Allocate bind-addrs in subactors

Previously whenever an `ActorNursery.start_actor()` call did not receive
a `bind_addrs` arg we would allocate the default `(localhost, 0)` pairs
in the parent, for UDS this obviously won't work nor is it ideal bc it's
nicer to have the actor to be a socket server (who calls
`Address.open_listener()`) define the socket-file-name containing their
unique ID info such as pid, actor-uuid etc.

As such this moves "random" generation of server addresses to the
child-side of a subactor's spawn-sequence when it's sin-`bind_addrs`;
i.e. we do the allocation of the `Address.get_random()` addrs inside
`._runtime.async_main()` instead of `Portal.start_actor()` and **only
when** `accept_addrs`/`bind_addrs` was **not provided by the spawning
parent**.

Further this patch get's way more rigorous about the `SpawnSpec`
processing in the child inside `Actor._from_parent()` such that we
handle any invalid msgs **very loudly and pedantically!**

Impl deats,
- do the "random addr generation" in an explicit `for` loop (instead of
  prior comprehension) to allow for more detailed typing of the layered
  calls to the new `._addr` mod.
- use a `match:/case:` for process any invalid `SpawnSpec` payload case
  where we can instead receive a `MsgTypeError` from the `chan.recv()`
  call in `Actor._from_parent()` to raise it immediately instead of
  triggering downstream type-errors XD
  |_ as per the big `#TODO` we prolly want to take from other callers
     of `Channel.recv()` (like in the `._rpc.process_messages()` loop).
  |_ always raise `InternalError` on non-match/fall-through case!
  |_ add a note about not being able to use `breakpoint()` in this
     section due to causality of `SpawnSpec._runtime_vars` not having
     been processed yet..
  |_ always return a third element from `._from_rent()` eventually to be
     the `preferred_transports: list[str]` from the spawning rent.
- use new `._addr.mk_uuid()` and pass to new `Actor.__init__(uuid: str)`
  for all actor creation (including in all the mods tweaked here).
- Move to new type-alias-name `UnwrappedAddress` throughout.

tractor/_discovery.py

@@ -31,7 +31,7 @@ from tractor.log import get_logger
 from .trionics import gather_contexts
 from .ipc import _connect_chan, Channel
 from ._addr import (
-    AddressTypes,
+    UnwrappedAddress,
     Address,
     preferred_transport,
     wrap_address
@@ -54,7 +54,9 @@ log = get_logger(__name__)
 
 
 @acm
-async def get_registry(addr: AddressTypes | None = None) -> AsyncGenerator[
+async def get_registry(
+    addr: UnwrappedAddress|None = None,
+) -> AsyncGenerator[
     Portal | LocalPortal | None,
     None,
 ]:
@@ -71,7 +73,9 @@ async def get_registry(addr: AddressTypes | None = None) -> AsyncGenerator[
         # (likely a re-entrant call from the arbiter actor)
         yield LocalPortal(
             actor,
-            await Channel.from_addr(addr)
+            Channel(transport=None)
+            # ^XXX, we DO NOT actually provide nor connect an
+            # underlying transport since this is merely an API shim.
         )
     else:
         # TODO: try to look pre-existing connection from
@@ -135,10 +139,10 @@ def get_peer_by_name(
 @acm
 async def query_actor(
     name: str,
-    regaddr: AddressTypes|None = None,
+    regaddr: UnwrappedAddress|None = None,
 
 ) -> AsyncGenerator[
-    AddressTypes|None,
+    UnwrappedAddress|None,
     None,
 ]:
     '''
@@ -168,7 +172,7 @@ async def query_actor(
     async with get_registry(regaddr) as reg_portal:
         # TODO: return portals to all available actors - for now
         # just the last one that registered
-        addr: AddressTypes = await reg_portal.run_from_ns(
+        addr: UnwrappedAddress = await reg_portal.run_from_ns(
             'self',
             'find_actor',
             name=name,
@@ -178,7 +182,7 @@ async def query_actor(
 
 @acm
 async def maybe_open_portal(
-    addr: AddressTypes,
+    addr: UnwrappedAddress,
     name: str,
 ):
     async with query_actor(
@@ -198,7 +202,7 @@ async def maybe_open_portal(
 @acm
 async def find_actor(
     name: str,
-    registry_addrs: list[AddressTypes]|None = None,
+    registry_addrs: list[UnwrappedAddress]|None = None,
     enable_transports: list[str] = [preferred_transport],
 
     only_first: bool = True,
@@ -234,7 +238,7 @@ async def find_actor(
         )
 
     maybe_portals: list[
-        AsyncContextManager[AddressTypes]
+        AsyncContextManager[UnwrappedAddress]
     ] = list(
         maybe_open_portal(
             addr=addr,
@@ -276,7 +280,7 @@ async def find_actor(
 @acm
 async def wait_for_actor(
     name: str,
-    registry_addr: AddressTypes | None = None,
+    registry_addr: UnwrappedAddress | None = None,
 
 ) -> AsyncGenerator[Portal, None]:
     '''
@@ -293,7 +297,7 @@ async def wait_for_actor(
             yield peer_portal
             return
 
-    regaddr: AddressTypes = (
+    regaddr: UnwrappedAddress = (
         registry_addr
         or
         actor.reg_addrs[0]
@@ -310,7 +314,7 @@ async def wait_for_actor(
 
         # get latest registered addr by default?
         # TODO: offer multi-portal yields in multi-homed case?
-        addr: AddressTypes = addrs[-1]
+        addr: UnwrappedAddress = addrs[-1]
 
         async with _connect_chan(addr) as chan:
             async with open_portal(chan) as portal:

tractor/_entry.py

@@ -37,7 +37,7 @@ from .log import (
 from . import _state
 from .devx import _debug
 from .to_asyncio import run_as_asyncio_guest
-from ._addr import AddressTypes
+from ._addr import UnwrappedAddress
 from ._runtime import (
     async_main,
     Actor,
@@ -53,10 +53,10 @@ log = get_logger(__name__)
 def _mp_main(
 
     actor: Actor,
-    accept_addrs: list[AddressTypes],
+    accept_addrs: list[UnwrappedAddress],
     forkserver_info: tuple[Any, Any, Any, Any, Any],
     start_method: SpawnMethodKey,
-    parent_addr: AddressTypes | None = None,
+    parent_addr: UnwrappedAddress | None = None,
     infect_asyncio: bool = False,
 
 ) -> None:
@@ -207,7 +207,7 @@ def nest_from_op(
 def _trio_main(
     actor: Actor,
     *,
-    parent_addr: AddressTypes | None = None,
+    parent_addr: UnwrappedAddress|None = None,
     infect_asyncio: bool = False,
 
 ) -> None:

tractor/_root.py

@@ -47,10 +47,11 @@ from .ipc import (
     _connect_chan,
 )
 from ._addr import (
-    AddressTypes,
+    UnwrappedAddress,
-    wrap_address,
+    default_lo_addrs,
+    mk_uuid,
     preferred_transport,
-    default_lo_addrs
+    wrap_address,
 )
 from ._exceptions import is_multi_cancelled
 
@@ -63,10 +64,10 @@ async def open_root_actor(
 
     *,
     # defaults are above
-    registry_addrs: list[AddressTypes]|None = None,
+    registry_addrs: list[UnwrappedAddress]|None = None,
 
     # defaults are above
-    arbiter_addr: tuple[AddressTypes]|None = None,
+    arbiter_addr: tuple[UnwrappedAddress]|None = None,
 
     enable_transports: list[str] = [preferred_transport],
 
@@ -195,7 +196,9 @@ async def open_root_actor(
         registry_addrs = [arbiter_addr]
 
     if not registry_addrs:
-        registry_addrs: list[AddressTypes] = default_lo_addrs(enable_transports)
+        registry_addrs: list[UnwrappedAddress] = default_lo_addrs(
+            enable_transports
+        )
 
     assert registry_addrs
 
@@ -245,10 +248,10 @@ async def open_root_actor(
         enable_stack_on_sig()
 
     # closed into below ping task-func
-    ponged_addrs: list[AddressTypes] = []
+    ponged_addrs: list[UnwrappedAddress] = []
 
     async def ping_tpt_socket(
-        addr: AddressTypes,
+        addr: UnwrappedAddress,
         timeout: float = 1,
     ) -> None:
         '''
@@ -284,7 +287,7 @@ async def open_root_actor(
                 addr,
             )
 
-    trans_bind_addrs: list[AddressTypes] = []
+    trans_bind_addrs: list[UnwrappedAddress] = []
 
     # Create a new local root-actor instance which IS NOT THE
     # REGISTRAR
@@ -302,6 +305,7 @@ async def open_root_actor(
 
         actor = Actor(
             name=name or 'anonymous',
+            uuid=mk_uuid(),
             registry_addrs=ponged_addrs,
             loglevel=loglevel,
             enable_modules=enable_modules,
@@ -336,7 +340,8 @@ async def open_root_actor(
         # https://github.com/goodboy/tractor/issues/296
 
         actor = Arbiter(
-            name or 'registrar',
+            name=name or 'registrar',
+            uuid=mk_uuid(),
             registry_addrs=registry_addrs,
             loglevel=loglevel,
             enable_modules=enable_modules,
@@ -462,7 +467,7 @@ def run_daemon(
 
     # runtime kwargs
     name: str | None = 'root',
-    registry_addrs: list[AddressTypes]|None = None,
+    registry_addrs: list[UnwrappedAddress]|None = None,
 
     start_method: str | None = None,
     debug_mode: bool = False,

tractor/_runtime.py

@@ -52,6 +52,7 @@ import sys
 from typing import (
     Any,
     Callable,
+    Type,
     TYPE_CHECKING,
 )
 import uuid
@@ -75,11 +76,12 @@ from tractor.msg import (
 )
 from .ipc import Channel
 from ._addr import (
-    AddressTypes,
+    UnwrappedAddress,
     Address,
-    wrap_address,
+    default_lo_addrs,
+    get_address_cls,
     preferred_transport,
-    default_lo_addrs
+    wrap_address,
 )
 from ._context import (
     mk_context,
@@ -182,15 +184,15 @@ class Actor:
     def __init__(
         self,
         name: str,
+        uuid: str,
         *,
         enable_modules: list[str] = [],
-        uid: str|None = None,
         loglevel: str|None = None,
-        registry_addrs: list[AddressTypes]|None = None,
+        registry_addrs: list[UnwrappedAddress]|None = None,
         spawn_method: str|None = None,
 
         # TODO: remove!
-        arbiter_addr: AddressTypes|None = None,
+        arbiter_addr: UnwrappedAddress|None = None,
 
     ) -> None:
         '''
@@ -199,10 +201,7 @@ class Actor:
 
         '''
         self.name = name
-        self.uid = (
+        self.uid = (name, uuid)
-            name,
-            uid or str(uuid.uuid4())
-        )
 
         self._cancel_complete = trio.Event()
         self._cancel_called_by_remote: tuple[str, tuple]|None = None
@@ -230,7 +229,7 @@ class Actor:
                 DeprecationWarning,
                 stacklevel=2,
             )
-            registry_addrs: list[AddressTypes] = [arbiter_addr]
+            registry_addrs: list[UnwrappedAddress] = [arbiter_addr]
 
         # marked by the process spawning backend at startup
         # will be None for the parent most process started manually
@@ -277,13 +276,13 @@ class Actor:
 
         # when provided, init the registry addresses property from
         # input via the validator.
-        self._reg_addrs: list[AddressTypes] = []
+        self._reg_addrs: list[UnwrappedAddress] = []
         if registry_addrs:
-            self.reg_addrs: list[AddressTypes] = registry_addrs
+            self.reg_addrs: list[UnwrappedAddress] = registry_addrs
             _state._runtime_vars['_registry_addrs'] = registry_addrs
 
     @property
-    def reg_addrs(self) -> list[AddressTypes]:
+    def reg_addrs(self) -> list[UnwrappedAddress]:
         '''
         List of (socket) addresses for all known (and contactable)
         registry actors.
@@ -294,7 +293,7 @@ class Actor:
     @reg_addrs.setter
     def reg_addrs(
         self,
-        addrs: list[AddressTypes],
+        addrs: list[UnwrappedAddress],
     ) -> None:
         if not addrs:
             log.warning(
@@ -1023,11 +1022,12 @@ class Actor:
 
     async def _from_parent(
         self,
-        parent_addr: AddressTypes|None,
+        parent_addr: UnwrappedAddress|None,
 
     ) -> tuple[
         Channel,
-        list[AddressTypes]|None,
+        list[UnwrappedAddress]|None,
+        list[str]|None,  # preferred tpts
     ]:
         '''
         Bootstrap this local actor's runtime config from its parent by
@@ -1039,30 +1039,58 @@ class Actor:
             # Connect back to the parent actor and conduct initial
             # handshake. From this point on if we error, we
             # attempt to ship the exception back to the parent.
-            chan = await Channel.from_addr(wrap_address(parent_addr))
+            chan = await Channel.from_addr(
+                addr=wrap_address(parent_addr)
+            )
+            assert isinstance(chan, Channel)
 
             # TODO: move this into a `Channel.handshake()`?
             # Initial handshake: swap names.
             await self._do_handshake(chan)
 
-            accept_addrs: list[AddressTypes]|None = None
+            accept_addrs: list[UnwrappedAddress]|None = None
 
             if self._spawn_method == "trio":
 
                 # Receive post-spawn runtime state from our parent.
                 spawnspec: msgtypes.SpawnSpec = await chan.recv()
-                self._spawn_spec = spawnspec
+                match spawnspec:
+                    case MsgTypeError():
+                        raise spawnspec
+                    case msgtypes.SpawnSpec():
+                        self._spawn_spec = spawnspec
+                        log.runtime(
+                            'Received runtime spec from parent:\n\n'
 
-                log.runtime(
+                            # TODO: eventually all these msgs as
-                    'Received runtime spec from parent:\n\n'
+                            # `msgspec.Struct` with a special mode that
+                            # pformats them in multi-line mode, BUT only
+                            # if "trace"/"util" mode is enabled?
+                            f'{pretty_struct.pformat(spawnspec)}\n'
+                        )
 
-                    # TODO: eventually all these msgs as
+                    case _:
-                    # `msgspec.Struct` with a special mode that
+                        raise InternalError(
-                    # pformats them in multi-line mode, BUT only
+                            f'Received invalid non-`SpawnSpec` payload !?\n'
-                    # if "trace"/"util" mode is enabled?
+                            f'{spawnspec}\n'
-                    f'{pretty_struct.pformat(spawnspec)}\n'
+                        )
-                )
+
-                accept_addrs: list[AddressTypes] = spawnspec.bind_addrs
+                # ^^TODO XXX!! when the `SpawnSpec` fails to decode
+                # the above will raise a `MsgTypeError` which if we
+                # do NOT ALSO RAISE it will tried to be pprinted in
+                # the log.runtime() below..
+                #
+                # SO we gotta look at how other `chan.recv()` calls
+                # are wrapped and do the same for this spec receive!
+                # -[ ] see `._rpc` likely has the answer?
+                #
+                # XXX NOTE, can't be called here in subactor
+                # bc we haven't yet received the
+                # `SpawnSpec._runtime_vars: dict` which would
+                # declare whether `debug_mode` is set!
+                # breakpoint()
+                # import pdbp; pdbp.set_trace()
+                accept_addrs: list[UnwrappedAddress] = spawnspec.bind_addrs
 
                 # TODO: another `Struct` for rtvs..
                 rvs: dict[str, Any] = spawnspec._runtime_vars
@@ -1154,6 +1182,9 @@ class Actor:
             return (
                 chan,
                 accept_addrs,
+                None,
+                # ^TODO, preferred tpts list from rent!
+                # -[ ] need to extend the `SpawnSpec` tho!
             )
 
         except OSError:  # failed to connect
@@ -1169,7 +1200,7 @@ class Actor:
         self,
         handler_nursery: Nursery,
         *,
-        listen_addrs: list[AddressTypes]|None = None,
+        listen_addrs: list[UnwrappedAddress]|None = None,
 
         task_status: TaskStatus[Nursery] = trio.TASK_STATUS_IGNORED,
     ) -> None:
@@ -1578,7 +1609,7 @@ class Actor:
         return False
 
     @property
-    def accept_addrs(self) -> list[AddressTypes]:
+    def accept_addrs(self) -> list[UnwrappedAddress]:
         '''
         All addresses to which the transport-channel server binds
         and listens for new connections.
@@ -1587,7 +1618,7 @@ class Actor:
         return [a.unwrap() for a in self._listen_addrs]
 
     @property
-    def accept_addr(self) -> AddressTypes:
+    def accept_addr(self) -> UnwrappedAddress:
         '''
         Primary address to which the IPC transport server is
         bound and listening for new connections.
@@ -1639,8 +1670,6 @@ class Actor:
         chan.aid = aid
 
         uid: tuple[str, str] = (
-            # str(value[0]),
-            # str(value[1])
             aid.name,
             aid.uuid,
         )
@@ -1664,7 +1693,7 @@ class Actor:
 
 async def async_main(
     actor: Actor,
-    accept_addrs: AddressTypes|None = None,
+    accept_addrs: UnwrappedAddress|None = None,
 
     # XXX: currently ``parent_addr`` is only needed for the
     # ``multiprocessing`` backend (which pickles state sent to
@@ -1673,7 +1702,7 @@ async def async_main(
     # change this to a simple ``is_subactor: bool`` which will
     # be False when running as root actor and True when as
     # a subactor.
-    parent_addr: AddressTypes|None = None,
+    parent_addr: UnwrappedAddress|None = None,
     task_status: TaskStatus[None] = trio.TASK_STATUS_IGNORED,
 
 ) -> None:
@@ -1702,16 +1731,31 @@ async def async_main(
             (
                 actor._parent_chan,
                 set_accept_addr_says_rent,
+                maybe_preferred_transports_says_rent,
             ) = await actor._from_parent(parent_addr)
 
+
             # either it's passed in because we're not a child or
             # because we're running in mp mode
+            accept_addrs: list[UnwrappedAddress] = []
             if (
                 set_accept_addr_says_rent
                 and
                 set_accept_addr_says_rent is not None
             ):
                 accept_addrs = set_accept_addr_says_rent
+            else:
+                enable_transports: list[str] = (
+                    maybe_preferred_transports_says_rent
+                    or
+                    [preferred_transport]
+                )
+                for transport_key in enable_transports:
+                    transport_cls: Type[Address] = get_address_cls(
+                        transport_key
+                    )
+                    addr: Address = transport_cls.get_random()
+                    accept_addrs.append(addr.unwrap())
 
         # The "root" nursery ensures the channel with the immediate
         # parent is kept alive as a resilient service until
@@ -1779,7 +1823,7 @@ async def async_main(
 
                     raise
 
-                accept_addrs: list[AddressTypes] = actor.accept_addrs
+                accept_addrs: list[UnwrappedAddress] = actor.accept_addrs
 
                 # NOTE: only set the loopback addr for the 
                 # process-tree-global "root" mailbox since
@@ -2028,7 +2072,7 @@ class Arbiter(Actor):
 
         self._registry: dict[
             tuple[str, str],
-            AddressTypes,
+            UnwrappedAddress,
         ] = {}
         self._waiters: dict[
             str,
@@ -2044,7 +2088,7 @@ class Arbiter(Actor):
         self,
         name: str,
 
-    ) -> AddressTypes|None:
+    ) -> UnwrappedAddress|None:
 
         for uid, addr in self._registry.items():
             if name in uid:
@@ -2055,7 +2099,7 @@ class Arbiter(Actor):
     async def get_registry(
         self
 
-    ) -> dict[str, AddressTypes]:
+    ) -> dict[str, UnwrappedAddress]:
         '''
         Return current name registry.
 
@@ -2075,7 +2119,7 @@ class Arbiter(Actor):
         self,
         name: str,
 
-    ) -> list[AddressTypes]:
+    ) -> list[UnwrappedAddress]:
         '''
         Wait for a particular actor to register.
 
@@ -2083,8 +2127,8 @@ class Arbiter(Actor):
         registered.
 
         '''
-        addrs: list[AddressTypes] = []
+        addrs: list[UnwrappedAddress] = []
-        addr: AddressTypes
+        addr: UnwrappedAddress
 
         mailbox_info: str = 'Actor registry contact infos:\n'
         for uid, addr in self._registry.items():
@@ -2110,7 +2154,7 @@ class Arbiter(Actor):
     async def register_actor(
         self,
         uid: tuple[str, str],
-        addr: AddressTypes
+        addr: UnwrappedAddress
     ) -> None:
         uid = name, hash = (str(uid[0]), str(uid[1]))
         waddr: Address = wrap_address(addr)

tractor/_spawn.py

@@ -46,7 +46,7 @@ from tractor._state import (
     _runtime_vars,
 )
 from tractor.log import get_logger
-from tractor._addr import AddressTypes
+from tractor._addr import UnwrappedAddress
 from tractor._portal import Portal
 from tractor._runtime import Actor
 from tractor._entry import _mp_main
@@ -393,8 +393,8 @@ async def new_proc(
     errors: dict[tuple[str, str], Exception],
 
     # passed through to actor main
-    bind_addrs: list[AddressTypes],
+    bind_addrs: list[UnwrappedAddress],
-    parent_addr: AddressTypes,
+    parent_addr: UnwrappedAddress,
     _runtime_vars: dict[str, Any],  # serialized and sent to _child
 
     *,
@@ -432,8 +432,8 @@ async def trio_proc(
     errors: dict[tuple[str, str], Exception],
 
     # passed through to actor main
-    bind_addrs: list[AddressTypes],
+    bind_addrs: list[UnwrappedAddress],
-    parent_addr: AddressTypes,
+    parent_addr: UnwrappedAddress,
     _runtime_vars: dict[str, Any],  # serialized and sent to _child
     *,
     infect_asyncio: bool = False,
@@ -639,8 +639,8 @@ async def mp_proc(
     subactor: Actor,
     errors: dict[tuple[str, str], Exception],
     # passed through to actor main
-    bind_addrs: list[AddressTypes],
+    bind_addrs: list[UnwrappedAddress],
-    parent_addr: AddressTypes,
+    parent_addr: UnwrappedAddress,
     _runtime_vars: dict[str, Any],  # serialized and sent to _child
     *,
     infect_asyncio: bool = False,

tractor/_supervise.py

@@ -22,7 +22,9 @@ from contextlib import asynccontextmanager as acm
 from functools import partial
 import inspect
 from pprint import pformat
-from typing import TYPE_CHECKING
+from typing import (
+    TYPE_CHECKING,
+)
 import typing
 import warnings
 
@@ -31,9 +33,9 @@ import trio
 
 from .devx._debug import maybe_wait_for_debugger
 from ._addr import (
-    AddressTypes,
+    UnwrappedAddress,
     preferred_transport,
-    get_address_cls
+    mk_uuid,
 )
 from ._state import current_actor, is_main_process
 from .log import get_logger, get_loglevel
@@ -134,7 +136,7 @@ class ActorNursery:
 
         *,
 
-        bind_addrs: list[AddressTypes]|None = None,
+        bind_addrs: list[UnwrappedAddress]|None = None,
         rpc_module_paths: list[str]|None = None,
         enable_transports: list[str] = [preferred_transport],
         enable_modules: list[str]|None = None,
@@ -161,12 +163,6 @@ class ActorNursery:
             or get_loglevel()
         )
 
-        if not bind_addrs:
-            bind_addrs: list[AddressTypes] = [
-                get_address_cls(transport).get_random().unwrap()
-                for transport in enable_transports
-            ]
-
         # configure and pass runtime state
         _rtv = _state._runtime_vars.copy()
         _rtv['_is_root'] = False
@@ -189,7 +185,9 @@ class ActorNursery:
             enable_modules.extend(rpc_module_paths)
 
         subactor = Actor(
-            name,
+            name=name,
+            uuid=mk_uuid(),
+
             # modules allowed to invoked funcs from
             enable_modules=enable_modules,
             loglevel=loglevel,
@@ -197,7 +195,7 @@ class ActorNursery:
             # verbatim relay this actor's registrar addresses
             registry_addrs=current_actor().reg_addrs,
         )
-        parent_addr = self._actor.accept_addr
+        parent_addr: UnwrappedAddress = self._actor.accept_addr
         assert parent_addr
 
         # start a task to spawn a process
@@ -235,7 +233,7 @@ class ActorNursery:
         *,
 
         name: str | None = None,
-        bind_addrs: AddressTypes|None = None,
+        bind_addrs: UnwrappedAddress|None = None,
         rpc_module_paths: list[str] | None = None,
         enable_modules: list[str] | None = None,
         loglevel: str | None = None,  # set log level per subactor

tractor/ipc/_tcp.py

@@ -42,24 +42,15 @@ class MsgpackTCPStream(MsgpackTransport):
     address_type = TCPAddress
     layer_key: int = 4
 
-    # def __init__(
-    #     self,
-    #     stream: trio.SocketStream,
-    #     prefix_size: int = 4,
-    #     codec: CodecType = None,
-
-    # ) -> None:
-    #     super().__init__(
-    #         stream,
-    #         prefix_size=prefix_size,
-    #         codec=codec
-    #     )
-
     @property
     def maddr(self) -> str:
         host, port = self.raddr.unwrap()
         return (
+            # TODO, use `ipaddress` from stdlib to handle
+            # first detecting which of `ipv4/6` before
+            # choosing the routing prefix part.
             f'/ipv4/{host}'
+
             f'/{self.address_type.name_key}/{port}'
             # f'/{self.chan.uid[0]}'
             # f'/{self.cid}'
@@ -94,12 +85,15 @@ class MsgpackTCPStream(MsgpackTransport):
         cls,
         stream: trio.SocketStream
     ) -> tuple[
-        tuple[str, int],
+        TCPAddress,
-        tuple[str, int]
+        TCPAddress,
     ]:
+        # TODO, what types are these?
         lsockname = stream.socket.getsockname()
+        l_sockaddr: tuple[str, int] = tuple(lsockname[:2])
         rsockname = stream.socket.getpeername()
+        r_sockaddr: tuple[str, int] = tuple(rsockname[:2])
         return (
-            TCPAddress.from_addr(tuple(lsockname[:2])),
+            TCPAddress.from_addr(l_sockaddr),
-            TCPAddress.from_addr(tuple(rsockname[:2])),
+            TCPAddress.from_addr(r_sockaddr),
         )

tractor/ipc/_uds.py

@@ -18,8 +18,23 @@ Unix Domain Socket implementation of tractor.ipc._transport.MsgTransport protoco
 
 '''
 from __future__ import annotations
+from pathlib import Path
+import os
+from socket import (
+    # socket,
+    AF_UNIX,
+    SOCK_STREAM,
+    SO_PASSCRED,
+    SO_PEERCRED,
+    SOL_SOCKET,
+)
+import struct
 
 import trio
+from trio._highlevel_open_unix_stream import (
+    close_on_error,
+    has_unix,
+)
 
 from tractor.msg import MsgCodec
 from tractor.log import get_logger
@@ -30,33 +45,80 @@ from tractor.ipc._transport import MsgpackTransport
 log = get_logger(__name__)
 
 
+async def open_unix_socket_w_passcred(
+    filename: str|bytes|os.PathLike[str]|os.PathLike[bytes],
+) -> trio.SocketStream:
+    '''
+    Literally the exact same as `trio.open_unix_socket()` except we set the additiona
+    `socket.SO_PASSCRED` option to ensure the server side (the process calling `accept()`)
+    can extract the connecting peer's credentials, namely OS specific process
+    related IDs.
+
+    See this SO for "why" the extra opts,
+    - https://stackoverflow.com/a/7982749
+
+    '''
+    if not has_unix:
+        raise RuntimeError("Unix sockets are not supported on this platform")
+
+    # much more simplified logic vs tcp sockets - one socket type and only one
+    # possible location to connect to
+    sock = trio.socket.socket(AF_UNIX, SOCK_STREAM)
+    sock.setsockopt(SOL_SOCKET, SO_PASSCRED, 1)
+    with close_on_error(sock):
+        await sock.connect(os.fspath(filename))
+
+    return trio.SocketStream(sock)
+
+
+def get_peer_info(sock: trio.socket.socket) -> tuple[
+    int,  # pid
+    int,  # uid
+    int,  # guid
+]:
+    '''
+    Deliver the connecting peer's "credentials"-info as defined in
+    a very Linux specific way..
+
+    For more deats see,
+    - `man accept`,
+    - `man unix`,
+
+    this great online guide to all things sockets,
+    - https://beej.us/guide/bgnet/html/split-wide/man-pages.html#setsockoptman
+
+    AND this **wonderful SO answer**
+    - https://stackoverflow.com/a/7982749
+
+    '''
+    creds: bytes = sock.getsockopt(
+        SOL_SOCKET,
+        SO_PEERCRED,
+        struct.calcsize('3i')
+    )
+    # i.e a tuple of the fields,
+    # pid: int, "process"
+    # uid: int, "user"
+    # gid: int, "group"
+    return struct.unpack('3i', creds)
+
+
 class MsgpackUDSStream(MsgpackTransport):
     '''
-    A ``trio.SocketStream`` delivering ``msgpack`` formatted data
+    A `trio.SocketStream` around a Unix-Domain-Socket transport
-    using the ``msgspec`` codec lib.
+    delivering `msgpack` encoded msgs using the `msgspec` codec lib.
 
     '''
     address_type = UDSAddress
-    layer_key: int = 7
+    layer_key: int = 4
-
-    # def __init__(
-    #     self,
-    #     stream: trio.SocketStream,
-    #     prefix_size: int = 4,
-    #     codec: CodecType = None,
-
-    # ) -> None:
-    #     super().__init__(
-    #         stream,
-    #         prefix_size=prefix_size,
-    #         codec=codec
-    #     )
 
     @property
     def maddr(self) -> str:
-        filepath = self.raddr.unwrap()
+        if not self.raddr:
+            return '<unknown-peer>'
+
+        filepath: Path = Path(self.raddr.unwrap()[0])
         return (
-            f'/ipv4/localhost'
             f'/{self.address_type.name_key}/{filepath}'
             # f'/{self.chan.uid[0]}'
             # f'/{self.cid}'
@@ -76,22 +138,72 @@ class MsgpackUDSStream(MsgpackTransport):
         codec: MsgCodec|None = None,
         **kwargs
     ) -> MsgpackUDSStream:
-        stream = await trio.open_unix_socket(
+
-            addr.unwrap(),
+        filepath: Path
+        pid: int
+        (
+            filepath,
+            pid,
+        ) = addr.unwrap()
+
+        # XXX NOTE, we don't need to provide the `.pid` part from
+        # the addr since the OS does this implicitly! .. lel
+        # stream = await trio.open_unix_socket(
+        stream = await open_unix_socket_w_passcred(
+            str(filepath),
             **kwargs
         )
-        return MsgpackUDSStream(
+        stream = MsgpackUDSStream(
             stream,
             prefix_size=prefix_size,
             codec=codec
         )
+        stream._raddr = addr
+        return stream
 
     @classmethod
     def get_stream_addrs(
         cls,
         stream: trio.SocketStream
-    ) -> tuple[UDSAddress, UDSAddress]:
+    ) -> tuple[
-        return (
+        Path,
-            UDSAddress.from_addr(stream.socket.getsockname()),
+        int,
-            UDSAddress.from_addr(stream.socket.getsockname()),
+    ]:
+        sock: trio.socket.socket = stream.socket
+
+        # NOTE XXX, it's unclear why one or the other ends up being
+        # `bytes` versus the socket-file-path, i presume it's
+        # something to do with who is the server (called `.listen()`)?
+        # maybe could be better implemented using another info-query
+        # on the socket like,
+        # https://beej.us/guide/bgnet/html/split-wide/system-calls-or-bust.html#gethostnamewho-am-i
+        sockname: str|bytes = sock.getsockname()
+        # https://beej.us/guide/bgnet/html/split-wide/system-calls-or-bust.html#getpeernamewho-are-you
+        peername: str|bytes = sock.getpeername()
+        match (peername, sockname):
+            case (str(), bytes()):
+                sock_path: Path = Path(peername)
+            case (bytes(), str()):
+                sock_path: Path = Path(sockname)
+        (
+            pid,
+            uid,
+            gid,
+        ) = get_peer_info(sock)
+        log.info(
+            f'UDS connection from process {pid!r}\n'
+            f'>[\n'
+            f'|_{sock_path}\n'
+            f'   |_pid: {pid}\n'
+            f'   |_uid: {uid}\n'
+            f'   |_gid: {gid}\n'
         )
+        laddr = UDSAddress.from_addr((
+            sock_path,
+            os.getpid(),
+        ))
+        raddr = UDSAddress.from_addr((
+            sock_path,
+            pid
+        ))
+        return (laddr, raddr)

tractor/msg/types.py

@@ -31,6 +31,7 @@ from typing import (
     Type,
     TypeVar,
     TypeAlias,
+    # TYPE_CHECKING,
     Union,
 )
 
@@ -47,7 +48,7 @@ from tractor.msg import (
     pretty_struct,
 )
 from tractor.log import get_logger
-from tractor._addr import AddressTypes
+from tractor._addr import UnwrappedAddress
 
 
 log = get_logger('tractor.msgspec')
@@ -142,9 +143,15 @@ class Aid(
     '''
     name: str
     uuid: str
-    # TODO: use built-in support for UUIDs?
+
-    # -[ ] `uuid.UUID` which has multi-protocol support
+    # TODO? can/should we extend this field set?
-    #  https://jcristharif.com/msgspec/supported-types.html#uuid
+    # -[ ] use built-in support for UUIDs? `uuid.UUID` which has
+    #     multi-protocol support
+    #     https://jcristharif.com/msgspec/supported-types.html#uuid
+    #
+    # -[ ] as per the `.ipc._uds` / `._addr` comments, maybe we
+    #     should also include at least `.pid` (equiv to port for tcp)
+    #     and/or host-part always?
 
 
 class SpawnSpec(
@@ -168,8 +175,8 @@ class SpawnSpec(
 
     # TODO: not just sockaddr pairs?
     # -[ ] abstract into a `TransportAddr` type?
-    reg_addrs: list[AddressTypes]
+    reg_addrs: list[UnwrappedAddress]
-    bind_addrs: list[AddressTypes]
+    bind_addrs: list[UnwrappedAddress]|None
 
 
 # TODO: caps based RPC support in the payload?