Update process initiator to make shelly-timeout doable

bffhd/initiators/mod.rs

@@ -51,6 +51,10 @@ impl InitiatorCallbacks {
         self.resource.try_update(session, status).await
     }
 
+    pub fn set_status(&mut self, status: Status) {
+        self.resource.set_status(status)
+    }
+
     pub fn open_session(&self, uid: &str) -> Option<SessionHandle> {
         self.sessions.open(&self.span, uid)
     }

bffhd/initiators/process.rs

@@ -2,7 +2,7 @@ use super::Initiator;
 use super::InitiatorCallbacks;
 use crate::resources::state::State;
 use crate::utils::linebuffer::LineBuffer;
-use async_process::{Child, ChildStdout, Command, Stdio};
+use async_process::{Child, ChildStderr, ChildStdout, Command, Stdio};
 use futures_lite::{ready, AsyncRead};
 use miette::{miette, IntoDiagnostic};
 use serde::{Deserialize, Serialize};
@@ -11,11 +11,12 @@ use std::future::Future;
 use std::io;
 use std::pin::Pin;
 use std::task::{Context, Poll};
+use crate::resources::modules::fabaccess::Status;
 
 #[derive(Debug, Serialize, Deserialize)]
 pub enum InputMessage {
     #[serde(rename = "state")]
-    SetState(State),
+    SetState(Status),
 }
 
 #[derive(Serialize, Deserialize)]
@@ -26,6 +27,7 @@ pub struct Process {
     pub args: Vec<String>,
     state: Option<ProcessState>,
     buffer: LineBuffer,
+    err_buffer: LineBuffer,
     callbacks: InitiatorCallbacks,
 }
 
@@ -42,6 +44,10 @@ impl Process {
                 .stdout
                 .take()
                 .expect("Child just spawned with piped stdout has no stdout"),
+            child
+                .stderr
+                .take()
+                .expect("Child just spawned with piped stderr has no stderr"),
             child,
         ));
         Ok(())
@@ -49,13 +55,15 @@ impl Process {
 }
 
 struct ProcessState {
-    pub child: Child,
     pub stdout: ChildStdout,
+    pub stderr: ChildStderr,
+    pub stderr_closed: bool,
+    pub child: Child,
 }
 
 impl ProcessState {
-    pub fn new(stdout: ChildStdout, child: Child) -> Self {
-        Self { stdout, child }
+    pub fn new(stdout: ChildStdout, stderr: ChildStderr, child: Child) -> Self {
+        Self { stdout, stderr, stderr_closed: false, child }
     }
 
     fn try_process(&mut self, buffer: &[u8], callbacks: &mut InitiatorCallbacks) -> usize {
@@ -77,13 +85,26 @@ impl ProcessState {
     }
 
     fn process_line(&mut self, line: &[u8], callbacks: &mut InitiatorCallbacks) {
-        match serde_json::from_slice::<InputMessage>(line) {
+        if !line.is_empty() {
+            let res = std::str::from_utf8(line);
+            if let Err(error) = &res {
+                tracing::warn!(%error, "Initiator sent line with invalid UTF-8");
+                return;
+            }
+            let string = res.unwrap().trim();
+            // Ignore whitespace-only lines
+            if !string.is_empty() {
+                match serde_json::from_str::<InputMessage>(res.unwrap()) {
                     Ok(state) => {
                         tracing::trace!(?state, "got new state for process initiator");
+                        let InputMessage::SetState(status) = state;
+                        callbacks.set_status(status);
                     }
                     Err(error) => tracing::warn!(%error, "process initiator did not send a valid line"),
                 }
             }
+        }
+    }
 }
 
 impl Future for Process {
@@ -93,6 +114,7 @@ impl Future for Process {
         if let Process {
             state: Some(state),
             buffer,
+            err_buffer,
             callbacks,
             ..
         } = self.get_mut()
@@ -129,6 +151,44 @@ impl Future for Process {
                     let processed = state.try_process(buffer, callbacks);
                     buffer.consume(processed);
 
+                    if !state.stderr_closed {
+                        let stderr = &mut state.stderr;
+                        loop {
+                            let buf = err_buffer.get_mut_write(512);
+                            match AsyncRead::poll_read(Pin::new(stderr), cx, buf) {
+                                Poll::Pending => break,
+                                Poll::Ready(Ok(read)) => {
+                                    err_buffer.advance_valid(read);
+                                    continue;
+                                }
+                                Poll::Ready(Err(error)) => {
+                                    tracing::warn!(%error, "reading from child stderr errored");
+                                    state.stderr_closed = true;
+                                    break;
+                                }
+                            }
+                        }
+                    }
+
+                    {
+                        let mut consumed = 0;
+
+                        while let Some(idx) = buffer[consumed..].iter().position(|b| *b == b'\n') {
+                            if idx == 0 {
+                                consumed += 1;
+                                continue;
+                            }
+                            let line = &buffer[consumed..(consumed + idx)];
+                            match std::str::from_utf8(line) {
+                                Ok(line) => tracing::debug!(line, "initiator STDERR"),
+                                Err(error) => tracing::debug!(%error,
+                                    "invalid UTF-8 on initiator STDERR"),
+                            }
+                            consumed = idx;
+                        }
+                        err_buffer.consume(consumed);
+                    }
+
                     return Poll::Pending;
                 }
             }
@@ -158,6 +218,7 @@ impl Initiator for Process {
             args,
             state: None,
             buffer: LineBuffer::new(),
+            err_buffer: LineBuffer::new(),
             callbacks,
         };
         this.spawn().into_diagnostic()?;

bffhd/resources/mod.rs

@@ -166,7 +166,7 @@ impl Resource {
         self.inner.set_state(archived)
     }
 
-    fn set_status(&self, state: Status) {
+    pub fn set_status(&self, state: Status) {
         let old = self.inner.get_state();
         let oldref: &Archived<State> = old.as_ref();
         let previous: &Archived<Option<UserRef>> = &oldref.inner.previous;