NixOS/nix

C API: Logging callbacks

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#11,036 创建于 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.

贡献者指南

技术栈
ccpp
领域
backendobservability
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
3-5 days
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
blocked
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
C programmingNix internalscallback design patterns
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
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.