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Nanaloveyuki
79 lines
2.4 KiB
Markdown
79 lines
2.4 KiB
Markdown
---
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name: config-error
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group: api
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category: config
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update-time: 20260707
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description: Public config parsing error re-exported from config_model for synchronous config-loading helpers.
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key-word:
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- config
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- error
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- alias
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- public
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---
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## Config-error
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`ConfigError` is the public error type raised by synchronous config parsing helpers. On the root `src` facade, it is re-exported from `src/config_model`, which is the real owner of the structured config error definition.
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### Interface
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```moonbit
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pub using @config_model { type ConfigError }
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```
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#### output
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- `ConfigError` - Public config parsing error type with the case `InvalidConfig(String)`.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- This root surface is a re-export, not the concrete owner definition.
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- The concrete error lives in `@config_model.ConfigError`, not in `@utils`.
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- The current public error case is `ConfigError::InvalidConfig(message)`.
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- The alias is used by parsing helpers such as `parse_logger_config_text(...)` and by lower-level config parsing routines beneath it.
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- Error messages describe concrete schema problems such as invalid JSON, wrong value types, unsupported enum text, or missing required values for a chosen sink kind.
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### How to Use
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Here are some specific examples provided.
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#### When Need To Catch Config Parse Failures
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When raw config text should be validated before boot:
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```moonbit
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let config = parse_logger_config_text(raw) catch {
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err if err is ConfigError => {
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println(err.to_string())
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return
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}
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}
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```
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In this example, the caller keeps config validation failures separate from normal runtime work.
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#### When Need To Surface A Clear Parse Message
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When tooling should report why config input was rejected:
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```moonbit
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ignore(parse_logger_config_text("{bad json}")) catch {
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err => println(err.to_string())
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}
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```
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In this example, the error carries a concrete message instead of failing silently.
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### Error Case
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e.g.:
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- Invalid JSON input raises `ConfigError::InvalidConfig(...)`.
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- Wrong field types, unsupported level text, unsupported sink kinds, or an empty `path` for a file sink also raise `ConfigError::InvalidConfig(...)`.
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### Notes
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1. This alias currently belongs to the synchronous config-loading path in `bitlogger`.
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2. Async config parsers in `bitlogger_async` currently raise the generic failure surface used by that package instead of `ConfigError`.
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