hive-c0re: admin socket server + client (stub dispatch)

hive-c0re/src/server.rs

@@ -0,0 +1,70 @@
+use std::path::Path;
+
+use anyhow::{Context, Result};
+use hive_sh4re::{HostRequest, HostResponse};
+use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader};
+use tokio::net::{UnixListener, UnixStream};
+
+pub async fn serve(socket: &Path, agent_flake: &str) -> Result<()> {
+    if let Some(parent) = socket.parent() {
+        std::fs::create_dir_all(parent)
+            .with_context(|| format!("create socket parent {}", parent.display()))?;
+    }
+    if socket.exists() {
+        std::fs::remove_file(socket).context("remove stale socket")?;
+    }
+
+    let listener = UnixListener::bind(socket)
+        .with_context(|| format!("bind admin socket {}", socket.display()))?;
+    tracing::info!(socket = %socket.display(), %agent_flake, "hive-c0re listening");
+
+    loop {
+        let (stream, _) = listener.accept().await.context("accept connection")?;
+        let agent_flake = agent_flake.to_owned();
+        tokio::spawn(async move {
+            if let Err(e) = handle(stream, &agent_flake).await {
+                tracing::warn!(error = ?e, "connection failed");
+            }
+        });
+    }
+}
+
+async fn handle(stream: UnixStream, agent_flake: &str) -> Result<()> {
+    let (read, mut write) = stream.into_split();
+    let mut reader = BufReader::new(read);
+    let mut line = String::new();
+
+    loop {
+        line.clear();
+        let n = reader.read_line(&mut line).await?;
+        if n == 0 {
+            return Ok(());
+        }
+        let resp = match serde_json::from_str::<HostRequest>(line.trim()) {
+            Ok(req) => dispatch(&req, agent_flake).await,
+            Err(e) => HostResponse::error(format!("parse error: {e}")),
+        };
+        let mut payload = serde_json::to_string(&resp)?;
+        payload.push('\n');
+        write.write_all(payload.as_bytes()).await?;
+        write.flush().await?;
+    }
+}
+
+async fn dispatch(req: &HostRequest, _agent_flake: &str) -> HostResponse {
+    match req {
+        HostRequest::Spawn { name } => {
+            tracing::info!(%name, "spawn (stub)");
+            HostResponse::error("spawn: nixos-container integration pending")
+        }
+        HostRequest::Kill { name } => {
+            tracing::info!(%name, "kill (stub)");
+            HostResponse::error("kill: nixos-container integration pending")
+        }
+        HostRequest::Rebuild { name } => {
+            tracing::info!(%name, "rebuild (stub)");
+            HostResponse::error("rebuild: nixos-container integration pending")
+        }
+        HostRequest::List => HostResponse::list(Vec::new()),
+    }
+}