pg_dump: label PUBLICATION TABLE ArchiveEntries with an owner.

tglsfdc · tglsfdc · commit bb12a7f429ca · 2021-01-14T16:19:38.000-05:00
This is the same fix as commit 9eabfe3 applied to INDEX ATTACH entries, but for table-to-publication attachments. As in that case, even though the backend doesn't record "ownership" of the attachment, we still ought to label it in the dump archive with the role name that should run the ALTER PUBLICATION command. The existing behavior causes the ALTER to be done by the original role that started the restore; that will usually work fine, but there may be corner cases where it fails. The bulk of the patch is concerned with changing struct PublicationRelInfo to include a pointer to the associated PublicationInfo object, so that we can get the owner's name out of that when the time comes. While at it, I rewrote getPublicationTables() to do just one query of pg_publication_rel, not one per table. Back-patch to v10 where this code was introduced. Discussion: https://postgr.es/m/1165710.1610473242@sss.pgh.pa.us
diff --git a/src/bin/pg_dump/common.c b/src/bin/pg_dump/common.c
@@ -54,13 +54,15 @@ static DumpableObject **oprinfoindex;
 static DumpableObject **collinfoindex;
 static DumpableObject **nspinfoindex;
 static DumpableObject **extinfoindex;
+static DumpableObject **pubinfoindex;
 static int	numTables;
 static int	numTypes;
 static int	numFuncs;
 static int	numOperators;
 static int	numCollations;
 static int	numNamespaces;
 static int	numExtensions;
+static int	numPublications;
 
 /* This is an array of object identities, not actual DumpableObjects */
 static ExtensionMemberId *extmembers;
@@ -95,6 +97,7 @@ getSchemaData(Archive *fout, int *numTablesPtr)
 	CollInfo   *collinfo;
 	NamespaceInfo *nspinfo;
 	ExtensionInfo *extinfo;
+	PublicationInfo *pubinfo;
 	InhInfo    *inhinfo;
 	int			numAggregates;
 	int			numInherits;
@@ -286,7 +289,9 @@ getSchemaData(Archive *fout, int *numTablesPtr)
 
 	if (g_verbose)
 		write_msg(NULL, "reading publications\n");
-	getPublications(fout);
+	pubinfo = getPublications(fout, &numPublications);
+	pubinfoindex = buildIndexArray(pubinfo, numPublications,
+								   sizeof(PublicationInfo));
 
 	if (g_verbose)
 		write_msg(NULL, "reading publication membership\n");
@@ -935,6 +940,17 @@ findExtensionByOid(Oid oid)
 	return (ExtensionInfo *) findObjectByOid(oid, extinfoindex, numExtensions);
 }
 
+/*
+ * findPublicationByOid
+ *	  finds the entry (in pubinfo) of the publication with the given oid
+ *	  returns NULL if not found
+ */
+PublicationInfo *
+findPublicationByOid(Oid oid)
+{
+	return (PublicationInfo *) findObjectByOid(oid, pubinfoindex, numPublications);
+}
+
 /*
  * findIndexByOid
  *		find the entry of the index with the given oid
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
@@ -3742,8 +3742,8 @@ dumpPolicy(Archive *fout, PolicyInfo *polinfo)
  * getPublications
  *	  get information about publications
  */
-void
-getPublications(Archive *fout)
+PublicationInfo *
+getPublications(Archive *fout, int *numPublications)
 {
 	DumpOptions *dopt = fout->dopt;
 	PQExpBuffer query;
@@ -3762,7 +3762,10 @@ getPublications(Archive *fout)
 				ntups;
 
 	if (dopt->no_publications || fout->remoteVersion < 100000)
-		return;
+	{
+		*numPublications = 0;
+		return NULL;
+	}
 
 	query = createPQExpBuffer();
 
@@ -3830,6 +3833,9 @@ getPublications(Archive *fout)
 	PQclear(res);
 
 	destroyPQExpBuffer(query);
+
+	*numPublications = ntups;
+	return pubinfo;
 }
 
 /*
@@ -3935,7 +3941,8 @@ getPublicationTables(Archive *fout, TableInfo tblinfo[], int numTables)
 	DumpOptions *dopt = fout->dopt;
 	int			i_tableoid;
 	int			i_oid;
-	int			i_pubname;
+	int			i_prpubid;
+	int			i_prrelid;
 	int			i,
 				j,
 				ntups;
@@ -3945,12 +3952,39 @@ getPublicationTables(Archive *fout, TableInfo tblinfo[], int numTables)
 
 	query = createPQExpBuffer();
 
-	for (i = 0; i < numTables; i++)
+	/* Collect all publication membership info. */
+	appendPQExpBufferStr(query,
+						 "SELECT tableoid, oid, prpubid, prrelid "
+						 "FROM pg_catalog.pg_publication_rel");
+	res = ExecuteSqlQuery(fout, query->data, PGRES_TUPLES_OK);
+
+	ntups = PQntuples(res);
+
+	i_tableoid = PQfnumber(res, "tableoid");
+	i_oid = PQfnumber(res, "oid");
+	i_prpubid = PQfnumber(res, "prpubid");
+	i_prrelid = PQfnumber(res, "prrelid");
+
+	/* this allocation may be more than we need */
+	pubrinfo = pg_malloc(ntups * sizeof(PublicationRelInfo));
+	j = 0;
+
+	for (i = 0; i < ntups; i++)
 	{
-		TableInfo  *tbinfo = &tblinfo[i];
+		Oid			prpubid = atooid(PQgetvalue(res, i, i_prpubid));
+		Oid			prrelid = atooid(PQgetvalue(res, i, i_prrelid));
+		PublicationInfo *pubinfo;
+		TableInfo  *tbinfo;
 
-		/* Only plain tables can be aded to publications. */
-		if (tbinfo->relkind != RELKIND_RELATION)
+		/*
+		 * Ignore any entries for which we aren't interested in either the
+		 * publication or the rel.
+		 */
+		pubinfo = findPublicationByOid(prpubid);
+		if (pubinfo == NULL)
+			continue;
+		tbinfo = findTableByOid(prrelid);
+		if (tbinfo == NULL)
 			continue;
 
 		/*
@@ -3960,56 +3994,24 @@ getPublicationTables(Archive *fout, TableInfo tblinfo[], int numTables)
 		if (!(tbinfo->dobj.dump & DUMP_COMPONENT_DEFINITION))
 			continue;
 
-		if (g_verbose)
-			write_msg(NULL, "reading publication membership for table \"%s.%s\"\n",
-					  tbinfo->dobj.namespace->dobj.name,
-					  tbinfo->dobj.name);
-
-		resetPQExpBuffer(query);
-
-		/* Get the publication membership for the table. */
-		appendPQExpBuffer(query,
-						  "SELECT pr.tableoid, pr.oid, p.pubname "
-						  "FROM pg_publication_rel pr, pg_publication p "
-						  "WHERE pr.prrelid = '%u'"
-						  "  AND p.oid = pr.prpubid",
-						  tbinfo->dobj.catId.oid);
-		res = ExecuteSqlQuery(fout, query->data, PGRES_TUPLES_OK);
-
-		ntups = PQntuples(res);
-
-		if (ntups == 0)
-		{
-			/*
-			 * Table is not member of any publications. Clean up and return.
-			 */
-			PQclear(res);
-			continue;
-		}
-
-		i_tableoid = PQfnumber(res, "tableoid");
-		i_oid = PQfnumber(res, "oid");
-		i_pubname = PQfnumber(res, "pubname");
+		/* OK, make a DumpableObject for this relationship */
+		pubrinfo[j].dobj.objType = DO_PUBLICATION_REL;
+		pubrinfo[j].dobj.catId.tableoid =
+			atooid(PQgetvalue(res, i, i_tableoid));
+		pubrinfo[j].dobj.catId.oid = atooid(PQgetvalue(res, i, i_oid));
+		AssignDumpId(&pubrinfo[j].dobj);
+		pubrinfo[j].dobj.namespace = tbinfo->dobj.namespace;
+		pubrinfo[j].dobj.name = tbinfo->dobj.name;
+		pubrinfo[j].publication = pubinfo;
+		pubrinfo[j].pubtable = tbinfo;
 
-		pubrinfo = pg_malloc(ntups * sizeof(PublicationRelInfo));
+		/* Decide whether we want to dump it */
+		selectDumpablePublicationTable(&(pubrinfo[j].dobj), fout);
 
-		for (j = 0; j < ntups; j++)
-		{
-			pubrinfo[j].dobj.objType = DO_PUBLICATION_REL;
-			pubrinfo[j].dobj.catId.tableoid =
-				atooid(PQgetvalue(res, j, i_tableoid));
-			pubrinfo[j].dobj.catId.oid = atooid(PQgetvalue(res, j, i_oid));
-			AssignDumpId(&pubrinfo[j].dobj);
-			pubrinfo[j].dobj.namespace = tbinfo->dobj.namespace;
-			pubrinfo[j].dobj.name = tbinfo->dobj.name;
-			pubrinfo[j].pubname = pg_strdup(PQgetvalue(res, j, i_pubname));
-			pubrinfo[j].pubtable = tbinfo;
-
-			/* Decide whether we want to dump it */
-			selectDumpablePublicationTable(&(pubrinfo[j].dobj), fout);
-		}
-		PQclear(res);
+		j++;
 	}
+
+	PQclear(res);
 	destroyPQExpBuffer(query);
 }
 
@@ -4020,31 +4022,35 @@ getPublicationTables(Archive *fout, TableInfo tblinfo[], int numTables)
 static void
 dumpPublicationTable(Archive *fout, PublicationRelInfo *pubrinfo)
 {
+	PublicationInfo *pubinfo = pubrinfo->publication;
 	TableInfo  *tbinfo = pubrinfo->pubtable;
 	PQExpBuffer query;
 	char	   *tag;
 
 	if (!(pubrinfo->dobj.dump & DUMP_COMPONENT_DEFINITION))
 		return;
 
-	tag = psprintf("%s %s", pubrinfo->pubname, tbinfo->dobj.name);
+	tag = psprintf("%s %s", pubinfo->dobj.name, tbinfo->dobj.name);
 
 	query = createPQExpBuffer();
 
 	appendPQExpBuffer(query, "ALTER PUBLICATION %s ADD TABLE ONLY",
-					  fmtId(pubrinfo->pubname));
+					  fmtId(pubinfo->dobj.name));
 	appendPQExpBuffer(query, " %s;\n",
 					  fmtQualifiedDumpable(tbinfo));
 
 	/*
-	 * There is no point in creating drop query as drop query as the drop is
-	 * done by table drop.
+	 * There is no point in creating a drop query as the drop is done by table
+	 * drop.  (If you think to change this, see also _printTocEntry().)
+	 * Although this object doesn't really have ownership as such, set the
+	 * owner field anyway to ensure that the command is run by the correct
+	 * role at restore time.
 	 */
 	ArchiveEntry(fout, pubrinfo->dobj.catId, pubrinfo->dobj.dumpId,
 				 tag,
 				 tbinfo->dobj.namespace->dobj.name,
 				 NULL,
-				 "", false,
+				 pubinfo->rolname, false,
 				 "PUBLICATION TABLE", SECTION_POST_DATA,
 				 query->data, "", NULL,
 				 NULL, 0,
diff --git a/src/bin/pg_dump/pg_dump.h b/src/bin/pg_dump/pg_dump.h
@@ -611,8 +611,8 @@ typedef struct _PublicationInfo
 typedef struct _PublicationRelInfo
 {
 	DumpableObject dobj;
+	PublicationInfo *publication;
 	TableInfo  *pubtable;
-	char	   *pubname;
 } PublicationRelInfo;
 
 /*
@@ -671,6 +671,7 @@ extern OprInfo *findOprByOid(Oid oid);
 extern CollInfo *findCollationByOid(Oid oid);
 extern NamespaceInfo *findNamespaceByOid(Oid oid);
 extern ExtensionInfo *findExtensionByOid(Oid oid);
+extern PublicationInfo *findPublicationByOid(Oid oid);
 
 extern void setExtensionMembership(ExtensionMemberId *extmems, int nextmems);
 extern ExtensionInfo *findOwningExtension(CatalogId catalogId);
@@ -724,7 +725,8 @@ extern void processExtensionTables(Archive *fout, ExtensionInfo extinfo[],
 					   int numExtensions);
 extern EventTriggerInfo *getEventTriggers(Archive *fout, int *numEventTriggers);
 extern void getPolicies(Archive *fout, TableInfo tblinfo[], int numTables);
-extern void getPublications(Archive *fout);
+extern PublicationInfo *getPublications(Archive *fout,
+										int *numPublications);
 extern void getPublicationTables(Archive *fout, TableInfo tblinfo[],
 					 int numTables);
 extern void getSubscriptions(Archive *fout);
