pg_dump: label PUBLICATION TABLE ArchiveEntries with an owner.

This is the same fix as commit 9eabfe300 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
index 255f891432631b5c1619c5df432cf2e6696967ff..b0f02bc1f6e51d829484d8b6f17cd129d6f2e687 100644 (file)
--- a/src/bin/pg_dump/common.c
+++ b/src/bin/pg_dump/common.c
@@ -52,6 +52,7 @@ static DumpableObject **oprinfoindex;
 static DumpableObject **collinfoindex;
 static DumpableObject **nspinfoindex;
 static DumpableObject **extinfoindex;
+static DumpableObject **pubinfoindex;
 static int     numTables;
 static int     numTypes;
 static int     numFuncs;
@@ -59,6 +60,7 @@ 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;
@@ -93,6 +95,7 @@ getSchemaData(Archive *fout, int *numTablesPtr)
        CollInfo   *collinfo;
        NamespaceInfo *nspinfo;
        ExtensionInfo *extinfo;
+       PublicationInfo *pubinfo;
        InhInfo    *inhinfo;
        int                     numAggregates;
        int                     numInherits;
@@ -247,7 +250,9 @@ getSchemaData(Archive *fout, int *numTablesPtr)
        getPolicies(fout, tblinfo, numTables);
 
        pg_log_info("reading publications");
-       getPublications(fout);
+       pubinfo = getPublications(fout, &numPublications);
+       pubinfoindex = buildIndexArray(pubinfo, numPublications,
+                                                                  sizeof(PublicationInfo));
 
        pg_log_info("reading publication membership");
        getPublicationTables(fout, tblinfo, numTables);
@@ -937,6 +942,17 @@ 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
index 3bcbd4bdc3f60cb3b1b934c74864cb378696125b..798d14580e6d1b63878e797389863c25f42bf788 100644 (file)
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -3865,8 +3865,8 @@ 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;
@@ -3886,7 +3886,10 @@ getPublications(Archive *fout)
                                ntups;
 
        if (dopt->no_publications || fout->remoteVersion < 100000)
-               return;
+       {
+               *numPublications = 0;
+               return NULL;
+       }
 
        query = createPQExpBuffer();
 
@@ -3964,6 +3967,9 @@ getPublications(Archive *fout)
        PQclear(res);
 
        destroyPQExpBuffer(query);
+
+       *numPublications = ntups;
+       return pubinfo;
 }
 
 /*
@@ -4072,7 +4078,8 @@ 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;
@@ -4082,15 +4089,39 @@ 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 regular and partitioned tables can be added to publications.
+                * Ignore any entries for which we aren't interested in either the
+                * publication or the rel.
                 */
-               if (tbinfo->relkind != RELKIND_RELATION &&
-                       tbinfo->relkind != RELKIND_PARTITIONED_TABLE)
+               pubinfo = findPublicationByOid(prpubid);
+               if (pubinfo == NULL)
+                       continue;
+               tbinfo = findTableByOid(prrelid);
+               if (tbinfo == NULL)
                        continue;
 
                /*
@@ -4100,55 +4131,24 @@ getPublicationTables(Archive *fout, TableInfo tblinfo[], int numTables)
                if (!(tbinfo->dobj.dump & DUMP_COMPONENT_DEFINITION))
                        continue;
 
-               pg_log_info("reading publication membership for table \"%s.%s\"",
-                                       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);
 }
 
@@ -4159,6 +4159,7 @@ 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;
@@ -4166,22 +4167,26 @@ dumpPublicationTable(Archive *fout, PublicationRelInfo *pubrinfo)
        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 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,
                                 ARCHIVE_OPTS(.tag = tag,
                                                          .namespace = tbinfo->dobj.namespace->dobj.name,
+                                                         .owner = pubinfo->rolname,
                                                          .description = "PUBLICATION TABLE",
                                                          .section = SECTION_POST_DATA,
                                                          .createStmt = query->data));

diff --git a/src/bin/pg_dump/pg_dump.h b/src/bin/pg_dump/pg_dump.h
index 731d0fe7ba849a96fbdc5e37ed7fd1f9a63cb98d..1290f9659b853e7c61e5bc9b2db89ecc857a3948 100644 (file)
--- a/src/bin/pg_dump/pg_dump.h
+++ b/src/bin/pg_dump/pg_dump.h
@@ -623,8 +623,8 @@ typedef struct _PublicationInfo
 typedef struct _PublicationRelInfo
 {
        DumpableObject dobj;
+       PublicationInfo *publication;
        TableInfo  *pubtable;
-       char       *pubname;
 } PublicationRelInfo;
 
 /*
@@ -675,6 +675,7 @@ 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);
@@ -727,7 +728,8 @@ 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);