1 files changed, 52 insertions, 0 deletions
diff --git a/src/backend/access/rmgrdesc/logicalmsgdesc.c b/src/backend/access/rmgrdesc/logicalmsgdesc.c
new file mode 100644
index 0000000..d64ce2e
--- /dev/null
+++ b/src/backend/access/rmgrdesc/logicalmsgdesc.c
@@ -0,0 +1,52 @@
+/*-------------------------------------------------------------------------
+ *
+ * logicalmsgdesc.c
+ *	  rmgr descriptor routines for replication/logical/message.c
+ *
+ * Portions Copyright (c) 2015-2021, PostgreSQL Global Development Group
+ *
+ *
+ * IDENTIFICATION
+ *	  src/backend/access/rmgrdesc/logicalmsgdesc.c
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "replication/message.h"
+
+void
+logicalmsg_desc(StringInfo buf, XLogReaderState *record)
+{
+	char	   *rec = XLogRecGetData(record);
+	uint8		info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
+
+	if (info == XLOG_LOGICAL_MESSAGE)
+	{
+		xl_logical_message *xlrec = (xl_logical_message *) rec;
+		char	   *prefix = xlrec->message;
+		char	   *message = xlrec->message + xlrec->prefix_size;
+		char	   *sep = "";
+
+		Assert(prefix[xlrec->prefix_size] != '\0');
+
+		appendStringInfo(buf, "%s, prefix \"%s\"; payload (%zu bytes): ",
+						 xlrec->transactional ? "transactional" : "non-transactional",
+						 prefix, xlrec->message_size);
+		/* Write message payload as a series of hex bytes */
+		for (int cnt = 0; cnt < xlrec->message_size; cnt++)
+		{
+			appendStringInfo(buf, "%s%02X", sep, (unsigned char) message[cnt]);
+			sep = " ";
+		}
+	}
+}
+
+const char *
+logicalmsg_identify(uint8 info)
+{
+	if ((info & ~XLR_INFO_MASK) == XLOG_LOGICAL_MESSAGE)
+		return "MESSAGE";
+
+	return NULL;
+}