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26 lines
946 B
Python
26 lines
946 B
Python
"""Per-pipeline logging context.
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Each isolated pipeline unit sets the contextvar at thread / asyncio-task entry,
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and every log record emitted from that thread/task is automatically tagged with
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a `[pipeline N] ` prefix via PipelineLogFilter. Non-pipeline-bound code emits
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records with an empty prefix.
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Works for both threading (handler threads) and asyncio (websocket route, send loops)
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because contextvars are per-thread and per-task.
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"""
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import contextvars
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import logging
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from typing import Optional
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pipeline_log_ctx: contextvars.ContextVar[Optional[int]] = contextvars.ContextVar("pipeline_index", default=None)
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class PipelineLogFilter(logging.Filter):
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"""Inject `pipeline_prefix` into every LogRecord based on the current contextvar."""
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def filter(self, record: logging.LogRecord) -> bool:
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idx = pipeline_log_ctx.get()
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record.pipeline_prefix = f"[pipeline {idx}] " if idx is not None else ""
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return True
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