Refactor using Tauri (#278)

apps/gpclient/src/disconnect.rs

@@ -0,0 +1,31 @@
+use crate::GP_CLIENT_LOCK_FILE;
+use log::{info, warn};
+use std::fs;
+use sysinfo::{Pid, ProcessExt, Signal, System, SystemExt};
+
+pub(crate) struct DisconnectHandler;
+
+impl DisconnectHandler {
+  pub(crate) fn new() -> Self {
+    Self
+  }
+
+  pub(crate) fn handle(&self) -> anyhow::Result<()> {
+    if fs::metadata(GP_CLIENT_LOCK_FILE).is_err() {
+      warn!("PID file not found, maybe the client is not running");
+      return Ok(());
+    }
+
+    let pid = fs::read_to_string(GP_CLIENT_LOCK_FILE)?;
+    let pid = pid.trim().parse::<usize>()?;
+    let s = System::new_all();
+
+    if let Some(process) = s.process(Pid::from(pid)) {
+      info!("Found process {}, killing...", pid);
+      if process.kill_with(Signal::Interrupt).is_none() {
+        warn!("Failed to kill process {}", pid);
+      }
+    }
+    Ok(())
+  }
+}