30 lines
863 B
Rust
30 lines
863 B
Rust
|
// Status file management
|
||
|
|
//
|
||
|
|
// Writes a JSON status snapshot to data_dir/daemon-status.json.
|
||
|
|
// Applications provide their own status struct (must impl Serialize).
|
||
|
|
|
||
|
|
use std::fs;
|
||
|
|
use std::path::Path;
|
||
|
|
|
||
|
|
fn status_path(data_dir: &Path) -> std::path::PathBuf {
|
||
|
|
data_dir.join("daemon-status.json")
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Write a status snapshot to the status file.
|
||
|
|
pub fn write<S: serde::Serialize>(data_dir: &Path, status: &S) {
|
||
|
|
if let Ok(json) = serde_json::to_string_pretty(status) {
|
||
|
|
let _ = fs::write(status_path(data_dir), json);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Read the status file as a string.
|
||
|
|
pub fn read(data_dir: &Path) -> Option<String> {
|
||
|
|
fs::read_to_string(status_path(data_dir)).ok()
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Read and deserialize the status file.
|
||
|
|
pub fn load<S: serde::de::DeserializeOwned>(data_dir: &Path) -> Option<S> {
|
||
|
|
let s = read(data_dir)?;
|
||
|
|
serde_json::from_str(&s).ok()
|
||
|
|
}
|