refactor: better logs

src-tauri/src/process_report.rs

@@ -0,0 +1,63 @@
+//! What Donut has running outside its own process, as `key=[id@pid ...]`
+//! fields for one log line. Logged at startup (what an earlier run left) and at
+//! exit (what outlives this run), so a report that Donut "keeps running" can be
+//! answered from the log alone.
+
+use crate::proxy_storage::is_process_running;
+
+pub fn summary() -> String {
+  let browsers = crate::profile::ProfileManager::instance()
+    .list_profiles()
+    .unwrap_or_default()
+    .into_iter()
+    .filter_map(|profile| {
+      let pid = profile.process_id.filter(|pid| is_process_running(*pid))?;
+      Some((profile.id.to_string(), pid))
+    });
+  let proxies = crate::proxy_storage::list_proxy_configs()
+    .into_iter()
+    .filter_map(|config| Some((config.id, config.pid?)));
+  let vpns = crate::vpn_worker_storage::list_vpn_worker_configs()
+    .into_iter()
+    .filter_map(|config| Some((config.id, config.pid?)));
+  let xrays = crate::xray_worker_storage::list_xray_worker_configs()
+    .into_iter()
+    .filter_map(|config| Some((config.id, config.pid?)));
+
+  let mut line = format!(
+    "browsers={} proxy_workers={} vpn_workers={} xray_workers={}",
+    alive(browsers),
+    alive(proxies),
+    alive(vpns),
+    alive(xrays)
+  );
+  if let Some(mounted) = crate::ephemeral_dirs::ram_disk_mounted() {
+    line.push_str(if mounted {
+      " ram_disk=mounted"
+    } else {
+      " ram_disk=absent"
+    });
+  }
+  line
+}
+
+fn alive(entries: impl Iterator<Item = (String, u32)>) -> String {
+  let listed: Vec<String> = entries
+    .filter(|(_, pid)| is_process_running(*pid))
+    .map(|(id, pid)| format!("{id}@{pid}"))
+    .collect();
+  format!("[{}]", listed.join(" "))
+}
+
+#[cfg(test)]
+mod tests {
+  use super::alive;
+
+  #[test]
+  fn only_live_processes_are_listed() {
+    let own = std::process::id();
+    let listed = alive([("live".to_string(), own), ("gone".to_string(), u32::MAX)].into_iter());
+    assert_eq!(listed, format!("[live@{own}]"));
+    assert_eq!(alive(std::iter::empty()), "[]");
+  }
+}