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// Copyright 2017 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/extension_js_runner.h"
#include "base/bind.h"
#include "content/public/renderer/worker_thread.h"
#include "extensions/renderer/script_context.h"
#include "extensions/renderer/script_injection_callback.h"
#include "third_party/blink/public/web/web_local_frame.h"
namespace extensions {
ExtensionJSRunner::ExtensionJSRunner(ScriptContext* script_context)
: script_context_(script_context) {}
ExtensionJSRunner::~ExtensionJSRunner() {}
void ExtensionJSRunner::RunJSFunction(v8::Local<v8::Function> function,
v8::Local<v8::Context> context,
int argc,
v8::Local<v8::Value> argv[],
ResultCallback callback) {
ScriptInjectionCallback::CompleteCallback wrapper_callback;
if (callback) {
wrapper_callback =
base::BindOnce(&ExtensionJSRunner::OnFunctionComplete,
weak_factory_.GetWeakPtr(), std::move(callback));
}
// TODO(devlin): Move ScriptContext::SafeCallFunction() into here?
script_context_->SafeCallFunction(function, argc, argv,
std::move(wrapper_callback));
}
v8::MaybeLocal<v8::Value> ExtensionJSRunner::RunJSFunctionSync(
v8::Local<v8::Function> function,
v8::Local<v8::Context> context,
int argc,
v8::Local<v8::Value> argv[]) {
DCHECK(script_context_->v8_context() == context);
v8::Isolate* isolate = context->GetIsolate();
DCHECK(context == isolate->GetCurrentContext());
v8::MicrotasksScope microtasks(isolate,
v8::MicrotasksScope::kDoNotRunMicrotasks);
v8::Local<v8::Object> global = context->Global();
blink::WebLocalFrame* web_frame = script_context_->web_frame();
v8::MaybeLocal<v8::Value> result;
// NOTE(devlin): We use relatively unsafe execution variants here
// (WebLocalFrame::CallFunctionEvenIfScriptDisabled() and
// v8::Function::Call()); these ignore things like script suspension. We need
// to use these because RunJSFunctionSync() is used when in direct response
// to JS running, and JS that's running sometimes needs a synchronous
// response (such as when returning the value to a synchronous API or a
// newly-constructed object). It's a shame that we have to use them here, but
// at the end of the day, the right solution is to instead ensure that if
// script is suspended, JS is not running at all, and thus none of these
// entry points would be reached during suspension. It would be nice to reduce
// or eliminate the need for this method.
if (web_frame) {
result = web_frame->CallFunctionEvenIfScriptDisabled(function, global, argc,
argv);
} else {
result = function->Call(context, global, argc, argv);
}
return result;
}
void ExtensionJSRunner::OnFunctionComplete(
ResultCallback callback,
const std::vector<v8::Local<v8::Value>>& results) {
DCHECK(script_context_->is_valid());
v8::MaybeLocal<v8::Value> result;
if (!results.empty() && !results[0].IsEmpty())
result = results[0];
std::move(callback).Run(script_context_->v8_context(), result);
}
} // namespace extensions
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