpoint, char *reason);
extern void writeTimeLineHistoryFile(TimeLineID tli, char *content, int size);
extern void restoreTimeLineHistoryFiles(TimeLineID begin, TimeLineID end);
extern bool tliInHistory(TimeLineID tli, List *expectedTLEs);
extern TimeLineID tliOfPointInHistory(XLogRecPtr ptr, List *history);
extern XLogRecPtr tliSwitchPoint(TimeLineID tli, List *history,
TimeLineID *nextTLI);
#endif /* TIMELINE_H */
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