feat(app): avoid nested cursors in model_records service

invokeai/app/services/model_records/model_records_sql.py

@@ -78,7 +78,6 @@ class ModelRecordServiceSQL(ModelRecordServiceBase):
         """
         super().__init__()
         self._db = db
-        self._cursor = db.conn.cursor()
         self._logger = logger
 
     @property
@@ -97,7 +96,8 @@ class ModelRecordServiceSQL(ModelRecordServiceBase):
         Can raise DuplicateModelException and InvalidModelConfigException exceptions.
         """
         try:
-            self._cursor.execute(
+            cursor = self._db.conn.cursor()
+            cursor.execute(
                 """--sql
                 INSERT INTO models (
                     id,
@@ -139,14 +139,15 @@ class ModelRecordServiceSQL(ModelRecordServiceBase):
         Can raise an UnknownModelException
         """
         try:
-            self._cursor.execute(
+            cursor = self._db.conn.cursor()
+            cursor.execute(
                 """--sql
                 DELETE FROM models
                 WHERE id=?;
                 """,
                 (key,),
             )
-            if self._cursor.rowcount == 0:
+            if cursor.rowcount == 0:
                 raise UnknownModelException("model not found")
             self._db.conn.commit()
         except sqlite3.Error as e:
@@ -163,7 +164,8 @@ class ModelRecordServiceSQL(ModelRecordServiceBase):
         json_serialized = record.model_dump_json()
 
         try:
-            self._cursor.execute(
+            cursor = self._db.conn.cursor()
+            cursor.execute(
                 """--sql
                 UPDATE models
                 SET
@@ -172,7 +174,7 @@ class ModelRecordServiceSQL(ModelRecordServiceBase):
                 """,
                 (json_serialized, key),
             )
-            if self._cursor.rowcount == 0:
+            if cursor.rowcount == 0:
                 raise UnknownModelException("model not found")
             self._db.conn.commit()
         except sqlite3.Error as e:
@@ -189,28 +191,30 @@ class ModelRecordServiceSQL(ModelRecordServiceBase):
 
         Exceptions: UnknownModelException
         """
-        self._cursor.execute(
+        cursor = self._db.conn.cursor()
+        cursor.execute(
             """--sql
             SELECT config, strftime('%s',updated_at) FROM models
             WHERE id=?;
             """,
             (key,),
         )
-        rows = self._cursor.fetchone()
+        rows = cursor.fetchone()
         if not rows:
             raise UnknownModelException("model not found")
         model = ModelConfigFactory.make_config(json.loads(rows[0]), timestamp=rows[1])
         return model
 
     def get_model_by_hash(self, hash: str) -> AnyModelConfig:
-        self._cursor.execute(
+        cursor = self._db.conn.cursor()
+        cursor.execute(
             """--sql
             SELECT config, strftime('%s',updated_at) FROM models
             WHERE hash=?;
             """,
             (hash,),
         )
-        rows = self._cursor.fetchone()
+        rows = cursor.fetchone()
         if not rows:
             raise UnknownModelException("model not found")
         model = ModelConfigFactory.make_config(json.loads(rows[0]), timestamp=rows[1])
@@ -222,14 +226,15 @@ class ModelRecordServiceSQL(ModelRecordServiceBase):
 
         :param key: Unique key for the model to be deleted
         """
-        self._cursor.execute(
+        cursor = self._db.conn.cursor()
+        cursor.execute(
             """--sql
             select count(*) FROM models
             WHERE id=?;
             """,
             (key,),
         )
-        count = self._cursor.fetchone()[0]
+        count = cursor.fetchone()[0]
         return count > 0
 
     def search_by_attr(
@@ -277,7 +282,9 @@ class ModelRecordServiceSQL(ModelRecordServiceBase):
             where_clause.append("format=?")
             bindings.append(model_format)
         where = f"WHERE {' AND '.join(where_clause)}" if where_clause else ""
-        self._cursor.execute(
+
+        cursor = self._db.conn.cursor()
+        cursor.execute(
             f"""--sql
             SELECT config, strftime('%s',updated_at)
             FROM models
@@ -286,7 +293,7 @@ class ModelRecordServiceSQL(ModelRecordServiceBase):
             """,
             tuple(bindings),
         )
-        result = self._cursor.fetchall()
+        result = cursor.fetchall()
 
         # Parse the model configs.
         results: list[AnyModelConfig] = []
@@ -305,26 +312,28 @@ class ModelRecordServiceSQL(ModelRecordServiceBase):
 
     def search_by_path(self, path: Union[str, Path]) -> List[AnyModelConfig]:
         """Return models with the indicated path."""
-        self._cursor.execute(
+        cursor = self._db.conn.cursor()
+        cursor.execute(
             """--sql
             SELECT config, strftime('%s',updated_at) FROM models
             WHERE path=?;
             """,
             (str(path),),
         )
-        results = [ModelConfigFactory.make_config(json.loads(x[0]), timestamp=x[1]) for x in self._cursor.fetchall()]
+        results = [ModelConfigFactory.make_config(json.loads(x[0]), timestamp=x[1]) for x in cursor.fetchall()]
         return results
 
     def search_by_hash(self, hash: str) -> List[AnyModelConfig]:
         """Return models with the indicated hash."""
-        self._cursor.execute(
+        cursor = self._db.conn.cursor()
+        cursor.execute(
             """--sql
             SELECT config, strftime('%s',updated_at) FROM models
             WHERE hash=?;
             """,
             (hash,),
         )
-        results = [ModelConfigFactory.make_config(json.loads(x[0]), timestamp=x[1]) for x in self._cursor.fetchall()]
+        results = [ModelConfigFactory.make_config(json.loads(x[0]), timestamp=x[1]) for x in cursor.fetchall()]
         return results
 
     def list_models(
@@ -340,18 +349,20 @@ class ModelRecordServiceSQL(ModelRecordServiceBase):
             ModelRecordOrderBy.Format: "format",
         }
 
+        cursor = self._db.conn.cursor()
+
         # Lock so that the database isn't updated while we're doing the two queries.
         # query1: get the total number of model configs
-        self._cursor.execute(
+        cursor.execute(
             """--sql
             select count(*) from models;
             """,
             (),
         )
-        total = int(self._cursor.fetchone()[0])
+        total = int(cursor.fetchone()[0])
 
         # query2: fetch key fields
-        self._cursor.execute(
+        cursor.execute(
             f"""--sql
             SELECT config
             FROM models
@@ -364,6 +375,6 @@ class ModelRecordServiceSQL(ModelRecordServiceBase):
                 page * per_page,
             ),
         )
-        rows = self._cursor.fetchall()
+        rows = cursor.fetchall()
         items = [ModelSummary.model_validate(dict(x)) for x in rows]
         return PaginatedResults(page=page, pages=ceil(total / per_page), per_page=per_page, total=total, items=items)