Print WAL logical message contents in pg_waldump
This helps debuggability when looking at WAL streams containing logical messages. Author: Ashutosh Bapat <ashutosh.bapat@2ndquadrant.com> Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org> Discussion: https://postgr.es/m/CAExHW5sWx49rKmXbg5H1Xc1t+nRv9PaYKQmgw82HPt6vWDVmDg@mail.gmail.com
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@ -24,10 +24,21 @@ logicalmsg_desc(StringInfo buf, XLogReaderState *record)
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if (info == XLOG_LOGICAL_MESSAGE)
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{
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xl_logical_message *xlrec = (xl_logical_message *) rec;
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char *prefix = xlrec->message;
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char *message = xlrec->message + xlrec->prefix_size;
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char *sep = "";
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appendStringInfo(buf, "%s message size %zu bytes",
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xlrec->transactional ? "transactional" : "nontransactional",
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xlrec->message_size);
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Assert(prefix[xlrec->prefix_size] != '\0');
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appendStringInfo(buf, "%s, prefix \"%s\"; payload (%zu bytes): ",
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xlrec->transactional ? "transactional" : "non-transactional",
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prefix, xlrec->message_size);
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/* Write message payload as a series of hex bytes */
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for (int cnt = 0; cnt < xlrec->message_size; cnt++)
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{
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appendStringInfo(buf, "%s%02X", sep, (unsigned char) message[cnt]);
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sep = " ";
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}
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}
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}
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@ -59,6 +59,7 @@ LogLogicalMessage(const char *prefix, const char *message, size_t size,
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xlrec.dbId = MyDatabaseId;
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xlrec.transactional = transactional;
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/* trailing zero is critical; see logicalmsg_desc */
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xlrec.prefix_size = strlen(prefix) + 1;
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xlrec.message_size = size;
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@ -23,9 +23,8 @@ typedef struct xl_logical_message
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bool transactional; /* is message transactional? */
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Size prefix_size; /* length of prefix */
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Size message_size; /* size of the message */
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char message[FLEXIBLE_ARRAY_MEMBER]; /* message including the null
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* terminated prefix of length
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* prefix_size */
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/* payload, including null-terminated prefix of length prefix_size */
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char message[FLEXIBLE_ARRAY_MEMBER];
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} xl_logical_message;
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#define SizeOfLogicalMessage (offsetof(xl_logical_message, message))
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