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use std::io;
use std::process::Stdio;
use tokio::io::{AsyncBufReadExt, BufReader};
use tokio::process::{Child, Command};
use tokio::sync::mpsc::UnboundedSender;
use tokio::task::JoinHandle;
use uuid::Uuid;
use crate::session::{MonitorEvent, TranscriptEvent};
pub struct MonitorRunner {
pub task_id: String,
pub description: String,
handle: JoinHandle<()>,
}
impl MonitorRunner {
pub fn spawn(
command: impl Into<String>,
description: impl Into<String>,
tx: UnboundedSender<TranscriptEvent>,
) -> io::Result<Self> {
let command = command.into();
let description = description.into();
let task_id = format!("mon-{}", &Uuid::new_v4().simple().to_string()[..8]);
let mut child = Command::new("sh")
.arg("-c")
.arg(&command)
.stdout(Stdio::piped())
.stderr(Stdio::piped())
.kill_on_drop(true)
.spawn()?;
let stdout = child.stdout.take().expect("monitor stdout piped");
let stderr = child.stderr.take().expect("monitor stderr piped");
tokio::spawn(async move {
let mut lines = BufReader::new(stderr).lines();
while let Ok(Some(line)) = lines.next_line().await {
eprintln!(
"{}",
serde_json::json!({
"level": "info",
"event": "monitor.stderr",
"line": line,
})
);
}
});
let task_id_for_task = task_id.clone();
let description_for_task = description.clone();
let handle = tokio::spawn(async move {
let mut lines = BufReader::new(stdout).lines();
loop {
match lines.next_line().await {
Ok(Some(line)) => {
let event = MonitorEvent {
task_id: task_id_for_task.clone(),
description: description_for_task.clone(),
event: line,
source_uuid: Uuid::new_v4().to_string(),
delivery_id: Uuid::new_v4().to_string(),
human_turn: false,
note: None,
};
let _ = tx.send(TranscriptEvent::MonitorEvent(event.clone()));
let _ = tx.send(TranscriptEvent::MonitorConsumed {
event,
reason: "absorbed_mid_turn".to_string(),
});
}
Ok(None) => break,
Err(error) => {
eprintln!(
"{}",
serde_json::json!({
"level": "error",
"event": "monitor.read_failed",
"error": error.to_string(),
})
);
break;
}
}
}
let _ = wait_child(&mut child).await;
});
Ok(Self {
task_id,
description,
handle,
})
}
pub fn abort(&self) {
self.handle.abort();
}
pub async fn wait(self) {
let _ = self.handle.await;
}
pub async fn finish(mut self, grace: std::time::Duration) {
if tokio::time::timeout(grace, &mut self.handle).await.is_err() {
self.handle.abort();
}
}
}
async fn wait_child(child: &mut Child) -> io::Result<std::process::ExitStatus> {
child.wait().await
}
#[cfg(test)]
mod tests {
use std::fs;
use super::*;
use crate::session::harnesses::claude_code_cli::ClaudeCodeCliHarness;
use crate::session::SessionLogger;
#[tokio::test]
async fn monitor_stdout_becomes_task_notification_records() {
let temp = tempfile::tempdir().unwrap();
let cwd = temp.path().join("work");
fs::create_dir_all(&cwd).unwrap();
let root = temp.path().join("claude");
let harness = ClaudeCodeCliHarness::create(Some(&root), &cwd, "test-model").unwrap();
let session = SessionLogger::start(vec![Box::new(harness)], "alice").unwrap();
let path = session.session_file().to_path_buf();
let tx = session.transcript_sender();
let runner = MonitorRunner::spawn("printf '%s\\n' one two", "monitor & test", tx).unwrap();
runner.wait().await;
session.close().await;
let records: Vec<serde_json::Value> = fs::read_to_string(&path)
.unwrap()
.lines()
.map(|line| serde_json::from_str(line).unwrap())
.collect();
assert_eq!(records.len(), 6);
for chunk in records.chunks(3) {
assert_eq!(chunk[0]["type"], "queue-operation");
assert_eq!(chunk[0]["operation"], "enqueue");
assert_eq!(chunk[1]["type"], "attachment");
assert_eq!(chunk[1]["attachment"]["type"], "queued_command");
assert_eq!(chunk[2]["type"], "queue-operation");
assert_eq!(chunk[2]["operation"], "remove");
assert_eq!(
chunk[2]["commandUuid"],
chunk[1]["attachment"]["source_uuid"]
);
assert_eq!(
chunk[2]["deliveryId"],
chunk[1]["attachment"]["delivery_id"]
);
}
let content = records[0]["content"].as_str().unwrap();
assert!(content.contains("monitor & test"));
assert!(content.contains("one"));
}
}
