Make open_cores load viable by adding getter for cores

Signed-off-by: Jan Musial <jan.musial@intel.com>

tests/functional/pyocf/types/cache.py

@@ -38,6 +38,7 @@ from .stats.cache import CacheInfo
 from .ioclass import IoClassesInfo, IoClassInfo
 from .stats.shared import UsageStats, RequestsStats, BlocksStats, ErrorsStats
 from .ctx import OcfCtx
+from .volume import Volume
 
 
 class Backfill(Structure):
@@ -593,6 +594,27 @@ class Cache:
     def write_unlock(self):
         self.owner.lib.ocf_mngt_cache_unlock(self.cache_handle)
 
+    def get_core_by_name(self, name: str):
+        core_handle = c_void_p()
+
+        result = self.owner.lib.ocf_core_get_by_name(
+            self.cache_handle,
+            name.encode("ascii"),
+            len(name),
+            byref(core_handle),
+        )
+        if result != 0:
+            raise OcfError("Failed getting core by name", result)
+
+        uuid = self.owner.lib.ocf_core_get_uuid_wrapper(core_handle)
+        device = Volume.get_by_uuid(uuid.contents._data.decode("ascii"))
+        core = Core(device)
+        core.cache = self
+        core.handle = core_handle
+        self.cores.append(core)
+
+        return core
+
     def add_core(self, core: Core, try_add=False):
         cfg = core.get_config()
 
@@ -741,6 +763,11 @@ class Cache:
         self.mngt_queue.put()
         del self.io_queues[:]
 
+        self.started = False
+        for core in self.cores:
+            core.cache = None
+            core.handle = None
+
         self.write_unlock()
         self.device = None
         self.started = False

tests/functional/pyocf/types/core.py

@@ -19,6 +19,7 @@ from ctypes import (
     cast,
     byref,
     create_string_buffer,
+    POINTER,
 )
 from datetime import timedelta
 
@@ -58,7 +59,6 @@ class Core:
     def __init__(
         self,
         device: Volume,
-        try_add: bool,
         name: str = "core",
         seq_cutoff_threshold: int = DEFAULT_SEQ_CUTOFF_THRESHOLD,
         seq_cutoff_promotion_count: int = DEFAULT_SEQ_CUTOFF_PROMOTION_COUNT,
@@ -73,7 +73,7 @@ class Core:
 
     @classmethod
     def using_device(cls, device, **kwargs):
-        c = cls(device=device, try_add=False, **kwargs)
+        c = cls(device=device, **kwargs)
 
         return c
 
@@ -222,6 +222,8 @@ class Core:
 
 
 lib = OcfLib.getInstance()
+lib.ocf_core_get_uuid_wrapper.restype = POINTER(Uuid)
+lib.ocf_core_get_uuid_wrapper.argtypes = [c_void_p]
 lib.ocf_core_get_volume.restype = c_void_p
 lib.ocf_volume_new_io.argtypes = [
     c_void_p,