NixOS/nix

C API: Logging callbacks

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#11,036 建立於 2024年7月4日

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描述

It would be ideal to have isolated logging streams that would be associated with either an evaluator state, or store, or a context. By logs I mean output from builtins.trace and from builders.

At the moment it would be a nice feature for me but if I find I really need it then I might attempt to implement it myself.

Priorities

Add :+1: to issues you find important.

貢獻者指南

技術棧
ccpp
領域
backendobservability
議題類型
feature
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
3-5 days
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
blocked
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
C programmingNix internalscallback design patterns
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
20
研究方向
Investigate existing logging structure in the Nix C API, particularly how `builtins.trace` and builder output are currently handled. Look at files like `src/libnixstore/eval.cc` and `src/libexpr/primops.cc`. Review comments on issue #11036 for design discussions. Propose a callback function signature that allows users to register custom logging handlers, possibly associated with evaluator state, store, or context.