Add gcs object manager (#8298)

python/ray/includes/global_state_accessor.pxd

@@ -1,6 +1,10 @@
 from libcpp.string cimport string as c_string
 from libcpp cimport bool as c_bool
 from libcpp.vector cimport vector as c_vector
+from libcpp.memory cimport unique_ptr
+from ray.includes.unique_ids cimport (
+    CObjectID
+)
 
 cdef extern from "ray/gcs/gcs_client/global_state_accessor.h" nogil:
     cdef cppclass CGlobalStateAccessor "ray::gcs::GlobalStateAccessor":
@@ -11,3 +15,5 @@ cdef extern from "ray/gcs/gcs_client/global_state_accessor.h" nogil:
         void Disconnect()
         c_vector[c_string] GetAllJobInfo()
         c_vector[c_string] GetAllProfileInfo()
+        c_vector[c_string] GetAllObjectInfo()
+        unique_ptr[c_string] GetObjectInfo(const CObjectID &object_id)

python/ray/includes/global_state_accessor.pxi

@@ -1,7 +1,13 @@
+from ray.includes.unique_ids cimport (
+    CObjectID
+)
+
 from ray.includes.global_state_accessor cimport (
     CGlobalStateAccessor,
 )
 
+from libcpp.string cimport string as c_string
+
 cdef class GlobalStateAccessor:
     """Cython wrapper class of C++ `ray::gcs::GlobalStateAccessor`."""
     cdef:
@@ -25,3 +31,12 @@ cdef class GlobalStateAccessor:
 
     def get_profile_table(self):
         return self.inner.get().GetAllProfileInfo()
+
+    def get_object_table(self):
+        return self.inner.get().GetAllObjectInfo()
+
+    def get_object_info(self, object_id):
+        object_info = self.inner.get().GetObjectInfo(CObjectID.FromBinary(object_id.binary()))
+        if object_info:
+            return c_string(object_info.get().data(), object_info.get().size())
+        return None