Some debug derivations and implementations (#545)

This is just to be able to stick tracing::instrument in places, it's
especially useful to be able to do this on TypedSocketSender::send

plane/src/drone/docker/mod.rs

@@ -17,7 +17,7 @@ pub mod types;
 /// The existence of this label is used to determine whether a container is managed by Plane.
 const PLANE_DOCKER_LABEL: &str = "dev.plane.backend";
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct PlaneDocker {
     docker: Docker,
     runtime: Option<String>,

plane/src/typed_socket/mod.rs

@@ -30,6 +30,12 @@ pub struct TypedSocketSender<A> {
         Arc<dyn Fn(SocketAction<A>) -> Result<(), TypedSocketError> + 'static + Send + Sync>,
 }
 
+impl<T> Debug for TypedSocketSender<T> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str("typed socket sender")
+    }
+}
+
 #[derive(Debug, thiserror::Error)]
 pub enum TypedSocketError {
     #[error("Socket closed")]
@@ -47,7 +53,7 @@ impl<A> From<TrySendError<A>> for TypedSocketError {
     }
 }
 
-impl<A> TypedSocketSender<A> {
+impl<A: Debug> TypedSocketSender<A> {
     pub fn send(&self, message: A) -> Result<(), TypedSocketError> {
         (self.inner_send)(SocketAction::Send(message))?;
         Ok(())

plane/src/util.rs

@@ -137,6 +137,7 @@ impl Default for ExponentialBackoff {
     }
 }
 
+#[derive(Debug)]
 pub struct GuardHandle {
     handle: JoinHandle<()>,
 }