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Persist state through the shared atomic writer #6

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Merged
kridaydave merged 1 commit into from
Oct 6, 2026
Merged

Persist state through the shared atomic writer #6

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22 changes: 2 additions & 20 deletions src/engine.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -112,28 +112,10 @@ impl StateEngine {
}
}

/// Save signed state to file (pretty JSON) — atomic via tempfile in same dir
/// Save signed state to file (pretty JSON), atomically.
pub fn save(path: &std::path::Path, signed: &SignedState) -> Result<(), TaprootError> {
use std::io::Write;
let bytes = serde_json::to_vec_pretty(signed)?;
let parent = path
.parent()
.filter(|p| !p.as_os_str().is_empty())
.unwrap_or_else(|| std::path::Path::new("."));
if !parent.as_os_str().is_empty() && parent != std::path::Path::new(".") {
std::fs::create_dir_all(parent)?;
}
// Use tempfile with random suffix to avoid symlink races and collisions
let mut tmp = tempfile::NamedTempFile::new_in(parent)?;
tmp.write_all(&bytes)?;
tmp.flush()?;
tmp.as_file().sync_all()?;
tmp.persist(path).map_err(|e| TaprootError::Io(e.error))?;
// fsync parent dir for durability
if let Ok(dir) = std::fs::File::open(parent) {
let _ = dir.sync_all();
}
Ok(())
crate::util::atomic_write(path, &bytes)
}

/// Load signed state from file and verify
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