servo/components/devtools/lib.rs

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

//! An actor-based remote devtools server implementation. Only tested with
//! nightly Firefox versions at time of writing. Largely based on
//! reverse-engineering of Firefox chrome devtool logs and reading of
//! [code](http://mxr.mozilla.org/mozilla-central/source/toolkit/devtools/server/).

#![crate_name = "devtools"]
#![crate_type = "rlib"]

#![feature(box_syntax, core, rustc_private)]
#![feature(collections)]

#![allow(non_snake_case)]

#[macro_use]
extern crate log;

extern crate collections;
extern crate core;
extern crate devtools_traits;
extern crate rustc_serialize;
extern crate msg;
extern crate time;
extern crate util;
extern crate url;
extern crate hyper;

use actor::{Actor, ActorRegistry};
use actors::console::ConsoleActor;
use actors::network_event::{NetworkEventActor, EventActor, ResponseStartMsg};
use actors::worker::WorkerActor;
use actors::inspector::InspectorActor;
use actors::root::RootActor;
use actors::tab::TabActor;
use actors::timeline::TimelineActor;
use protocol::JsonPacketStream;

use devtools_traits::{ConsoleMessage, DevtoolsControlMsg, NetworkEvent};
use devtools_traits::{DevtoolsPageInfo, DevtoolScriptControlMsg};
use msg::constellation_msg::{PipelineId, WorkerId};
use util::task::spawn_named;

use std::borrow::ToOwned;
use std::cell::RefCell;
use std::collections::HashMap;
use std::collections::hash_map::Entry::{Occupied, Vacant};
use std::error::Error;
use std::sync::mpsc::{channel, Receiver, Sender, RecvError};
use std::net::{TcpListener, TcpStream, Shutdown};
use std::sync::{Arc, Mutex};
use time::precise_time_ns;

use url::Url;

use hyper::header::Headers;
use hyper::http::RawStatus;
use hyper::method::Method;

mod actor;
/// Corresponds to http://mxr.mozilla.org/mozilla-central/source/toolkit/devtools/server/actors/
mod actors {
    pub mod console;
    pub mod framerate;
    pub mod memory;
    pub mod inspector;
    pub mod root;
    pub mod tab;
    pub mod timeline;
    pub mod worker;
    pub mod network_event;
}
mod protocol;

#[derive(RustcEncodable)]
struct ConsoleAPICall {
    from: String,
    __type__: String,
    message: ConsoleMsg,
}

#[derive(RustcEncodable)]
struct ConsoleMsg {
    level: String,
    timeStamp: u64,
    arguments: Vec<String>,
    filename: String,
    lineNumber: u32,
    columnNumber: u32,
}

#[derive(RustcEncodable)]
struct NetworkEventMsg {
    from: String,
    __type__: String,
    eventActor: EventActor,
}

#[derive(RustcEncodable)]
struct NetworkEventUpdateMsg {
    from: String,
    __type__: String,
    updateType: String,
    response: ResponseStartMsg,
}

/// Spin up a devtools server that listens for connections on the specified port.
pub fn start_server(port: u16) -> Sender<DevtoolsControlMsg> {
    let (sender, receiver) = channel();
    {
        let sender = sender.clone();
        spawn_named("Devtools".to_owned(), move || {
            run_server(sender, receiver, port)
        });
    }
    sender
}

fn run_server(sender: Sender<DevtoolsControlMsg>,
              receiver: Receiver<DevtoolsControlMsg>,
              port: u16) {
    let listener = TcpListener::bind(&("127.0.0.1", port)).unwrap();

    let mut registry = ActorRegistry::new();

    let root = box RootActor {
        tabs: vec!(),
    };

    registry.register(root);
    registry.find::<RootActor>("root");

    let actors = registry.create_shareable();

    let mut accepted_connections: Vec<TcpStream> = Vec::new();

    let mut actor_pipelines: HashMap<PipelineId, String> = HashMap::new();
    let mut actor_requests: HashMap<String, String> = HashMap::new();

    let mut actor_workers: HashMap<(PipelineId, WorkerId), String> = HashMap::new();


    /// Process the input from a single devtools client until EOF.
    fn handle_client(actors: Arc<Mutex<ActorRegistry>>, mut stream: TcpStream) {
        println!("connection established to {}", stream.peer_addr().unwrap());
        {
            let actors = actors.lock().unwrap();
            let msg = actors.find::<RootActor>("root").encodable();
            stream.write_json_packet(&msg);
        }

        'outer: loop {
            match stream.read_json_packet() {
                Ok(Some(json_packet)) => {
                    match actors.lock().unwrap().handle_message(json_packet.as_object().unwrap(),
                                                                &mut stream) {
                        Ok(()) => {},
                        Err(()) => {
                            println!("error: devtools actor stopped responding");
                            let _ = stream.shutdown(Shutdown::Both);
                            break 'outer
                        }
                    }
                }
                Ok(None) => {
                    println!("error: EOF");
                    break 'outer
                }
                Err(e) => {
                    println!("error: {}", e.description());
                    break 'outer
                }
            }
        }
    }

    // We need separate actor representations for each script global that exists;
    // clients can theoretically connect to multiple globals simultaneously.
    // TODO: move this into the root or tab modules?
    fn handle_new_global(actors: Arc<Mutex<ActorRegistry>>,
                         ids: (PipelineId, Option<WorkerId>),
                         scriptSender: Sender<DevtoolScriptControlMsg>,
                         actor_pipelines: &mut HashMap<PipelineId, String>,
                         actor_workers: &mut HashMap<(PipelineId, WorkerId), String>,
                         page_info: DevtoolsPageInfo) {
        let mut actors = actors.lock().unwrap();

        let (pipeline, worker_id) = ids;

        //TODO: move all this actor creation into a constructor method on TabActor
        let (tab, console, inspector, timeline) = {
            let console = ConsoleActor {
                name: actors.new_name("console"),
                script_chan: scriptSender.clone(),
                pipeline: pipeline,
                streams: RefCell::new(Vec::new()),
            };
            let inspector = InspectorActor {
                name: actors.new_name("inspector"),
                walker: RefCell::new(None),
                pageStyle: RefCell::new(None),
                highlighter: RefCell::new(None),
                script_chan: scriptSender.clone(),
                pipeline: pipeline,
            };

            let timeline = TimelineActor::new(actors.new_name("timeline"),
                                              pipeline,
                                              scriptSender);

            let DevtoolsPageInfo { title, url } = page_info;
            let tab = TabActor {
                name: actors.new_name("tab"),
                title: title,
                url: url.serialize(),
                console: console.name(),
                inspector: inspector.name(),
                timeline: timeline.name(),
            };

            let root = actors.find_mut::<RootActor>("root");
            root.tabs.push(tab.name.clone());
            (tab, console, inspector, timeline)
        };

        if let Some(id) = worker_id {
            let worker = WorkerActor {
                name: actors.new_name("worker"),
                id: id,
            };
            actor_workers.insert((pipeline, id), worker.name.clone());
            actors.register(box worker);
        }

        actor_pipelines.insert(pipeline, tab.name.clone());
        actors.register(box tab);
        actors.register(box console);
        actors.register(box inspector);
        actors.register(box timeline);
    }

    fn handle_console_message(actors: Arc<Mutex<ActorRegistry>>,
                              id: PipelineId,
                              console_message: ConsoleMessage,
                              actor_pipelines: &HashMap<PipelineId, String>) {
        let console_actor_name = find_console_actor(actors.clone(), id, actor_pipelines);
        let actors = actors.lock().unwrap();
        let console_actor = actors.find::<ConsoleActor>(&console_actor_name);
        match console_message {
            ConsoleMessage::LogMessage(message, filename, lineNumber, columnNumber) => {
                let msg = ConsoleAPICall {
                    from: console_actor.name.clone(),
                    __type__: "consoleAPICall".to_string(),
                    message: ConsoleMsg {
                        level: "log".to_string(),
                        timeStamp: precise_time_ns(),
                        arguments: vec!(message),
                        filename: filename,
                        lineNumber: lineNumber,
                        columnNumber: columnNumber,
                    },
                };
                for stream in console_actor.streams.borrow_mut().iter_mut() {
                    stream.write_json_packet(&msg);
                }
            }
        }
    }

    fn find_console_actor(actors: Arc<Mutex<ActorRegistry>>,
                          id: PipelineId,
                          actor_pipelines: &HashMap<PipelineId, String>) -> String {
        let actors = actors.lock().unwrap();
        let ref tab_actor_name = (*actor_pipelines)[&id];
        let tab_actor = actors.find::<TabActor>(tab_actor_name);
        let console_actor_name = tab_actor.console.clone();
        return console_actor_name;
    }

    fn find_first_console_actor(actors: Arc<Mutex<ActorRegistry>>) -> String {
        let actors = actors.lock().unwrap();
        let root = actors.find::<RootActor>("root");
        let ref tab_actor_name = root.tabs[0];
        let tab_actor = actors.find::<TabActor>(tab_actor_name);
        let console_actor_name = tab_actor.console.clone();
        return console_actor_name;
    }
    
    fn find_network_event_actor(actors: Arc<Mutex<ActorRegistry>>,
                                  actor_requests: &mut HashMap<String, String>,
                                  request_id: String) -> String {
        let mut actors = actors.lock().unwrap();
        match (*actor_requests).entry(request_id) {
            Occupied(name) => {
                name.into_mut().clone()
            }
            Vacant(entry) => {
                println!("not found");
                let actor_name = actors.new_name("netevent");
                let actor = NetworkEventActor::new(actor_name.clone());
                entry.insert(actor_name.clone());
                actors.register(box actor);
                actor_name
            }
        }
    }

    fn handle_network_event(actors: Arc<Mutex<ActorRegistry>>,
                            mut accepted_connections: Vec<TcpStream>,
                            actor_requests: &mut HashMap<String, String>,
                            request_id: String,
                            network_event: NetworkEvent) {

        let console_actor_name = find_first_console_actor(actors.clone());
        let netevent_actor_name = find_network_event_actor(actors.clone(), actor_requests, request_id.clone());
        let mut actors = actors.lock().unwrap();
        let actor = actors.find_mut::<NetworkEventActor>(&netevent_actor_name);

        match network_event {
            NetworkEvent::HttpRequest(..) => {
                actor.addEvent(network_event);
                let msg = NetworkEventMsg {
                    from: console_actor_name,
                    __type__: "networkEvent".to_string(),
                    eventActor: actor.get_event_actor(),
                };
                for stream in accepted_connections.iter_mut() {
                    stream.write_json_packet(&msg);
                }
            }

            NetworkEvent::HttpResponse(..) => {
                println!("Network event response");
                actor.addEvent(network_event);
                let msg = NetworkEventUpdateMsg {
                    from: netevent_actor_name,
                    __type__: "networkEventUpdate".to_string(),
                    updateType: "responseStart".to_string(),
                    response: actor.get_response_start()
                };

                for stream in accepted_connections.iter_mut() {
                    stream.write_json_packet(&msg);
                }
            }
        }
    }

    spawn_named("DevtoolsClientAcceptor".to_owned(), move || {
        // accept connections and process them, spawning a new task for each one
        for stream in listener.incoming() {
            // connection succeeded
            sender.send(DevtoolsControlMsg::AddClient(stream.unwrap())).unwrap();
        }
    });

    loop {
        match receiver.recv() {
            Ok(DevtoolsControlMsg::AddClient(stream)) => {
                let actors = actors.clone();
                accepted_connections.push(stream.try_clone().unwrap());
                spawn_named("DevtoolsClientHandler".to_owned(), move || {
                    handle_client(actors, stream.try_clone().unwrap())
                })
            }
            Ok(DevtoolsControlMsg::ServerExitMsg) | Err(RecvError) => break,
            Ok(DevtoolsControlMsg::NewGlobal(ids, scriptSender, pageinfo)) =>
                handle_new_global(actors.clone(), ids, scriptSender, &mut actor_pipelines,
                                  &mut actor_workers, pageinfo),
            Ok(DevtoolsControlMsg::SendConsoleMessage(id, console_message)) =>
                handle_console_message(actors.clone(), id, console_message,
                                       &actor_pipelines),

            Ok(DevtoolsControlMsg::NetworkEventMessage(request_id, network_event)) => {
                // copy the accepted_connections vector
                let mut connections = Vec::<TcpStream>::new();
                for stream in accepted_connections.iter() {
                    connections.push(stream.try_clone().unwrap());
                }
                handle_network_event(actors.clone(), connections, &mut actor_requests, request_id, network_event);
            }
        }
    }

    for connection in accepted_connections.iter_mut() {
        let _ = connection.shutdown(Shutdown::Both);
    }
}