Skip to content

Async-logger-debug ​

Enqueue a debug-level record through the async logger. This is the convenience wrapper for log(Level::Debug, ...).

Interface ​

moonbit
pub async fn[S] AsyncLogger::debug(
  self : AsyncLogger[S],
  message : String,
  fields~ : Array[@bitlogger.Field] = [],
) -> Unit {}

input ​

  • self : AsyncLogger[S] - Async logger that should receive the debug record.
  • message : String - Debug message text.
  • fields : Array[Field] - Optional structured fields added to the record.

output ​

  • Unit - No return value. The record is handled according to logger state and policy.

Explanation ​

Detailed rules explaining key parameters and behaviors

  • This helper delegates to log(Level::Debug, ..., fields=fields).
  • The record is still subject to min-level gating, patching, filtering, and overflow policy.
  • This helper does not accept a per-call target override. It uses the logger's stored target unless the logger was derived earlier with with_target(...) or child(...).
  • Debug records are useful for development and targeted diagnostics.
  • Use this helper when a named debug call is clearer than a raw log(...) call.

How to Use ​

Here are some specific examples provided.

When Need Async Development Diagnostics ​

When intermediate async flow details should be visible during debugging:

moonbit
logger.debug("loaded worker config")

In this example, the call site communicates its intended diagnostic level directly.

When Attach Structured Debug Context ​

When a debug event should include extra fields:

moonbit
logger.debug(
  "dispatch start",
  fields=[@bitlogger.field("job_id", "42")],
)

In this example, the record carries structured context without needing the generic log(...) form.

Error Case ​

e.g.:

  • If the logger minimum level is above Debug, the record is skipped before enqueue.

  • If the logger is closed or overflow policy prevents acceptance, the write may not become a normal queued record.

Notes ​

  1. Prefer this helper when the event is semantically debug-level.

  2. Use log(...) when the level must be chosen dynamically or one call needs a target override.

Published from the repository docs folder with VitePress.