feat: add in-process standalone worker host

crates/standalone/tests/host.rs

@@ -0,0 +1,212 @@
+use std::collections::VecDeque;
+use std::pin::Pin;
+use std::sync::{Arc, Mutex};
+use std::time::Duration;
+
+use agen::llm_client::client::LlmClient;
+use agen::llm_client::error::ClientError;
+use agen::llm_client::event::{Event as LlmEvent, StopReason};
+use agen::llm_client::types::Request;
+use async_trait::async_trait;
+use futures::{Stream, stream};
+use protocol::{Event, Method};
+use standalone::{StandaloneHost, StandaloneLaunchConfig};
+use uuid::Uuid;
+
+#[derive(Clone)]
+struct ScriptedClient {
+    responses: Arc<Mutex<VecDeque<Vec<LlmEvent>>>>,
+    requests: Arc<Mutex<Vec<Request>>>,
+}
+
+impl ScriptedClient {
+    fn new(responses: Vec<Vec<LlmEvent>>) -> Self {
+        Self {
+            responses: Arc::new(Mutex::new(responses.into())),
+            requests: Arc::new(Mutex::new(Vec::new())),
+        }
+    }
+
+    fn requests(&self) -> Vec<Request> {
+        self.requests.lock().expect("requests lock").clone()
+    }
+}
+
+#[async_trait]
+impl LlmClient for ScriptedClient {
+    async fn stream(
+        &self,
+        request: Request,
+    ) -> Result<Pin<Box<dyn Stream<Item = Result<LlmEvent, ClientError>> + Send>>, ClientError>
+    {
+        self.requests.lock().expect("requests lock").push(request);
+        let response = self
+            .responses
+            .lock()
+            .expect("responses lock")
+            .pop_front()
+            .expect("scripted response");
+        Ok(Box::pin(stream::iter(response.into_iter().map(Ok))))
+    }
+
+    fn clone_boxed(&self) -> Box<dyn LlmClient> {
+        Box::new(self.clone())
+    }
+}
+
+#[tokio::test]
+async fn in_process_host_runs_text_and_read_tool_then_shuts_down() {
+    let temp = tempfile::tempdir().expect("tempdir");
+    std::fs::write(temp.path().join("probe.txt"), "standalone tool evidence\n")
+        .expect("write probe");
+    let worker_name = format!("standalone-{}", Uuid::now_v7());
+    let launch = StandaloneLaunchConfig::new(
+        temp.path(),
+        temp.path().join("state"),
+        manifest::ProfileSelector::Default,
+        &worker_name,
+    )
+    .resolve()
+    .expect("resolve standalone profile");
+
+    let client = ScriptedClient::new(vec![
+        vec![
+            LlmEvent::tool_use_start(0, "read-1", "Read"),
+            LlmEvent::tool_input_delta(0, r#"{"file_path":"probe.txt"}"#),
+            LlmEvent::tool_use_stop(0),
+        ],
+        vec![
+            LlmEvent::text_block_start(0),
+            LlmEvent::text_delta(0, "standalone response"),
+            LlmEvent::text_block_stop(0, Some(StopReason::EndTurn)),
+        ],
+    ]);
+    let inspection = client.clone();
+    let host = StandaloneHost::start_with_model_client(launch, client)
+        .await
+        .expect("start in-process host");
+    let mut events = host.subscribe();
+
+    host.send(Method::run_text("read the probe"))
+        .await
+        .expect("submit input");
+
+    tokio::time::timeout(Duration::from_secs(30), async {
+        let mut saw_text = false;
+        let mut saw_tool_result = false;
+        loop {
+            match events.recv().await.expect("worker event") {
+                Event::TextDelta { text } if text.contains("standalone response") => {
+                    saw_text = true;
+                }
+                Event::ToolResult { .. } => {
+                    saw_tool_result = true;
+                }
+                Event::RunEnd { .. } => {
+                    assert!(saw_text, "stream must expose the model text delta");
+                    assert!(saw_tool_result, "stream must expose the tool result");
+                    break;
+                }
+                _ => {}
+            }
+        }
+    })
+    .await
+    .expect("run completed");
+
+    let requests = inspection.requests();
+    assert_eq!(requests.len(), 2);
+    let tool_names = requests[0]
+        .tools
+        .iter()
+        .map(|tool| tool.name.as_str())
+        .collect::<Vec<_>>();
+    assert!(tool_names.contains(&"Read"));
+    assert!(tool_names.contains(&"TaskCreate"));
+    assert!(tool_names.contains(&"SubWorkerSpawn"));
+    assert!(format!("{:?}", requests[1].items).contains("standalone tool evidence"));
+    assert!(
+        !temp
+            .path()
+            .join("state/runtime")
+            .join(&worker_name)
+            .join("worker.sock")
+            .exists()
+    );
+
+    host.shutdown().await.expect("graceful shutdown");
+}
+
+#[tokio::test]
+async fn state_store_failure_is_redacted_and_starts_no_controller() {
+    let temp = tempfile::tempdir().expect("tempdir");
+    let state_path = temp.path().join("state-file-with-secret-name");
+    std::fs::write(&state_path, "not a directory").expect("write blocking file");
+    let launch = StandaloneLaunchConfig::new(
+        temp.path(),
+        &state_path,
+        manifest::ProfileSelector::Default,
+        format!("standalone-failure-{}", Uuid::now_v7()),
+    )
+    .resolve()
+    .expect("resolve launch");
+    let client = ScriptedClient::new(Vec::new());
+
+    let error = StandaloneHost::start_with_model_client(launch, client)
+        .await
+        .err()
+        .expect("state store startup rejected");
+    assert_eq!(error, standalone::StandaloneStartupError::StateStore);
+    assert_eq!(
+        error.to_string(),
+        "the standalone state store could not be opened"
+    );
+    assert!(!error.to_string().contains("secret-name"));
+    assert!(
+        !temp
+            .path()
+            .join("state-file-with-secret-name/runtime")
+            .exists()
+    );
+}
+
+#[test]
+fn standalone_crate_has_no_tui_runtime_or_workspace_server_dependency() {
+    let manifest = include_str!("../Cargo.toml");
+    let dependencies = manifest
+        .split("[dependencies]")
+        .nth(1)
+        .expect("dependencies section")
+        .split("[dev-dependencies]")
+        .next()
+        .expect("dependency body");
+    for forbidden in ["tui", "worker-runtime", "yoi-workspace-server"] {
+        assert!(
+            !dependencies.lines().any(|line| {
+                line.split_once('=')
+                    .is_some_and(|(name, _)| name.trim() == forbidden)
+            }),
+            "standalone must not depend on {forbidden}"
+        );
+    }
+}
+
+#[test]
+fn launch_rejects_path_profile_before_worker_startup() {
+    let temp = tempfile::tempdir().expect("tempdir");
+    let error = StandaloneLaunchConfig::new(
+        temp.path(),
+        temp.path().join("state"),
+        manifest::ProfileSelector::Path {
+            path: temp.path().join("profile.dcdl"),
+        },
+        "standalone-path-profile",
+    )
+    .resolve()
+    .err()
+    .expect("path profile rejected");
+    assert_eq!(
+        error,
+        standalone::StandaloneLaunchError::PathProfileUnsupported
+    );
+}