react-native/ReactCommon/cxxreact/NativeToJsBridge.cpp

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// Copyright 2004-present Facebook. All Rights Reserved.
#include "NativeToJsBridge.h"
#include <folly/json.h>
#include <folly/Memory.h>
#include <folly/MoveWrapper.h>
#include "Instance.h"
#include "JSBigString.h"
#include "SystraceSection.h"
#include "MethodCall.h"
#include "MessageQueueThread.h"
#include "RAMBundleRegistry.h"
#ifdef WITH_FBSYSTRACE
#include <fbsystrace.h>
using fbsystrace::FbSystraceAsyncFlow;
#endif
namespace facebook {
namespace react {
// This class manages calls from JS to native code.
class JsToNativeBridge : public react::ExecutorDelegate {
public:
JsToNativeBridge(std::shared_ptr<ModuleRegistry> registry,
std::shared_ptr<InstanceCallback> callback)
: m_registry(registry)
, m_callback(callback) {}
std::shared_ptr<ModuleRegistry> getModuleRegistry() override {
return m_registry;
}
void callNativeModules(
JSExecutor& executor, folly::dynamic&& calls, bool isEndOfBatch) override {
CHECK(m_registry || calls.empty()) <<
"native module calls cannot be completed with no native modules";
m_batchHadNativeModuleCalls = m_batchHadNativeModuleCalls || !calls.empty();
// An exception anywhere in here stops processing of the batch. This
// was the behavior of the Android bridge, and since exception handling
// terminates the whole bridge, there's not much point in continuing.
for (auto& call : parseMethodCalls(std::move(calls))) {
m_registry->callNativeMethod(call.moduleId, call.methodId, std::move(call.arguments), call.callId);
}
if (isEndOfBatch) {
// onBatchComplete will be called on the native (module) queue, but
// decrementPendingJSCalls will be called sync. Be aware that the bridge may still
// be processing native calls when the birdge idle signaler fires.
if (m_batchHadNativeModuleCalls) {
m_callback->onBatchComplete();
m_batchHadNativeModuleCalls = false;
}
m_callback->decrementPendingJSCalls();
}
}
MethodCallResult callSerializableNativeHook(
JSExecutor& executor, unsigned int moduleId, unsigned int methodId,
folly::dynamic&& args) override {
return m_registry->callSerializableNativeHook(moduleId, methodId, std::move(args));
}
private:
// These methods are always invoked from an Executor. The NativeToJsBridge
// keeps a reference to the executor, and when destroy() is called, the
// executor is destroyed synchronously on its queue.
std::shared_ptr<ModuleRegistry> m_registry;
std::shared_ptr<InstanceCallback> m_callback;
bool m_batchHadNativeModuleCalls = false;
};
NativeToJsBridge::NativeToJsBridge(
JSExecutorFactory* jsExecutorFactory,
std::shared_ptr<ModuleRegistry> registry,
std::shared_ptr<MessageQueueThread> jsQueue,
std::shared_ptr<InstanceCallback> callback)
: m_destroyed(std::make_shared<bool>(false))
, m_delegate(std::make_shared<JsToNativeBridge>(registry, callback))
, m_executor(jsExecutorFactory->createJSExecutor(m_delegate, jsQueue))
, m_executorMessageQueueThread(std::move(jsQueue)) {}
// This must be called on the same thread on which the constructor was called.
NativeToJsBridge::~NativeToJsBridge() {
CHECK(*m_destroyed) <<
"NativeToJsBridge::destroy() must be called before deallocating the NativeToJsBridge!";
}
void NativeToJsBridge::loadApplication(
std::unique_ptr<RAMBundleRegistry> bundleRegistry,
std::unique_ptr<const JSBigString> startupScript,
std::string startupScriptSourceURL) {
runOnExecutorQueue(
[bundleRegistryWrap=folly::makeMoveWrapper(std::move(bundleRegistry)),
startupScript=folly::makeMoveWrapper(std::move(startupScript)),
startupScriptSourceURL=std::move(startupScriptSourceURL)]
(JSExecutor* executor) mutable {
auto bundleRegistry = bundleRegistryWrap.move();
if (bundleRegistry) {
executor->setBundleRegistry(std::move(bundleRegistry));
}
executor->loadApplicationScript(std::move(*startupScript),
std::move(startupScriptSourceURL));
});
}
void NativeToJsBridge::loadApplicationSync(
std::unique_ptr<RAMBundleRegistry> bundleRegistry,
std::unique_ptr<const JSBigString> startupScript,
std::string startupScriptSourceURL) {
if (bundleRegistry) {
m_executor->setBundleRegistry(std::move(bundleRegistry));
}
m_executor->loadApplicationScript(std::move(startupScript),
std::move(startupScriptSourceURL));
}
void NativeToJsBridge::callFunction(
std::string&& module,
std::string&& method,
folly::dynamic&& arguments) {
int systraceCookie = -1;
#ifdef WITH_FBSYSTRACE
systraceCookie = m_systraceCookie++;
FbSystraceAsyncFlow::begin(
TRACE_TAG_REACT_CXX_BRIDGE,
"JSCall",
systraceCookie);
#endif
runOnExecutorQueue([module = std::move(module), method = std::move(method), arguments = std::move(arguments), systraceCookie]
(JSExecutor* executor) {
#ifdef WITH_FBSYSTRACE
FbSystraceAsyncFlow::end(
TRACE_TAG_REACT_CXX_BRIDGE,
"JSCall",
systraceCookie);
SystraceSection s("NativeToJsBridge::callFunction", "module", module, "method", method);
#endif
// This is safe because we are running on the executor's thread: it won't
// destruct until after it's been unregistered (which we check above) and
// that will happen on this thread
executor->callFunction(module, method, arguments);
});
}
void NativeToJsBridge::invokeCallback(double callbackId, folly::dynamic&& arguments) {
int systraceCookie = -1;
#ifdef WITH_FBSYSTRACE
systraceCookie = m_systraceCookie++;
FbSystraceAsyncFlow::begin(
TRACE_TAG_REACT_CXX_BRIDGE,
"<callback>",
systraceCookie);
#endif
runOnExecutorQueue([callbackId, arguments = std::move(arguments), systraceCookie]
(JSExecutor* executor) {
#ifdef WITH_FBSYSTRACE
FbSystraceAsyncFlow::end(
TRACE_TAG_REACT_CXX_BRIDGE,
"<callback>",
systraceCookie);
SystraceSection s("NativeToJsBridge::invokeCallback");
#endif
executor->invokeCallback(callbackId, arguments);
});
}
void NativeToJsBridge::setGlobalVariable(std::string propName,
std::unique_ptr<const JSBigString> jsonValue) {
runOnExecutorQueue([propName=std::move(propName), jsonValue=folly::makeMoveWrapper(std::move(jsonValue))]
(JSExecutor* executor) mutable {
executor->setGlobalVariable(propName, jsonValue.move());
});
}
void* NativeToJsBridge::getJavaScriptContext() {
// TODO(cjhopman): this seems unsafe unless we require that it is only called on the main js queue.
return m_executor->getJavaScriptContext();
}
#ifdef WITH_JSC_MEMORY_PRESSURE
void NativeToJsBridge::handleMemoryPressure(int pressureLevel) {
runOnExecutorQueue([=] (JSExecutor* executor) {
executor->handleMemoryPressure(pressureLevel);
});
}
#endif
void NativeToJsBridge::destroy() {
// All calls made through runOnExecutorQueue have an early exit if
// m_destroyed is true. Setting this before the runOnQueueSync will cause
// pending work to be cancelled and we won't have to wait for it.
*m_destroyed = true;
m_executorMessageQueueThread->runOnQueueSync([this] {
m_executor->destroy();
m_executorMessageQueueThread->quitSynchronous();
m_executor = nullptr;
});
}
void NativeToJsBridge::runOnExecutorQueue(std::function<void(JSExecutor*)> task) {
if (*m_destroyed) {
return;
}
std::shared_ptr<bool> isDestroyed = m_destroyed;
m_executorMessageQueueThread->runOnQueue([this, isDestroyed, task=std::move(task)] {
if (*isDestroyed) {
return;
}
// The executor is guaranteed to be valid for the duration of the task because:
// 1. the executor is only destroyed after it is unregistered
// 2. the executor is unregistered on this queue
// 3. we just confirmed that the executor hasn't been unregistered above
task(m_executor.get());
});
}
} }