refactor(#2352): extract standalone hivectl crate, hive-c0re daemon-only

hivectl/src/client.rs

@@ -0,0 +1,27 @@
+use std::path::Path;
+
+use anyhow::{Context, Result, bail};
+use hive_host_sock::{HostRequest, HostResponse};
+use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader};
+use tokio::net::UnixStream;
+
+pub async fn request(socket: &Path, req: HostRequest) -> Result<HostResponse> {
+    let stream = UnixStream::connect(socket)
+        .await
+        .with_context(|| format!("connect to {}", socket.display()))?;
+    let (read, mut write) = stream.into_split();
+
+    let mut payload = serde_json::to_string(&req)?;
+    payload.push('\n');
+    write.write_all(payload.as_bytes()).await?;
+    write.flush().await?;
+
+    let mut reader = BufReader::new(read);
+    let mut line = String::new();
+    reader.read_line(&mut line).await?;
+    if line.is_empty() {
+        bail!("server closed connection without responding");
+    }
+    let resp: HostResponse = serde_json::from_str(line.trim())?;
+    Ok(resp)
+}