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# -*- test-case-name: twisted.logger.test.test_util -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Logging utilities.
"""
from typing import List
from ._interfaces import LogTrace
from ._logger import Logger
def formatTrace(trace: LogTrace) -> str:
"""
Format a trace (that is, the contents of the C{log_trace} key of a log
event) as a visual indication of the message's propagation through various
observers.
@param trace: the contents of the C{log_trace} key from an event.
@return: A multi-line string with indentation and arrows indicating the
flow of the message through various observers.
"""
def formatWithName(obj: object) -> str:
if hasattr(obj, "name"):
return f"{obj} ({obj.name})" # type: ignore[attr-defined]
else:
return f"{obj}"
result = []
lineage: List[Logger] = []
for parent, child in trace:
if not lineage or lineage[-1] is not parent:
if parent in lineage:
while lineage[-1] is not parent:
lineage.pop()
else:
if not lineage:
result.append(f"{formatWithName(parent)}\n")
lineage.append(parent)
result.append(" " * len(lineage))
result.append(f"-> {formatWithName(child)}\n")
return "".join(result)
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