C++ (Cpp) ParseCommitRecord Examples

Example #1

File: decode.cpp Project: EccentricLoggers/peloton

/*
 * Handle rmgr XACT_ID records for DecodeRecordIntoReorderBuffer().
 */
static void
DecodeXactOp(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
{
	SnapBuild  *builder = ctx->snapshot_builder;
	ReorderBuffer *reorder = ctx->reorder;
	XLogReaderState *r = buf->record;
	uint8		info = XLogRecGetInfo(r) & XLOG_XACT_OPMASK;

	/* no point in doing anything yet, data could not be decoded anyway */
	if (SnapBuildCurrentState(builder) < SNAPBUILD_FULL_SNAPSHOT)
		return;

	switch (info)
	{
		case XLOG_XACT_COMMIT:
		case XLOG_XACT_COMMIT_PREPARED:
			{
				xl_xact_commit *xlrec;
				xl_xact_parsed_commit parsed;
				TransactionId xid;

				xlrec = (xl_xact_commit *) XLogRecGetData(r);
				ParseCommitRecord(XLogRecGetInfo(buf->record), xlrec, &parsed);

				if (!TransactionIdIsValid(parsed.twophase_xid))
					xid = XLogRecGetXid(r);
				else
					xid = parsed.twophase_xid;

				DecodeCommit(ctx, buf, &parsed, xid);
				break;
			}
		case XLOG_XACT_ABORT:
		case XLOG_XACT_ABORT_PREPARED:
			{
				xl_xact_abort *xlrec;
				xl_xact_parsed_abort parsed;
				TransactionId xid;

				xlrec = (xl_xact_abort *) XLogRecGetData(r);
				ParseAbortRecord(XLogRecGetInfo(buf->record), xlrec, &parsed);

				if (!TransactionIdIsValid(parsed.twophase_xid))
					xid = XLogRecGetXid(r);
				else
					xid = parsed.twophase_xid;

				DecodeAbort(ctx, buf, &parsed, xid);
				break;
			}
		case XLOG_XACT_ASSIGNMENT:
			{
				xl_xact_assignment *xlrec;
				int			i;
				TransactionId *sub_xid;

				xlrec = (xl_xact_assignment *) XLogRecGetData(r);

				sub_xid = &xlrec->xsub[0];

				for (i = 0; i < xlrec->nsubxacts; i++)
				{
					ReorderBufferAssignChild(reorder, xlrec->xtop,
											 *(sub_xid++), buf->origptr);
				}
				break;
			}
		case XLOG_XACT_PREPARE:

			/*
			 * Currently decoding ignores PREPARE TRANSACTION and will just
			 * decode the transaction when the COMMIT PREPARED is sent or
			 * throw away the transaction's contents when a ROLLBACK PREPARED
			 * is received. In the future we could add code to expose prepared
			 * transactions in the changestream allowing for a kind of
			 * distributed 2PC.
			 */
			break;
		default:
			elog(ERROR, "unexpected RM_XACT_ID record type: %u", info);
	}
}

Example #2

File: xactdesc.c Project: Marketcircle/postgres

static void
xact_desc_commit(StringInfo buf, uint8 info, xl_xact_commit *xlrec, RepOriginId origin_id)
{
	xl_xact_parsed_commit parsed;
	int			i;

	ParseCommitRecord(info, xlrec, &parsed);

	/* If this is a prepared xact, show the xid of the original xact */
	if (TransactionIdIsValid(parsed.twophase_xid))
		appendStringInfo(buf, "%u: ", parsed.twophase_xid);

	appendStringInfoString(buf, timestamptz_to_str(xlrec->xact_time));

	if (parsed.nrels > 0)
	{
		appendStringInfoString(buf, "; rels:");
		for (i = 0; i < parsed.nrels; i++)
		{
			char	   *path = relpathperm(parsed.xnodes[i], MAIN_FORKNUM);

			appendStringInfo(buf, " %s", path);
			pfree(path);
		}
	}
	if (parsed.nsubxacts > 0)
	{
		appendStringInfoString(buf, "; subxacts:");
		for (i = 0; i < parsed.nsubxacts; i++)
			appendStringInfo(buf, " %u", parsed.subxacts[i]);
	}
	if (parsed.nmsgs > 0)
	{
		if (XactCompletionRelcacheInitFileInval(parsed.xinfo))
			appendStringInfo(buf, "; relcache init file inval dbid %u tsid %u",
							 parsed.dbId, parsed.tsId);

		appendStringInfoString(buf, "; inval msgs:");
		for (i = 0; i < parsed.nmsgs; i++)
		{
			SharedInvalidationMessage *msg = &parsed.msgs[i];

			if (msg->id >= 0)
				appendStringInfo(buf, " catcache %d", msg->id);
			else if (msg->id == SHAREDINVALCATALOG_ID)
				appendStringInfo(buf, " catalog %u", msg->cat.catId);
			else if (msg->id == SHAREDINVALRELCACHE_ID)
				appendStringInfo(buf, " relcache %u", msg->rc.relId);
			/* not expected, but print something anyway */
			else if (msg->id == SHAREDINVALSMGR_ID)
				appendStringInfoString(buf, " smgr");
			/* not expected, but print something anyway */
			else if (msg->id == SHAREDINVALRELMAP_ID)
				appendStringInfoString(buf, " relmap");
			else if (msg->id == SHAREDINVALSNAPSHOT_ID)
				appendStringInfo(buf, " snapshot %u", msg->sn.relId);
			else
				appendStringInfo(buf, " unknown id %d", msg->id);
		}
	}

	if (XactCompletionForceSyncCommit(parsed.xinfo))
		appendStringInfo(buf, "; sync");

	if (parsed.xinfo & XACT_XINFO_HAS_ORIGIN)
	{
		appendStringInfo(buf, "; origin: node %u, lsn %X/%X, at %s",
						 origin_id,
						 (uint32)(parsed.origin_lsn >> 32),
						 (uint32)parsed.origin_lsn,
						 timestamptz_to_str(parsed.origin_timestamp));
	}