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Add a xid argument to the filter_prepare callback for output plugins.

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Along with gid, this provides a different way to identify the transaction.
The users that use xid in some way to prepare the transactions can use it
to filter prepare transactions. The later commands COMMIT PREPARED or
ROLLBACK PREPARED carries both identifiers, providing an output plugin the
choice of what to use.

Author: Markus Wanner
Reviewed-by: Vignesh C, Amit Kapila
Discussion: https://postgr.es/m/ee280000-7355-c4dc-e47b-2436e7be959c@enterprisedb.com
This commit is contained in:
Amit Kapila
2021-03-30 10:34:43 +05:30
parent bc2797ebb1
commit f64ea6dc5c
6 changed files with 38 additions and 21 deletions
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17
src/backend/replication/logical/decode.c
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@ -80,7 +80,8 @@ static void DecodePrepare(LogicalDecodingContext *ctx, XLogRecordBuffer *buf,
static void DecodeXLogTuple(char *data, Size len, ReorderBufferTupleBuf *tup);
/* helper functions for decoding transactions */
static inline bool FilterPrepare(LogicalDecodingContext *ctx, const char *gid);
static inline bool FilterPrepare(LogicalDecodingContext *ctx,
TransactionId xid, const char *gid);
static bool DecodeTXNNeedSkip(LogicalDecodingContext *ctx,
XLogRecordBuffer *buf, Oid dbId,
RepOriginId origin_id);
@ -271,7 +272,8 @@ DecodeXactOp(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
* doesn't filter the transaction at prepare time.
*/
if (info == XLOG_XACT_COMMIT_PREPARED)
two_phase = !(FilterPrepare(ctx, parsed.twophase_gid));
two_phase = !(FilterPrepare(ctx, xid,
parsed.twophase_gid));
DecodeCommit(ctx, buf, &parsed, xid, two_phase);
break;
@ -298,7 +300,8 @@ DecodeXactOp(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
* doesn't filter the transaction at prepare time.
*/
if (info == XLOG_XACT_ABORT_PREPARED)
two_phase = !(FilterPrepare(ctx, parsed.twophase_gid));
two_phase = !(FilterPrepare(ctx, xid,
parsed.twophase_gid));
DecodeAbort(ctx, buf, &parsed, xid, two_phase);
break;
@ -355,7 +358,8 @@ DecodeXactOp(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
* manner iff output plugin supports two-phase commits and
* doesn't filter the transaction at prepare time.
*/
if (FilterPrepare(ctx, parsed.twophase_gid))
if (FilterPrepare(ctx, parsed.twophase_xid,
parsed.twophase_gid))
{
ReorderBufferProcessXid(reorder, parsed.twophase_xid,
buf->origptr);
@ -581,7 +585,8 @@ DecodeHeapOp(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
* this transaction as a regular commit later.
*/
static inline bool
FilterPrepare(LogicalDecodingContext *ctx, const char *gid)
FilterPrepare(LogicalDecodingContext *ctx, TransactionId xid,
const char *gid)
{
/*
* Skip if decoding of two-phase transactions at PREPARE time is not
@ -599,7 +604,7 @@ FilterPrepare(LogicalDecodingContext *ctx, const char *gid)
if (ctx->callbacks.filter_prepare_cb == NULL)
return false;
return filter_prepare_cb_wrapper(ctx, gid);
return filter_prepare_cb_wrapper(ctx, xid, gid);
}
static inline bool