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