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// Copyright Fedor Indutny and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
#include "debug-agent.h"
#include "node.h"
#include "node_internals.h" // arraysize
#include "env.h"
#include "env-inl.h"
#include "v8.h"
#include "v8-debug.h"
#include "util.h"
#include "util-inl.h"
#include <string.h>
namespace node {
namespace debugger {
using v8::Context;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Integer;
using v8::Isolate;
using v8::Local;
using v8::Locker;
using v8::NewStringType;
using v8::Object;
using v8::String;
using v8::Value;
Agent::Agent(Environment* env) : state_(kNone),
port_(5858),
wait_(false),
parent_env_(env),
child_env_(nullptr),
dispatch_handler_(nullptr) {
CHECK_EQ(0, uv_sem_init(&start_sem_, 0));
}
Agent::~Agent() {
Stop();
uv_sem_destroy(&start_sem_);
while (AgentMessage* msg = messages_.PopFront())
delete msg;
}
bool Agent::Start(const char* host, int port, bool wait) {
int err;
if (state_ == kRunning)
return false;
err = uv_loop_init(&child_loop_);
if (err != 0)
goto loop_init_failed;
// Interruption signal handler
err = uv_async_init(&child_loop_, &child_signal_, ChildSignalCb);
if (err != 0)
goto async_init_failed;
uv_unref(reinterpret_cast<uv_handle_t*>(&child_signal_));
host_ = host;
port_ = port;
wait_ = wait;
err = uv_thread_create(&thread_,
reinterpret_cast<uv_thread_cb>(ThreadCb),
this);
if (err != 0)
goto thread_create_failed;
uv_sem_wait(&start_sem_);
state_ = kRunning;
return true;
thread_create_failed:
uv_close(reinterpret_cast<uv_handle_t*>(&child_signal_), nullptr);
async_init_failed:
err = uv_loop_close(&child_loop_);
CHECK_EQ(err, 0);
loop_init_failed:
return false;
}
void Agent::Enable() {
v8::Debug::SetMessageHandler(parent_env()->isolate(), MessageHandler);
// Assign environment to the debugger's context
// NOTE: The debugger context is created after `SetMessageHandler()` call
auto debug_context = v8::Debug::GetDebugContext(parent_env()->isolate());
parent_env()->AssignToContext(debug_context);
}
void Agent::Stop() {
int err;
if (state_ != kRunning) {
return;
}
v8::Debug::SetMessageHandler(parent_env()->isolate(), nullptr);
// Send empty message to terminate things
EnqueueMessage(new AgentMessage(nullptr, 0));
// Signal worker thread to make it stop
err = uv_async_send(&child_signal_);
CHECK_EQ(err, 0);
err = uv_thread_join(&thread_);
CHECK_EQ(err, 0);
uv_close(reinterpret_cast<uv_handle_t*>(&child_signal_), nullptr);
uv_run(&child_loop_, UV_RUN_NOWAIT);
err = uv_loop_close(&child_loop_);
CHECK_EQ(err, 0);
state_ = kNone;
}
void Agent::WorkerRun() {
static const char* argv[] = { "node", "--debug-agent" };
Isolate::CreateParams params;
ArrayBufferAllocator array_buffer_allocator;
params.array_buffer_allocator = &array_buffer_allocator;
Isolate* isolate = Isolate::New(params);
{
Locker locker(isolate);
Isolate::Scope isolate_scope(isolate);
HandleScope handle_scope(isolate);
IsolateData isolate_data(isolate, &child_loop_,
array_buffer_allocator.zero_fill_field());
Local<Context> context = Context::New(isolate);
Context::Scope context_scope(context);
Environment env(&isolate_data, context);
const bool start_profiler_idle_notifier = false;
env.Start(arraysize(argv), argv,
arraysize(argv), argv,
start_profiler_idle_notifier);
child_env_ = &env;
// Expose API
InitAdaptor(&env);
LoadEnvironment(&env);
CHECK_EQ(&child_loop_, env.event_loop());
uv_run(&child_loop_, UV_RUN_DEFAULT);
// Clean-up peristent
api_.Reset();
}
isolate->Dispose();
}
void Agent::InitAdaptor(Environment* env) {
Isolate* isolate = env->isolate();
HandleScope scope(isolate);
// Create API adaptor
Local<FunctionTemplate> t = FunctionTemplate::New(isolate);
t->InstanceTemplate()->SetInternalFieldCount(1);
t->SetClassName(String::NewFromUtf8(isolate, "DebugAPI"));
NODE_SET_PROTOTYPE_METHOD(t, "notifyListen", NotifyListen);
NODE_SET_PROTOTYPE_METHOD(t, "notifyWait", NotifyWait);
NODE_SET_PROTOTYPE_METHOD(t, "sendCommand", SendCommand);
Local<Object> api =
t->GetFunction()->NewInstance(env->context()).ToLocalChecked();
api->SetAlignedPointerInInternalField(0, this);
api->Set(String::NewFromUtf8(isolate, "host",
NewStringType::kNormal).ToLocalChecked(),
String::NewFromUtf8(isolate, host_.data(), NewStringType::kNormal,
host_.size()).ToLocalChecked());
api->Set(String::NewFromUtf8(isolate, "port"), Integer::New(isolate, port_));
env->process_object()->Set(String::NewFromUtf8(isolate, "_debugAPI"), api);
api_.Reset(env->isolate(), api);
}
Agent* Agent::Unwrap(const v8::FunctionCallbackInfo<v8::Value>& args) {
void* ptr = args.Holder()->GetAlignedPointerFromInternalField(0);
return reinterpret_cast<Agent*>(ptr);
}
void Agent::NotifyListen(const FunctionCallbackInfo<Value>& args) {
Agent* a = Unwrap(args);
// Notify other thread that we are ready to process events
uv_sem_post(&a->start_sem_);
}
void Agent::NotifyWait(const FunctionCallbackInfo<Value>& args) {
Agent* a = Unwrap(args);
a->wait_ = false;
int err = uv_async_send(&a->child_signal_);
CHECK_EQ(err, 0);
}
void Agent::SendCommand(const FunctionCallbackInfo<Value>& args) {
Agent* a = Unwrap(args);
Environment* env = a->child_env();
HandleScope scope(env->isolate());
String::Value v(args[0]);
v8::Debug::SendCommand(a->parent_env()->isolate(), *v, v.length());
if (a->dispatch_handler_ != nullptr)
a->dispatch_handler_(a->parent_env());
}
void Agent::ThreadCb(Agent* agent) {
agent->WorkerRun();
}
void Agent::ChildSignalCb(uv_async_t* signal) {
Agent* a = ContainerOf(&Agent::child_signal_, signal);
Isolate* isolate = a->child_env()->isolate();
HandleScope scope(isolate);
Local<Object> api = PersistentToLocal(isolate, a->api_);
Mutex::ScopedLock scoped_lock(a->message_mutex_);
while (AgentMessage* msg = a->messages_.PopFront()) {
// Time to close everything
if (msg->data() == nullptr) {
delete msg;
MakeCallback(isolate, api, "onclose", 0, nullptr);
break;
}
// Waiting for client, do not send anything just yet
if (a->wait_) {
a->messages_.PushFront(msg); // Push message back into the ready queue.
break;
}
Local<Value> argv[] = {
String::NewFromTwoByte(isolate,
msg->data(),
String::kNormalString,
msg->length())
};
// Emit message
MakeCallback(isolate,
api,
"onmessage",
arraysize(argv),
argv);
delete msg;
}
}
void Agent::EnqueueMessage(AgentMessage* message) {
Mutex::ScopedLock scoped_lock(message_mutex_);
messages_.PushBack(message);
uv_async_send(&child_signal_);
}
void Agent::MessageHandler(const v8::Debug::Message& message) {
Isolate* isolate = message.GetIsolate();
Environment* env = Environment::GetCurrent(isolate);
if (env == nullptr)
return; // Called from a non-node context.
Agent* a = env->debugger_agent();
CHECK_NE(a, nullptr);
CHECK_EQ(isolate, a->parent_env()->isolate());
HandleScope scope(isolate);
Local<String> json = message.GetJSON();
String::Value v(json);
AgentMessage* msg = new AgentMessage(*v, v.length());
a->EnqueueMessage(msg);
}
} // namespace debugger
} // namespace node