[#148] Add support for custom registry during read operations

Signed-off-by: Andrey Berezin <a.berezin@yadro.com>

src/frostfs_testlib/load/load_config.py

@@ -205,8 +205,12 @@ class LoadParams:
     object_size: Optional[int] = metadata_field(all_load_scenarios, "size", "WRITE_OBJ_SIZE", False)
     # For read operations, controls from which set get objects to read
     read_from: Optional[ReadFrom] = None
+    # For read operations done from REGISTRY, controls delay which object should live before it will be used for read operation
+    read_age: Optional[int] = metadata_field(all_load_scenarios, None, "READ_AGE", False)
     # Output registry K6 file. Filled automatically.
     registry_file: Optional[str] = metadata_field(all_scenarios, None, "REGISTRY_FILE", False)
+    # In case if we want to use custom registry file left from another load run
+    custom_registry: Optional[str] = None
     # Specifies the minimum duration of every single execution (i.e. iteration).
     # Any iterations that are shorter than this value will cause that VU to
     # sleep for the remainder of the time until the specified minimum duration is reached.
@@ -294,6 +298,11 @@ class LoadParams:
 
         if self.read_from == ReadFrom.REGISTRY:
             self.registry_file = os.path.join(self.working_dir, f"{load_id}_registry.bolt")
+
+            # For now it's okay to have it this way
+            if self.custom_registry is not None:
+                self.registry_file = self.custom_registry
+
         if self.read_from == ReadFrom.PRESET:
             self.registry_file = None