react-native/ReactCommon/cxxreact/JSCNativeModules.cpp

74 lines
2.1 KiB
C++

// Copyright 2004-present Facebook. All Rights Reserved.
#include "JSCNativeModules.h"
#include <string>
#include "ModuleRegistry.h"
#include "ReactMarker.h"
namespace facebook {
namespace react {
JSCNativeModules::JSCNativeModules(std::shared_ptr<ModuleRegistry> moduleRegistry) :
m_moduleRegistry(std::move(moduleRegistry)) {}
JSValueRef JSCNativeModules::getModule(JSContextRef context, JSStringRef jsName) {
if (!m_moduleRegistry) {
return nullptr;
}
std::string moduleName = String::ref(context, jsName).str();
const auto it = m_objects.find(moduleName);
if (it != m_objects.end()) {
return static_cast<JSObjectRef>(it->second);
}
auto module = createModule(moduleName, context);
if (!module.hasValue()) {
// Allow lookup to continue in the objects own properties, which allows for overrides of NativeModules
return nullptr;
}
// Protect since we'll be holding on to this value, even though JS may not
module->makeProtected();
auto result = m_objects.emplace(std::move(moduleName), std::move(*module)).first;
return static_cast<JSObjectRef>(result->second);
}
void JSCNativeModules::reset() {
m_genNativeModuleJS = nullptr;
m_objects.clear();
}
folly::Optional<Object> JSCNativeModules::createModule(const std::string& name, JSContextRef context) {
ReactMarker::logTaggedMarker(ReactMarker::NATIVE_MODULE_SETUP_START, name.c_str());
if (!m_genNativeModuleJS) {
auto global = Object::getGlobalObject(context);
m_genNativeModuleJS = global.getProperty("__fbGenNativeModule").asObject();
m_genNativeModuleJS->makeProtected();
}
auto result = m_moduleRegistry->getConfig(name);
if (!result.hasValue()) {
return nullptr;
}
Value moduleInfo = m_genNativeModuleJS->callAsFunction({
Value::fromDynamic(context, result->config),
Value::makeNumber(context, result->index)
});
CHECK(!moduleInfo.isNull()) << "Module returned from genNativeModule is null";
folly::Optional<Object> module(moduleInfo.asObject().getProperty("module").asObject());
ReactMarker::logTaggedMarker(ReactMarker::NATIVE_MODULE_SETUP_STOP, name.c_str());
return module;
}
} }