Move common catalog cache access routines to lsyscache.c

In passing, move pg_relation_is_publishable next to similar functions.

Suggested-by: Alvaro Herrera
Author: Amit Kapila
Reviewed-by: Hou Zhijie
Discussion: https://postgr.es/m/CAHut+PupQ5UW9A9ut0Yjt21J9tHhx958z5L0k8-9hTYf_NYqxA@mail.gmail.com

Author: Amit Kapila

src/backend/catalog/pg_publication.c

@@ -149,6 +149,28 @@ is_publishable_relation(Relation rel)
 	return is_publishable_class(RelationGetRelid(rel), rel->rd_rel);
 }
 
+/*
+ * SQL-callable variant of the above
+ *
+ * This returns null when the relation does not exist.  This is intended to be
+ * used for example in psql to avoid gratuitous errors when there are
+ * concurrent catalog changes.
+ */
+Datum
+pg_relation_is_publishable(PG_FUNCTION_ARGS)
+{
+	Oid			relid = PG_GETARG_OID(0);
+	HeapTuple	tuple;
+	bool		result;
+
+	tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
+	if (!HeapTupleIsValid(tuple))
+		PG_RETURN_NULL();
+	result = is_publishable_class(relid, (Form_pg_class) GETSTRUCT(tuple));
+	ReleaseSysCache(tuple);
+	PG_RETURN_BOOL(result);
+}
+
 /*
  * Filter out the partitions whose parent tables were also specified in
  * the publication.
@@ -219,28 +241,6 @@ is_schema_publication(Oid pubid)
 	return result;
 }
 
-/*
- * SQL-callable variant of the above
- *
- * This returns null when the relation does not exist.  This is intended to be
- * used for example in psql to avoid gratuitous errors when there are
- * concurrent catalog changes.
- */
-Datum
-pg_relation_is_publishable(PG_FUNCTION_ARGS)
-{
-	Oid			relid = PG_GETARG_OID(0);
-	HeapTuple	tuple;
-	bool		result;
-
-	tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
-	if (!HeapTupleIsValid(tuple))
-		PG_RETURN_NULL();
-	result = is_publishable_class(relid, (Form_pg_class) GETSTRUCT(tuple));
-	ReleaseSysCache(tuple);
-	PG_RETURN_BOOL(result);
-}
-
 /*
  * Gets the relations based on the publication partition option for a specified
  * relation.
@@ -1012,7 +1012,6 @@ GetPublication(Oid pubid)
 	return pub;
 }
 
-
 /*
  * Get Publication using name.
  */
@@ -1026,56 +1025,6 @@ GetPublicationByName(const char *pubname, bool missing_ok)
 	return OidIsValid(oid) ? GetPublication(oid) : NULL;
 }
 
-/*
- * get_publication_oid - given a publication name, look up the OID
- *
- * If missing_ok is false, throw an error if name not found.  If true, just
- * return InvalidOid.
- */
-Oid
-get_publication_oid(const char *pubname, bool missing_ok)
-{
-	Oid			oid;
-
-	oid = GetSysCacheOid1(PUBLICATIONNAME, Anum_pg_publication_oid,
-						  CStringGetDatum(pubname));
-	if (!OidIsValid(oid) && !missing_ok)
-		ereport(ERROR,
-				(errcode(ERRCODE_UNDEFINED_OBJECT),
-				 errmsg("publication \"%s\" does not exist", pubname)));
-	return oid;
-}
-
-/*
- * get_publication_name - given a publication Oid, look up the name
- *
- * If missing_ok is false, throw an error if name not found.  If true, just
- * return NULL.
- */
-char *
-get_publication_name(Oid pubid, bool missing_ok)
-{
-	HeapTuple	tup;
-	char	   *pubname;
-	Form_pg_publication pubform;
-
-	tup = SearchSysCache1(PUBLICATIONOID, ObjectIdGetDatum(pubid));
-
-	if (!HeapTupleIsValid(tup))
-	{
-		if (!missing_ok)
-			elog(ERROR, "cache lookup failed for publication %u", pubid);
-		return NULL;
-	}
-
-	pubform = (Form_pg_publication) GETSTRUCT(tup);
-	pubname = pstrdup(NameStr(pubform->pubname));
-
-	ReleaseSysCache(tup);
-
-	return pubname;
-}
-
 /*
  * Returns information of tables in a publication.
  */

src/backend/catalog/pg_subscription.c

@@ -205,56 +205,6 @@ DisableSubscription(Oid subid)
 	table_close(rel, NoLock);
 }
 
-/*
- * get_subscription_oid - given a subscription name, look up the OID
- *
- * If missing_ok is false, throw an error if name not found.  If true, just
- * return InvalidOid.
- */
-Oid
-get_subscription_oid(const char *subname, bool missing_ok)
-{
-	Oid			oid;
-
-	oid = GetSysCacheOid2(SUBSCRIPTIONNAME, Anum_pg_subscription_oid,
-						  MyDatabaseId, CStringGetDatum(subname));
-	if (!OidIsValid(oid) && !missing_ok)
-		ereport(ERROR,
-				(errcode(ERRCODE_UNDEFINED_OBJECT),
-				 errmsg("subscription \"%s\" does not exist", subname)));
-	return oid;
-}
-
-/*
- * get_subscription_name - given a subscription OID, look up the name
- *
- * If missing_ok is false, throw an error if name not found.  If true, just
- * return NULL.
- */
-char *
-get_subscription_name(Oid subid, bool missing_ok)
-{
-	HeapTuple	tup;
-	char	   *subname;
-	Form_pg_subscription subform;
-
-	tup = SearchSysCache1(SUBSCRIPTIONOID, ObjectIdGetDatum(subid));
-
-	if (!HeapTupleIsValid(tup))
-	{
-		if (!missing_ok)
-			elog(ERROR, "cache lookup failed for subscription %u", subid);
-		return NULL;
-	}
-
-	subform = (Form_pg_subscription) GETSTRUCT(tup);
-	subname = pstrdup(NameStr(subform->subname));
-
-	ReleaseSysCache(tup);
-
-	return subname;
-}
-
 /*
  * Convert text array to list of strings.
  *

src/backend/utils/cache/lsyscache.c

@@ -33,6 +33,7 @@
 #include "catalog/pg_proc.h"
 #include "catalog/pg_range.h"
 #include "catalog/pg_statistic.h"
+#include "catalog/pg_subscription.h"
 #include "catalog/pg_transform.h"
 #include "catalog/pg_type.h"
 #include "miscadmin.h"
@@ -3578,3 +3579,103 @@ get_index_isclustered(Oid index_oid)
 
 	return isclustered;
 }
+
+/*
+ * get_publication_oid - given a publication name, look up the OID
+ *
+ * If missing_ok is false, throw an error if name not found.  If true, just
+ * return InvalidOid.
+ */
+Oid
+get_publication_oid(const char *pubname, bool missing_ok)
+{
+	Oid			oid;
+
+	oid = GetSysCacheOid1(PUBLICATIONNAME, Anum_pg_publication_oid,
+						  CStringGetDatum(pubname));
+	if (!OidIsValid(oid) && !missing_ok)
+		ereport(ERROR,
+				(errcode(ERRCODE_UNDEFINED_OBJECT),
+				 errmsg("publication \"%s\" does not exist", pubname)));
+	return oid;
+}
+
+/*
+ * get_publication_name - given a publication Oid, look up the name
+ *
+ * If missing_ok is false, throw an error if name not found.  If true, just
+ * return NULL.
+ */
+char *
+get_publication_name(Oid pubid, bool missing_ok)
+{
+	HeapTuple	tup;
+	char	*pubname;
+	Form_pg_publication pubform;
+
+	tup = SearchSysCache1(PUBLICATIONOID, ObjectIdGetDatum(pubid));
+
+	if (!HeapTupleIsValid(tup))
+	{
+		if (!missing_ok)
+			elog(ERROR, "cache lookup failed for publication %u", pubid);
+		return NULL;
+	}
+
+	pubform = (Form_pg_publication) GETSTRUCT(tup);
+	pubname = pstrdup(NameStr(pubform->pubname));
+
+	ReleaseSysCache(tup);
+
+	return pubname;
+}
+
+/*
+ * get_subscription_oid - given a subscription name, look up the OID
+ *
+ * If missing_ok is false, throw an error if name not found.  If true, just
+ * return InvalidOid.
+ */
+Oid
+get_subscription_oid(const char* subname, bool missing_ok)
+{
+	Oid			oid;
+
+	oid = GetSysCacheOid2(SUBSCRIPTIONNAME, Anum_pg_subscription_oid,
+						   MyDatabaseId, CStringGetDatum(subname));
+	if (!OidIsValid(oid) && !missing_ok)
+		ereport(ERROR,
+			(errcode(ERRCODE_UNDEFINED_OBJECT),
+			 errmsg("subscription \"%s\" does not exist", subname)));
+	return oid;
+}
+
+/*
+ * get_subscription_name - given a subscription OID, look up the name
+ *
+ * If missing_ok is false, throw an error if name not found.  If true, just
+ * return NULL.
+ */
+char *
+get_subscription_name(Oid subid, bool missing_ok)
+{
+	HeapTuple	tup;
+	char* subname;
+	Form_pg_subscription subform;
+
+	tup = SearchSysCache1(SUBSCRIPTIONOID, ObjectIdGetDatum(subid));
+
+	if (!HeapTupleIsValid(tup))
+	{
+		if (!missing_ok)
+			elog(ERROR, "cache lookup failed for subscription %u", subid);
+		return NULL;
+	}
+
+	subform = (Form_pg_subscription) GETSTRUCT(tup);
+	subname = pstrdup(NameStr(subform->subname));
+
+	ReleaseSysCache(tup);
+
+	return subname;
+}

src/include/catalog/pg_publication.h

@@ -155,7 +155,4 @@ extern ObjectAddress publication_add_schema(Oid pubid, Oid schemaid,
 extern Bitmapset *pub_collist_to_bitmapset(Bitmapset *columns, Datum pubcols,
 										   MemoryContext mcxt);
 
-extern Oid	get_publication_oid(const char *pubname, bool missing_ok);
-extern char *get_publication_name(Oid pubid, bool missing_ok);
-
 #endif							/* PG_PUBLICATION_H */

src/include/catalog/pg_subscription.h

@@ -140,8 +140,6 @@ typedef struct Subscription
 extern Subscription *GetSubscription(Oid subid, bool missing_ok);
 extern void FreeSubscription(Subscription *sub);
 extern void DisableSubscription(Oid subid);
-extern Oid	get_subscription_oid(const char *subname, bool missing_ok);
-extern char *get_subscription_name(Oid subid, bool missing_ok);
 
 extern int	CountDBSubscriptions(Oid dbid);
 

src/include/utils/lsyscache.h

@@ -198,6 +198,10 @@ extern Oid	get_index_column_opclass(Oid index_oid, int attno);
 extern bool get_index_isreplident(Oid index_oid);
 extern bool get_index_isvalid(Oid index_oid);
 extern bool get_index_isclustered(Oid index_oid);
+extern Oid	get_publication_oid(const char *pubname, bool missing_ok);
+extern char *get_publication_name(Oid pubid, bool missing_ok);
+extern Oid	get_subscription_oid(const char *subname, bool missing_ok);
+extern char *get_subscription_name(Oid subid, bool missing_ok);
 
 #define type_is_array(typid)  (get_element_type(typid) != InvalidOid)
 /* type_is_array_domain accepts both plain arrays and domains over arrays */