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Nanaloveyuki
83 lines
2.3 KiB
Markdown
83 lines
2.3 KiB
Markdown
---
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name: async-logger-with-patch
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group: api
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category: async
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update-time: 20260512
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description: Attach record transformation logic to an async logger before records reach the queue.
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key-word:
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- async
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- logger
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- patch
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- public
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---
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## Async-logger-with-patch
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Attach a record patch to an async logger so each record is transformed before filtering and enqueue. This is the main API for async record rewriting without changing the sink implementation.
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### Interface
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```moonbit
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pub fn[S] AsyncLogger::with_patch(
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self : AsyncLogger[S],
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patch : @bitlogger.RecordPatch,
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) -> AsyncLogger[S] {}
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```
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#### input
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- `self : AsyncLogger[S]` - Base async logger to wrap.
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- `patch : RecordPatch` - Transformation applied to each record before enqueue.
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#### output
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- `AsyncLogger[S]` - A new async logger that rewrites each record before filtering and queue insertion.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- Patch logic runs after record creation and field merging but before filtering and enqueue.
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- Existing patch logic is preserved and composed so the new patch wraps the current one.
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- The original async logger is not mutated.
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- Patching can normalize, redact, or enrich records before they consume queue capacity.
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### How to Use
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Here are some specific examples provided.
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#### When Need Async Record Enrichment
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When records should gain stable extra data before enqueue:
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```moonbit
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let logger = async_logger(console_sink())
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.with_patch(@bitlogger.append_fields([
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@bitlogger.field("channel", "async"),
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]))
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```
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In this example, the added fields are part of the record before filtering and queue insertion.
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#### When Need Redaction Before Queueing
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When sensitive fields should be removed early:
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```moonbit
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let logger = async_logger(console_sink())
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.with_patch(@bitlogger.redact_fields(["token", "password"]))
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```
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In this example, sensitive values are rewritten before they enter the async pipeline.
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### Error Case
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e.g.:
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- If the patch removes or rewrites important data incorrectly, later filters and sinks will only see the patched version.
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- If callers need selection logic rather than transformation, `with_filter(...)` should be used instead.
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### Notes
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1. Use patches for transformation, not filtering decisions.
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2. Redaction before enqueue helps keep sensitive data out of the queued pipeline.
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