mirror of
https://github.com/denoland/deno.git
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735 lines
23 KiB
Rust
735 lines
23 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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//! The documentation for the inspector API is sparse, but these are helpful:
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//! <https://chromedevtools.github.io/devtools-protocol/>
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//! <https://hyperandroid.com/2020/02/12/v8-inspector-from-an-embedder-standpoint/>
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use crate::error::generic_error;
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use crate::futures::channel::mpsc;
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use crate::futures::channel::mpsc::UnboundedReceiver;
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use crate::futures::channel::mpsc::UnboundedSender;
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use crate::futures::channel::oneshot;
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use crate::futures::future::select;
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use crate::futures::future::Either;
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use crate::futures::future::Future;
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use crate::futures::prelude::*;
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use crate::futures::stream::SelectAll;
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use crate::futures::stream::StreamExt;
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use crate::futures::task;
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use crate::futures::task::Context;
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use crate::futures::task::Poll;
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use crate::serde_json;
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use crate::serde_json::json;
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use crate::serde_json::Value;
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use anyhow::Error;
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use parking_lot::Mutex;
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use std::cell::BorrowMutError;
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use std::cell::RefCell;
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use std::collections::HashMap;
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use std::ffi::c_void;
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use std::mem::take;
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use std::mem::MaybeUninit;
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use std::pin::Pin;
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use std::ptr;
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use std::ptr::NonNull;
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use std::rc::Rc;
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use std::sync::Arc;
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use std::thread;
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pub enum InspectorMsgKind {
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Notification,
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Message(i32),
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}
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pub struct InspectorMsg {
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pub kind: InspectorMsgKind,
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pub content: String,
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}
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pub type SessionProxySender = UnboundedSender<InspectorMsg>;
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pub type SessionProxyReceiver = UnboundedReceiver<String>;
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/// Encapsulates an UnboundedSender/UnboundedReceiver pair that together form
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/// a duplex channel for sending/receiving messages in V8 session.
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pub struct InspectorSessionProxy {
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pub tx: SessionProxySender,
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pub rx: SessionProxyReceiver,
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}
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#[derive(Clone, Copy)]
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enum PollState {
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Idle,
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Woken,
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Polling,
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Parked,
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Dropped,
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}
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/// This structure is used responsible for providing inspector interface
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/// to the `JsRuntime`.
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///
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/// It stores an instance of `v8::inspector::V8Inspector` and additionally
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/// implements `v8::inspector::V8InspectorClientImpl`.
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///
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/// After creating this structure it's possible to connect multiple sessions
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/// to the inspector, in case of Deno it's either: a "websocket session" that
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/// provides integration with Chrome Devtools, or an "in-memory session" that
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/// is used for REPL or converage collection.
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pub struct JsRuntimeInspector {
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v8_inspector_client: v8::inspector::V8InspectorClientBase,
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v8_inspector: Rc<RefCell<v8::UniquePtr<v8::inspector::V8Inspector>>>,
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new_session_tx: UnboundedSender<InspectorSessionProxy>,
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sessions: RefCell<SessionContainer>,
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flags: RefCell<InspectorFlags>,
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waker: Arc<InspectorWaker>,
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deregister_tx: Option<oneshot::Sender<()>>,
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}
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impl Drop for JsRuntimeInspector {
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fn drop(&mut self) {
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// Since the waker is cloneable, it might outlive the inspector itself.
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// Set the poll state to 'dropped' so it doesn't attempt to request an
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// interrupt from the isolate.
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self.waker.update(|w| w.poll_state = PollState::Dropped);
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// V8 automatically deletes all sessions when an `V8Inspector` instance is
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// deleted, however InspectorSession also has a drop handler that cleans
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// up after itself. To avoid a double free, make sure the inspector is
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// dropped last.
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self.sessions.borrow_mut().drop_sessions();
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// Notify counterparty that this instance is being destroyed. Ignoring
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// result because counterparty waiting for the signal might have already
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// dropped the other end of channel.
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if let Some(deregister_tx) = self.deregister_tx.take() {
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let _ = deregister_tx.send(());
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}
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}
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}
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impl v8::inspector::V8InspectorClientImpl for JsRuntimeInspector {
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fn base(&self) -> &v8::inspector::V8InspectorClientBase {
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&self.v8_inspector_client
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}
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fn base_mut(&mut self) -> &mut v8::inspector::V8InspectorClientBase {
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&mut self.v8_inspector_client
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}
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fn run_message_loop_on_pause(&mut self, context_group_id: i32) {
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assert_eq!(context_group_id, JsRuntimeInspector::CONTEXT_GROUP_ID);
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self.flags.borrow_mut().on_pause = true;
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let _ = self.poll_sessions(None);
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}
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fn quit_message_loop_on_pause(&mut self) {
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self.flags.borrow_mut().on_pause = false;
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}
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fn run_if_waiting_for_debugger(&mut self, context_group_id: i32) {
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assert_eq!(context_group_id, JsRuntimeInspector::CONTEXT_GROUP_ID);
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self.flags.borrow_mut().waiting_for_session = false;
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}
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}
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/// Polling `JsRuntimeInspector` allows inspector to accept new incoming
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/// connections and "pump" messages in different sessions.
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///
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/// It should be polled on tick of event loop, ie. in `JsRuntime::poll_event_loop`
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/// function.
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impl Future for JsRuntimeInspector {
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type Output = ();
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fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<()> {
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self.poll_sessions(Some(cx)).unwrap()
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}
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}
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impl JsRuntimeInspector {
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/// Currently Deno supports only a single context in `JsRuntime`
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/// and thus it's id is provided as an associated contant.
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const CONTEXT_GROUP_ID: i32 = 1;
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pub fn new(
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isolate: &mut v8::OwnedIsolate,
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context: v8::Global<v8::Context>,
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) -> Box<Self> {
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let scope = &mut v8::HandleScope::new(isolate);
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let (new_session_tx, new_session_rx) =
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mpsc::unbounded::<InspectorSessionProxy>();
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let v8_inspector_client =
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v8::inspector::V8InspectorClientBase::new::<Self>();
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let waker = InspectorWaker::new(scope.thread_safe_handle());
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// Create JsRuntimeInspector instance.
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let mut self_ = Box::new(Self {
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v8_inspector_client,
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v8_inspector: Default::default(),
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sessions: RefCell::new(SessionContainer::temporary_placeholder()),
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new_session_tx,
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flags: Default::default(),
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waker,
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deregister_tx: None,
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});
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self_.v8_inspector = Rc::new(RefCell::new(
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v8::inspector::V8Inspector::create(scope, &mut *self_).into(),
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));
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self_.sessions = RefCell::new(SessionContainer::new(
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self_.v8_inspector.clone(),
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new_session_rx,
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));
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// Tell the inspector about the global context.
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let context = v8::Local::new(scope, context);
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let context_name = v8::inspector::StringView::from(&b"global context"[..]);
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self_
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.v8_inspector
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.borrow_mut()
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.as_mut()
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.unwrap()
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.context_created(context, Self::CONTEXT_GROUP_ID, context_name);
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// Poll the session handler so we will get notified whenever there is
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// new incoming debugger activity.
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let _ = self_.poll_sessions(None).unwrap();
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self_
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}
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pub fn has_active_sessions(&self) -> bool {
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self.sessions.borrow().has_active_sessions()
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}
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fn poll_sessions(
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&self,
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mut invoker_cx: Option<&mut Context>,
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) -> Result<Poll<()>, BorrowMutError> {
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// The futures this function uses do not have re-entrant poll() functions.
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// However it is can happpen that poll_sessions() gets re-entered, e.g.
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// when an interrupt request is honored while the inspector future is polled
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// by the task executor. We let the caller know by returning some error.
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let mut sessions = self.sessions.try_borrow_mut()?;
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self.waker.update(|w| {
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match w.poll_state {
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PollState::Idle | PollState::Woken => w.poll_state = PollState::Polling,
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_ => unreachable!(),
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};
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});
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// Create a new Context object that will make downstream futures
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// use the InspectorWaker when they are ready to be polled again.
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let waker_ref = task::waker_ref(&self.waker);
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let cx = &mut Context::from_waker(&waker_ref);
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loop {
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loop {
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// Do one "handshake" with a newly connected session at a time.
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if let Some(mut session) = sessions.handshake.take() {
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let poll_result = session.poll_next_unpin(cx);
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match poll_result {
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Poll::Pending => {
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sessions.established.push(session);
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continue;
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}
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Poll::Ready(Some(session_stream_item)) => {
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let (v8_session_ptr, msg) = session_stream_item;
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InspectorSession::dispatch_message(v8_session_ptr, msg);
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sessions.established.push(session);
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continue;
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}
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Poll::Ready(None) => {}
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}
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}
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// Accept new connections.
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let poll_result = sessions.session_rx.poll_next_unpin(cx);
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if let Poll::Ready(Some(session_proxy)) = poll_result {
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let session =
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InspectorSession::new(sessions.v8_inspector.clone(), session_proxy);
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let prev = sessions.handshake.replace(session);
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assert!(prev.is_none());
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}
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// Poll established sessions.
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match sessions.established.poll_next_unpin(cx) {
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Poll::Ready(Some(session_stream_item)) => {
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let (v8_session_ptr, msg) = session_stream_item;
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InspectorSession::dispatch_message(v8_session_ptr, msg);
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continue;
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}
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Poll::Ready(None) => break,
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Poll::Pending => break,
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};
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}
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let should_block =
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self.flags.borrow().on_pause || self.flags.borrow().waiting_for_session;
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let new_state = self.waker.update(|w| {
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match w.poll_state {
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PollState::Woken => {
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// The inspector was woken while the session handler was being
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// polled, so we poll it another time.
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w.poll_state = PollState::Polling;
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}
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PollState::Polling if !should_block => {
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// The session handler doesn't need to be polled any longer, and
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// there's no reason to block (execution is not paused), so this
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// function is about to return.
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w.poll_state = PollState::Idle;
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// Register the task waker that can be used to wake the parent
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// task that will poll the inspector future.
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if let Some(cx) = invoker_cx.take() {
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w.task_waker.replace(cx.waker().clone());
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}
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// Register the address of the inspector, which allows the waker
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// to request an interrupt from the isolate.
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w.inspector_ptr = NonNull::new(self as *const _ as *mut Self);
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}
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PollState::Polling if should_block => {
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// Isolate execution has been paused but there are no more
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// events to process, so this thread will be parked. Therefore,
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// store the current thread handle in the waker so it knows
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// which thread to unpark when new events arrive.
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w.poll_state = PollState::Parked;
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w.parked_thread.replace(thread::current());
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}
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_ => unreachable!(),
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};
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w.poll_state
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});
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match new_state {
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PollState::Idle => break Ok(Poll::Pending), // Yield to task.
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PollState::Polling => {} // Poll the session handler again.
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PollState::Parked => thread::park(), // Park the thread.
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_ => unreachable!(),
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};
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}
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}
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/// This function blocks the thread until at least one inspector client has
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/// established a websocket connection.
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///
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/// After that, it instructs V8 to pause at the next statement.
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/// Frontend must send "Runtime.runIfWaitingForDebugger" message to resume
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/// execution.
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pub fn wait_for_session_and_break_on_next_statement(&mut self) {
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loop {
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match self.sessions.get_mut().established.iter_mut().next() {
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Some(session) => break session.break_on_next_statement(),
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None => {
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self.flags.get_mut().waiting_for_session = true;
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let _ = self.poll_sessions(None).unwrap();
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}
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};
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}
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}
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/// Obtain a sender for proxy channels.
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pub fn get_session_sender(&self) -> UnboundedSender<InspectorSessionProxy> {
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self.new_session_tx.clone()
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}
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/// Create a channel that notifies the frontend when inspector is dropped.
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///
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/// NOTE: Only a single handler is currently available.
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pub fn add_deregister_handler(&mut self) -> oneshot::Receiver<()> {
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let (tx, rx) = oneshot::channel::<()>();
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let prev = self.deregister_tx.replace(tx);
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assert!(
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prev.is_none(),
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"Only a single deregister handler is allowed"
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);
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rx
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}
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/// Create a local inspector session that can be used on
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/// the same thread as the isolate.
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pub fn create_local_session(&self) -> LocalInspectorSession {
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// The 'outbound' channel carries messages sent to the session.
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let (outbound_tx, outbound_rx) = mpsc::unbounded();
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// The 'inbound' channel carries messages received from the session.
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let (inbound_tx, inbound_rx) = mpsc::unbounded();
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let proxy = InspectorSessionProxy {
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tx: outbound_tx,
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rx: inbound_rx,
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};
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// InspectorSessions for a local session is added directly to the "established"
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// sessions, so it doesn't need to go through the session sender.
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let inspector_session =
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InspectorSession::new(self.v8_inspector.clone(), proxy);
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self
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.sessions
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.borrow_mut()
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.established
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.push(inspector_session);
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take(&mut self.flags.borrow_mut().waiting_for_session);
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LocalInspectorSession::new(inbound_tx, outbound_rx)
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}
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}
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#[derive(Default)]
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struct InspectorFlags {
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waiting_for_session: bool,
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on_pause: bool,
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}
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/// A helper structure that helps coordinate sessions during different
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/// parts of their lifecycle.
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struct SessionContainer {
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v8_inspector: Rc<RefCell<v8::UniquePtr<v8::inspector::V8Inspector>>>,
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session_rx: UnboundedReceiver<InspectorSessionProxy>,
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handshake: Option<Box<InspectorSession>>,
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established: SelectAll<Box<InspectorSession>>,
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}
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impl SessionContainer {
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fn new(
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v8_inspector: Rc<RefCell<v8::UniquePtr<v8::inspector::V8Inspector>>>,
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new_session_rx: UnboundedReceiver<InspectorSessionProxy>,
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) -> Self {
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Self {
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v8_inspector,
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session_rx: new_session_rx,
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handshake: None,
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established: SelectAll::new(),
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}
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}
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/// V8 automatically deletes all sessions when an `V8Inspector` instance is
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/// deleted, however InspectorSession also has a drop handler that cleans
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/// up after itself. To avoid a double free, we need to manually drop
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/// all sessions before dropping the inspector instance.
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fn drop_sessions(&mut self) {
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self.v8_inspector = Default::default();
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self.handshake.take();
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self.established.clear();
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}
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fn has_active_sessions(&self) -> bool {
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!self.established.is_empty() || self.handshake.is_some()
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}
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/// A temporary placeholder that should be used before actual
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/// instance of V8Inspector is created. It's used in favor
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/// of `Default` implementation to signal that it's not meant
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/// for actual use.
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fn temporary_placeholder() -> Self {
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let (_tx, rx) = mpsc::unbounded::<InspectorSessionProxy>();
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Self {
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v8_inspector: Default::default(),
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session_rx: rx,
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handshake: None,
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established: SelectAll::new(),
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}
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}
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}
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struct InspectorWakerInner {
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poll_state: PollState,
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task_waker: Option<task::Waker>,
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parked_thread: Option<thread::Thread>,
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inspector_ptr: Option<NonNull<JsRuntimeInspector>>,
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isolate_handle: v8::IsolateHandle,
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}
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unsafe impl Send for InspectorWakerInner {}
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struct InspectorWaker(Mutex<InspectorWakerInner>);
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impl InspectorWaker {
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fn new(isolate_handle: v8::IsolateHandle) -> Arc<Self> {
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let inner = InspectorWakerInner {
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poll_state: PollState::Idle,
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task_waker: None,
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parked_thread: None,
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inspector_ptr: None,
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isolate_handle,
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};
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Arc::new(Self(Mutex::new(inner)))
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}
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fn update<F, R>(&self, update_fn: F) -> R
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where
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F: FnOnce(&mut InspectorWakerInner) -> R,
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{
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let mut g = self.0.lock();
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update_fn(&mut g)
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}
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}
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impl task::ArcWake for InspectorWaker {
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fn wake_by_ref(arc_self: &Arc<Self>) {
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arc_self.update(|w| {
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match w.poll_state {
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PollState::Idle => {
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// Wake the task, if any, that has polled the Inspector future last.
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if let Some(waker) = w.task_waker.take() {
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waker.wake()
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}
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// Request an interrupt from the isolate if it's running and there's
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// not unhandled interrupt request in flight.
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if let Some(arg) = w
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.inspector_ptr
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.take()
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.map(|ptr| ptr.as_ptr() as *mut c_void)
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{
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w.isolate_handle.request_interrupt(handle_interrupt, arg);
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}
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extern "C" fn handle_interrupt(
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_isolate: &mut v8::Isolate,
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arg: *mut c_void,
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) {
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let inspector = unsafe { &*(arg as *mut JsRuntimeInspector) };
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let _ = inspector.poll_sessions(None);
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}
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}
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PollState::Parked => {
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// Unpark the isolate thread.
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let parked_thread = w.parked_thread.take().unwrap();
|
|
assert_ne!(parked_thread.id(), thread::current().id());
|
|
parked_thread.unpark();
|
|
}
|
|
_ => {}
|
|
};
|
|
w.poll_state = PollState::Woken;
|
|
});
|
|
}
|
|
}
|
|
|
|
/// An inspector session that proxies messages to concrete "transport layer",
|
|
/// eg. Websocket or another set of channels.
|
|
struct InspectorSession {
|
|
v8_channel: v8::inspector::ChannelBase,
|
|
v8_session: v8::UniqueRef<v8::inspector::V8InspectorSession>,
|
|
proxy: InspectorSessionProxy,
|
|
}
|
|
|
|
impl InspectorSession {
|
|
const CONTEXT_GROUP_ID: i32 = 1;
|
|
|
|
pub fn new(
|
|
v8_inspector_rc: Rc<RefCell<v8::UniquePtr<v8::inspector::V8Inspector>>>,
|
|
session_proxy: InspectorSessionProxy,
|
|
) -> Box<Self> {
|
|
new_box_with(move |self_ptr| {
|
|
let v8_channel = v8::inspector::ChannelBase::new::<Self>();
|
|
let mut v8_inspector = v8_inspector_rc.borrow_mut();
|
|
let v8_inspector_ptr = v8_inspector.as_mut().unwrap();
|
|
let v8_session = v8_inspector_ptr.connect(
|
|
Self::CONTEXT_GROUP_ID,
|
|
// Todo(piscisaureus): V8Inspector::connect() should require that
|
|
// the 'v8_channel' argument cannot move.
|
|
unsafe { &mut *self_ptr },
|
|
v8::inspector::StringView::empty(),
|
|
);
|
|
|
|
Self {
|
|
v8_channel,
|
|
v8_session,
|
|
proxy: session_proxy,
|
|
}
|
|
})
|
|
}
|
|
|
|
// Dispatch message to V8 session
|
|
fn dispatch_message(
|
|
v8_session_ptr: *mut v8::inspector::V8InspectorSession,
|
|
msg: String,
|
|
) {
|
|
let msg = v8::inspector::StringView::from(msg.as_bytes());
|
|
unsafe {
|
|
(*v8_session_ptr).dispatch_protocol_message(msg);
|
|
};
|
|
}
|
|
|
|
fn send_message(
|
|
&self,
|
|
msg_kind: InspectorMsgKind,
|
|
msg: v8::UniquePtr<v8::inspector::StringBuffer>,
|
|
) {
|
|
let msg = msg.unwrap().string().to_string();
|
|
let _ = self.proxy.tx.unbounded_send(InspectorMsg {
|
|
kind: msg_kind,
|
|
content: msg,
|
|
});
|
|
}
|
|
|
|
pub fn break_on_next_statement(&mut self) {
|
|
let reason = v8::inspector::StringView::from(&b"debugCommand"[..]);
|
|
let detail = v8::inspector::StringView::empty();
|
|
// TODO(bartlomieju): use raw `*mut V8InspectorSession` pointer, as this
|
|
// reference may become aliased.
|
|
(*self.v8_session).schedule_pause_on_next_statement(reason, detail);
|
|
}
|
|
}
|
|
|
|
impl v8::inspector::ChannelImpl for InspectorSession {
|
|
fn base(&self) -> &v8::inspector::ChannelBase {
|
|
&self.v8_channel
|
|
}
|
|
|
|
fn base_mut(&mut self) -> &mut v8::inspector::ChannelBase {
|
|
&mut self.v8_channel
|
|
}
|
|
|
|
fn send_response(
|
|
&mut self,
|
|
call_id: i32,
|
|
message: v8::UniquePtr<v8::inspector::StringBuffer>,
|
|
) {
|
|
self.send_message(InspectorMsgKind::Message(call_id), message);
|
|
}
|
|
|
|
fn send_notification(
|
|
&mut self,
|
|
message: v8::UniquePtr<v8::inspector::StringBuffer>,
|
|
) {
|
|
self.send_message(InspectorMsgKind::Notification, message);
|
|
}
|
|
|
|
fn flush_protocol_notifications(&mut self) {}
|
|
}
|
|
|
|
impl Stream for InspectorSession {
|
|
type Item = (*mut v8::inspector::V8InspectorSession, String);
|
|
|
|
fn poll_next(
|
|
self: Pin<&mut Self>,
|
|
cx: &mut Context,
|
|
) -> Poll<Option<Self::Item>> {
|
|
let inner = self.get_mut();
|
|
if let Poll::Ready(maybe_msg) = inner.proxy.rx.poll_next_unpin(cx) {
|
|
if let Some(msg) = maybe_msg {
|
|
return Poll::Ready(Some((&mut *inner.v8_session, msg)));
|
|
} else {
|
|
return Poll::Ready(None);
|
|
}
|
|
}
|
|
|
|
Poll::Pending
|
|
}
|
|
}
|
|
|
|
/// A local inspector session that can be used to send and receive protocol messages directly on
|
|
/// the same thread as an isolate.
|
|
pub struct LocalInspectorSession {
|
|
v8_session_tx: UnboundedSender<String>,
|
|
v8_session_rx: UnboundedReceiver<InspectorMsg>,
|
|
response_tx_map: HashMap<i32, oneshot::Sender<serde_json::Value>>,
|
|
next_message_id: i32,
|
|
notification_queue: Vec<Value>,
|
|
}
|
|
|
|
impl LocalInspectorSession {
|
|
pub fn new(
|
|
v8_session_tx: UnboundedSender<String>,
|
|
v8_session_rx: UnboundedReceiver<InspectorMsg>,
|
|
) -> Self {
|
|
let response_tx_map = HashMap::new();
|
|
let next_message_id = 0;
|
|
|
|
let notification_queue = Vec::new();
|
|
|
|
Self {
|
|
v8_session_tx,
|
|
v8_session_rx,
|
|
response_tx_map,
|
|
next_message_id,
|
|
notification_queue,
|
|
}
|
|
}
|
|
|
|
pub fn notifications(&mut self) -> Vec<Value> {
|
|
self.notification_queue.split_off(0)
|
|
}
|
|
|
|
pub async fn post_message(
|
|
&mut self,
|
|
method: &str,
|
|
params: Option<serde_json::Value>,
|
|
) -> Result<serde_json::Value, Error> {
|
|
let id = self.next_message_id;
|
|
self.next_message_id += 1;
|
|
|
|
let (response_tx, mut response_rx) =
|
|
oneshot::channel::<serde_json::Value>();
|
|
self.response_tx_map.insert(id, response_tx);
|
|
|
|
let message = json!({
|
|
"id": id,
|
|
"method": method,
|
|
"params": params,
|
|
});
|
|
|
|
let stringified_msg = serde_json::to_string(&message).unwrap();
|
|
self.v8_session_tx.unbounded_send(stringified_msg).unwrap();
|
|
|
|
loop {
|
|
let receive_fut = self.receive_from_v8_session().boxed_local();
|
|
match select(receive_fut, &mut response_rx).await {
|
|
Either::Left(_) => continue,
|
|
Either::Right((result, _)) => {
|
|
let response = result?;
|
|
if let Some(error) = response.get("error") {
|
|
return Err(generic_error(error.to_string()));
|
|
}
|
|
|
|
let result = response.get("result").unwrap().clone();
|
|
return Ok(result);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
async fn receive_from_v8_session(&mut self) {
|
|
let inspector_msg = self.v8_session_rx.next().await.unwrap();
|
|
if let InspectorMsgKind::Message(msg_id) = inspector_msg.kind {
|
|
let message: serde_json::Value =
|
|
match serde_json::from_str(&inspector_msg.content) {
|
|
Ok(v) => v,
|
|
Err(error) => match error.classify() {
|
|
serde_json::error::Category::Syntax => json!({
|
|
"id": msg_id,
|
|
"result": {
|
|
"result": {
|
|
"type": "error",
|
|
"description": "Unterminated string literal",
|
|
"value": "Unterminated string literal",
|
|
},
|
|
"exceptionDetails": {
|
|
"exceptionId": 0,
|
|
"text": "Unterminated string literal",
|
|
"lineNumber": 0,
|
|
"columnNumber": 0
|
|
},
|
|
},
|
|
}),
|
|
_ => panic!("Could not parse inspector message"),
|
|
},
|
|
};
|
|
|
|
self
|
|
.response_tx_map
|
|
.remove(&msg_id)
|
|
.unwrap()
|
|
.send(message)
|
|
.unwrap();
|
|
} else {
|
|
let message = serde_json::from_str(&inspector_msg.content).unwrap();
|
|
self.notification_queue.push(message);
|
|
}
|
|
}
|
|
}
|
|
|
|
fn new_box_with<T>(new_fn: impl FnOnce(*mut T) -> T) -> Box<T> {
|
|
let b = Box::new(MaybeUninit::<T>::uninit());
|
|
let p = Box::into_raw(b) as *mut T;
|
|
unsafe { ptr::write(p, new_fn(p)) };
|
|
unsafe { Box::from_raw(p) }
|
|
}
|