public:

virtual ~InspectorSession() = default;

virtual void Dispatch(const v8_inspector::StringView& message) = 0;

public:

virtual ~InspectorSessionDelegate() = default;

virtual void SendMessageToFrontend(const v8_inspector::StringView& message)

= 0;

public:

explicit Agent(node::Environment* env);

~Agent();

// Create client_, may create io_ if option enabled

bool Start(const std::string& path,

const DebugOptions& options,

std::shared_ptr<ExclusiveAccess<HostPort>> host_port,

bool is_main);

// Stop and destroy io_

void Stop();

bool IsListening() { return io_ != nullptr; }

// Returns true if the Node inspector is actually in use. It will be true

// if either the user explicitly opted into inspector (e.g. with the

// --inspect command line flag) or if inspector JS API had been used.

bool IsActive();

// Option is set to wait for session connection

bool WillWaitForConnect();

// Blocks till frontend connects and sends "runIfWaitingForDebugger"

void WaitForConnect();

// Blocks till all the sessions with "WaitForDisconnectOnShutdown" disconnect

void WaitForDisconnect();

void ReportUncaughtException(v8::Local<v8::Value> error,

v8::Local<v8::Message> message);

// Async stack traces instrumentation.

void AsyncTaskScheduled(const v8_inspector::StringView& taskName, void* task,

bool recurring);

void AsyncTaskCanceled(void* task);

void AsyncTaskStarted(void* task);

void AsyncTaskFinished(void* task);

void AllAsyncTasksCanceled();

void RegisterAsyncHook(v8::Isolate* isolate,

v8::Local<v8::Function> enable_function,

v8::Local<v8::Function> disable_function);

void EnableAsyncHook();

void DisableAsyncHook();

void SetParentHandle(std::unique_ptr<ParentInspectorHandle> parent_handle);

std::unique_ptr<ParentInspectorHandle> GetParentHandle(

int thread_id, const std::string& url);

// Called to create inspector sessions that can be used from the same thread.

// The inspector responds by using the delegate to send messages back.

std::unique_ptr<InspectorSession> Connect(

std::unique_ptr<InspectorSessionDelegate> delegate,

bool prevent_shutdown);

// Called from the worker to create inspector sessions that is connected

// to the main thread.

// The inspector responds by using the delegate to send messages back.

std::unique_ptr<InspectorSession> ConnectToMainThread(

std::unique_ptr<InspectorSessionDelegate> delegate,

bool prevent_shutdown);

void PauseOnNextJavascriptStatement(const std::string& reason);

std::string GetWsUrl() const;

// Can only be called from the main thread.

bool StartIoThread();

// Calls StartIoThread() from off the main thread.

void RequestIoThreadStart();

const DebugOptions& options() { return debug_options_; }

std::shared_ptr<ExclusiveAccess<HostPort>> host_port() { return host_port_; }

void ContextCreated(v8::Local<v8::Context> context, const ContextInfo& info);

// Interface for interacting with inspectors in worker threads

std::shared_ptr<WorkerManager> GetWorkerManager();

private:

void ToggleAsyncHook(v8::Isolate* isolate,

const v8::Global<v8::Function>& fn);

node::Environment* parent_env_;

// Encapsulates majority of the Inspector functionality

std::shared_ptr<NodeInspectorClient> client_;

// Interface for transports, e.g. WebSocket server

std::unique_ptr<InspectorIo> io_;

std::unique_ptr<ParentInspectorHandle> parent_handle_;

std::string path_;

// This is a copy of the debug options parsed from CLI in the Environment.

// Do not use the host_port in that, instead manipulate the shared host_port_

// pointer which is meant to store the actual host and port of the inspector

// server.

DebugOptions debug_options_;

std::shared_ptr<ExclusiveAccess<HostPort>> host_port_;

bool pending_enable_async_hook_ = false;

bool pending_disable_async_hook_ = false;

v8::Global<v8::Function> enable_async_hook_function_;

v8::Global<v8::Function> disable_async_hook_function_;