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pg_basebackup: Add option to create replication slot

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When requesting a particular replication slot, the new pg_basebackup
option -C/--create-slot creates it before starting to replicate from it.

Further refactor the slot creation logic to include the temporary slot
creation logic into the same function.  Add new arguments is_temporary
and preserve_wal to CreateReplicationSlot().  Print in --verbose mode
that a slot has been created.

Author: Michael Banck <michael.banck@credativ.de>
This commit is contained in:
Peter Eisentraut
2017-09-26 16:07:52 -04:00
parent 59597e6485
commit 3709ca1cf0
9 changed files with 112 additions and 41 deletions
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16
src/bin/pg_basebackup/streamutil.c
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@@ -398,7 +398,8 @@ RunIdentifySystem(PGconn *conn, char **sysid, TimeLineID *starttli,
*/
bool
CreateReplicationSlot(PGconn *conn, const char *slot_name, const char *plugin,
bool is_physical, bool slot_exists_ok)
bool is_temporary, bool is_physical, bool reserve_wal,
bool slot_exists_ok)
{
PQExpBuffer query;
PGresult *res;
@@ -410,13 +411,18 @@ CreateReplicationSlot(PGconn *conn, const char *slot_name, const char *plugin,
Assert(slot_name != NULL);
/* Build query */
appendPQExpBuffer(query, "CREATE_REPLICATION_SLOT \"%s\"", slot_name);
if (is_temporary)
appendPQExpBuffer(query, " TEMPORARY");
if (is_physical)
appendPQExpBuffer(query, "CREATE_REPLICATION_SLOT \"%s\" PHYSICAL",
slot_name);
{
appendPQExpBuffer(query, " PHYSICAL");
if (reserve_wal)
appendPQExpBuffer(query, " RESERVE_WAL");
}
else
{
appendPQExpBuffer(query, "CREATE_REPLICATION_SLOT \"%s\" LOGICAL \"%s\"",
slot_name, plugin);
appendPQExpBuffer(query, " LOGICAL \"%s\"", plugin);
if (PQserverVersion(conn) >= 100000)
/* pg_recvlogical doesn't use an exported snapshot, so suppress */
appendPQExpBuffer(query, " NOEXPORT_SNAPSHOT");