logicalmsgdesc.c

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/*-------------------------------------------------------------------------
 *
 * logicalmsgdesc.c
 *    rmgr descriptor routines for replication/logical/message.c
 *
 * Portions Copyright (c) 2015-2025, 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 - 1] == '\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;
}