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Raise a WARNING for missing publications.

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When we create or alter a subscription to add publications raise a warning
for non-existent publications. We don't want to give an error here because
it is possible that users can later create the missing publications.

Author: Vignesh C
Reviewed-by: Bharath Rupireddy, Japin Li, Dilip Kumar, Euler Taveira, Ashutosh Sharma, Amit Kapila
Discussion: https://postgr.es/m/CALDaNm0f4YujGW+q-Di0CbZpnQKFFrXntikaQQKuEmGG0=Zw=Q@mail.gmail.com
This commit is contained in:
Amit Kapila
2022-03-31 08:24:19 +05:30
parent 8ac4c25a05
commit 8f2e2bbf14
4 changed files with 160 additions and 21 deletions
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133
src/backend/commands/subscriptioncmds.c
View File

@@ -375,6 +375,103 @@ parse_subscription_options(ParseState *pstate, List *stmt_options,
}
}
/*
* Add publication names from the list to a string.
*/
static void
get_publications_str(List *publications, StringInfo dest, bool quote_literal)
{
ListCell *lc;
bool first = true;
Assert(list_length(publications) > 0);
foreach(lc, publications)
{
char *pubname = strVal(lfirst(lc));
if (first)
first = false;
else
appendStringInfoString(dest, ", ");
if (quote_literal)
appendStringInfoString(dest, quote_literal_cstr(pubname));
else
{
appendStringInfoChar(dest, '"');
appendStringInfoString(dest, pubname);
appendStringInfoChar(dest, '"');
}
}
}
/*
* Check the specified publication(s) is(are) present in the publisher.
*/
static void
check_publications(WalReceiverConn *wrconn, List *publications)
{
WalRcvExecResult *res;
StringInfo cmd;
TupleTableSlot *slot;
List *publicationsCopy = NIL;
Oid tableRow[1] = {TEXTOID};
cmd = makeStringInfo();
appendStringInfoString(cmd, "SELECT t.pubname FROM\n"
" pg_catalog.pg_publication t WHERE\n"
" t.pubname IN (");
get_publications_str(publications, cmd, true);
appendStringInfoChar(cmd, ')');
res = walrcv_exec(wrconn, cmd->data, 1, tableRow);
pfree(cmd->data);
pfree(cmd);
if (res->status != WALRCV_OK_TUPLES)
ereport(ERROR,
errmsg_plural("could not receive publication from the publisher: %s",
"could not receive list of publications from the publisher: %s",
list_length(publications),
res->err));
publicationsCopy = list_copy(publications);
/* Process publication(s). */
slot = MakeSingleTupleTableSlot(res->tupledesc, &TTSOpsMinimalTuple);
while (tuplestore_gettupleslot(res->tuplestore, true, false, slot))
{
char *pubname;
bool isnull;
pubname = TextDatumGetCString(slot_getattr(slot, 1, &isnull));
Assert(!isnull);
/* Delete the publication present in publisher from the list. */
publicationsCopy = list_delete(publicationsCopy, makeString(pubname));
ExecClearTuple(slot);
}
ExecDropSingleTupleTableSlot(slot);
walrcv_clear_result(res);
if (list_length(publicationsCopy))
{
/* Prepare the list of non-existent publication(s) for error message. */
StringInfo pubnames = makeStringInfo();
get_publications_str(publicationsCopy, pubnames, false);
ereport(WARNING,
errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg_plural("publication %s does not exist in the publisher",
"publications %s do not exist in the publisher",
list_length(publicationsCopy),
pubnames->data));
}
}
/*
* Auxiliary function to build a text array out of a list of String nodes.
*/
@@ -555,6 +652,8 @@ CreateSubscription(ParseState *pstate, CreateSubscriptionStmt *stmt,
PG_TRY();
{
check_publications(wrconn, publications);
/*
* Set sync state based on if we were asked to do data copy or
* not.
@@ -650,7 +749,8 @@ CreateSubscription(ParseState *pstate, CreateSubscriptionStmt *stmt,
}
static void
AlterSubscription_refresh(Subscription *sub, bool copy_data)
AlterSubscription_refresh(Subscription *sub, bool copy_data,
List *validate_publications)
{
char *err;
List *pubrel_names;
@@ -681,6 +781,9 @@ AlterSubscription_refresh(Subscription *sub, bool copy_data)
PG_TRY();
{
if (validate_publications)
check_publications(wrconn, validate_publications);
/* Get the list of relations from publisher. */
pubrel_names = fetch_table_list(wrconn, sub->publications);
pubrel_names = list_concat(pubrel_names,
@@ -1048,7 +1151,8 @@ AlterSubscription(ParseState *pstate, AlterSubscriptionStmt *stmt,
/* Make sure refresh sees the new list of publications. */
sub->publications = stmt->publication;
AlterSubscription_refresh(sub, opts.copy_data);
AlterSubscription_refresh(sub, opts.copy_data,
stmt->publication);
}
break;
@@ -1074,6 +1178,9 @@ AlterSubscription(ParseState *pstate, AlterSubscriptionStmt *stmt,
/* Refresh if user asked us to. */
if (opts.refresh)
{
/* We only need to validate user specified publications. */
List *validate_publications = (isadd) ? stmt->publication : NULL;
if (!sub->enabled)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
@@ -1096,7 +1203,8 @@ AlterSubscription(ParseState *pstate, AlterSubscriptionStmt *stmt,
/* Refresh the new list of publications. */
sub->publications = publist;
AlterSubscription_refresh(sub, opts.copy_data);
AlterSubscription_refresh(sub, opts.copy_data,
validate_publications);
}
break;
@@ -1138,7 +1246,7 @@ AlterSubscription(ParseState *pstate, AlterSubscriptionStmt *stmt,
PreventInTransactionBlock(isTopLevel, "ALTER SUBSCRIPTION ... REFRESH");
AlterSubscription_refresh(sub, opts.copy_data);
AlterSubscription_refresh(sub, opts.copy_data, NULL);
break;
}
@@ -1659,28 +1767,13 @@ fetch_table_list(WalReceiverConn *wrconn, List *publications)
StringInfoData cmd;
TupleTableSlot *slot;
Oid tableRow[2] = {TEXTOID, TEXTOID};
ListCell *lc;
bool first;
List *tablelist = NIL;
Assert(list_length(publications) > 0);
initStringInfo(&cmd);
appendStringInfoString(&cmd, "SELECT DISTINCT t.schemaname, t.tablename\n"
" FROM pg_catalog.pg_publication_tables t\n"
" WHERE t.pubname IN (");
first = true;
foreach(lc, publications)
{
char *pubname = strVal(lfirst(lc));
if (first)
first = false;
else
appendStringInfoString(&cmd, ", ");
appendStringInfoString(&cmd, quote_literal_cstr(pubname));
}
get_publications_str(publications, &cmd, true);
appendStringInfoChar(&cmd, ')');
res = walrcv_exec(wrconn, cmd.data, 2, tableRow);