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Nanaloveyuki
89 lines
3.4 KiB
Markdown
89 lines
3.4 KiB
Markdown
---
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name: build-async-logger
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group: api
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category: async
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update-time: 20260512
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description: Build an async logger from combined logger and async config without manually wiring the runtime sink.
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key-word:
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- async
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- config
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- builder
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- public
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---
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## Build-async-logger
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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.
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### Interface
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```moonbit
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pub fn build_async_logger(config : AsyncLoggerBuildConfig) -> AsyncLogger[@bitlogger.RuntimeSink] {}
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```
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#### input
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- `config : AsyncLoggerBuildConfig` - Combined synchronous logger config plus async queue/flush config.
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#### output
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- `AsyncLogger[RuntimeSink]` - A config-built async logger with runtime sink control preserved.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- The `logger` section is built through the same config machinery used by synchronous configured loggers.
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- The resulting async logger inherits `min_level`, `target`, and timestamp behavior from the built synchronous logger.
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- File, queue, and formatter choices all come from config rather than direct code-side sink wiring.
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- The returned sink type is `RuntimeSink`, which keeps configured control helpers available where relevant.
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- The `src-async` library is designed to compile on `native / llvm / js / wasm / wasm-gc`, but runtime mode differs by backend.
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- Current local release-facing verification is explicit for `native / js / wasm / wasm-gc`.
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- `llvm` remains experimental and did not complete local verification in this environment.
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- 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.
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### How to Use
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Here are some specific examples provided.
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#### When Need Fully Config-driven Async Bootstrapping
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When your application should build async logging entirely from configuration:
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```moonbit
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let config = parse_async_logger_build_config_text(raw) catch {
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err => return
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}
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let logger = build_async_logger(config)
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```
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In this example, parsing and async runtime wiring are separated cleanly.
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And the returned logger can immediately be started with `run()`.
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#### When Need Runtime Sink Features After Async Build
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When the sink shape is configured but runtime features still matter:
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```moonbit
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let logger = build_async_logger(config)
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println(stringify_async_logger_state(logger.state(), pretty=true))
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```
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In this example, the built async logger remains introspectable even though construction was config-driven.
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### Error Case
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e.g.:
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- If the config text was invalid, error handling should happen earlier in `parse_async_logger_build_config_text(...)`.
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- 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.
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### Notes
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1. Prefer this API when applications externalize both sync sink choice and async queue behavior.
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2. Use `async_logger(...)` directly when you want explicit code-defined sink wiring.
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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.
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4. See [target-verification.md](./target-verification.md) for the current verification boundary.
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