75 lines
2.5 KiB
Rust
75 lines
2.5 KiB
Rust
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//! JSON file–backed `SettingsRepository`.
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//!
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//! Path: `<base_dir>/settings.json`
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//!
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//! Uses write-then-rename with fsync for crash safety.
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#![allow(
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clippy::cast_possible_truncation,
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clippy::cast_sign_loss,
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clippy::cast_precision_loss,
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clippy::cast_possible_wrap
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)]
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use std::io::Write;
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use std::path::Path;
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use anyhow::{Context, Result};
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use crate::domain::repository::SettingsRepository;
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use crate::domain::settings::Settings;
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/// Persists `Settings` as pretty-printed JSON at `<base_dir>/settings.json`.
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#[derive(Debug, Clone, Default)]
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pub struct JsonSettingsRepository;
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impl JsonSettingsRepository {
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/// Create a new repository instance.
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pub fn new() -> Self {
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Self
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}
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}
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impl SettingsRepository for JsonSettingsRepository {
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fn load(&self, base_dir: &Path) -> Result<Settings> {
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let path = base_dir.join("settings.json");
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match std::fs::read_to_string(&path) {
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Ok(s) => serde_json::from_str(&s)
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.map_err(|e| anyhow::anyhow!("failed to parse settings.json: {e}")),
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Err(e) if e.kind() == std::io::ErrorKind::NotFound => {
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tracing::info!("settings.json not found, using defaults");
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Ok(Settings::default())
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}
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Err(e) => Err(anyhow::anyhow!("failed to read settings.json: {e}")),
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}
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}
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fn save(&self, base_dir: &Path, settings: &Settings) -> Result<()> {
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std::fs::create_dir_all(base_dir)
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.with_context(|| format!("failed to create base dir '{}'", base_dir.display()))?;
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let path = base_dir.join("settings.json");
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let tmp = base_dir.join("settings.json.tmp");
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let json = serde_json::to_string_pretty(settings)
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.context("failed to serialize settings")?;
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{
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let mut f = std::fs::OpenOptions::new()
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.create(true)
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.truncate(true)
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.write(true)
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.open(&tmp)
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.with_context(|| format!("failed to write temp file '{}'", tmp.display()))?;
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f.write_all(json.as_bytes())?;
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f.sync_all()?;
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}
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std::fs::rename(&tmp, &path)
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.with_context(|| format!("failed to rename '{}' -> '{}'", tmp.display(), path.display()))?;
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if let Some(parent) = path.parent() {
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if let Ok(d) = std::fs::File::open(parent) {
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let _ = d.sync_all();
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}
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}
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tracing::debug!("settings saved to '{}'", path.display());
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Ok(())
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}
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}
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