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<html> # BitLogger
<div style="display: flex; justify-content: center; align-items: center; height: 15vh;">
<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>
</div>
<div style="display: flex; justify-content: center; align-items: center; height: 8vh;">
<a href="https://mooncakes.io/docs/Nanaloveyuki/BitLogger" title="点击前往 Mooncake 页面"><b>Mooncake@Nanaloveyuki/BitLogger</b></a>
</div>
<div style="display: flex; justify-content: center; align-items: center; height: 2vh;">
<b>中文 | <a href="./docs/README-en.md">English</a></b>
</div>
</html>
## 📖 介绍 BitLogger 是一个使用 MoonBit 编写的结构化日志库，适合命令行工具、服务和需要统一日志输出的项目。
BitLogger 是一个使用 MoonBit 编写的结构化日志库，目标是提供可组合、可配置、可跨端编译的日志基础设施。 - [Mooncake 文档页](https://mooncakes.io/docs/Nanaloveyuki/BitLogger)
- [English README](./docs/README-en.md)
## 🧭 后端兼容 ## 介绍
当前仓库已验证目标：`native`、`js`、`wasm`、`wasm-gc`。 BitLogger 提供统一的日志级别、目标名、结构化字段和可定制格式，既可以直接输出到控制台，也可以在 native 环境写入文件，并提供异步日志版本。
`llvm` 目前仍应视为实验性目标：当前环境未完成验证，本地复核依赖 nightly / llvm toolchain 条件，现阶段不作为与 `native` 同等级的稳定承诺。 ## 快速开始
| 模块 / 能力 | 已验证目标 | `llvm` |
| --- | --- | --- |
| `src` 主包 | `native`、`js`、`wasm`、`wasm-gc` 已验证 | 实验性；当前环境未完成验证 |
| `file(...)` / `file_sink(...)` | 仅 `native` 已验证；非 native 下不支持，`native_files_supported()` 返回 `false` | 不作为已验证能力声明 |
| `src-async` | `native`、`wasm` 已本地复核通过；其余非 native 仍按兼容实现表述 | 实验性；当前环境未完成验证 |
| portable examples (`console_basic` / `text_formatter` / `style_tags` / `config_build` / `presets`) | `native`、`wasm-gc` 已验证 | 当前未完成验证 |
| `examples/file_rotation` | `native` 已验证；非 native 会清晰提示 file sink 不可用 | 当前未完成验证 |
| `examples/async_basic` | `native` 已验证；非 native 受 `async fn main` 入口限制, 当前不提供 | 当前未完成验证 |
## ❇️ 关键特性
- 结构化日志基础能力：level、record、formatter、sink、target、context field。
- 组合式设计：支持 filter、patch、fanout、split、callback、queued sink 等组合能力。
- 配置驱动：支持 JSON 配置解析、导出与 `build_logger(...)` / `build_async_logger(...)` 运行时组装。
- 文本格式化：支持 `text_formatter(...)`、template、style tag、`color_mode` / `style_markup`。
- Native 文件输出：支持 file sink、基础 size rotation、reopen、failure counter 与运行时状态读取。
- 异步层：提供独立 `src-async` package，支持 queue、worker lifecycle、runtime state 和跨端兼容实现。
## 🚀 快速开始
```moonbit ```moonbit
let logger = build_logger( let logger = build_logger(
with_queue( text_console(
text_console( min_level=Level::Info,
min_level=Level::Info, target="demo",
target="demo", text_formatter=TextFormatterConfig::new(show_timestamp=false, separator=" | "),
text_formatter=TextFormatterConfig::new(show_timestamp=false, separator=" | "),
),
max_pending=32,
overflow=QueueOverflowPolicy::DropOldest,
), ),
) )
@@ -57,42 +24,39 @@ logger.info("starting", fields=[field("port", "8080")])
ignore(logger.flush()) ignore(logger.flush())
``` ```
推荐先从 `presets + build_logger(...)` 路径开始：`console(...)` / `json_console(...)` / `text_console(...)` / `file(...)` 负责拼装 `LoggerConfig`，`with_queue(...)` / `with_file_rotation(...)` 负责做小范围组合，然后再交给 `build_logger(...)` 构建运行时 logger。 推荐从 `console(...)`、`json_console(...)`、`text_console(...)`、`file(...)` 这几个入口开始，再按需配合 `with_queue(...)` 或 `with_file_rotation(...)`。
当你需要 `fanout`、`split`、`callback`、`patch` 这类自定义 sink 图组合时，再优先使用 `Logger::new(...)` 直接进行运行时拼装。 如果你需要自己组合 sink，比如 `fanout`、`split`、`callback`，再使用 `Logger::new(...)`。
跨端优先时，优先选择 console / json_console / text_console / config parser 这类 portable surface；file sink / file preset 仍然是 native 能力，建议先用 `native_files_supported()` 做能力判断。 ## 支持情况
异步入口示例： - 当前已验证目标：`native`、`js`、`wasm`、`wasm-gc`
- `llvm` 目前按实验性目标处理，当前环境未完成验证
- 文件输出是 native 能力；跨端代码里建议先判断 `native_files_supported()`
- `src-async` 可用，但示例 `examples/async_basic` 目前仍按 native 入口提供
```moonbit ## 主要能力
let logger = async_logger(console_sink(), target="async.demo")
@async.with_task_group(group => {
group.spawn_bg(() => logger.run())
logger.info("started")
logger.shutdown()
})
```
## 📂 仓库结构 - 结构化日志：level、target、message、fields
- 多种输出方式：console、json console、text console、file
- 可定制文本格式：模板、style tag、颜色控制
- 配置驱动构建：`build_logger(...)`、`build_async_logger(...)`
- 组合能力：queue、filter、patch、fanout、split、callback
- 异步日志：独立 `src-async` package
- `src/`: 主日志库 package。 ## 示例
- `src-async/`: 基于 `moonbitlang/async` 的异步日志层。
- `docs/api/`: 单接口粒度 API 文档。
- `examples/basic/`: breadth 示例；文件开头就是推荐的 presets + `build_logger(...)` 同步入口，后续继续覆盖更广能力面。
- `examples/console_basic/`: portable 的 console 与 json console 最小输出示例。
- `examples/text_formatter/`: portable 的 text formatter / template 示例。
- `examples/style_tags/`: portable 的 style tag / colored formatter 示例。
- `examples/file_rotation/`: target-sensitive 的 file sink / rotation 示例，非 native 会直接提示跳过原因。
- `examples/config_build/`: portable 的 `build_logger(...)` 配置驱动示例。
- `examples/presets/`: portable-first 的 presets + `build_logger(...)` 示例；native 下额外演示 file preset。
- `examples/async_basic/`: native-only 异步 logger 示例，并说明限制来自 `async fn main` 入口而不是 `src-async` API 缺失。
## 🔗 文档入口 - `examples/console_basic/`：最小 console / json console 示例
- `examples/text_formatter/`：文本格式与模板示例
- `examples/style_tags/`：style tag 与彩色输出示例
- `examples/config_build/`：配置构建示例
- `examples/presets/`：常用预设组合示例
- `examples/file_rotation/`：文件输出与轮转示例，仅适用于 native
- `examples/async_basic/`：异步日志示例
## 文档
- [Mooncake 文档页](https://mooncakes.io/docs/Nanaloveyuki/BitLogger)
- [English README](./docs/README-en.md)
- [src package README](./src/README.mbt.md)
- [API 索引](./docs/api/index.md) - [API 索引](./docs/api/index.md)
- 推荐起步 API: `text_console(...)` / `file(...)` / `with_queue(...)` / `build_logger(...)` - [src package README](./src/README.mbt.md)
- facade API: `build_application_logger(...)` / `build_library_logger(...)` / `build_application_async_logger(...)`
常用入口：`text_console(...)`、`file(...)`、`with_queue(...)`、`build_logger(...)`、`build_async_logger(...)`
docs/README-en.md
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# BitLogger # BitLogger
BitLogger is a structured logging library written in MoonBit. BitLogger is a structured logging library for MoonBit projects.
This README focuses on project positioning, core capabilities, and entry points. Detailed API coverage now lives in `docs/api/`. - [Mooncake package page](https://mooncakes.io/docs/Nanaloveyuki/BitLogger)
- [Chinese README](../README.md)
## Overview ## Overview
BitLogger is designed to provide composable, configurable, and cross-target logging infrastructure for MoonBit projects. BitLogger gives you consistent levels, targets, structured fields, configurable text output, native file logging, and an async logging layer.
## Backend Compatibility
Currently verified targets: `native`, `js`, `wasm`, and `wasm-gc`.
`llvm` should still be treated as experimental here: verification did not complete in the current environment, and local reproduction depends on nightly / llvm toolchain conditions, so it is not presented as a stable promise at the same level as `native`.
| Module / capability | Verified targets | `llvm` |
| --- | --- | --- |
| `src` core package | Verified on `native`, `js`, `wasm`, and `wasm-gc` | Experimental; not fully verified in the current environment |
| `file(...)` / `file_sink(...)` | Verified only on `native`; unavailable on non-native targets and `native_files_supported()` returns `false` | Not presented as a verified capability |
| `src-async` | Local verification passed on `native` and `wasm`; other non-native targets still follow the compatibility-implementation wording | Experimental; not fully verified in the current environment |
| portable examples (`console_basic` / `text_formatter` / `style_tags` / `config_build` / `presets`) | Verified on `native` and `wasm-gc` | Not yet verified here |
| `examples/file_rotation` | Verified on `native`; non-native targets print a clear skip message because file sinks are unavailable | Not yet verified here |
| `examples/async_basic` | Verified on `native`; non-native example shipping is still limited by the current `async fn main` entry path | Not yet verified here |
## Key Features
- Structured logging with levels, targets, and key-value fields.
- Composable sinks, filters, patches, fanout, routing, and queue wrappers.
- Config-driven runtime assembly through JSON parse/export helpers and `build_logger(...)` / `build_async_logger(...)`.
- Configurable text formatting with templates, style tags, and color control.
- Native file sink support with basic rotation, reopen helpers, and runtime observability.
- Separate async layer with bounded queueing, worker lifecycle control, runtime state, and cross-target compatibility.
## Quick Start ## Quick Start
```moonbit ```moonbit
let logger = build_logger( let logger = build_logger(
with_queue( text_console(
text_console( min_level=Level::Info,
min_level=Level::Info, target="demo",
target="demo", text_formatter=TextFormatterConfig::new(show_timestamp=false, separator=" | "),
text_formatter=TextFormatterConfig::new(show_timestamp=false, separator=" | "),
),
max_pending=32,
overflow=QueueOverflowPolicy::DropOldest,
), ),
) )
@@ -51,54 +24,39 @@ logger.info("starting", fields=[field("port", "8080")])
ignore(logger.flush()) ignore(logger.flush())
``` ```
Start new synchronous code with `presets + build_logger(...)`: use `console(...)`, `json_console(...)`, `text_console(...)`, or `file(...)` to assemble `LoggerConfig`, optionally extend it with `with_queue(...)` or `with_file_rotation(...)`, then call `build_logger(...)`. Start with `console(...)`, `json_console(...)`, `text_console(...)`, or `file(...)`, then add `with_queue(...)` or `with_file_rotation(...)` only when needed.
Switch to `Logger::new(...)` when you need direct runtime sink composition such as `fanout`, `split`, `callback`, or custom patch/filter graphs. Use `Logger::new(...)` when you want to assemble custom sink graphs directly.
For cross-target code, prefer the console, json console, text console, and config-parser paths first. File sinks and file presets remain native-sensitive and should be gated with `native_files_supported()`. ## Support Status
Async entry example: - Currently verified targets: `native`, `js`, `wasm`, `wasm-gc`
- `llvm` is still treated as experimental in the current release context
- File output is a native capability; check `native_files_supported()` in cross-target code
- `src-async` is available, while `examples/async_basic` is still shipped as a native entry example
```moonbit ## Main Features
let logger = async_logger(console_sink(), target="async.demo")
@async.with_task_group(group => {
group.spawn_bg(() => logger.run())
logger.info("started")
logger.shutdown()
})
```
## Repository Layout - Structured logs with levels, targets, messages, and fields
- Multiple outputs: console, JSON console, text console, and file
- Custom text formatting with templates, style tags, and color control
- Config-based builders: `build_logger(...)` and `build_async_logger(...)`
- Composition helpers: queue, filter, patch, fanout, split, callback
- Separate async package under `src-async`
- `src/`: core logging package. ## Examples
- `src-async/`: async logging layer built on `moonbitlang/async`.
- `docs/api/`: one-file-per-interface API documentation.
- `examples/basic/`: breadth example; starts with the recommended presets-based sync path and then sweeps broader capabilities.
- `examples/console_basic/`: portable minimal console and JSON console output.
- `examples/text_formatter/`: portable text formatter and template example.
- `examples/style_tags/`: portable style tag and colored formatter example.
- `examples/file_rotation/`: target-sensitive file sink and rotation example with an explicit non-native skip path.
- `examples/config_build/`: portable config-driven `build_logger(...)` example.
- `examples/presets/`: portable-first presets example; adds file preset usage only when native file support is available.
- `examples/async_basic/`: native-only async logger example; the limitation is the `async fn main` entry path, not the absence of `src-async` compatibility APIs.
## Documentation Entry Points - `examples/console_basic/`: minimal console and JSON console example
- `examples/text_formatter/`: text formatting and template example
- `examples/style_tags/`: style tags and colored output example
- `examples/config_build/`: config-based build example
- `examples/presets/`: common preset combinations
- `examples/file_rotation/`: native file logging and rotation example
- `examples/async_basic/`: async logging example
- [Mooncake package page](https://mooncakes.io/docs/Nanaloveyuki/BitLogger) ## Documentation
- [Chinese README](../README.md)
- [API index](./api/index.md)
- [src package README](../src/README.mbt.md) - [src package README](../src/README.mbt.md)
- Recommended sync starting APIs: `text_console(...)`, `file(...)`, `with_queue(...)`, `build_logger(...)`
- Selected API docs in `docs/api/`:
- [logger-new.md](./api/logger-new.md)
- [async-logger.md](./api/async-logger.md)
- [build-logger.md](./api/build-logger.md)
- [build-async-logger.md](./api/build-async-logger.md)
- [build-application-logger.md](./api/build-application-logger.md)
- [build-library-logger.md](./api/build-library-logger.md)
- [build-application-async-logger.md](./api/build-application-async-logger.md)
## Notes Common entry points: `text_console(...)`, `file(...)`, `with_queue(...)`, `build_logger(...)`, `build_async_logger(...)`
- `docs/README-en.md` no longer acts as an API catalog.
- Detailed API references, config fields, runtime control helpers, and lifecycle surfaces now live under `docs/api/`.
- For concrete runnable flows, prefer `examples/`.