add origin info to prepare

Author: kelvich

src/backend/access/transam/twophase.c

@@ -1022,6 +1022,9 @@ EndPrepare(GlobalTransaction gxact)
 {
 	TwoPhaseFileHeader *hdr;
 	StateFileChunk *record;
+	xl_xact_origin xl_origin;
+	xl_xact_xinfo xl_xinfo;
+	uint8		info = XLOG_XACT_PREPARE;
 
 	/* Add the end sentinel to the list of 2PC records */
 	RegisterTwoPhaseRecord(TWOPHASE_RM_END_ID, 0,
@@ -1059,12 +1062,33 @@ EndPrepare(GlobalTransaction gxact)
 
 	START_CRIT_SECTION();
 
+	/* dump transaction origin information */
+	if (replorigin_session_origin != InvalidRepOriginId)
+	{
+		xl_xinfo.xinfo |= XACT_XINFO_HAS_ORIGIN;
+
+		xl_origin.origin_lsn = replorigin_session_origin_lsn;
+		xl_origin.origin_timestamp = replorigin_session_origin_timestamp;
+	}
+
+	if (xl_xinfo.xinfo != 0)
+		info |= XLOG_XACT_HAS_INFO;
+
 	MyPgXact->delayChkpt = true;
 
 	XLogBeginInsert();
 	for (record = records.head; record != NULL; record = record->next)
 		XLogRegisterData(record->data, record->len);
-	gxact->prepare_end_lsn = XLogInsert(RM_XACT_ID, XLOG_XACT_PREPARE);
+
+	if (xl_xinfo.xinfo != 0)
+		XLogRegisterData((char *) (&xl_xinfo.xinfo), sizeof(xl_xinfo.xinfo));
+
+	if (xl_xinfo.xinfo & XACT_XINFO_HAS_ORIGIN)
+		XLogRegisterData((char *) (&xl_origin), sizeof(xl_xact_origin));
+
+	XLogIncludeOrigin();
+
+	gxact->prepare_end_lsn = XLogInsert(RM_XACT_ID, info);
 	XLogFlush(gxact->prepare_end_lsn);
 
 	/* If we crash now, we have prepared: WAL replay will fix things */
@@ -1269,6 +1293,31 @@ ParsePrepareRecord(uint8 info, char *xlrec, xl_xact_parsed_prepare *parsed)
 
 	parsed->msgs = (SharedInvalidationMessage *) bufptr;
 	bufptr += MAXALIGN(hdr->ninvalmsgs * sizeof(SharedInvalidationMessage));
+
+	/*
+	 * Parse xinfo now.
+	 */
+
+	parsed->xinfo = 0;
+
+	if (info & XLOG_XACT_HAS_INFO)
+	{
+		xl_xact_xinfo *xl_xinfo = (xl_xact_xinfo *) bufptr;
+		parsed->xinfo = xl_xinfo->xinfo;
+		bufptr += sizeof(xl_xact_xinfo);
+	}
+
+
+	if (parsed->xinfo & XACT_XINFO_HAS_ORIGIN)
+	{
+		xl_xact_origin xl_origin;
+		/* we're only guaranteed 4 byte alignment, so copy onto stack */
+		memcpy(&xl_origin, bufptr, sizeof(xl_origin));
+		parsed->origin_lsn = xl_origin.origin_lsn;
+		parsed->origin_timestamp = xl_origin.origin_timestamp;
+		bufptr += sizeof(xl_xact_origin);
+	}
+
 }
 
 

src/backend/replication/logical/decode.c

@@ -581,6 +581,13 @@ DecodePrepare(LogicalDecodingContext *ctx, XLogRecordBuffer *buf,
 	XLogRecPtr	origin_id = XLogRecGetOrigin(buf->record);
 	int			i;
 	TransactionId xid = parsed->twophase_xid;
+
+	if (parsed->xinfo & XACT_XINFO_HAS_ORIGIN)
+	{
+		origin_lsn = parsed->origin_lsn;
+		commit_time = parsed->origin_timestamp;
+	}
+
 	strcpy(ctx->reorder->gid, parsed->twophase_gid);
 
 	/*

src/include/access/xact.h

@@ -304,6 +304,8 @@ typedef struct xl_xact_parsed_commit
 
 typedef struct xl_xact_parsed_prepare
 {
+	uint32		xinfo;
+
 	Oid			dbId;			/* MyDatabaseId */
 
 	int			nsubxacts;
@@ -317,6 +319,9 @@ typedef struct xl_xact_parsed_prepare
 
 	TransactionId twophase_xid;
 	char 		twophase_gid[GIDSIZE];
+
+	XLogRecPtr	origin_lsn;
+	TimestampTz origin_timestamp;
 } xl_xact_parsed_prepare;
 
 typedef struct xl_xact_parsed_abort