ovsdb-idl: Add the support to specify the uuid for row insert.

ovsdb-server allows the OVSDB clients to specify the uuid for
the row inserts [1].  Both the C IDL client library and Python
IDL are missing this feature.  This patch adds this support.

In C IDL, for each schema table, a new function is generated -
<schema_table>insert_persistent_uuid(txn, uuid) which can
be used the clients to persist the uuid.

ovs-vsctl and other derivatives of ctl now supports the same
in the generic 'create' command with the option "--id=<UUID>".

In Python IDL, the uuid to persist can be specified in
the Transaction.insert() function.

[1] - a529e3cd1f("ovsdb-server: Allow OVSDB clients to specify the UUID for inserted rows.:)

Acked-by: Adrian Moreno <amorenoz@redhat.com>
Acked-by: Han Zhou <hzhou@ovn.org>
Acked-by: Terry Wilson <twilson@redhat.com>
Signed-off-by: Numan Siddique <numans@ovn.org>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

NEWS

@@ -3,6 +3,9 @@ Post-v3.0.0
    - ovs-appctl:
      * "ovs-appctl ofproto/trace" command can now display port names with the
        "--names" option.
+   - OVSDB-IDL:
+     * Add the support to specify the persistent uuid for row insert in both
+       C and Python IDLs.
    - Windows:
      * Conntrack IPv6 fragment support.
    - DPDK:

lib/db-ctl-base.c

@@ -1731,29 +1731,43 @@ cmd_create(struct ctl_context *ctx)
     const struct ovsdb_idl_table_class *table;
     const struct ovsdb_idl_row *row;
     const struct uuid *uuid = NULL;
+    bool persist_uuid = false;
+    struct uuid uuid_;
     int i;
 
     ctx->error = get_table(table_name, &table);
     if (ctx->error) {
         return;
     }
-    if (id) {
-        struct ovsdb_symbol *symbol = NULL;
 
-        ctx->error = create_symbol(ctx->symtab, id, &symbol, NULL);
-        if (ctx->error) {
-            return;
+    if (id) {
+        if (uuid_from_string(&uuid_, id)) {
+            uuid = &uuid_;
+            persist_uuid = true;
+        } else {
+            struct ovsdb_symbol *symbol = NULL;
+
+            ctx->error = create_symbol(ctx->symtab, id, &symbol, NULL);
+            if (ctx->error) {
+                return;
+            }
+            if (table->is_root) {
+                /* This table is in the root set, meaning that rows created in
+                 * it won't disappear even if they are unreferenced, so disable
+                 * warnings about that by pretending that there is a
+                 * reference. */
+                symbol->strong_ref = true;
+            }
+            uuid = &symbol->uuid;
         }
-        if (table->is_root) {
-            /* This table is in the root set, meaning that rows created in it
-             * won't disappear even if they are unreferenced, so disable
-             * warnings about that by pretending that there is a reference. */
-            symbol->strong_ref = true;
-        }
-        uuid = &symbol->uuid;
     }
 
-    row = ovsdb_idl_txn_insert(ctx->txn, table, uuid);
+    if (persist_uuid) {
+        row = ovsdb_idl_txn_insert_persist_uuid(ctx->txn, table, uuid);
+    } else {
+        row = ovsdb_idl_txn_insert(ctx->txn, table, uuid);
+    }
+
     for (i = 2; i < ctx->argc; i++) {
         ctx->error = set_column(table, row, ctx->argv[i], ctx->symtab);
         if (ctx->error) {

lib/db-ctl-base.man

@@ -203,7 +203,7 @@ Without \fB\-\-if-exists\fR, it is an error if \fIrecord\fR does not
 exist.  With \fB\-\-if-exists\fR, this command does nothing if
 \fIrecord\fR does not exist.
 .
-.IP "[\fB\-\-id=@\fIname\fR] \fBcreate\fR \fItable column\fR[\fB:\fIkey\fR]\fB=\fIvalue\fR..."
+.IP "[\fB\-\-id=(@\fIname\fR | \fIuuid\fR] \fBcreate\fR \fItable column\fR[\fB:\fIkey\fR]\fB=\fIvalue\fR..."
 Creates a new record in \fItable\fR and sets the initial values of
 each \fIcolumn\fR.  Columns not explicitly set will receive their
 default values.  Outputs the UUID of the new row.
@@ -212,6 +212,9 @@ If \fB@\fIname\fR is specified, then the UUID for the new row may be
 referred to by that name elsewhere in the same \fB\*(PN\fR
 invocation in contexts where a UUID is expected.  Such references may
 precede or follow the \fBcreate\fR command.
+.IP
+If a valid \fIuuid\fR is specified, then it is used as the UUID
+of the new row.
 .
 .RS
 .IP "Caution (ovs-vsctl as example)"

lib/db-ctl-base.xml

@@ -310,7 +310,7 @@
       </p>
     </dd>
 
-    <dt>[<code>--id=@</code><var>name</var>] <code>create</code> <var>table column</var>[<code>:</code><var>key</var>]<code>=</code><var>value</var>...</dt>
+    <dt>[<code>--id=(@</code><var>name</var>|<var>uuid</var>)] <code>create</code> <var>table column</var>[<code>:</code><var>key</var>]<code>=</code><var>value</var>...</dt>
     <dd>
       <p>
         Creates a new record in <var>table</var> and sets the initial values of
@@ -323,6 +323,10 @@
         invocation in contexts where a UUID is expected.  Such references may
         precede or follow the <code>create</code> command.
       </p>
+      <p>
+        If a valid <var>uuid</var> is specified, then it is used as the
+        UUID of the new row.
+      </p>
       <dl>
         <dt>Caution (ovs-vsctl as example)</dt>
         <dd>

lib/ovsdb-idl-provider.h

@@ -74,6 +74,7 @@ struct ovsdb_idl_row {
     struct ovs_list dst_arcs;   /* Backward arcs (ovsdb_idl_arc.dst_node). */
     struct ovsdb_idl_table *table; /* Containing table. */
     struct ovsdb_datum *old_datum; /* Committed data (null if orphaned). */
+    bool persist_uuid;          /* Persist 'uuid' during insert txn if set. */
     bool parsed; /* Whether the row is parsed. */
     struct ovs_list reparse_node; /* Rows that needs to be re-parsed due to
                                    * insertion of a referenced row. */

lib/ovsdb-idl.c

@@ -2855,11 +2855,14 @@ substitute_uuids(struct json *json, const struct ovsdb_idl_txn *txn)
 
             row = ovsdb_idl_txn_get_row(txn, &uuid);
             if (row && !row->old_datum && row->new_datum) {
-                json_destroy(json);
-
-                return json_array_create_2(
-                    json_string_create("named-uuid"),
-                    json_string_create_nocopy(ovsdb_data_row_name(&uuid)));
+                if (row->persist_uuid) {
+                    return json;
+                } else {
+                    json_destroy(json);
+                    return json_array_create_2(
+                        json_string_create("named-uuid"),
+                        json_string_create_nocopy(ovsdb_data_row_name(&uuid)));
+                }
             }
         }
 
@@ -3284,9 +3287,19 @@ ovsdb_idl_txn_commit(struct ovsdb_idl_txn *txn)
 
                 any_updates = true;
 
-                json_object_put(op, "uuid-name",
-                                json_string_create_nocopy(
-                                    ovsdb_data_row_name(&row->uuid)));
+                char *uuid_json;
+                struct json *value;
+                if (row->persist_uuid) {
+                    uuid_json = "uuid";
+                    value = json_string_create_nocopy(
+                        xasprintf(UUID_FMT, UUID_ARGS(&row->uuid)));
+                } else {
+                    uuid_json = "uuid-name";
+                    value = json_string_create_nocopy(
+                                ovsdb_data_row_name(&row->uuid));
+                }
+
+                json_object_put(op, uuid_json, value);
 
                 insert = xmalloc(sizeof *insert);
                 insert->dummy = row->uuid;
@@ -3770,6 +3783,31 @@ ovsdb_idl_txn_delete(const struct ovsdb_idl_row *row_)
     row->new_datum = NULL;
 }
 
+static const struct ovsdb_idl_row *
+ovsdb_idl_txn_insert__(struct ovsdb_idl_txn *txn,
+                       const struct ovsdb_idl_table_class *class,
+                       const struct uuid *uuid,
+                       bool persist_uuid)
+{
+    struct ovsdb_idl_row *row = ovsdb_idl_row_create__(class);
+
+    ovs_assert(uuid || !persist_uuid);
+    if (uuid) {
+        ovs_assert(!ovsdb_idl_txn_get_row(txn, uuid));
+        row->uuid = *uuid;
+    } else {
+        uuid_generate(&row->uuid);
+    }
+    row->persist_uuid = persist_uuid;
+    row->table = ovsdb_idl_table_from_class(txn->idl, class);
+    row->new_datum = xmalloc(class->n_columns * sizeof *row->new_datum);
+    hmap_insert(&row->table->rows, &row->hmap_node, uuid_hash(&row->uuid));
+    hmap_insert(&txn->txn_rows, &row->txn_node, uuid_hash(&row->uuid));
+    ovsdb_idl_add_to_indexes(row);
+
+    return row;
+}
+
 /* Inserts and returns a new row in the table with the specified 'class' in the
  * database with open transaction 'txn'.
  *
@@ -3787,22 +3825,23 @@ ovsdb_idl_txn_insert(struct ovsdb_idl_txn *txn,
                      const struct ovsdb_idl_table_class *class,
                      const struct uuid *uuid)
 {
-    struct ovsdb_idl_row *row = ovsdb_idl_row_create__(class);
+    return ovsdb_idl_txn_insert__(txn, class, uuid, false);
+}
 
-    if (uuid) {
-        ovs_assert(!ovsdb_idl_txn_get_row(txn, uuid));
-        row->uuid = *uuid;
-    } else {
-        uuid_generate(&row->uuid);
-    }
-
-    row->table = ovsdb_idl_table_from_class(txn->idl, class);
-    row->new_datum = xmalloc(class->n_columns * sizeof *row->new_datum);
-    hmap_insert(&row->table->rows, &row->hmap_node, uuid_hash(&row->uuid));
-    hmap_insert(&txn->txn_rows, &row->txn_node, uuid_hash(&row->uuid));
-    ovsdb_idl_add_to_indexes(row);
-
-    return row;
+/* Inserts and returns a new row in the table with the specified 'class' in the
+ * database with open transaction 'txn'.
+ *
+ * The new row is assigned the specified UUID (which cannot be null).
+ *
+ * Usually this function is used indirectly through one of the
+ * "insert_persist_uuid" functions generated by ovsdb-idlc. */
+const struct ovsdb_idl_row *
+ovsdb_idl_txn_insert_persist_uuid(struct ovsdb_idl_txn *txn,
+                                  const struct ovsdb_idl_table_class *class,
+                                  const struct uuid *uuid)
+{
+    ovs_assert(uuid);
+    return ovsdb_idl_txn_insert__(txn, class, uuid, true);
 }
 
 static void

lib/ovsdb-idl.h

@@ -375,6 +375,9 @@ void ovsdb_idl_txn_delete(const struct ovsdb_idl_row *);
 const struct ovsdb_idl_row *ovsdb_idl_txn_insert(
     struct ovsdb_idl_txn *, const struct ovsdb_idl_table_class *,
     const struct uuid *);
+const struct ovsdb_idl_row *ovsdb_idl_txn_insert_persist_uuid(
+    struct ovsdb_idl_txn *txn, const struct ovsdb_idl_table_class *class,
+    const struct uuid *uuid);
 
 struct ovsdb_idl *ovsdb_idl_txn_get_idl (struct ovsdb_idl_txn *);
 void ovsdb_idl_get_initial_snapshot(struct ovsdb_idl *);

ovsdb/ovsdb-idlc.in

@@ -362,6 +362,8 @@ struct %(s)s *%(s)s_cursor_data(struct ovsdb_idl_cursor *);
 void %(s)s_init(struct %(s)s *);
 void %(s)s_delete(const struct %(s)s *);
 struct %(s)s *%(s)s_insert(struct ovsdb_idl_txn *);
+struct %(s)s *%(s)s_insert_persist_uuid(
+    struct ovsdb_idl_txn *txn, const struct uuid *uuid);
 
 /* Returns true if the tracked column referenced by 'enum %(s)s_column_id' of
  * the row referenced by 'struct %(s)s *' was updated since the last change
@@ -809,6 +811,19 @@ struct %(s)s *
     return %(s)s_cast(ovsdb_idl_txn_insert(txn, &%(p)stable_%(tl)s, NULL));
 }
 
+/* Inserts and returns a new row in the table "%(t)s" in the database
+ * with open transaction 'txn'.
+ *
+ * The new row is assigned the UUID specified in the 'uuid' parameter
+ * (which cannot be null).  ovsdb-server will try to assign the same
+ * UUID when 'txn' is committed. */
+struct %(s)s *
+%(s)s_insert_persist_uuid(struct ovsdb_idl_txn *txn, const struct uuid *uuid)
+{
+    return %(s)s_cast(ovsdb_idl_txn_insert_persist_uuid(
+        txn, &%(p)stable_%(tl)s, uuid));
+}
+
 bool
 %(s)s_is_updated(const struct %(s)s *row, enum %(s)s_column_id column)
 {

python/ovs/db/idl.py

@@ -1223,7 +1223,7 @@ class Row(object):
         d["a"] = "b"
         row.mycolumn = d
 """
-    def __init__(self, idl, table, uuid, data):
+    def __init__(self, idl, table, uuid, data, persist_uuid=False):
         # All of the explicit references to self.__dict__ below are required
         # to set real attributes with invoking self.__getattr__().
         self.__dict__["uuid"] = uuid
@@ -1278,6 +1278,10 @@ class Row(object):
         # in the dictionary are all None.
         self.__dict__["_prereqs"] = {}
 
+        # Indicates if the specified 'uuid' should be used as the row uuid
+        # or let the server generate it.
+        self.__dict__["_persist_uuid"] = persist_uuid
+
     def __lt__(self, other):
         if not isinstance(other, Row):
             return NotImplemented
@@ -1816,7 +1820,11 @@ class Transaction(object):
                 op = {"table": row._table.name}
                 if row._data is None:
                     op["op"] = "insert"
-                    op["uuid-name"] = _uuid_name_from_uuid(row.uuid)
+                    if row._persist_uuid:
+                        op["uuid"] = row.uuid
+                    else:
+                        op["uuid-name"] = _uuid_name_from_uuid(row.uuid)
+
                     any_updates = True
 
                     op_index = len(operations) - 1
@@ -2056,20 +2064,22 @@ class Transaction(object):
             row._mutations['_removes'].pop(column.name, None)
         row._changes[column.name] = datum.copy()
 
-    def insert(self, table, new_uuid=None):
+    def insert(self, table, new_uuid=None, persist_uuid=False):
         """Inserts and returns a new row in 'table', which must be one of the
         ovs.db.schema.TableSchema objects in the Idl's 'tables' dict.
 
         The new row is assigned a provisional UUID.  If 'uuid' is None then one
         is randomly generated; otherwise 'uuid' should specify a randomly
-        generated uuid.UUID not otherwise in use.  ovsdb-server will assign a
-        different UUID when 'txn' is committed, but the IDL will replace any
-        uses of the provisional UUID in the data to be to be committed by the
-        UUID assigned by ovsdb-server."""
+        generated uuid.UUID not otherwise in use.  If 'persist_uuid' is true
+        and 'new_uuid' is specified, IDL requests the ovsdb-server to assign
+        the same UUID, otherwise ovsdb-server will assign a different UUID when
+        'txn' is committed and the IDL will replace any uses of the provisional
+        UUID in the data to be committed by the UUID assigned by
+        ovsdb-server."""
         assert self._status == Transaction.UNCOMMITTED
         if new_uuid is None:
             new_uuid = uuid.uuid4()
-        row = Row(self.idl, table, new_uuid, None)
+        row = Row(self.idl, table, new_uuid, None, persist_uuid=persist_uuid)
         table.rows[row.uuid] = row
         self._txn_rows[row.uuid] = row
         return row

tests/ovs-vsctl.at

@@ -1710,3 +1710,28 @@ ingress_policing_kpkts_rate: 100
 ])
 OVS_VSCTL_CLEANUP
 AT_CLEANUP
+
+AT_SETUP([ovs-vsctl create bridge with uuid])
+AT_KEYWORDS([create bridge with uuid])
+OVS_VSCTL_SETUP
+
+AT_CHECK([ovs-vsctl --no-wait --id=c5cc12f8-eaa1-43a7-8a73-bccd18df1111 create bridge \
+name=tst0 -- add open . bridges c5cc12f8-eaa1-43a7-8a73-bccd18df1111], [0],[dnl
+c5cc12f8-eaa1-43a7-8a73-bccd18df1111
+])
+
+AT_CHECK([ovs-vsctl --no-wait --id=c5cc12f8-eaa1-43a7-8a73-bccd18df1111 create bridge \
+name=tst1 -- add open . bridges c5cc12f8-eaa1-43a7-8a73-bccd18df1111], [1], [ignore], [ignore])
+
+AT_CHECK([ovs-vsctl --no-wait --bare --columns _uuid,name list bridge], [0], [dnl
+c5cc12f8-eaa1-43a7-8a73-bccd18df1111
+tst0
+])
+
+ovs-vsctl --no-wait --id=@a create bridge \
+name=tst1 -- add open . bridges @a
+
+AT_CHECK([ovs-vsctl --no-wait --bare --columns _uuid,name list bridge tst1], [0], [ignore])
+
+OVS_VSCTL_CLEANUP
+AT_CLEANUP

tests/ovsdb-idl.at

@@ -2555,3 +2555,61 @@ OVSDB_CHECK_IDL_TRACK([track, insert and delete, refs to link2],
 005: table link2: i=1 l1= uuid=<1>
 006: done
 ]])
+
+m4_define([OVSDB_CHECK_IDL_PERS_UUID_INSERT_C],
+  [AT_SETUP([$1 - C])
+   AT_KEYWORDS([idl persistent uuid insert])
+   AT_CHECK([ovsdb_start_idltest "" "$abs_srcdir/idltest.ovsschema"])
+   AT_CHECK([test-ovsdb '-vPATTERN:console:test-ovsdb|%c|%m' -vjsonrpc -t10 idl unix:socket $2],
+            [0], [stdout], [stderr])
+   AT_CHECK([sort stdout],
+            [0], [$3])
+   AT_CHECK([grep $4 stderr], [0], [ignore])
+   OVSDB_SERVER_SHUTDOWN
+   AT_CLEANUP])
+
+m4_define([OVSDB_CHECK_IDL_PERS_UUID_INSERT_PY],
+  [AT_SETUP([$1 - Python3])
+   AT_KEYWORDS([idl persistent uuid insert])
+   AT_CHECK([ovsdb_start_idltest "" "$abs_srcdir/idltest.ovsschema"])
+   AT_CHECK([$PYTHON3 $srcdir/test-ovsdb.py  -t10 idl $srcdir/idltest.ovsschema unix:socket $2],
+            [0], [stdout], [stderr])
+   AT_CHECK([sort stdout],
+            [0], [$3])
+   AT_CHECK([grep $4 stderr], [0], [ignore])
+   OVSDB_SERVER_SHUTDOWN
+   AT_CLEANUP])
+
+
+m4_define([OVSDB_CHECK_IDL_PERS_UUID_INSERT],
+  [OVSDB_CHECK_IDL_PERS_UUID_INSERT_C($@)
+   OVSDB_CHECK_IDL_PERS_UUID_INSERT_PY($@)])
+
+OVSDB_CHECK_IDL_PERS_UUID_INSERT([simple idl, persistent uuid insert],
+  [['insert_uuid c5cc12f8-eaa1-43a7-8a73-bccd18df2222 2, insert_uuid c5cc12f8-eaa1-43a7-8a73-bccd18df3333 3' \
+    'insert_uuid c5cc12f8-eaa1-43a7-8a73-bccd18df4444 4, insert_uuid c5cc12f8-eaa1-43a7-8a73-bccd18df2222 5' \
+    'insert_uuid c5cc12f8-eaa1-43a7-8a73-bccd18df4444 4' \
+    'delete 2' \
+    'insert_uuid c5cc12f8-eaa1-43a7-8a73-bccd18df2222 5'
+    ]],
+  [[000: empty
+001: commit, status=success
+002: table simple: i=2 r=0 b=false s= u=00000000-0000-0000-0000-000000000000 ia=[] ra=[] ba=[] sa=[] ua=[] uuid=c5cc12f8-eaa1-43a7-8a73-bccd18df2222
+002: table simple: i=3 r=0 b=false s= u=00000000-0000-0000-0000-000000000000 ia=[] ra=[] ba=[] sa=[] ua=[] uuid=c5cc12f8-eaa1-43a7-8a73-bccd18df3333
+003: commit, status=error
+004: table simple: i=2 r=0 b=false s= u=00000000-0000-0000-0000-000000000000 ia=[] ra=[] ba=[] sa=[] ua=[] uuid=c5cc12f8-eaa1-43a7-8a73-bccd18df2222
+004: table simple: i=3 r=0 b=false s= u=00000000-0000-0000-0000-000000000000 ia=[] ra=[] ba=[] sa=[] ua=[] uuid=c5cc12f8-eaa1-43a7-8a73-bccd18df3333
+005: commit, status=success
+006: table simple: i=2 r=0 b=false s= u=00000000-0000-0000-0000-000000000000 ia=[] ra=[] ba=[] sa=[] ua=[] uuid=c5cc12f8-eaa1-43a7-8a73-bccd18df2222
+006: table simple: i=3 r=0 b=false s= u=00000000-0000-0000-0000-000000000000 ia=[] ra=[] ba=[] sa=[] ua=[] uuid=c5cc12f8-eaa1-43a7-8a73-bccd18df3333
+006: table simple: i=4 r=0 b=false s= u=00000000-0000-0000-0000-000000000000 ia=[] ra=[] ba=[] sa=[] ua=[] uuid=c5cc12f8-eaa1-43a7-8a73-bccd18df4444
+007: commit, status=success
+008: table simple: i=3 r=0 b=false s= u=00000000-0000-0000-0000-000000000000 ia=[] ra=[] ba=[] sa=[] ua=[] uuid=c5cc12f8-eaa1-43a7-8a73-bccd18df3333
+008: table simple: i=4 r=0 b=false s= u=00000000-0000-0000-0000-000000000000 ia=[] ra=[] ba=[] sa=[] ua=[] uuid=c5cc12f8-eaa1-43a7-8a73-bccd18df4444
+009: commit, status=success
+010: table simple: i=3 r=0 b=false s= u=00000000-0000-0000-0000-000000000000 ia=[] ra=[] ba=[] sa=[] ua=[] uuid=c5cc12f8-eaa1-43a7-8a73-bccd18df3333
+010: table simple: i=4 r=0 b=false s= u=00000000-0000-0000-0000-000000000000 ia=[] ra=[] ba=[] sa=[] ua=[] uuid=c5cc12f8-eaa1-43a7-8a73-bccd18df4444
+010: table simple: i=5 r=0 b=false s= u=00000000-0000-0000-0000-000000000000 ia=[] ra=[] ba=[] sa=[] ua=[] uuid=c5cc12f8-eaa1-43a7-8a73-bccd18df2222
+011: done
+]],
+  [['This UUID would duplicate a UUID already present within the table or deleted within the same transaction']])

tests/test-ovsdb.c

@@ -2400,7 +2400,7 @@ idltest_find_simple(struct ovsdb_idl *idl, int i)
     return NULL;
 }
 
-static void
+static bool
 idl_set(struct ovsdb_idl *idl, char *commands, int step)
 {
     char *cmd, *save_ptr1 = NULL;
@@ -2458,6 +2458,19 @@ idl_set(struct ovsdb_idl *idl, char *commands, int step)
 
             s = idltest_simple_insert(txn);
             idltest_simple_set_i(s, atoi(arg1));
+        } else if (!strcmp(name, "insert_uuid")) {
+            struct idltest_simple *s;
+
+            if (!arg1 || !arg2) {
+                ovs_fatal(0, "\"insert\" command requires 2 arguments");
+            }
+
+            struct uuid s_uuid;
+            if (!uuid_from_string(&s_uuid, arg1)) {
+                 ovs_fatal(0, "\"insert_uuid\" command requires valid uuid");
+            }
+            s = idltest_simple_insert_persist_uuid(txn, &s_uuid);
+            idltest_simple_set_i(s, atoi(arg2));
         } else if (!strcmp(name, "delete")) {
             const struct idltest_simple *s;
 
@@ -2522,7 +2535,7 @@ idl_set(struct ovsdb_idl *idl, char *commands, int step)
             print_and_log("%03d: destroy", step);
             ovsdb_idl_txn_destroy(txn);
             ovsdb_idl_check_consistency(idl);
-            return;
+            return true;
         } else {
             ovs_fatal(0, "unknown command %s", name);
         }
@@ -2543,6 +2556,8 @@ idl_set(struct ovsdb_idl *idl, char *commands, int step)
 
     ovsdb_idl_txn_destroy(txn);
     ovsdb_idl_check_consistency(idl);
+
+    return (status != TXN_ERROR);
 }
 
 static const struct ovsdb_idl_table_class *
@@ -2777,7 +2792,14 @@ do_idl(struct ovs_cmdl_context *ctx)
             update_conditions(idl, arg + strlen(cond_s));
             print_and_log("%03d: change conditions", step++);
         } else if (arg[0] != '[') {
-            idl_set(idl, arg, step++);
+            if (!idl_set(idl, arg, step++)) {
+                /* If idl_set() returns false, then no transaction
+                 * was sent to the server and most likely 'seqno'
+                 * would remain the same.  And the above 'Wait for update'
+                 * for loop poll_block() would never return.
+                 * So set seqno to 0. */
+                seqno = 0;
+            }
         } else {
             struct json *json = parse_json(arg);
             substitute_uuids(json, symtab);

tests/test-ovsdb.py

@@ -429,6 +429,14 @@ def idl_set(idl, commands, step):
 
             s = txn.insert(idl.tables["simple"])
             s.i = int(args[0])
+        elif name == "insert_uuid":
+            if len(args) != 2:
+                sys.stderr.write('"set" command requires 2 argument\n')
+                sys.exit(1)
+
+            s = txn.insert(idl.tables["simple"], new_uuid=args[0],
+                           persist_uuid=True)
+            s.i = int(args[1])
         elif name == "delete":
             if len(args) != 1:
                 sys.stderr.write('"delete" command requires 1 argument\n')
@@ -491,7 +499,7 @@ def idl_set(idl, commands, step):
             print("%03d: destroy" % step)
             sys.stdout.flush()
             txn.abort()
-            return
+            return True
         elif name == "linktest":
             l1_0 = txn.insert(idl.tables["link1"])
             l1_0.i = 1
@@ -615,6 +623,8 @@ def idl_set(idl, commands, step):
     sys.stdout.write("\n")
     sys.stdout.flush()
 
+    return status != ovs.db.idl.Transaction.ERROR
+
 
 def update_condition(idl, commands):
     commands = commands[len("condition "):].split(";")
@@ -748,7 +758,13 @@ def do_idl(schema_file, remote, *commands):
             sys.stdout.flush()
             step += 1
         elif not command.startswith("["):
-            idl_set(idl, command, step)
+            if not idl_set(idl, command, step):
+                # If idl_set() returns false, then no transaction
+                # was sent to the server and most likely seqno
+                # would remain the same.  And the above 'Wait for update'
+                # for loop poller.block() would never return.
+                # So set seqno to 0.
+                seqno = 0
             step += 1
         else:
             json = ovs.json.from_string(command)