Respond to the connect message from a devtools client (#35745)

* Respond to the "connect" message

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

* Bump log levels in devtools implementation a bit

If everything is "debug" then nothing stands out.

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

---------

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

components/devtools/actor.rs

@@ -10,7 +10,7 @@ use std::net::TcpStream;
 use std::sync::{Arc, Mutex};
 
 use base::cross_process_instant::CrossProcessInstant;
-use log::{debug, warn};
+use log::debug;
 use serde_json::{Map, Value};
 
 /// General actor system infrastructure.
@@ -175,21 +175,22 @@ impl ActorRegistry {
         let to = match msg.get("to") {
             Some(to) => to.as_str().unwrap(),
             None => {
-                warn!("Received unexpected message: {:?}", msg);
+                log::warn!("Received unexpected message: {:?}", msg);
                 return Err(());
             },
         };
 
         match self.actors.get(to) {
-            None => debug!("message received for unknown actor \"{}\"", to),
+            None => log::warn!("message received for unknown actor \"{}\"", to),
             Some(actor) => {
                 let msg_type = msg.get("type").unwrap().as_str().unwrap();
                 if actor.handle_message(self, msg_type, msg, stream, id)? !=
                     ActorMessageStatus::Processed
                 {
-                    debug!(
+                    log::warn!(
                         "unexpected message type \"{}\" found for actor \"{}\"",
-                        msg_type, to
+                        msg_type,
+                        to
                     );
                 }
             },

components/devtools/actors/root.rs

@@ -12,7 +12,7 @@
 use std::net::TcpStream;
 
 use serde::Serialize;
-use serde_json::{Map, Value};
+use serde_json::{json, Map, Value};
 
 use crate::actor::{Actor, ActorMessageStatus, ActorRegistry};
 use crate::actors::device::DeviceActor;
@@ -145,6 +145,13 @@ impl Actor for RootActor {
         _id: StreamId,
     ) -> Result<ActorMessageStatus, ()> {
         Ok(match msg_type {
+            "connect" => {
+                let message = json!({
+                    "from": "root",
+                });
+                let _ = stream.write_json_packet(&message);
+                ActorMessageStatus::Processed
+            },
             "listAddons" => {
                 let actor = ListAddonsReply {
                     from: "root".to_owned(),

components/devtools/lib.rs

@@ -28,7 +28,7 @@ use devtools_traits::{
 };
 use embedder_traits::{AllowOrDeny, EmbedderMsg, EmbedderProxy};
 use ipc_channel::ipc::{self, IpcSender};
-use log::{debug, trace, warn};
+use log::trace;
 use serde::Serialize;
 use servo_rand::RngCore;
 
@@ -650,10 +650,10 @@ fn allow_devtools_client(stream: &mut TcpStream, embedder: &EmbedderProxy, token
 
 /// Process the input from a single devtools client until EOF.
 fn handle_client(actors: Arc<Mutex<ActorRegistry>>, mut stream: TcpStream, id: StreamId) {
-    debug!("connection established to {}", stream.peer_addr().unwrap());
+    log::info!("Connection established to {}", stream.peer_addr().unwrap());
     let msg = actors.lock().unwrap().find::<RootActor>("root").encodable();
     if let Err(e) = stream.write_json_packet(&msg) {
-        warn!("Error writing response: {:?}", e);
+        log::warn!("Error writing response: {:?}", e);
         return;
     }
 
@@ -665,17 +665,17 @@ fn handle_client(actors: Arc<Mutex<ActorRegistry>>, mut stream: TcpStream, id: S
                     &mut stream,
                     id,
                 ) {
-                    debug!("error: devtools actor stopped responding");
+                    log::error!("Devtools actor stopped responding");
                     let _ = stream.shutdown(Shutdown::Both);
                     break;
                 }
             },
             Ok(None) => {
-                debug!("error: EOF");
+                log::info!("Devtools connection closed");
                 break;
             },
             Err(err_msg) => {
-                debug!("error: {}", err_msg);
+                log::error!("Failed to read message from devtools client: {}", err_msg);
                 break;
             },
         }