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Enhance libpqrcv APIs to support slot synchronization.

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This patch provides support for regular (non-replication) connections in
libpqrcv_connect(). This can be used to execute SQL statements on the
primary server without starting a walsender.

A new API libpqrcv_get_dbname_from_conninfo() is also added to extract the
database name from the given connection-info.

Note that this patch doesn't change any existing functionality but later
patches implementing the slot synchronization will use this functionality
to connect to the primary server to fetch required slot information.

Author: Shveta Malik, Hou Zhijie, Ajin Cherian
Reviewed-by: Peter Smith, Bertrand Drouvot, Dilip Kumar, Masahiko Sawada, Nisha Moond, Kuroda Hayato, Amit Kapila
Discussion: https://postgr.es/m/514f6f2f-6833-4539-39f1-96cd1e011f23@enterprisedb.com
This commit is contained in:
Amit Kapila
2024-02-05 10:45:34 +05:30
parent a17aa50d67
commit dafbfed9ef
6 changed files with 114 additions and 40 deletions
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8
src/backend/commands/subscriptioncmds.c
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@@ -759,7 +759,7 @@ CreateSubscription(ParseState *pstate, CreateSubscriptionStmt *stmt,
/* Try to connect to the publisher. */
must_use_password = !superuser_arg(owner) && opts.passwordrequired;
wrconn = walrcv_connect(conninfo, true, must_use_password,
wrconn = walrcv_connect(conninfo, true, true, must_use_password,
stmt->subname, &err);
if (!wrconn)
ereport(ERROR,
@@ -910,7 +910,7 @@ AlterSubscription_refresh(Subscription *sub, bool copy_data,
/* Try to connect to the publisher. */
must_use_password = sub->passwordrequired && !sub->ownersuperuser;
wrconn = walrcv_connect(sub->conninfo, true, must_use_password,
wrconn = walrcv_connect(sub->conninfo, true, true, must_use_password,
sub->name, &err);
if (!wrconn)
ereport(ERROR,
@@ -1537,7 +1537,7 @@ AlterSubscription(ParseState *pstate, AlterSubscriptionStmt *stmt,
/* Try to connect to the publisher. */
must_use_password = sub->passwordrequired && !sub->ownersuperuser;
wrconn = walrcv_connect(sub->conninfo, true, must_use_password,
wrconn = walrcv_connect(sub->conninfo, true, true, must_use_password,
sub->name, &err);
if (!wrconn)
ereport(ERROR,
@@ -1788,7 +1788,7 @@ DropSubscription(DropSubscriptionStmt *stmt, bool isTopLevel)
*/
load_file("libpqwalreceiver", false);
wrconn = walrcv_connect(conninfo, true, must_use_password,
wrconn = walrcv_connect(conninfo, true, true, must_use_password,
subname, &err);
if (wrconn == NULL)
{