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Nanaloveyuki
89 lines
2.5 KiB
Markdown
89 lines
2.5 KiB
Markdown
---
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name: parse-and-build-logger
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group: api
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category: config
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update-time: 20260512
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description: Parse logger JSON config and immediately build a runtime logger with a stable control surface.
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key-word:
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- config
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- logger
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- json
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- public
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---
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## Parse-and-build-logger
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Parse a JSON logger definition and build a ready-to-use `ConfiguredLogger`. This is the most direct API when configuration is loaded from files, environment-derived JSON, or external settings systems.
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### Interface
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```moonbit
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pub fn parse_and_build_logger(input : String) -> ConfiguredLogger raise ConfigError {}
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```
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#### input
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- `input : String` - JSON text following the supported `LoggerConfig` schema.
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#### output
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- `ConfiguredLogger` - A runtime logger with normal logging methods plus queue/file control helpers.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- Parsing and building are done in one step, which is useful when you do not need to inspect the intermediate `LoggerConfig`.
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- The returned `ConfiguredLogger` is just `Logger[RuntimeSink]`, so it still supports regular logging calls.
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- Queue wrapping and file control helpers remain available after config assembly.
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- Errors are surfaced as `ConfigError` rather than silent fallback.
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### How to Use
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Here are some specific examples provided.
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#### When Load Logger From JSON Text
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When configuration comes from a file, environment variable, or settings service:
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```moonbit
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let logger = parse_and_build_logger(
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"{\"min_level\":\"info\",\"target\":\"api\",\"sink\":{\"kind\":\"text_console\"}}",
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) catch {
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err => {
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ignore(err)
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return
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}
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}
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```
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In this example, config parsing and logger construction happen in one place.
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And the resulting value can immediately emit logs.
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#### When Need Config-built File Or Queue Controls
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When the sink shape is chosen by config but runtime introspection is still required:
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```moonbit
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let logger = parse_and_build_logger(raw) catch {
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err => return
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}
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ignore(logger.pending_count())
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ignore(logger.file_runtime_state())
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```
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In this example, the configured runtime surface is still operational after building.
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### Error Case
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e.g.:
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- If `input` is not valid JSON, a `ConfigError` is raised.
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- If supported keys have wrong types or unsupported enum text, a `ConfigError` is raised.
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### Notes
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1. Use `parse_logger_config_text(...)` first if you want to validate and inspect config separately.
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2. Prefer this API for app bootstrapping paths that read config once and then construct the runtime logger.
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