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Nanaloveyuki
36 lines
1.3 KiB
Markdown
36 lines
1.3 KiB
Markdown
# Configuration-Driven Logging
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Use configuration when deployment should select levels, output, formatting, or queue behavior without changing application code.
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## Parse, Build, Then Log
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```moonbit
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let raw = "{\"min_level\":\"info\",\"target\":\"service\",\"sink\":{\"kind\":\"text_console\",\"text_formatter\":{\"show_timestamp\":false,\"separator\":\" | \"}},\"queue\":{\"max_pending\":64,\"overflow\":\"DropOldest\"}}"
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let config = @log.parse_logger_config_text(raw) catch {
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err => {
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ignore(err)
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println("invalid logger configuration")
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return
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}
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}
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let logger = @log.build_logger(config)
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logger.info("configured logger ready")
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ignore(logger.flush())
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```
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Parsing validates the data before runtime construction. Keep the raw configuration outside application code in a real deployment, but handle parsing errors at the boundary where configuration enters the process.
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## Run The Repository Example
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```bash
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moon run examples/config_build
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```
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## Next Steps
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- Use [Queueing](../extend/queue.md) to choose overflow behavior deliberately.
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- Use [Async lifecycle](./async.md) when the queue needs a background worker.
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- Reference: [`parse_logger_config_text(...)`](../api/parse-logger-config-text.md), [`build_logger(...)`](../api/build-logger.md), and [`with_queue(...)`](../api/with-queue.md).
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