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Use struct for shm tokens

dpbackup
Tyler Goodlet 2022-07-06 12:42:46 -04:00
parent 693c7ce12a
commit 6cc02bd8f5
1 changed files with 11 additions and 8 deletions
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19
piker/data/_sharedmem.py
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@ -27,13 +27,14 @@ from multiprocessing.shared_memory import SharedMemory, _USE_POSIX
if _USE_POSIX: if _USE_POSIX:
from _posixshmem import shm_unlink from _posixshmem import shm_unlink
import tractor # import msgspec
import numpy as np import numpy as np
from pydantic import BaseModel
from numpy.lib import recfunctions as rfn from numpy.lib import recfunctions as rfn
import tractor
from ..log import get_logger from ..log import get_logger
from ._source import base_iohlc_dtype from ._source import base_iohlc_dtype
from .types import Struct
log = get_logger(__name__) log = get_logger(__name__)
@ -107,15 +108,12 @@ class SharedInt:
log.warning(f'Shm for {name} already unlinked?') log.warning(f'Shm for {name} already unlinked?')
class _Token(BaseModel): class _Token(Struct, frozen=True):
''' '''
Internal represenation of a shared memory "token" Internal represenation of a shared memory "token"
which can be used to key a system wide post shm entry. which can be used to key a system wide post shm entry.
''' '''
class Config:
frozen = True
shm_name: str # this servers as a "key" value shm_name: str # this servers as a "key" value
shm_first_index_name: str shm_first_index_name: str
shm_last_index_name: str shm_last_index_name: str
@ -126,17 +124,22 @@ class _Token(BaseModel):
return np.dtype(list(map(tuple, self.dtype_descr))).descr return np.dtype(list(map(tuple, self.dtype_descr))).descr
def as_msg(self): def as_msg(self):
return self.dict() return self.to_dict()
@classmethod @classmethod
def from_msg(cls, msg: dict) -> _Token: def from_msg(cls, msg: dict) -> _Token:
if isinstance(msg, _Token): if isinstance(msg, _Token):
return msg return msg
# TODO: native struct decoding
# return _token_dec.decode(msg)
msg['dtype_descr'] = tuple(map(tuple, msg['dtype_descr'])) msg['dtype_descr'] = tuple(map(tuple, msg['dtype_descr']))
return _Token(**msg) return _Token(**msg)
# _token_dec = msgspec.msgpack.Decoder(_Token)
# TODO: this api? # TODO: this api?
# _known_tokens = tractor.ActorVar('_shm_tokens', {}) # _known_tokens = tractor.ActorVar('_shm_tokens', {})
# _known_tokens = tractor.ContextStack('_known_tokens', ) # _known_tokens = tractor.ContextStack('_known_tokens', )
@ -167,7 +170,7 @@ def _make_token(
shm_name=key, shm_name=key,
shm_first_index_name=key + "_first", shm_first_index_name=key + "_first",
shm_last_index_name=key + "_last", shm_last_index_name=key + "_last",
dtype_descr=np.dtype(dtype).descr dtype_descr=tuple(np.dtype(dtype).descr)
) )