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util: add jsonl_load/jsonl_append helpers, convert graph.rs

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Shared JSONL read/write in util.rs replaces hand-rolled patterns.
graph.rs metrics load/save converted as first consumer.

Co-Authored-By: ProofOfConcept <poc@bcachefs.org>
This commit is contained in:
Kent Overstreet 2026-03-10 15:22:03 -04:00
parent 0e1e5a1981
commit c6bb7c3910
2 changed files with 31 additions and 18 deletions
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19
poc-memory/src/graph.rs
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@ -524,27 +524,12 @@ fn metrics_log_path() -> std::path::PathBuf {
/// Load previous metrics snapshots
pub fn load_metrics_history() -> Vec<MetricsSnapshot> {
let path = metrics_log_path();
let content = match std::fs::read_to_string(&path) {
Ok(c) => c,
Err(_) => return Vec::new(),
};
content.lines()
.filter_map(|line| serde_json::from_str(line).ok())
.collect()
crate::util::jsonl_load(&metrics_log_path())
}
/// Append a metrics snapshot to the log
pub fn save_metrics_snapshot(snap: &MetricsSnapshot) {
let path = metrics_log_path();
if let Ok(json) = serde_json::to_string(snap) {
use std::io::Write;
if let Ok(mut f) = std::fs::OpenOptions::new()
.create(true).append(true).open(&path)
{
let _ = writeln!(f, "{}", json);
}
}
let _ = crate::util::jsonl_append(&metrics_log_path(), snap);
}
/// Compute current graph metrics as a snapshot (no side effects).