tests/test_caps_based_msging.py

@@ -7,6 +7,7 @@ B~)
 '''
 from typing import (
     Any,
+    _GenericAlias,
     Type,
     Union,
 )
@@ -25,23 +26,20 @@ from msgspec import (
 import pytest
 import tractor
 from tractor.msg import (
-    _codec,
+    _def_msgspec_codec,
     _ctxvar_MsgCodec,
 
     NamespacePath,
     MsgCodec,
     mk_codec,
     apply_codec,
-    current_codec,
+    current_msgspec_codec,
 )
-from tractor.msg import (
+from tractor.msg import types
-    types,
-)
-from tractor import _state
 from tractor.msg.types import (
     # PayloadT,
     Msg,
-    Started,
+    # Started,
     mk_msg_spec,
 )
 import trio
@@ -62,110 +60,56 @@ def test_msg_spec_xor_pld_spec():
         )
 
 
+# TODO: wrap these into `._codec` such that user can just pass
+# a type table of some sort?
+def enc_hook(obj: Any) -> Any:
+    if isinstance(obj, NamespacePath):
+        return str(obj)
+    else:
+        raise NotImplementedError(
+            f'Objects of type {type(obj)} are not supported'
+        )
+
+
+def dec_hook(type: Type, obj: Any) -> Any:
+    print(f'type is: {type}')
+    if type is NamespacePath:
+        return NamespacePath(obj)
+    else:
+        raise NotImplementedError(
+            f'Objects of type {type(obj)} are not supported'
+        )
+
+
 def ex_func(*args):
     print(f'ex_func({args})')
 
 
 def mk_custom_codec(
-    pld_spec: Union[Type]|Any,
+    ipc_msg_spec: Type[Any] = Any,
-
 ) -> MsgCodec:
-    '''
+    # apply custom hooks and set a `Decoder` which only
-    Create custom `msgpack` enc/dec-hooks and set a `Decoder`
+    # loads `NamespacePath` types.
-    which only loads `NamespacePath` types.
-
-    '''
-    uid: tuple[str, str] = tractor.current_actor().uid
-
-    # XXX NOTE XXX: despite defining `NamespacePath` as a type
-    # field on our `Msg.pld`, we still need a enc/dec_hook() pair
-    # to cast to/from that type on the wire. See the docs:
-    # https://jcristharif.com/msgspec/extending.html#mapping-to-from-native-types
-
-    def enc_nsp(obj: Any) -> Any:
-        match obj:
-            case NamespacePath():
-                print(
-                    f'{uid}: `NamespacePath`-Only ENCODE?\n'
-                    f'type: {type(obj)}\n'
-                    f'obj: {obj}\n'
-                )
-
-                return str(obj)
-
-        logmsg: str = (
-            f'{uid}: Encoding `{obj}: <{type(obj)}>` not supported'
-            f'type: {type(obj)}\n'
-            f'obj: {obj}\n'
-        )
-        print(logmsg)
-        raise NotImplementedError(logmsg)
-
-    def dec_nsp(
-        type: Type,
-        obj: Any,
-
-    ) -> Any:
-        print(
-            f'{uid}: CUSTOM DECODE\n'
-            f'input type: {type}\n'
-            f'obj: {obj}\n'
-            f'type(obj): `{type(obj).__class__}`\n'
-        )
-        nsp = None
-
-        # This never seems to hit?
-        if isinstance(obj, Msg):
-            print(f'Msg type: {obj}')
-
-        if (
-            type is NamespacePath
-            and isinstance(obj, str)
-            and ':' in obj
-        ):
-            nsp = NamespacePath(obj)
-
-        if nsp:
-            print(f'Returning NSP instance: {nsp}')
-            return nsp
-
-        logmsg: str = (
-            f'{uid}: Decoding `{obj}: <{type(obj)}>` not supported'
-            f'input type: {type(obj)}\n'
-            f'obj: {obj}\n'
-            f'type(obj): `{type(obj).__class__}`\n'
-        )
-        print(logmsg)
-        raise NotImplementedError(logmsg)
-
-
     nsp_codec: MsgCodec = mk_codec(
-        ipc_pld_spec=pld_spec,
+        ipc_msg_spec=ipc_msg_spec,
-
+        enc_hook=enc_hook,
-        # NOTE XXX: the encode hook MUST be used no matter what since
+        dec_hook=dec_hook,
-        # our `NamespacePath` is not any of a `Any` native type nor
-        # a `msgspec.Struct` subtype - so `msgspec` has no way to know
-        # how to encode it unless we provide the custom hook.
-        #
-        # AGAIN that is, regardless of whether we spec an
-        # `Any`-decoded-pld the enc has no knowledge (by default)
-        # how to enc `NamespacePath` (nsp), so we add a custom
-        # hook to do that ALWAYS.
-        enc_hook=enc_nsp,
-
-        # XXX NOTE: pretty sure this is mutex with the `type=` to
-        # `Decoder`? so it won't work in tandem with the
-        # `ipc_pld_spec` passed above?
-        dec_hook=dec_nsp,
     )
+
+    # TODO: validate `MsgCodec` interface/semantics?
+    # -[ ] simple field tests to ensure caching + reset is workin?
+    # -[ ] custom / changing `.decoder()` calls?
+    #
+    # dec = nsp_codec.decoder(
+    #     types=NamespacePath,
+    # )
+    # assert nsp_codec.dec is dec
     return nsp_codec
 
 
 @tractor.context
 async def send_back_nsp(
-    ctx: Context,
+    ctx: tractor.Context,
-    expect_debug: bool,
-    use_any_spec: bool,
 
 ) -> None:
     '''
@@ -173,65 +117,28 @@ async def send_back_nsp(
     and ensure we can round trip a func ref with our parent.
 
     '''
-    # debug mode sanity check
+    task: trio.Task = trio.lowlevel.current_task()
-    assert expect_debug == _state.debug_mode()
+    task_ctx: Context = task.context
+    assert _ctxvar_MsgCodec not in task_ctx
 
-    # task: trio.Task = trio.lowlevel.current_task()
+    nsp_codec: MsgCodec = mk_custom_codec()
-
-    # TreeVar
-    # curr_codec = _ctxvar_MsgCodec.get_in(task)
-
-    # ContextVar
-    # task_ctx: Context = task.context
-    # assert _ctxvar_MsgCodec not in task_ctx
-
-    curr_codec = _ctxvar_MsgCodec.get()
-    assert curr_codec is _codec._def_tractor_codec
-
-    if use_any_spec:
-        pld_spec = Any
-    else:
-        # NOTE: don't need the |None here since
-        # the parent side will never send `None` like
-        # we do here in the implicit return at the end of this
-        # `@context` body.
-        pld_spec = NamespacePath  # |None
-
-    nsp_codec: MsgCodec = mk_custom_codec(
-        pld_spec=pld_spec,
-    )
     with apply_codec(nsp_codec) as codec:
         chk_codec_applied(
             custom_codec=nsp_codec,
             enter_value=codec,
         )
 
-        # ensure roundtripping works locally
         nsp = NamespacePath.from_ref(ex_func)
-        wire_bytes: bytes = nsp_codec.encode(
-            Started(
-                cid=ctx.cid,
-                pld=nsp
-            )
-        )
-        msg: Started = nsp_codec.decode(wire_bytes)
-        pld = msg.pld
-        assert pld == nsp
-
         await ctx.started(nsp)
+
         async with ctx.open_stream() as ipc:
             async for msg in ipc:
 
-                if use_any_spec:
                 assert msg == f'{__name__}:ex_func'
 
                 # TODO: as per below
                 # assert isinstance(msg, NamespacePath)
                 assert isinstance(msg, str)
-                else:
-                    assert isinstance(msg, NamespacePath)
-
-                await ipc.send(msg)
 
 
 def chk_codec_applied(
@@ -239,20 +146,11 @@ def chk_codec_applied(
     enter_value: MsgCodec,
 ) -> MsgCodec:
 
-    # task: trio.Task = trio.lowlevel.current_task()
+    task: trio.Task = trio.lowlevel.current_task()
+    task_ctx: Context = task.context
 
-    # TreeVar
+    assert _ctxvar_MsgCodec in task_ctx
-    # curr_codec = _ctxvar_MsgCodec.get_in(task)
+    curr_codec: MsgCodec = task.context[_ctxvar_MsgCodec]
-
-    # ContextVar
-    # task_ctx: Context = task.context
-    # assert _ctxvar_MsgCodec in task_ctx
-    # curr_codec: MsgCodec = task.context[_ctxvar_MsgCodec]
-
-    # RunVar
-    curr_codec: MsgCodec = _ctxvar_MsgCodec.get()
-    last_read_codec = _ctxvar_MsgCodec.get()
-    assert curr_codec is last_read_codec
 
     assert (
         # returned from `mk_codec()`
@@ -265,31 +163,14 @@ def chk_codec_applied(
         curr_codec is
 
         # public API for all of the above
-        current_codec()
+        current_msgspec_codec()
 
         # the default `msgspec` settings
-        is not _codec._def_msgspec_codec
+        is not _def_msgspec_codec
-        is not _codec._def_tractor_codec
     )
 
 
-@pytest.mark.parametrize(
+def test_codec_hooks_mod():
-    'ipc_pld_spec',
-    [
-        # _codec._def_msgspec_codec,
-        Any,
-        # _codec._def_tractor_codec,
-        NamespacePath|None,
-    ],
-    ids=[
-        'any_type',
-        'nsp_type',
-    ]
-)
-def test_codec_hooks_mod(
-    debug_mode: bool,
-    ipc_pld_spec: Union[Type]|Any,
-):
     '''
     Audit the `.msg.MsgCodec` override apis details given our impl
     uses `contextvars` to accomplish per `trio` task codec
@@ -297,21 +178,11 @@ def test_codec_hooks_mod(
 
     '''
     async def main():
+        task: trio.Task = trio.lowlevel.current_task()
+        task_ctx: Context = task.context
+        assert _ctxvar_MsgCodec not in task_ctx
 
-        # task: trio.Task = trio.lowlevel.current_task()
+        async with tractor.open_nursery() as an:
-
-        # ContextVar
-        # task_ctx: Context = task.context
-        # assert _ctxvar_MsgCodec not in task_ctx
-
-        # TreeVar
-        # def_codec: MsgCodec = _ctxvar_MsgCodec.get_in(task)
-        def_codec = _ctxvar_MsgCodec.get()
-        assert def_codec is _codec._def_tractor_codec
-
-        async with tractor.open_nursery(
-            debug_mode=debug_mode,
-        ) as an:
             p: tractor.Portal = await an.start_actor(
                 'sub',
                 enable_modules=[__name__],
@@ -321,9 +192,7 @@ def test_codec_hooks_mod(
             # - codec not modified -> decode nsp as `str`
             # - codec modified with hooks -> decode nsp as
             #   `NamespacePath`
-            nsp_codec: MsgCodec = mk_custom_codec(
+            nsp_codec: MsgCodec = mk_custom_codec()
-                pld_spec=ipc_pld_spec,
-            )
             with apply_codec(nsp_codec) as codec:
                 chk_codec_applied(
                     custom_codec=nsp_codec,
@@ -333,22 +202,9 @@ def test_codec_hooks_mod(
                 async with (
                     p.open_context(
                         send_back_nsp,
-                        # TODO: send the original nsp here and
-                        # test with `limit_msg_spec()` above?
-                        expect_debug=debug_mode,
-                        use_any_spec=(ipc_pld_spec==Any),
-
                     ) as (ctx, first),
                     ctx.open_stream() as ipc,
                 ):
-                    if ipc_pld_spec is NamespacePath:
-                        assert isinstance(first, NamespacePath)
-
-                    print(
-                        'root: ENTERING CONTEXT BLOCK\n'
-                        f'type(first): {type(first)}\n'
-                        f'first: {first}\n'
-                    )
                     # ensure codec is still applied across
                     # `tractor.Context` + its embedded nursery.
                     chk_codec_applied(
@@ -356,46 +212,23 @@ def test_codec_hooks_mod(
                         enter_value=codec,
                     )
 
-                    first_nsp = NamespacePath(first)
+                    assert first == f'{__name__}:ex_func'
-
-                    # ensure roundtripping works
-                    wire_bytes: bytes = nsp_codec.encode(
-                        Started(
-                            cid=ctx.cid,
-                            pld=first_nsp
-                        )
-                    )
-                    msg: Started = nsp_codec.decode(wire_bytes)
-                    pld = msg.pld
-                    assert  pld == first_nsp
-
-                    # try a manual decode of the started msg+pld
-
                     # TODO: actually get the decoder loading
                     # to native once we spec our SCIPP msgspec
                     # (structurred-conc-inter-proc-protocol)
                     # implemented as per,
                     # https://github.com/goodboy/tractor/issues/36
                     #
-                    if ipc_pld_spec is NamespacePath:
+                    # assert isinstance(first, NamespacePath)
-                        assert isinstance(first, NamespacePath)
-
-                    # `Any`-payload-spec case
-                    else:
                     assert isinstance(first, str)
-                        assert first == f'{__name__}:ex_func'
-
                     await ipc.send(first)
 
-                    with trio.move_on_after(.6):
+                    with trio.move_on_after(1):
                         async for msg in ipc:
-                            print(msg)
 
                             # TODO: as per above
                             # assert isinstance(msg, NamespacePath)
                             assert isinstance(msg, str)
-                            await ipc.send(msg)
-                            await trio.sleep(0.1)
 
             await p.cancel_actor()
 

tests/test_context_stream_semantics.py

@@ -845,10 +845,7 @@ async def keep_sending_from_callee(
         ('caller', 1, never_open_stream),
         ('callee', 0, keep_sending_from_callee),
     ],
-    ids=[
+    ids='overrun_condition={}'.format,
-         ('caller_1buf_never_open_stream'),
-         ('callee_0buf_keep_sending_from_callee'),
-    ]
 )
 def test_one_end_stream_not_opened(
     overrun_by: tuple[str, int, Callable],
@@ -872,7 +869,6 @@ def test_one_end_stream_not_opened(
                 enable_modules=[__name__],
             )
 
-            with trio.fail_after(1):
             async with portal.open_context(
                 entrypoint,
             ) as (ctx, sent):

tractor/devx/_debug.py

@@ -190,14 +190,11 @@ class Lock:
         is_trio_main = (
             # TODO: since this is private, @oremanj says
             # we should just copy the impl for now..
-            (is_main_thread := trio._util.is_main_thread())
+            trio._util.is_main_thread()
             and
             (async_lib := sniffio.current_async_library()) == 'trio'
         )
-        if (
+        if not is_trio_main:
-            not is_trio_main
-            and is_main_thread
-        ):
             log.warning(
                 f'Current async-lib detected by `sniffio`: {async_lib}\n'
             )

tractor/msg/__init__.py

@@ -31,24 +31,25 @@ from ._codec import (
     apply_codec as apply_codec,
     mk_codec as mk_codec,
     MsgCodec as MsgCodec,
-    current_codec as current_codec,
+    current_msgspec_codec as current_msgspec_codec,
 )
 
 from .types import (
     Msg as Msg,
 
-    Aid as Aid,
+    Start as Start,  # with pld
-    SpawnSpec as SpawnSpec,
+    FuncSpec as FuncSpec,
 
-    Start as Start,
+    StartAck as StartAck, # with pld
-    StartAck as StartAck,
+    IpcCtxSpec as IpcCtxSpec,
 
     Started as Started,
     Yield as Yield,
     Stop as Stop,
     Return as Return,
 
-    Error as Error,
+    Error as Error,  # with pld
+    ErrorData as ErrorData,
 
     # full msg spec set
     __spec__ as __spec__,

tractor/msg/_codec.py

@@ -30,13 +30,13 @@ ToDo: backends we prolly should offer:
 
 '''
 from __future__ import annotations
+from contextvars import (
+    ContextVar,
+    Token,
+)
 from contextlib import (
     contextmanager as cm,
 )
-# from contextvars import (
-#     ContextVar,
-#     Token,
-# )
 from typing import (
     Any,
     Callable,
@@ -47,12 +47,6 @@ from types import ModuleType
 
 import msgspec
 from msgspec import msgpack
-from trio.lowlevel import (
-    RunVar,
-    RunVarToken,
-)
-# TODO: see notes below from @mikenerone..
-# from tricycle import TreeVar
 
 from tractor.msg.pretty_struct import Struct
 from tractor.msg.types import (
@@ -78,9 +72,6 @@ class MsgCodec(Struct):
     '''
     A IPC msg interchange format lib's encoder + decoder pair.
 
-    Pretty much nothing more then delegation to underlying
-    `msgspec.<interchange-protocol>.Encoder/Decoder`s for now.
-
     '''
     _enc: msgpack.Encoder
     _dec: msgpack.Decoder
@@ -95,6 +86,11 @@ class MsgCodec(Struct):
 
     lib: ModuleType = msgspec
 
+    # ad-hoc type extensions
+    # https://jcristharif.com/msgspec/extending.html#mapping-to-from-native-types
+    enc_hook: Callable[[Any], Any]|None = None  # coder
+    dec_hook: Callable[[type, Any], Any]|None = None # decoder
+
     # TODO: a sub-decoder system as well?
     # payload_msg_specs: Union[Type[Struct]] = Any
     # see related comments in `.msg.types`
@@ -308,8 +304,7 @@ def mk_codec(
 
     libname: str = 'msgspec',
 
-    # proxy as `Struct(**kwargs)` for ad-hoc type extensions
+    # proxy as `Struct(**kwargs)`
-    # https://jcristharif.com/msgspec/extending.html#mapping-to-from-native-types
     # ------ - ------
     dec_hook: Callable|None = None,
     enc_hook: Callable|None = None,
@@ -394,52 +389,14 @@ def mk_codec(
 # no custom structs, hooks or other special types.
 _def_msgspec_codec: MsgCodec = mk_codec(ipc_msg_spec=Any)
 
-# The built-in IPC `Msg` spec.
+# NOTE: provides for per-`trio.Task` specificity of the
-# Our composing "shuttle" protocol which allows `tractor`-app code
-# to use any `msgspec` supported type as the `Msg.pld` payload,
-# https://jcristharif.com/msgspec/supported-types.html
-#
-_def_tractor_codec: MsgCodec = mk_codec(
-    ipc_pld_spec=Any,
-)
-# TODO: IDEALLY provides for per-`trio.Task` specificity of the
 # IPC msging codec used by the transport layer when doing
 # `Channel.send()/.recv()` of wire data.
-
+_ctxvar_MsgCodec: ContextVar[MsgCodec] = ContextVar(
-# ContextVar-TODO: DIDN'T WORK, kept resetting in every new task to default!?
-# _ctxvar_MsgCodec: ContextVar[MsgCodec] = ContextVar(
-
-# TreeVar-TODO: DIDN'T WORK, kept resetting in every new embedded nursery
-# even though it's supposed to inherit from a parent context ???
-#
-# _ctxvar_MsgCodec: TreeVar[MsgCodec] = TreeVar(
-#
-# ^-NOTE-^: for this to work see the mods by @mikenerone from `trio` gitter:
-#
-# 22:02:54 <mikenerone> even for regular contextvars, all you have to do is:
-#    `task: Task = trio.lowlevel.current_task()`
-#    `task.parent_nursery.parent_task.context.run(my_ctx_var.set, new_value)`
-#
-# From a comment in his prop code he couldn't share outright:
-# 1. For every TreeVar set in the current task (which covers what
-#    we need from SynchronizerFacade), walk up the tree until the
-#    root or finding one where the TreeVar is already set, setting
-#    it in all of the contexts along the way.
-# 2. For each of those, we also forcibly set the values that are
-#    pending for child nurseries that have not yet accessed the
-#    TreeVar.
-# 3. We similarly set the pending values for the child nurseries
-#    of the *current* task.
-#
-
-# TODO: STOP USING THIS, since it's basically a global and won't
-# allow sub-IPC-ctxs to limit the msg-spec however desired..
-_ctxvar_MsgCodec: MsgCodec = RunVar(
     'msgspec_codec',
 
     # TODO: move this to our new `Msg`-spec!
-    # default=_def_msgspec_codec,
+    default=_def_msgspec_codec,
-    default=_def_tractor_codec,
 )
 
 
@@ -453,36 +410,15 @@ def apply_codec(
     runtime context such that all IPC msgs are processed
     with it for that task.
 
-    Uses a `tricycle.TreeVar` to ensure the scope of the codec
-    matches the `@cm` block and DOES NOT change to the original
-    (default) value in new tasks (as it does for `ContextVar`).
-
-    See the docs:
-    - https://tricycle.readthedocs.io/en/latest/reference.html#tree-variables
-    - https://github.com/oremanj/tricycle/blob/master/tricycle/_tests/test_tree_var.py
-
     '''
-    orig: MsgCodec = _ctxvar_MsgCodec.get()
+    token: Token = _ctxvar_MsgCodec.set(codec)
-    assert orig is not codec
-    token: RunVarToken = _ctxvar_MsgCodec.set(codec)
-
-    # TODO: for TreeVar approach, see docs for @cm `.being()` API:
-    # https://tricycle.readthedocs.io/en/latest/reference.html#tree-variables
-    # try:
-    #     with _ctxvar_MsgCodec.being(codec):
-    #         new = _ctxvar_MsgCodec.get()
-    #         assert new is codec
-    #         yield codec
-
     try:
         yield _ctxvar_MsgCodec.get()
     finally:
         _ctxvar_MsgCodec.reset(token)
 
-    assert _ctxvar_MsgCodec.get() is orig
 
-
+def current_msgspec_codec() -> MsgCodec:
-def current_codec() -> MsgCodec:
     '''
     Return the current `trio.Task.context`'s value
     for `msgspec_codec` used by `Channel.send/.recv()`
@@ -513,6 +449,5 @@ def limit_msg_spec(
         payload_types=payload_types,
         **codec_kwargs,
     )
-    with apply_codec(msgspec_codec) as applied_codec:
+    with apply_codec(msgspec_codec):
-        assert applied_codec is msgspec_codec
         yield msgspec_codec

tractor/msg/pretty_struct.py

@@ -80,28 +80,6 @@ class DiffDump(UserList):
         return repstr
 
 
-def iter_fields(struct: Struct) -> Iterator[
-    tuple[
-        structs.FieldIinfo,
-        str,
-        Any,
-    ]
-]:
-    '''
-    Iterate over all non-@property fields of this struct.
-
-    '''
-    fi: structs.FieldInfo
-    for fi in structs.fields(struct):
-        key: str = fi.name
-        val: Any = getattr(struct, key)
-        yield (
-            fi,
-            key,
-            val,
-        )
-
-
 class Struct(
     _Struct,
 
@@ -113,6 +91,23 @@ class Struct(
     A "human friendlier" (aka repl buddy) struct subtype.
 
     '''
+    def _sin_props(self) -> Iterator[
+        tuple[
+            structs.FieldIinfo,
+            str,
+            Any,
+        ]
+    ]:
+        '''
+        Iterate over all non-@property fields of this struct.
+
+        '''
+        fi: structs.FieldInfo
+        for fi in structs.fields(self):
+            key: str = fi.name
+            val: Any = getattr(self, key)
+            yield fi, key, val
+
     def to_dict(
         self,
         include_non_members: bool = True,
@@ -135,7 +130,7 @@ class Struct(
         # added as type-defined `@property` methods!
         sin_props: dict = {}
         fi: structs.FieldInfo
-        for fi, k, v in iter_fields(self):
+        for fi, k, v in self._sin_props():
             sin_props[k] = asdict[k]
 
         return sin_props
@@ -164,7 +159,7 @@ class Struct(
         fi: structs.FieldInfo
         k: str
         v: Any
-        for fi, k, v in iter_fields(self):
+        for fi, k, v in self._sin_props():
 
             # TODO: how can we prefer `Literal['option1',  'option2,
             # ..]` over .__name__ == `Literal` but still get only the

tractor/msg/types.py

@@ -26,7 +26,6 @@ from __future__ import annotations
 import types
 from typing import (
     Any,
-    Callable,
     Generic,
     Literal,
     Type,
@@ -38,12 +37,8 @@ from msgspec import (
     defstruct,
     # field,
     Struct,
-    # UNSET,
+    UNSET,
-    # UnsetType,
+    UnsetType,
-)
-
-from tractor.msg import (
-    pretty_struct,
 )
 
 # type variable for the boxed payload field `.pld`
@@ -53,19 +48,11 @@ PayloadT = TypeVar('PayloadT')
 class Msg(
     Struct,
     Generic[PayloadT],
-
-    # https://jcristharif.com/msgspec/structs.html#tagged-unions
     tag=True,
     tag_field='msg_type',
 
-    # https://jcristharif.com/msgspec/structs.html#field-ordering
+    # eq=True,
-    # kw_only=True,
-
-    # https://jcristharif.com/msgspec/structs.html#equality-and-order
     # order=True,
-
-    # https://jcristharif.com/msgspec/structs.html#encoding-decoding-as-arrays
-    # as_array=True,
 ):
     '''
     The "god" boxing msg type.
@@ -103,53 +90,6 @@ class Msg(
     pld: PayloadT
 
 
-class Aid(
-    Struct,
-    tag=True,
-    tag_field='msg_type',
-):
-    '''
-    Actor-identity msg.
-
-    Initial contact exchange enabling an actor "mailbox handshake"
-    delivering the peer identity (and maybe eventually contact)
-    info.
-
-    Used by discovery protocol to register actors as well as
-    conduct the initial comms (capability) filtering.
-
-    '''
-    name: str
-    uuid: str
-    # TODO: use built-in support for UUIDs?
-    # -[ ] `uuid.UUID` which has multi-protocol support
-    #  https://jcristharif.com/msgspec/supported-types.html#uuid
-
-
-class SpawnSpec(
-    pretty_struct.Struct,
-    tag=True,
-    tag_field='msg_type',
-):
-    '''
-    Initial runtime spec handed down from a spawning parent to its
-    child subactor immediately following first contact via an
-    `Aid` msg.
-
-    '''
-    _parent_main_data: dict
-    _runtime_vars: dict[str, Any]
-
-    # module import capability
-    enable_modules: dict[str, str]
-
-    # TODO: not just sockaddr pairs?
-    # -[ ] abstract into a `TransportAddr` type?
-    reg_addrs: list[tuple[str, int]]
-    bind_addrs: list[tuple[str, int]]
-
-
-
 # TODO: caps based RPC support in the payload?
 #
 # -[ ] integration with our ``enable_modules: list[str]`` caps sys.
@@ -165,31 +105,18 @@ class SpawnSpec(
 #
 # -[ ] can we combine .ns + .func into a native `NamespacePath` field?
 #
-# -[ ] better name, like `Call/TaskInput`?
+# -[ ]better name, like `Call/TaskInput`?
 #
-# -[ ] XXX a debugger lock msg transaction with payloads like,
+class FuncSpec(Struct):
-#   child -> `.pld: DebugLock` -> root
+    ns: str
-#   child <- `.pld: DebugLocked` <- root
+    func: str
-#   child -> `.pld: DebugRelease` -> root
+
-#
+    kwargs: dict
-#   WHY => when a pld spec is provided it might not allow for
+    uid: str  # (calling) actor-id
-#   debug mode msgs as they currently are (using plain old `pld.
-#   str` payloads) so we only when debug_mode=True we need to
-#   union in this debugger payload set?
-#
-#   mk_msg_spec(
-#       MyPldSpec,
-#       debug_mode=True,
-#   ) -> (
-#       Union[MyPldSpec]
-#      | Union[DebugLock, DebugLocked, DebugRelease]
-#   )
 
 
 class Start(
-    Struct,
+    Msg,
-    tag=True,
-    tag_field='msg_type',
 ):
     '''
     Initial request to remotely schedule an RPC `trio.Task` via
@@ -207,26 +134,14 @@ class Start(
     - `Context.open_context()`
 
     '''
-    cid: str
+    pld: FuncSpec
-
-    ns: str
-    func: str
-
-    kwargs: dict
-    uid: tuple[str, str]  # (calling) actor-id
 
 
-class StartAck(
+class IpcCtxSpec(Struct):
-    Struct,
-    tag=True,
-    tag_field='msg_type',
-):
     '''
-    Init response to a `Cmd` request indicating the far
+    An inter-actor-`trio.Task`-comms `Context` spec.
-    end's RPC spec, namely its callable "type".
 
     '''
-    cid: str
     # TODO: maybe better names for all these?
     # -[ ] obvi ^ would need sync with `._rpc`
     functype: Literal[
@@ -245,6 +160,18 @@ class StartAck(
     # msgspec: MsgSpec
 
 
+class StartAck(
+    Msg,
+    Generic[PayloadT],
+):
+    '''
+    Init response to a `Cmd` request indicating the far
+    end's RPC callable "type".
+
+    '''
+    pld: IpcCtxSpec
+
+
 class Started(
     Msg,
     Generic[PayloadT],
@@ -275,19 +202,13 @@ class Yield(
     pld: PayloadT
 
 
-class Stop(
+class Stop(Msg):
-    Struct,
-    tag=True,
-    tag_field='msg_type',
-):
     '''
     Stream termination signal much like an IPC version 
     of `StopAsyncIteration`.
 
     '''
-    cid: str
+    pld: UnsetType = UNSET
-    # TODO: do we want to support a payload on stop?
-    # pld: UnsetType = UNSET
 
 
 class Return(
@@ -302,33 +223,32 @@ class Return(
     pld: PayloadT
 
 
-class Error(
+class ErrorData(Struct):
-    Struct,
-    tag=True,
-    tag_field='msg_type',
-):
     '''
-    A pkt that wraps `RemoteActorError`s for relay and raising.
+    Remote actor error meta-data as needed originally by
-
-    Fields are 1-to-1 meta-data as needed originally by
     `RemoteActorError.msgdata: dict`.
 
     '''
-    src_uid: tuple[str, str]
+    src_uid: str
     src_type_str: str
     boxed_type_str: str
-    relay_path: list[tuple[str, str]]
+
+    relay_path: list[str]
     tb_str: str
 
-    cid: str|None = None
-
-    # TODO: use UNSET or don't include them via
-    #
     # `ContextCancelled`
-    canceller: tuple[str, str]|None = None
+    canceller: str|None = None
 
     # `StreamOverrun`
-    sender: tuple[str, str]|None = None
+    sender: str|None = None
+
+
+class Error(Msg):
+    '''
+    A pkt that wraps `RemoteActorError`s for relay.
+
+    '''
+    pld: ErrorData
 
 
 # TODO: should be make a msg version of `ContextCancelled?`
@@ -345,12 +265,6 @@ class Error(
 # approx order of the IPC txn-state spaces.
 __spec__: list[Msg] = [
 
-    # identity handshake
-    Aid,
-
-    # spawn specification from parent
-    SpawnSpec,
-
     # inter-actor RPC initiation
     Start,
     StartAck,
@@ -366,8 +280,6 @@ __spec__: list[Msg] = [
 ]
 
 _runtime_spec_msgs: list[Msg] = [
-    Aid,
-    SpawnSpec,
     Start,
     StartAck,
     Stop,
@@ -531,99 +443,3 @@ def mk_msg_spec(
         pld_spec | runtime_spec,
         msgtypes_table[spec_build_method] + ipc_msg_types,
     )
-
-
-# TODO: make something similar to this inside `._codec` such that
-# user can just pass a type table of some sort?
-# def mk_dict_msg_codec_hooks() -> tuple[Callable, Callable]:
-#     '''
-#     Deliver a `enc_hook()`/`dec_hook()` pair which does
-#     manual convertion from our above native `Msg` set
-#     to `dict` equivalent (wire msgs) in order to keep legacy compat
-#     with the original runtime implementation.
-
-#     Note: this is is/was primarly used while moving the core
-#     runtime over to using native `Msg`-struct types wherein we
-#     start with the send side emitting without loading
-#     a typed-decoder and then later flipping the switch over to
-#     load to the native struct types once all runtime usage has
-#     been adjusted appropriately.
-
-#     '''
-#     def enc_to_dict(msg: Any) -> Any:
-#         '''
-#         Encode `Msg`-structs to `dict` msgs instead
-#         of using `msgspec.msgpack.Decoder.type`-ed
-#         features.
-
-#         '''
-#         match msg:
-#             case Start():
-#                 dctmsg: dict = pretty_struct.Struct.to_dict(
-#                     msg
-#                 )['pld']
-
-#             case Error():
-#                 dctmsg: dict = pretty_struct.Struct.to_dict(
-#                     msg
-#                 )['pld']
-#                 return {'error': dctmsg}
-
-
-#     def dec_from_dict(
-#         type: Type,
-#         obj: Any,
-#     ) -> Any:
-#         '''
-#         Decode to `Msg`-structs from `dict` msgs instead
-#         of using `msgspec.msgpack.Decoder.type`-ed
-#         features.
-
-#         '''
-#         cid: str = obj.get('cid')
-#         match obj:
-#             case {'cmd': pld}:
-#                 return Start(
-#                     cid=cid,
-#                     pld=pld,
-#                 )
-#             case {'functype': pld}:
-#                 return StartAck(
-#                     cid=cid,
-#                     functype=pld,
-#                     # pld=IpcCtxSpec(
-#                     #     functype=pld,
-#                     # ),
-#                 )
-#             case {'started': pld}:
-#                 return Started(
-#                     cid=cid,
-#                     pld=pld,
-#                 )
-#             case {'yield': pld}:
-#                 return Yield(
-#                     cid=obj['cid'],
-#                     pld=pld,
-#                 )
-#             case {'stop': pld}:
-#                 return Stop(
-#                     cid=cid,
-#                 )
-#             case {'return': pld}:
-#                 return Return(
-#                     cid=cid,
-#                     pld=pld,
-#                 )
-
-#             case {'error': pld}:
-#                 return Error(
-#                     cid=cid,
-#                     pld=ErrorData(
-#                         **pld
-#                     ),
-#                 )
-
-#     return (
-#         # enc_to_dict,
-#         dec_from_dict,
-#     )