mirror of
https://github.com/Nanaloveyuki/BitLogger.git
synced 2026-07-24 08:52:35 +00:00
Nanaloveyuki
97 lines
4.6 KiB
Markdown
97 lines
4.6 KiB
Markdown
---
|
|
name: build-async-logger
|
|
group: api
|
|
category: async
|
|
update-time: 20260614
|
|
description: Build an async logger from combined logger and async config by first building the sync runtime logger and then wrapping its sink in the async layer.
|
|
key-word:
|
|
- async
|
|
- config
|
|
- builder
|
|
- public
|
|
---
|
|
|
|
## Build-async-logger
|
|
|
|
Build an async logger directly from `AsyncLoggerBuildConfig`. This is the config-driven async entry point that bridges synchronous logger config, sink creation, and async queue setup in one call.
|
|
|
|
### Interface
|
|
|
|
```moonbit
|
|
pub fn build_async_logger(config : AsyncLoggerBuildConfig) -> AsyncLogger[@bitlogger.RuntimeSink] {}
|
|
```
|
|
|
|
#### input
|
|
|
|
- `config : AsyncLoggerBuildConfig` - Combined synchronous logger config plus async queue/flush config.
|
|
|
|
#### output
|
|
|
|
- `AsyncLogger[RuntimeSink]` - A config-built async logger with runtime sink control preserved.
|
|
|
|
### Explanation
|
|
|
|
Detailed rules explaining key parameters and behaviors
|
|
|
|
- The `logger` section is built through the same config machinery used by synchronous configured loggers.
|
|
- That means `LoggerConfig.sink` and the optional synchronous `LoggerConfig.queue` are applied before the async layer is added.
|
|
- The resulting async logger inherits `min_level`, `target`, and timestamp behavior from the built synchronous logger.
|
|
- File, formatter, and any configured synchronous queue choices all come from config rather than direct code-side sink wiring.
|
|
- The returned sink type is `RuntimeSink`, which keeps configured control helpers available where relevant.
|
|
- This builder returns the underlying `AsyncLogger[@bitlogger.RuntimeSink]` value directly. `build_application_async_logger(...)` only re-exports the same result under the `ApplicationAsyncLogger` alias, while `build_library_async_logger(...)` wraps the same result in `LibraryAsyncLogger[@bitlogger.RuntimeSink]`.
|
|
- Because this path starts from `build_logger(config.logger)`, it preserves the broader runtime-sink build path, including sync-side queue decoration when `LoggerConfig.queue` is present.
|
|
- Use `build_async_text_logger(...)` instead when you want the direct text-console async builder path with `FormattedConsoleSink` and without the sync runtime-sink construction layer.
|
|
- The `src-async` library is designed to compile on `native / llvm / js / wasm / wasm-gc`, but runtime mode differs by backend.
|
|
- Current local release-facing verification is explicit for `native / js / wasm / wasm-gc`.
|
|
- `llvm` remains experimental and did not complete local verification in this environment.
|
|
- On non-native targets, the async library still compiles and exposes the same public surface through compatibility-mode behavior rather than native background-worker semantics.
|
|
|
|
### How to Use
|
|
|
|
Here are some specific examples provided.
|
|
|
|
#### When Need Fully Config-driven Async Bootstrapping
|
|
|
|
When your application should build async logging entirely from configuration:
|
|
```moonbit
|
|
let config = parse_async_logger_build_config_text(raw) catch {
|
|
err => return
|
|
}
|
|
let logger = build_async_logger(config)
|
|
```
|
|
|
|
In this example, parsing and async runtime wiring are separated cleanly.
|
|
|
|
And the returned logger can immediately be started with `run()`.
|
|
|
|
#### When Need Runtime Sink Features After Async Build
|
|
|
|
When the sink shape is configured but runtime features still matter:
|
|
```moonbit
|
|
let logger = build_async_logger(config)
|
|
println(stringify_async_logger_state(logger.state(), pretty=true))
|
|
```
|
|
|
|
In this example, the built async logger remains introspectable even though construction was config-driven.
|
|
|
|
And any configured synchronous runtime sink controls are preserved inside the returned `RuntimeSink`.
|
|
|
|
### Error Case
|
|
|
|
e.g.:
|
|
- If the config text was invalid, error handling should happen earlier in `parse_async_logger_build_config_text(...)`.
|
|
|
|
- If the configured sink shape is unsupported for a specific capability, the resulting runtime behavior follows the existing sink/runtime rules rather than inventing a separate builder-only failure model.
|
|
|
|
### Notes
|
|
|
|
1. Prefer this API when applications externalize both sync sink choice and async queue behavior.
|
|
|
|
2. Use `async_logger(...)` directly when you want explicit code-defined sink wiring.
|
|
|
|
3. Library portability is broader than example portability: a runnable `async fn main` example may still be target-limited even when the async library itself compiles for that backend.
|
|
|
|
4. See [target-verification.md](./target-verification.md) for the current verification boundary.
|
|
|
|
5. If the next boundary is library-facing rather than application-facing, build here and then narrow with `build_library_async_logger(...)` instead of documenting the broader runtime helper surface directly.
|