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Add on-demand WAL download to slotfuncs (v15) #467

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Merged
save-buffer merged 1 commit into from
Aug 12, 2024
Merged

Add on-demand WAL download to slotfuncs (v15) #467

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14 changes: 11 additions & 3 deletions src/backend/replication/slotfuncs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,8 @@
#include "utils/pg_lsn.h"
#include "utils/resowner.h"

void (*SlotFuncs_Custom_XLogReaderRoutines)(XLogReaderRoutine *xlr);

/*
* Helper function for creating a new physical replication slot with
* given arguments. Note that this function doesn't release the created
Expand Down Expand Up @@ -469,6 +471,14 @@ pg_logical_replication_slot_advance(XLogRecPtr moveto)

PG_TRY();
{
XLogReaderRoutine xlr;
xlr.page_read = read_local_xlog_page;
xlr.segment_open = wal_segment_open;
xlr.segment_close = wal_segment_close;

if (SlotFuncs_Custom_XLogReaderRoutines != NULL)
SlotFuncs_Custom_XLogReaderRoutines(&xlr);

/*
* Create our decoding context in fast_forward mode, passing start_lsn
* as InvalidXLogRecPtr, so that we start processing from my slot's
Expand All @@ -477,9 +487,7 @@ pg_logical_replication_slot_advance(XLogRecPtr moveto)
ctx = CreateDecodingContext(InvalidXLogRecPtr,
NIL,
true, /* fast_forward */
XL_ROUTINE(.page_read = read_local_xlog_page,
.segment_open = wal_segment_open,
.segment_close = wal_segment_close),
&xlr,
NULL, NULL, NULL);

/*
Expand Down
2 changes: 2 additions & 0 deletions src/include/replication/slot.h
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Original file line number Diff line number Diff line change
Expand Up @@ -168,6 +168,8 @@ typedef struct ReplicationSlot
#define SlotIsPhysical(slot) ((slot)->data.database == InvalidOid)
#define SlotIsLogical(slot) ((slot)->data.database != InvalidOid)

extern void (*SlotFuncs_Custom_XLogReaderRoutines)(XLogReaderRoutine *xlr);

/*
* Shared memory control area for all of replication slots.
*/
Expand Down