Edit: _tracing.py
""" Tracing utils """ from __future__ import annotations from typing import Any from typing import Callable from typing import Sequence from typing import Tuple _Writer = Callable[[str], None] _Processor = Callable[[Tuple[str, ...], Tuple[Any, ...]], None] class TagTracer: def __init__(self) -> None: self._tags2proc: dict[tuple[str, ...], _Processor] = {} self._writer: _Writer | None = None self.indent = 0 def get(self, name: str) -> TagTracerSub: return TagTracerSub(self, (name,)) def _format_message(self, tags: Sequence[str], args: Sequence[object]) -> str: if isinstance(args[-1], dict): extra = args[-1] args = args[:-1] else: extra = {} content = " ".join(map(str, args)) indent = " " * self.indent lines = ["{}{} [{}]\n".format(indent, content, ":".join(tags))] for name, value in extra.items(): lines.append(f"{indent} {name}: {value}\n") return "".join(lines) def _processmessage(self, tags: tuple[str, ...], args: tuple[object, ...]) -> None: if self._writer is not None and args: self._writer(self._format_message(tags, args)) try: processor = self._tags2proc[tags] except KeyError: pass else: processor(tags, args) def setwriter(self, writer: _Writer) -> None: self._writer = writer def setprocessor(self, tags: str | tuple[str, ...], processor: _Processor) -> None: if isinstance(tags, str): tags = tuple(tags.split(":")) else: assert isinstance(tags, tuple) self._tags2proc[tags] = processor class TagTracerSub: def __init__(self, root: TagTracer, tags: tuple[str, ...]) -> None: self.root = root self.tags = tags def __call__(self, *args: object) -> None: self.root._processmessage(self.tags, args) def get(self, name: str) -> TagTracerSub: return self.__class__(self.root, self.tags + (name,))
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