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|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/renderer/module_system.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/debug/trace_event.h"
#include "base/stl_util.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "content/public/renderer/render_frame.h"
#include "content/public/renderer/render_view.h"
#include "extensions/common/extension.h"
#include "extensions/common/extensions_client.h"
#include "extensions/renderer/console.h"
#include "extensions/renderer/safe_builtins.h"
#include "extensions/renderer/script_context.h"
#include "gin/modules/module_registry.h"
#include "third_party/WebKit/public/web/WebFrame.h"
#include "third_party/WebKit/public/web/WebScopedMicrotaskSuppression.h"
namespace extensions {
namespace {
const char* kModuleSystem = "module_system";
const char* kModuleName = "module_name";
const char* kModuleField = "module_field";
const char* kModulesField = "modules";
// Logs a fatal error for the calling context, with some added metadata about
// the context:
// - Its type (blessed, unblessed, etc).
// - Whether it's valid.
// - The extension ID, if one exists.
//
// This will only actual be fatal in in dev/canary, since in too many cases
// we're at the mercy of the extension or web page's environment. They can mess
// up our JS in unexpected ways. Hopefully dev/canary channel will pick up such
// problems, but given the wider variety on stable/beta it's impossible to know.
void Fatal(ScriptContext* context, const std::string& message) {
// Prepend some context metadata.
std::string full_message = "(";
if (!context->is_valid())
full_message += "Invalid ";
full_message += context->GetContextTypeDescription();
full_message += " context";
if (context->extension()) {
full_message += " for ";
full_message += context->extension()->id();
}
full_message += ") ";
full_message += message;
if (ExtensionsClient::Get()->ShouldSuppressFatalErrors())
console::Error(context->isolate()->GetCallingContext(), full_message);
else
console::Fatal(context->isolate()->GetCallingContext(), full_message);
}
void Warn(v8::Isolate* isolate, const std::string& message) {
console::Warn(isolate->GetCallingContext(), message);
}
// Default exception handler which logs the exception.
class DefaultExceptionHandler : public ModuleSystem::ExceptionHandler {
public:
explicit DefaultExceptionHandler(ScriptContext* context)
: context_(context) {}
// Fatally dumps the debug info from |try_catch| to the console.
// Make sure this is never used for exceptions that originate in external
// code!
void HandleUncaughtException(const v8::TryCatch& try_catch) override {
v8::HandleScope handle_scope(context_->isolate());
std::string stack_trace = "<stack trace unavailable>";
if (!try_catch.StackTrace().IsEmpty()) {
v8::String::Utf8Value stack_value(try_catch.StackTrace());
if (*stack_value)
stack_trace.assign(*stack_value, stack_value.length());
else
stack_trace = "<could not convert stack trace to string>";
}
Fatal(context_, CreateExceptionString(try_catch) + "{" + stack_trace + "}");
}
private:
ScriptContext* context_;
};
} // namespace
std::string ModuleSystem::ExceptionHandler::CreateExceptionString(
const v8::TryCatch& try_catch) {
v8::Handle<v8::Message> message(try_catch.Message());
if (message.IsEmpty()) {
return "try_catch has no message";
}
std::string resource_name = "<unknown resource>";
if (!message->GetScriptOrigin().ResourceName().IsEmpty()) {
v8::String::Utf8Value resource_name_v8(
message->GetScriptOrigin().ResourceName());
resource_name.assign(*resource_name_v8, resource_name_v8.length());
}
std::string error_message = "<no error message>";
if (!message->Get().IsEmpty()) {
v8::String::Utf8Value error_message_v8(message->Get());
error_message.assign(*error_message_v8, error_message_v8.length());
}
return base::StringPrintf("%s:%d: %s",
resource_name.c_str(),
message->GetLineNumber(),
error_message.c_str());
}
ModuleSystem::ModuleSystem(ScriptContext* context, SourceMap* source_map)
: ObjectBackedNativeHandler(context),
context_(context),
source_map_(source_map),
natives_enabled_(0),
exception_handler_(new DefaultExceptionHandler(context)),
weak_factory_(this) {
RouteFunction(
"require",
base::Bind(&ModuleSystem::RequireForJs, base::Unretained(this)));
RouteFunction(
"requireNative",
base::Bind(&ModuleSystem::RequireNative, base::Unretained(this)));
RouteFunction(
"requireAsync",
base::Bind(&ModuleSystem::RequireAsync, base::Unretained(this)));
RouteFunction("privates",
base::Bind(&ModuleSystem::Private, base::Unretained(this)));
v8::Handle<v8::Object> global(context->v8_context()->Global());
v8::Isolate* isolate = context->isolate();
global->SetHiddenValue(v8::String::NewFromUtf8(isolate, kModulesField),
v8::Object::New(isolate));
global->SetHiddenValue(v8::String::NewFromUtf8(isolate, kModuleSystem),
v8::External::New(isolate, this));
gin::ModuleRegistry::From(context->v8_context())->AddObserver(this);
if (context_->GetRenderFrame()) {
context_->GetRenderFrame()->EnsureMojoBuiltinsAreAvailable(
context->isolate(), context->v8_context());
}
}
ModuleSystem::~ModuleSystem() { Invalidate(); }
void ModuleSystem::Invalidate() {
if (!is_valid())
return;
// Clear the module system properties from the global context. It's polite,
// and we use this as a signal in lazy handlers that we no longer exist.
{
v8::HandleScope scope(GetIsolate());
v8::Handle<v8::Object> global = context()->v8_context()->Global();
global->DeleteHiddenValue(
v8::String::NewFromUtf8(GetIsolate(), kModulesField));
global->DeleteHiddenValue(
v8::String::NewFromUtf8(GetIsolate(), kModuleSystem));
}
// Invalidate all of the successfully required handlers we own.
for (NativeHandlerMap::iterator it = native_handler_map_.begin();
it != native_handler_map_.end();
++it) {
it->second->Invalidate();
}
ObjectBackedNativeHandler::Invalidate();
}
ModuleSystem::NativesEnabledScope::NativesEnabledScope(
ModuleSystem* module_system)
: module_system_(module_system) {
module_system_->natives_enabled_++;
}
ModuleSystem::NativesEnabledScope::~NativesEnabledScope() {
module_system_->natives_enabled_--;
CHECK_GE(module_system_->natives_enabled_, 0);
}
void ModuleSystem::HandleException(const v8::TryCatch& try_catch) {
exception_handler_->HandleUncaughtException(try_catch);
}
v8::Handle<v8::Value> ModuleSystem::Require(const std::string& module_name) {
v8::EscapableHandleScope handle_scope(GetIsolate());
return handle_scope.Escape(RequireForJsInner(
v8::String::NewFromUtf8(GetIsolate(), module_name.c_str())));
}
void ModuleSystem::RequireForJs(
const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Handle<v8::String> module_name = args[0]->ToString(args.GetIsolate());
args.GetReturnValue().Set(RequireForJsInner(module_name));
}
v8::Local<v8::Value> ModuleSystem::RequireForJsInner(
v8::Handle<v8::String> module_name) {
v8::EscapableHandleScope handle_scope(GetIsolate());
v8::Context::Scope context_scope(context()->v8_context());
v8::Handle<v8::Object> global(context()->v8_context()->Global());
// The module system might have been deleted. This can happen if a different
// context keeps a reference to us, but our frame is destroyed (e.g.
// background page keeps reference to chrome object in a closed popup).
v8::Handle<v8::Value> modules_value = global->GetHiddenValue(
v8::String::NewFromUtf8(GetIsolate(), kModulesField));
if (modules_value.IsEmpty() || modules_value->IsUndefined()) {
Warn(GetIsolate(), "Extension view no longer exists");
return v8::Undefined(GetIsolate());
}
v8::Handle<v8::Object> modules(v8::Handle<v8::Object>::Cast(modules_value));
v8::Local<v8::Value> exports(modules->Get(module_name));
if (!exports->IsUndefined())
return handle_scope.Escape(exports);
exports = LoadModule(*v8::String::Utf8Value(module_name));
modules->Set(module_name, exports);
return handle_scope.Escape(exports);
}
v8::Local<v8::Value> ModuleSystem::CallModuleMethod(
const std::string& module_name,
const std::string& method_name) {
v8::EscapableHandleScope handle_scope(GetIsolate());
v8::Handle<v8::Value> no_args;
return handle_scope.Escape(
CallModuleMethod(module_name, method_name, 0, &no_args));
}
v8::Local<v8::Value> ModuleSystem::CallModuleMethod(
const std::string& module_name,
const std::string& method_name,
std::vector<v8::Handle<v8::Value> >* args) {
return CallModuleMethod(
module_name, method_name, args->size(), vector_as_array(args));
}
v8::Local<v8::Value> ModuleSystem::CallModuleMethod(
const std::string& module_name,
const std::string& method_name,
int argc,
v8::Handle<v8::Value> argv[]) {
TRACE_EVENT2("v8",
"v8.callModuleMethod",
"module_name",
module_name,
"method_name",
method_name);
v8::EscapableHandleScope handle_scope(GetIsolate());
v8::Context::Scope context_scope(context()->v8_context());
v8::Local<v8::Value> module;
{
NativesEnabledScope natives_enabled(this);
module = RequireForJsInner(
v8::String::NewFromUtf8(GetIsolate(), module_name.c_str()));
}
if (module.IsEmpty() || !module->IsObject()) {
Fatal(context_,
"Failed to get module " + module_name + " to call " + method_name);
return handle_scope.Escape(
v8::Local<v8::Primitive>(v8::Undefined(GetIsolate())));
}
v8::Local<v8::Value> value = v8::Handle<v8::Object>::Cast(module)->Get(
v8::String::NewFromUtf8(GetIsolate(), method_name.c_str()));
if (value.IsEmpty() || !value->IsFunction()) {
Fatal(context_, module_name + "." + method_name + " is not a function");
return handle_scope.Escape(
v8::Local<v8::Primitive>(v8::Undefined(GetIsolate())));
}
v8::Handle<v8::Function> func = v8::Handle<v8::Function>::Cast(value);
v8::Local<v8::Value> result;
{
v8::TryCatch try_catch;
try_catch.SetCaptureMessage(true);
result = context_->CallFunction(func, argc, argv);
if (try_catch.HasCaught())
HandleException(try_catch);
}
return handle_scope.Escape(result);
}
void ModuleSystem::RegisterNativeHandler(
const std::string& name,
scoped_ptr<NativeHandler> native_handler) {
native_handler_map_[name] =
linked_ptr<NativeHandler>(native_handler.release());
}
void ModuleSystem::OverrideNativeHandlerForTest(const std::string& name) {
overridden_native_handlers_.insert(name);
}
void ModuleSystem::RunString(const std::string& code, const std::string& name) {
v8::HandleScope handle_scope(GetIsolate());
RunString(v8::String::NewFromUtf8(GetIsolate(), code.c_str()),
v8::String::NewFromUtf8(GetIsolate(), name.c_str()));
}
// static
void ModuleSystem::NativeLazyFieldGetter(
v8::Local<v8::String> property,
const v8::PropertyCallbackInfo<v8::Value>& info) {
LazyFieldGetterInner(property, info, &ModuleSystem::RequireNativeFromString);
}
// static
void ModuleSystem::LazyFieldGetter(
v8::Local<v8::String> property,
const v8::PropertyCallbackInfo<v8::Value>& info) {
LazyFieldGetterInner(property, info, &ModuleSystem::Require);
}
// static
void ModuleSystem::LazyFieldGetterInner(
v8::Local<v8::String> property,
const v8::PropertyCallbackInfo<v8::Value>& info,
RequireFunction require_function) {
CHECK(!info.Data().IsEmpty());
CHECK(info.Data()->IsObject());
v8::HandleScope handle_scope(info.GetIsolate());
v8::Handle<v8::Object> parameters = v8::Handle<v8::Object>::Cast(info.Data());
// This context should be the same as context()->v8_context().
v8::Handle<v8::Context> context = parameters->CreationContext();
v8::Handle<v8::Object> global(context->Global());
v8::Handle<v8::Value> module_system_value = global->GetHiddenValue(
v8::String::NewFromUtf8(info.GetIsolate(), kModuleSystem));
if (module_system_value.IsEmpty() || !module_system_value->IsExternal()) {
// ModuleSystem has been deleted.
// TODO(kalman): See comment in header file.
Warn(info.GetIsolate(),
"Module system has been deleted, does extension view exist?");
return;
}
ModuleSystem* module_system = static_cast<ModuleSystem*>(
v8::Handle<v8::External>::Cast(module_system_value)->Value());
std::string name = *v8::String::Utf8Value(parameters->Get(
v8::String::NewFromUtf8(info.GetIsolate(), kModuleName)));
// Switch to our v8 context because we need functions created while running
// the require()d module to belong to our context, not the current one.
v8::Context::Scope context_scope(context);
NativesEnabledScope natives_enabled_scope(module_system);
v8::TryCatch try_catch;
v8::Handle<v8::Value> module_value = (module_system->*require_function)(name);
if (try_catch.HasCaught()) {
module_system->HandleException(try_catch);
return;
}
if (module_value.IsEmpty() || !module_value->IsObject()) {
// require_function will have already logged this, we don't need to.
return;
}
v8::Handle<v8::Object> module = v8::Handle<v8::Object>::Cast(module_value);
v8::Handle<v8::String> field =
parameters->Get(v8::String::NewFromUtf8(info.GetIsolate(), kModuleField))
->ToString(info.GetIsolate());
if (!module->Has(field)) {
std::string field_str = *v8::String::Utf8Value(field);
Fatal(module_system->context_,
"Lazy require of " + name + "." + field_str + " did not set the " +
field_str + " field");
return;
}
v8::Local<v8::Value> new_field = module->Get(field);
if (try_catch.HasCaught()) {
module_system->HandleException(try_catch);
return;
}
// Ok for it to be undefined, among other things it's how bindings signify
// that the extension doesn't have permission to use them.
CHECK(!new_field.IsEmpty());
// Delete the getter and set this field to |new_field| so the same object is
// returned every time a certain API is accessed.
v8::Handle<v8::Value> val = info.This();
if (val->IsObject()) {
v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(val);
object->Delete(property);
object->Set(property, new_field);
} else {
NOTREACHED();
}
info.GetReturnValue().Set(new_field);
}
void ModuleSystem::SetLazyField(v8::Handle<v8::Object> object,
const std::string& field,
const std::string& module_name,
const std::string& module_field) {
SetLazyField(
object, field, module_name, module_field, &ModuleSystem::LazyFieldGetter);
}
void ModuleSystem::SetLazyField(v8::Handle<v8::Object> object,
const std::string& field,
const std::string& module_name,
const std::string& module_field,
v8::AccessorGetterCallback getter) {
v8::HandleScope handle_scope(GetIsolate());
v8::Handle<v8::Object> parameters = v8::Object::New(GetIsolate());
parameters->Set(v8::String::NewFromUtf8(GetIsolate(), kModuleName),
v8::String::NewFromUtf8(GetIsolate(), module_name.c_str()));
parameters->Set(v8::String::NewFromUtf8(GetIsolate(), kModuleField),
v8::String::NewFromUtf8(GetIsolate(), module_field.c_str()));
object->SetAccessor(v8::String::NewFromUtf8(GetIsolate(), field.c_str()),
getter,
NULL,
parameters);
}
void ModuleSystem::SetNativeLazyField(v8::Handle<v8::Object> object,
const std::string& field,
const std::string& module_name,
const std::string& module_field) {
SetLazyField(object,
field,
module_name,
module_field,
&ModuleSystem::NativeLazyFieldGetter);
}
v8::Handle<v8::Value> ModuleSystem::RunString(v8::Handle<v8::String> code,
v8::Handle<v8::String> name) {
v8::EscapableHandleScope handle_scope(GetIsolate());
v8::Context::Scope context_scope(context()->v8_context());
// Prepend extensions:: to |name| so that internal code can be differentiated
// from external code in stack traces. This has no effect on behaviour.
std::string internal_name =
base::StringPrintf("extensions::%s", *v8::String::Utf8Value(name));
blink::WebScopedMicrotaskSuppression suppression;
v8::TryCatch try_catch;
try_catch.SetCaptureMessage(true);
v8::Handle<v8::Script> script(
v8::Script::Compile(code,
v8::String::NewFromUtf8(GetIsolate(),
internal_name.c_str(),
v8::String::kNormalString,
internal_name.size())));
if (try_catch.HasCaught()) {
HandleException(try_catch);
return v8::Undefined(GetIsolate());
}
v8::Local<v8::Value> result = script->Run();
if (try_catch.HasCaught()) {
HandleException(try_catch);
return v8::Undefined(GetIsolate());
}
return handle_scope.Escape(result);
}
v8::Handle<v8::Value> ModuleSystem::GetSource(const std::string& module_name) {
v8::EscapableHandleScope handle_scope(GetIsolate());
if (!source_map_->Contains(module_name))
return v8::Undefined(GetIsolate());
return handle_scope.Escape(
v8::Local<v8::Value>(source_map_->GetSource(GetIsolate(), module_name)));
}
void ModuleSystem::RequireNative(
const v8::FunctionCallbackInfo<v8::Value>& args) {
CHECK_EQ(1, args.Length());
std::string native_name = *v8::String::Utf8Value(args[0]);
args.GetReturnValue().Set(RequireNativeFromString(native_name));
}
v8::Handle<v8::Value> ModuleSystem::RequireNativeFromString(
const std::string& native_name) {
if (natives_enabled_ == 0) {
// HACK: if in test throw exception so that we can test the natives-disabled
// logic; however, under normal circumstances, this is programmer error so
// we could crash.
if (exception_handler_) {
return GetIsolate()->ThrowException(
v8::String::NewFromUtf8(GetIsolate(), "Natives disabled"));
}
Fatal(context_, "Natives disabled for requireNative(" + native_name + ")");
return v8::Undefined(GetIsolate());
}
if (overridden_native_handlers_.count(native_name) > 0u) {
return RequireForJsInner(
v8::String::NewFromUtf8(GetIsolate(), native_name.c_str()));
}
NativeHandlerMap::iterator i = native_handler_map_.find(native_name);
if (i == native_handler_map_.end()) {
Fatal(context_,
"Couldn't find native for requireNative(" + native_name + ")");
return v8::Undefined(GetIsolate());
}
return i->second->NewInstance();
}
void ModuleSystem::RequireAsync(
const v8::FunctionCallbackInfo<v8::Value>& args) {
CHECK_EQ(1, args.Length());
std::string module_name = *v8::String::Utf8Value(args[0]);
v8::Handle<v8::Promise::Resolver> resolver(
v8::Promise::Resolver::New(GetIsolate()));
args.GetReturnValue().Set(resolver->GetPromise());
scoped_ptr<v8::UniquePersistent<v8::Promise::Resolver> > persistent_resolver(
new v8::UniquePersistent<v8::Promise::Resolver>(GetIsolate(), resolver));
gin::ModuleRegistry* module_registry =
gin::ModuleRegistry::From(context_->v8_context());
if (!module_registry) {
Warn(GetIsolate(), "Extension view no longer exists");
resolver->Reject(v8::Exception::Error(v8::String::NewFromUtf8(
GetIsolate(), "Extension view no longer exists")));
return;
}
module_registry->LoadModule(GetIsolate(),
module_name,
base::Bind(&ModuleSystem::OnModuleLoaded,
weak_factory_.GetWeakPtr(),
base::Passed(&persistent_resolver)));
if (module_registry->available_modules().count(module_name) == 0)
LoadModule(module_name);
}
v8::Handle<v8::String> ModuleSystem::WrapSource(v8::Handle<v8::String> source) {
v8::EscapableHandleScope handle_scope(GetIsolate());
// Keep in order with the arguments in RequireForJsInner.
v8::Handle<v8::String> left = v8::String::NewFromUtf8(
GetIsolate(),
"(function(define, require, requireNative, requireAsync, exports, "
"console, privates,"
"$Array, $Function, $JSON, $Object, $RegExp, $String, $Error) {"
"'use strict';");
v8::Handle<v8::String> right = v8::String::NewFromUtf8(GetIsolate(), "\n})");
return handle_scope.Escape(v8::Local<v8::String>(
v8::String::Concat(left, v8::String::Concat(source, right))));
}
void ModuleSystem::Private(const v8::FunctionCallbackInfo<v8::Value>& args) {
CHECK_EQ(1, args.Length());
if (!args[0]->IsObject() || args[0]->IsNull()) {
GetIsolate()->ThrowException(
v8::Exception::TypeError(v8::String::NewFromUtf8(GetIsolate(),
args[0]->IsUndefined()
? "Method called without a valid receiver (this). "
"Did you forget to call .bind()?"
: "Invalid invocation: receiver is not an object!")));
return;
}
v8::Local<v8::Object> obj = args[0].As<v8::Object>();
v8::Local<v8::String> privates_key =
v8::String::NewFromUtf8(GetIsolate(), "privates");
v8::Local<v8::Value> privates = obj->GetHiddenValue(privates_key);
if (privates.IsEmpty()) {
privates = v8::Object::New(args.GetIsolate());
if (privates.IsEmpty()) {
GetIsolate()->ThrowException(
v8::String::NewFromUtf8(GetIsolate(), "Failed to create privates"));
return;
}
obj->SetHiddenValue(privates_key, privates);
}
args.GetReturnValue().Set(privates);
}
v8::Handle<v8::Value> ModuleSystem::LoadModule(const std::string& module_name) {
v8::EscapableHandleScope handle_scope(GetIsolate());
v8::Context::Scope context_scope(context()->v8_context());
v8::Handle<v8::Value> source(GetSource(module_name));
if (source.IsEmpty() || source->IsUndefined()) {
Fatal(context_, "No source for require(" + module_name + ")");
return v8::Undefined(GetIsolate());
}
v8::Handle<v8::String> wrapped_source(
WrapSource(v8::Handle<v8::String>::Cast(source)));
// Modules are wrapped in (function(){...}) so they always return functions.
v8::Handle<v8::Value> func_as_value =
RunString(wrapped_source,
v8::String::NewFromUtf8(GetIsolate(), module_name.c_str()));
if (func_as_value.IsEmpty() || func_as_value->IsUndefined()) {
Fatal(context_, "Bad source for require(" + module_name + ")");
return v8::Undefined(GetIsolate());
}
v8::Handle<v8::Function> func = v8::Handle<v8::Function>::Cast(func_as_value);
v8::Handle<v8::Object> define_object = v8::Object::New(GetIsolate());
gin::ModuleRegistry::InstallGlobals(GetIsolate(), define_object);
v8::Local<v8::Value> exports = v8::Object::New(GetIsolate());
v8::Handle<v8::Object> natives(NewInstance());
CHECK(!natives.IsEmpty()); // this can happen if v8 has issues
// These must match the argument order in WrapSource.
v8::Handle<v8::Value> args[] = {
// AMD.
define_object->Get(v8::String::NewFromUtf8(GetIsolate(), "define")),
// CommonJS.
natives->Get(v8::String::NewFromUtf8(
GetIsolate(), "require", v8::String::kInternalizedString)),
natives->Get(v8::String::NewFromUtf8(
GetIsolate(), "requireNative", v8::String::kInternalizedString)),
natives->Get(v8::String::NewFromUtf8(
GetIsolate(), "requireAsync", v8::String::kInternalizedString)),
exports,
// Libraries that we magically expose to every module.
console::AsV8Object(GetIsolate()),
natives->Get(v8::String::NewFromUtf8(
GetIsolate(), "privates", v8::String::kInternalizedString)),
// Each safe builtin. Keep in order with the arguments in WrapSource.
context_->safe_builtins()->GetArray(),
context_->safe_builtins()->GetFunction(),
context_->safe_builtins()->GetJSON(),
context_->safe_builtins()->GetObjekt(),
context_->safe_builtins()->GetRegExp(),
context_->safe_builtins()->GetString(),
context_->safe_builtins()->GetError(),
};
{
v8::TryCatch try_catch;
try_catch.SetCaptureMessage(true);
context_->CallFunction(func, arraysize(args), args);
if (try_catch.HasCaught()) {
HandleException(try_catch);
return v8::Undefined(GetIsolate());
}
}
return handle_scope.Escape(exports);
}
void ModuleSystem::OnDidAddPendingModule(
const std::string& id,
const std::vector<std::string>& dependencies) {
bool module_system_managed = source_map_->Contains(id);
gin::ModuleRegistry* registry =
gin::ModuleRegistry::From(context_->v8_context());
DCHECK(registry);
for (const auto& dependency : dependencies) {
// If a dependency is not available, and either the module or this
// dependency is managed by ModuleSystem, attempt to load it. Other
// gin::ModuleRegistry users (WebUI and users of the mojoPrivate API) are
// responsible for loading their module dependencies when required.
if (registry->available_modules().count(dependency) == 0 &&
(module_system_managed || source_map_->Contains(dependency))) {
LoadModule(dependency);
}
}
registry->AttemptToLoadMoreModules(GetIsolate());
}
void ModuleSystem::OnModuleLoaded(
scoped_ptr<v8::UniquePersistent<v8::Promise::Resolver> > resolver,
v8::Handle<v8::Value> value) {
if (!is_valid())
return;
v8::HandleScope handle_scope(GetIsolate());
v8::Handle<v8::Promise::Resolver> resolver_local(
v8::Local<v8::Promise::Resolver>::New(GetIsolate(), *resolver));
resolver_local->Resolve(value);
}
} // namespace extensions
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