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move cache file I/O off the async runtime thread

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rates.json, market.json and rates-<date>.json reads/writes ran
straight on the tokio worker calling the Tauri command, blocking the
shared async runtime for the duration. Wrap them in
tauri::async_runtime::spawn_blocking via read_file_async/write_atomic_async.
This commit is contained in:
Horizontal42 2026-08-12 19:57:55 +03:00
parent 2d682448c6
commit dea7314842
1 changed files with 22 additions and 10 deletions
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32
src-tauri/src/main.rs
View file

@ -195,8 +195,19 @@ fn now_secs() -> u64 {
.as_secs()
}
fn read_rates_cache(app: &AppHandle) -> Option<RatesCache> {
let raw = fs::read_to_string(data_dir(app).join("rates.json")).ok()?;
async fn read_file_async(path: PathBuf) -> Option<String> {
tauri::async_runtime::spawn_blocking(move || fs::read_to_string(path).ok())
.await
.ok()
.flatten()
}
async fn write_atomic_async(path: PathBuf, contents: String) {
let _ = tauri::async_runtime::spawn_blocking(move || write_atomic(&path, &contents)).await;
}
async fn read_rates_cache(app: &AppHandle) -> Option<RatesCache> {
let raw = read_file_async(data_dir(app).join("rates.json")).await?;
serde_json::from_str(&raw).ok()
}
@ -253,7 +264,7 @@ async fn fetch_rates_online() -> Result<RatesPayload, String> {
#[tauri::command]
async fn fetch_rates(app: AppHandle, force: bool) -> Result<RatesPayload, String> {
if !force {
if let Some(cache) = read_rates_cache(&app) {
if let Some(cache) = read_rates_cache(&app).await {
if now_secs().saturating_sub(cache.fetched_at) < RATES_TTL_SECS {
let mut payload = cache.payload;
payload.fetched_at = cache.fetched_at;
@ -268,11 +279,12 @@ async fn fetch_rates(app: AppHandle, force: bool) -> Result<RatesPayload, String
payload: payload.clone(),
};
if let Ok(raw) = serde_json::to_string(&cache) {
write_atomic(&data_dir(&app).join("rates.json"), &raw).ok();
write_atomic_async(data_dir(&app).join("rates.json"), raw).await;
}
Ok(payload)
}
Err(e) => read_rates_cache(&app)
.await
.map(|c| {
let mut payload = c.payload;
payload.fetched_at = c.fetched_at;
@ -300,7 +312,7 @@ async fn fetch_market_data(
let cache_path = data_dir(&app).join("market.json");
// try cache first
if let Ok(raw) = fs::read_to_string(&cache_path) {
if let Some(raw) = read_file_async(cache_path.clone()).await {
if let Ok(cache) = serde_json::from_str::<MarketCache>(&raw) {
if now_secs().saturating_sub(cache.fetched_at) < MARKET_TTL_SECS {
let syms: std::collections::HashSet<&str> =
@ -364,7 +376,7 @@ async fn fetch_market_data(
prices: prices.clone(),
};
if let Ok(raw) = serde_json::to_string(&cache) {
write_atomic(&cache_path, &raw).ok();
write_atomic_async(cache_path, raw).await;
}
}
@ -410,7 +422,7 @@ async fn fetch_historical_rates(
return Err("invalid date format".into());
}
let cache_path = data_dir(&app).join(format!("rates-{}.json", date));
if let Ok(raw) = fs::read_to_string(&cache_path) {
if let Some(raw) = read_file_async(cache_path.clone()).await {
if let Ok(cached) = serde_json::from_str::<std::collections::HashMap<String, f64>>(&raw) {
return Ok(cached);
}
@ -434,7 +446,7 @@ async fn fetch_historical_rates(
.map_err(|e| e.to_string())?;
let rates = parse_rate_map(body["rates"].as_object().ok_or("no rates in response")?);
if let Ok(serialized) = serde_json::to_string(&rates) {
write_atomic(&cache_path, &serialized).ok();
write_atomic_async(cache_path, serialized).await;
}
Ok(rates)
}
@ -452,7 +464,7 @@ async fn fetch_historical_rates_batch(
continue;
}
let cache_path = data_dir(&app).join(format!("rates-{}.json", date));
if let Ok(raw) = std::fs::read_to_string(&cache_path) {
if let Some(raw) = read_file_async(cache_path).await {
if let Ok(cached) = serde_json::from_str::<std::collections::HashMap<String, f64>>(&raw)
{
results.insert(date.clone(), cached);
@ -488,7 +500,7 @@ async fn fetch_historical_rates_batch(
let daily_rates = parse_rate_map(rates_obj);
let cache_path = data_dir(&app_clone).join(format!("rates-{}.json", date));
if let Ok(serialized) = serde_json::to_string(&daily_rates) {
let _ = crate::write_atomic(&cache_path, &serialized);
write_atomic_async(cache_path, serialized).await;
}
rate_map = Some((date, daily_rates));
}