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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/renderer/bindings/test_js_runner.h"
#include <ostream>
#include "base/functional/bind.h"
#include "content/public/renderer/v8_value_converter.h"
#include "extensions/renderer/bindings/api_binding_test_util.h"
namespace extensions {
namespace {
// NOTE(devlin): These aren't thread-safe. If we have multi-threaded unittests,
// we'll need to expand these.
bool g_allow_errors = false;
bool g_suspended = false;
std::optional<base::Value> Convert(v8::MaybeLocal<v8::Value> maybe_value,
v8::Local<v8::Context> context) {
v8::Local<v8::Value> v8_value;
if (!maybe_value.ToLocal(&v8_value))
return std::nullopt;
if (std::unique_ptr<base::Value> value =
content::V8ValueConverter::Create()->FromV8Value(v8_value, context)) {
return base::Value::FromUniquePtrValue(std::move(value));
}
return std::nullopt;
}
} // namespace
TestJSRunner::Scope::Scope(std::unique_ptr<JSRunner> runner)
: runner_(std::move(runner)),
old_runner_(JSRunner::GetInstanceForTesting()) {
DCHECK_NE(runner_.get(), old_runner_);
JSRunner::SetInstanceForTesting(runner_.get());
}
TestJSRunner::Scope::~Scope() {
DCHECK_EQ(runner_.get(), JSRunner::GetInstanceForTesting());
JSRunner::SetInstanceForTesting(old_runner_);
}
TestJSRunner::AllowErrors::AllowErrors() {
DCHECK(!g_allow_errors) << "Nested AllowErrors() blocks are not allowed.";
g_allow_errors = true;
}
TestJSRunner::AllowErrors::~AllowErrors() {
DCHECK(g_allow_errors);
g_allow_errors = false;
}
TestJSRunner::Suspension::Suspension() {
DCHECK(!g_suspended) << "Nested Suspension() blocks are not allowed.";
g_suspended = true;
}
TestJSRunner::Suspension::~Suspension() {
DCHECK(g_suspended);
g_suspended = false;
TestJSRunner* test_runner =
static_cast<TestJSRunner*>(JSRunner::GetInstanceForTesting());
DCHECK(test_runner);
test_runner->Flush();
}
TestJSRunner::PendingCall::PendingCall() = default;
TestJSRunner::PendingCall::~PendingCall() = default;
TestJSRunner::PendingCall::PendingCall(PendingCall&& other) = default;
TestJSRunner::TestJSRunner() = default;
TestJSRunner::TestJSRunner(const base::RepeatingClosure& will_call_js)
: will_call_js_(will_call_js) {}
TestJSRunner::~TestJSRunner() = default;
void TestJSRunner::RunJSFunction(v8::Local<v8::Function> function,
v8::Local<v8::Context> context,
base::span<v8::Local<v8::Value>> args,
ResultCallback callback) {
if (g_suspended) {
// Script is suspended. Queue up the call and return.
v8::Isolate* isolate = context->GetIsolate();
PendingCall call;
call.isolate = isolate;
call.function.Reset(isolate, function);
call.context.Reset(isolate, context);
call.arguments.reserve(args.size());
call.callback = std::move(callback);
for (auto& arg : args) {
call.arguments.push_back(v8::Global<v8::Value>(isolate, arg));
}
pending_calls_.push_back(std::move(call));
return;
}
// Functions should always run in the scope of the context.
v8::Context::Scope context_scope(context);
if (will_call_js_)
will_call_js_.Run();
v8::MaybeLocal<v8::Value> result;
if (g_allow_errors) {
result =
function->Call(context, context->Global(), args.size(), GetArgv(args));
} else {
result = RunFunctionOnGlobal(function, context, args.size(), GetArgv(args));
}
if (callback)
std::move(callback).Run(context, Convert(result, context));
}
v8::MaybeLocal<v8::Value> TestJSRunner::RunJSFunctionSync(
v8::Local<v8::Function> function,
v8::Local<v8::Context> context,
base::span<v8::Local<v8::Value>> args) {
// Note: deliberately circumvent g_suspension, since this should only be used
// in response to JS interaction.
if (will_call_js_)
will_call_js_.Run();
if (g_allow_errors) {
v8::MaybeLocal<v8::Value> result =
function->Call(context, context->Global(), args.size(), GetArgv(args));
return result;
}
return RunFunctionOnGlobal(function, context, args.size(), GetArgv(args));
}
void TestJSRunner::Flush() {
// Move pending_calls_ in case running any pending calls results in more calls
// into the JSRunner.
std::vector<PendingCall> calls = std::move(pending_calls_);
pending_calls_.clear();
for (auto& call : calls) {
v8::Isolate* isolate = call.isolate;
v8::Local<v8::Context> context = call.context.Get(isolate);
v8::Context::Scope context_scope(context);
v8::LocalVector<v8::Value> local_arguments(isolate);
local_arguments.reserve(call.arguments.size());
for (auto& arg : call.arguments)
local_arguments.push_back(arg.Get(isolate));
v8::MaybeLocal<v8::Value> result =
RunJSFunctionSync(call.function.Get(isolate), context, local_arguments);
if (call.callback)
std::move(call.callback).Run(context, Convert(result, context));
}
}
} // namespace extensions
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