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BitLogger/docs/api/runtime-file-state-to-json.md
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2026-05-12 15:05:58 +08:00

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---
name: runtime-file-state-to-json
group: api
category: runtime
update-time: 20260512
description: Convert RuntimeFileState into a JSON value that combines file status with outer queue runtime metrics.
key-word:
- runtime
- file
- state
- public
---
## Runtime-file-state-to-json
Convert `RuntimeFileState` into a `JsonValue`. This helper exports both file sink status and outer queue metrics for queued file runtime diagnostics.
### Interface
```moonbit
pub fn runtime_file_state_to_json(state : RuntimeFileState) -> @json_parser.JsonValue {}
```
#### input
- `state : RuntimeFileState` - Combined file and queue runtime snapshot.
#### output
- `JsonValue` - Structured JSON representation of the runtime file state.
### Explanation
Detailed rules explaining key parameters and behaviors
- The output includes `file`, `queued`, `pending_count`, and `dropped_count`.
- `file` is itself exported as a nested file sink state object.
- This helper is richer than `file_sink_state_to_json(...)` because it also carries queue wrapping context.
- It is useful for `ConfiguredLogger::file_runtime_state()` and similar queued-file diagnostics flows.
### How to Use
Here are some specific examples provided.
#### When Need Structured Queued-file Diagnostics
When file and queue status should be exported together:
```moonbit
let value = runtime_file_state_to_json(snapshot)
```
In this example, callers receive a machine-readable combined runtime snapshot.
#### When Need Support Payload Composition
When queued file runtime data should be embedded into a larger JSON object:
```moonbit
let payload = runtime_file_state_to_json(state)
```
In this example, the helper keeps file-plus-queue diagnostics in one reusable JSON value.
### Error Case
e.g.:
- If `queued=false`, the state still serializes normally with queue counters present.
- If callers need direct text output, `stringify_runtime_file_state(...)` is the better API.
### Notes
1. Use this helper when file and queue runtime context should stay together.
2. It is especially useful for configured queued file loggers.