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Nanaloveyuki
321 lines
16 KiB
Markdown
321 lines
16 KiB
Markdown
# BitLogger
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BitLogger is a minimal structured logger for MoonBit.
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BitLogger 是一个使用 MoonBit 编写的结构化日志库.
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## Features / 特性
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- log levels: `Trace`, `Debug`, `Info`, `Warn`, `Error`
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- 日志级别: `Trace`, `Debug`, `Info`, `Warn`, `Error`
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- structured key-value fields
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- 结构化字段: `field("key", "value")`
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- sink abstraction
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- sink 抽象与组合接口
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- default global console logger
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- 默认全局 logger 辅助函数
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- context fields via `with_context_fields(...)`
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- 通过 `with_context_fields(...)` 添加上下文字段
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- child target composition via `child(...)`
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- 通过 `child(...)` 组合层级 target
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- optional timestamps via `with_timestamp()`
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- 通过 `with_timestamp()` 启用时间戳
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- JSON console output via `json_console_sink()`
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- `json_console_sink()` 提供 JSON 控制台输出
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- sink composition via `fanout_sink(...)`
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- `fanout_sink(...)` 支持多 sink 组合
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- sink routing via `split_sink(...)` and `split_by_level(...)`
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- `split_sink(...)`, `split_by_level(...)` 支持按谓词或 level 将日志路由到不同 sink
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- custom callback sink via `callback_sink(...)`
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- `callback_sink(...)` 支持自定义外部集成
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- buffered sink via `buffered_sink(...)`
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- `buffered_sink(...)` 支持内存缓冲与 flush
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- filter sink via `filter_sink(...)`
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- `filter_sink(...)` 支持按 `Record` 条件筛选输出
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- reusable filter helpers such as `target_has_prefix(...)`, `message_contains(...)`, and `field_equals(...)`
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- 提供 `target_has_prefix(...)`, `message_contains(...)`, `field_equals(...)` 等可复用过滤辅助函数
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- record patching via `with_patch(...)` and `patch_sink(...)`
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- 支持 `with_patch(...)`, `patch_sink(...)` 以及常见 record patch helper
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- context binding via `bind(...)` and `fields(...)`
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- 支持 `bind(...)`, `fields(...)`, 更方便封装上下文字段
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- explicit queued delivery via `queued_sink(...)` and `with_queue(...)`
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- 支持 `queued_sink(...)`, `with_queue(...)`, 有界积压与溢出策略
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- configurable text formatting via `text_formatter(...)`, `format_text(...)`, `text_console_sink(...)`, and template-driven `template` output
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- 支持 `text_formatter(...)`, `format_text(...)`, `text_console_sink(...)` 以及模板化 `template` 文本输出
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- lightweight style tags via `color_mode`, inline markup, `TextStyle`, `StyleTagRegistry`, custom tags, and builtin-tag overrides
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- 支持 `color_mode`, inline markup, `TextStyle`, `StyleTagRegistry`, 自定义标签与内置标签覆盖
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- JSON config parsing via `parse_logger_config_text(...)` and `stringify_logger_config(...)`
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- 支持 `parse_logger_config_text(...)`, `stringify_logger_config(...)` 进行最小 JSON 配置读写
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- `TextFormatter` / `TextFormatterConfig` now support `color_mode = Never | Auto | Always`
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- `TextFormatter` / `TextFormatterConfig` 现支持 `color_mode = Never | Auto | Always`
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- `QueueConfig` / `TextFormatterConfig` / `SinkConfig` can also be exported independently through dedicated JSON helpers
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- `QueueConfig` / `TextFormatterConfig` / `SinkConfig` 也可分别通过专用 JSON helper 单独导出
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- config-driven logger assembly via `build_logger(...)`
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- 支持 `build_logger(...)` 将配置组装为可直接使用的 logger
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- native-only file output via `file_sink(...)`, with basic size rotation, backup retention, explicit `reopen()` / `reopen_with_current_policy()` / `reopen_append()` / `reopen_truncate()`, and failure counters
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- 支持 `file_sink(...)`, 基础 size rotation / backup retention, 显式 `reopen()` / `reopen_with_current_policy()` / `reopen_append()` / `reopen_truncate()` 与失败计数, 仅在 `native/llvm` backend 可用
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## Example / 示例
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```mbt check
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test {
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let logger = Logger::new(console_sink(), min_level=Level::Debug, target="demo")
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.with_timestamp()
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logger.info("starting", fields=[field("port", "8080")])
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}
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```
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```mbt check
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test {
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let logger = Logger::new(console_sink(), target="app").child("worker")
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logger.info("ready")
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}
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```
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```mbt check
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test {
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let logger = Logger::new(
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fanout_sink(console_sink(), json_console_sink()),
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min_level=Level::Info,
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target="demo",
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)
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logger.info("ready", fields=[field("mode", "fanout")])
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}
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```
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```mbt check
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test {
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let logger = 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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logger.info("hello")
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}
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```
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```mbt check
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test {
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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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```
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```mbt check
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test {
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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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```
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```mbt check
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test {
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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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```
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```mbt check
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test {
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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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```
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```mbt check
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test {
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let logger = Logger::new(console_sink(), target="audit")
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.bind(fields([("service", "bitlogger"), ("scope", "login")]))
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logger.info("accepted", fields=[field("user", "alice")])
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}
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```
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```mbt check
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test {
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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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```
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```mbt check
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test {
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let logger = Logger::new(
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split_by_level(
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callback_sink(fn(rec) {
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println("high priority: \{rec.level.label()} \{rec.message}")
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}),
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console_sink(),
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min_level=Level::Warn,
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),
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min_level=Level::Trace,
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target="split",
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)
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logger.info("normal output")
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logger.warn("warning output")
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}
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```
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```mbt check
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test {
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let formatter = text_formatter(
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show_timestamp=false,
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field_separator=",",
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template="[{level}] {target} {message} :: {fields}",
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color_mode=ColorMode::Always,
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)
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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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```
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```mbt check
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test {
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let formatter = text_formatter(
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show_timestamp=false,
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color_mode=ColorMode::Always,
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).with_style_tags(
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default_style_tag_registry()
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.set_tag("accent", fg=Some("#4cc9f0"), bold=true)
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.define_alias("danger", "red"),
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)
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let logger = Logger::new(text_console_sink(formatter), target="styled")
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logger.info("<accent>styled</> output and <danger>alert</>")
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}
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```
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```mbt check
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test {
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let formatter = text_formatter(
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color_mode=ColorMode::Always,
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).without_style_markup()
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let logger = Logger::new(text_console_sink(formatter), target="raw")
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logger.info("<red>kept as raw text</>")
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}
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```
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```mbt check
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test {
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let config = parse_logger_config_text(
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"{\"min_level\":\"debug\",\"target\":\"config.demo\",\"timestamp\":true,\"sink\":{\"kind\":\"text_console\",\"text_formatter\":{\"show_timestamp\":false,\"field_separator\":\",\",\"template\":\"[{level}] {target} {message} :: {fields}\",\"color_mode\":\"always\"}},\"queue\":{\"max_pending\":2,\"overflow\":\"DropOldest\"}}",
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)
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let logger = build_logger(config)
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logger.info("configured from json")
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ignore(logger.flush())
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}
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```
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```mbt check
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test {
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let config = parse_logger_config_text(
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"{\"sink\":{\"kind\":\"text_console\",\"text_formatter\":{\"show_timestamp\":false,\"color_mode\":\"always\",\"style_tags\":{\"accent\":{\"fg\":\"#4cc9f0\",\"bold\":true}}}}}",
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)
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let logger = build_logger(config)
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logger.info("<accent>styled from json</>")
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}
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```
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```mbt check
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test {
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let config = parse_logger_config_text(
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"{\"sink\":{\"kind\":\"text_console\",\"text_formatter\":{\"color_mode\":\"always\",\"style_markup\":\"disabled\"}}}",
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)
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let logger = build_logger(config)
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logger.info("<red>still raw</>")
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}
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```
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## Formatter Template / 模板格式
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- supported tokens / 支持的 token: `{timestamp}`, `{timestamp_ms}`, `{level}`, `{target}`, `{message}`, `{fields}`
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- `color_mode` / `color_mode`: `never`, `auto`, `always`
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- `style_markup` / `style_markup`: `disabled`, `builtin`, `full`
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- inline style tags / inline 样式标签: `<red>...</>`, `<b>...</>`, `<#ff0000>...</>`, `<bg:#202020>...</>`
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- runtime style tags / 运行期样式标签: `TextStyle`, `StyleTagRegistry`, `style_tag_registry()`, `default_style_tag_registry()`, `set_tag(...)`, `define_alias(...)`
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- style tag priority / 标签优先级: formatter local `style_tags` > global style tag registry > builtin tags
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- `sink.text_formatter.style_tags` / `sink.text_formatter.style_tags` 现支持最小对象映射: `fg`, `bg`, `bold`, `dim`, `italic`, `underline`
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- `define_alias(...)` is still runtime-only / `define_alias(...)` 目前仍为运行期 API
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- disabled or missing parts render as empty text / 被关闭或缺失的部分会渲染为空字符串
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- `template` is intentionally a simple token replacement layer, not a full DSL / `template` 使用轻量 token 替换方式, 不是完整 DSL
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```mbt check
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test {
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if native_files_supported() {
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let logger = Logger::new(
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file_sink("bitlogger.log", rotation=Some(file_rotation(128, max_backups=2))),
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target="file",
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)
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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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```
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```mbt check
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test {
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let logger = build_logger(
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LoggerConfig::new(
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sink=SinkConfig::new(kind=SinkKind::File, path="bitlogger-runtime.log"),
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queue=Some(QueueConfig::new(16)),
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),
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)
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logger.info("queued hello")
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match logger.file_runtime_state() {
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Some(snapshot) => println(stringify_runtime_file_state(snapshot, pretty=true))
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None => ()
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}
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}
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```
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## File Rotation / 文件轮转
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- basic rotation is size-based / 基础轮转按文件大小触发
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- `file_rotation(max_bytes, max_backups=...)` controls threshold and retained backups / `file_rotation(max_bytes, max_backups=...)` 控制触发阈值和保留备份数
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- JSON config uses `sink.rotation.max_bytes` and `sink.rotation.max_backups` / JSON 配置使用 `sink.rotation.max_bytes` 与 `sink.rotation.max_backups`
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- `FileSink::reopen()` can explicitly reopen the current file handle, `FileSink::reopen_with_current_policy()` makes the stored-policy reopen path explicit, and `FileSink::reopen_append()` / `FileSink::reopen_truncate()` cover the two common reopen modes directly / `FileSink::reopen()` 可显式重开当前文件句柄, `FileSink::reopen_with_current_policy()` 会按当前保存的策略重开文件, `FileSink::reopen_append()` / `FileSink::reopen_truncate()` 提供常见的 append 与 truncate 模式
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- `append_mode()` exposes the current append policy, and `reopen(append=...)` updates that policy for later reopen calls / `append_mode()` 可读取当前 append 策略, `reopen(append=...)` 会更新后续 reopen 复用的 append 策略
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- `set_append_mode(...)` updates the stored append policy without forcing an immediate reopen / `set_append_mode(...)` 可直接更新保存的 append 策略, 不会强制立即 reopen
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- `path()` and `auto_flush_enabled()` expose core file sink policy state / `path()` 与 `auto_flush_enabled()` 可读取 file sink 的基础策略状态
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- `rotation_enabled()` and `rotation_config()` expose whether rotation is active and which settings are currently applied / `rotation_enabled()` 与 `rotation_config()` 可读取 rotation 是否启用及当前配置参数
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- `state()` exposes a single file-sink snapshot including path, availability, append policy, auto-flush, rotation config, and failure counters / `state()` 可一次性读取包含 path, availability, append, auto_flush, rotation 配置与失败计数的 file sink 快照
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- `policy()` and `default_policy()` expose the current runtime policy and the sink's original defaults separately / `policy()` 与 `default_policy()` 可分别读取当前运行期策略与 sink 初始默认策略
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- `policy_matches_default()` explicitly tells whether the current runtime policy has drifted from the defaults / `policy_matches_default()` 可显式判断当前运行期策略是否已偏离默认策略
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- `set_policy(...)` applies append, auto-flush, and rotation as a bundled runtime update / `set_policy(...)` 可将 append, auto_flush, rotation 作为一组运行期策略一次性写回
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- `reset_failure_counters()` clears the open/write/flush/rotation counters after diagnostics or recovery / `reset_failure_counters()` 可在排障或恢复后清空 open/write/flush/rotation 失败计数
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- `reset_policy()` restores append, auto-flush, and rotation back to the sink's original defaults / `reset_policy()` 可将 append, auto_flush, rotation 恢复到 sink 初始默认策略
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- `file_sink_policy_to_json(...)` / `stringify_file_sink_policy(...)` also export standalone file policy snapshots as JSON / `file_sink_policy_to_json(...)` / `stringify_file_sink_policy(...)` 也可将独立 file policy 快照直接导出为 JSON
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- `file_sink_state_to_json(...)` / `stringify_file_sink_state(...)` and `runtime_file_state_to_json(...)` / `stringify_runtime_file_state(...)` export snapshots as JSON / `file_sink_state_to_json(...)` / `stringify_file_sink_state(...)` 与 `runtime_file_state_to_json(...)` / `stringify_runtime_file_state(...)` 可将快照直接导出为 JSON
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- `set_auto_flush(...)`, `set_rotation(...)`, and `clear_rotation()` allow runtime tuning of core file sink policies / `set_auto_flush(...)`, `set_rotation(...)`, `clear_rotation()` 可在运行期调整 file sink 的基础策略
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- `open_failures()`, `write_failures()`, `flush_failures()`, `rotation_failures()` expose basic sink health counters / `open_failures()`, `write_failures()`, `flush_failures()`, `rotation_failures()` 可用于观察基础 sink 健康状态
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- `ConfiguredLogger` also forwards file reopen, flush, close, append-mode, path, auto-flush, rotation-config, state snapshot, append setter, policy setter, and failure-counter helpers for config-built file sinks / `ConfiguredLogger` 也会为配置生成的 file sink 转发 reopen, flush, close, append-mode, path, auto-flush, rotation 配置, state 快照, append setter, 策略 setter 与失败计数访问器
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- `ConfiguredLogger::file_runtime_state()` also reports whether a file sink is queue-wrapped and exposes the outer queue pending/drop counters together with the inner file snapshot / `ConfiguredLogger::file_runtime_state()` 还可报告 file sink 是否被 queue 包装, 并将外层 queue 的 pending/drop 计数与内层 file 快照一起返回
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- `ConfiguredLogger::file_policy()` and `ConfiguredLogger::file_default_policy()` also expose current runtime policy and initial config policy separately / `ConfiguredLogger::file_policy()` 与 `ConfiguredLogger::file_default_policy()` 也可分别读取当前运行期策略与初始配置策略
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- `ConfiguredLogger::file_policy_matches_default()` also tells whether the current runtime file policy has drifted from the default config / `ConfiguredLogger::file_policy_matches_default()` 也可显式判断当前运行期 file 策略是否已偏离默认配置
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- `ConfiguredLogger::file_set_policy()` also applies a bundled runtime file policy through the config-built control surface / `ConfiguredLogger::file_set_policy()` 也可通过配置式控制面一次性写回 bundled file 策略
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- `ConfiguredLogger::file_reset_failure_counters()` also clears file failure counters through the config-built control surface / `ConfiguredLogger::file_reset_failure_counters()` 也可通过配置式控制面清空 file 失败计数
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- `ConfiguredLogger::file_reset_policy()` also restores runtime file policy back to the initial config values / `ConfiguredLogger::file_reset_policy()` 也可将运行期 file 策略恢复到初始配置值
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- current scope is observability-first, not a full self-healing sink runtime / 当前以可观测性为主, 不提供完整的自恢复 sink runtime.
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