forked from goodboy/tractor
Bring in pretty-ified `msgspec.Struct` extension
Originally designed and used throughout `piker`, the subtype adds some handy pprinting and field diffing extras often handy when viewing struct types in logging or REPL console interfaces B) Obvi this rejigs the `tractor.msg` mod into a sub-pkg and moves the existing namespace obj-pointer stuff into a new `.msg.ptr` sub mod.multihomed
Tyler Goodlet
parent
35b0c4bef0
commit
df641d9d31
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@ -0,0 +1,26 @@
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# tractor: structured concurrent "actors".
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# Copyright 2018-eternity Tyler Goodlet.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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'''
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Built-in messaging patterns, types, APIs and helpers.
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'''
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from .ptr import (
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NamespacePath as NamespacePath,
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)
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from .types import (
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Struct as Struct,
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)
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@ -15,7 +15,7 @@
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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'''
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Built-in messaging patterns, types, APIs and helpers.
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IPC-compat cross-mem-boundary object pointer.
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'''
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@ -0,0 +1,251 @@
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# tractor: structured concurrent "actors".
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# Copyright 2018-eternity Tyler Goodlet.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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'''
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Extensions to built-in or (heavily used but 3rd party) friend-lib
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types.
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'''
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from __future__ import annotations
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from collections import UserList
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from pprint import (
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saferepr,
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)
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from typing import (
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Any,
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Iterator,
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)
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from msgspec import (
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msgpack,
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Struct as _Struct,
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structs,
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)
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class DiffDump(UserList):
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'''
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Very simple list delegator that repr() dumps (presumed) tuple
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elements of the form `tuple[str, Any, Any]` in a nice
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multi-line readable form for analyzing `Struct` diffs.
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'''
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def __repr__(self) -> str:
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if not len(self):
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return super().__repr__()
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# format by displaying item pair's ``repr()`` on multiple,
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# indented lines such that they are more easily visually
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# comparable when printed to console when printed to
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# console.
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repstr: str = '[\n'
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for k, left, right in self:
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repstr += (
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f'({k},\n'
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f'\t{repr(left)},\n'
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f'\t{repr(right)},\n'
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')\n'
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)
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repstr += ']\n'
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return repstr
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class Struct(
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_Struct,
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# https://jcristharif.com/msgspec/structs.html#tagged-unions
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# tag='pikerstruct',
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# tag=True,
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):
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'''
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A "human friendlier" (aka repl buddy) struct subtype.
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'''
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def _sin_props(self) -> Iterator[
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tuple[
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structs.FieldIinfo,
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str,
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Any,
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]
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]:
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'''
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Iterate over all non-@property fields of this struct.
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'''
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fi: structs.FieldInfo
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for fi in structs.fields(self):
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key: str = fi.name
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val: Any = getattr(self, key)
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yield fi, key, val
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def to_dict(
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self,
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include_non_members: bool = True,
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) -> dict:
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'''
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Like it sounds.. direct delegation to:
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https://jcristharif.com/msgspec/api.html#msgspec.structs.asdict
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BUT, by default we pop all non-member (aka not defined as
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struct fields) fields by default.
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'''
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asdict: dict = structs.asdict(self)
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if include_non_members:
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return asdict
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# only return a dict of the struct members
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# which were provided as input, NOT anything
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# added as type-defined `@property` methods!
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sin_props: dict = {}
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fi: structs.FieldInfo
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for fi, k, v in self._sin_props():
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sin_props[k] = asdict[k]
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return sin_props
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def pformat(
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self,
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field_indent: int = 2,
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indent: int = 0,
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) -> str:
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'''
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Recursion-safe `pprint.pformat()` style formatting of
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a `msgspec.Struct` for sane reading by a human using a REPL.
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'''
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# global whitespace indent
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ws: str = ' '*indent
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# field whitespace indent
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field_ws: str = ' '*(field_indent + indent)
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# qtn: str = ws + self.__class__.__qualname__
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qtn: str = self.__class__.__qualname__
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obj_str: str = '' # accumulator
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fi: structs.FieldInfo
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k: str
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v: Any
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for fi, k, v in self._sin_props():
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# TODO: how can we prefer `Literal['option1', 'option2,
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# ..]` over .__name__ == `Literal` but still get only the
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# latter for simple types like `str | int | None` etc..?
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ft: type = fi.type
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typ_name: str = getattr(ft, '__name__', str(ft))
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# recurse to get sub-struct's `.pformat()` output Bo
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if isinstance(v, Struct):
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val_str: str = v.pformat(
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indent=field_indent + indent,
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field_indent=indent + field_indent,
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)
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else: # the `pprint` recursion-safe format:
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# https://docs.python.org/3.11/library/pprint.html#pprint.saferepr
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val_str: str = saferepr(v)
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obj_str += (field_ws + f'{k}: {typ_name} = {val_str},\n')
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return (
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f'{qtn}(\n'
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f'{obj_str}'
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f'{ws})'
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)
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# TODO: use a pprint.PrettyPrinter instance around ONLY rendering
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# inside a known tty?
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# def __repr__(self) -> str:
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# ...
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# __str__ = __repr__ = pformat
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__repr__ = pformat
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def copy(
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self,
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update: dict | None = None,
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) -> Struct:
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'''
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Validate-typecast all self defined fields, return a copy of
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us with all such fields.
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NOTE: This is kinda like the default behaviour in
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`pydantic.BaseModel` except a copy of the object is
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returned making it compat with `frozen=True`.
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'''
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if update:
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for k, v in update.items():
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setattr(self, k, v)
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# NOTE: roundtrip serialize to validate
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# - enode to msgpack binary format,
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# - decode that back to a struct.
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return msgpack.Decoder(type=type(self)).decode(
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msgpack.Encoder().encode(self)
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)
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def typecast(
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self,
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# TODO: allow only casting a named subset?
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# fields: set[str] | None = None,
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) -> None:
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'''
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Cast all fields using their declared type annotations
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(kinda like what `pydantic` does by default).
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NOTE: this of course won't work on frozen types, use
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``.copy()`` above in such cases.
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'''
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# https://jcristharif.com/msgspec/api.html#msgspec.structs.fields
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fi: structs.FieldInfo
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for fi in structs.fields(self):
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setattr(
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self,
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fi.name,
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fi.type(getattr(self, fi.name)),
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)
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def __sub__(
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self,
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other: Struct,
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) -> DiffDump[tuple[str, Any, Any]]:
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'''
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Compare fields/items key-wise and return a ``DiffDump``
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for easy visual REPL comparison B)
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'''
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diffs: DiffDump[tuple[str, Any, Any]] = DiffDump()
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for fi in structs.fields(self):
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attr_name: str = fi.name
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ours: Any = getattr(self, attr_name)
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theirs: Any = getattr(other, attr_name)
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if ours != theirs:
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diffs.append((
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attr_name,
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ours,
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theirs,
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))
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return diffs
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