Ensure inproc properly emulates serialization protocol (#8622)

distributed/comm/inproc.py

@@ -13,7 +13,7 @@
 
 from distributed.comm.core import BaseListener, Comm, CommClosedError, Connector
 from distributed.comm.registry import Backend, backends
-from distributed.protocol import nested_deserialize
+from distributed.protocol.serialize import _nested_deserialize
 from distributed.utils import get_ip, is_python_shutting_down
 
 logger = logging.getLogger(__name__)
@@ -218,8 +218,7 @@ async def read(self, deserializers="ignored"):
             self._finalizer.detach()
             raise CommClosedError()
 
-        if self.deserialize:
-            msg = nested_deserialize(msg)
+        msg = _nested_deserialize(msg, self.deserialize)
         return msg
 
     async def write(self, msg, serializers=None, on_error=None):

distributed/protocol/__init__.py

@@ -6,8 +6,10 @@
 from distributed.protocol.core import decompress, dumps, loads, maybe_compress, msgpack
 from distributed.protocol.cuda import cuda_deserialize, cuda_serialize
 from distributed.protocol.serialize import (
+    Pickled,
     Serialize,
     Serialized,
+    ToPickle,
     dask_deserialize,
     dask_serialize,
     deserialize,

distributed/protocol/serialize.py

@@ -3,6 +3,7 @@
 import codecs
 import importlib
 import traceback
+import warnings
 from array import array
 from enum import Enum
 from functools import partial
@@ -621,6 +622,14 @@ def __ne__(self, other):
 
 
 def nested_deserialize(x):
+    warnings.warn(
+        "nested_deserialize is deprecated and will be removed in a future release.",
+        DeprecationWarning,
+    )
+    return _nested_deserialize(x, emulate_deserialize=True)
+
+
+def _nested_deserialize(x, emulate_deserialize=True):
     """
     Replace all Serialize and Serialized values nested in *x*
     with the original values.  Returns a copy of *x*.
@@ -637,21 +646,27 @@ def replace_inner(x):
                 typ = type(v)
                 if typ is dict or typ is list:
                     x[k] = replace_inner(v)
-                elif typ is Serialize:
+                if emulate_deserialize:
+                    if typ is Serialize:
+                        x[k] = v.data
+                    elif typ is Serialized:
+                        x[k] = deserialize(v.header, v.frames)
+                if typ is ToPickle:
                     x[k] = v.data
-                elif typ is Serialized:
-                    x[k] = deserialize(v.header, v.frames)
 
         elif type(x) is list:
             x = list(x)
             for k, v in enumerate(x):
                 typ = type(v)
                 if typ is dict or typ is list:
                     x[k] = replace_inner(v)
-                elif typ is Serialize:
+                if emulate_deserialize:
+                    if typ is Serialize:
+                        x[k] = v.data
+                    elif typ is Serialized:
+                        x[k] = deserialize(v.header, v.frames)
+                if typ is ToPickle:
                     x[k] = v.data
-                elif typ is Serialized:
-                    x[k] = deserialize(v.header, v.frames)
 
         return x
 

distributed/protocol/tests/test_serialize.py

@@ -20,12 +20,12 @@
 from distributed.protocol import (
     Serialize,
     Serialized,
+    ToPickle,
     dask_serialize,
     deserialize,
     deserialize_bytes,
     dumps,
     loads,
-    nested_deserialize,
     register_serialization,
     register_serialization_family,
     serialize,
@@ -35,6 +35,7 @@
 )
 from distributed.protocol.serialize import (
     _is_msgpack_serializable,
+    _nested_deserialize,
     check_dask_serializable,
 )
 from distributed.utils import ensure_memoryview, nbytes
@@ -166,12 +167,24 @@ def test_nested_deserialize():
         "x": [to_serialize(123), to_serialize(456), 789],
         "y": {"a": ["abc", Serialized(*serialize("def"))], "b": b"ghi"},
     }
+
+    x_orig = copy.deepcopy(x)
+    assert _nested_deserialize(x, emulate_deserialize=False) == x_orig
+
+    assert x == x_orig  # x wasn't mutated
+    x["topickle"] = ToPickle(1)
+    x["topickle_nested"] = [1, ToPickle(2)]
     x_orig = copy.deepcopy(x)
+    assert (out := _nested_deserialize(x, emulate_deserialize=False)) != x_orig
+    assert out["topickle"] == 1
+    assert out["topickle_nested"] == [1, 2]
 
-    assert nested_deserialize(x) == {
+    assert _nested_deserialize(x) == {
         "op": "update",
         "x": [123, 456, 789],
         "y": {"a": ["abc", "def"], "b": b"ghi"},
+        "topickle": 1,
+        "topickle_nested": [1, 2],
     }
     assert x == x_orig  # x wasn't mutated
 

distributed/scheduler.py

@@ -4676,9 +4676,6 @@ async def update_graph(
         annotations: dict | None = None,
         stimulus_id: str | None = None,
     ) -> None:
-        # FIXME: Apparently empty dicts arrive as a ToPickle object
-        if isinstance(annotations, ToPickle):
-            annotations = annotations.data  # type: ignore[unreachable]
         start = time()
         try:
             try:

distributed/shuffle/tests/utils.py

@@ -22,15 +22,15 @@ def __init__(self, shuffle: ShuffleRun):
 
     def __getattr__(self, key):
         async def _(**kwargs):
-            from distributed.protocol.serialize import nested_deserialize
+            from distributed.protocol.serialize import _nested_deserialize
 
             method_name = key.replace("shuffle_", "")
             kwargs.pop("shuffle_id", None)
             kwargs.pop("run_id", None)
             # TODO: This is a bit awkward. At some point the arguments are
             # already getting wrapped with a `Serialize`. We only want to unwrap
             # here.
-            kwargs = nested_deserialize(kwargs)
+            kwargs = _nested_deserialize(kwargs)
             meth = getattr(self.shuffle, method_name)
             return await meth(**kwargs)