inspector: reduce implementation in header

This is needed to reduce the coupling between node files that use
node::Environment and inspector class.

Fixes: https://github.com/nodejs/node/issues/7080
PR-URL: https://github.com/nodejs/node/pull/7228
Reviewed-By: bnoordhuis - Ben Noordhuis <info@bnoordhuis.nl>

3 files changed, 159 insertions, 117 deletions

diff --git a/src/inspector_agent.cc b/src/inspector_agent.cc
index 848fcf320f..bcccff4acb 100644
--- a/src/inspector_agent.cc
+++ b/src/inspector_agent.cc
@@ -1,8 +1,9 @@
 #include "inspector_agent.h"
 
-#include "node.h"
+#include "inspector_socket.h"
 #include "env.h"
 #include "env-inl.h"
+#include "node.h"
 #include "node_version.h"
 #include "v8-platform.h"
 #include "util.h"
@@ -15,6 +16,7 @@
 #include "libplatform/libplatform.h"
 
 #include <string.h>
+#include <vector>
 
 // We need pid to use as ID with Chrome
 #if defined(_MSC_VER)
@@ -150,25 +152,89 @@ namespace inspector {
 using blink::protocol::DictionaryValue;
 using blink::protocol::String16;
 
+class AgentImpl {
+ public:
+  explicit AgentImpl(node::Environment* env);
+  ~AgentImpl();
+
+  // Start the inspector agent thread
+  void Start(v8::Platform* platform, int port, bool wait);
+  // Stop the inspector agent
+  void Stop();
+
+  bool IsStarted();
+  bool IsConnected() {  return connected_; }
+  void WaitForDisconnect();
+
+ private:
+  static void ThreadCbIO(void* agent);
+  static void OnSocketConnectionIO(uv_stream_t* server, int status);
+  static bool OnInspectorHandshakeIO(inspector_socket_t* socket,
+                                     enum inspector_handshake_event state,
+                                     const char* path);
+  static void OnRemoteDataIO(uv_stream_t* stream, ssize_t read,
+      const uv_buf_t* b);
+  static void WriteCbIO(uv_async_t* async);
+
+  void WorkerRunIO();
+  void OnInspectorConnectionIO(inspector_socket_t* socket);
+  void PushPendingMessage(std::vector<std::string>* queue,
+                          const std::string& message);
+  void SwapBehindLock(std::vector<std::string> AgentImpl::*queue,
+                      std::vector<std::string>* output);
+  void PostMessages();
+  void SetConnected(bool connected);
+  void Write(const std::string& message);
+
+  uv_sem_t start_sem_;
+  uv_cond_t pause_cond_;
+  uv_mutex_t queue_lock_;
+  uv_mutex_t pause_lock_;
+  uv_thread_t thread_;
+  uv_loop_t child_loop_;
+  uv_tcp_t server_;
+
+  int port_;
+  bool wait_;
+  bool connected_;
+  bool shutting_down_;
+  node::Environment* parent_env_;
+
+  uv_async_t data_written_;
+  uv_async_t io_thread_req_;
+  inspector_socket_t* client_socket_;
+  blink::V8Inspector* inspector_;
+  v8::Platform* platform_;
+  std::vector<std::string> message_queue_;
+  std::vector<std::string> outgoing_message_queue_;
+  bool dispatching_messages_;
+
+  friend class ChannelImpl;
+  friend class DispatchOnInspectorBackendTask;
+  friend class SetConnectedTask;
+  friend class V8NodeInspector;
+  friend void InterruptCallback(v8::Isolate*, void* agent);
+};
+
 void InterruptCallback(v8::Isolate*, void* agent) {
-  static_cast<Agent*>(agent)->PostMessages();
+  static_cast<AgentImpl*>(agent)->PostMessages();
 }
 
 class DispatchOnInspectorBackendTask : public v8::Task {
  public:
-  explicit DispatchOnInspectorBackendTask(Agent* agent) : agent_(agent) {}
+  explicit DispatchOnInspectorBackendTask(AgentImpl* agent) : agent_(agent) {}
 
   void Run() override {
     agent_->PostMessages();
   }
 
  private:
-  Agent* agent_;
+  AgentImpl* agent_;
 };
 
 class ChannelImpl final : public blink::protocol::FrontendChannel {
  public:
-  explicit ChannelImpl(Agent* agent): agent_(agent) {}
+  explicit ChannelImpl(AgentImpl* agent): agent_(agent) {}
   virtual ~ChannelImpl() {}
  private:
   virtual void sendProtocolResponse(int sessionId, int callId,
@@ -188,12 +254,12 @@ class ChannelImpl final : public blink::protocol::FrontendChannel {
     agent_->Write(message->toJSONString().utf8());
   }
 
-  Agent* const agent_;
+  AgentImpl* const agent_;
 };
 
 class SetConnectedTask : public v8::Task {
  public:
-  SetConnectedTask(Agent* agent, bool connected)
+  SetConnectedTask(AgentImpl* agent, bool connected)
      : agent_(agent),
        connected_(connected) {}
 
@@ -202,19 +268,20 @@ class SetConnectedTask : public v8::Task {
   }
 
  private:
-  Agent* agent_;
+  AgentImpl* agent_;
   bool connected_;
 };
 
 class V8NodeInspector : public blink::V8Inspector {
  public:
-  V8NodeInspector(Agent* agent, node::Environment* env, v8::Platform* platform)
-      : blink::V8Inspector(env->isolate(), env->context()),
-        agent_(agent),
-        isolate_(env->isolate()),
-        platform_(platform),
-        terminated_(false),
-        running_nested_loop_(false) {}
+  V8NodeInspector(AgentImpl* agent, node::Environment* env,
+                  v8::Platform* platform)
+                  : blink::V8Inspector(env->isolate(), env->context()),
+                    agent_(agent),
+                    isolate_(env->isolate()),
+                    platform_(platform),
+                    terminated_(false),
+                    running_nested_loop_(false) {}
 
   void runMessageLoopOnPause(int context_group_id) override {
     if (running_nested_loop_)
@@ -237,28 +304,28 @@ class V8NodeInspector : public blink::V8Inspector {
   }
 
  private:
-  Agent* agent_;
+  AgentImpl* agent_;
   v8::Isolate* isolate_;
   v8::Platform* platform_;
   bool terminated_;
   bool running_nested_loop_;
 };
 
-Agent::Agent(Environment* env) : port_(0),
-                                 wait_(false),
-                                 connected_(false),
-                                 shutting_down_(false),
-                                 parent_env_(env),
-                                 client_socket_(nullptr),
-                                 inspector_(nullptr),
-                                 platform_(nullptr),
-                                 dispatching_messages_(false) {
+AgentImpl::AgentImpl(Environment* env) : port_(0),
+                                         wait_(false),
+                                         connected_(false),
+                                         shutting_down_(false),
+                                         parent_env_(env),
+                                         client_socket_(nullptr),
+                                         inspector_(nullptr),
+                                         platform_(nullptr),
+                                         dispatching_messages_(false) {
   int err;
   err = uv_sem_init(&start_sem_, 0);
   CHECK_EQ(err, 0);
 }
 
-Agent::~Agent() {
+AgentImpl::~AgentImpl() {
   if (!inspector_)
     return;
   uv_mutex_destroy(&queue_lock_);
@@ -267,7 +334,7 @@ Agent::~Agent() {
   uv_close(reinterpret_cast<uv_handle_t*>(&data_written_), nullptr);
 }
 
-void Agent::Start(v8::Platform* platform, int port, bool wait) {
+void AgentImpl::Start(v8::Platform* platform, int port, bool wait) {
   auto env = parent_env_;
   inspector_ = new V8NodeInspector(this, env, platform);
 
@@ -291,7 +358,7 @@ void Agent::Start(v8::Platform* platform, int port, bool wait) {
   port_ = port;
   wait_ = wait;
 
-  err = uv_thread_create(&thread_, Agent::ThreadCbIO, this);
+  err = uv_thread_create(&thread_, AgentImpl::ThreadCbIO, this);
   CHECK_EQ(err, 0);
   uv_sem_wait(&start_sem_);
 
@@ -303,7 +370,7 @@ void Agent::Start(v8::Platform* platform, int port, bool wait) {
   }
 }
 
-void Agent::Stop() {
+void AgentImpl::Stop() {
   // TODO(repenaxa): hop on the right thread.
   DisconnectAndDisposeIO(client_socket_);
   int err = uv_thread_join(&thread_);
@@ -316,40 +383,41 @@ void Agent::Stop() {
   delete inspector_;
 }
 
-bool Agent::IsStarted() {
+bool AgentImpl::IsStarted() {
   return !!platform_;
 }
 
-void Agent::WaitForDisconnect() {
+void AgentImpl::WaitForDisconnect() {
   shutting_down_ = true;
   fprintf(stderr, "Waiting for the debugger to disconnect...\n");
   inspector_->runMessageLoopOnPause(0);
 }
 
 // static
-void Agent::ThreadCbIO(void* agent) {
-  static_cast<Agent*>(agent)->WorkerRunIO();
+void AgentImpl::ThreadCbIO(void* agent) {
+  static_cast<AgentImpl*>(agent)->WorkerRunIO();
 }
 
 // static
-void Agent::OnSocketConnectionIO(uv_stream_t* server, int status) {
+void AgentImpl::OnSocketConnectionIO(uv_stream_t* server, int status) {
   if (status == 0) {
     inspector_socket_t* socket =
         static_cast<inspector_socket_t*>(malloc(sizeof(*socket)));
     ASSERT_NE(nullptr, socket);
     memset(socket, 0, sizeof(*socket));
     socket->data = server->data;
-    if (inspector_accept(server, socket, Agent::OnInspectorHandshakeIO) != 0) {
+    if (inspector_accept(server, socket,
+                         AgentImpl::OnInspectorHandshakeIO) != 0) {
       free(socket);
     }
   }
 }
 
 // static
-bool Agent::OnInspectorHandshakeIO(inspector_socket_t* socket,
+bool AgentImpl::OnInspectorHandshakeIO(inspector_socket_t* socket,
                                    enum inspector_handshake_event state,
                                    const char* path) {
-  Agent* agent = static_cast<Agent*>(socket->data);
+  AgentImpl* agent = static_cast<AgentImpl*>(socket->data);
   switch (state) {
   case kInspectorHandshakeHttpGet:
     return RespondToGet(socket, path, agent->port_);
@@ -366,11 +434,11 @@ bool Agent::OnInspectorHandshakeIO(inspector_socket_t* socket,
 }
 
 // static
-void Agent::OnRemoteDataIO(uv_stream_t* stream,
+void AgentImpl::OnRemoteDataIO(uv_stream_t* stream,
                            ssize_t read,
                            const uv_buf_t* b) {
   inspector_socket_t* socket = static_cast<inspector_socket_t*>(stream->data);
-  Agent* agent = static_cast<Agent*>(socket->data);
+  AgentImpl* agent = static_cast<AgentImpl*>(socket->data);
   if (read > 0) {
     std::string str(b->base, read);
     agent->PushPendingMessage(&agent->message_queue_, str);
@@ -407,14 +475,14 @@ void Agent::OnRemoteDataIO(uv_stream_t* stream,
   uv_cond_broadcast(&agent->pause_cond_);
 }
 
-void Agent::PushPendingMessage(std::vector<std::string>* queue,
+void AgentImpl::PushPendingMessage(std::vector<std::string>* queue,
                                const std::string& message) {
   uv_mutex_lock(&queue_lock_);
   queue->push_back(message);
   uv_mutex_unlock(&queue_lock_);
 }
 
-void Agent::SwapBehindLock(std::vector<std::string> Agent::*queue,
+void AgentImpl::SwapBehindLock(std::vector<std::string> AgentImpl::*queue,
                            std::vector<std::string>* output) {
   uv_mutex_lock(&queue_lock_);
   (this->*queue).swap(*output);
@@ -422,21 +490,22 @@ void Agent::SwapBehindLock(std::vector<std::string> Agent::*queue,
 }
 
 // static
-void Agent::WriteCbIO(uv_async_t* async) {
-  Agent* agent = static_cast<Agent*>(async->data);
+void AgentImpl::WriteCbIO(uv_async_t* async) {
+  AgentImpl* agent = static_cast<AgentImpl*>(async->data);
   inspector_socket_t* socket = agent->client_socket_;
   if (socket) {
     std::vector<std::string> outgoing_messages;
-    agent->SwapBehindLock(&Agent::outgoing_message_queue_, &outgoing_messages);
+    agent->SwapBehindLock(&AgentImpl::outgoing_message_queue_,
+                          &outgoing_messages);
     for (auto const& message : outgoing_messages)
       inspector_write(socket, message.c_str(), message.length());
   }
 }
 
-void Agent::WorkerRunIO() {
+void AgentImpl::WorkerRunIO() {
   sockaddr_in addr;
   uv_tcp_t server;
-  int err = uv_async_init(&child_loop_, &io_thread_req_, Agent::WriteCbIO);
+  int err = uv_async_init(&child_loop_, &io_thread_req_, AgentImpl::WriteCbIO);
   CHECK_EQ(0, err);
   io_thread_req_.data = this;
   uv_tcp_init(&child_loop_, &server);
@@ -463,22 +532,22 @@ void Agent::WorkerRunIO() {
   uv_run(&child_loop_, UV_RUN_DEFAULT);
 }
 
-void Agent::OnInspectorConnectionIO(inspector_socket_t* socket) {
+void AgentImpl::OnInspectorConnectionIO(inspector_socket_t* socket) {
   if (client_socket_) {
     return;
   }
   client_socket_ = socket;
-  inspector_read_start(socket, OnBufferAlloc, Agent::OnRemoteDataIO);
+  inspector_read_start(socket, OnBufferAlloc, AgentImpl::OnRemoteDataIO);
   platform_->CallOnForegroundThread(parent_env_->isolate(),
       new SetConnectedTask(this, true));
 }
 
-void Agent::PostMessages() {
+void AgentImpl::PostMessages() {
   if (dispatching_messages_)
     return;
   dispatching_messages_ = true;
   std::vector<std::string> messages;
-  SwapBehindLock(&Agent::message_queue_, &messages);
+  SwapBehindLock(&AgentImpl::message_queue_, &messages);
   for (auto const& message : messages)
     inspector_->dispatchMessageFromFrontend(
         String16::fromUTF8(message.c_str(), message.length()));
@@ -486,7 +555,7 @@ void Agent::PostMessages() {
   dispatching_messages_ = false;
 }
 
-void Agent::SetConnected(bool connected) {
+void AgentImpl::SetConnected(bool connected) {
   if (connected_ == connected)
     return;
 
@@ -502,9 +571,37 @@ void Agent::SetConnected(bool connected) {
   }
 }
 
-void Agent::Write(const std::string& message) {
+void AgentImpl::Write(const std::string& message) {
   PushPendingMessage(&outgoing_message_queue_, message);
   ASSERT_EQ(0, uv_async_send(&io_thread_req_));
 }
-}  // namespace debugger
+
+// Exported class Agent
+Agent::Agent(node::Environment* env) : impl(new AgentImpl(env)) {}
+
+Agent::~Agent() {
+  delete impl;
+}
+
+void Agent::Start(v8::Platform* platform, int port, bool wait) {
+  impl->Start(platform, port, wait);
+};
+
+void Agent::Stop() {
+  impl->Stop();
+};
+
+bool Agent::IsStarted() {
+  return impl->IsStarted();
+};
+
+bool Agent::IsConnected() {
+  return impl->IsConnected();
+};
+
+void Agent::WaitForDisconnect() {
+  impl->WaitForDisconnect();
+};
+
+}  // namespace inspector
 }  // namespace node
diff --git a/src/inspector_agent.h b/src/inspector_agent.h
index 65a4abeff7..863f1c30c3 100644
--- a/src/inspector_agent.h
+++ b/src/inspector_agent.h
@@ -5,27 +5,19 @@
 #error("This header can only be used when inspector is enabled")
 #endif
 
-#include "inspector_socket.h"
-#include "uv.h"
-#include "v8.h"
-#include "util.h"
-
-#include <string>
-#include <vector>
-
-namespace blink {
-class V8Inspector;
-}
-
 // Forward declaration to break recursive dependency chain with src/env.h.
 namespace node {
 class Environment;
 }  // namespace node
 
+namespace v8 {
+class Platform;
+}  // namespace v8
+
 namespace node {
 namespace inspector {
 
-class ChannelImpl;
+class AgentImpl;
 
 class Agent {
  public:
@@ -38,57 +30,10 @@ class Agent {
   void Stop();
 
   bool IsStarted();
-  bool connected() {  return connected_; }
+  bool IsConnected();
   void WaitForDisconnect();
-
- protected:
-  static void ThreadCbIO(void* agent);
-  static void OnSocketConnectionIO(uv_stream_t* server, int status);
-  static bool OnInspectorHandshakeIO(inspector_socket_t* socket,
-                                     enum inspector_handshake_event state,
-                                     const char* path);
-  static void OnRemoteDataIO(uv_stream_t* stream, ssize_t read,
-      const uv_buf_t* b);
-  static void WriteCbIO(uv_async_t* async);
-
-  void WorkerRunIO();
-  void OnInspectorConnectionIO(inspector_socket_t* socket);
-  void PushPendingMessage(std::vector<std::string>* queue,
-                          const std::string& message);
-  void SwapBehindLock(std::vector<std::string> Agent::*queue,
-                      std::vector<std::string>* output);
-  void PostMessages();
-  void SetConnected(bool connected);
-  void Write(const std::string& message);
-
-  uv_sem_t start_sem_;
-  uv_cond_t pause_cond_;
-  uv_mutex_t queue_lock_;
-  uv_mutex_t pause_lock_;
-  uv_thread_t thread_;
-  uv_loop_t child_loop_;
-  uv_tcp_t server_;
-
-  int port_;
-  bool wait_;
-  bool connected_;
-  bool shutting_down_;
-  node::Environment* parent_env_;
-
-  uv_async_t data_written_;
-  uv_async_t io_thread_req_;
-  inspector_socket_t* client_socket_;
-  blink::V8Inspector* inspector_;
-  v8::Platform* platform_;
-  std::vector<std::string> message_queue_;
-  std::vector<std::string> outgoing_message_queue_;
-  bool dispatching_messages_;
-
-  friend class ChannelImpl;
-  friend class DispatchOnInspectorBackendTask;
-  friend class SetConnectedTask;
-  friend class V8NodeInspector;
-  friend void InterruptCallback(v8::Isolate*, void* agent);
+ private:
+  AgentImpl* impl;
 };
 
 }  // namespace inspector
diff --git a/src/node.cc b/src/node.cc
index a14d9c8823..0e042137ef 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -4298,7 +4298,7 @@ static void StartNodeInstance(void* arg) {
     RunAtExit(&env);
 
 #if HAVE_INSPECTOR
-    if (env.inspector_agent()->connected()) {
+    if (env.inspector_agent()->IsConnected()) {
       // Restore signal dispositions, the app is done and is no longer
       // capable of handling signals.
 #ifdef __POSIX__