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use std::{
path::PathBuf,
time::{Duration, SystemTime},
};
use anyhow::{Result, anyhow};
#[derive(serde::Serialize, serde::Deserialize, Debug, Clone)]
struct SerialCacheEntry {
serial: String,
expires_at_unix: u64,
}
fn cache_file_path() -> Result<PathBuf> {
let proj_dir = dirs::cache_dir()
.ok_or_else(|| anyhow!("No cache dir"))?
.join("camper-widget-refresh");
Ok(proj_dir.join("serial.json"))
}
pub async fn read_serial_cache() -> Result<Option<String>> {
let path = cache_file_path()?;
if !path.exists() {
return Ok(None);
}
let content = tokio::fs::read_to_string(&path)
.await
.map_err(|e| anyhow!("Failed to read cache file at {}: {}", path.display(), e))?;
let entry: SerialCacheEntry = serde_json::from_str(&content)?;
let now = SystemTime::now()
.duration_since(SystemTime::UNIX_EPOCH)?
.as_secs();
if now <= entry.expires_at_unix {
Ok(Some(entry.serial))
} else {
Ok(None)
}
}
pub async fn write_serial_cache(serial: &str, ttl: Duration) -> Result<()> {
let path = cache_file_path()?;
if let Some(parent) = path.parent() {
tokio::fs::create_dir_all(parent).await.map_err(|e| {
anyhow!(
"Failed to create cache directory {}: {}",
parent.display(),
e
)
})?;
}
let now = SystemTime::now()
.duration_since(SystemTime::UNIX_EPOCH)?
.as_secs();
let entry = SerialCacheEntry {
serial: serial.to_string(),
expires_at_unix: now + ttl.as_secs(),
};
let data = serde_json::to_string(&entry)?;
tokio::fs::write(&path, data)
.await
.map_err(|e| anyhow!("Failed to write cache file at {}: {}", path.display(), e))?;
Ok(())
}
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