Exclude crypto futes from `without_src` sym key

Extend the `col_sym_key` asset-type check in `start_backfill()`
to also exclude crypto-denominated futures (where `src` is
`'crypto_currency'` and `dst` is `'future'`) from the
`without_src=True` fqme path.

Also in `.brokers.binance` backend (it being the guilty culprit in the
discovery of this bug; and why i touched styling this code),

- reformat `make_sub()` fn sig to multiline style in
  `.binance.feed`.
- add backtick around `dict` in `make_sub()` docstring.
- reformat `or` conditionals to multiline style in
  `.binance.feed.get_mkt_info()`.

(this commit msg was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code

piker/brokers/deribit/feed.py

@@ -32,7 +32,7 @@ import tractor
 
 from piker.brokers import open_cached_client
 from piker.log import get_logger, get_console_log
-from tractor.ipc._shm import ShmArray
+from piker.data import ShmArray
 from piker.brokers._util import (
     BrokerError,
     DataUnavailable,

piker/data/__init__.py

@@ -23,13 +23,13 @@ sharing live streams over a network.
 
 """
 from .ticktools import iterticks
-from tractor.ipc._shm import (
-    ShmArray,
+from ._sharedmem import (
+    maybe_open_shm_array,
+    attach_shm_array,
+    open_shm_array,
     get_shm_token,
-    open_shm_ndarray as open_shm_array,
-    attach_shm_ndarray as attach_shm_array,
+    ShmArray,
 )
-from ._sharedmem import maybe_open_shm_array
 from ._source import (
     def_iohlcv_fields,
     def_ohlcv_fields,

piker/data/_formatters.py

@@ -28,7 +28,9 @@ from msgspec import field
 import numpy as np
 from numpy.lib import recfunctions as rfn
 
-from tractor.ipc._shm import ShmArray
+from ._sharedmem import (
+    ShmArray,
+)
 from ._pathops import (
     path_arrays_from_ohlc,
 )

piker/data/_sampling.py

@@ -55,7 +55,9 @@ from ._util import (
 from ..service import maybe_spawn_daemon
 
 if TYPE_CHECKING:
-    from tractor.ipc._shm import ShmArray
+    from ._sharedmem import (
+        ShmArray,
+    )
     from .feed import (
         _FeedsBus,
         Sub,
@@ -376,16 +378,16 @@ async def register_with_sampler(
                 # feed_is_live.is_set()
                 # ^TODO? pass it in instead?
             ):
-                from tractor.ipc._shm import (
-                    attach_shm_ndarray,
-                    NDToken,
+                from ._sharedmem import (
+                    attach_shm_array,
+                    _Token,
                 )
                 for period in shms_by_period:
 
                     # load and register shm handles
                     shm_token_msg = shms_by_period[period]
-                    shm = attach_shm_ndarray(
-                        NDToken.from_msg(shm_token_msg),
+                    shm = attach_shm_array(
+                        _Token.from_msg(shm_token_msg),
                         readonly=False,
                     )
                     shms_by_period[period] = shm

piker/data/_sharedmem.py

@@ -1,67 +1,622 @@
 # piker: trading gear for hackers
 # Copyright (C) Tyler Goodlet (in stewardship for pikers)
 
-# This program is free software: you can redistribute it
-# and/or modify it under the terms of the GNU Affero General
-# Public License as published by the Free Software
-# Foundation, either version 3 of the License, or (at your
-# option) any later version.
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
-# This program is distributed in the hope that it will be
-# useful, but WITHOUT ANY WARRANTY; without even the implied
-# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
-# PURPOSE.  See the GNU Affero General Public License for
-# more details.
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
 
-# You should have received a copy of the GNU Affero General
-# Public License along with this program.  If not, see
-# <https://www.gnu.org/licenses/>.
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-'''
-Piker-specific shared memory helpers.
+"""
+NumPy compatible shared memory buffers for real-time IPC streaming.
 
-Thin shim providing piker-only wrappers around
-``tractor.ipc._shm``; all core types and functions
-are now imported directly from tractor throughout
-the codebase.
+"""
+from __future__ import annotations
+from sys import byteorder
+import time
+from typing import Optional
+from multiprocessing.shared_memory import SharedMemory, _USE_POSIX
 
-'''
+if _USE_POSIX:
+    from _posixshmem import shm_unlink
+
+# import msgspec
 import numpy as np
-
-from tractor.ipc._shm import (
-    NDToken,
-    ShmArray,
-    _known_tokens,
-    _make_token as _tractor_make_token,
-    open_shm_ndarray,
-    attach_shm_ndarray,
-)
+from numpy.lib import recfunctions as rfn
+import tractor
 
 from ._util import log
+from ._source import def_iohlcv_fields
+from piker.types import Struct
+
+
+def cuckoff_mantracker():
+    '''
+    Disable all ``multiprocessing``` "resource tracking" machinery since
+    it's an absolute multi-threaded mess of non-SC madness.
+
+    '''
+    from multiprocessing import resource_tracker as mantracker
+
+    # Tell the "resource tracker" thing to fuck off.
+    class ManTracker(mantracker.ResourceTracker):
+        def register(self, name, rtype):
+            pass
+
+        def unregister(self, name, rtype):
+            pass
+
+        def ensure_running(self):
+            pass
+
+    # "know your land and know your prey"
+    # https://www.dailymotion.com/video/x6ozzco
+    mantracker._resource_tracker = ManTracker()
+    mantracker.register = mantracker._resource_tracker.register
+    mantracker.ensure_running = mantracker._resource_tracker.ensure_running
+    mantracker.unregister = mantracker._resource_tracker.unregister
+    mantracker.getfd = mantracker._resource_tracker.getfd
+
+
+cuckoff_mantracker()
+
+
+class SharedInt:
+    """Wrapper around a single entry shared memory array which
+    holds an ``int`` value used as an index counter.
+
+    """
+    def __init__(
+        self,
+        shm: SharedMemory,
+    ) -> None:
+        self._shm = shm
+
+    @property
+    def value(self) -> int:
+        return int.from_bytes(self._shm.buf, byteorder)
+
+    @value.setter
+    def value(self, value) -> None:
+        self._shm.buf[:] = value.to_bytes(self._shm.size, byteorder)
+
+    def destroy(self) -> None:
+        if _USE_POSIX:
+            # We manually unlink to bypass all the "resource tracker"
+            # nonsense meant for non-SC systems.
+            name = self._shm.name
+            try:
+                shm_unlink(name)
+            except FileNotFoundError:
+                # might be a teardown race here?
+                log.warning(f'Shm for {name} already unlinked?')
+
+
+class _Token(Struct, frozen=True):
+    '''
+    Internal represenation of a shared memory "token"
+    which can be used to key a system wide post shm entry.
+
+    '''
+    shm_name: str  # this servers as a "key" value
+    shm_first_index_name: str
+    shm_last_index_name: str
+    dtype_descr: tuple
+    size: int  # in struct-array index / row terms
+
+    @property
+    def dtype(self) -> np.dtype:
+        return np.dtype(list(map(tuple, self.dtype_descr))).descr
+
+    def as_msg(self):
+        return self.to_dict()
+
+    @classmethod
+    def from_msg(cls, msg: dict) -> _Token:
+        if isinstance(msg, _Token):
+            return msg
+
+        # TODO: native struct decoding
+        # return _token_dec.decode(msg)
+
+        msg['dtype_descr'] = tuple(map(tuple, msg['dtype_descr']))
+        return _Token(**msg)
+
+
+# _token_dec = msgspec.msgpack.Decoder(_Token)
+
+# TODO: this api?
+# _known_tokens = tractor.ActorVar('_shm_tokens', {})
+# _known_tokens = tractor.ContextStack('_known_tokens', )
+# _known_tokens = trio.RunVar('shms', {})
+
+# process-local store of keys to tokens
+_known_tokens = {}
+
+
+def get_shm_token(key: str) -> _Token:
+    """Convenience func to check if a token
+    for the provided key is known by this process.
+    """
+    return _known_tokens.get(key)
 
 
 def _make_token(
     key: str,
     size: int,
-    dtype: np.dtype|None = None,
-) -> NDToken:
+    dtype: Optional[np.dtype] = None,
+) -> _Token:
     '''
-    Wrap tractor's ``_make_token()`` with piker's
-    default dtype fallback to ``def_iohlcv_fields``.
+    Create a serializable token that can be used
+    to access a shared array.
 
     '''
-    from ._source import def_iohlcv_fields
-    dtype = (
-        def_iohlcv_fields
-        if dtype is None
-        else dtype
+    dtype = def_iohlcv_fields if dtype is None else dtype
+    return _Token(
+        shm_name=key,
+        shm_first_index_name=key + "_first",
+        shm_last_index_name=key + "_last",
+        dtype_descr=tuple(np.dtype(dtype).descr),
+        size=size,
     )
-    return _tractor_make_token(
+
+
+class ShmArray:
+    '''
+    A shared memory ``numpy`` (compatible) array API.
+
+    An underlying shared memory buffer is allocated based on
+    a user specified ``numpy.ndarray``. This fixed size array
+    can be read and written to by pushing data both onto the "front"
+    or "back" of a set index range. The indexes for the "first" and
+    "last" index are themselves stored in shared memory (accessed via
+    ``SharedInt`` interfaces) values such that multiple processes can
+    interact with the same array using a synchronized-index.
+
+    '''
+    def __init__(
+        self,
+        shmarr: np.ndarray,
+        first: SharedInt,
+        last: SharedInt,
+        shm: SharedMemory,
+        # readonly: bool = True,
+    ) -> None:
+        self._array = shmarr
+
+        # indexes for first and last indices corresponding
+        # to fille data
+        self._first = first
+        self._last = last
+
+        self._len = len(shmarr)
+        self._shm = shm
+        self._post_init: bool = False
+
+        # pushing data does not write the index (aka primary key)
+        dtype = shmarr.dtype
+        if dtype.fields:
+            self._write_fields = list(shmarr.dtype.fields.keys())[1:]
+        else:
+            self._write_fields = None
+
+    # TODO: ringbuf api?
+
+    @property
+    def _token(self) -> _Token:
+        return _Token(
+            shm_name=self._shm.name,
+            shm_first_index_name=self._first._shm.name,
+            shm_last_index_name=self._last._shm.name,
+            dtype_descr=tuple(self._array.dtype.descr),
+            size=self._len,
+        )
+
+    @property
+    def token(self) -> dict:
+        """Shared memory token that can be serialized and used by
+        another process to attach to this array.
+        """
+        return self._token.as_msg()
+
+    @property
+    def index(self) -> int:
+        return self._last.value % self._len
+
+    @property
+    def array(self) -> np.ndarray:
+        '''
+        Return an up-to-date ``np.ndarray`` view of the
+        so-far-written data to the underlying shm buffer.
+
+        '''
+        a = self._array[self._first.value:self._last.value]
+
+        # first, last = self._first.value, self._last.value
+        # a = self._array[first:last]
+
+        # TODO: eventually comment this once we've not seen it in the
+        # wild in a long time..
+        # XXX: race where first/last indexes cause a reader
+        # to load an empty array..
+        if len(a) == 0 and self._post_init:
+            raise RuntimeError('Empty array race condition hit!?')
+
+        return a
+
+    def ustruct(
+        self,
+        fields: Optional[list[str]] = None,
+
+        # type that all field values will be cast to
+        # in the returned view.
+        common_dtype: np.dtype = float,
+
+    ) -> np.ndarray:
+
+        array = self._array
+
+        if fields:
+            selection = array[fields]
+            # fcount = len(fields)
+        else:
+            selection = array
+            # fcount = len(array.dtype.fields)
+
+        # XXX: manual ``.view()`` attempt that also doesn't work.
+        # uview = selection.view(
+        #     dtype='<f16',
+        # ).reshape(-1, 4, order='A')
+
+        # assert len(selection) == len(uview)
+
+        u = rfn.structured_to_unstructured(
+            selection,
+            # dtype=float,
+            copy=True,
+        )
+
+        # unstruct = np.ndarray(u.shape, dtype=a.dtype, buffer=shm.buf)
+        # array[:] = a[:]
+        return u
+        # return ShmArray(
+        #     shmarr=u,
+        #     first=self._first,
+        #     last=self._last,
+        #     shm=self._shm
+        # )
+
+    def last(
+        self,
+        length: int = 1,
+
+    ) -> np.ndarray:
+        '''
+        Return the last ``length``'s worth of ("row") entries from the
+        array.
+
+        '''
+        return self.array[-length:]
+
+    def push(
+        self,
+        data: np.ndarray,
+
+        field_map: Optional[dict[str, str]] = None,
+        prepend: bool = False,
+        update_first: bool = True,
+        start: int | None = None,
+
+    ) -> int:
+        '''
+        Ring buffer like "push" to append data
+        into the buffer and return updated "last" index.
+
+        NB: no actual ring logic yet to give a "loop around" on overflow
+        condition, lel.
+
+        '''
+        length = len(data)
+
+        if prepend:
+            index = (start or self._first.value) - length
+
+            if index < 0:
+                raise ValueError(
+                    f'Array size of {self._len} was overrun during prepend.\n'
+                    f'You have passed {abs(index)} too many datums.'
+                )
+
+        else:
+            index = start if start is not None else self._last.value
+
+        end = index + length
+
+        if field_map:
+            src_names, dst_names = zip(*field_map.items())
+        else:
+            dst_names = src_names = self._write_fields
+
+        try:
+            self._array[
+                list(dst_names)
+            ][index:end] = data[list(src_names)][:]
+
+            # NOTE: there was a race here between updating
+            # the first and last indices and when the next reader
+            # tries to access ``.array`` (which due to the index
+            # overlap will be empty). Pretty sure we've fixed it now
+            # but leaving this here as a reminder.
+            if (
+                prepend
+                and update_first
+                and length
+            ):
+                assert index < self._first.value
+
+            if (
+                index < self._first.value
+                and update_first
+            ):
+                assert prepend, 'prepend=True not passed but index decreased?'
+                self._first.value = index
+
+            elif not prepend:
+                self._last.value = end
+
+            self._post_init = True
+            return end
+
+        except ValueError as err:
+            if field_map:
+                raise
+
+            # should raise if diff detected
+            self.diff_err_fields(data)
+            raise err
+
+    def diff_err_fields(
+        self,
+        data: np.ndarray,
+    ) -> None:
+        # reraise with any field discrepancy
+        our_fields, their_fields = (
+            set(self._array.dtype.fields),
+            set(data.dtype.fields),
+        )
+
+        only_in_ours = our_fields - their_fields
+        only_in_theirs = their_fields - our_fields
+
+        if only_in_ours:
+            raise TypeError(
+                f"Input array is missing field(s): {only_in_ours}"
+            )
+        elif only_in_theirs:
+            raise TypeError(
+                f"Input array has unknown field(s): {only_in_theirs}"
+            )
+
+    # TODO: support "silent" prepends that don't update ._first.value?
+    def prepend(
+        self,
+        data: np.ndarray,
+    ) -> int:
+        end = self.push(data, prepend=True)
+        assert end
+
+    def close(self) -> None:
+        self._first._shm.close()
+        self._last._shm.close()
+        self._shm.close()
+
+    def destroy(self) -> None:
+        if _USE_POSIX:
+            # We manually unlink to bypass all the "resource tracker"
+            # nonsense meant for non-SC systems.
+            shm_unlink(self._shm.name)
+
+        self._first.destroy()
+        self._last.destroy()
+
+    def flush(self) -> None:
+        # TODO: flush to storage backend like markestore?
+        ...
+
+
+def open_shm_array(
+    size: int,
+    key: str | None = None,
+    dtype: np.dtype | None = None,
+    append_start_index: int | None = None,
+    readonly: bool = False,
+
+) -> ShmArray:
+    '''Open a memory shared ``numpy`` using the standard library.
+
+    This call unlinks (aka permanently destroys) the buffer on teardown
+    and thus should be used from the parent-most accessor (process).
+
+    '''
+    # create new shared mem segment for which we
+    # have write permission
+    a = np.zeros(size, dtype=dtype)
+    a['index'] = np.arange(len(a))
+
+    shm = SharedMemory(
+        name=key,
+        create=True,
+        size=a.nbytes
+    )
+    array = np.ndarray(
+        a.shape,
+        dtype=a.dtype,
+        buffer=shm.buf
+    )
+    array[:] = a[:]
+    array.setflags(write=int(not readonly))
+
+    token = _make_token(
         key=key,
         size=size,
         dtype=dtype,
     )
 
+    # create single entry arrays for storing an first and last indices
+    first = SharedInt(
+        shm=SharedMemory(
+            name=token.shm_first_index_name,
+            create=True,
+            size=4,  # std int
+        )
+    )
+
+    last = SharedInt(
+        shm=SharedMemory(
+            name=token.shm_last_index_name,
+            create=True,
+            size=4,  # std int
+        )
+    )
+
+    # start the "real-time" updated section after 3-days worth of 1s
+    # sampled OHLC. this allows appending up to a days worth from
+    # tick/quote feeds before having to flush to a (tsdb) storage
+    # backend, and looks something like,
+    # -------------------------
+    # |              |        i
+    # _________________________
+    # <-------------> <------->
+    #  history         real-time
+    #
+    # Once fully "prepended", the history section will leave the
+    # ``ShmArray._start.value: int = 0`` and the yet-to-be written
+    # real-time section will start at ``ShmArray.index: int``.
+
+    # this sets the index to nearly 2/3rds into the the length of
+    # the buffer leaving at least a "days worth of second samples"
+    # for the real-time section.
+    if append_start_index is None:
+        append_start_index = round(size * 0.616)
+
+    last.value = first.value = append_start_index
+
+    shmarr = ShmArray(
+        array,
+        first,
+        last,
+        shm,
+    )
+
+    assert shmarr._token == token
+    _known_tokens[key] = shmarr.token
+
+    # "unlink" created shm on process teardown by
+    # pushing teardown calls onto actor context stack
+    stack = tractor.current_actor(
+        err_on_no_runtime=False,
+    ).lifetime_stack
+    if stack:
+        stack.callback(shmarr.close)
+        stack.callback(shmarr.destroy)
+
+    return shmarr
+
+
+def attach_shm_array(
+    token: tuple[str, str, tuple[str, str]],
+    readonly: bool = True,
+
+) -> ShmArray:
+    '''
+    Attach to an existing shared memory array previously
+    created by another process using ``open_shared_array``.
+
+    No new shared mem is allocated but wrapper types for read/write
+    access are constructed.
+
+    '''
+    token = _Token.from_msg(token)
+    key = token.shm_name
+
+    if key in _known_tokens:
+        assert _Token.from_msg(_known_tokens[key]) == token, "WTF"
+
+    # XXX: ugh, looks like due to the ``shm_open()`` C api we can't
+    # actually place files in a subdir, see discussion here:
+    # https://stackoverflow.com/a/11103289
+
+    # attach to array buffer and view as per dtype
+    _err: Optional[Exception] = None
+    for _ in range(3):
+        try:
+            shm = SharedMemory(
+                name=key,
+                create=False,
+            )
+            break
+        except OSError as oserr:
+            _err = oserr
+            time.sleep(0.1)
+    else:
+        if _err:
+            raise _err
+
+    shmarr = np.ndarray(
+        (token.size,),
+        dtype=token.dtype,
+        buffer=shm.buf
+    )
+    shmarr.setflags(write=int(not readonly))
+
+    first = SharedInt(
+        shm=SharedMemory(
+            name=token.shm_first_index_name,
+            create=False,
+            size=4,  # std int
+        ),
+    )
+    last = SharedInt(
+        shm=SharedMemory(
+            name=token.shm_last_index_name,
+            create=False,
+            size=4,  # std int
+        ),
+    )
+
+    # make sure we can read
+    first.value
+
+    sha = ShmArray(
+        shmarr,
+        first,
+        last,
+        shm,
+    )
+    # read test
+    sha.array
+
+    # Stash key -> token knowledge for future queries
+    # via `maybe_opepn_shm_array()` but only after we know
+    # we can attach.
+    if key not in _known_tokens:
+        _known_tokens[key] = token
+
+    # "close" attached shm on actor teardown
+    if (actor := tractor.current_actor(
+        err_on_no_runtime=False,
+    )):
+        actor.lifetime_stack.callback(sha.close)
+
+    return sha
+
 
 def maybe_open_shm_array(
     key: str,
@@ -70,37 +625,37 @@ def maybe_open_shm_array(
     append_start_index: int | None = None,
     readonly: bool = False,
     **kwargs,
+
 ) -> tuple[ShmArray, bool]:
     '''
-    Attempt to attach to a shared memory block
-    using a "key" lookup to registered blocks in
-    the user's overall "system" registry (presumes
-    you don't have the block's explicit token).
+    Attempt to attach to a shared memory block using a "key" lookup
+    to registered blocks in the users overall "system" registry
+    (presumes you don't have the block's explicit token).
 
-    This is a thin wrapper around tractor's
-    ``maybe_open_shm_ndarray()`` preserving piker's
-    historical defaults (``readonly=False``,
-    ``append_start_index=None``).
+    This function is meant to solve the problem of discovering whether
+    a shared array token has been allocated or discovered by the actor
+    running in **this** process. Systems where multiple actors may seek
+    to access a common block can use this function to attempt to acquire
+    a token as discovered by the actors who have previously stored
+    a "key" -> ``_Token`` map in an actor local (aka python global)
+    variable.
 
-    If you know the explicit ``NDToken`` for your
-    memory segment instead use
-    ``tractor.ipc._shm.attach_shm_ndarray()``.
+    If you know the explicit ``_Token`` for your memory segment instead
+    use ``attach_shm_array``.
 
     '''
     try:
         # see if we already know this key
         token = _known_tokens[key]
         return (
-            attach_shm_ndarray(
+            attach_shm_array(
                 token=token,
                 readonly=readonly,
             ),
             False,
         )
     except KeyError:
-        log.debug(
-            f'Could not find {key} in shms cache'
-        )
+        log.debug(f"Could not find {key} in shms cache")
         if dtype:
             token = _make_token(
                 key,
@@ -108,18 +663,9 @@ def maybe_open_shm_array(
                 dtype=dtype,
             )
             try:
-                return (
-                    attach_shm_ndarray(
-                        token=token,
-                        **kwargs,
-                    ),
-                    False,
-                )
+                return attach_shm_array(token=token, **kwargs), False
             except FileNotFoundError:
-                log.debug(
-                    f'Could not attach to shm'
-                    f' with token {token}'
-                )
+                log.debug(f"Could not attach to shm with token {token}")
 
         # This actor does not know about memory
         # associated with the provided "key".
@@ -127,7 +673,7 @@ def maybe_open_shm_array(
         # to fail if a block has been allocated
         # on the OS by someone else.
         return (
-            open_shm_ndarray(
+            open_shm_array(
                 key=key,
                 size=size,
                 dtype=dtype,
@@ -137,20 +683,18 @@ def maybe_open_shm_array(
             True,
         )
 
-
 def try_read(
-    array: np.ndarray,
-) -> np.ndarray|None:
-    '''
-    Try to read the last row from a shared mem
-    array or ``None`` if the array read returns
-    a zero-length array result.
+    array: np.ndarray
 
-    Can be used to check for backfilling race
-    conditions where an array is currently being
-    (re-)written by a writer actor but the reader
-    is unaware and reads during the window where
-    the first and last indexes are being updated.
+) -> Optional[np.ndarray]:
+    '''
+    Try to read the last row from a shared mem array or ``None``
+    if the array read returns a zero-length array result.
+
+    Can be used to check for backfilling race conditions where an array
+    is currently being (re-)written by a writer actor but the reader is
+    unaware and reads during the window where the first and last indexes
+    are being updated.
 
     '''
     try:
@@ -158,13 +702,14 @@ def try_read(
     except IndexError:
         # XXX: race condition with backfilling shm.
         #
-        # the underlying issue is that a backfill
-        # (aka prepend) and subsequent shm array
-        # first/last index update could result in an
-        # empty array read here since the indices may
-        # be updated in such a way that a read delivers
-        # an empty array (though it seems like we
-        # *should* be able to prevent that?).
+        # the underlying issue is that a backfill (aka prepend) and subsequent
+        # shm array first/last index update could result in an empty array
+        # read here since the indices may be updated in such a way that
+        # a read delivers an empty array (though it seems like we
+        # *should* be able to prevent that?). also, as and alt and
+        # something we need anyway, maybe there should be some kind of
+        # signal that a prepend is taking place and this consumer can
+        # respond (eg. redrawing graphics) accordingly.
 
-        # the array read was empty
+        # the array read was emtpy
         return None

piker/data/flows.py

@@ -28,10 +28,10 @@ import pendulum
 import numpy as np
 
 from piker.types import Struct
-from tractor.ipc._shm import (
+from ._sharedmem import (
+    attach_shm_array,
     ShmArray,
-    NDToken,
-    attach_shm_ndarray,
+    _Token,
 )
 from piker.accounting import MktPair
 
@@ -58,11 +58,11 @@ class Flume(Struct):
     '''
     mkt: MktPair
     first_quote: dict
-    _rt_shm_token: NDToken
+    _rt_shm_token: _Token
 
     # optional since some data flows won't have a "downsampled" history
     # buffer/stream (eg. FSPs).
-    _hist_shm_token: NDToken|None = None
+    _hist_shm_token: _Token | None = None
 
     # private shm refs loaded dynamically from tokens
     _hist_shm: ShmArray | None = None
@@ -78,7 +78,7 @@ class Flume(Struct):
     def rt_shm(self) -> ShmArray:
 
         if self._rt_shm is None:
-            self._rt_shm = attach_shm_ndarray(
+            self._rt_shm = attach_shm_array(
                 token=self._rt_shm_token,
                 readonly=self._readonly,
             )
@@ -94,7 +94,7 @@ class Flume(Struct):
             )
 
         if self._hist_shm is None:
-            self._hist_shm = attach_shm_ndarray(
+            self._hist_shm = attach_shm_array(
                 token=self._hist_shm_token,
                 readonly=self._readonly,
             )

piker/fsp/_api.py

@@ -37,12 +37,12 @@ import numpy as np
 import tractor
 from tractor.msg import NamespacePath
 
-from tractor.ipc._shm import (
+from ..data._sharedmem import (
     ShmArray,
-    NDToken,
-    attach_shm_ndarray,
+    maybe_open_shm_array,
+    attach_shm_array,
+    _Token,
 )
-from ..data._sharedmem import maybe_open_shm_array
 from ..log import get_logger
 
 log = get_logger(__name__)
@@ -78,8 +78,8 @@ class Fsp:
     # + the consuming fsp *to* the consumers output
     # shm flow.
     _flow_registry: dict[
-        tuple[NDToken, str],
-        tuple[NDToken, Optional[ShmArray]],
+        tuple[_Token, str],
+        tuple[_Token, Optional[ShmArray]],
     ] = {}
 
     def __init__(
@@ -148,7 +148,7 @@ class Fsp:
                 # times as possible as per:
                 # - https://github.com/pikers/piker/issues/359
                 # - https://github.com/pikers/piker/issues/332
-                maybe_array := attach_shm_ndarray(dst_token)
+                maybe_array := attach_shm_array(dst_token)
             )
 
         return maybe_array

piker/fsp/_engine.py

@@ -40,7 +40,7 @@ from ..log import (
 )
 from .. import data
 from ..data.flows import Flume
-from tractor.ipc._shm import ShmArray
+from ..data._sharedmem import ShmArray
 from ..data._sampling import (
     _default_delay_s,
     open_sample_stream,
@@ -49,7 +49,7 @@ from ..accounting import MktPair
 from ._api import (
     Fsp,
     _load_builtins,
-    NDToken,
+    _Token,
 )
 from ..toolz import Profiler
 
@@ -414,7 +414,7 @@ async def cascade(
     dst_flume_addr: dict,
     ns_path: NamespacePath,
 
-    shm_registry: dict[str, NDToken],
+    shm_registry: dict[str, _Token],
 
     zero_on_step: bool = False,
     loglevel: str|None = None,
@@ -465,9 +465,9 @@ async def cascade(
     # not sure how else to do it.
     for (token, fsp_name, dst_token) in shm_registry:
         Fsp._flow_registry[(
-            NDToken.from_msg(token),
+            _Token.from_msg(token),
             fsp_name,
-        )] = NDToken.from_msg(dst_token), None
+        )] = _Token.from_msg(dst_token), None
 
     fsp: Fsp = reg.get(
         NamespacePath(ns_path)

piker/fsp/_momo.py

@@ -25,7 +25,7 @@ from numba import jit, float64, optional, int64
 
 from ._api import fsp
 from ..data import iterticks
-from tractor.ipc._shm import ShmArray
+from ..data._sharedmem import ShmArray
 
 
 @jit(

piker/fsp/_volume.py

@@ -21,7 +21,7 @@ from tractor.trionics._broadcast import AsyncReceiver
 
 from ._api import fsp
 from ..data import iterticks
-from tractor.ipc._shm import ShmArray
+from ..data._sharedmem import ShmArray
 from ._momo import _wma
 from ..log import get_logger
 

piker/storage/cli.py

@@ -37,7 +37,9 @@ import typer
 
 from piker.service import open_piker_runtime
 from piker.cli import cli
-from tractor.ipc._shm import ShmArray
+from piker.data import (
+    ShmArray,
+)
 from piker import tsp
 from . import log
 from . import (

piker/storage/nativedb.py

@@ -64,8 +64,10 @@ from pendulum import (
 
 from piker import config
 from piker import tsp
-from tractor.ipc._shm import ShmArray
-from piker.data import def_iohlcv_fields
+from piker.data import (
+    def_iohlcv_fields,
+    ShmArray,
+)
 from piker.log import get_logger
 from . import TimeseriesNotFound
 

piker/tsp/_history.py

@@ -63,8 +63,10 @@ from piker.log import (
     get_logger,
     get_console_log,
 )
-from tractor.ipc._shm import ShmArray
-from ..data._sharedmem import maybe_open_shm_array
+from ..data._sharedmem import (
+    maybe_open_shm_array,
+    ShmArray,
+)
 from piker.data._source import (
     def_iohlcv_fields,
 )

piker/ui/_chart.py

@@ -49,7 +49,7 @@ from ._cursor import (
     Cursor,
     ContentsLabel,
 )
-from tractor.ipc._shm import ShmArray
+from ..data._sharedmem import ShmArray
 from ._ohlc import BarItems
 from ._curve import (
     Curve,

piker/ui/_dataviz.py

@@ -42,7 +42,9 @@ from numpy import (
 import pyqtgraph as pg
 
 from piker.ui.qt import QLineF
-from tractor.ipc._shm import ShmArray
+from ..data._sharedmem import (
+    ShmArray,
+)
 from ..data.flows import Flume
 from ..data._formatters import (
     IncrementalFormatter,

piker/ui/_fsp.py

@@ -44,12 +44,14 @@ from piker.fsp import (
     dolla_vlm,
     flow_rates,
 )
-from tractor.ipc._shm import (
+from piker.data import (
+    Flume,
     ShmArray,
-    NDToken,
 )
-from piker.data import Flume
-from piker.data._sharedmem import try_read
+from piker.data._sharedmem import (
+    _Token,
+    try_read,
+)
 from piker.log import get_logger
 from piker.toolz import Profiler
 from piker.types import Struct
@@ -380,7 +382,7 @@ class FspAdmin:
             tuple,
             tuple[tractor.MsgStream, ShmArray]
         ] = {}
-        self._flow_registry: dict[NDToken, str] = {}
+        self._flow_registry: dict[_Token, str] = {}
 
         # TODO: make this a `.src_flume` and add
         # a `dst_flume`?

pyproject.toml

@@ -206,8 +206,9 @@ pyvnc = { git = "https://github.com/regulad/pyvnc.git" }
 # xonsh = { git = 'https://github.com/xonsh/xonsh.git', branch = 'main' }
 
 # XXX since, we're like, always hacking new shite all-the-time. Bp
-tractor = { git = "https://github.com/goodboy/tractor.git", branch ="main" }
+tractor = { git = "https://github.com/goodboy/tractor.git", branch ="piker_pin" }
 # tractor = { git = "https://pikers.dev/goodboy/tractor", branch = "piker_pin" }
+# tractor = { git = "https://pikers.dev/goodboy/tractor", branch = "main" }
 # ------ goodboy ------
 # hackin dev-envs, usually there's something new he's hackin in..
 # tractor = { path = "../tractor", editable = true }

uv.lock

@@ -1034,7 +1034,7 @@ requires-dist = [
     { name = "tomli", specifier = ">=2.0.1,<3.0.0" },
     { name = "tomli-w", specifier = ">=1.0.0,<2.0.0" },
     { name = "tomlkit", git = "https://github.com/pikers/tomlkit.git?branch=piker_pin" },
-    { name = "tractor", git = "https://github.com/goodboy/tractor.git?branch=main" },
+    { name = "tractor", git = "https://github.com/goodboy/tractor.git?branch=piker_pin" },
     { name = "trio", specifier = ">=0.27" },
     { name = "trio-typing", specifier = ">=0.10.0" },
     { name = "trio-util", specifier = ">=0.7.0,<0.8.0" },
@@ -1680,7 +1680,7 @@ wheels = [
 [[package]]
 name = "tractor"
 version = "0.1.0a6.dev0"
-source = { git = "https://github.com/goodboy/tractor.git?branch=main#e77198bb64f0467a50e251ed140daee439752354" }
+source = { git = "https://github.com/goodboy/tractor.git?branch=piker_pin#566a17ba92469000a01fd18c709ea3e336e72796" }
 dependencies = [
     { name = "bidict" },
     { name = "cffi" },