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Nanaloveyuki
162 lines
5.0 KiB
Markdown
162 lines
5.0 KiB
Markdown
<html>
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<div style="display: flex; justify-content: center; align-items: center; height: 15vh;">
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<h3 title="https://moonbitlang.github.io/OSC2026/index.html#top">2026 MoonBit 国产基础软件生态开源大赛参赛作品</h3>
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</div>
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<div style="display: flex; justify-content: center; align-items: center; height: 8vh;">
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<a href="https://mooncakes.io/docs/Nanaloveyuki/BitLogger" title="点击前往 Mooncake 页面"><b>Mooncake@Nanaloveyuki/BitLogger</b></a>
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</div>
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<div style="display: flex; justify-content: center; align-items: center; height: 2vh;">
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<b>中文 | <a href="./docs/README-en.md">English</a></b>
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</div>
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</html>
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## 📖 介绍
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BitLogger 是一个基于 MoonBit 编写的结构化日志库。
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## ❇️ 特点
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- 🧩 核心能力清晰：先把 logging core 做稳，再继续扩展 rotation/async 等能力。
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- 🏗️ 结构明确：按 `level / record / formatter / sinks / logger / global` 拆文件，便于继续维护。
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- 🔌 可扩展：支持 `fanout_sink(...)` 和 `callback_sink(...)`，方便后续桥接文件、指标或外部系统。
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- 🧱 可组合：支持 `buffered_sink(...)` 和 `filter_sink(...)`，可以在不引入复杂 runtime 的前提下组合输出策略。
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- 🔎 可复用过滤：提供 `target_has_prefix(...)`、`message_contains(...)`、`level_at_least(...)`、`field_equals(...)` 等过滤辅助函数。
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- 🩹 可变换 Record：支持 `with_patch(...)`、`patch_sink(...)` 与脱敏/补字段/message 变换 helper。
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- 📮 显式队列：支持 `queued_sink(...)` / `with_queue(...)`、有界积压与溢出策略，作为后续 async sink 的 runtime-safe 基础。
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- 🧾 可配置文本格式：支持 `text_formatter(...)`、`format_text(...)`、`text_console_sink(...)` 和 `formatted_callback_sink(...)`。
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- 💾 Native 文件输出：支持 `file_sink(...)`，但当前仅保证 `native/llvm` backend 可用。
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- 📦 面向 MoonBit：API 和工程结构围绕 MoonBit 的 package / visibility / toolchain 现实约束设计。
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## 🚀 快速开始
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```moonbit
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let logger = Logger::new(console_sink(), min_level=Level::Info, target="demo")
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.with_timestamp()
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.with_context_fields([field("service", "bitlogger")])
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logger.info("starting", fields=[field("port", "8080")])
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```
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<details><summary>层级 target 示例</summary>
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```moonbit
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let worker = Logger::new(console_sink(), target="app").child("worker")
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worker.info("job ready")
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```
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</details>
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<details><summary>自定义 callback sink 示例</summary>
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```moonbit
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let hook = Logger::new(
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callback_sink(fn(rec) {
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println("callback saw [\{rec.target}] \{rec.message}")
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}),
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target="hook",
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)
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hook.info("hello")
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```
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</details>
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<details><summary>基础 buffered sink 示例</summary>
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```moonbit
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let sink = buffered_sink(console_sink(), flush_limit=2)
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let logger = Logger::new(sink, target="buffered")
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logger.info("one")
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logger.info("two")
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sink.flush()
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```
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</details>
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<details><summary>基础 filter sink 示例</summary>
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```moonbit
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let sink = filter_sink(console_sink(), fn(rec) {
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rec.target == "kept"
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})
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let kept = Logger::new(sink, target="kept")
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let dropped = Logger::new(sink, target="dropped")
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kept.info("visible")
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dropped.info("hidden")
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```
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</details>
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<details><summary>Logger 链式 filter 示例</summary>
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```moonbit
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let logger = Logger::new(console_sink(), target="service")
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.with_filter(all_of([
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target_has_prefix("service"),
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message_contains("visible"),
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]))
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logger.info("hidden")
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logger.child("api").info("visible")
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```
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</details>
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<details><summary>Record patch 示例</summary>
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```moonbit
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let logger = Logger::new(console_sink(), target="auth")
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.with_patch(compose_patches([
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prefix_message("[safe] "),
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redact_fields(["token"]),
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append_fields([field("service", "bitlogger")]),
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]))
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logger.info("login", fields=[field("user", "alice"), field("token", "secret")])
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```
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</details>
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<details><summary>显式 queue sink 示例</summary>
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```moonbit
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let logger = Logger::new(console_sink(), target="queue")
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.with_queue(max_pending=2, overflow=QueueOverflowPolicy::DropOldest)
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logger.info("one")
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logger.info("two")
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logger.info("three")
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ignore(logger.sink.flush())
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```
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</details>
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<details><summary>自定义文本 formatter 示例</summary>
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```moonbit
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let formatter = text_formatter(show_timestamp=false, separator=" | ")
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let logger = Logger::new(text_console_sink(formatter), target="pretty")
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logger.info("hello", fields=[field("mode", "pretty")])
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```
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</details>
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<details><summary>native 文件 sink 示例</summary>
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```moonbit
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if native_files_supported() {
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let logger = Logger::new(file_sink("bitlogger.log"), target="file")
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logger.info("hello", fields=[field("kind", "file")])
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ignore(logger.sink.flush())
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ignore(logger.sink.close())
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}
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```
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</details>
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## 📂 仓库结构
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- `bitlogger/`：MoonBit 库 package，本体实现、测试与 Mooncake README
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- `examples/basic/`：最小可运行示例
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## 🔗 相关文档
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- [Mooncake 文档页](https://mooncakes.io/docs/Nanaloveyuki/BitLogger)
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- [English README](./docs/README-en.md)
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