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Add decoding of sequences to built-in replication

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This commit adds support for decoding of sequences to the built-in
replication (the infrastructure was added by commit 0da92dc530).

The syntax and behavior mostly mimics handling of tables, i.e. a
publication may be defined as FOR ALL SEQUENCES (replicating all
sequences in a database), FOR ALL SEQUENCES IN SCHEMA (replicating
all sequences in a particular schema) or individual sequences.

To publish sequence modifications, the publication has to include
'sequence' action. The protocol is extended with a new message,
describing sequence increments.

A new system view pg_publication_sequences lists all the sequences
added to a publication, both directly and indirectly. Various psql
commands (\d and \dRp) are improved to also display publications
including a given sequence, or sequences included in a publication.

Author: Tomas Vondra, Cary Huang
Reviewed-by: Peter Eisentraut, Amit Kapila, Hannu Krosing, Andres
             Freund, Petr Jelinek
Discussion: https://postgr.es/m/d045f3c2-6cfb-06d3-5540-e63c320df8bc@enterprisedb.com
Discussion: https://postgr.es/m/1710ed7e13b.cd7177461430746.3372264562543607781@highgo.ca
This commit is contained in:
Tomas Vondra
2022-03-24 18:20:21 +01:00
parent 0adb3dc68b
commit 75b1521dae
40 changed files with 3236 additions and 469 deletions
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52
src/backend/replication/logical/proto.c
View File

@@ -648,6 +648,56 @@ logicalrep_write_message(StringInfo out, TransactionId xid, XLogRecPtr lsn,
pq_sendbytes(out, message, sz);
}
/*
* Write SEQUENCE to stream
*/
void
logicalrep_write_sequence(StringInfo out, Relation rel, TransactionId xid,
XLogRecPtr lsn, bool transactional,
int64 last_value, int64 log_cnt, bool is_called)
{
uint8 flags = 0;
char *relname;
pq_sendbyte(out, LOGICAL_REP_MSG_SEQUENCE);
/* transaction ID (if not valid, we're not streaming) */
if (TransactionIdIsValid(xid))
pq_sendint32(out, xid);
pq_sendint8(out, flags);
pq_sendint64(out, lsn);
logicalrep_write_namespace(out, RelationGetNamespace(rel));
relname = RelationGetRelationName(rel);
pq_sendstring(out, relname);
pq_sendint8(out, transactional);
pq_sendint64(out, last_value);
pq_sendint64(out, log_cnt);
pq_sendint8(out, is_called);
}
/*
* Read SEQUENCE from the stream.
*/
void
logicalrep_read_sequence(StringInfo in, LogicalRepSequence *seqdata)
{
/* XXX skipping flags and lsn */
pq_getmsgint(in, 1);
pq_getmsgint64(in);
/* Read relation name from stream */
seqdata->nspname = pstrdup(logicalrep_read_namespace(in));
seqdata->seqname = pstrdup(pq_getmsgstring(in));
seqdata->transactional = pq_getmsgint(in, 1);
seqdata->last_value = pq_getmsgint64(in);
seqdata->log_cnt = pq_getmsgint64(in);
seqdata->is_called = pq_getmsgint(in, 1);
}
/*
* Write relation description to the output stream.
*/
@@ -1203,6 +1253,8 @@ logicalrep_message_type(LogicalRepMsgType action)
return "STREAM ABORT";
case LOGICAL_REP_MSG_STREAM_PREPARE:
return "STREAM PREPARE";
case LOGICAL_REP_MSG_SEQUENCE:
return "SEQUENCE";
}
elog(ERROR, "invalid logical replication message type \"%c\"", action);