proxmox-rest-server: improve docs

And renames abort_worker_async to abort_worker_nowait (avoid confusion,
because the function itself is not async).

proxmox-rest-server/src/command_socket.rs

@@ -102,7 +102,7 @@ where
     Ok(task)
 }
 
-
+/// Send a command to the specified socket
 pub async fn send_command<P, T>(path: P, params: &T) -> Result<Value, Error>
 where
     P: AsRef<Path>,
@@ -113,6 +113,7 @@ where
     send_raw_command(path.as_ref(), &command_string).await
 }
 
+/// Send a raw command (string) to the specified socket
 pub async fn send_raw_command<P>(path: P, command_string: &str) -> Result<Value, Error>
 where
     P: AsRef<Path>,
@@ -146,11 +147,12 @@ where
     }
 }
 
-/// A callback for a specific commando socket.
-pub type CommandoSocketFn = Box<(dyn Fn(Option<&Value>) -> Result<Value, Error> + Send + Sync + 'static)>;
+// A callback for a specific commando socket.
+type CommandoSocketFn = Box<(dyn Fn(Option<&Value>) -> Result<Value, Error> + Send + Sync + 'static)>;
 
-/// Tooling to get a single control command socket where one can register multiple commands
-/// dynamically.
+/// Tooling to get a single control command socket where one can
+/// register multiple commands dynamically.
+///
 /// You need to call `spawn()` to make the socket active.
 pub struct CommandoSocket {
     socket: PathBuf,

proxmox-rest-server/src/lib.rs

@@ -40,6 +40,7 @@ pub use worker_task::*;
 mod h2service;
 pub use h2service::*;
 
+/// Authentification Error
 pub enum AuthError {
     Generic(Error),
     NoData,
@@ -51,7 +52,12 @@ impl From<Error> for AuthError {
     }
 }
 
+/// User Authentification trait
 pub trait ApiAuth {
+    /// Extract user credentials from headers and check them.
+    ///
+    /// If credenthials are valid, returns the username and a
+    /// [UserInformation] object to query additional user data.
     fn check_auth(
         &self,
         headers: &http::HeaderMap,
@@ -64,47 +70,64 @@ lazy_static::lazy_static!{
     static ref PSTART: u64 = PidStat::read_from_pid(Pid::from_raw(*PID)).unwrap().starttime;
 }
 
+/// Retruns the current process ID (see [libc::getpid])
+///
+/// The value is cached at startup (so it is invalid after a fork)
 pub fn pid() -> i32 {
     *PID
 }
 
+/// Returns the starttime of the process (see [PidStat])
+///
+/// The value is cached at startup (so it is invalid after a fork)
 pub fn pstart() -> u64 {
     *PSTART
 }
 
+/// Helper to write the PID into a file
 pub fn write_pid(pid_fn: &str) -> Result<(), Error> {
     let pid_str = format!("{}\n", *PID);
     proxmox::tools::fs::replace_file(pid_fn, pid_str.as_bytes(), CreateOptions::new())
 }
 
+/// Helper to read the PID from a file
 pub fn read_pid(pid_fn: &str) -> Result<i32, Error> {
     let pid = proxmox::tools::fs::file_get_contents(pid_fn)?;
     let pid = std::str::from_utf8(&pid)?.trim();
     pid.parse().map_err(|err| format_err!("could not parse pid - {}", err))
 }
 
+/// Returns the control socket path for a specific process ID.
+///
+/// Note: The control socket always uses @/run/proxmox-backup/ as
+/// prefix for historic reason. This does not matter because the
+/// generated path is unique for each ``pid`` anyways.
 pub fn ctrl_sock_from_pid(pid: i32) -> String {
     // Note: The control socket always uses @/run/proxmox-backup/ as prefix
     // for historc reason.
     format!("\0{}/control-{}.sock", "/run/proxmox-backup", pid)
 }
 
+/// Returns the control socket path for this server.
 pub fn our_ctrl_sock() -> String {
     ctrl_sock_from_pid(*PID)
 }
 
 static SHUTDOWN_REQUESTED: AtomicBool = AtomicBool::new(false);
 
+/// Request a server shutdown (usually called from [catch_shutdown_signal])
 pub fn request_shutdown() {
     SHUTDOWN_REQUESTED.store(true, Ordering::SeqCst);
     crate::server_shutdown();
 }
 
+/// Returns true if there was a shutdown request.
 #[inline(always)]
 pub fn shutdown_requested() -> bool {
     SHUTDOWN_REQUESTED.load(Ordering::SeqCst)
 }
 
+/// Raise an error if there was a shutdown request.
 pub fn fail_on_shutdown() -> Result<(), Error> {
     if shutdown_requested() {
         bail!("Server shutdown requested - aborting task");

proxmox-rest-server/src/state.rs

@@ -8,6 +8,8 @@ use tokio::signal::unix::{signal, SignalKind};
 
 use pbs_tools::broadcast_future::BroadcastData;
 
+use crate::request_shutdown;
+
 #[derive(PartialEq, Copy, Clone, Debug)]
 enum ServerMode {
     Normal,
@@ -35,6 +37,8 @@ lazy_static! {
 }
 
 /// Listen to ``SIGINT`` for server shutdown
+///
+/// This calls [request_shutdown] when receiving the signal.
 pub fn catch_shutdown_signal() -> Result<(), Error> {
 
     let mut stream = signal(SignalKind::interrupt())?;
@@ -43,7 +47,7 @@ pub fn catch_shutdown_signal() -> Result<(), Error> {
         while stream.recv().await.is_some() {
             log::info!("got shutdown request (SIGINT)");
             SERVER_STATE.lock().unwrap().reload_request = false;
-            crate::request_shutdown();
+            request_shutdown();
         }
     }.boxed();
 
@@ -56,6 +60,9 @@ pub fn catch_shutdown_signal() -> Result<(), Error> {
 }
 
 /// Listen to ``SIGHUP`` for server reload
+///
+/// This calls [request_shutdown] when receiving the signal, and tries
+/// to restart the server.
 pub fn catch_reload_signal() -> Result<(), Error> {
 
     let mut stream = signal(SignalKind::hangup())?;
@@ -76,13 +83,14 @@ pub fn catch_reload_signal() -> Result<(), Error> {
     Ok(())
 }
 
-pub fn is_reload_request() -> bool {
+pub(crate) fn is_reload_request() -> bool {
     let data = SERVER_STATE.lock().unwrap();
 
     data.mode == ServerMode::Shutdown && data.reload_request
 }
 
-pub fn server_shutdown() {
+
+pub(crate) fn server_shutdown() {
     let mut data = SERVER_STATE.lock().unwrap();
 
     log::info!("request_shutdown");
@@ -96,6 +104,7 @@ pub fn server_shutdown() {
     check_last_worker();
 }
 
+/// Future to signal server shutdown
 pub fn shutdown_future() -> impl Future<Output = ()> {
     let mut data = SERVER_STATE.lock().unwrap();
     data
@@ -104,18 +113,19 @@ pub fn shutdown_future() -> impl Future<Output = ()> {
         .map(|_| ())
 }
 
+/// Future to signal when last worker task finished
 pub fn last_worker_future() ->  impl Future<Output = Result<(), Error>> {
     let mut data = SERVER_STATE.lock().unwrap();
     data.last_worker_listeners.listen()
 }
 
-pub fn set_worker_count(count: usize) {
+pub(crate) fn set_worker_count(count: usize) {
     SERVER_STATE.lock().unwrap().worker_count = count;
 
     check_last_worker();
 }
 
-pub fn check_last_worker() {
+pub(crate) fn check_last_worker() {
     let mut data = SERVER_STATE.lock().unwrap();
 
     if !(data.mode == ServerMode::Shutdown && data.worker_count == 0 && data.internal_task_count == 0) { return; }

proxmox-rest-server/src/worker_task.rs

@@ -324,6 +324,14 @@ pub fn worker_is_active_local(upid: &UPID) -> bool {
     }
 }
 
+/// Register task control command on a [CommandoSocket].
+///
+/// This create two commands:
+///
+/// * ``worker-task-abort <UPID>``: calls [abort_local_worker]
+///
+/// * ``worker-task-status <UPID>``: return true of false, depending on
+/// whether the worker is running or stopped.
 pub fn register_task_control_commands(
     commando_sock: &mut CommandoSocket,
 ) -> Result<(), Error> {
@@ -358,14 +366,20 @@ pub fn register_task_control_commands(
     Ok(())
 }
 
-pub fn abort_worker_async(upid: UPID) {
+/// Try to abort a worker task, but do no wait
+///
+/// Errors (if any) are simply logged.
+pub fn abort_worker_nowait(upid: UPID) {
     tokio::spawn(async move {
         if let Err(err) = abort_worker(upid).await {
-            eprintln!("abort worker failed - {}", err);
+            log::error!("abort worker task failed - {}", err);
         }
     });
 }
 
+/// Abort a worker task
+///
+/// By sending ``worker-task-abort`` to the control socket.
 pub async fn abort_worker(upid: UPID) -> Result<(), Error> {
 
     let sock = crate::ctrl_sock_from_pid(upid.pid);
@@ -513,7 +527,7 @@ fn read_task_file<R: Read>(reader: R) -> Result<Vec<TaskListInfo>, Error>
                 state
             }),
             Err(err) => {
-                eprintln!("unable to parse worker status '{}' - {}", line, err);
+                log::warn!("unable to parse worker status '{}' - {}", line, err);
                 continue;
             }
         };
@@ -536,6 +550,7 @@ where
     read_task_file(file)
 }
 
+/// Iterate over existing/active worker tasks
 pub struct TaskListInfoIterator {
     list: VecDeque<TaskListInfo>,
     end: bool,
@@ -544,6 +559,7 @@ pub struct TaskListInfoIterator {
 }
 
 impl TaskListInfoIterator {
+    /// Creates a new iterator instance.
     pub fn new(active_only: bool) -> Result<Self, Error> {
 
         let setup = worker_task_setup()?;
@@ -811,8 +827,6 @@ impl WorkerTask {
 
     /// Request abort
     pub fn request_abort(&self) {
-        eprintln!("set abort flag for worker {}", self.upid);
-
         let prev_abort = self.abort_requested.swap(true, Ordering::SeqCst);
         if !prev_abort { // log abort one time
             self.log_message(format!("received abort request ..."));

src/api2/node/tasks.rs

@@ -374,7 +374,7 @@ fn stop_task(
         user_info.check_privs(&auth_id, &["system", "tasks"], PRIV_SYS_MODIFY, false)?;
     }
 
-    proxmox_rest_server::abort_worker_async(upid);
+    proxmox_rest_server::abort_worker_nowait(upid);
 
     Ok(Value::Null)
 }

tests/worker-task-abort.rs

@@ -95,7 +95,7 @@ fn worker_task_abort() -> Result<(), Error> {
             }
             Ok(wid) => {
                 println!("WORKER: {}", wid);
-                proxmox_rest_server::abort_worker_async(wid.parse::<UPID>().unwrap());
+                proxmox_rest_server::abort_worker_nowait(wid.parse::<UPID>().unwrap());
                 proxmox_rest_server::wait_for_local_worker(&wid).await.unwrap();
              }
         }